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This commit is contained in:
Darko Draskovic
2023-03-27 13:44:00 +02:00
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Apache License
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https://www.apache.org/licenses/
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7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
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risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
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work stoppage, computer failure or malfunction, or any and all
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Copyright 2015-2020 Mainflux
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docker_mfxkit:
docker build --no-cache --tag=mainflux/mfxkit -f docker/Dockerfile .
run:
docker-compose -f docker/docker-compose.yml up
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# Mfxkit - Mainflux Starter Kit
Mfxkit service provides a barebones HTTP API and Service interface implementation for development of a core Mainflux service.
## How-to
Copy `mfxkit` directory to the `mainflux` root directory, e.g. `~/go/src/github.com/mainflux/mainflux/`. Copy `cmd/mfxkit` directory to `mainflux/cmd` directory.
In `mainflux` root directory run
```
MF_MFXKIT_LOG_LEVEL=info go run cmd/mfxkit/main.go
```
You should get a message similar to this one
```
{"level":"info","message":"Mfxkit service started using http on port 9021","ts":"2021-03-03T11:16:27.027381203Z"}
```
In the other terminal window run
```
curl -i -X POST -H "Content-Type: application/json" localhost:9021/mfxkit -d '{"secret":"secret"}'
```
If everything goes well, you should get
```
HTTP/1.1 200 OK
Content-Type: application/json
Date: Wed, 03 Mar 2021 11:17:10 GMT
Content-Length: 30
{"greeting":"Hello World :)"}
```
To change the secret or the port, prefix the `go run` command with environment variable assignments, e.g.
```
MF_MFXKIT_LOG_LEVEL=info MF_MFXKIT_SECRET=secret2 MF_MFXKIT_HTTP_PORT=9022 go run cmd/mfxkit/main.go
```
To see the change in action, run
```
curl -i -X POST -H "Content-Type: application/json" localhost:9022/mfxkit -d '{"secret":"secret2"}'
```
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# Agent CLI
## Build
From the project root:
```bash
make cli
```
## Usage
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//
// Copyright (c) 2019
// Mainflux
//
// SPDX-License-Identifier: Apache-2.0
//
package main
import (
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/mainflux/mainflux"
"github.com/mainflux/mainflux/logger"
"github.com/mainflux/mfxkit/mfxkit"
"github.com/mainflux/mfxkit/mfxkit/api"
mfxkithttpapi "github.com/mainflux/mfxkit/mfxkit/api/mfxkit/http"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
opentracing "github.com/opentracing/opentracing-go"
stdprometheus "github.com/prometheus/client_golang/prometheus"
jconfig "github.com/uber/jaeger-client-go/config"
)
const (
defLogLevel = "error"
defHTTPPort = "9021"
defJaegerURL = ""
defServerCert = ""
defServerKey = ""
defSecret = "secret"
envLogLevel = "MF_MFXKIT_LOG_LEVEL"
envHTTPPort = "MF_MFXKIT_HTTP_PORT"
envServerCert = "MF_MFXKIT_SERVER_CERT"
envServerKey = "MF_MFXKIT_SERVER_KEY"
envSecret = "MF_MFXKIT_SECRET"
envJaegerURL = "MF_JAEGER_URL"
)
type config struct {
logLevel string
httpPort string
authHTTPPort string
authGRPCPort string
serverCert string
serverKey string
secret string
jaegerURL string
}
func main() {
cfg := loadConfig()
logger, err := logger.New(os.Stdout, cfg.logLevel)
if err != nil {
log.Fatalf(err.Error())
}
mfxkitTracer, mfxkitCloser := initJaeger("mfxkit", cfg.jaegerURL, logger)
defer mfxkitCloser.Close()
svc := newService(cfg.secret, logger)
errs := make(chan error, 2)
go startHTTPServer(mfxkithttpapi.MakeHandler(mfxkitTracer, svc), cfg.httpPort, cfg, logger, errs)
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT)
errs <- fmt.Errorf("%s", <-c)
}()
err = <-errs
logger.Error(fmt.Sprintf("Mfxkit service terminated: %s", err))
}
func loadConfig() config {
return config{
logLevel: mainflux.Env(envLogLevel, defLogLevel),
httpPort: mainflux.Env(envHTTPPort, defHTTPPort),
serverCert: mainflux.Env(envServerCert, defServerCert),
serverKey: mainflux.Env(envServerKey, defServerKey),
jaegerURL: mainflux.Env(envJaegerURL, defJaegerURL),
secret: mainflux.Env(envSecret, defSecret),
}
}
func initJaeger(svcName, url string, logger logger.Logger) (opentracing.Tracer, io.Closer) {
if url == "" {
return opentracing.NoopTracer{}, ioutil.NopCloser(nil)
}
tracer, closer, err := jconfig.Configuration{
ServiceName: svcName,
Sampler: &jconfig.SamplerConfig{
Type: "const",
Param: 1,
},
Reporter: &jconfig.ReporterConfig{
LocalAgentHostPort: url,
LogSpans: true,
},
}.NewTracer()
if err != nil {
logger.Error(fmt.Sprintf("Failed to init Jaeger client: %s", err))
os.Exit(1)
}
return tracer, closer
}
func newService(secret string, logger logger.Logger) mfxkit.Service {
svc := mfxkit.New(secret)
svc = api.LoggingMiddleware(svc, logger)
svc = api.MetricsMiddleware(
svc,
kitprometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "mfxkit",
Subsystem: "api",
Name: "request_count",
Help: "Number of requests received.",
}, []string{"method"}),
kitprometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "mfxkit",
Subsystem: "api",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, []string{"method"}),
)
return svc
}
func startHTTPServer(handler http.Handler, port string, cfg config, logger logger.Logger, errs chan error) {
p := fmt.Sprintf(":%s", port)
if cfg.serverCert != "" || cfg.serverKey != "" {
logger.Info(fmt.Sprintf("Mfxkit service started using https on port %s with cert %s key %s",
port, cfg.serverCert, cfg.serverKey))
errs <- http.ListenAndServeTLS(p, cfg.serverCert, cfg.serverKey, handler)
return
}
logger.Info(fmt.Sprintf("Mfxkit service started using http on port %s", cfg.httpPort))
errs <- http.ListenAndServe(p, handler)
}
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# Docker: Environment variables in Compose
## Mfxkit
MF_MFXKIT_LOG_LEVEL=debug
MF_MFXKIT_HTTP_PORT=9021
MF_MFXKIT_SECRET=secret
MF_MFXKIT_SERVER_CERT=""
MF_MFXKIT_SERVER_KEY=""
MF_JAEGER_URL="jaeger:6831"
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FROM golang:1.16-alpine AS builder
WORKDIR /go/src/github.com/mainflux/mfxkit
COPY . .
RUN CGO_ENABLED=0 GOARCH=amd64 \
go build -mod=vendor -ldflags "-s -w" -o build/mainflux-mfxkit cmd/mfxkit/main.go \
&& mv build/mainflux-mfxkit /exe
FROM scratch
COPY --from=builder /exe /
ENTRYPOINT ["/exe"]
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###
# Copyright (c) 2015-2017 Mainflux
#
# Mainflux is licensed under an Apache license, version 2.0 license.
# All rights not explicitly granted in the Apache license, version 2.0 are reserved.
# See the included LICENSE file for more details.
###
version: "3.7"
networks:
docker_mainflux-base-net:
external: true
services:
mfxkit:
image: mainflux/mfxkit:latest
container_name: mainflux-mfxkit
restart: on-failure
environment:
MF_MFXKIT_LOG_LEVEL: ${MF_MFXKIT_LOG_LEVEL}
MF_MFXKIT_HTTP_PORT: ${MF_MFXKIT_HTTP_PORT}
MF_MFXKIT_SERVER_CERT: ${MF_MFXKIT_SERVER_CERT}
MF_MFXKIT_SERVER_KEY: ${MF_MFXKIT_SERVER_KEY}
MF_JAEGER_URL: ${MF_JAEGER_URL}
MF_MFXKIT_SECRET: ${MF_MFXKIT_SECRET}
ports:
- ${MF_MFXKIT_HTTP_PORT}:${MF_MFXKIT_HTTP_PORT}
networks:
- docker_mainflux-base-net
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module github.com/mainflux/mfxkit
go 1.16
require (
github.com/go-kit/kit v0.10.0
github.com/go-zoo/bone v1.3.0
github.com/mainflux/mainflux v0.12.0
github.com/opentracing/opentracing-go v1.2.0
github.com/prometheus/client_golang v1.10.0
github.com/uber/jaeger-client-go v2.25.0+incompatible
)
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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
cloud.google.com/go v0.43.0/go.mod h1:BOSR3VbTLkk6FDC/TcffxP4NF/FFBGA5ku+jvKOP7pg=
cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
cloud.google.com/go/bigtable v1.2.0/go.mod h1:JcVAOl45lrTmQfLj7T6TxyMzIN/3FGGcFm+2xVAli2o=
cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
collectd.org v0.3.0/go.mod h1:A/8DzQBkF6abtvrT2j/AU/4tiBgJWYyh0y/oB/4MlWE=
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
github.com/Microsoft/go-winio v0.4.7/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5/go.mod h1:lmUJ/7eu/Q8D7ML55dXQrVaamCz2vxCfdQBasLZfHKk=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
github.com/VividCortex/gohistogram v1.0.0 h1:6+hBz+qvs0JOrrNhhmR7lFxo5sINxBCGXrdtl/UvroE=
github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
github.com/alexbrainman/sspi v0.0.0-20180613141037-e580b900e9f5/go.mod h1:976q2ETgjT2snVCf2ZaBnyBbVoPERGjUz+0sofzEfro=
github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
github.com/apache/arrow/go/arrow v0.0.0-20191024131854-af6fa24be0db/go.mod h1:VTxUBvSJ3s3eHAg65PNgrsn5BtqCRPdmyXh6rAfdxN0=
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github.com/hashicorp/go-multierror v1.0.0/go.mod h1:dHtQlpGsu+cZNNAkkCN/P3hoUDHhCYQXV3UM06sGGrk=
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github.com/hashicorp/go-retryablehttp v0.5.4/go.mod h1:9B5zBasrRhHXnJnui7y6sL7es7NDiJgTc6Er0maI1Xs=
github.com/hashicorp/go-rootcerts v1.0.0/go.mod h1:K6zTfqpRlCUIjkwsN4Z+hiSfzSTQa6eBIzfwKfwNnHU=
github.com/hashicorp/go-rootcerts v1.0.1/go.mod h1:pqUvnprVnM5bf7AOirdbb01K4ccR319Vf4pU3K5EGc8=
github.com/hashicorp/go-sockaddr v1.0.0/go.mod h1:7Xibr9yA9JjQq1JpNB2Vw7kxv8xerXegt+ozgdvDeDU=
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github.com/hashicorp/go-syslog v1.0.0/go.mod h1:qPfqrKkXGihmCqbJM2mZgkZGvKG1dFdvsLplgctolz4=
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github.com/hashicorp/go-version v1.1.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
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google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
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google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
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google.golang.org/grpc v1.30.0 h1:M5a8xTlYTxwMn5ZFkwhRabsygDY5G8TYLyQDBxJNAxE=
google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
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google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
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google.golang.org/protobuf v1.24.0 h1:UhZDfRO8JRQru4/+LlLE0BRKGF8L+PICnvYZmx/fEGA=
google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
gopkg.in/gorp.v1 v1.7.1/go.mod h1:Wo3h+DBQZIxATwftsglhdD/62zRFPhGhTiu5jUJmCaw=
gopkg.in/gorp.v1 v1.7.2/go.mod h1:Wo3h+DBQZIxATwftsglhdD/62zRFPhGhTiu5jUJmCaw=
gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
gopkg.in/jcmturner/aescts.v1 v1.0.1/go.mod h1:nsR8qBOg+OucoIW+WMhB3GspUQXq9XorLnQb9XtvcOo=
gopkg.in/jcmturner/dnsutils.v1 v1.0.1/go.mod h1:m3v+5svpVOhtFAP/wSz+yzh4Mc0Fg7eRhxkJMWSIz9Q=
gopkg.in/jcmturner/goidentity.v3 v3.0.0/go.mod h1:oG2kH0IvSYNIu80dVAyu/yoefjq1mNfM5bm88whjWx4=
gopkg.in/jcmturner/gokrb5.v7 v7.5.0/go.mod h1:l8VISx+WGYp+Fp7KRbsiUuXTTOnxIc3Tuvyavf11/WM=
gopkg.in/jcmturner/rpc.v1 v1.1.0/go.mod h1:YIdkC4XfD6GXbzje11McwsDuOlZQSb9W4vfLvuNnlv8=
gopkg.in/ory-am/dockertest.v3 v3.3.2/go.mod h1:s9mmoLkaGeAh97qygnNj4xWkiN7e1SKekYC6CovU+ek=
gopkg.in/ory/dockertest.v3 v3.3.5/go.mod h1:wI78nwA6jQZVXv3va0CcbJAuftRnAa063zO5Fek7+uI=
gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
gopkg.in/square/go-jose.v2 v2.5.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
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# Mfxkit
Mfxkit service provides a barebones HTTP API and Service interface implementation for development of a core Mainflux service.
## Configuration
The service is configured using the environment variables from the following table. Note that any unset variables will be replaced with their default values.
| Variable | Description | Default |
|-----------------------|---------------------------------------------------------|---------|
| MF_MFXKIT_LOG_LEVEL | Log level for mfxkit service (debug, info, warn, error) | error |
| MF_MFXKIT_HTTP_PORT | Mfxkit service HTTP port | 9021 |
| MF_MFXKIT_SERVER_CERT | Path to server certificate in pem format | |
| MF_MFXKIT_SERVER_KEY | Path to server key in pem format | |
| MF_JAEGER_URL | Jaeger server URL | |
| MF_MFXKIT_SECRET | Mfxkit service secret | secret |
## Deployment
The service is distributed as a Docker container. The following snippet provides a compose file template that can be used to deploy the service container locally:
```yaml
version: "3"
services:
mfxkit:
image: mainflux/mfxkit:[version]
container_name: [instance name]
ports:
- [host machine port]:[configured HTTP port]
environment:
MF_MFXKIT_LOG_LEVEL: [Kit log level]
MF_MFXKIT_HTTP_PORT: [Service HTTP port]
MF_MFXKIT_SERVER_CERT: [String path to server cert in pem format]
MF_MFXKIT_SERVER_KEY: [String path to server key in pem format]
MF_MFXKIT_SECRET: [Mfxkit service secret]
MF_JAEGER_URL: [Jaeger server URL]
```
To start the service outside of the container, execute the following shell script:
```bash
# download the latest version of the service
go get github.com/mainflux/mainflux
cd $GOPATH/src/github.com/mainflux/mainflux
# compile the mfxkit
make mfxkit
# copy binary to bin
make install
# set the environment variables and run the service
MF_MFXKIT_LOG_LEVEL=[Kit log level] MF_MFXKIT_HTTP_PORT=[Service HTTP port] MF_MFXKIT_SERVER_CERT: [String path to server cert in pem format] MF_MFXKIT_SERVER_KEY: [String path to server key in pem format] MF_JAEGER_URL=[Jaeger server URL] MF_MFXKIT_SECRET: [Mfxkit service secret] $GOBIN/mainflux-kit
```
## Usage
For more information about service capabilities and its usage, please check out the [API documentation](swagger.yaml).
[doc]: http://mainflux.readthedocs.io
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
// Package api contains API-related concerns: endpoint definitions, middlewares
// and all resource representations.
package api
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
// +build !test
package api
import (
"fmt"
"time"
log "github.com/mainflux/mainflux/logger"
"github.com/mainflux/mfxkit/mfxkit"
)
var _ mfxkit.Service = (*loggingMiddleware)(nil)
type loggingMiddleware struct {
logger log.Logger
svc mfxkit.Service
}
// LoggingMiddleware adds logging facilities to the core service.
func LoggingMiddleware(svc mfxkit.Service, logger log.Logger) mfxkit.Service {
return &loggingMiddleware{logger, svc}
}
func (lm *loggingMiddleware) Ping(secret string) (response string, err error) {
defer func(begin time.Time) {
message := fmt.Sprintf("Method ping for secret %s took %s to complete", secret, time.Since(begin))
if err != nil {
lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
return
}
lm.logger.Info(fmt.Sprintf("%s without errors.", message))
}(time.Now())
return lm.svc.Ping(secret)
}
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
// +build !test
package api
import (
"time"
"github.com/go-kit/kit/metrics"
"github.com/mainflux/mfxkit/mfxkit"
)
var _ mfxkit.Service = (*metricsMiddleware)(nil)
type metricsMiddleware struct {
counter metrics.Counter
latency metrics.Histogram
svc mfxkit.Service
}
// MetricsMiddleware instruments core service by tracking request count and
// latency.
func MetricsMiddleware(svc mfxkit.Service, counter metrics.Counter, latency metrics.Histogram) mfxkit.Service {
return &metricsMiddleware{
counter: counter,
latency: latency,
svc: svc,
}
}
func (ms *metricsMiddleware) Ping(secret string) (response string, err error) {
defer func(begin time.Time) {
ms.counter.With("method", "ping").Add(1)
ms.latency.With("method", "ping").Observe(time.Since(begin).Seconds())
}(time.Now())
return ms.svc.Ping(secret)
}
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
// Package http contains implementation of kit service HTTP API.
package http
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package http
import (
"context"
"github.com/go-kit/kit/endpoint"
"github.com/mainflux/mfxkit/mfxkit"
)
func pingEndpoint(svc mfxkit.Service) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (interface{}, error) {
req := request.(pingReq)
if err := req.validate(); err != nil {
return nil, err
}
greeting, err := svc.Ping(req.Secret)
if err != nil {
return nil, err
}
res := pingRes{
Greeting: greeting,
}
return res, nil
}
}
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package http
import "github.com/mainflux/mfxkit/mfxkit"
type apiReq interface {
validate() error
}
type pingReq struct {
Secret string `json:"secret"`
}
func (req pingReq) validate() error {
if req.Secret == "" {
return mfxkit.ErrMalformedEntity
}
return nil
}
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package http
import (
"net/http"
"github.com/mainflux/mainflux"
)
var _ mainflux.Response = (*pingRes)(nil)
type pingRes struct {
Greeting string `json:"greeting"`
}
func (res pingRes) Code() int {
return http.StatusOK
}
func (res pingRes) Headers() map[string]string {
return map[string]string{}
}
func (res pingRes) Empty() bool {
return false
}
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package http
import (
"context"
"encoding/json"
"errors"
"io"
"net/http"
"strconv"
"strings"
kitot "github.com/go-kit/kit/tracing/opentracing"
kithttp "github.com/go-kit/kit/transport/http"
"github.com/go-zoo/bone"
"github.com/mainflux/mainflux"
"github.com/mainflux/mfxkit/mfxkit"
opentracing "github.com/opentracing/opentracing-go"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const (
contentType = "application/json"
)
var (
errUnsupportedContentType = errors.New("unsupported content type")
errInvalidQueryParams = errors.New("invalid query params")
)
// MakeHandler returns a HTTP handler for API endpoints.
func MakeHandler(tracer opentracing.Tracer, svc mfxkit.Service) http.Handler {
opts := []kithttp.ServerOption{
kithttp.ServerErrorEncoder(encodeError),
}
r := bone.New()
r.Post("/mfxkit", kithttp.NewServer(
kitot.TraceServer(tracer, "ping")(pingEndpoint(svc)),
decodePing,
encodeResponse,
opts...,
))
r.GetFunc("/version", mainflux.Version("things"))
r.Handle("/metrics", promhttp.Handler())
return r
}
func decodePing(_ context.Context, r *http.Request) (interface{}, error) {
if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
return nil, errUnsupportedContentType
}
req := pingReq{}
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
return nil, err
}
return req, nil
}
func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
w.Header().Set("Content-Type", contentType)
if ar, ok := response.(mainflux.Response); ok {
for k, v := range ar.Headers() {
w.Header().Set(k, v)
}
w.WriteHeader(ar.Code())
if ar.Empty() {
return nil
}
}
return json.NewEncoder(w).Encode(response)
}
func encodeError(_ context.Context, err error, w http.ResponseWriter) {
w.Header().Set("Content-Type", contentType)
switch err {
case mfxkit.ErrMalformedEntity:
w.WriteHeader(http.StatusBadRequest)
case mfxkit.ErrUnauthorizedAccess:
w.WriteHeader(http.StatusForbidden)
case errUnsupportedContentType:
w.WriteHeader(http.StatusUnsupportedMediaType)
case errInvalidQueryParams:
w.WriteHeader(http.StatusBadRequest)
case io.ErrUnexpectedEOF:
w.WriteHeader(http.StatusBadRequest)
case io.EOF:
w.WriteHeader(http.StatusBadRequest)
default:
switch err.(type) {
case *json.SyntaxError:
w.WriteHeader(http.StatusBadRequest)
case *json.UnmarshalTypeError:
w.WriteHeader(http.StatusBadRequest)
default:
w.WriteHeader(http.StatusInternalServerError)
}
}
}
func readUintQuery(r *http.Request, key string, def uint64) (uint64, error) {
vals := bone.GetQuery(r, key)
if len(vals) > 1 {
return 0, errInvalidQueryParams
}
if len(vals) == 0 {
return def, nil
}
strval := vals[0]
val, err := strconv.ParseUint(strval, 10, 64)
if err != nil {
return 0, errInvalidQueryParams
}
return val, nil
}
func readStringQuery(r *http.Request, key string) (string, error) {
vals := bone.GetQuery(r, key)
if len(vals) > 1 {
return "", errInvalidQueryParams
}
if len(vals) == 0 {
return "", nil
}
return vals[0], nil
}
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
// Package things contains the domain concept definitions needed to support
// Mainflux mfxkit service functionality.
package mfxkit
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package mfxkit
import (
"errors"
)
var (
// ErrMalformedEntity indicates malformed entity specification (e.g.
// invalid username or password).
ErrMalformedEntity = errors.New("malformed entity specification")
// ErrUnauthorizedAccess indicates missing or invalid credentials provided
// when accessing a protected resource.
ErrUnauthorizedAccess = errors.New("missing or invalid credentials provided")
)
// Service specifies an API that must be fullfiled by the domain service
// implementation, and all of its decorators (e.g. logging & metrics).
type Service interface {
// Ping compares a given string with secret
Ping(string) (string, error)
}
type mfxkitService struct {
secret string
}
var _ Service = (*mfxkitService)(nil)
// New instantiates the mfxkit service implementation.
func New(secret string) Service {
return &mfxkitService{
secret: secret,
}
}
func (ks *mfxkitService) Ping(secret string) (string, error) {
if ks.secret != secret {
return "", ErrUnauthorizedAccess
}
return "Hello World :)", nil
}
+20
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@@ -0,0 +1,20 @@
Copyright (C) 2013 Blake Mizerany
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
File diff suppressed because it is too large Load Diff
+316
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@@ -0,0 +1,316 @@
// Package quantile computes approximate quantiles over an unbounded data
// stream within low memory and CPU bounds.
//
// A small amount of accuracy is traded to achieve the above properties.
//
// Multiple streams can be merged before calling Query to generate a single set
// of results. This is meaningful when the streams represent the same type of
// data. See Merge and Samples.
//
// For more detailed information about the algorithm used, see:
//
// Effective Computation of Biased Quantiles over Data Streams
//
// http://www.cs.rutgers.edu/~muthu/bquant.pdf
package quantile
import (
"math"
"sort"
)
// Sample holds an observed value and meta information for compression. JSON
// tags have been added for convenience.
type Sample struct {
Value float64 `json:",string"`
Width float64 `json:",string"`
Delta float64 `json:",string"`
}
// Samples represents a slice of samples. It implements sort.Interface.
type Samples []Sample
func (a Samples) Len() int { return len(a) }
func (a Samples) Less(i, j int) bool { return a[i].Value < a[j].Value }
func (a Samples) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
type invariant func(s *stream, r float64) float64
// NewLowBiased returns an initialized Stream for low-biased quantiles
// (e.g. 0.01, 0.1, 0.5) where the needed quantiles are not known a priori, but
// error guarantees can still be given even for the lower ranks of the data
// distribution.
//
// The provided epsilon is a relative error, i.e. the true quantile of a value
// returned by a query is guaranteed to be within (1±Epsilon)*Quantile.
//
// See http://www.cs.rutgers.edu/~muthu/bquant.pdf for time, space, and error
// properties.
func NewLowBiased(epsilon float64) *Stream {
ƒ := func(s *stream, r float64) float64 {
return 2 * epsilon * r
}
return newStream(ƒ)
}
// NewHighBiased returns an initialized Stream for high-biased quantiles
// (e.g. 0.01, 0.1, 0.5) where the needed quantiles are not known a priori, but
// error guarantees can still be given even for the higher ranks of the data
// distribution.
//
// The provided epsilon is a relative error, i.e. the true quantile of a value
// returned by a query is guaranteed to be within 1-(1±Epsilon)*(1-Quantile).
//
// See http://www.cs.rutgers.edu/~muthu/bquant.pdf for time, space, and error
// properties.
func NewHighBiased(epsilon float64) *Stream {
ƒ := func(s *stream, r float64) float64 {
return 2 * epsilon * (s.n - r)
}
return newStream(ƒ)
}
// NewTargeted returns an initialized Stream concerned with a particular set of
// quantile values that are supplied a priori. Knowing these a priori reduces
// space and computation time. The targets map maps the desired quantiles to
// their absolute errors, i.e. the true quantile of a value returned by a query
// is guaranteed to be within (Quantile±Epsilon).
//
// See http://www.cs.rutgers.edu/~muthu/bquant.pdf for time, space, and error properties.
func NewTargeted(targetMap map[float64]float64) *Stream {
// Convert map to slice to avoid slow iterations on a map.
