supermq/cmd/re/main.go

// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0

// Package main contains rule engine main function to start the service.
package main

import (
	"context"
	"fmt"
	"log"
	"log/slog"
	"net/url"
	"os"
	"time"

	chclient "github.com/absmach/callhome/pkg/client"
	"github.com/absmach/magistrala"
	"github.com/absmach/magistrala/consumers"
	redisclient "github.com/absmach/magistrala/internal/clients/redis"
	mglog "github.com/absmach/magistrala/logger"
	authnsvc "github.com/absmach/magistrala/pkg/authn/authsvc"
	mgauthz "github.com/absmach/magistrala/pkg/authz"
	authzsvc "github.com/absmach/magistrala/pkg/authz/authsvc"
	"github.com/absmach/magistrala/pkg/grpcclient"
	jaegerclient "github.com/absmach/magistrala/pkg/jaeger"
	"github.com/absmach/magistrala/pkg/messaging/brokers"
	brokerstracing "github.com/absmach/magistrala/pkg/messaging/brokers/tracing"
	pgclient "github.com/absmach/magistrala/pkg/postgres"
	"github.com/absmach/magistrala/pkg/server"
	httpserver "github.com/absmach/magistrala/pkg/server/http"
	"github.com/absmach/magistrala/pkg/uuid"
	"github.com/absmach/magistrala/re"
	httpapi "github.com/absmach/magistrala/re/api"
	repg "github.com/absmach/magistrala/re/postgres"
	"github.com/caarlos0/env/v11"
	"github.com/jmoiron/sqlx"
	"github.com/redis/go-redis/v9"
	"go.opentelemetry.io/otel/trace"
	"golang.org/x/sync/errgroup"
)

const (
	svcName        = "rules_engine"
	envPrefixDB    = "MG_RE_DB_"
	envPrefixHTTP  = "MG_RE_HTTP_"
	envPrefixAuth  = "MG_AUTH_GRPC_"
	defDB          = "r"
	defSvcHTTPPort = "9008"
)

type config struct {
	LogLevel         string        `env:"MG_RE_LOG_LEVEL"           envDefault:"info"`
	InstanceID       string        `env:"MG_RE_INSTANCE_ID"         envDefault:""`
	JaegerURL        url.URL       `env:"MG_JAEGER_URL"             envDefault:"http://localhost:4318/v1/traces"`
	SendTelemetry    bool          `env:"MG_SEND_TELEMETRY"         envDefault:"true"`
	ESURL            string        `env:"MG_ES_URL"                 envDefault:"nats://localhost:4222"`
	CacheURL         string        `env:"MG_RE_CACHE_URL"           envDefault:"redis://localhost:6379/0"`
	CacheKeyDuration time.Duration `env:"MG_RE_CACHE_KEY_DURATION"  envDefault:"10m"`
	TraceRatio       float64       `env:"MG_JAEGER_TRACE_RATIO"     envDefault:"1.0"`
	ConfigPath       string        `env:"MG_RE_CONFIG_PATH"         envDefault:"/config.toml"`
	BrokerURL        string        `env:"MG_MESSAGE_BROKER_URL"     envDefault:"nats://localhost:4222"`
}

func main() {
	ctx, cancel := context.WithCancel(context.Background())
	g, ctx := errgroup.WithContext(ctx)

	// Create new rule engine configuration
	cfg := config{}
	if err := env.Parse(&cfg); err != nil {
		log.Fatalf("failed to load %s configuration : %s", svcName, err)
	}

	var logger *slog.Logger
	logger, err := mglog.New(os.Stdout, cfg.LogLevel)
	if err != nil {
		log.Fatalf("failed to init logger: %s", err.Error())
	}

	var exitCode int
	defer mglog.ExitWithError(&exitCode)

	if cfg.InstanceID == "" {
		if cfg.InstanceID, err = uuid.New().ID(); err != nil {
			logger.Error(fmt.Sprintf("failed to generate instanceID: %s", err))
			exitCode = 1
			return
		}
	}

