Merge pull request 'feature/prometheus-healthcheck' (#3) from feature/prometheus-healthcheck into main

Reviewed-on: #3

.gitea/workflows/build.yaml

@@ -6,7 +6,13 @@ on:
       - main
 
 env:
+  GHCR_ORG: gansejunge
   IMAGE_NAME: app-notifications-backend-api-internal
+  IMAGE_PATH: ghcr.io/gansejunge/app-notifications-backend-api-internal
+  OPS_ORG: notifier
+  OPS_REPO: ops-deployment
+  OPS_BRANCH_BASE: main
+  OPS_PATH: backend-api-internal/deployment.yaml
 
 jobs:
   build:
@@ -18,7 +24,40 @@ jobs:
       - name: Log in to GHCR
         run: echo "${{ secrets.GHCR_TOKEN }}" | docker login ghcr.io -u ${{ secrets.GHCR_USERNAME }} --password-stdin
 
+      - name: Get Latest Tag
+        id: get_tag
+        run: |
+          BASE64_TOKEN=$(echo "${{ secrets.GHCR_TOKEN }}" | base64)
+          LATEST_TAG=$(curl -s -H "Authorization: Bearer $BASE64_TOKEN" \
+            https://ghcr.io/v2/${{ env.GHCR_ORG }}/${{ env.IMAGE_NAME }}/tags/list \
+            | jq -r '.tags | map(select(test("^[0-9]+$"))) | map(tonumber) | max // 0')
+          NEXT_TAG=$((LATEST_TAG + 1))
+          echo "latest=$LATEST_TAG" >> $GITHUB_OUTPUT
+          echo "next=$NEXT_TAG" >> $GITHUB_OUTPUT
+
       - name: Build and Push Docker Image
         run: |
-          docker build -t ghcr.io/gansejunge/${IMAGE_NAME}:1 .
-          docker push ghcr.io/gansejunge/${IMAGE_NAME}:1
+          docker build -t ghcr.io/gansejunge/${{ env.IMAGE_NAME }}:${{ steps.get_tag.outputs.next }} .
+          docker push ghcr.io/gansejunge/${{ env.IMAGE_NAME }}:${{ steps.get_tag.outputs.next }}
+
+      - name: Clone ops-deployment repo
+        uses: actions/checkout@v4
+        with:
+          repository: notifier/ops-deployment
+          path: ./ops-deployment
+          token: ${{ secrets.BOT_TOKEN }}
+
+      - name: Update backend-api-internal deployment
+        working-directory: ./ops-deployment
+        run: |
+          NEW_TAG=${{ steps.get_tag.outputs.next }}
+          NEW_IMAGE="${{ env.IMAGE_PATH }}:$NEW_TAG"
+          git config user.name "automation-bot"
+          git config user.email "dev@gansejunge.com"
+
+          sed -i "s|ghcr.io/$GHCR_ORG/$IMAGE_NAME:[0-9]\+|$NEW_IMAGE|g" "$OPS_PATH"
+
+          COMMIT_URL="https://git.gansejunge.com/${GITHUB_REPOSITORY}/commit/${GITHUB_SHA}"
+          git add $OPS_PATH
+          git commit -m "Update backend-api image to version $NEW_TAG" -m "Linked build commit: $COMMIT_URL"
+          git push origin $OPS_BRANCH_BASE

src/main.py

@@ -53,9 +53,15 @@ api = FastAPI(
 )
 
 @api.middleware("http")
-async def prometheus_middleware(request, call_next):
-	response = await call_next(request)
-	REQUEST_COUNTER.labels(request.method, request.url.path, response.status_code).inc()
+async def prometheus_middleware(request: Request, call_next):
+	status = 500
+	try:
+		response = await call_next(request)
+		status = response.status_code
+	except Exception:
+		raise
+	finally:
+		REQUEST_COUNTER.labels(request.method, request.url.path, status).inc()
 	return response
 
 def verify_api_key_dependency_internal(db=Depends(get_db), api_key: str = Depends(api_key_header_internal)) -> str:
@@ -78,6 +84,38 @@ async def custom_http_exception_handler(request,exc):
 		content={"detail": exc.detail}
 	)
 
+@api.get("/health", tags=["Health"])
+def return_health(request:Request, db=Depends(get_db)):
+	try:
+		cursor = db.cursor()
+		cursor.execute("SELECT 1")
+		cursor.fetchone()
+		db_status = "ok"
+	except Exception as e:
+		logger.error(f"Health check DB failed: {e}")
+		db_status = "error"
+
+	try:
+		rmq_conn = getattr(request.app.state, "rmq_connection", None)
+		if not rmq_conn or not rmq_conn.is_open:
+			logger.error("Health check RMQ failed: connection closed or missing")
+			rmq_status = "error"
+	except Exception as e:
+		logger.error(f"Health check RMQ failed: {e}")
+		rmq_status = "error"
+
+	overall_status = "ok" if db_status == "ok" and rmq_status == "ok" else "error"
+	status_code = 200 if overall_status == "ok" else 500
+
+	return JSONResponse(
+		status_code=status_code,
+		content={"status": overall_status,
+		"components": {
+			"database": db_status,
+			"rabbitmq": rmq_status
+		},
+		"message": "Service is running" if overall_status == "ok" else "One or more checks failed"}
+	)
 
 @api.post("/internal/receive-notifications")
 def receive_notifications(