// ƒ is called on the hot path, so converting the map to a slice
// beforehand results in significant CPU savings.
targets := targetMapToSlice(targetMap)
ƒ := func(s *stream, r float64) float64 {
var m = math.MaxFloat64
var f float64
for _, t := range targets {
if t.quantile*s.n <= r {
f = (2 * t.epsilon * r) / t.quantile
} else {
f = (2 * t.epsilon * (s.n - r)) / (1 - t.quantile)
}
if f < m {
m = f
}
}
return m
}
return newStream(ƒ)
}
type target struct {
quantile float64
epsilon float64
}
func targetMapToSlice(targetMap map[float64]float64) []target {
targets := make([]target, 0, len(targetMap))
for quantile, epsilon := range targetMap {
t := target{
quantile: quantile,
epsilon: epsilon,
}
targets = append(targets, t)
}
return targets
}
// Stream computes quantiles for a stream of float64s. It is not thread-safe by
// design. Take care when using across multiple goroutines.
type Stream struct {
*stream
b Samples
sorted bool
}
func newStream(ƒ invariant) *Stream {
x := &stream{ƒ: ƒ}
return &Stream{x, make(Samples, 0, 500), true}
}
// Insert inserts v into the stream.
func (s *Stream) Insert(v float64) {
s.insert(Sample{Value: v, Width: 1})
}
func (s *Stream) insert(sample Sample) {
s.b = append(s.b, sample)
s.sorted = false
if len(s.b) == cap(s.b) {
s.flush()
}
}
// Query returns the computed qth percentiles value. If s was created with
// NewTargeted, and q is not in the set of quantiles provided a priori, Query
// will return an unspecified result.
func (s *Stream) Query(q float64) float64 {
if !s.flushed() {
// Fast path when there hasn't been enough data for a flush;
// this also yields better accuracy for small sets of data.
l := len(s.b)
if l == 0 {
return 0
}
i := int(math.Ceil(float64(l) * q))
if i > 0 {
i -= 1
}
s.maybeSort()
return s.b[i].Value
}
s.flush()
return s.stream.query(q)
}
// Merge merges samples into the underlying streams samples. This is handy when
// merging multiple streams from separate threads, database shards, etc.
//
// ATTENTION: This method is broken and does not yield correct results. The
// underlying algorithm is not capable of merging streams correctly.
func (s *Stream) Merge(samples Samples) {
sort.Sort(samples)
s.stream.merge(samples)
}
// Reset reinitializes and clears the list reusing the samples buffer memory.
func (s *Stream) Reset() {
s.stream.reset()
s.b = s.b[:0]
}
// Samples returns stream samples held by s.
func (s *Stream) Samples() Samples {
if !s.flushed() {
return s.b
}
s.flush()
return s.stream.samples()
}
// Count returns the total number of samples observed in the stream
// since initialization.
func (s *Stream) Count() int {
return len(s.b) + s.stream.count()
}
func (s *Stream) flush() {
s.maybeSort()
s.stream.merge(s.b)
s.b = s.b[:0]
}
func (s *Stream) maybeSort() {
if !s.sorted {
s.sorted = true
sort.Sort(s.b)
}
}
func (s *Stream) flushed() bool {
return len(s.stream.l) > 0
}
type stream struct {
n float64
l []Sample
ƒ invariant
}
func (s *stream) reset() {
s.l = s.l[:0]
s.n = 0
}
func (s *stream) insert(v float64) {
s.merge(Samples{{v, 1, 0}})
}
func (s *stream) merge(samples Samples) {
// TODO(beorn7): This tries to merge not only individual samples, but
// whole summaries. The paper doesn't mention merging summaries at
// all. Unittests show that the merging is inaccurate. Find out how to
// do merges properly.
var r float64
i := 0
for _, sample := range samples {
for ; i < len(s.l); i++ {
c := s.l[i]
if c.Value > sample.Value {
// Insert at position i.
s.l = append(s.l, Sample{})
copy(s.l[i+1:], s.l[i:])
s.l[i] = Sample{
sample.Value,
sample.Width,
math.Max(sample.Delta, math.Floor(s.ƒ(s, r))-1),
// TODO(beorn7): How to calculate delta correctly?
}
i++
goto inserted
}
r += c.Width
}
s.l = append(s.l, Sample{sample.Value, sample.Width, 0})
i++
inserted:
s.n += sample.Width
r += sample.Width
}
s.compress()
}
func (s *stream) count() int {
return int(s.n)
}
func (s *stream) query(q float64) float64 {
t := math.Ceil(q * s.n)
t += math.Ceil(s.ƒ(s, t) / 2)
p := s.l[0]
var r float64
for _, c := range s.l[1:] {
r += p.Width
if r+c.Width+c.Delta > t {
return p.Value
}
p = c
}
return p.Value
}
func (s *stream) compress() {
if len(s.l) < 2 {
return
}
x := s.l[len(s.l)-1]
xi := len(s.l) - 1
r := s.n - 1 - x.Width
for i := len(s.l) - 2; i >= 0; i-- {
c := s.l[i]
if c.Width+x.Width+x.Delta <= s.ƒ(s, r) {
x.Width += c.Width
s.l[xi] = x
// Remove element at i.
copy(s.l[i:], s.l[i+1:])
s.l = s.l[:len(s.l)-1]
xi -= 1
} else {
x = c
xi = i
}
r -= c.Width
}
}
func (s *stream) samples() Samples {
samples := make(Samples, len(s.l))
copy(samples, s.l)
return samples
}
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language: go
go:
- "1.x"
- master
env:
- TAGS=""
- TAGS="-tags purego"
script: go test $TAGS -v ./...
+22
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Copyright (c) 2016 Caleb Spare
MIT License
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+67
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# xxhash
[![GoDoc](https://godoc.org/github.com/cespare/xxhash?status.svg)](https://godoc.org/github.com/cespare/xxhash)
[![Build Status](https://travis-ci.org/cespare/xxhash.svg?branch=master)](https://travis-ci.org/cespare/xxhash)
xxhash is a Go implementation of the 64-bit
[xxHash](http://cyan4973.github.io/xxHash/) algorithm, XXH64. This is a
high-quality hashing algorithm that is much faster than anything in the Go
standard library.
This package provides a straightforward API:
```
func Sum64(b []byte) uint64
func Sum64String(s string) uint64
type Digest struct{ ... }
func New() *Digest
```
The `Digest` type implements hash.Hash64. Its key methods are:
```
func (*Digest) Write([]byte) (int, error)
func (*Digest) WriteString(string) (int, error)
func (*Digest) Sum64() uint64
```
This implementation provides a fast pure-Go implementation and an even faster
assembly implementation for amd64.
## Compatibility
This package is in a module and the latest code is in version 2 of the module.
You need a version of Go with at least "minimal module compatibility" to use
github.com/cespare/xxhash/v2:
* 1.9.7+ for Go 1.9
* 1.10.3+ for Go 1.10
* Go 1.11 or later
I recommend using the latest release of Go.
## Benchmarks
Here are some quick benchmarks comparing the pure-Go and assembly
implementations of Sum64.
| input size | purego | asm |
| --- | --- | --- |
| 5 B | 979.66 MB/s | 1291.17 MB/s |
| 100 B | 7475.26 MB/s | 7973.40 MB/s |
| 4 KB | 17573.46 MB/s | 17602.65 MB/s |
| 10 MB | 17131.46 MB/s | 17142.16 MB/s |
These numbers were generated on Ubuntu 18.04 with an Intel i7-8700K CPU using
the following commands under Go 1.11.2:
```
$ go test -tags purego -benchtime 10s -bench '/xxhash,direct,bytes'
$ go test -benchtime 10s -bench '/xxhash,direct,bytes'
```
## Projects using this package
- [InfluxDB](https://github.com/influxdata/influxdb)
- [Prometheus](https://github.com/prometheus/prometheus)
- [FreeCache](https://github.com/coocood/freecache)
+3
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module github.com/cespare/xxhash/v2
go 1.11
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// Package xxhash implements the 64-bit variant of xxHash (XXH64) as described
// at http://cyan4973.github.io/xxHash/.
package xxhash
import (
"encoding/binary"
"errors"
"math/bits"
)
const (
prime1 uint64 = 11400714785074694791
prime2 uint64 = 14029467366897019727
prime3 uint64 = 1609587929392839161
prime4 uint64 = 9650029242287828579
prime5 uint64 = 2870177450012600261
)
// NOTE(caleb): I'm using both consts and vars of the primes. Using consts where
// possible in the Go code is worth a small (but measurable) performance boost
// by avoiding some MOVQs. Vars are needed for the asm and also are useful for
// convenience in the Go code in a few places where we need to intentionally
// avoid constant arithmetic (e.g., v1 := prime1 + prime2 fails because the
// result overflows a uint64).
var (
prime1v = prime1
prime2v = prime2
prime3v = prime3
prime4v = prime4
prime5v = prime5
)
// Digest implements hash.Hash64.
type Digest struct {
v1 uint64
v2 uint64
v3 uint64
v4 uint64
total uint64
mem [32]byte
n int // how much of mem is used
}
// New creates a new Digest that computes the 64-bit xxHash algorithm.
func New() *Digest {
var d Digest
d.Reset()
return &d
}
// Reset clears the Digest's state so that it can be reused.
func (d *Digest) Reset() {
d.v1 = prime1v + prime2
d.v2 = prime2
d.v3 = 0
d.v4 = -prime1v
d.total = 0
d.n = 0
}
// Size always returns 8 bytes.
func (d *Digest) Size() int { return 8 }
// BlockSize always returns 32 bytes.
func (d *Digest) BlockSize() int { return 32 }
// Write adds more data to d. It always returns len(b), nil.
func (d *Digest) Write(b []byte) (n int, err error) {
n = len(b)
d.total += uint64(n)
if d.n+n < 32 {
// This new data doesn't even fill the current block.
copy(d.mem[d.n:], b)
d.n += n
return
}
if d.n > 0 {
// Finish off the partial block.
copy(d.mem[d.n:], b)
d.v1 = round(d.v1, u64(d.mem[0:8]))
d.v2 = round(d.v2, u64(d.mem[8:16]))
d.v3 = round(d.v3, u64(d.mem[16:24]))
d.v4 = round(d.v4, u64(d.mem[24:32]))
b = b[32-d.n:]
d.n = 0
}
if len(b) >= 32 {
// One or more full blocks left.
nw := writeBlocks(d, b)
b = b[nw:]
}
// Store any remaining partial block.
copy(d.mem[:], b)
d.n = len(b)
return
}
// Sum appends the current hash to b and returns the resulting slice.
func (d *Digest) Sum(b []byte) []byte {
s := d.Sum64()
return append(
b,
byte(s>>56),
byte(s>>48),
byte(s>>40),
byte(s>>32),
byte(s>>24),
byte(s>>16),
byte(s>>8),
byte(s),
)
}
// Sum64 returns the current hash.
func (d *Digest) Sum64() uint64 {
var h uint64
if d.total >= 32 {
v1, v2, v3, v4 := d.v1, d.v2, d.v3, d.v4
h = rol1(v1) + rol7(v2) + rol12(v3) + rol18(v4)
h = mergeRound(h, v1)
h = mergeRound(h, v2)
h = mergeRound(h, v3)
h = mergeRound(h, v4)
} else {
h = d.v3 + prime5
}
h += d.total
i, end := 0, d.n
for ; i+8 <= end; i += 8 {
k1 := round(0, u64(d.mem[i:i+8]))
h ^= k1
h = rol27(h)*prime1 + prime4
}
if i+4 <= end {
h ^= uint64(u32(d.mem[i:i+4])) * prime1
h = rol23(h)*prime2 + prime3
i += 4
}
for i < end {
h ^= uint64(d.mem[i]) * prime5
h = rol11(h) * prime1
i++
}
h ^= h >> 33
h *= prime2
h ^= h >> 29
h *= prime3
h ^= h >> 32
return h
}
const (
magic = "xxh\x06"
marshaledSize = len(magic) + 8*5 + 32
)
// MarshalBinary implements the encoding.BinaryMarshaler interface.
func (d *Digest) MarshalBinary() ([]byte, error) {
b := make([]byte, 0, marshaledSize)
b = append(b, magic...)
b = appendUint64(b, d.v1)
b = appendUint64(b, d.v2)
b = appendUint64(b, d.v3)
b = appendUint64(b, d.v4)
b = appendUint64(b, d.total)
b = append(b, d.mem[:d.n]...)
b = b[:len(b)+len(d.mem)-d.n]
return b, nil
}
// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
func (d *Digest) UnmarshalBinary(b []byte) error {
if len(b) < len(magic) || string(b[:len(magic)]) != magic {
return errors.New("xxhash: invalid hash state identifier")
}
if len(b) != marshaledSize {
return errors.New("xxhash: invalid hash state size")
}
b = b[len(magic):]
b, d.v1 = consumeUint64(b)
b, d.v2 = consumeUint64(b)
b, d.v3 = consumeUint64(b)
b, d.v4 = consumeUint64(b)
b, d.total = consumeUint64(b)
copy(d.mem[:], b)
b = b[len(d.mem):]
d.n = int(d.total % uint64(len(d.mem)))
return nil
}
func appendUint64(b []byte, x uint64) []byte {
var a [8]byte
binary.LittleEndian.PutUint64(a[:], x)
return append(b, a[:]...)
}
func consumeUint64(b []byte) ([]byte, uint64) {
x := u64(b)
return b[8:], x
}
func u64(b []byte) uint64 { return binary.LittleEndian.Uint64(b) }
func u32(b []byte) uint32 { return binary.LittleEndian.Uint32(b) }
func round(acc, input uint64) uint64 {
acc += input * prime2
acc = rol31(acc)
acc *= prime1
return acc
}
func mergeRound(acc, val uint64) uint64 {
val = round(0, val)
acc ^= val
acc = acc*prime1 + prime4
return acc
}
func rol1(x uint64) uint64 { return bits.RotateLeft64(x, 1) }
func rol7(x uint64) uint64 { return bits.RotateLeft64(x, 7) }
func rol11(x uint64) uint64 { return bits.RotateLeft64(x, 11) }
func rol12(x uint64) uint64 { return bits.RotateLeft64(x, 12) }
func rol18(x uint64) uint64 { return bits.RotateLeft64(x, 18) }
func rol23(x uint64) uint64 { return bits.RotateLeft64(x, 23) }
func rol27(x uint64) uint64 { return bits.RotateLeft64(x, 27) }
func rol31(x uint64) uint64 { return bits.RotateLeft64(x, 31) }
+13
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@@ -0,0 +1,13 @@
// +build !appengine
// +build gc
// +build !purego
package xxhash
// Sum64 computes the 64-bit xxHash digest of b.
//
//go:noescape
func Sum64(b []byte) uint64
//go:noescape
func writeBlocks(d *Digest, b []byte) int
+215
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// +build !appengine
// +build gc
// +build !purego
#include "textflag.h"
// Register allocation:
// AX h
// CX pointer to advance through b
// DX n
// BX loop end
// R8 v1, k1
// R9 v2
// R10 v3
// R11 v4
// R12 tmp
// R13 prime1v
// R14 prime2v
// R15 prime4v
// round reads from and advances the buffer pointer in CX.
// It assumes that R13 has prime1v and R14 has prime2v.
#define round(r) \
MOVQ (CX), R12 \
ADDQ $8, CX \
IMULQ R14, R12 \
ADDQ R12, r \
ROLQ $31, r \
IMULQ R13, r
// mergeRound applies a merge round on the two registers acc and val.
// It assumes that R13 has prime1v, R14 has prime2v, and R15 has prime4v.
#define mergeRound(acc, val) \
IMULQ R14, val \
ROLQ $31, val \
IMULQ R13, val \
XORQ val, acc \
IMULQ R13, acc \
ADDQ R15, acc
// func Sum64(b []byte) uint64
TEXT ·Sum64(SB), NOSPLIT, $0-32
// Load fixed primes.
MOVQ ·prime1v(SB), R13
MOVQ ·prime2v(SB), R14
MOVQ ·prime4v(SB), R15
// Load slice.
MOVQ b_base+0(FP), CX
MOVQ b_len+8(FP), DX
LEAQ (CX)(DX*1), BX
// The first loop limit will be len(b)-32.
SUBQ $32, BX
// Check whether we have at least one block.
CMPQ DX, $32
JLT noBlocks
// Set up initial state (v1, v2, v3, v4).
MOVQ R13, R8
ADDQ R14, R8
MOVQ R14, R9
XORQ R10, R10
XORQ R11, R11
SUBQ R13, R11
// Loop until CX > BX.
blockLoop:
round(R8)
round(R9)
round(R10)
round(R11)
CMPQ CX, BX
JLE blockLoop
MOVQ R8, AX
ROLQ $1, AX
MOVQ R9, R12
ROLQ $7, R12
ADDQ R12, AX
MOVQ R10, R12
ROLQ $12, R12
ADDQ R12, AX
MOVQ R11, R12
ROLQ $18, R12
ADDQ R12, AX
mergeRound(AX, R8)
mergeRound(AX, R9)
mergeRound(AX, R10)
mergeRound(AX, R11)
JMP afterBlocks
noBlocks:
MOVQ ·prime5v(SB), AX
afterBlocks:
ADDQ DX, AX
// Right now BX has len(b)-32, and we want to loop until CX > len(b)-8.
ADDQ $24, BX
CMPQ CX, BX
JG fourByte
wordLoop:
// Calculate k1.
MOVQ (CX), R8
ADDQ $8, CX
IMULQ R14, R8
ROLQ $31, R8
IMULQ R13, R8
XORQ R8, AX
ROLQ $27, AX
IMULQ R13, AX
ADDQ R15, AX
CMPQ CX, BX
JLE wordLoop
fourByte:
ADDQ $4, BX
CMPQ CX, BX
JG singles
MOVL (CX), R8
ADDQ $4, CX
IMULQ R13, R8
XORQ R8, AX
ROLQ $23, AX
IMULQ R14, AX
ADDQ ·prime3v(SB), AX
singles:
ADDQ $4, BX
CMPQ CX, BX
JGE finalize
singlesLoop:
MOVBQZX (CX), R12
ADDQ $1, CX
IMULQ ·prime5v(SB), R12
XORQ R12, AX
ROLQ $11, AX
IMULQ R13, AX
CMPQ CX, BX
JL singlesLoop
finalize:
MOVQ AX, R12
SHRQ $33, R12
XORQ R12, AX
IMULQ R14, AX
MOVQ AX, R12
SHRQ $29, R12
XORQ R12, AX
IMULQ ·prime3v(SB), AX
MOVQ AX, R12
SHRQ $32, R12
XORQ R12, AX
MOVQ AX, ret+24(FP)
RET
// writeBlocks uses the same registers as above except that it uses AX to store
// the d pointer.
// func writeBlocks(d *Digest, b []byte) int
TEXT ·writeBlocks(SB), NOSPLIT, $0-40
// Load fixed primes needed for round.
MOVQ ·prime1v(SB), R13
MOVQ ·prime2v(SB), R14
// Load slice.
MOVQ b_base+8(FP), CX
MOVQ b_len+16(FP), DX
LEAQ (CX)(DX*1), BX
SUBQ $32, BX
// Load vN from d.
MOVQ d+0(FP), AX
MOVQ 0(AX), R8 // v1
MOVQ 8(AX), R9 // v2
MOVQ 16(AX), R10 // v3
MOVQ 24(AX), R11 // v4
// We don't need to check the loop condition here; this function is
// always called with at least one block of data to process.
blockLoop:
round(R8)
round(R9)
round(R10)
round(R11)
CMPQ CX, BX
JLE blockLoop
// Copy vN back to d.
MOVQ R8, 0(AX)
MOVQ R9, 8(AX)
MOVQ R10, 16(AX)
MOVQ R11, 24(AX)
// The number of bytes written is CX minus the old base pointer.
SUBQ b_base+8(FP), CX
MOVQ CX, ret+32(FP)
RET
+76
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// +build !amd64 appengine !gc purego
package xxhash
// Sum64 computes the 64-bit xxHash digest of b.
func Sum64(b []byte) uint64 {
// A simpler version would be
// d := New()
// d.Write(b)
// return d.Sum64()
// but this is faster, particularly for small inputs.
n := len(b)
var h uint64
if n >= 32 {
v1 := prime1v + prime2
v2 := prime2
v3 := uint64(0)
v4 := -prime1v
for len(b) >= 32 {
v1 = round(v1, u64(b[0:8:len(b)]))
v2 = round(v2, u64(b[8:16:len(b)]))
v3 = round(v3, u64(b[16:24:len(b)]))
v4 = round(v4, u64(b[24:32:len(b)]))
b = b[32:len(b):len(b)]
}
h = rol1(v1) + rol7(v2) + rol12(v3) + rol18(v4)
h = mergeRound(h, v1)
h = mergeRound(h, v2)
h = mergeRound(h, v3)
h = mergeRound(h, v4)
} else {
h = prime5
}
h += uint64(n)
i, end := 0, len(b)
for ; i+8 <= end; i += 8 {
k1 := round(0, u64(b[i:i+8:len(b)]))
h ^= k1
h = rol27(h)*prime1 + prime4
}
if i+4 <= end {
h ^= uint64(u32(b[i:i+4:len(b)])) * prime1
h = rol23(h)*prime2 + prime3
i += 4
}
for ; i < end; i++ {
h ^= uint64(b[i]) * prime5
h = rol11(h) * prime1
}
h ^= h >> 33
h *= prime2
h ^= h >> 29
h *= prime3
h ^= h >> 32
return h
}
func writeBlocks(d *Digest, b []byte) int {
v1, v2, v3, v4 := d.v1, d.v2, d.v3, d.v4
n := len(b)
for len(b) >= 32 {
v1 = round(v1, u64(b[0:8:len(b)]))
v2 = round(v2, u64(b[8:16:len(b)]))
v3 = round(v3, u64(b[16:24:len(b)]))
v4 = round(v4, u64(b[24:32:len(b)]))
b = b[32:len(b):len(b)]
}
d.v1, d.v2, d.v3, d.v4 = v1, v2, v3, v4
return n - len(b)
}
+15
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// +build appengine
// This file contains the safe implementations of otherwise unsafe-using code.
package xxhash
// Sum64String computes the 64-bit xxHash digest of s.
func Sum64String(s string) uint64 {
return Sum64([]byte(s))
}
// WriteString adds more data to d. It always returns len(s), nil.
func (d *Digest) WriteString(s string) (n int, err error) {
return d.Write([]byte(s))
}
+46
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// +build !appengine
// This file encapsulates usage of unsafe.
// xxhash_safe.go contains the safe implementations.
package xxhash
import (
"reflect"
"unsafe"
)
// Notes:
//
// See https://groups.google.com/d/msg/golang-nuts/dcjzJy-bSpw/tcZYBzQqAQAJ
// for some discussion about these unsafe conversions.
//
// In the future it's possible that compiler optimizations will make these
// unsafe operations unnecessary: https://golang.org/issue/2205.
//
// Both of these wrapper functions still incur function call overhead since they
// will not be inlined. We could write Go/asm copies of Sum64 and Digest.Write
// for strings to squeeze out a bit more speed. Mid-stack inlining should
// eventually fix this.
// Sum64String computes the 64-bit xxHash digest of s.
// It may be faster than Sum64([]byte(s)) by avoiding a copy.
func Sum64String(s string) uint64 {
var b []byte
bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
bh.Data = (*reflect.StringHeader)(unsafe.Pointer(&s)).Data
bh.Len = len(s)
bh.Cap = len(s)
return Sum64(b)
}
// WriteString adds more data to d. It always returns len(s), nil.
// It may be faster than Write([]byte(s)) by avoiding a copy.
func (d *Digest) WriteString(s string) (n int, err error) {
var b []byte
bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
bh.Data = (*reflect.StringHeader)(unsafe.Pointer(&s)).Data
bh.Len = len(s)
bh.Cap = len(s)
return d.Write(b)
}
+22
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The MIT License (MIT)
Copyright (c) 2015 Peter Bourgon
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
+5
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// Package endpoint defines an abstraction for RPCs.
//
// Endpoints are a fundamental building block for many Go kit components.
// Endpoints are implemented by servers, and called by clients.
package endpoint
+40
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package endpoint
import (
"context"
)
// Endpoint is the fundamental building block of servers and clients.
// It represents a single RPC method.
type Endpoint func(ctx context.Context, request interface{}) (response interface{}, err error)
// Nop is an endpoint that does nothing and returns a nil error.
// Useful for tests.
func Nop(context.Context, interface{}) (interface{}, error) { return struct{}{}, nil }
// Middleware is a chainable behavior modifier for endpoints.
type Middleware func(Endpoint) Endpoint
// Chain is a helper function for composing middlewares. Requests will
// traverse them in the order they're declared. That is, the first middleware
// is treated as the outermost middleware.
func Chain(outer Middleware, others ...Middleware) Middleware {
return func(next Endpoint) Endpoint {
for i := len(others) - 1; i >= 0; i-- { // reverse
next = others[i](next)
}
return outer(next)
}
}
// Failer may be implemented by Go kit response types that contain business
// logic error details. If Failed returns a non-nil error, the Go kit transport
// layer may interpret this as a business logic error, and may encode it
// differently than a regular, successful response.
//
// It's not necessary for your response types to implement Failer, but it may
// help for more sophisticated use cases. The addsvc example shows how Failer
// should be used by a complete application.
type Failer interface {
Failed() error
}
+151
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# package log
`package log` provides a minimal interface for structured logging in services.
It may be wrapped to encode conventions, enforce type-safety, provide leveled
logging, and so on. It can be used for both typical application log events,
and log-structured data streams.
## Structured logging
Structured logging is, basically, conceding to the reality that logs are
_data_, and warrant some level of schematic rigor. Using a stricter,
key/value-oriented message format for our logs, containing contextual and
semantic information, makes it much easier to get insight into the
operational activity of the systems we build. Consequently, `package log` is
of the strong belief that "[the benefits of structured logging outweigh the
minimal effort involved](https://www.thoughtworks.com/radar/techniques/structured-logging)".
Migrating from unstructured to structured logging is probably a lot easier
than you'd expect.
```go
// Unstructured
log.Printf("HTTP server listening on %s", addr)
// Structured
logger.Log("transport", "HTTP", "addr", addr, "msg", "listening")
```
## Usage
### Typical application logging
```go
w := log.NewSyncWriter(os.Stderr)
logger := log.NewLogfmtLogger(w)
logger.Log("question", "what is the meaning of life?", "answer", 42)
// Output:
// question="what is the meaning of life?" answer=42
```
### Contextual Loggers
```go
func main() {
var logger log.Logger
logger = log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
logger = log.With(logger, "instance_id", 123)
logger.Log("msg", "starting")
NewWorker(log.With(logger, "component", "worker")).Run()
NewSlacker(log.With(logger, "component", "slacker")).Run()
}
// Output:
// instance_id=123 msg=starting
// instance_id=123 component=worker msg=running
// instance_id=123 component=slacker msg=running
```
### Interact with stdlib logger
Redirect stdlib logger to Go kit logger.
```go
import (
"os"
stdlog "log"
kitlog "github.com/go-kit/kit/log"
)
func main() {
logger := kitlog.NewJSONLogger(kitlog.NewSyncWriter(os.Stdout))
stdlog.SetOutput(kitlog.NewStdlibAdapter(logger))
stdlog.Print("I sure like pie")
}
// Output:
// {"msg":"I sure like pie","ts":"2016/01/01 12:34:56"}
```
Or, if, for legacy reasons, you need to pipe all of your logging through the
stdlib log package, you can redirect Go kit logger to the stdlib logger.