	// Create new database for rule engine.
	dbConfig := pgclient.Config{Name: defDB}
	if err := env.ParseWithOptions(&dbConfig, env.Options{Prefix: envPrefixDB}); err != nil {
		logger.Error(err.Error())
		exitCode = 1
		return
	}
	db, err := pgclient.Setup(dbConfig, *repg.Migration())
	if err != nil {
		logger.Error(err.Error())
		exitCode = 1
		return
	}
	defer db.Close()

	tp, err := jaegerclient.NewProvider(ctx, svcName, cfg.JaegerURL, cfg.InstanceID, cfg.TraceRatio)
	if err != nil {
		logger.Error(fmt.Sprintf("Failed to init Jaeger: %s", err))
		exitCode = 1
		return
	}
	defer func() {
		if err := tp.Shutdown(ctx); err != nil {
			logger.Error(fmt.Sprintf("Error shutting down tracer provider: %v", err))
		}
	}()
	tracer := tp.Tracer(svcName)

	pubSub, err := brokers.NewPubSub(ctx, cfg.BrokerURL, logger)
	if err != nil {
		logger.Error(fmt.Sprintf("failed to connect to message broker: %s", err))
		exitCode = 1
		return
	}
	defer pubSub.Close()

	httpServerConfig := server.Config{Port: defSvcHTTPPort}
	if err := env.ParseWithOptions(&httpServerConfig, env.Options{Prefix: envPrefixHTTP}); err != nil {
		logger.Error(fmt.Sprintf("failed to load %s HTTP server configuration : %s", svcName, err))
		exitCode = 1
		return
	}
	pubSub = brokerstracing.NewPubSub(httpServerConfig, tracer, pubSub)

	// Setup new redis cache client
	cacheclient, err := redisclient.Connect(cfg.CacheURL)
	if err != nil {
		logger.Error(err.Error())
		exitCode = 1
		return
	}
	defer cacheclient.Close()

	grpcCfg := grpcclient.Config{}
	if err := env.ParseWithOptions(&grpcCfg, env.Options{Prefix: envPrefixAuth}); err != nil {
		logger.Error(fmt.Sprintf("failed to load auth gRPC client configuration : %s", err))
		exitCode = 1
		return
	}
	authn, authnClient, err := authnsvc.NewAuthentication(ctx, grpcCfg)
	if err != nil {
		logger.Error(err.Error())
		exitCode = 1
		return
	}
	defer authnClient.Close()
	logger.Info("AuthN  successfully connected to auth gRPC server " + authnClient.Secure())

	authz, authzClient, err := authzsvc.NewAuthorization(ctx, grpcCfg)
	if err != nil {
		logger.Error(err.Error())
		exitCode = 1
		return
	}
	defer authzClient.Close()
	logger.Info("AuthZ  successfully connected to auth gRPC server " + authnClient.Secure())

	svc, err := newService(ctx, db, dbConfig, authz, cacheclient, cfg.CacheKeyDuration, cfg.ESURL, tracer, logger)
	if err != nil {
		logger.Error(fmt.Sprintf("failed to create services: %s", err))
		exitCode = 1
		return
	}

	if err = consumers.Start(ctx, svcName, pubSub, svc, cfg.ConfigPath, logger); err != nil {
		logger.Error(fmt.Sprintf("failed to create Rule Engine: %s", err))
		exitCode = 1
		return
	}
	httpSvc := httpserver.NewServer(ctx, cancel, svcName, httpServerConfig, httpapi.MakeHandler(svc, authn, logger, cfg.InstanceID), logger)

	if cfg.SendTelemetry {
		chc := chclient.New(svcName, magistrala.Version, logger, cancel)
		go chc.CallHome(ctx)
	}

	// Start all servers
	g.Go(func() error {
		return httpSvc.Start()
	})

	g.Go(func() error {
		return server.StopSignalHandler(ctx, cancel, logger, svcName, httpSvc)
	})

	if err := g.Wait(); err != nil {
		logger.Error(fmt.Sprintf("%s service terminated: %s", svcName, err))
	}
}

func newService(ctx context.Context, db *sqlx.DB, dbConfig pgclient.Config, authz mgauthz.Authorization, cacheClient *redis.Client, keyDuration time.Duration, esURL string, tracer trace.Tracer, logger *slog.Logger) (re.Service, error) {
	database := pgclient.NewDatabase(db, dbConfig, tracer)
	repo := repg.NewRepository(database)
	idp := uuid.New()

	// csvc = authzmw.AuthorizationMiddleware(csvc, authz)
	csvc := re.NewService(repo, idp, nil)

	return csvc, nil
}