درس ۳ سطح پیشرفته: Microservices، Docker، Kubernetes، CI/CD و استقرار حرفه‌ای در پایتون

# user_service/main.py
from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI(title="User Service")

class User(BaseModel):
    id: int
    name: str
    email: str

fake_db = {1: User(id=1, name="علی", email="ali@example.com")}

@app.get("/users/{user_id}")
async def get_user(user_id: int):
    return fake_db.get(user_id)

@app.post("/users/")
async def create_user(user: User):
    fake_db[user.id] = user
    return {"status": "created", "user_id": user.id}

# order_service/main.py
from fastapi import FastAPI
import httpx

app = FastAPI(title="Order Service")

@app.post("/orders/")
async def create_order(user_id: int, product: str):
    # فراخوانی User Service
    async with httpx.AsyncClient() as client:
        response = await client.get(f"http://user-service:8000/users/{user_id}")
        if response.status_code != 200:
            return {"error": "User not found"}
    
    return {"user_id": user_id, "product": product, "status": "created"}

# Dockerfile برای هر سرویس
FROM python:3.11-slim

WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
COPY . .

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

# docker-compose.yml – همه سرویس‌ها با هم
version: "3.9"
services:
  user-service:
    build: ./user_service
    ports:
      - "8001:8000"
    environment:
      - DATABASE_URL=postgresql://user:pass@db/user_db

  order-service:
    build: ./order_service
    ports:
      - "8002:8000"
    depends_on:
      - user-service

  notification-service:
    build: ./notification_service
    ports:
      - "8003:8000"

  db:
    image: postgres:15
    environment:
      POSTGRES_USER: user
      POSTGRES_PASSWORD: pass
      POSTGRES_DB: user_db

# k8s/user-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: user-service
spec:
  replicas: 3
  selector:
    matchLabels:
      app: user-service
  template:
    metadata:
      labels:
        app: user-service
    spec:
      containers:
      - name: user-service
        image: your-registry/user-service:latest
        ports:
        - containerPort: 8000
        env:
        - name: DATABASE_URL
          valueFrom:
            secretKeyRef:
              name: db-secret
              key: url

# .github/workflows/ci-cd.yml
name: CI/CD Pipeline

on:
  push:
    branches: [ main ]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"
      - run: pip install pytest
      - run: pytest

  build-and-push:
    needs: test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      - name: Build and push user-service
        uses: docker/build-push-action@v5
        with:
          context: ./user_service
          push: true
          tags: yourname/user-service:latest

  deploy:
    needs: build-and-push
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Deploy to Kubernetes
        uses: azure/k8s-deploy@v4
        with:
          manifests: k8s/
          kubeconfig: ${{ secrets.KUBECONFIG }}