```go
logger := kitlog.NewLogfmtLogger(kitlog.StdlibWriter{})
logger.Log("legacy", true, "msg", "at least it's something")
// Output:
// 2016/01/01 12:34:56 legacy=true msg="at least it's something"
```
### Timestamps and callers
```go
var logger log.Logger
logger = log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
logger = log.With(logger, "ts", log.DefaultTimestampUTC, "caller", log.DefaultCaller)
logger.Log("msg", "hello")
// Output:
// ts=2016-01-01T12:34:56Z caller=main.go:15 msg=hello
```
## Levels
Log levels are supported via the [level package](https://godoc.org/github.com/go-kit/kit/log/level).
## Supported output formats
- [Logfmt](https://brandur.org/logfmt) ([see also](https://blog.codeship.com/logfmt-a-log-format-thats-easy-to-read-and-write))
- JSON
## Enhancements
`package log` is centered on the one-method Logger interface.
```go
type Logger interface {
Log(keyvals ...interface{}) error
}
```
This interface, and its supporting code like is the product of much iteration
and evaluation. For more details on the evolution of the Logger interface,
see [The Hunt for a Logger Interface](http://go-talks.appspot.com/github.com/ChrisHines/talks/structured-logging/structured-logging.slide#1),
a talk by [Chris Hines](https://github.com/ChrisHines).
Also, please see
[#63](https://github.com/go-kit/kit/issues/63),
[#76](https://github.com/go-kit/kit/pull/76),
[#131](https://github.com/go-kit/kit/issues/131),
[#157](https://github.com/go-kit/kit/pull/157),
[#164](https://github.com/go-kit/kit/issues/164), and
[#252](https://github.com/go-kit/kit/pull/252)
to review historical conversations about package log and the Logger interface.
Value-add packages and suggestions,
like improvements to [the leveled logger](https://godoc.org/github.com/go-kit/kit/log/level),
are of course welcome. Good proposals should
- Be composable with [contextual loggers](https://godoc.org/github.com/go-kit/kit/log#With),
- Not break the behavior of [log.Caller](https://godoc.org/github.com/go-kit/kit/log#Caller) in any wrapped contextual loggers, and
- Be friendly to packages that accept only an unadorned log.Logger.
## Benchmarks & comparisons
There are a few Go logging benchmarks and comparisons that include Go kit's package log.
- [imkira/go-loggers-bench](https://github.com/imkira/go-loggers-bench) includes kit/log
- [uber-common/zap](https://github.com/uber-common/zap), a zero-alloc logging library, includes a comparison with kit/log
+116
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// Package log provides a structured logger.
//
// Structured logging produces logs easily consumed later by humans or
// machines. Humans might be interested in debugging errors, or tracing
// specific requests. Machines might be interested in counting interesting
// events, or aggregating information for off-line processing. In both cases,
// it is important that the log messages are structured and actionable.
// Package log is designed to encourage both of these best practices.
//
// Basic Usage
//
// The fundamental interface is Logger. Loggers create log events from
// key/value data. The Logger interface has a single method, Log, which
// accepts a sequence of alternating key/value pairs, which this package names
// keyvals.
//
// type Logger interface {
// Log(keyvals ...interface{}) error
// }
//
// Here is an example of a function using a Logger to create log events.
//
// func RunTask(task Task, logger log.Logger) string {
// logger.Log("taskID", task.ID, "event", "starting task")
// ...
// logger.Log("taskID", task.ID, "event", "task complete")
// }
//
// The keys in the above example are "taskID" and "event". The values are
// task.ID, "starting task", and "task complete". Every key is followed
// immediately by its value.
//
// Keys are usually plain strings. Values may be any type that has a sensible
// encoding in the chosen log format. With structured logging it is a good
// idea to log simple values without formatting them. This practice allows
// the chosen logger to encode values in the most appropriate way.
//
// Contextual Loggers
//
// A contextual logger stores keyvals that it includes in all log events.
// Building appropriate contextual loggers reduces repetition and aids
// consistency in the resulting log output. With and WithPrefix add context to
// a logger. We can use With to improve the RunTask example.
//
// func RunTask(task Task, logger log.Logger) string {
// logger = log.With(logger, "taskID", task.ID)
// logger.Log("event", "starting task")
// ...
// taskHelper(task.Cmd, logger)
// ...
// logger.Log("event", "task complete")
// }
//
// The improved version emits the same log events as the original for the
// first and last calls to Log. Passing the contextual logger to taskHelper
// enables each log event created by taskHelper to include the task.ID even
// though taskHelper does not have access to that value. Using contextual
// loggers this way simplifies producing log output that enables tracing the
// life cycle of individual tasks. (See the Contextual example for the full
// code of the above snippet.)
//
// Dynamic Contextual Values
//
// A Valuer function stored in a contextual logger generates a new value each
// time an event is logged. The Valuer example demonstrates how this feature
// works.
//
// Valuers provide the basis for consistently logging timestamps and source
// code location. The log package defines several valuers for that purpose.
// See Timestamp, DefaultTimestamp, DefaultTimestampUTC, Caller, and
// DefaultCaller. A common logger initialization sequence that ensures all log
// entries contain a timestamp and source location looks like this:
//
// logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stdout))
// logger = log.With(logger, "ts", log.DefaultTimestampUTC, "caller", log.DefaultCaller)
//
// Concurrent Safety
//
// Applications with multiple goroutines want each log event written to the
// same logger to remain separate from other log events. Package log provides
// two simple solutions for concurrent safe logging.
//
// NewSyncWriter wraps an io.Writer and serializes each call to its Write
// method. Using a SyncWriter has the benefit that the smallest practical
// portion of the logging logic is performed within a mutex, but it requires
// the formatting Logger to make only one call to Write per log event.
//
// NewSyncLogger wraps any Logger and serializes each call to its Log method.
// Using a SyncLogger has the benefit that it guarantees each log event is
// handled atomically within the wrapped logger, but it typically serializes
// both the formatting and output logic. Use a SyncLogger if the formatting
// logger may perform multiple writes per log event.
//
// Error Handling
//
// This package relies on the practice of wrapping or decorating loggers with
// other loggers to provide composable pieces of functionality. It also means
// that Logger.Log must return an error because some
// implementations—especially those that output log data to an io.Writer—may
// encounter errors that cannot be handled locally. This in turn means that
// Loggers that wrap other loggers should return errors from the wrapped
// logger up the stack.
//
// Fortunately, the decorator pattern also provides a way to avoid the
// necessity to check for errors every time an application calls Logger.Log.
// An application required to panic whenever its Logger encounters
// an error could initialize its logger as follows.
//
// fmtlogger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stdout))
// logger := log.LoggerFunc(func(keyvals ...interface{}) error {
// if err := fmtlogger.Log(keyvals...); err != nil {
// panic(err)
// }
// return nil
// })
package log
+91
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package log
import (
"encoding"
"encoding/json"
"fmt"
"io"
"reflect"
)
type jsonLogger struct {
io.Writer
}
// NewJSONLogger returns a Logger that encodes keyvals to the Writer as a
// single JSON object. Each log event produces no more than one call to
// w.Write. The passed Writer must be safe for concurrent use by multiple
// goroutines if the returned Logger will be used concurrently.
func NewJSONLogger(w io.Writer) Logger {
return &jsonLogger{w}
}
func (l *jsonLogger) Log(keyvals ...interface{}) error {
n := (len(keyvals) + 1) / 2 // +1 to handle case when len is odd
m := make(map[string]interface{}, n)
for i := 0; i < len(keyvals); i += 2 {
k := keyvals[i]
var v interface{} = ErrMissingValue
if i+1 < len(keyvals) {
v = keyvals[i+1]
}
merge(m, k, v)
}
enc := json.NewEncoder(l.Writer)
enc.SetEscapeHTML(false)
return enc.Encode(m)
}
func merge(dst map[string]interface{}, k, v interface{}) {
var key string
switch x := k.(type) {
case string:
key = x
case fmt.Stringer:
key = safeString(x)
default:
key = fmt.Sprint(x)
}
// We want json.Marshaler and encoding.TextMarshaller to take priority over
// err.Error() and v.String(). But json.Marshall (called later) does that by
// default so we force a no-op if it's one of those 2 case.
switch x := v.(type) {
case json.Marshaler:
case encoding.TextMarshaler:
case error:
v = safeError(x)
case fmt.Stringer:
v = safeString(x)
}
dst[key] = v
}
func safeString(str fmt.Stringer) (s string) {
defer func() {
if panicVal := recover(); panicVal != nil {
if v := reflect.ValueOf(str); v.Kind() == reflect.Ptr && v.IsNil() {
s = "NULL"
} else {
panic(panicVal)
}
}
}()
s = str.String()
return
}
func safeError(err error) (s interface{}) {
defer func() {
if panicVal := recover(); panicVal != nil {
if v := reflect.ValueOf(err); v.Kind() == reflect.Ptr && v.IsNil() {
s = nil
} else {
panic(panicVal)
}
}
}()
s = err.Error()
return
}
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package log
import "errors"
// Logger is the fundamental interface for all log operations. Log creates a
// log event from keyvals, a variadic sequence of alternating keys and values.
// Implementations must be safe for concurrent use by multiple goroutines. In
// particular, any implementation of Logger that appends to keyvals or
// modifies or retains any of its elements must make a copy first.
type Logger interface {
Log(keyvals ...interface{}) error
}
// ErrMissingValue is appended to keyvals slices with odd length to substitute
// the missing value.
var ErrMissingValue = errors.New("(MISSING)")
// With returns a new contextual logger with keyvals prepended to those passed
// to calls to Log. If logger is also a contextual logger created by With or
// WithPrefix, keyvals is appended to the existing context.
//
// The returned Logger replaces all value elements (odd indexes) containing a
// Valuer with their generated value for each call to its Log method.
func With(logger Logger, keyvals ...interface{}) Logger {
if len(keyvals) == 0 {
return logger
}
l := newContext(logger)
kvs := append(l.keyvals, keyvals...)
if len(kvs)%2 != 0 {
kvs = append(kvs, ErrMissingValue)
}
return &context{
logger: l.logger,
// Limiting the capacity of the stored keyvals ensures that a new
// backing array is created if the slice must grow in Log or With.
// Using the extra capacity without copying risks a data race that
// would violate the Logger interface contract.
keyvals: kvs[:len(kvs):len(kvs)],
hasValuer: l.hasValuer || containsValuer(keyvals),
}
}
// WithPrefix returns a new contextual logger with keyvals prepended to those
// passed to calls to Log. If logger is also a contextual logger created by
// With or WithPrefix, keyvals is prepended to the existing context.
//
// The returned Logger replaces all value elements (odd indexes) containing a
// Valuer with their generated value for each call to its Log method.
func WithPrefix(logger Logger, keyvals ...interface{}) Logger {
if len(keyvals) == 0 {
return logger
}
l := newContext(logger)
// Limiting the capacity of the stored keyvals ensures that a new
// backing array is created if the slice must grow in Log or With.
// Using the extra capacity without copying risks a data race that
// would violate the Logger interface contract.
n := len(l.keyvals) + len(keyvals)
if len(keyvals)%2 != 0 {
n++
}
kvs := make([]interface{}, 0, n)
kvs = append(kvs, keyvals...)
if len(kvs)%2 != 0 {
kvs = append(kvs, ErrMissingValue)
}
kvs = append(kvs, l.keyvals...)
return &context{
logger: l.logger,
keyvals: kvs,
hasValuer: l.hasValuer || containsValuer(keyvals),
}
}
// context is the Logger implementation returned by With and WithPrefix. It
// wraps a Logger and holds keyvals that it includes in all log events. Its
// Log method calls bindValues to generate values for each Valuer in the
// context keyvals.
//
// A context must always have the same number of stack frames between calls to
// its Log method and the eventual binding of Valuers to their value. This
// requirement comes from the functional requirement to allow a context to
// resolve application call site information for a Caller stored in the
// context. To do this we must be able to predict the number of logging
// functions on the stack when bindValues is called.
//
// Two implementation details provide the needed stack depth consistency.
//
// 1. newContext avoids introducing an additional layer when asked to
// wrap another context.
// 2. With and WithPrefix avoid introducing an additional layer by
// returning a newly constructed context with a merged keyvals rather
// than simply wrapping the existing context.
type context struct {
logger Logger
keyvals []interface{}
hasValuer bool
}
func newContext(logger Logger) *context {
if c, ok := logger.(*context); ok {
return c
}
return &context{logger: logger}
}
// Log replaces all value elements (odd indexes) containing a Valuer in the
// stored context with their generated value, appends keyvals, and passes the
// result to the wrapped Logger.
func (l *context) Log(keyvals ...interface{}) error {
kvs := append(l.keyvals, keyvals...)
if len(kvs)%2 != 0 {
kvs = append(kvs, ErrMissingValue)
}
if l.hasValuer {
// If no keyvals were appended above then we must copy l.keyvals so
// that future log events will reevaluate the stored Valuers.
if len(keyvals) == 0 {
kvs = append([]interface{}{}, l.keyvals...)
}
bindValues(kvs[:len(l.keyvals)])
}
return l.logger.Log(kvs...)
}
// LoggerFunc is an adapter to allow use of ordinary functions as Loggers. If
// f is a function with the appropriate signature, LoggerFunc(f) is a Logger
// object that calls f.
type LoggerFunc func(...interface{}) error
// Log implements Logger by calling f(keyvals...).
func (f LoggerFunc) Log(keyvals ...interface{}) error {
return f(keyvals...)
}
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package log
import (
"bytes"
"io"
"sync"
"github.com/go-logfmt/logfmt"
)
type logfmtEncoder struct {
*logfmt.Encoder
buf bytes.Buffer
}
func (l *logfmtEncoder) Reset() {
l.Encoder.Reset()
l.buf.Reset()
}
var logfmtEncoderPool = sync.Pool{
New: func() interface{} {
var enc logfmtEncoder
enc.Encoder = logfmt.NewEncoder(&enc.buf)
return &enc
},
}
type logfmtLogger struct {
w io.Writer
}
// NewLogfmtLogger returns a logger that encodes keyvals to the Writer in
// logfmt format. Each log event produces no more than one call to w.Write.
// The passed Writer must be safe for concurrent use by multiple goroutines if
// the returned Logger will be used concurrently.
func NewLogfmtLogger(w io.Writer) Logger {
return &logfmtLogger{w}
}
func (l logfmtLogger) Log(keyvals ...interface{}) error {
enc := logfmtEncoderPool.Get().(*logfmtEncoder)
enc.Reset()
defer logfmtEncoderPool.Put(enc)
if err := enc.EncodeKeyvals(keyvals...); err != nil {
return err
}
// Add newline to the end of the buffer
if err := enc.EndRecord(); err != nil {
return err
}
// The Logger interface requires implementations to be safe for concurrent
// use by multiple goroutines. For this implementation that means making
// only one call to l.w.Write() for each call to Log.
if _, err := l.w.Write(enc.buf.Bytes()); err != nil {
return err
}
return nil
}
+8
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package log
type nopLogger struct{}
// NewNopLogger returns a logger that doesn't do anything.
func NewNopLogger() Logger { return nopLogger{} }
func (nopLogger) Log(...interface{}) error { return nil }
+116
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package log
import (
"io"
"log"
"regexp"
"strings"
)
// StdlibWriter implements io.Writer by invoking the stdlib log.Print. It's
// designed to be passed to a Go kit logger as the writer, for cases where
// it's necessary to redirect all Go kit log output to the stdlib logger.
//
// If you have any choice in the matter, you shouldn't use this. Prefer to
// redirect the stdlib log to the Go kit logger via NewStdlibAdapter.
type StdlibWriter struct{}
// Write implements io.Writer.
func (w StdlibWriter) Write(p []byte) (int, error) {
log.Print(strings.TrimSpace(string(p)))
return len(p), nil
}
// StdlibAdapter wraps a Logger and allows it to be passed to the stdlib
// logger's SetOutput. It will extract date/timestamps, filenames, and
// messages, and place them under relevant keys.
type StdlibAdapter struct {
Logger
timestampKey string
fileKey string
messageKey string
}
// StdlibAdapterOption sets a parameter for the StdlibAdapter.
type StdlibAdapterOption func(*StdlibAdapter)
// TimestampKey sets the key for the timestamp field. By default, it's "ts".
func TimestampKey(key string) StdlibAdapterOption {
return func(a *StdlibAdapter) { a.timestampKey = key }
}
// FileKey sets the key for the file and line field. By default, it's "caller".
func FileKey(key string) StdlibAdapterOption {
return func(a *StdlibAdapter) { a.fileKey = key }
}
// MessageKey sets the key for the actual log message. By default, it's "msg".
func MessageKey(key string) StdlibAdapterOption {
return func(a *StdlibAdapter) { a.messageKey = key }
}
// NewStdlibAdapter returns a new StdlibAdapter wrapper around the passed
// logger. It's designed to be passed to log.SetOutput.
func NewStdlibAdapter(logger Logger, options ...StdlibAdapterOption) io.Writer {
a := StdlibAdapter{
Logger: logger,
timestampKey: "ts",
fileKey: "caller",
messageKey: "msg",
}
for _, option := range options {
option(&a)
}
return a
}
func (a StdlibAdapter) Write(p []byte) (int, error) {
result := subexps(p)
keyvals := []interface{}{}
var timestamp string
if date, ok := result["date"]; ok && date != "" {
timestamp = date
}
if time, ok := result["time"]; ok && time != "" {
if timestamp != "" {
timestamp += " "
}
timestamp += time
}
if timestamp != "" {
keyvals = append(keyvals, a.timestampKey, timestamp)
}
if file, ok := result["file"]; ok && file != "" {
keyvals = append(keyvals, a.fileKey, file)
}
if msg, ok := result["msg"]; ok {
keyvals = append(keyvals, a.messageKey, msg)
}
if err := a.Logger.Log(keyvals...); err != nil {
return 0, err
}
return len(p), nil
}
const (
logRegexpDate = `(?P<date>[0-9]{4}/[0-9]{2}/[0-9]{2})?[ ]?`
logRegexpTime = `(?P<time>[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]+)?)?[ ]?`
logRegexpFile = `(?P<file>.+?:[0-9]+)?`
logRegexpMsg = `(: )?(?P<msg>.*)`
)
var (
logRegexp = regexp.MustCompile(logRegexpDate + logRegexpTime + logRegexpFile + logRegexpMsg)
)
func subexps(line []byte) map[string]string {
m := logRegexp.FindSubmatch(line)
if len(m) < len(logRegexp.SubexpNames()) {
return map[string]string{}
}
result := map[string]string{}
for i, name := range logRegexp.SubexpNames() {
result[name] = string(m[i])
}
return result
}
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package log
import (
"io"
"sync"
"sync/atomic"
)
// SwapLogger wraps another logger that may be safely replaced while other
// goroutines use the SwapLogger concurrently. The zero value for a SwapLogger
// will discard all log events without error.
//
// SwapLogger serves well as a package global logger that can be changed by
// importers.
type SwapLogger struct {
logger atomic.Value
}
type loggerStruct struct {
Logger
}
// Log implements the Logger interface by forwarding keyvals to the currently
// wrapped logger. It does not log anything if the wrapped logger is nil.
func (l *SwapLogger) Log(keyvals ...interface{}) error {
s, ok := l.logger.Load().(loggerStruct)
if !ok || s.Logger == nil {
return nil
}
return s.Log(keyvals...)
}
// Swap replaces the currently wrapped logger with logger. Swap may be called
// concurrently with calls to Log from other goroutines.
func (l *SwapLogger) Swap(logger Logger) {
l.logger.Store(loggerStruct{logger})
}
// NewSyncWriter returns a new writer that is safe for concurrent use by
// multiple goroutines. Writes to the returned writer are passed on to w. If
// another write is already in progress, the calling goroutine blocks until
// the writer is available.
//
// If w implements the following interface, so does the returned writer.
//
// interface {
// Fd() uintptr
// }
func NewSyncWriter(w io.Writer) io.Writer {
switch w := w.(type) {
case fdWriter:
return &fdSyncWriter{fdWriter: w}
default:
return &syncWriter{Writer: w}
}
}
// syncWriter synchronizes concurrent writes to an io.Writer.
type syncWriter struct {
sync.Mutex
io.Writer
}
// Write writes p to the underlying io.Writer. If another write is already in
// progress, the calling goroutine blocks until the syncWriter is available.
func (w *syncWriter) Write(p []byte) (n int, err error) {
w.Lock()
n, err = w.Writer.Write(p)
w.Unlock()
return n, err
}
// fdWriter is an io.Writer that also has an Fd method. The most common
// example of an fdWriter is an *os.File.
type fdWriter interface {
io.Writer
Fd() uintptr
}
// fdSyncWriter synchronizes concurrent writes to an fdWriter.
type fdSyncWriter struct {
sync.Mutex
fdWriter
}
// Write writes p to the underlying io.Writer. If another write is already in
// progress, the calling goroutine blocks until the fdSyncWriter is available.
func (w *fdSyncWriter) Write(p []byte) (n int, err error) {
w.Lock()
n, err = w.fdWriter.Write(p)
w.Unlock()
return n, err
}
// syncLogger provides concurrent safe logging for another Logger.
type syncLogger struct {
mu sync.Mutex
logger Logger
}
// NewSyncLogger returns a logger that synchronizes concurrent use of the
// wrapped logger. When multiple goroutines use the SyncLogger concurrently
// only one goroutine will be allowed to log to the wrapped logger at a time.
// The other goroutines will block until the logger is available.
func NewSyncLogger(logger Logger) Logger {
return &syncLogger{logger: logger}
}
// Log logs keyvals to the underlying Logger. If another log is already in
// progress, the calling goroutine blocks until the syncLogger is available.
func (l *syncLogger) Log(keyvals ...interface{}) error {
l.mu.Lock()
err := l.logger.Log(keyvals...)
l.mu.Unlock()
return err
}
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package log
import (
"runtime"
"strconv"
"strings"
"time"
)
// A Valuer generates a log value. When passed to With or WithPrefix in a
// value element (odd indexes), it represents a dynamic value which is re-
// evaluated with each log event.
type Valuer func() interface{}
// bindValues replaces all value elements (odd indexes) containing a Valuer
// with their generated value.
func bindValues(keyvals []interface{}) {
for i := 1; i < len(keyvals); i += 2 {
if v, ok := keyvals[i].(Valuer); ok {
keyvals[i] = v()
}
}
}
// containsValuer returns true if any of the value elements (odd indexes)
// contain a Valuer.
func containsValuer(keyvals []interface{}) bool {
for i := 1; i < len(keyvals); i += 2 {
if _, ok := keyvals[i].(Valuer); ok {
return true
}
}
return false
}
// Timestamp returns a timestamp Valuer. It invokes the t function to get the
// time; unless you are doing something tricky, pass time.Now.
//
// Most users will want to use DefaultTimestamp or DefaultTimestampUTC, which
// are TimestampFormats that use the RFC3339Nano format.
func Timestamp(t func() time.Time) Valuer {
return func() interface{} { return t() }
}
// TimestampFormat returns a timestamp Valuer with a custom time format. It
// invokes the t function to get the time to format; unless you are doing
// something tricky, pass time.Now. The layout string is passed to
// Time.Format.
//
// Most users will want to use DefaultTimestamp or DefaultTimestampUTC, which
// are TimestampFormats that use the RFC3339Nano format.
func TimestampFormat(t func() time.Time, layout string) Valuer {
return func() interface{} {
return timeFormat{
time: t(),
layout: layout,
}
}
}
// A timeFormat represents an instant in time and a layout used when
// marshaling to a text format.
type timeFormat struct {
time time.Time
layout string
}
func (tf timeFormat) String() string {
return tf.time.Format(tf.layout)
}
// MarshalText implements encoding.TextMarshaller.
func (tf timeFormat) MarshalText() (text []byte, err error) {
// The following code adapted from the standard library time.Time.Format
// method. Using the same undocumented magic constant to extend the size
// of the buffer as seen there.
b := make([]byte, 0, len(tf.layout)+10)
b = tf.time.AppendFormat(b, tf.layout)
return b, nil
}
// Caller returns a Valuer that returns a file and line from a specified depth
// in the callstack. Users will probably want to use DefaultCaller.
func Caller(depth int) Valuer {
return func() interface{} {
_, file, line, _ := runtime.Caller(depth)
idx := strings.LastIndexByte(file, '/')
// using idx+1 below handles both of following cases:
// idx == -1 because no "/" was found, or
// idx >= 0 and we want to start at the character after the found "/".
return file[idx+1:] + ":" + strconv.Itoa(line)
}
}
var (
// DefaultTimestamp is a Valuer that returns the current wallclock time,
// respecting time zones, when bound.
DefaultTimestamp = TimestampFormat(time.Now, time.RFC3339Nano)
// DefaultTimestampUTC is a Valuer that returns the current time in UTC
// when bound.
DefaultTimestampUTC = TimestampFormat(
func() time.Time { return time.Now().UTC() },
time.RFC3339Nano,
)
// DefaultCaller is a Valuer that returns the file and line where the Log
// method was invoked. It can only be used with log.With.
DefaultCaller = Caller(3)
)
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# package metrics
`package metrics` provides a set of uniform interfaces for service instrumentation.
It has
[counters](http://prometheus.io/docs/concepts/metric_types/#counter),
[gauges](http://prometheus.io/docs/concepts/metric_types/#gauge), and
[histograms](http://prometheus.io/docs/concepts/metric_types/#histogram),
and provides adapters to popular metrics packages, like
[expvar](https://golang.org/pkg/expvar),
[StatsD](https://github.com/etsy/statsd), and
[Prometheus](https://prometheus.io).
## Rationale
Code instrumentation is absolutely essential to achieve
[observability](https://speakerdeck.com/mattheath/observability-in-micro-service-architectures)
into a distributed system.
Metrics and instrumentation tools have coalesced around a few well-defined idioms.
`package metrics` provides a common, minimal interface those idioms for service authors.
## Usage
A simple counter, exported via expvar.
```go
import (
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/expvar"
)
func main() {
var myCount metrics.Counter
myCount = expvar.NewCounter("my_count")
myCount.Add(1)
}
```
A histogram for request duration,
exported via a Prometheus summary with dynamically-computed quantiles.
```go
import (
"time"
stdprometheus "github.com/prometheus/client_golang/prometheus"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/prometheus"
)
func main() {
var dur metrics.Histogram = prometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "myservice",
Subsystem: "api",
Name: "request_duration_seconds",
Help: "Total time spent serving requests.",
}, []string{})
// ...
}
func handleRequest(dur metrics.Histogram) {
defer func(begin time.Time) { dur.Observe(time.Since(begin).Seconds()) }(time.Now())
// handle request
}
```
A gauge for the number of goroutines currently running, exported via StatsD.
```go
import (
"context"
"net"
"os"
"runtime"
"time"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/statsd"
)
func main() {
statsd := statsd.New("foo_svc.", log.NewNopLogger())
report := time.NewTicker(5 * time.Second)
defer report.Stop()
go statsd.SendLoop(context.Background(), report.C, "tcp", "statsd.internal:8125")
goroutines := statsd.NewGauge("goroutine_count")
go exportGoroutines(goroutines)
// ...
