refactor(docker): Add docker demo

Add initiall commit that tests metrics reading using prometheus on docker

Signed-off-by: Rodney Osodo <socials@rodneyosodo.com>

.dockerignore

@@ -0,0 +1,11 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+.gitignore
+docker-compose.yaml
+LICENSE
+Makefile
+prometheus.yaml
+README.md

Dockerfile

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+FROM python:3.8.4-slim
+
+RUN apt update && apt install -y wait-for-it && \
+    pip install --upgrade pip && \
+    pip install nameko nameko-prometheus
+
+COPY . /var/run/my_service
+
+WORKDIR /var/run/my_service
+
+CMD ["nameko", "run", "service:HTTPService", "--config", "config.yaml"]

Makefile

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+.PHONY: build-image
+build-image:
+	docker build -t gitea.rodneyosodo.com/rodneyosodo/nameko-prometheus:latest .
+
+.PHONY: push-image
+push-image:
+	docker push gitea.rodneyosodo.com/rodneyosodo/nameko-prometheus:latest
+
+.PHONY: run
+run:
+	nameko run service:HTTPService --config config.yaml

README.md

@@ -1,3 +1,27 @@
 # nameko-prometheus
 
-Testing nameko with Prometheus
+Testing nameko with Prometheus
+
+## Docker Compose
+
+First step is to build the image:
+
+```bash
+make build-image
+```
+
+This step can be ignored if you want to use the image from Docker Registry.
+
+Then, you can run the services:
+
+```bash
+docker compose -f docker-compose.yaml up
+```
+
+Simulate network traffic:
+
+```bash
+for i in {1..100}; do curl -X GET http://localhost:8000/goodbye && curl -X GET http://localhost:8000/hello; done
+```
+
+You can access the Prometheus dashboard at `http://localhost:9090`.

config.yaml

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+WEB_SERVER_ADDRESS: 0.0.0.0:8000

docker-compose.yaml

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+networks:
+  nameko-prometheus-base-net:
+    driver: bridge
+
+volumes:
+  prometheus-data:
+
+services:
+  my_service:
+    image: gitea.rodneyosodo.com/rodneyosodo/nameko-prometheus:latest
+    container_name: nameko-service
+    restart: on-failure
+    ports:
+      - 8000:8000
+    networks:
+      - nameko-prometheus-base-net
+
+  prometheus:
+    image: prom/prometheus:v2.45.6
+    container_name: nameko-prometheus
+    restart: unless-stopped
+    command:
+      - "--config.file=/etc/prometheus/prometheus.yaml"
+    ports:
+      - 9090:9090
+    volumes:
+      - ./prometheus.yaml:/etc/prometheus/prometheus.yaml
+      - prometheus-data:/prometheus
+    networks:
+      - nameko-prometheus-base-net

prometheus.yaml

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+global:
+  scrape_interval: 5s
+  scrape_timeout: 5s
+  evaluation_interval: 15s
+scrape_configs:
+  - job_name: "my_service"
+    honor_timestamps: true
+    scheme: http
+    metrics_path: /metrics
+    static_configs:
+      - targets:
+          - my_service:8000

service.py

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+import json
+import random
+import time
+from nameko.web.handlers import http
+from nameko_prometheus import PrometheusMetrics
+
+class HTTPService:
+    name = "http_service"
+    metrics = PrometheusMetrics()
+
+    @http("GET", "/metrics")
+    def expose_metrics(self, request):
+        return self.metrics.expose_metrics(request)
+
+    @http("GET", "/hello")
+    def say_hello(self, request):
+        time.sleep(random.random() * 0.01)
+        return json.dumps({"message": "Hello!"})
+
+    @http("GET", "/goodbye")
+    def say_goodbye(self, request):
+        time.sleep(random.random() * 0.01)
+        return json.dumps({"message": "Goodbye!"})