}
func exportGoroutines(g metrics.Gauge) {
for range time.Tick(time.Second) {
g.Set(float64(runtime.NumGoroutine()))
}
}
```
For more information, see [the package documentation](https://godoc.org/github.com/go-kit/kit/metrics).
+97
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// Package metrics provides a framework for application instrumentation. It's
// primarily designed to help you get started with good and robust
// instrumentation, and to help you migrate from a less-capable system like
// Graphite to a more-capable system like Prometheus. If your organization has
// already standardized on an instrumentation system like Prometheus, and has no
// plans to change, it may make sense to use that system's instrumentation
// library directly.
//
// This package provides three core metric abstractions (Counter, Gauge, and
// Histogram) and implementations for almost all common instrumentation
// backends. Each metric has an observation method (Add, Set, or Observe,
// respectively) used to record values, and a With method to "scope" the
// observation by various parameters. For example, you might have a Histogram to
// record request durations, parameterized by the method that's being called.
//
// var requestDuration metrics.Histogram
// // ...
// requestDuration.With("method", "MyMethod").Observe(time.Since(begin))
//
// This allows a single high-level metrics object (requestDuration) to work with
// many code paths somewhat dynamically. The concept of With is fully supported
// in some backends like Prometheus, and not supported in other backends like
// Graphite. So, With may be a no-op, depending on the concrete implementation
// you choose. Please check the implementation to know for sure. For
// implementations that don't provide With, it's necessary to fully parameterize
// each metric in the metric name, e.g.
//
// // Statsd
// c := statsd.NewCounter("request_duration_MyMethod_200")
// c.Add(1)
//
// // Prometheus
// c := prometheus.NewCounter(stdprometheus.CounterOpts{
// Name: "request_duration",
// ...
// }, []string{"method", "status_code"})
// c.With("method", "MyMethod", "status_code", strconv.Itoa(code)).Add(1)
//
// Usage
//
// Metrics are dependencies, and should be passed to the components that need
// them in the same way you'd construct and pass a database handle, or reference
// to another component. Metrics should *not* be created in the global scope.
// Instead, instantiate metrics in your func main, using whichever concrete
// implementation is appropriate for your organization.
//
// latency := prometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
// Namespace: "myteam",
// Subsystem: "foosvc",
// Name: "request_latency_seconds",
// Help: "Incoming request latency in seconds.",
// }, []string{"method", "status_code"})
//
// Write your components to take the metrics they will use as parameters to
// their constructors. Use the interface types, not the concrete types. That is,
//
// // NewAPI takes metrics.Histogram, not *prometheus.Summary
// func NewAPI(s Store, logger log.Logger, latency metrics.Histogram) *API {
// // ...
// }
//
// func (a *API) ServeFoo(w http.ResponseWriter, r *http.Request) {
// begin := time.Now()
// // ...
// a.latency.Observe(time.Since(begin).Seconds())
// }
//
// Finally, pass the metrics as dependencies when building your object graph.
// This should happen in func main, not in the global scope.
//
// api := NewAPI(store, logger, latency)
// http.ListenAndServe("/", api)
//
// Note that metrics are "write-only" interfaces.
//
// Implementation details
//
// All metrics are safe for concurrent use. Considerable design influence has
// been taken from https://github.com/codahale/metrics and
// https://prometheus.io.
//
// Each telemetry system has different semantics for label values, push vs.
// pull, support for histograms, etc. These properties influence the design of
// their respective packages. This table attempts to summarize the key points of
// distinction.
//
// SYSTEM DIM COUNTERS GAUGES HISTOGRAMS
// dogstatsd n batch, push-aggregate batch, push-aggregate native, batch, push-each
// statsd 1 batch, push-aggregate batch, push-aggregate native, batch, push-each
// graphite 1 batch, push-aggregate batch, push-aggregate synthetic, batch, push-aggregate
// expvar 1 atomic atomic synthetic, batch, in-place expose
// influx n custom custom custom
// prometheus n native native native
// pcp 1 native native native
// cloudwatch n batch push-aggregate batch push-aggregate synthetic, batch, push-aggregate
//
package metrics
+14
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package lv
// LabelValues is a type alias that provides validation on its With method.
// Metrics may include it as a member to help them satisfy With semantics and
// save some code duplication.
type LabelValues []string
// With validates the input, and returns a new aggregate labelValues.
func (lvs LabelValues) With(labelValues ...string) LabelValues {
if len(labelValues)%2 != 0 {
labelValues = append(labelValues, "unknown")
}
return append(lvs, labelValues...)
}
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package lv
import "sync"
// NewSpace returns an N-dimensional vector space.
func NewSpace() *Space {
return &Space{}
}
// Space represents an N-dimensional vector space. Each name and unique label
// value pair establishes a new dimension and point within that dimension. Order
// matters, i.e. [a=1 b=2] identifies a different timeseries than [b=2 a=1].
type Space struct {
mtx sync.RWMutex
nodes map[string]*node
}
// Observe locates the time series identified by the name and label values in
// the vector space, and appends the value to the list of observations.
func (s *Space) Observe(name string, lvs LabelValues, value float64) {
s.nodeFor(name).observe(lvs, value)
}
// Add locates the time series identified by the name and label values in
// the vector space, and appends the delta to the last value in the list of
// observations.
func (s *Space) Add(name string, lvs LabelValues, delta float64) {
s.nodeFor(name).add(lvs, delta)
}
// Walk traverses the vector space and invokes fn for each non-empty time series
// which is encountered. Return false to abort the traversal.
func (s *Space) Walk(fn func(name string, lvs LabelValues, observations []float64) bool) {
s.mtx.RLock()
defer s.mtx.RUnlock()
for name, node := range s.nodes {
f := func(lvs LabelValues, observations []float64) bool { return fn(name, lvs, observations) }
if !node.walk(LabelValues{}, f) {
return
}
}
}
// Reset empties the current space and returns a new Space with the old
// contents. Reset a Space to get an immutable copy suitable for walking.
func (s *Space) Reset() *Space {
s.mtx.Lock()
defer s.mtx.Unlock()
n := NewSpace()
n.nodes, s.nodes = s.nodes, n.nodes
return n
}
func (s *Space) nodeFor(name string) *node {
s.mtx.Lock()
defer s.mtx.Unlock()
if s.nodes == nil {
s.nodes = map[string]*node{}
}
n, ok := s.nodes[name]
if !ok {
n = &node{}
s.nodes[name] = n
}
return n
}
// node exists at a specific point in the N-dimensional vector space of all
// possible label values. The node collects observations and has child nodes
// with greater specificity.
type node struct {
mtx sync.RWMutex
observations []float64
children map[pair]*node
}
type pair struct{ label, value string }
func (n *node) observe(lvs LabelValues, value float64) {
n.mtx.Lock()
defer n.mtx.Unlock()
if len(lvs) <= 0 {
n.observations = append(n.observations, value)
return
}
if len(lvs) < 2 {
panic("too few LabelValues; programmer error!")
}
head, tail := pair{lvs[0], lvs[1]}, lvs[2:]
if n.children == nil {
n.children = map[pair]*node{}
}
child, ok := n.children[head]
if !ok {
child = &node{}
n.children[head] = child
}
child.observe(tail, value)
}
func (n *node) add(lvs LabelValues, delta float64) {
n.mtx.Lock()
defer n.mtx.Unlock()
if len(lvs) <= 0 {
var value float64
if len(n.observations) > 0 {
value = last(n.observations) + delta
} else {
value = delta
}
n.observations = append(n.observations, value)
return
}
if len(lvs) < 2 {
panic("too few LabelValues; programmer error!")
}
head, tail := pair{lvs[0], lvs[1]}, lvs[2:]
if n.children == nil {
n.children = map[pair]*node{}
}
child, ok := n.children[head]
if !ok {
child = &node{}
n.children[head] = child
}
child.add(tail, delta)
}
func (n *node) walk(lvs LabelValues, fn func(LabelValues, []float64) bool) bool {
n.mtx.RLock()
defer n.mtx.RUnlock()
if len(n.observations) > 0 && !fn(lvs, n.observations) {
return false
}
for p, child := range n.children {
if !child.walk(append(lvs, p.label, p.value), fn) {
return false
}
}
return true
}
func last(a []float64) float64 {
return a[len(a)-1]
}
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package metrics
// Counter describes a metric that accumulates values monotonically.
// An example of a counter is the number of received HTTP requests.
type Counter interface {
With(labelValues ...string) Counter
Add(delta float64)
}
// Gauge describes a metric that takes specific values over time.
// An example of a gauge is the current depth of a job queue.
type Gauge interface {
With(labelValues ...string) Gauge
Set(value float64)
Add(delta float64)
}
// Histogram describes a metric that takes repeated observations of the same
// kind of thing, and produces a statistical summary of those observations,
// typically expressed as quantiles or buckets. An example of a histogram is
// HTTP request latencies.
type Histogram interface {
With(labelValues ...string) Histogram
Observe(value float64)
}
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// Package prometheus provides Prometheus implementations for metrics.
// Individual metrics are mapped to their Prometheus counterparts, and
// (depending on the constructor used) may be automatically registered in the
// global Prometheus metrics registry.
package prometheus
import (
"github.com/prometheus/client_golang/prometheus"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/internal/lv"
)
// Counter implements Counter, via a Prometheus CounterVec.
type Counter struct {
cv *prometheus.CounterVec
lvs lv.LabelValues
}
// NewCounterFrom constructs and registers a Prometheus CounterVec,
// and returns a usable Counter object.
func NewCounterFrom(opts prometheus.CounterOpts, labelNames []string) *Counter {
cv := prometheus.NewCounterVec(opts, labelNames)
prometheus.MustRegister(cv)
return NewCounter(cv)
}
// NewCounter wraps the CounterVec and returns a usable Counter object.
func NewCounter(cv *prometheus.CounterVec) *Counter {
return &Counter{
cv: cv,
}
}
// With implements Counter.
func (c *Counter) With(labelValues ...string) metrics.Counter {
return &Counter{
cv: c.cv,
lvs: c.lvs.With(labelValues...),
}
}
// Add implements Counter.
func (c *Counter) Add(delta float64) {
c.cv.With(makeLabels(c.lvs...)).Add(delta)
}
// Gauge implements Gauge, via a Prometheus GaugeVec.
type Gauge struct {
gv *prometheus.GaugeVec
lvs lv.LabelValues
}
// NewGaugeFrom constructs and registers a Prometheus GaugeVec,
// and returns a usable Gauge object.
func NewGaugeFrom(opts prometheus.GaugeOpts, labelNames []string) *Gauge {
gv := prometheus.NewGaugeVec(opts, labelNames)
prometheus.MustRegister(gv)
return NewGauge(gv)
}
// NewGauge wraps the GaugeVec and returns a usable Gauge object.
func NewGauge(gv *prometheus.GaugeVec) *Gauge {
return &Gauge{
gv: gv,
}
}
// With implements Gauge.
func (g *Gauge) With(labelValues ...string) metrics.Gauge {
return &Gauge{
gv: g.gv,
lvs: g.lvs.With(labelValues...),
}
}
// Set implements Gauge.
func (g *Gauge) Set(value float64) {
g.gv.With(makeLabels(g.lvs...)).Set(value)
}
// Add is supported by Prometheus GaugeVecs.
func (g *Gauge) Add(delta float64) {
g.gv.With(makeLabels(g.lvs...)).Add(delta)
}
// Summary implements Histogram, via a Prometheus SummaryVec. The difference
// between a Summary and a Histogram is that Summaries don't require predefined
// quantile buckets, but cannot be statistically aggregated.
type Summary struct {
sv *prometheus.SummaryVec
lvs lv.LabelValues
}
// NewSummaryFrom constructs and registers a Prometheus SummaryVec,
// and returns a usable Summary object.
func NewSummaryFrom(opts prometheus.SummaryOpts, labelNames []string) *Summary {
sv := prometheus.NewSummaryVec(opts, labelNames)
prometheus.MustRegister(sv)
return NewSummary(sv)
}
// NewSummary wraps the SummaryVec and returns a usable Summary object.
func NewSummary(sv *prometheus.SummaryVec) *Summary {
return &Summary{
sv: sv,
}
}
// With implements Histogram.
func (s *Summary) With(labelValues ...string) metrics.Histogram {
return &Summary{
sv: s.sv,
lvs: s.lvs.With(labelValues...),
}
}
// Observe implements Histogram.
func (s *Summary) Observe(value float64) {
s.sv.With(makeLabels(s.lvs...)).Observe(value)
}
// Histogram implements Histogram via a Prometheus HistogramVec. The difference
// between a Histogram and a Summary is that Histograms require predefined
// quantile buckets, and can be statistically aggregated.
type Histogram struct {
hv *prometheus.HistogramVec
lvs lv.LabelValues
}
// NewHistogramFrom constructs and registers a Prometheus HistogramVec,
// and returns a usable Histogram object.
func NewHistogramFrom(opts prometheus.HistogramOpts, labelNames []string) *Histogram {
hv := prometheus.NewHistogramVec(opts, labelNames)
prometheus.MustRegister(hv)
return NewHistogram(hv)
}
// NewHistogram wraps the HistogramVec and returns a usable Histogram object.
func NewHistogram(hv *prometheus.HistogramVec) *Histogram {
return &Histogram{
hv: hv,
}
}
// With implements Histogram.
func (h *Histogram) With(labelValues ...string) metrics.Histogram {
return &Histogram{
hv: h.hv,
lvs: h.lvs.With(labelValues...),
}
}
// Observe implements Histogram.
func (h *Histogram) Observe(value float64) {
h.hv.With(makeLabels(h.lvs...)).Observe(value)
}
func makeLabels(labelValues ...string) prometheus.Labels {
labels := prometheus.Labels{}
for i := 0; i < len(labelValues); i += 2 {
labels[labelValues[i]] = labelValues[i+1]
}
return labels
}
+36
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package metrics
import "time"
// Timer acts as a stopwatch, sending observations to a wrapped histogram.
// It's a bit of helpful syntax sugar for h.Observe(time.Since(x)).
type Timer struct {
h Histogram
t time.Time
u time.Duration
}
// NewTimer wraps the given histogram and records the current time.
func NewTimer(h Histogram) *Timer {
return &Timer{
h: h,
t: time.Now(),
u: time.Second,
}
}
// ObserveDuration captures the number of seconds since the timer was
// constructed, and forwards that observation to the histogram.
func (t *Timer) ObserveDuration() {
d := float64(time.Since(t.t).Nanoseconds()) / float64(t.u)
if d < 0 {
d = 0
}
t.h.Observe(d)
}
// Unit sets the unit of the float64 emitted by the timer.
// By default, the timer emits seconds.
func (t *Timer) Unit(u time.Duration) {
t.u = u
}
+4
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// Package opentracing provides Go kit integration to the OpenTracing project.
// OpenTracing implements a general purpose interface that microservices can
// program against, and which adapts to all major distributed tracing systems.
package opentracing
+55
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package opentracing
import (
"context"
"github.com/opentracing/opentracing-go"
otext "github.com/opentracing/opentracing-go/ext"
"github.com/go-kit/kit/endpoint"
)
// TraceServer returns a Middleware that wraps the `next` Endpoint in an
// OpenTracing Span called `operationName`.
//
// If `ctx` already has a Span, it is re-used and the operation name is
// overwritten. If `ctx` does not yet have a Span, one is created here.
func TraceServer(tracer opentracing.Tracer, operationName string) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (interface{}, error) {
serverSpan := opentracing.SpanFromContext(ctx)
if serverSpan == nil {
// All we can do is create a new root span.
serverSpan = tracer.StartSpan(operationName)
} else {
serverSpan.SetOperationName(operationName)
}
defer serverSpan.Finish()
otext.SpanKindRPCServer.Set(serverSpan)
ctx = opentracing.ContextWithSpan(ctx, serverSpan)
return next(ctx, request)
}
}
}
// TraceClient returns a Middleware that wraps the `next` Endpoint in an
// OpenTracing Span called `operationName`.
func TraceClient(tracer opentracing.Tracer, operationName string) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (interface{}, error) {
var clientSpan opentracing.Span
if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
clientSpan = tracer.StartSpan(
operationName,
opentracing.ChildOf(parentSpan.Context()),
)
} else {
clientSpan = tracer.StartSpan(operationName)
}
defer clientSpan.Finish()
otext.SpanKindRPCClient.Set(clientSpan)
ctx = opentracing.ContextWithSpan(ctx, clientSpan)
return next(ctx, request)
}
}
}
+70
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package opentracing
import (
"context"
"encoding/base64"
"strings"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"google.golang.org/grpc/metadata"
"github.com/go-kit/kit/log"
)
// ContextToGRPC returns a grpc RequestFunc that injects an OpenTracing Span
// found in `ctx` into the grpc Metadata. If no such Span can be found, the
// RequestFunc is a noop.
func ContextToGRPC(tracer opentracing.Tracer, logger log.Logger) func(ctx context.Context, md *metadata.MD) context.Context {
return func(ctx context.Context, md *metadata.MD) context.Context {
if span := opentracing.SpanFromContext(ctx); span != nil {
// There's nothing we can do with an error here.
if err := tracer.Inject(span.Context(), opentracing.TextMap, metadataReaderWriter{md}); err != nil {
logger.Log("err", err)
}
}
return ctx
}
}
// GRPCToContext returns a grpc RequestFunc that tries to join with an
// OpenTracing trace found in `req` and starts a new Span called
// `operationName` accordingly. If no trace could be found in `req`, the Span
// will be a trace root. The Span is incorporated in the returned Context and
// can be retrieved with opentracing.SpanFromContext(ctx).
func GRPCToContext(tracer opentracing.Tracer, operationName string, logger log.Logger) func(ctx context.Context, md metadata.MD) context.Context {
return func(ctx context.Context, md metadata.MD) context.Context {
var span opentracing.Span
wireContext, err := tracer.Extract(opentracing.TextMap, metadataReaderWriter{&md})
if err != nil && err != opentracing.ErrSpanContextNotFound {
logger.Log("err", err)
}
span = tracer.StartSpan(operationName, ext.RPCServerOption(wireContext))
return opentracing.ContextWithSpan(ctx, span)
}
}
// A type that conforms to opentracing.TextMapReader and
// opentracing.TextMapWriter.
type metadataReaderWriter struct {
*metadata.MD
}
func (w metadataReaderWriter) Set(key, val string) {
key = strings.ToLower(key)
if strings.HasSuffix(key, "-bin") {
val = base64.StdEncoding.EncodeToString([]byte(val))
}
(*w.MD)[key] = append((*w.MD)[key], val)
}
func (w metadataReaderWriter) ForeachKey(handler func(key, val string) error) error {
for k, vals := range *w.MD {
for _, v := range vals {
if err := handler(k, v); err != nil {
return err
}
}
}
return nil
}
+71
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package opentracing
import (
"context"
"net"
"net/http"
"strconv"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/go-kit/kit/log"
kithttp "github.com/go-kit/kit/transport/http"
)
// ContextToHTTP returns an http RequestFunc that injects an OpenTracing Span
// found in `ctx` into the http headers. If no such Span can be found, the
// RequestFunc is a noop.
func ContextToHTTP(tracer opentracing.Tracer, logger log.Logger) kithttp.RequestFunc {
return func(ctx context.Context, req *http.Request) context.Context {
// Try to find a Span in the Context.
if span := opentracing.SpanFromContext(ctx); span != nil {
// Add standard OpenTracing tags.
ext.HTTPMethod.Set(span, req.Method)
ext.HTTPUrl.Set(span, req.URL.String())
host, portString, err := net.SplitHostPort(req.URL.Host)
if err == nil {
ext.PeerHostname.Set(span, host)
if port, err := strconv.Atoi(portString); err == nil {
ext.PeerPort.Set(span, uint16(port))
}
} else {
ext.PeerHostname.Set(span, req.URL.Host)
}
// There's nothing we can do with any errors here.
if err = tracer.Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(req.Header),
); err != nil {
logger.Log("err", err)
}
}
return ctx
}
}
// HTTPToContext returns an http RequestFunc that tries to join with an
// OpenTracing trace found in `req` and starts a new Span called
// `operationName` accordingly. If no trace could be found in `req`, the Span
// will be a trace root. The Span is incorporated in the returned Context and
// can be retrieved with opentracing.SpanFromContext(ctx).
func HTTPToContext(tracer opentracing.Tracer, operationName string, logger log.Logger) kithttp.RequestFunc {
return func(ctx context.Context, req *http.Request) context.Context {
// Try to join to a trace propagated in `req`.
var span opentracing.Span
wireContext, err := tracer.Extract(
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(req.Header),
)
if err != nil && err != opentracing.ErrSpanContextNotFound {
logger.Log("err", err)
}
span = tracer.StartSpan(operationName, ext.RPCServerOption(wireContext))
ext.HTTPMethod.Set(span, req.Method)
ext.HTTPUrl.Set(span, req.URL.String())
return opentracing.ContextWithSpan(ctx, span)
}
}
+2
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@@ -0,0 +1,2 @@
// Package transport contains helpers applicable to all supported transports.
package transport
+39
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@@ -0,0 +1,39 @@
package transport
import (
"context"
"github.com/go-kit/kit/log"
)
// ErrorHandler receives a transport error to be processed for diagnostic purposes.
// Usually this means logging the error.
type ErrorHandler interface {
Handle(ctx context.Context, err error)
}
// LogErrorHandler is a transport error handler implementation which logs an error.
type LogErrorHandler struct {
logger log.Logger
}
func NewLogErrorHandler(logger log.Logger) *LogErrorHandler {
return &LogErrorHandler{
logger: logger,
}
}
func (h *LogErrorHandler) Handle(ctx context.Context, err error) {
h.logger.Log("err", err)
}
// The ErrorHandlerFunc type is an adapter to allow the use of
// ordinary function as ErrorHandler. If f is a function
// with the appropriate signature, ErrorHandlerFunc(f) is a
// ErrorHandler that calls f.
type ErrorHandlerFunc func(ctx context.Context, err error)
// Handle calls f(ctx, err).
func (f ErrorHandlerFunc) Handle(ctx context.Context, err error) {
f(ctx, err)
}
+209
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@@ -0,0 +1,209 @@
package http
import (
"bytes"
"context"
"encoding/json"
"encoding/xml"
"io"
"io/ioutil"
"net/http"
"net/url"
"github.com/go-kit/kit/endpoint"
)
// HTTPClient is an interface that models *http.Client.
type HTTPClient interface {
Do(req *http.Request) (*http.Response, error)
}
// Client wraps a URL and provides a method that implements endpoint.Endpoint.
type Client struct {
client HTTPClient
method string
tgt *url.URL
enc EncodeRequestFunc
dec DecodeResponseFunc
before []RequestFunc
after []ClientResponseFunc
finalizer []ClientFinalizerFunc
bufferedStream bool
}
// NewClient constructs a usable Client for a single remote method.
func NewClient(
method string,
tgt *url.URL,
enc EncodeRequestFunc,
dec DecodeResponseFunc,
options ...ClientOption,
) *Client {
c := &Client{
client: http.DefaultClient,
method: method,
tgt: tgt,
enc: enc,
dec: dec,
before: []RequestFunc{},
after: []ClientResponseFunc{},
bufferedStream: false,
}
for _, option := range options {
option(c)
}
return c
}
// ClientOption sets an optional parameter for clients.
type ClientOption func(*Client)
// SetClient sets the underlying HTTP client used for requests.
// By default, http.DefaultClient is used.
func SetClient(client HTTPClient) ClientOption {
return func(c *Client) { c.client = client }
}
// ClientBefore sets the RequestFuncs that are applied to the outgoing HTTP
// request before it's invoked.
func ClientBefore(before ...RequestFunc) ClientOption {
return func(c *Client) { c.before = append(c.before, before...) }
}
// ClientAfter sets the ClientResponseFuncs applied to the incoming HTTP
// request prior to it being decoded. This is useful for obtaining anything off
// of the response and adding onto the context prior to decoding.
func ClientAfter(after ...ClientResponseFunc) ClientOption {
return func(c *Client) { c.after = append(c.after, after...) }
}
// ClientFinalizer is executed at the end of every HTTP request.
// By default, no finalizer is registered.
func ClientFinalizer(f ...ClientFinalizerFunc) ClientOption {
return func(s *Client) { s.finalizer = append(s.finalizer, f...) }
}
// BufferedStream sets whether the Response.Body is left open, allowing it
// to be read from later. Useful for transporting a file as a buffered stream.
// That body has to be Closed to propery end the request.
func BufferedStream(buffered bool) ClientOption {
return func(c *Client) { c.bufferedStream = buffered }
}
// Endpoint returns a usable endpoint that invokes the remote endpoint.
func (c Client) Endpoint() endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (interface{}, error) {
ctx, cancel := context.WithCancel(ctx)
var (
resp *http.Response
err error
)
if c.finalizer != nil {
defer func() {
if resp != nil {
ctx = context.WithValue(ctx, ContextKeyResponseHeaders, resp.Header)
ctx = context.WithValue(ctx, ContextKeyResponseSize, resp.ContentLength)
}
for _, f := range c.finalizer {
f(ctx, err)
}
}()
}
req, err := http.NewRequest(c.method, c.tgt.String(), nil)
if err != nil {
cancel()
return nil, err
}
if err = c.enc(ctx, req, request); err != nil {
cancel()
return nil, err
}
for _, f := range c.before {
ctx = f(ctx, req)
}
resp, err = c.client.Do(req.WithContext(ctx))
if err != nil {
cancel()
return nil, err
}
// If we expect a buffered stream, we don't cancel the context when the endpoint returns.
// Instead, we should call the cancel func when closing the response body.
if c.bufferedStream {
resp.Body = bodyWithCancel{ReadCloser: resp.Body, cancel: cancel}
} else {
defer resp.Body.Close()
defer cancel()
}
for _, f := range c.after {
ctx = f(ctx, resp)
}
response, err := c.dec(ctx, resp)
if err != nil {
return nil, err
}
return response, nil
}
}
// bodyWithCancel is a wrapper for an io.ReadCloser with also a
// cancel function which is called when the Close is used
type bodyWithCancel struct {
io.ReadCloser
cancel context.CancelFunc
}
func (bwc bodyWithCancel) Close() error {
bwc.ReadCloser.Close()
bwc.cancel()
return nil
}
// ClientFinalizerFunc can be used to perform work at the end of a client HTTP
// request, after the response is returned. The principal
// intended use is for error logging. Additional response parameters are
// provided in the context under keys with the ContextKeyResponse prefix.
// Note: err may be nil. There maybe also no additional response parameters
// depending on when an error occurs.
type ClientFinalizerFunc func(ctx context.Context, err error)
// EncodeJSONRequest is an EncodeRequestFunc that serializes the request as a
// JSON object to the Request body. Many JSON-over-HTTP services can use it as
// a sensible default. If the request implements Headerer, the provided headers
// will be applied to the request.
func EncodeJSONRequest(c context.Context, r *http.Request, request interface{}) error {
r.Header.Set("Content-Type", "application/json; charset=utf-8")
if headerer, ok := request.(Headerer); ok {
for k := range headerer.Headers() {
r.Header.Set(k, headerer.Headers().Get(k))
}
}
var b bytes.Buffer
r.Body = ioutil.NopCloser(&b)
return json.NewEncoder(&b).Encode(request)
}
// EncodeXMLRequest is an EncodeRequestFunc that serializes the request as a
// XML object to the Request body. If the request implements Headerer,
// the provided headers will be applied to the request.
func EncodeXMLRequest(c context.Context, r *http.Request, request interface{}) error {
r.Header.Set("Content-Type", "text/xml; charset=utf-8")
if headerer, ok := request.(Headerer); ok {
for k := range headerer.Headers() {
r.Header.Set(k, headerer.Headers().Get(k))
}
}
var b bytes.Buffer
r.Body = ioutil.NopCloser(&b)
return xml.NewEncoder(&b).Encode(request)
}
+2
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@@ -0,0 +1,2 @@
// Package http provides a general purpose HTTP binding for endpoints.
package http
+30
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@@ -0,0 +1,30 @@
package http
import (
"context"
"net/http"
)
// DecodeRequestFunc extracts a user-domain request object from an HTTP
// request object. It's designed to be used in HTTP servers, for server-side
// endpoints. One straightforward DecodeRequestFunc could be something that
// JSON decodes from the request body to the concrete request type.
type DecodeRequestFunc func(context.Context, *http.Request) (request interface{}, err error)
// EncodeRequestFunc encodes the passed request object into the HTTP request
// object. It's designed to be used in HTTP clients, for client-side
// endpoints. One straightforward EncodeRequestFunc could be something that JSON
// encodes the object directly to the request body.
type EncodeRequestFunc func(context.Context, *http.Request, interface{}) error
// EncodeResponseFunc encodes the passed response object to the HTTP response
// writer. It's designed to be used in HTTP servers, for server-side
// endpoints. One straightforward EncodeResponseFunc could be something that
// JSON encodes the object directly to the response body.
type EncodeResponseFunc func(context.Context, http.ResponseWriter, interface{}) error
// DecodeResponseFunc extracts a user-domain response object from an HTTP
// response object. It's designed to be used in HTTP clients, for client-side
// endpoints. One straightforward DecodeResponseFunc could be something that
// JSON decodes from the response body to the concrete response type.
type DecodeResponseFunc func(context.Context, *http.Response) (response interface{}, err error)
+133
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@@ -0,0 +1,133 @@
package http
import (
"context"
"net/http"
)
// RequestFunc may take information from an HTTP request and put it into a
// request context. In Servers, RequestFuncs are executed prior to invoking the
// endpoint. In Clients, RequestFuncs are executed after creating the request
// but prior to invoking the HTTP client.
type RequestFunc func(context.Context, *http.Request) context.Context
// ServerResponseFunc may take information from a request context and use it to
// manipulate a ResponseWriter. ServerResponseFuncs are only executed in
// servers, after invoking the endpoint but prior to writing a response.
type ServerResponseFunc func(context.Context, http.ResponseWriter) context.Context
// ClientResponseFunc may take information from an HTTP request and make the
// response available for consumption. ClientResponseFuncs are only executed in
// clients, after a request has been made, but prior to it being decoded.
type ClientResponseFunc func(context.Context, *http.Response) context.Context
// SetContentType returns a ServerResponseFunc that sets the Content-Type header
// to the provided value.
func SetContentType(contentType string) ServerResponseFunc {
return SetResponseHeader("Content-Type", contentType)
}
// SetResponseHeader returns a ServerResponseFunc that sets the given header.
func SetResponseHeader(key, val string) ServerResponseFunc {
return func(ctx context.Context, w http.ResponseWriter) context.Context {
w.Header().Set(key, val)
return ctx
}
}
// SetRequestHeader returns a RequestFunc that sets the given header.
func SetRequestHeader(key, val string) RequestFunc {
return func(ctx context.Context, r *http.Request) context.Context {
r.Header.Set(key, val)
return ctx
}
}
// PopulateRequestContext is a RequestFunc that populates several values into
// the context from the HTTP request. Those values may be extracted using the
// corresponding ContextKey type in this package.
func PopulateRequestContext(ctx context.Context, r *http.Request) context.Context {
for k, v := range map[contextKey]string{
ContextKeyRequestMethod: r.Method,
ContextKeyRequestURI: r.RequestURI,
ContextKeyRequestPath: r.URL.Path,
ContextKeyRequestProto: r.Proto,
ContextKeyRequestHost: r.Host,
ContextKeyRequestRemoteAddr: r.RemoteAddr,
ContextKeyRequestXForwardedFor: r.Header.Get("X-Forwarded-For"),
ContextKeyRequestXForwardedProto: r.Header.Get("X-Forwarded-Proto"),
ContextKeyRequestAuthorization: r.Header.Get("Authorization"),
ContextKeyRequestReferer: r.Header.Get("Referer"),
ContextKeyRequestUserAgent: r.Header.Get("User-Agent"),
ContextKeyRequestXRequestID: r.Header.Get("X-Request-Id"),
ContextKeyRequestAccept: r.Header.Get("Accept"),
} {
ctx = context.WithValue(ctx, k, v)
}
return ctx
}
type contextKey int
const (
// ContextKeyRequestMethod is populated in the context by
// PopulateRequestContext. Its value is r.Method.
ContextKeyRequestMethod contextKey = iota
// ContextKeyRequestURI is populated in the context by
// PopulateRequestContext. Its value is r.RequestURI.
ContextKeyRequestURI
// ContextKeyRequestPath is populated in the context by
// PopulateRequestContext. Its value is r.URL.Path.
ContextKeyRequestPath
// ContextKeyRequestProto is populated in the context by
// PopulateRequestContext. Its value is r.Proto.
ContextKeyRequestProto
// ContextKeyRequestHost is populated in the context by
// PopulateRequestContext. Its value is r.Host.
ContextKeyRequestHost
// ContextKeyRequestRemoteAddr is populated in the context by
// PopulateRequestContext. Its value is r.RemoteAddr.
ContextKeyRequestRemoteAddr
// ContextKeyRequestXForwardedFor is populated in the context by
// PopulateRequestContext. Its value is r.Header.Get("X-Forwarded-For").
ContextKeyRequestXForwardedFor
// ContextKeyRequestXForwardedProto is populated in the context by
// PopulateRequestContext. Its value is r.Header.Get("X-Forwarded-Proto").
ContextKeyRequestXForwardedProto
// ContextKeyRequestAuthorization is populated in the context by
// PopulateRequestContext. Its value is r.Header.Get("Authorization").
ContextKeyRequestAuthorization
// ContextKeyRequestReferer is populated in the context by
// PopulateRequestContext. Its value is r.Header.Get("Referer").
ContextKeyRequestReferer
// ContextKeyRequestUserAgent is populated in the context by
// PopulateRequestContext. Its value is r.Header.Get("User-Agent").
ContextKeyRequestUserAgent
// ContextKeyRequestXRequestID is populated in the context by
// PopulateRequestContext. Its value is r.Header.Get("X-Request-Id").
ContextKeyRequestXRequestID
// ContextKeyRequestAccept is populated in the context by
// PopulateRequestContext. Its value is r.Header.Get("Accept").
ContextKeyRequestAccept
// ContextKeyResponseHeaders is populated in the context whenever a
// ServerFinalizerFunc is specified. Its value is of type http.Header, and
// is captured only once the entire response has been written.
ContextKeyResponseHeaders
// ContextKeyResponseSize is populated in the context whenever a
// ServerFinalizerFunc is specified. Its value is of type int64.
ContextKeyResponseSize
)
+244
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@@ -0,0 +1,244 @@
package http
import (
"context"
"encoding/json"
"net/http"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/transport"
)
// Server wraps an endpoint and implements http.Handler.
type Server struct {
e endpoint.Endpoint
dec DecodeRequestFunc
enc EncodeResponseFunc
before []RequestFunc
after []ServerResponseFunc
errorEncoder ErrorEncoder
finalizer []ServerFinalizerFunc
errorHandler transport.ErrorHandler
}
// NewServer constructs a new server, which implements http.Handler and wraps
// the provided endpoint.
func NewServer(
e endpoint.Endpoint,
dec DecodeRequestFunc,
enc EncodeResponseFunc,
options ...ServerOption,
) *Server {
s := &Server{
e: e,
dec: dec,
enc: enc,
errorEncoder: DefaultErrorEncoder,
errorHandler: transport.NewLogErrorHandler(log.NewNopLogger()),
}
for _, option := range options {
option(s)
}
return s
}
// ServerOption sets an optional parameter for servers.
type ServerOption func(*Server)
// ServerBefore functions are executed on the HTTP request object before the
// request is decoded.
func ServerBefore(before ...RequestFunc) ServerOption {
return func(s *Server) { s.before = append(s.before, before...) }
}
// ServerAfter functions are executed on the HTTP response writer after the
// endpoint is invoked, but before anything is written to the client.
func ServerAfter(after ...ServerResponseFunc) ServerOption {
return func(s *Server) { s.after = append(s.after, after...) }
}
// ServerErrorEncoder is used to encode errors to the http.ResponseWriter
// whenever they're encountered in the processing of a request. Clients can
// use this to provide custom error formatting and response codes. By default,
// errors will be written with the DefaultErrorEncoder.
func ServerErrorEncoder(ee ErrorEncoder) ServerOption {
return func(s *Server) { s.errorEncoder = ee }
}
// ServerErrorLogger is used to log non-terminal errors. By default, no errors
// are logged. This is intended as a diagnostic measure. Finer-grained control
// of error handling, including logging in more detail, should be performed in a
// custom ServerErrorEncoder or ServerFinalizer, both of which have access to
// the context.
// Deprecated: Use ServerErrorHandler instead.
func ServerErrorLogger(logger log.Logger) ServerOption {
return func(s *Server) { s.errorHandler = transport.NewLogErrorHandler(logger) }
}
// ServerErrorHandler is used to handle non-terminal errors. By default, non-terminal errors
// are ignored. This is intended as a diagnostic measure. Finer-grained control
// of error handling, including logging in more detail, should be performed in a
// custom ServerErrorEncoder or ServerFinalizer, both of which have access to
// the context.
func ServerErrorHandler(errorHandler transport.ErrorHandler) ServerOption {
return func(s *Server) { s.errorHandler = errorHandler }
}
// ServerFinalizer is executed at the end of every HTTP request.
// By default, no finalizer is registered.
func ServerFinalizer(f ...ServerFinalizerFunc) ServerOption {
return func(s *Server) { s.finalizer = append(s.finalizer, f...) }
}
// ServeHTTP implements http.Handler.
func (s Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
if len(s.finalizer) > 0 {
iw := &interceptingWriter{w, http.StatusOK, 0}
defer func() {
ctx = context.WithValue(ctx, ContextKeyResponseHeaders, iw.Header())
ctx = context.WithValue(ctx, ContextKeyResponseSize, iw.written)
for _, f := range s.finalizer {
f(ctx, iw.code, r)
}
}()
w = iw
}
for _, f := range s.before {
ctx = f(ctx, r)
}
request, err := s.dec(ctx, r)
if err != nil {
s.errorHandler.Handle(ctx, err)
s.errorEncoder(ctx, err, w)
return
}
response, err := s.e(ctx, request)
if err != nil {
s.errorHandler.Handle(ctx, err)
s.errorEncoder(ctx, err, w)
return
}
for _, f := range s.after {
ctx = f(ctx, w)
}
if err := s.enc(ctx, w, response); err != nil {
s.errorHandler.Handle(ctx, err)
s.errorEncoder(ctx, err, w)
return
}
}
// ErrorEncoder is responsible for encoding an error to the ResponseWriter.
// Users are encouraged to use custom ErrorEncoders to encode HTTP errors to
// their clients, and will likely want to pass and check for their own error
// types. See the example shipping/handling service.
type ErrorEncoder func(ctx context.Context, err error, w http.ResponseWriter)
// ServerFinalizerFunc can be used to perform work at the end of an HTTP
// request, after the response has been written to the client. The principal
// intended use is for request logging. In addition to the response code
// provided in the function signature, additional response parameters are
// provided in the context under keys with the ContextKeyResponse prefix.
type ServerFinalizerFunc func(ctx context.Context, code int, r *http.Request)
// NopRequestDecoder is a DecodeRequestFunc that can be used for requests that do not
// need to be decoded, and simply returns nil, nil.
func NopRequestDecoder(ctx context.Context, r *http.Request) (interface{}, error) {
return nil, nil
}
// EncodeJSONResponse is a EncodeResponseFunc that serializes the response as a
// JSON object to the ResponseWriter. Many JSON-over-HTTP services can use it as
// a sensible default. If the response implements Headerer, the provided headers
// will be applied to the response. If the response implements StatusCoder, the
// provided StatusCode will be used instead of 200.
func EncodeJSONResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if headerer, ok := response.(Headerer); ok {
for k, values := range headerer.Headers() {
for _, v := range values {
w.Header().Add(k, v)
}
}
}
code := http.StatusOK
if sc, ok := response.(StatusCoder); ok {
code = sc.StatusCode()
}
w.WriteHeader(code)
if code == http.StatusNoContent {
return nil
}
return json.NewEncoder(w).Encode(response)
}
// DefaultErrorEncoder writes the error to the ResponseWriter, by default a
// content type of text/plain, a body of the plain text of the error, and a
// status code of 500. If the error implements Headerer, the provided headers
// will be applied to the response. If the error implements json.Marshaler, and
// the marshaling succeeds, a content type of application/json and the JSON
// encoded form of the error will be used. If the error implements StatusCoder,
// the provided StatusCode will be used instead of 500.
func DefaultErrorEncoder(_ context.Context, err error, w http.ResponseWriter) {
contentType, body := "text/plain; charset=utf-8", []byte(err.Error())
if marshaler, ok := err.(json.Marshaler); ok {
if jsonBody, marshalErr := marshaler.MarshalJSON(); marshalErr == nil {
contentType, body = "application/json; charset=utf-8", jsonBody
}
}
w.Header().Set("Content-Type", contentType)
if headerer, ok := err.(Headerer); ok {
for k, values := range headerer.Headers() {
for _, v := range values {
w.Header().Add(k, v)
}
}
}
code := http.StatusInternalServerError
if sc, ok := err.(StatusCoder); ok {
code = sc.StatusCode()
}
w.WriteHeader(code)
w.Write(body)
}
// StatusCoder is checked by DefaultErrorEncoder. If an error value implements
// StatusCoder, the StatusCode will be used when encoding the error. By default,
// StatusInternalServerError (500) is used.
type StatusCoder interface {
StatusCode() int
}
// Headerer is checked by DefaultErrorEncoder. If an error value implements
// Headerer, the provided headers will be applied to the response writer, after
// the Content-Type is set.
type Headerer interface {
Headers() http.Header
}
type interceptingWriter struct {
http.ResponseWriter
code int
written int64
}
// WriteHeader may not be explicitly called, so care must be taken to
// initialize w.code to its default value of http.StatusOK.
func (w *interceptingWriter) WriteHeader(code int) {
w.code = code
w.ResponseWriter.WriteHeader(code)
}
func (w *interceptingWriter) Write(p []byte) (int, error) {
n, err := w.ResponseWriter.Write(p)
w.written += int64(n)
return n, err
}
+1
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@@ -0,0 +1 @@
.vscode/
+18
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@@ -0,0 +1,18 @@
language: go
sudo: false
go:
- "1.7.x"
- "1.8.x"
- "1.9.x"
- "1.10.x"
- "1.11.x"
- "1.12.x"
- "1.13.x"
- "tip"
before_install:
- go get github.com/mattn/goveralls
- go get golang.org/x/tools/cmd/cover
script:
- goveralls -service=travis-ci
+48
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@@ -0,0 +1,48 @@
# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [0.5.0] - 2020-01-03
### Changed
- Remove the dependency on github.com/kr/logfmt by [@ChrisHines]
- Move fuzz code to github.com/go-logfmt/fuzzlogfmt by [@ChrisHines]
## [0.4.0] - 2018-11-21
### Added
- Go module support by [@ChrisHines]
- CHANGELOG by [@ChrisHines]
### Changed
- Drop invalid runes from keys instead of returning ErrInvalidKey by [@ChrisHines]
- On panic while printing, attempt to print panic value by [@bboreham]
## [0.3.0] - 2016-11-15
### Added
- Pool buffers for quoted strings and byte slices by [@nussjustin]
### Fixed
- Fuzz fix, quote invalid UTF-8 values by [@judwhite]
## [0.2.0] - 2016-05-08
### Added
- Encoder.EncodeKeyvals by [@ChrisHines]
## [0.1.0] - 2016-03-28
### Added
- Encoder by [@ChrisHines]
- Decoder by [@ChrisHines]
- MarshalKeyvals by [@ChrisHines]
[0.5.0]: https://github.com/go-logfmt/logfmt/compare/v0.4.0...v0.5.0
[0.4.0]: https://github.com/go-logfmt/logfmt/compare/v0.3.0...v0.4.0
[0.3.0]: https://github.com/go-logfmt/logfmt/compare/v0.2.0...v0.3.0
[0.2.0]: https://github.com/go-logfmt/logfmt/compare/v0.1.0...v0.2.0
[0.1.0]: https://github.com/go-logfmt/logfmt/commits/v0.1.0
[@ChrisHines]: https://github.com/ChrisHines
[@bboreham]: https://github.com/bboreham
[@judwhite]: https://github.com/judwhite
[@nussjustin]: https://github.com/nussjustin
+22
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@@ -0,0 +1,22 @@
The MIT License (MIT)
Copyright (c) 2015 go-logfmt
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
+33
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@@ -0,0 +1,33 @@
[![GoDoc](https://godoc.org/github.com/go-logfmt/logfmt?status.svg)](https://godoc.org/github.com/go-logfmt/logfmt)
[![Go Report Card](https://goreportcard.com/badge/go-logfmt/logfmt)](https://goreportcard.com/report/go-logfmt/logfmt)
[![TravisCI](https://travis-ci.org/go-logfmt/logfmt.svg?branch=master)](https://travis-ci.org/go-logfmt/logfmt)
[![Coverage Status](https://coveralls.io/repos/github/go-logfmt/logfmt/badge.svg?branch=master)](https://coveralls.io/github/go-logfmt/logfmt?branch=master)
# logfmt
Package logfmt implements utilities to marshal and unmarshal data in the [logfmt
format](https://brandur.org/logfmt). It provides an API similar to
[encoding/json](http://golang.org/pkg/encoding/json/) and
[encoding/xml](http://golang.org/pkg/encoding/xml/).
The logfmt format was first documented by Brandur Leach in [this
article](https://brandur.org/logfmt). The format has not been formally
standardized. The most authoritative public specification to date has been the
documentation of a Go Language [package](http://godoc.org/github.com/kr/logfmt)
written by Blake Mizerany and Keith Rarick.
## Goals
This project attempts to conform as closely as possible to the prior art, while
also removing ambiguity where necessary to provide well behaved encoder and
decoder implementations.
## Non-goals
This project does not attempt to formally standardize the logfmt format. In the
event that logfmt is standardized this project would take conforming to the
standard as a goal.
## Versioning
Package logfmt publishes releases via [semver](http://semver.org/) compatible Git tags prefixed with a single 'v'.
+237
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package logfmt
import (
"bufio"
"bytes"
"fmt"
"io"
"unicode/utf8"
)
// A Decoder reads and decodes logfmt records from an input stream.
type Decoder struct {
pos int
key []byte
value []byte
lineNum int
s *bufio.Scanner
err error
}
// NewDecoder returns a new decoder that reads from r.
//
// The decoder introduces its own buffering and may read data from r beyond
// the logfmt records requested.
func NewDecoder(r io.Reader) *Decoder {
dec := &Decoder{
s: bufio.NewScanner(r),
}
return dec
}
// ScanRecord advances the Decoder to the next record, which can then be
// parsed with the ScanKeyval method. It returns false when decoding stops,
// either by reaching the end of the input or an error. After ScanRecord
// returns false, the Err method will return any error that occurred during
// decoding, except that if it was io.EOF, Err will return nil.
func (dec *Decoder) ScanRecord() bool {
if dec.err != nil {
return false
}
if !dec.s.Scan() {
dec.err = dec.s.Err()
return false
}
dec.lineNum++
dec.pos = 0
return true
}
// ScanKeyval advances the Decoder to the next key/value pair of the current
// record, which can then be retrieved with the Key and Value methods. It
// returns false when decoding stops, either by reaching the end of the
// current record or an error.
func (dec *Decoder) ScanKeyval() bool {
dec.key, dec.value = nil, nil
if dec.err != nil {
return false
}
line := dec.s.Bytes()
// garbage
for p, c := range line[dec.pos:] {
if c > ' ' {
dec.pos += p
goto key
}
}
dec.pos = len(line)
return false
key:
const invalidKeyError = "invalid key"
start, multibyte := dec.pos, false
for p, c := range line[dec.pos:] {
switch {
case c == '=':
dec.pos += p
if dec.pos > start {
dec.key = line[start:dec.pos]
if multibyte && bytes.ContainsRune(dec.key, utf8.RuneError) {
dec.syntaxError(invalidKeyError)
return false
}
}
if dec.key == nil {
dec.unexpectedByte(c)
return false
}
goto equal
case c == '"':
dec.pos += p
dec.unexpectedByte(c)
return false
case c <= ' ':
dec.pos += p
if dec.pos > start {
dec.key = line[start:dec.pos]
if multibyte && bytes.ContainsRune(dec.key, utf8.RuneError) {
dec.syntaxError(invalidKeyError)
return false
}
}
return true
case c >= utf8.RuneSelf:
multibyte = true
}
}
dec.pos = len(line)
if dec.pos > start {
dec.key = line[start:dec.pos]
if multibyte && bytes.ContainsRune(dec.key, utf8.RuneError) {
dec.syntaxError(invalidKeyError)
return false
}
}
return true
equal:
dec.pos++
if dec.pos >= len(line) {
return true
}
switch c := line[dec.pos]; {
case c <= ' ':
return true
case c == '"':
goto qvalue
}
// value
start = dec.pos
for p, c := range line[dec.pos:] {
switch {
case c == '=' || c == '"':
dec.pos += p
dec.unexpectedByte(c)
return false
case c <= ' ':
dec.pos += p
if dec.pos > start {
dec.value = line[start:dec.pos]
}
return true
}
}
dec.pos = len(line)
if dec.pos > start {
dec.value = line[start:dec.pos]
}
return true
qvalue:
const (
untermQuote = "unterminated quoted value"
invalidQuote = "invalid quoted value"
)
hasEsc, esc := false, false
start = dec.pos
for p, c := range line[dec.pos+1:] {
switch {
case esc:
esc = false
case c == '\\':
hasEsc, esc = true, true
case c == '"':
dec.pos += p + 2
if hasEsc {
v, ok := unquoteBytes(line[start:dec.pos])
if !ok {
dec.syntaxError(invalidQuote)
return false
}
dec.value = v
} else {
start++
end := dec.pos - 1
if end > start {
dec.value = line[start:end]
}
}
return true
}
}
dec.pos = len(line)
dec.syntaxError(untermQuote)
return false
}
// Key returns the most recent key found by a call to ScanKeyval. The returned
// slice may point to internal buffers and is only valid until the next call
// to ScanRecord. It does no allocation.
func (dec *Decoder) Key() []byte {
return dec.key
}
// Value returns the most recent value found by a call to ScanKeyval. The
// returned slice may point to internal buffers and is only valid until the
// next call to ScanRecord. It does no allocation when the value has no
// escape sequences.
func (dec *Decoder) Value() []byte {
return dec.value
}
// Err returns the first non-EOF error that was encountered by the Scanner.
func (dec *Decoder) Err() error {
return dec.err
}
func (dec *Decoder) syntaxError(msg string) {
dec.err = &SyntaxError{
Msg: msg,
Line: dec.lineNum,
Pos: dec.pos + 1,
}
}
func (dec *Decoder) unexpectedByte(c byte) {
dec.err = &SyntaxError{
Msg: fmt.Sprintf("unexpected %q", c),
Line: dec.lineNum,
Pos: dec.pos + 1,
}
}
// A SyntaxError represents a syntax error in the logfmt input stream.
type SyntaxError struct {
Msg string
Line int
Pos int
}
func (e *SyntaxError) Error() string {
return fmt.Sprintf("logfmt syntax error at pos %d on line %d: %s", e.Pos, e.Line, e.Msg)
}
+6
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@@ -0,0 +1,6 @@
// Package logfmt implements utilities to marshal and unmarshal data in the
// logfmt format. The logfmt format records key/value pairs in a way that
// balances readability for humans and simplicity of computer parsing. It is
// most commonly used as a more human friendly alternative to JSON for
// structured logging.
package logfmt
+322
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@@ -0,0 +1,322 @@
package logfmt
import (
"bytes"
"encoding"
"errors"
"fmt"
"io"
"reflect"
"strings"
"unicode/utf8"
)
// MarshalKeyvals returns the logfmt encoding of keyvals, a variadic sequence
// of alternating keys and values.
func MarshalKeyvals(keyvals ...interface{}) ([]byte, error) {
buf := &bytes.Buffer{}
if err := NewEncoder(buf).EncodeKeyvals(keyvals...); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// An Encoder writes logfmt data to an output stream.
type Encoder struct {
w io.Writer
scratch bytes.Buffer
needSep bool
}
// NewEncoder returns a new encoder that writes to w.
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{
w: w,
}
}
var (
space = []byte(" ")
equals = []byte("=")
newline = []byte("\n")
null = []byte("null")
)
// EncodeKeyval writes the logfmt encoding of key and value to the stream. A
// single space is written before the second and subsequent keys in a record.
// Nothing is written if a non-nil error is returned.
func (enc *Encoder) EncodeKeyval(key, value interface{}) error {
enc.scratch.Reset()
if enc.needSep {
if _, err := enc.scratch.Write(space); err != nil {
return err
}
}
if err := writeKey(&enc.scratch, key); err != nil {
return err
}
if _, err := enc.scratch.Write(equals); err != nil {
return err
}
if err := writeValue(&enc.scratch, value); err != nil {
return err
}
_, err := enc.w.Write(enc.scratch.Bytes())
enc.needSep = true
return err
}
// EncodeKeyvals writes the logfmt encoding of keyvals to the stream. Keyvals
// is a variadic sequence of alternating keys and values. Keys of unsupported
// type are skipped along with their corresponding value. Values of
// unsupported type or that cause a MarshalerError are replaced by their error
// but do not cause EncodeKeyvals to return an error. If a non-nil error is
// returned some key/value pairs may not have be written.
func (enc *Encoder) EncodeKeyvals(keyvals ...interface{}) error {
if len(keyvals) == 0 {
return nil
}
if len(keyvals)%2 == 1 {
keyvals = append(keyvals, nil)
}
for i := 0; i < len(keyvals); i += 2 {
k, v := keyvals[i], keyvals[i+1]
err := enc.EncodeKeyval(k, v)
if err == ErrUnsupportedKeyType {
continue
}
if _, ok := err.(*MarshalerError); ok || err == ErrUnsupportedValueType {
v = err
err = enc.EncodeKeyval(k, v)
}
if err != nil {
return err
}
}
return nil
}
// MarshalerError represents an error encountered while marshaling a value.
type MarshalerError struct {
Type reflect.Type
Err error
}
func (e *MarshalerError) Error() string {
return "error marshaling value of type " + e.Type.String() + ": " + e.Err.Error()
}
// ErrNilKey is returned by Marshal functions and Encoder methods if a key is
// a nil interface or pointer value.
var ErrNilKey = errors.New("nil key")
// ErrInvalidKey is returned by Marshal functions and Encoder methods if, after
// dropping invalid runes, a key is empty.
var ErrInvalidKey = errors.New("invalid key")
// ErrUnsupportedKeyType is returned by Encoder methods if a key has an
// unsupported type.
var ErrUnsupportedKeyType = errors.New("unsupported key type")
// ErrUnsupportedValueType is returned by Encoder methods if a value has an
// unsupported type.
var ErrUnsupportedValueType = errors.New("unsupported value type")
func writeKey(w io.Writer, key interface{}) error {
if key == nil {
return ErrNilKey
}
switch k := key.(type) {
case string:
return writeStringKey(w, k)
case []byte:
if k == nil {
return ErrNilKey
}
return writeBytesKey(w, k)
case encoding.TextMarshaler:
kb, err := safeMarshal(k)
if err != nil {
return err
}
if kb == nil {
return ErrNilKey
}
return writeBytesKey(w, kb)
case fmt.Stringer:
ks, ok := safeString(k)
if !ok {
return ErrNilKey
}
return writeStringKey(w, ks)
default:
rkey := reflect.ValueOf(key)
switch rkey.Kind() {
case reflect.Array, reflect.Chan, reflect.Func, reflect.Map, reflect.Slice, reflect.Struct:
return ErrUnsupportedKeyType
case reflect.Ptr:
if rkey.IsNil() {
return ErrNilKey
}
return writeKey(w, rkey.Elem().Interface())
}
return writeStringKey(w, fmt.Sprint(k))
}
}
// keyRuneFilter returns r for all valid key runes, and -1 for all invalid key
// runes. When used as the mapping function for strings.Map and bytes.Map
// functions it causes them to remove invalid key runes from strings or byte
// slices respectively.
func keyRuneFilter(r rune) rune {
if r <= ' ' || r == '=' || r == '"' || r == utf8.RuneError {
return -1
}
return r
}
func writeStringKey(w io.Writer, key string) error {
k := strings.Map(keyRuneFilter, key)
if k == "" {
return ErrInvalidKey
}
_, err := io.WriteString(w, k)
return err
}
func writeBytesKey(w io.Writer, key []byte) error {
k := bytes.Map(keyRuneFilter, key)
if len(k) == 0 {
return ErrInvalidKey
}
_, err := w.Write(k)
return err
}
func writeValue(w io.Writer, value interface{}) error {
switch v := value.(type) {
case nil:
return writeBytesValue(w, null)
case string:
return writeStringValue(w, v, true)
case []byte:
return writeBytesValue(w, v)
case encoding.TextMarshaler:
vb, err := safeMarshal(v)
if err != nil {
return err
}
if vb == nil {
vb = null
}
return writeBytesValue(w, vb)
case error:
se, ok := safeError(v)
return writeStringValue(w, se, ok)
case fmt.Stringer:
ss, ok := safeString(v)
return writeStringValue(w, ss, ok)
default:
rvalue := reflect.ValueOf(value)
switch rvalue.Kind() {
case reflect.Array, reflect.Chan, reflect.Func, reflect.Map, reflect.Slice, reflect.Struct:
return ErrUnsupportedValueType
case reflect.Ptr:
if rvalue.IsNil() {
return writeBytesValue(w, null)
}
return writeValue(w, rvalue.Elem().Interface())
}
return writeStringValue(w, fmt.Sprint(v), true)
}
}
func needsQuotedValueRune(r rune) bool {
return r <= ' ' || r == '=' || r == '"' || r == utf8.RuneError
}
func writeStringValue(w io.Writer, value string, ok bool) error {
var err error
if ok && value == "null" {
_, err = io.WriteString(w, `"null"`)
} else if strings.IndexFunc(value, needsQuotedValueRune) != -1 {
_, err = writeQuotedString(w, value)
} else {
_, err = io.WriteString(w, value)
}
return err
}
func writeBytesValue(w io.Writer, value []byte) error {
var err error
if bytes.IndexFunc(value, needsQuotedValueRune) != -1 {
_, err = writeQuotedBytes(w, value)
} else {
_, err = w.Write(value)
}
return err
}
// EndRecord writes a newline character to the stream and resets the encoder
// to the beginning of a new record.
func (enc *Encoder) EndRecord() error {
_, err := enc.w.Write(newline)
if err == nil {
enc.needSep = false
}
return err
}
// Reset resets the encoder to the beginning of a new record.
func (enc *Encoder) Reset() {
enc.needSep = false
}
func safeError(err error) (s string, ok bool) {
defer func() {
if panicVal := recover(); panicVal != nil {
if v := reflect.ValueOf(err); v.Kind() == reflect.Ptr && v.IsNil() {
s, ok = "null", false
} else {
s, ok = fmt.Sprintf("PANIC:%v", panicVal), false
}
}
}()
s, ok = err.Error(), true
return
}
func safeString(str fmt.Stringer) (s string, ok bool) {
defer func() {
if panicVal := recover(); panicVal != nil {
if v := reflect.ValueOf(str); v.Kind() == reflect.Ptr && v.IsNil() {
s, ok = "null", false
} else {
s, ok = fmt.Sprintf("PANIC:%v", panicVal), true
}
}
}()
s, ok = str.String(), true
return
}
func safeMarshal(tm encoding.TextMarshaler) (b []byte, err error) {
defer func() {
if panicVal := recover(); panicVal != nil {
if v := reflect.ValueOf(tm); v.Kind() == reflect.Ptr && v.IsNil() {
b, err = nil, nil
} else {
b, err = nil, fmt.Errorf("panic when marshalling: %s", panicVal)
}
}
}()
b, err = tm.MarshalText()
if err != nil {
return nil, &MarshalerError{
Type: reflect.TypeOf(tm),
Err: err,
}
}
return
}
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module github.com/go-logfmt/logfmt
go 1.13
+277
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@@ -0,0 +1,277 @@
package logfmt
import (
"bytes"
"io"
"strconv"
"sync"
"unicode"
"unicode/utf16"
"unicode/utf8"
)
// Taken from Go's encoding/json and modified for use here.
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
var hex = "0123456789abcdef"
var bufferPool = sync.Pool{
New: func() interface{} {
return &bytes.Buffer{}
},
}
func getBuffer() *bytes.Buffer {
return bufferPool.Get().(*bytes.Buffer)
}
func poolBuffer(buf *bytes.Buffer) {
buf.Reset()
bufferPool.Put(buf)
}
// NOTE: keep in sync with writeQuotedBytes below.
func writeQuotedString(w io.Writer, s string) (int, error) {
buf := getBuffer()
buf.WriteByte('"')
start := 0
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
if 0x20 <= b && b != '\\' && b != '"' {
i++
continue
}
if start < i {
buf.WriteString(s[start:i])
}
switch b {
case '\\', '"':
buf.WriteByte('\\')
buf.WriteByte(b)
case '\n':
buf.WriteByte('\\')
buf.WriteByte('n')
case '\r':
buf.WriteByte('\\')
buf.WriteByte('r')
case '\t':
buf.WriteByte('\\')
buf.WriteByte('t')
default:
// This encodes bytes < 0x20 except for \n, \r, and \t.
buf.WriteString(`\u00`)
buf.WriteByte(hex[b>>4])
buf.WriteByte(hex[b&0xF])
}
i++
start = i
continue
}
c, size := utf8.DecodeRuneInString(s[i:])
if c == utf8.RuneError {
if start < i {
buf.WriteString(s[start:i])
}
buf.WriteString(`\ufffd`)
i += size
start = i
continue
}
i += size
}
if start < len(s) {
buf.WriteString(s[start:])
}
buf.WriteByte('"')
n, err := w.Write(buf.Bytes())
poolBuffer(buf)
return n, err
}
// NOTE: keep in sync with writeQuoteString above.
func writeQuotedBytes(w io.Writer, s []byte) (int, error) {
buf := getBuffer()
buf.WriteByte('"')
start := 0
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
if 0x20 <= b && b != '\\' && b != '"' {
i++
continue
}
if start < i {
buf.Write(s[start:i])
}
switch b {
case '\\', '"':
buf.WriteByte('\\')
buf.WriteByte(b)
case '\n':
buf.WriteByte('\\')
buf.WriteByte('n')
case '\r':
buf.WriteByte('\\')
buf.WriteByte('r')
case '\t':
buf.WriteByte('\\')
buf.WriteByte('t')
default:
// This encodes bytes < 0x20 except for \n, \r, and \t.
buf.WriteString(`\u00`)
buf.WriteByte(hex[b>>4])
buf.WriteByte(hex[b&0xF])
}
i++
start = i
continue
}
c, size := utf8.DecodeRune(s[i:])
if c == utf8.RuneError {
if start < i {
buf.Write(s[start:i])
}
buf.WriteString(`\ufffd`)
i += size
start = i
continue
}
i += size
}
if start < len(s) {
buf.Write(s[start:])
}
buf.WriteByte('"')
n, err := w.Write(buf.Bytes())
poolBuffer(buf)
return n, err
}
// getu4 decodes \uXXXX from the beginning of s, returning the hex value,
// or it returns -1.
func getu4(s []byte) rune {
if len(s) < 6 || s[0] != '\\' || s[1] != 'u' {
return -1
}
r, err := strconv.ParseUint(string(s[2:6]), 16, 64)
if err != nil {
return -1
}
return rune(r)
}
func unquoteBytes(s []byte) (t []byte, ok bool) {
if len(s) < 2 || s[0] != '"' || s[len(s)-1] != '"' {
return
}
s = s[1 : len(s)-1]
// Check for unusual characters. If there are none,
// then no unquoting is needed, so return a slice of the
// original bytes.
r := 0
for r < len(s) {
c := s[r]
if c == '\\' || c == '"' || c < ' ' {
break
}
if c < utf8.RuneSelf {
r++
continue
}
rr, size := utf8.DecodeRune(s[r:])
if rr == utf8.RuneError {
break
}
r += size
}
if r == len(s) {
return s, true
}
b := make([]byte, len(s)+2*utf8.UTFMax)
w := copy(b, s[0:r])
for r < len(s) {
// Out of room? Can only happen if s is full of
// malformed UTF-8 and we're replacing each
// byte with RuneError.
if w >= len(b)-2*utf8.UTFMax {
nb := make([]byte, (len(b)+utf8.UTFMax)*2)
copy(nb, b[0:w])
b = nb
}
switch c := s[r]; {
case c == '\\':
r++
if r >= len(s) {
return
}
switch s[r] {
default:
return
case '"', '\\', '/', '\'':
b[w] = s[r]
r++
w++
case 'b':
b[w] = '\b'
r++
w++
case 'f':
b[w] = '\f'
r++
w++
case 'n':
b[w] = '\n'
r++
w++
case 'r':
b[w] = '\r'
r++
w++
case 't':
b[w] = '\t'
r++
w++
case 'u':
r--
rr := getu4(s[r:])
if rr < 0 {
return
}
r += 6
if utf16.IsSurrogate(rr) {
rr1 := getu4(s[r:])
if dec := utf16.DecodeRune(rr, rr1); dec != unicode.ReplacementChar {
// A valid pair; consume.
r += 6
w += utf8.EncodeRune(b[w:], dec)
break
}
// Invalid surrogate; fall back to replacement rune.
rr = unicode.ReplacementChar
}
w += utf8.EncodeRune(b[w:], rr)
}
// Quote, control characters are invalid.
case c == '"', c < ' ':
return
// ASCII
case c < utf8.RuneSelf:
b[w] = c
r++
w++
// Coerce to well-formed UTF-8.
default:
rr, size := utf8.DecodeRune(s[r:])
r += size
w += utf8.EncodeRune(b[w:], rr)
}
}
return b[0:w], true
}
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tags
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language: go
go:
- tip
script:
- go test -v ./...
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## Changelog
#### Update 10 September 2016
- Add support for go1.7 net.Context
#### Update 25 September 2015
- Add support for Sub router
Example :
``` go
func main() {
mux := bone.New()
sub := mux.NewRouter()
sub.GetFunc("/test/example", func(rw http.ResponseWriter, req *http.Request) {
rw.Write([]byte("From sub router !"))
})
mux.SubRoute("/api", sub)
http.ListenAndServe(":8080", mux)
}
```
#### Update 26 April 2015
- Add Support for REGEX parameters, using ` # ` instead of ` : `.
- Add Mux method ` mux.GetFunc(), mux.PostFunc(), etc ... `, takes ` http.HandlerFunc ` instead of ` http.Handler `.
Example :
``` go
func main() {
mux.GetFunc("/route/#var^[a-z]$", handler)
}
func handler(rw http.ResponseWriter, req *http.Request) {
bone.GetValue(req, "var")
}
```
#### Update 29 january 2015
- Speed improvement for url Parameters, from ```~ 1500 ns/op ``` to ```~ 1000 ns/op ```.
#### Update 25 december 2014
After trying to find a way of using the default url.Query() for route parameters, i decide to change the way bone is dealing with this. url.Query() is too slow for good router performance.
So now to get the parameters value in your handler, you need to use
` bone.GetValue(req, key) ` instead of ` req.Url.Query().Get(key) `.
This change give a big speed improvement for every kind of application using route parameters, like ~80x faster ...
Really sorry for breaking things, but i think it's worth it.
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# Contributor Covenant Code of Conduct
## Our Pledge
In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
## Our Standards
Examples of behavior that contributes to creating a positive environment include:
* Using welcoming and inclusive language
* Being respectful of differing viewpoints and experiences
* Gracefully accepting constructive criticism
* Focusing on what is best for the community
* Showing empathy towards other community members
Examples of unacceptable behavior by participants include:
* The use of sexualized language or imagery and unwelcome sexual attention or advances
* Trolling, insulting/derogatory comments, and personal or political attacks
* Public or private harassment
* Publishing others' private information, such as a physical or electronic address, without explicit permission
* Other conduct which could reasonably be considered inappropriate in a professional setting
## Our Responsibilities
Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
## Scope
This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
## Enforcement
Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at piinky05@gmail.com. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
## Attribution
This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
[homepage]: http://contributor-covenant.org
[version]: http://contributor-covenant.org/version/1/4/
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## Contributing
1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Write Tests!
4. Commit your changes (git commit -am 'Add some feature')
5. Push to the branch (git push origin my-new-feature)
6. Create new Pull Request
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The MIT License (MIT)
Copyright (c) 2014 CodingFerret
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, Subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or Substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
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bone [![GoDoc](https://godoc.org/github.com/squiidz/bone?status.png)](http://godoc.org/github.com/go-zoo/bone) [![Build Status](https://travis-ci.org/go-zoo/bone.svg)](https://travis-ci.org/go-zoo/bone) [![Go Report Card](https://goreportcard.com/badge/go-zoo/bone)](https://goreportcard.com/report/go-zoo/bone)
=======
## What is bone ?
Bone is a lightweight and lightning fast HTTP Multiplexer for Golang. It support :
- URL Parameters
- REGEX Parameters
- Wildcard routes
- Router Prefix
- Route params validators
- Sub Router, `mux.SubRoute()`, support most standard router (bone, gorilla/mux, httpRouter etc...)
- Http method declaration
- Support for `http.Handler` and `http.HandlerFunc`
- Custom NotFound handler
- Respect the Go standard `http.Handler` interface
![alt tag](https://c2.staticflickr.com/2/1070/540747396_5542b42cca_z.jpg)
## Speed
```
- BenchmarkBoneMux 10000000 118 ns/op
- BenchmarkZeusMux 100000 144 ns/op
- BenchmarkHttpRouterMux 10000000 134 ns/op
- BenchmarkNetHttpMux 3000000 580 ns/op
- BenchmarkGorillaMux 300000 3333 ns/op
- BenchmarkGorillaPatMux 1000000 1889 ns/op
```
These tests are just for fun, all these routers are great and efficient.
Bone isn't the fastest router for every job.
## Example
``` go
package main
import(
"net/http"
"github.com/go-zoo/bone"
)
func main () {
mux := bone.New()
mux.RegisterValidatorFunc("isNum", func(s string) bool {
if _, err := strconv.Atoi(s); err == nil {
return true
}
return false
})
// mux.Get, Post, etc ... takes http.Handler
// validator for route parameter
mux.Get("/home/:id|isNum", http.HandlerFunc(HomeHandler))
// multiple parameter
mux.Get("/profil/:id/:var", http.HandlerFunc(ProfilHandler))
mux.Post("/data", http.HandlerFunc(DataHandler))
// Support REGEX Route params
mux.Get("/index/#id^[0-9]$", http.HandlerFunc(IndexHandler))
// Handle take http.Handler
mux.Handle("/", http.HandlerFunc(RootHandler))
// GetFunc, PostFunc etc ... takes http.HandlerFunc
mux.GetFunc("/test", Handler)
http.ListenAndServe(":8080", mux)
}
func Handler(rw http.ResponseWriter, req *http.Request) {
// Get the value of the "id" parameters.
val := bone.GetValue(req, "id")
rw.Write([]byte(val))
}
```
## Blog Posts
- http://www.peterbe.com/plog/my-favorite-go-multiplexer
- https://harshladha.xyz/my-first-library-in-go-language-hasty-791b8e2b9e69
## Libs
- Errors dump for Go : [Trash](https://github.com/go-zoo/trash)
- Middleware Chaining module : [Claw](https://github.com/go-zoo/claw)
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/********************************
*** Multiplexer for Go ***
*** Bone is under MIT license ***
*** Code by CodingFerret ***
*** github.com/go-zoo ***
*********************************/
package bone
import (
"net/http"
"strings"
)
// Mux have routes and a notFound handler
// Route: all the registred route
// notFound: 404 handler, default http.NotFound if not provided
type Mux struct {
Routes map[string][]*Route
prefix string
notFound http.Handler
Validators map[string]Validator
Serve func(rw http.ResponseWriter, req *http.Request)
CaseSensitive bool
}
var (
static = "static"
method = []string{"GET", "POST", "PUT", "DELETE", "HEAD", "PATCH", "OPTIONS"}
)
type adapter func(*Mux) *Mux
// New create a pointer to a Mux instance
func New(adapters ...adapter) *Mux {
m := &Mux{Routes: make(map[string][]*Route), Serve: nil, CaseSensitive: true}
for _, adap := range adapters {
adap(m)
}
if m.Serve == nil {
m.Serve = m.DefaultServe
}
return m
}
// RegisterValidatorFunc makes the provided function available to the routes register on that mux as a validator
func (m *Mux) RegisterValidatorFunc(name string, validator func(string) bool) {
if m.Validators == nil {
m.Validators = make(map[string]Validator)
}
m.Validators[name] = newValidatorFunc(validator)
}
// RegisterValidator makes the provided validator available to the routes register on that mux
func (m *Mux) RegisterValidator(name string, validator Validator) {
if m.Validators == nil {
m.Validators = make(map[string]Validator)
}
m.Validators[name] = validator
}
// Prefix set a default prefix for all routes registred on the router
func (m *Mux) Prefix(p string) *Mux {
m.prefix = strings.TrimSuffix(p, "/")
return m
}
// DefaultServe is the default http request handler
func (m *Mux) DefaultServe(rw http.ResponseWriter, req *http.Request) {
// Check if a route match
if !m.parse(rw, req) {
// Check if it's a static ressource
if !m.staticRoute(rw, req) {
// Check if the request path doesn't end with /
if !m.validate(rw, req) {
// Check if same route exists for another HTTP method
if !m.otherMethods(rw, req) {
m.HandleNotFound(rw, req)
}
}
}
}
}
// ServeHTTP pass the request to the serve method of Mux
func (m *Mux) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if !m.CaseSensitive {
req.URL.Path = strings.ToLower(req.URL.Path)
}
m.Serve(rw, req)
}
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module github.com/go-zoo/bone
go 1.9
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/********************************
*** Multiplexer for Go ***
*** Bone is under MIT license ***
*** Code by CodingFerret ***
*** github.com/go-zoo ***
*********************************/
package bone
import (
"net/http"
"net/url"
"strings"
)
// ListenAndServe wrapper
func (m *Mux) ListenAndServe(port string) error {
return http.ListenAndServe(port, m)
}
func (m *Mux) parse(rw http.ResponseWriter, req *http.Request) bool {
for _, r := range m.Routes[req.Method] {
ok := r.parse(rw, req)
if ok {
return true
}
}
// If no HEAD method, default to GET
if req.Method == "HEAD" {
for _, r := range m.Routes["GET"] {
ok := r.parse(rw, req)
if ok {
return true
}
}
}
return false
}
// StaticRoute check if the request path is for Static route
func (m *Mux) staticRoute(rw http.ResponseWriter, req *http.Request) bool {
for _, s := range m.Routes[static] {
if len(req.URL.Path) >= s.Size {
if req.URL.Path[:s.Size] == s.Path {
s.Handler.ServeHTTP(rw, req)
return true
}
}
}
return false
}
// HandleNotFound handle when a request does not match a registered handler.
func (m *Mux) HandleNotFound(rw http.ResponseWriter, req *http.Request) {
if m.notFound != nil {
m.notFound.ServeHTTP(rw, req)
} else {
http.NotFound(rw, req)
}
}
// Check if the path don't end with a /
func (m *Mux) validate(rw http.ResponseWriter, req *http.Request) bool {
plen := len(req.URL.Path)
if plen > 1 && req.URL.Path[plen-1:] == "/" {
cleanURL(&req.URL.Path)
rw.Header().Set("Location", req.URL.String())
rw.WriteHeader(http.StatusFound)
return true
}
// Retry to find a route that match
return m.parse(rw, req)
}
func valid(path string) bool {
plen := len(path)
if plen > 1 && path[plen-1:] == "/" {
return false
}
return true
}
// Clean url path
func cleanURL(url *string) {
ulen := len((*url))
if ulen > 1 {
if (*url)[ulen-1:] == "/" {
*url = (*url)[:ulen-1]
cleanURL(url)
}
}
}
// GetValue return the key value, of the current *http.Request
func GetValue(req *http.Request, key string) string {
return GetAllValues(req)[key]
}
// GetRequestRoute returns the route of given Request
func (m *Mux) GetRequestRoute(req *http.Request) string {
cleanURL(&req.URL.Path)
for _, r := range m.Routes[req.Method] {
if r.Atts != 0 {
if r.Atts&SUB != 0 {
return r.Handler.(*Mux).GetRequestRoute(req)
}
if r.Match(req) {
return r.Path
}
}
if req.URL.Path == r.Path {
return r.Path
}
}
for _, s := range m.Routes[static] {
if len(req.URL.Path) >= s.Size {
if req.URL.Path[:s.Size] == s.Path {
return s.Path
}
}
}
return "NotFound"
}
// GetQuery return the key value, of the current *http.Request query
func GetQuery(req *http.Request, key string) []string {
if ok, value := extractQueries(req); ok {
return value[key]
}
return nil
}
// GetAllQueries return all queries of the current *http.Request
func GetAllQueries(req *http.Request) map[string][]string {
if ok, values := extractQueries(req); ok {
return values
}
return nil
}
func extractQueries(req *http.Request) (bool, map[string][]string) {
if q, err := url.ParseQuery(req.URL.RawQuery); err == nil {
var queries = make(map[string][]string)
for k, v := range q {
for _, item := range v {
values := strings.Split(item, ",")
queries[k] = append(queries[k], values...)
}
}
return true, queries
}
return false, nil
}
func (m *Mux) otherMethods(rw http.ResponseWriter, req *http.Request) bool {
for _, met := range method {
if met != req.Method {
for _, r := range m.Routes[met] {
ok := r.exists(rw, req)
if ok {
rw.WriteHeader(http.StatusMethodNotAllowed)
return true
}
}
}
}
return false
}
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// +build !go1.7
/********************************
*** Multiplexer for Go ***
*** Bone is under MIT license ***
*** Code by CodingFerret ***
*** github.com/go-zoo ***
*********************************/
package bone
import (
"net/http"
"sync"
)
var globalVars = struct {
sync.RWMutex
v map[*http.Request]map[string]string
}{v: make(map[*http.Request]map[string]string)}
// GetAllValues return the req PARAMs
func GetAllValues(req *http.Request) map[string]string {
globalVars.RLock()
values := globalVars.v[req]
globalVars.RUnlock()
return values
}
// serveMatchedRequest is an extension point for Route which allows us to conditionally compile for
// go1.7 and <go1.7
func (r *Route) serveMatchedRequest(rw http.ResponseWriter, req *http.Request, vars map[string]string) {
globalVars.Lock()
globalVars.v[req] = vars
globalVars.Unlock()
// Regardless if ServeHTTP panics (and potentially recovers) we can make sure to not leak
// memory in globalVars for this request
defer func() {
globalVars.Lock()
delete(globalVars.v, req)
globalVars.Unlock()
}()
r.Handler.ServeHTTP(rw, req)
}
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// +build go1.7
/********************************
*** Multiplexer for Go ***
*** Bone is under MIT license ***
*** Code by CodingFerret ***
*** github.com/go-zoo ***
*********************************/
package bone
import (
"context"
"net/http"
)
// contextKeyType is a private struct that is used for storing bone values in net.Context
type contextKeyType struct{}
// contextKey is the key that is used to store bone values in the net.Context for each request
var contextKey = contextKeyType{}
// GetAllValues return the req PARAMs
func GetAllValues(req *http.Request) map[string]string {
values, ok := req.Context().Value(contextKey).(map[string]string)
if ok {
return values
}
return map[string]string{}
}
// serveMatchedRequest is an extension point for Route which allows us to conditionally compile for
// go1.7 and <go1.7
func (r *Route) serveMatchedRequest(rw http.ResponseWriter, req *http.Request, vars map[string]string) {
ctx := context.WithValue(req.Context(), contextKey, vars)
newReq := req.WithContext(ctx)
r.Handler.ServeHTTP(rw, newReq)
}
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/********************************
*** Multiplexer for Go ***
*** Bone is under MIT license ***
*** Code by CodingFerret ***
*** github.com/go-zoo ***
*********************************/
package bone
import "net/http"
// Router is the same as a http.Handler
type Router interface {
ServeHTTP(http.ResponseWriter, *http.Request)
}
// Register the route in the router
func (m *Mux) Register(method string, path string, handler http.Handler) *Route {
return m.register(method, path, handler)
}
// GetFunc add a new route to the Mux with the Get method
func (m *Mux) GetFunc(path string, handler http.HandlerFunc) *Route {
return m.register("GET", path, handler)
}
// PostFunc add a new route to the Mux with the Post method
func (m *Mux) PostFunc(path string, handler http.HandlerFunc) *Route {
return m.register("POST", path, handler)
}
// PutFunc add a new route to the Mux with the Put method
func (m *Mux) PutFunc(path string, handler http.HandlerFunc) *Route {
return m.register("PUT", path, handler)
}
// DeleteFunc add a new route to the Mux with the Delete method
func (m *Mux) DeleteFunc(path string, handler http.HandlerFunc) *Route {
return m.register("DELETE", path, handler)
}
// HeadFunc add a new route to the Mux with the Head method
func (m *Mux) HeadFunc(path string, handler http.HandlerFunc) *Route {
return m.register("HEAD", path, handler)
}
// PatchFunc add a new route to the Mux with the Patch method
func (m *Mux) PatchFunc(path string, handler http.HandlerFunc) *Route {
return m.register("PATCH", path, handler)
}
// OptionsFunc add a new route to the Mux with the Options method
func (m *Mux) OptionsFunc(path string, handler http.HandlerFunc) *Route {
return m.register("OPTIONS", path, handler)
}
// NotFoundFunc the mux custom 404 handler
func (m *Mux) NotFoundFunc(handler http.HandlerFunc) {
m.notFound = handler
}
// Handle add a new route to the Mux without a HTTP method
func (m *Mux) Handle(path string, handler http.Handler) {
for _, mt := range method {
m.register(mt, path, handler)
}
}
// HandleFunc is use to pass a func(http.ResponseWriter, *Http.Request) instead of http.Handler
func (m *Mux) HandleFunc(path string, handler http.HandlerFunc) {
m.Handle(path, handler)
}
// Get add a new route to the Mux with the Get method
func (m *Mux) Get(path string, handler http.Handler) *Route {
return m.register("GET", path, handler)
}
// Post add a new route to the Mux with the Post method
func (m *Mux) Post(path string, handler http.Handler) *Route {
return m.register("POST", path, handler)
}
// Put add a new route to the Mux with the Put method
func (m *Mux) Put(path string, handler http.Handler) *Route {
return m.register("PUT", path, handler)
}
// Delete add a new route to the Mux with the Delete method
func (m *Mux) Delete(path string, handler http.Handler) *Route {
return m.register("DELETE", path, handler)
}
// Head add a new route to the Mux with the Head method
func (m *Mux) Head(path string, handler http.Handler) *Route {
return m.register("HEAD", path, handler)
}
// Patch add a new route to the Mux with the Patch method
func (m *Mux) Patch(path string, handler http.Handler) *Route {
return m.register("PATCH", path, handler)
}
// Options add a new route to the Mux with the Options method
func (m *Mux) Options(path string, handler http.Handler) *Route {
return m.register("OPTIONS", path, handler)
}
// NotFound the mux custom 404 handler
func (m *Mux) NotFound(handler http.Handler) {
m.notFound = handler
}
// Register the new route in the router with the provided method and handler
func (m *Mux) register(method string, path string, handler http.Handler) *Route {
r := NewRoute(m, m.prefix+path, handler)
r.Method = method
if valid(path) {
m.Routes[method] = append(m.Routes[method], r)
return r
}
m.Routes[static] = append(m.Routes[static], r)
return r
}
// SubRoute register a router as a SubRouter of bone
func (m *Mux) SubRoute(path string, router Router) *Route {
r := NewRoute(m, m.prefix+path, router)
if valid(path) {
r.Atts += SUB
for _, mt := range method {
m.Routes[mt] = append(m.Routes[mt], r)
}
return r
}
return nil
}
+264
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/********************************
*** Multiplexer for Go ***
*** Bone is under MIT license ***
*** Code by CodingFerret ***
*** github.com/go-zoo ***
*********************************/
package bone
import (
"net/http"
"net/url"
"regexp"
"strings"
)
const (
//PARAM value store in Atts if the route have parameters
PARAM = 2
//SUB value store in Atts if the route is a sub router
SUB = 4
//WC value store in Atts if the route have wildcard
WC = 8
//REGEX value store in Atts if the route contains regex
REGEX = 16
)
// Route content the required information for a valid route
// Path: is the Route URL
// Size: is the length of the path
// Token: is the value of each part of the path, split by /
// Pattern: is content information about the route, if it's have a route variable
// handler: is the handler who handle this route
// Method: define HTTP method on the route
type Route struct {
Path string
Method string
Size int
Atts int
wildPos int
Token Token
Pattern map[int]string
Compile map[int]*regexp.Regexp
Tag map[int]string
Handler http.Handler
mux *Mux
validators map[string][]string
}
// Token content all value of a spliting route path
// Tokens: string value of each token
// size: number of token
type Token struct {
raw []int
Tokens []string
Size int
}
// NewRoute return a pointer to a Route instance and call save() on it
func NewRoute(mux *Mux, url string, h http.Handler) *Route {
r := &Route{Path: url, Handler: h, mux: mux}
r.save()
return r
}
// Save, set automatically the Route.Size and Route.Pattern value
func (r *Route) save() {
r.Size = len(r.Path)
r.Token.Tokens = strings.Split(r.Path, "/")
for i, s := range r.Token.Tokens {
if len(s) >= 1 {
switch s[:1] {
case ":":
s = s[1:]
if r.Pattern == nil {
r.Pattern = make(map[int]string)
}
if validators := containsValidators(s); validators != nil {
if r.validators == nil {
r.validators = make(map[string][]string)
}
for _, vali := range validators {
s = s[:validators[0].start]
r.validators[s] = append(r.validators[s], vali.name[1:])
}
}
r.Pattern[i] = s
r.Atts |= PARAM
case "#":
if r.Compile == nil {
r.Compile = make(map[int]*regexp.Regexp)
r.Tag = make(map[int]string)
}
tmp := strings.Split(s, "^")
r.Tag[i] = tmp[0][1:]
r.Compile[i] = regexp.MustCompile("^" + tmp[1][:len(tmp[1])-1])
r.Atts |= REGEX
case "*":
r.wildPos = i
r.Atts |= WC
default:
r.Token.raw = append(r.Token.raw, i)
}
}
r.Token.Size++
}
}
// Match check if the request match the route Pattern
func (r *Route) Match(req *http.Request) bool {
ok, _ := r.matchAndParse(req)
return ok
}
// matchAndParse check if the request matches the route Pattern and returns a map of the parsed
// variables if it matches
func (r *Route) matchAndParse(req *http.Request) (bool, map[string]string) {
ss := strings.Split(req.URL.EscapedPath(), "/")
if r.matchRawTokens(&ss) {
if len(ss) == r.Token.Size || r.Atts&WC != 0 {
totalSize := len(r.Pattern)
if r.Atts&REGEX != 0 {
totalSize += len(r.Compile)
}
vars := make(map[string]string, totalSize)
for k, v := range r.Pattern {
if validators := r.validators[v]; validators != nil {
for _, vname := range validators {
if !(*r.mux).Validators[vname].Validate(ss[k]) {
return false, nil
}
}
}
vars[v], _ = url.QueryUnescape(ss[k])
}
if r.Atts&REGEX != 0 {
for k, v := range r.Compile {
if !v.MatchString(ss[k]) {
return false, nil
}
vars[r.Tag[k]], _ = url.QueryUnescape(ss[k])
}
}
return true, vars
}
}
return false, nil
}
func (r *Route) parse(rw http.ResponseWriter, req *http.Request) bool {
if r.Atts != 0 {
if r.Atts&SUB != 0 {
if len(req.URL.Path) >= r.Size {
if req.URL.Path[:r.Size] == r.Path {
req.URL.Path = req.URL.Path[r.Size:]
r.Handler.ServeHTTP(rw, req)
return true
}
}
}
if ok, vars := r.matchAndParse(req); ok {
r.serveMatchedRequest(rw, req, vars)
return true
}
}
if req.URL.Path == r.Path {
r.Handler.ServeHTTP(rw, req)
return true
}
return false
}
func (r *Route) matchRawTokens(ss *[]string) bool {
if len(*ss) >= r.Token.Size {
for i, v := range r.Token.raw {
if (*ss)[v] != r.Token.Tokens[v] {
if r.Atts&WC != 0 && r.wildPos == i {
return true
}
return false
}
}
return true
}
return false
}
func (r *Route) exists(rw http.ResponseWriter, req *http.Request) bool {
if r.Atts != 0 {
if r.Atts&SUB != 0 {
if len(req.URL.Path) >= r.Size {
if req.URL.Path[:r.Size] == r.Path {
return true
}
}
}
if ok, _ := r.matchAndParse(req); ok {
return true
}
}
if req.URL.Path == r.Path {
return true
}
return false
}
// Get set the route method to Get
func (r *Route) Get() *Route {
r.Method = "GET"
return r
}
// Post set the route method to Post
func (r *Route) Post() *Route {
r.Method = "POST"
return r
}
// Put set the route method to Put
func (r *Route) Put() *Route {
r.Method = "PUT"
return r
}
// Delete set the route method to Delete
func (r *Route) Delete() *Route {
r.Method = "DELETE"
return r
}
// Head set the route method to Head
func (r *Route) Head() *Route {
r.Method = "HEAD"
return r
}
// Patch set the route method to Patch
func (r *Route) Patch() *Route {
r.Method = "PATCH"
return r
}
// Options set the route method to Options
func (r *Route) Options() *Route {
r.Method = "OPTIONS"
return r
}
func (r *Route) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if r.Method != "" {
if req.Method == r.Method {
r.Handler.ServeHTTP(rw, req)
return
}
http.NotFound(rw, req)
return
}
r.Handler.ServeHTTP(rw, req)
}
+61
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/********************************
*** Multiplexer for Go ***
*** Bone is under MIT license ***
*** Code by CodingFerret ***
*** github.com/go-zoo ***
*********************************/
package bone
// Validator can be passed to a route to validate the params
type Validator interface {
Validate(string) bool
}
type validatorFunc struct {
validateFunc func(string) bool
}
func newValidatorFunc(v func(string) bool) validatorFunc {
return validatorFunc{validateFunc: v}
}
func (v validatorFunc) Validate(s string) bool {
return v.validateFunc(s)
}
type validatorInfo struct {
start int
end int
name string
}
func containsValidators(path string) []validatorInfo {
var index []int
for i, c := range path {
if c == '|' {
index = append(index, i)
}
}
if len(index) > 0 {
var validators []validatorInfo
for i, pos := range index {
if i+1 == len(index) {
validators = append(validators, validatorInfo{
start: pos,
end: len(path),
name: path[pos:len(path)],
})
} else {
validators = append(validators, validatorInfo{
start: pos,
end: index[i+1],
name: path[pos:index[i+1]],
})
}
}
return validators
}
return nil
}
+3
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# This source code refers to The Go Authors for copyright purposes.
# The master list of authors is in the main Go distribution,
# visible at http://tip.golang.org/AUTHORS.
+3
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@@ -0,0 +1,3 @@
# This source code was written by the Go contributors.
# The master list of contributors is in the main Go distribution,
# visible at http://tip.golang.org/CONTRIBUTORS.
+28
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@@ -0,0 +1,28 @@
Copyright 2010 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+324
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"errors"
"fmt"
"google.golang.org/protobuf/encoding/prototext"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/runtime/protoimpl"
)
const (
WireVarint = 0
WireFixed32 = 5
WireFixed64 = 1
WireBytes = 2
WireStartGroup = 3
WireEndGroup = 4
)
// EncodeVarint returns the varint encoded bytes of v.
func EncodeVarint(v uint64) []byte {
return protowire.AppendVarint(nil, v)
}
// SizeVarint returns the length of the varint encoded bytes of v.
// This is equal to len(EncodeVarint(v)).
func SizeVarint(v uint64) int {
return protowire.SizeVarint(v)
}
// DecodeVarint parses a varint encoded integer from b,
// returning the integer value and the length of the varint.
// It returns (0, 0) if there is a parse error.
func DecodeVarint(b []byte) (uint64, int) {
v, n := protowire.ConsumeVarint(b)
if n < 0 {
return 0, 0
}
return v, n
}
// Buffer is a buffer for encoding and decoding the protobuf wire format.
// It may be reused between invocations to reduce memory usage.
type Buffer struct {
buf []byte
idx int
deterministic bool
}
// NewBuffer allocates a new Buffer initialized with buf,
// where the contents of buf are considered the unread portion of the buffer.
func NewBuffer(buf []byte) *Buffer {
return &Buffer{buf: buf}
}
// SetDeterministic specifies whether to use deterministic serialization.
//
// Deterministic serialization guarantees that for a given binary, equal
// messages will always be serialized to the same bytes. This implies:
//
// - Repeated serialization of a message will return the same bytes.
// - Different processes of the same binary (which may be executing on
// different machines) will serialize equal messages to the same bytes.
//
// Note that the deterministic serialization is NOT canonical across
// languages. It is not guaranteed to remain stable over time. It is unstable
// across different builds with schema changes due to unknown fields.
// Users who need canonical serialization (e.g., persistent storage in a
// canonical form, fingerprinting, etc.) should define their own
// canonicalization specification and implement their own serializer rather
// than relying on this API.
//
// If deterministic serialization is requested, map entries will be sorted
// by keys in lexographical order. This is an implementation detail and
// subject to change.
func (b *Buffer) SetDeterministic(deterministic bool) {
b.deterministic = deterministic
}
// SetBuf sets buf as the internal buffer,
// where the contents of buf are considered the unread portion of the buffer.
func (b *Buffer) SetBuf(buf []byte) {
b.buf = buf
b.idx = 0
}
// Reset clears the internal buffer of all written and unread data.
func (b *Buffer) Reset() {
b.buf = b.buf[:0]
b.idx = 0
}
// Bytes returns the internal buffer.
func (b *Buffer) Bytes() []byte {
return b.buf
}
// Unread returns the unread portion of the buffer.
func (b *Buffer) Unread() []byte {
return b.buf[b.idx:]
}
// Marshal appends the wire-format encoding of m to the buffer.
func (b *Buffer) Marshal(m Message) error {
var err error
b.buf, err = marshalAppend(b.buf, m, b.deterministic)
return err
}
// Unmarshal parses the wire-format message in the buffer and
// places the decoded results in m.
// It does not reset m before unmarshaling.
func (b *Buffer) Unmarshal(m Message) error {
err := UnmarshalMerge(b.Unread(), m)
b.idx = len(b.buf)
return err
}
type unknownFields struct{ XXX_unrecognized protoimpl.UnknownFields }
func (m *unknownFields) String() string { panic("not implemented") }
func (m *unknownFields) Reset() { panic("not implemented") }
func (m *unknownFields) ProtoMessage() { panic("not implemented") }
// DebugPrint dumps the encoded bytes of b with a header and footer including s
// to stdout. This is only intended for debugging.
func (*Buffer) DebugPrint(s string, b []byte) {
m := MessageReflect(new(unknownFields))
m.SetUnknown(b)
b, _ = prototext.MarshalOptions{AllowPartial: true, Indent: "\t"}.Marshal(m.Interface())
fmt.Printf("==== %s ====\n%s==== %s ====\n", s, b, s)
}
// EncodeVarint appends an unsigned varint encoding to the buffer.
func (b *Buffer) EncodeVarint(v uint64) error {
b.buf = protowire.AppendVarint(b.buf, v)
return nil
}
// EncodeZigzag32 appends a 32-bit zig-zag varint encoding to the buffer.
func (b *Buffer) EncodeZigzag32(v uint64) error {
return b.EncodeVarint(uint64((uint32(v) << 1) ^ uint32((int32(v) >> 31))))
}
// EncodeZigzag64 appends a 64-bit zig-zag varint encoding to the buffer.
func (b *Buffer) EncodeZigzag64(v uint64) error {
return b.EncodeVarint(uint64((uint64(v) << 1) ^ uint64((int64(v) >> 63))))
}
// EncodeFixed32 appends a 32-bit little-endian integer to the buffer.
func (b *Buffer) EncodeFixed32(v uint64) error {
b.buf = protowire.AppendFixed32(b.buf, uint32(v))
return nil
}
// EncodeFixed64 appends a 64-bit little-endian integer to the buffer.
func (b *Buffer) EncodeFixed64(v uint64) error {
b.buf = protowire.AppendFixed64(b.buf, uint64(v))
return nil
}
// EncodeRawBytes appends a length-prefixed raw bytes to the buffer.
func (b *Buffer) EncodeRawBytes(v []byte) error {
b.buf = protowire.AppendBytes(b.buf, v)
return nil
}
// EncodeStringBytes appends a length-prefixed raw bytes to the buffer.
// It does not validate whether v contains valid UTF-8.
func (b *Buffer) EncodeStringBytes(v string) error {
b.buf = protowire.AppendString(b.buf, v)
return nil
}
// EncodeMessage appends a length-prefixed encoded message to the buffer.
func (b *Buffer) EncodeMessage(m Message) error {
var err error
b.buf = protowire.AppendVarint(b.buf, uint64(Size(m)))
b.buf, err = marshalAppend(b.buf, m, b.deterministic)
return err
}
// DecodeVarint consumes an encoded unsigned varint from the buffer.
func (b *Buffer) DecodeVarint() (uint64, error) {
v, n := protowire.ConsumeVarint(b.buf[b.idx:])
if n < 0 {
return 0, protowire.ParseError(n)
}
b.idx += n
return uint64(v), nil
}
// DecodeZigzag32 consumes an encoded 32-bit zig-zag varint from the buffer.
func (b *Buffer) DecodeZigzag32() (uint64, error) {
v, err := b.DecodeVarint()
if err != nil {
return 0, err
}
return uint64((uint32(v) >> 1) ^ uint32((int32(v&1)<<31)>>31)), nil
}
// DecodeZigzag64 consumes an encoded 64-bit zig-zag varint from the buffer.
func (b *Buffer) DecodeZigzag64() (uint64, error) {
v, err := b.DecodeVarint()
if err != nil {
return 0, err
}
return uint64((uint64(v) >> 1) ^ uint64((int64(v&1)<<63)>>63)), nil
}
// DecodeFixed32 consumes a 32-bit little-endian integer from the buffer.
func (b *Buffer) DecodeFixed32() (uint64, error) {
v, n := protowire.ConsumeFixed32(b.buf[b.idx:])
if n < 0 {
return 0, protowire.ParseError(n)
}
b.idx += n
return uint64(v), nil
}
// DecodeFixed64 consumes a 64-bit little-endian integer from the buffer.
func (b *Buffer) DecodeFixed64() (uint64, error) {
v, n := protowire.ConsumeFixed64(b.buf[b.idx:])
if n < 0 {
return 0, protowire.ParseError(n)
}
b.idx += n
return uint64(v), nil
}
// DecodeRawBytes consumes a length-prefixed raw bytes from the buffer.
// If alloc is specified, it returns a copy the raw bytes
// rather than a sub-slice of the buffer.
func (b *Buffer) DecodeRawBytes(alloc bool) ([]byte, error) {
v, n := protowire.ConsumeBytes(b.buf[b.idx:])
if n < 0 {
return nil, protowire.ParseError(n)
}
b.idx += n
if alloc {
v = append([]byte(nil), v...)
}
return v, nil
}
// DecodeStringBytes consumes a length-prefixed raw bytes from the buffer.
// It does not validate whether the raw bytes contain valid UTF-8.
func (b *Buffer) DecodeStringBytes() (string, error) {
v, n := protowire.ConsumeString(b.buf[b.idx:])
if n < 0 {
return "", protowire.ParseError(n)
}
b.idx += n
return v, nil
}
// DecodeMessage consumes a length-prefixed message from the buffer.
// It does not reset m before unmarshaling.
func (b *Buffer) DecodeMessage(m Message) error {
v, err := b.DecodeRawBytes(false)
if err != nil {
return err
}
return UnmarshalMerge(v, m)
}
// DecodeGroup consumes a message group from the buffer.
// It assumes that the start group marker has already been consumed and
// consumes all bytes until (and including the end group marker).
// It does not reset m before unmarshaling.
func (b *Buffer) DecodeGroup(m Message) error {
v, n, err := consumeGroup(b.buf[b.idx:])
if err != nil {
return err
}
b.idx += n
return UnmarshalMerge(v, m)
}
// consumeGroup parses b until it finds an end group marker, returning
// the raw bytes of the message (excluding the end group marker) and the
// the total length of the message (including the end group marker).
func consumeGroup(b []byte) ([]byte, int, error) {
b0 := b
depth := 1 // assume this follows a start group marker
for {
_, wtyp, tagLen := protowire.ConsumeTag(b)
if tagLen < 0 {
return nil, 0, protowire.ParseError(tagLen)
}
b = b[tagLen:]
var valLen int
switch wtyp {
case protowire.VarintType:
_, valLen = protowire.ConsumeVarint(b)
case protowire.Fixed32Type:
_, valLen = protowire.ConsumeFixed32(b)
case protowire.Fixed64Type:
_, valLen = protowire.ConsumeFixed64(b)
case protowire.BytesType:
_, valLen = protowire.ConsumeBytes(b)
case protowire.StartGroupType:
depth++
case protowire.EndGroupType:
depth--
default:
return nil, 0, errors.New("proto: cannot parse reserved wire type")
}
if valLen < 0 {
return nil, 0, protowire.ParseError(valLen)
}
b = b[valLen:]
if depth == 0 {
return b0[:len(b0)-len(b)-tagLen], len(b0) - len(b), nil
}
}
}
+63
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"google.golang.org/protobuf/reflect/protoreflect"
)
// SetDefaults sets unpopulated scalar fields to their default values.
// Fields within a oneof are not set even if they have a default value.
// SetDefaults is recursively called upon any populated message fields.
func SetDefaults(m Message) {
if m != nil {
setDefaults(MessageReflect(m))
}
}
func setDefaults(m protoreflect.Message) {
fds := m.Descriptor().Fields()
for i := 0; i < fds.Len(); i++ {
fd := fds.Get(i)
if !m.Has(fd) {
if fd.HasDefault() && fd.ContainingOneof() == nil {
v := fd.Default()
if fd.Kind() == protoreflect.BytesKind {
v = protoreflect.ValueOf(append([]byte(nil), v.Bytes()...)) // copy the default bytes
}
m.Set(fd, v)
}
continue
}
}
m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
switch {
// Handle singular message.
case fd.Cardinality() != protoreflect.Repeated:
if fd.Message() != nil {
setDefaults(m.Get(fd).Message())
}
// Handle list of messages.
case fd.IsList():
if fd.Message() != nil {
ls := m.Get(fd).List()
for i := 0; i < ls.Len(); i++ {
setDefaults(ls.Get(i).Message())
}
}
// Handle map of messages.
case fd.IsMap():
if fd.MapValue().Message() != nil {
ms := m.Get(fd).Map()
ms.Range(func(_ protoreflect.MapKey, v protoreflect.Value) bool {
setDefaults(v.Message())
return true
})
}
}
return true
})
}
+113
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@@ -0,0 +1,113 @@
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"encoding/json"
"errors"
"fmt"
"strconv"
protoV2 "google.golang.org/protobuf/proto"
)
var (
// Deprecated: No longer returned.
ErrNil = errors.New("proto: Marshal called with nil")
// Deprecated: No longer returned.
ErrTooLarge = errors.New("proto: message encodes to over 2 GB")
// Deprecated: No longer returned.
ErrInternalBadWireType = errors.New("proto: internal error: bad wiretype for oneof")
)
// Deprecated: Do not use.
type Stats struct{ Emalloc, Dmalloc, Encode, Decode, Chit, Cmiss, Size uint64 }
// Deprecated: Do not use.
func GetStats() Stats { return Stats{} }
// Deprecated: Do not use.
func MarshalMessageSet(interface{}) ([]byte, error) {
return nil, errors.New("proto: not implemented")
}
// Deprecated: Do not use.
func UnmarshalMessageSet([]byte, interface{}) error {
return errors.New("proto: not implemented")
}
// Deprecated: Do not use.
func MarshalMessageSetJSON(interface{}) ([]byte, error) {
return nil, errors.New("proto: not implemented")
}
// Deprecated: Do not use.
func UnmarshalMessageSetJSON([]byte, interface{}) error {
return errors.New("proto: not implemented")
}
// Deprecated: Do not use.
func RegisterMessageSetType(Message, int32, string) {}
// Deprecated: Do not use.
func EnumName(m map[int32]string, v int32) string {
s, ok := m[v]
if ok {
return s
}
return strconv.Itoa(int(v))
}
// Deprecated: Do not use.
func UnmarshalJSONEnum(m map[string]int32, data []byte, enumName string) (int32, error) {
if data[0] == '"' {
// New style: enums are strings.
var repr string
if err := json.Unmarshal(data, &repr); err != nil {
return -1, err
}
val, ok := m[repr]
if !ok {
return 0, fmt.Errorf("unrecognized enum %s value %q", enumName, repr)
}
return val, nil
}
// Old style: enums are ints.
var val int32
if err := json.Unmarshal(data, &val); err != nil {
return 0, fmt.Errorf("cannot unmarshal %#q into enum %s", data, enumName)
}
return val, nil
}
// Deprecated: Do not use; this type existed for intenal-use only.
type InternalMessageInfo struct{}
// Deprecated: Do not use; this method existed for intenal-use only.
func (*InternalMessageInfo) DiscardUnknown(m Message) {
DiscardUnknown(m)
}
// Deprecated: Do not use; this method existed for intenal-use only.
func (*InternalMessageInfo) Marshal(b []byte, m Message, deterministic bool) ([]byte, error) {
return protoV2.MarshalOptions{Deterministic: deterministic}.MarshalAppend(b, MessageV2(m))
}
// Deprecated: Do not use; this method existed for intenal-use only.
func (*InternalMessageInfo) Merge(dst, src Message) {
protoV2.Merge(MessageV2(dst), MessageV2(src))
}
// Deprecated: Do not use; this method existed for intenal-use only.
func (*InternalMessageInfo) Size(m Message) int {
return protoV2.Size(MessageV2(m))
}
// Deprecated: Do not use; this method existed for intenal-use only.
func (*InternalMessageInfo) Unmarshal(m Message, b []byte) error {
return protoV2.UnmarshalOptions{Merge: true}.Unmarshal(b, MessageV2(m))
}
+58
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@@ -0,0 +1,58 @@
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"google.golang.org/protobuf/reflect/protoreflect"
)
// DiscardUnknown recursively discards all unknown fields from this message
// and all embedded messages.
//
// When unmarshaling a message with unrecognized fields, the tags and values
// of such fields are preserved in the Message. This allows a later call to
// marshal to be able to produce a message that continues to have those
// unrecognized fields. To avoid this, DiscardUnknown is used to
// explicitly clear the unknown fields after unmarshaling.
func DiscardUnknown(m Message) {
if m != nil {
discardUnknown(MessageReflect(m))
}
}
func discardUnknown(m protoreflect.Message) {
m.Range(func(fd protoreflect.FieldDescriptor, val protoreflect.Value) bool {
switch {
// Handle singular message.
case fd.Cardinality() != protoreflect.Repeated:
if fd.Message() != nil {
discardUnknown(m.Get(fd).Message())
}
// Handle list of messages.
case fd.IsList():
if fd.Message() != nil {
ls := m.Get(fd).List()
for i := 0; i < ls.Len(); i++ {
discardUnknown(ls.Get(i).Message())
}
}
// Handle map of messages.
case fd.IsMap():
if fd.MapValue().Message() != nil {
ms := m.Get(fd).Map()
ms.Range(func(_ protoreflect.MapKey, v protoreflect.Value) bool {
discardUnknown(v.Message())
return true
})
}
}
return true
})
// Discard unknown fields.
if len(m.GetUnknown()) > 0 {
m.SetUnknown(nil)
}
}
+356
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@@ -0,0 +1,356 @@
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"errors"
"fmt"
"reflect"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/runtime/protoiface"
"google.golang.org/protobuf/runtime/protoimpl"
)
type (
// ExtensionDesc represents an extension descriptor and
// is used to interact with an extension field in a message.
//
// Variables of this type are generated in code by protoc-gen-go.
ExtensionDesc = protoimpl.ExtensionInfo
// ExtensionRange represents a range of message extensions.
// Used in code generated by protoc-gen-go.
ExtensionRange = protoiface.ExtensionRangeV1
// Deprecated: Do not use; this is an internal type.
Extension = protoimpl.ExtensionFieldV1
// Deprecated: Do not use; this is an internal type.
XXX_InternalExtensions = protoimpl.ExtensionFields
)
// ErrMissingExtension reports whether the extension was not present.
var ErrMissingExtension = errors.New("proto: missing extension")
var errNotExtendable = errors.New("proto: not an extendable proto.Message")
// HasExtension reports whether the extension field is present in m
// either as an explicitly populated field or as an unknown field.
func HasExtension(m Message, xt *ExtensionDesc) (has bool) {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() {
return false
}
// Check whether any populated known field matches the field number.
xtd := xt.TypeDescriptor()
if isValidExtension(mr.Descriptor(), xtd) {
has = mr.Has(xtd)
} else {
mr.Range(func(fd protoreflect.FieldDescriptor, _ protoreflect.Value) bool {
has = int32(fd.Number()) == xt.Field
return !has
})
}
// Check whether any unknown field matches the field number.
for b := mr.GetUnknown(); !has && len(b) > 0; {
num, _, n := protowire.ConsumeField(b)
has = int32(num) == xt.Field
b = b[n:]
}
return has
}
// ClearExtension removes the extension field from m
// either as an explicitly populated field or as an unknown field.
func ClearExtension(m Message, xt *ExtensionDesc) {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() {
return
}
xtd := xt.TypeDescriptor()
if isValidExtension(mr.Descriptor(), xtd) {
mr.Clear(xtd)
} else {
mr.Range(func(fd protoreflect.FieldDescriptor, _ protoreflect.Value) bool {
if int32(fd.Number()) == xt.Field {
mr.Clear(fd)
return false
}
return true
})
}
clearUnknown(mr, fieldNum(xt.Field))
}
// ClearAllExtensions clears all extensions from m.
// This includes populated fields and unknown fields in the extension range.
func ClearAllExtensions(m Message) {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() {
return
}
mr.Range(func(fd protoreflect.FieldDescriptor, _ protoreflect.Value) bool {
if fd.IsExtension() {
mr.Clear(fd)
}
return true
})
clearUnknown(mr, mr.Descriptor().ExtensionRanges())
}
// GetExtension retrieves a proto2 extended field from m.
//
// If the descriptor is type complete (i.e., ExtensionDesc.ExtensionType is non-nil),
// then GetExtension parses the encoded field and returns a Go value of the specified type.
// If the field is not present, then the default value is returned (if one is specified),
// otherwise ErrMissingExtension is reported.
//
// If the descriptor is type incomplete (i.e., ExtensionDesc.ExtensionType is nil),
// then GetExtension returns the raw encoded bytes for the extension field.
func GetExtension(m Message, xt *ExtensionDesc) (interface{}, error) {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() || mr.Descriptor().ExtensionRanges().Len() == 0 {
return nil, errNotExtendable
}
// Retrieve the unknown fields for this extension field.
var bo protoreflect.RawFields
for bi := mr.GetUnknown(); len(bi) > 0; {
num, _, n := protowire.ConsumeField(bi)
if int32(num) == xt.Field {
bo = append(bo, bi[:n]...)
}
bi = bi[n:]
}
// For type incomplete descriptors, only retrieve the unknown fields.
if xt.ExtensionType == nil {
return []byte(bo), nil
}
// If the extension field only exists as unknown fields, unmarshal it.
// This is rarely done since proto.Unmarshal eagerly unmarshals extensions.
xtd := xt.TypeDescriptor()
if !isValidExtension(mr.Descriptor(), xtd) {
return nil, fmt.Errorf("proto: bad extended type; %T does not extend %T", xt.ExtendedType, m)
}
if !mr.Has(xtd) && len(bo) > 0 {
m2 := mr.New()
if err := (proto.UnmarshalOptions{
Resolver: extensionResolver{xt},
}.Unmarshal(bo, m2.Interface())); err != nil {
return nil, err
}
if m2.Has(xtd) {
mr.Set(xtd, m2.Get(xtd))
clearUnknown(mr, fieldNum(xt.Field))
}
}
// Check whether the message has the extension field set or a default.
var pv protoreflect.Value
switch {
case mr.Has(xtd):
pv = mr.Get(xtd)
case xtd.HasDefault():
pv = xtd.Default()
default:
return nil, ErrMissingExtension
}
v := xt.InterfaceOf(pv)
rv := reflect.ValueOf(v)
if isScalarKind(rv.Kind()) {
rv2 := reflect.New(rv.Type())
rv2.Elem().Set(rv)
v = rv2.Interface()
}
return v, nil
}
// extensionResolver is a custom extension resolver that stores a single
// extension type that takes precedence over the global registry.
type extensionResolver struct{ xt protoreflect.ExtensionType }
func (r extensionResolver) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
if xtd := r.xt.TypeDescriptor(); xtd.FullName() == field {
return r.xt, nil
}
return protoregistry.GlobalTypes.FindExtensionByName(field)
}
func (r extensionResolver) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
if xtd := r.xt.TypeDescriptor(); xtd.ContainingMessage().FullName() == message && xtd.Number() == field {
return r.xt, nil
}
return protoregistry.GlobalTypes.FindExtensionByNumber(message, field)
}
// GetExtensions returns a list of the extensions values present in m,
// corresponding with the provided list of extension descriptors, xts.
// If an extension is missing in m, the corresponding value is nil.
func GetExtensions(m Message, xts []*ExtensionDesc) ([]interface{}, error) {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() {
return nil, errNotExtendable
}
vs := make([]interface{}, len(xts))
for i, xt := range xts {
v, err := GetExtension(m, xt)
if err != nil {
if err == ErrMissingExtension {
continue
}
return vs, err
}
vs[i] = v
}
return vs, nil
}
// SetExtension sets an extension field in m to the provided value.
func SetExtension(m Message, xt *ExtensionDesc, v interface{}) error {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() || mr.Descriptor().ExtensionRanges().Len() == 0 {
return errNotExtendable
}
rv := reflect.ValueOf(v)
if reflect.TypeOf(v) != reflect.TypeOf(xt.ExtensionType) {
return fmt.Errorf("proto: bad extension value type. got: %T, want: %T", v, xt.ExtensionType)
}
if rv.Kind() == reflect.Ptr {
if rv.IsNil() {
return fmt.Errorf("proto: SetExtension called with nil value of type %T", v)
}
if isScalarKind(rv.Elem().Kind()) {
v = rv.Elem().Interface()
}
}
xtd := xt.TypeDescriptor()
if !isValidExtension(mr.Descriptor(), xtd) {
return fmt.Errorf("proto: bad extended type; %T does not extend %T", xt.ExtendedType, m)
}
mr.Set(xtd, xt.ValueOf(v))
clearUnknown(mr, fieldNum(xt.Field))
return nil
}
// SetRawExtension inserts b into the unknown fields of m.
//
// Deprecated: Use Message.ProtoReflect.SetUnknown instead.
func SetRawExtension(m Message, fnum int32, b []byte) {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() {
return
}
// Verify that the raw field is valid.
for b0 := b; len(b0) > 0; {
num, _, n := protowire.ConsumeField(b0)
if int32(num) != fnum {
panic(fmt.Sprintf("mismatching field number: got %d, want %d", num, fnum))
}
b0 = b0[n:]
}
ClearExtension(m, &ExtensionDesc{Field: fnum})
mr.SetUnknown(append(mr.GetUnknown(), b...))
}
// ExtensionDescs returns a list of extension descriptors found in m,
// containing descriptors for both populated extension fields in m and
// also unknown fields of m that are in the extension range.
// For the later case, an type incomplete descriptor is provided where only
// the ExtensionDesc.Field field is populated.
// The order of the extension descriptors is undefined.
func ExtensionDescs(m Message) ([]*ExtensionDesc, error) {
mr := MessageReflect(m)
if mr == nil || !mr.IsValid() || mr.Descriptor().ExtensionRanges().Len() == 0 {
return nil, errNotExtendable
}
// Collect a set of known extension descriptors.
extDescs := make(map[protoreflect.FieldNumber]*ExtensionDesc)
mr.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
if fd.IsExtension() {
xt := fd.(protoreflect.ExtensionTypeDescriptor)
if xd, ok := xt.Type().(*ExtensionDesc); ok {
extDescs[fd.Number()] = xd
}
}
return true
})
// Collect a set of unknown extension descriptors.
extRanges := mr.Descriptor().ExtensionRanges()
for b := mr.GetUnknown(); len(b) > 0; {
num, _, n := protowire.ConsumeField(b)
if extRanges.Has(num) && extDescs[num] == nil {
extDescs[num] = nil
}
b = b[n:]
}
// Transpose the set of descriptors into a list.
var xts []*ExtensionDesc
for num, xt := range extDescs {
if xt == nil {
xt = &ExtensionDesc{Field: int32(num)}
}
xts = append(xts, xt)
}
return xts, nil
}
// isValidExtension reports whether xtd is a valid extension descriptor for md.
func isValidExtension(md protoreflect.MessageDescriptor, xtd protoreflect.ExtensionTypeDescriptor) bool {
return xtd.ContainingMessage() == md && md.ExtensionRanges().Has(xtd.Number())
}
// isScalarKind reports whether k is a protobuf scalar kind (except bytes).
// This function exists for historical reasons since the representation of
// scalars differs between v1 and v2, where v1 uses *T and v2 uses T.
func isScalarKind(k reflect.Kind) bool {
switch k {
case reflect.Bool, reflect.Int32, reflect.Int64, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64, reflect.String:
return true
default:
return false
}
}
// clearUnknown removes unknown fields from m where remover.Has reports true.
func clearUnknown(m protoreflect.Message, remover interface {
Has(protoreflect.FieldNumber) bool
}) {
var bo protoreflect.RawFields
for bi := m.GetUnknown(); len(bi) > 0; {
num, _, n := protowire.ConsumeField(bi)
if !remover.Has(num) {
bo = append(bo, bi[:n]...)
}
bi = bi[n:]
}
if bi := m.GetUnknown(); len(bi) != len(bo) {
m.SetUnknown(bo)
}
}
type fieldNum protoreflect.FieldNumber
func (n1 fieldNum) Has(n2 protoreflect.FieldNumber) bool {
return protoreflect.FieldNumber(n1) == n2
}
+306
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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"fmt"
"reflect"
"strconv"
"strings"
"sync"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/runtime/protoimpl"
)
// StructProperties represents protocol buffer type information for a
// generated protobuf message in the open-struct API.
//
// Deprecated: Do not use.
type StructProperties struct {
// Prop are the properties for each field.
//
// Fields belonging to a oneof are stored in OneofTypes instead, with a
// single Properties representing the parent oneof held here.
//
// The order of Prop matches the order of fields in the Go struct.
// Struct fields that are not related to protobufs have a "XXX_" prefix
// in the Properties.Name and must be ignored by the user.
Prop []*Properties
// OneofTypes contains information about the oneof fields in this message.
// It is keyed by the protobuf field name.
OneofTypes map[string]*OneofProperties
}
// Properties represents the type information for a protobuf message field.
//
// Deprecated: Do not use.
type Properties struct {
// Name is a placeholder name with little meaningful semantic value.
// If the name has an "XXX_" prefix, the entire Properties must be ignored.
Name string
// OrigName is the protobuf field name or oneof name.
OrigName string
// JSONName is the JSON name for the protobuf field.
JSONName string
// Enum is a placeholder name for enums.
// For historical reasons, this is neither the Go name for the enum,
// nor the protobuf name for the enum.
Enum string // Deprecated: Do not use.
// Weak contains the full name of the weakly referenced message.
Weak string
// Wire is a string representation of the wire type.
Wire string
// WireType is the protobuf wire type for the field.
WireType int
// Tag is the protobuf field number.
Tag int
// Required reports whether this is a required field.
Required bool
// Optional reports whether this is a optional field.
Optional bool
// Repeated reports whether this is a repeated field.
Repeated bool
// Packed reports whether this is a packed repeated field of scalars.
Packed bool
// Proto3 reports whether this field operates under the proto3 syntax.
Proto3 bool
// Oneof reports whether this field belongs within a oneof.
Oneof bool
// Default is the default value in string form.
Default string
// HasDefault reports whether the field has a default value.
HasDefault bool
// MapKeyProp is the properties for the key field for a map field.
MapKeyProp *Properties
// MapValProp is the properties for the value field for a map field.
MapValProp *Properties
}
// OneofProperties represents the type information for a protobuf oneof.
//
// Deprecated: Do not use.
type OneofProperties struct {
// Type is a pointer to the generated wrapper type for the field value.
// This is nil for messages that are not in the open-struct API.
Type reflect.Type
// Field is the index into StructProperties.Prop for the containing oneof.
Field int
// Prop is the properties for the field.
Prop *Properties
}
// String formats the properties in the protobuf struct field tag style.
func (p *Properties) String() string {
s := p.Wire
s += "," + strconv.Itoa(p.Tag)
if p.Required {
s += ",req"
}
if p.Optional {
s += ",opt"
}
if p.Repeated {
s += ",rep"
}
if p.Packed {
s += ",packed"
}
s += ",name=" + p.OrigName
if p.JSONName != "" {
s += ",json=" + p.JSONName
}
if len(p.Enum) > 0 {
s += ",enum=" + p.Enum
}
if len(p.Weak) > 0 {
s += ",weak=" + p.Weak
}
if p.Proto3 {
s += ",proto3"
}
if p.Oneof {
s += ",oneof"
}
if p.HasDefault {
s += ",def=" + p.Default
}
return s
}
// Parse populates p by parsing a string in the protobuf struct field tag style.
func (p *Properties) Parse(tag string) {
// For example: "bytes,49,opt,name=foo,def=hello!"
for len(tag) > 0 {
i := strings.IndexByte(tag, ',')
if i < 0 {
i = len(tag)
}
switch s := tag[:i]; {
case strings.HasPrefix(s, "name="):
p.OrigName = s[len("name="):]
case strings.HasPrefix(s, "json="):
p.JSONName = s[len("json="):]
case strings.HasPrefix(s, "enum="):
p.Enum = s[len("enum="):]
case strings.HasPrefix(s, "weak="):
p.Weak = s[len("weak="):]
case strings.Trim(s, "0123456789") == "":
n, _ := strconv.ParseUint(s, 10, 32)
p.Tag = int(n)
case s == "opt":
p.Optional = true
case s == "req":
p.Required = true
case s == "rep":
p.Repeated = true
case s == "varint" || s == "zigzag32" || s == "zigzag64":
p.Wire = s
p.WireType = WireVarint
case s == "fixed32":
p.Wire = s
p.WireType = WireFixed32
case s == "fixed64":
p.Wire = s
p.WireType = WireFixed64
case s == "bytes":
p.Wire = s
p.WireType = WireBytes
case s == "group":
p.Wire = s
p.WireType = WireStartGroup
case s == "packed":
p.Packed = true
case s == "proto3":
p.Proto3 = true
case s == "oneof":
p.Oneof = true
case strings.HasPrefix(s, "def="):
// The default tag is special in that everything afterwards is the
// default regardless of the presence of commas.
p.HasDefault = true
p.Default, i = tag[len("def="):], len(tag)
}
tag = strings.TrimPrefix(tag[i:], ",")
}
}
// Init populates the properties from a protocol buffer struct tag.
//
// Deprecated: Do not use.
func (p *Properties) Init(typ reflect.Type, name, tag string, f *reflect.StructField) {
p.Name = name
p.OrigName = name
if tag == "" {
return
}
p.Parse(tag)
if typ != nil && typ.Kind() == reflect.Map {
p.MapKeyProp = new(Properties)
p.MapKeyProp.Init(nil, "Key", f.Tag.Get("protobuf_key"), nil)
p.MapValProp = new(Properties)
p.MapValProp.Init(nil, "Value", f.Tag.Get("protobuf_val"), nil)
}
}
var propertiesCache sync.Map // map[reflect.Type]*StructProperties
// GetProperties returns the list of properties for the type represented by t,
// which must be a generated protocol buffer message in the open-struct API,
// where protobuf message fields are represented by exported Go struct fields.
//
// Deprecated: Use protobuf reflection instead.
func GetProperties(t reflect.Type) *StructProperties {
if p, ok := propertiesCache.Load(t); ok {
return p.(*StructProperties)
}
p, _ := propertiesCache.LoadOrStore(t, newProperties(t))
return p.(*StructProperties)
}
func newProperties(t reflect.Type) *StructProperties {
if t.Kind() != reflect.Struct {
panic(fmt.Sprintf("%v is not a generated message in the open-struct API", t))
}
var hasOneof bool
prop := new(StructProperties)
// Construct a list of properties for each field in the struct.
for i := 0; i < t.NumField(); i++ {
p := new(Properties)
f := t.Field(i)
tagField := f.Tag.Get("protobuf")
p.Init(f.Type, f.Name, tagField, &f)
tagOneof := f.Tag.Get("protobuf_oneof")
if tagOneof != "" {
hasOneof = true
p.OrigName = tagOneof
}
// Rename unrelated struct fields with the "XXX_" prefix since so much
// user code simply checks for this to exclude special fields.
if tagField == "" && tagOneof == "" && !strings.HasPrefix(p.Name, "XXX_") {
p.Name = "XXX_" + p.Name
p.OrigName = "XXX_" + p.OrigName
} else if p.Weak != "" {
p.Name = p.OrigName // avoid possible "XXX_" prefix on weak field
}
prop.Prop = append(prop.Prop, p)
}
// Construct a mapping of oneof field names to properties.
if hasOneof {
var oneofWrappers []interface{}
if fn, ok := reflect.PtrTo(t).MethodByName("XXX_OneofFuncs"); ok {
oneofWrappers = fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))})[3].Interface().([]interface{})
}
if fn, ok := reflect.PtrTo(t).MethodByName("XXX_OneofWrappers"); ok {
oneofWrappers = fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))})[0].Interface().([]interface{})
}
if m, ok := reflect.Zero(reflect.PtrTo(t)).Interface().(protoreflect.ProtoMessage); ok {
if m, ok := m.ProtoReflect().(interface{ ProtoMessageInfo() *protoimpl.MessageInfo }); ok {
oneofWrappers = m.ProtoMessageInfo().OneofWrappers
}
}
prop.OneofTypes = make(map[string]*OneofProperties)
for _, wrapper := range oneofWrappers {
p := &OneofProperties{
Type: reflect.ValueOf(wrapper).Type(), // *T
Prop: new(Properties),
}
f := p.Type.Elem().Field(0)
p.Prop.Name = f.Name
p.Prop.Parse(f.Tag.Get("protobuf"))
// Determine the struct field that contains this oneof.
// Each wrapper is assignable to exactly one parent field.
var foundOneof bool
for i := 0; i < t.NumField() && !foundOneof; i++ {
if p.Type.AssignableTo(t.Field(i).Type) {
p.Field = i
foundOneof = true
}
}
if !foundOneof {
panic(fmt.Sprintf("%v is not a generated message in the open-struct API", t))
}
prop.OneofTypes[p.Prop.OrigName] = p
}
}
return prop
}
func (sp *StructProperties) Len() int { return len(sp.Prop) }
func (sp *StructProperties) Less(i, j int) bool { return false }
func (sp *StructProperties) Swap(i, j int) { return }
+167
View File
@@ -0,0 +1,167 @@
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package proto provides functionality for handling protocol buffer messages.
// In particular, it provides marshaling and unmarshaling between a protobuf
// message and the binary wire format.
//
// See https://developers.google.com/protocol-buffers/docs/gotutorial for
// more information.
//
// Deprecated: Use the "google.golang.org/protobuf/proto" package instead.
package proto
import (
protoV2 "google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/runtime/protoiface"
"google.golang.org/protobuf/runtime/protoimpl"
)
const (
ProtoPackageIsVersion1 = true
ProtoPackageIsVersion2 = true
ProtoPackageIsVersion3 = true
ProtoPackageIsVersion4 = true
)
// GeneratedEnum is any enum type generated by protoc-gen-go
// which is a named int32 kind.
// This type exists for documentation purposes.
type GeneratedEnum interface{}
// GeneratedMessage is any message type generated by protoc-gen-go
// which is a pointer to a named struct kind.
// This type exists for documentation purposes.
type GeneratedMessage interface{}
// Message is a protocol buffer message.
//
// This is the v1 version of the message interface and is marginally better
// than an empty interface as it lacks any method to programatically interact
// with the contents of the message.
//
// A v2 message is declared in "google.golang.org/protobuf/proto".Message and
// exposes protobuf reflection as a first-class feature of the interface.
//
// To convert a v1 message to a v2 message, use the MessageV2 function.
// To convert a v2 message to a v1 message, use the MessageV1 function.
type Message = protoiface.MessageV1
// MessageV1 converts either a v1 or v2 message to a v1 message.
// It returns nil if m is nil.
func MessageV1(m GeneratedMessage) protoiface.MessageV1 {
return protoimpl.X.ProtoMessageV1Of(m)
}
// MessageV2 converts either a v1 or v2 message to a v2 message.
// It returns nil if m is nil.
func MessageV2(m GeneratedMessage) protoV2.Message {
return protoimpl.X.ProtoMessageV2Of(m)
}
// MessageReflect returns a reflective view for a message.
// It returns nil if m is nil.
func MessageReflect(m Message) protoreflect.Message {
return protoimpl.X.MessageOf(m)
}
// Marshaler is implemented by messages that can marshal themselves.
// This interface is used by the following functions: Size, Marshal,
// Buffer.Marshal, and Buffer.EncodeMessage.
//
// Deprecated: Do not implement.
type Marshaler interface {
// Marshal formats the encoded bytes of the message.
// It should be deterministic and emit valid protobuf wire data.
// The caller takes ownership of the returned buffer.
Marshal() ([]byte, error)
}
// Unmarshaler is implemented by messages that can unmarshal themselves.
// This interface is used by the following functions: Unmarshal, UnmarshalMerge,
// Buffer.Unmarshal, Buffer.DecodeMessage, and Buffer.DecodeGroup.
//
// Deprecated: Do not implement.
type Unmarshaler interface {
// Unmarshal parses the encoded bytes of the protobuf wire input.
// The provided buffer is only valid for during method call.
// It should not reset the receiver message.
Unmarshal([]byte) error
}
// Merger is implemented by messages that can merge themselves.
// This interface is used by the following functions: Clone and Merge.
//
// Deprecated: Do not implement.
type Merger interface {
// Merge merges the contents of src into the receiver message.
// It clones all data structures in src such that it aliases no mutable
// memory referenced by src.
Merge(src Message)
}
// RequiredNotSetError is an error type returned when
// marshaling or unmarshaling a message with missing required fields.
type RequiredNotSetError struct {
err error
}
func (e *RequiredNotSetError) Error() string {
if e.err != nil {
return e.err.Error()
}
return "proto: required field not set"
}
func (e *RequiredNotSetError) RequiredNotSet() bool {
return true
}
func checkRequiredNotSet(m protoV2.Message) error {
if err := protoV2.CheckInitialized(m); err != nil {
return &RequiredNotSetError{err: err}
}
return nil
}
// Clone returns a deep copy of src.
func Clone(src Message) Message {
return MessageV1(protoV2.Clone(MessageV2(src)))
}
// Merge merges src into dst, which must be messages of the same type.
//
// Populated scalar fields in src are copied to dst, while populated
// singular messages in src are merged into dst by recursively calling Merge.
// The elements of every list field in src is appended to the corresponded
// list fields in dst. The entries of every map field in src is copied into
// the corresponding map field in dst, possibly replacing existing entries.
// The unknown fields of src are appended to the unknown fields of dst.
func Merge(dst, src Message) {
protoV2.Merge(MessageV2(dst), MessageV2(src))
}
// Equal reports whether two messages are equal.
// If two messages marshal to the same bytes under deterministic serialization,
// then Equal is guaranteed to report true.
//
// Two messages are equal if they are the same protobuf message type,
// have the same set of populated known and extension field values,
// and the same set of unknown fields values.
//
// Scalar values are compared with the equivalent of the == operator in Go,
// except bytes values which are compared using bytes.Equal and
// floating point values which specially treat NaNs as equal.
// Message values are compared by recursively calling Equal.
// Lists are equal if each element value is also equal.
// Maps are equal if they have the same set of keys, where the pair of values
// for each key is also equal.
func Equal(x, y Message) bool {
return protoV2.Equal(MessageV2(x), MessageV2(y))
}
func isMessageSet(md protoreflect.MessageDescriptor) bool {
ms, ok := md.(interface{ IsMessageSet() bool })
return ok && ms.IsMessageSet()
}

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