refactor: split serverless handlers into dedicated GitHub and GitLab Lambda entrypoints

docker/Dockerfile.lambda

@@ -10,9 +10,9 @@ RUN pip install --no-cache-dir mangum==0.17.0
 COPY pr_agent/ ${LAMBDA_TASK_ROOT}/pr_agent/
 
 FROM base AS github_lambda
-CMD ["pr_agent.servers.serverless.serverless_github"]
+CMD ["pr_agent.servers.github_lambda_webhook.lambda_handler"]
 
 FROM base AS gitlab_lambda
-CMD ["pr_agent.servers.serverless.serverless_gitlab"]
+CMD ["pr_agent.servers.gitlab_lambda_webhook.lambda_handler"]
 
 FROM github_lambda

pr_agent/servers/github_lambda_webhook.py

@@ -3,6 +3,8 @@ from mangum import Mangum
 from starlette.middleware import Middleware
 from starlette_context.middleware import RawContextMiddleware
 
+from pr_agent.servers.github_app import router
+
 try:
     from pr_agent.config_loader import apply_secrets_manager_config
     apply_secrets_manager_config()
@@ -14,18 +16,12 @@ except Exception as e:
         # Fail completely silently if log module is not available
         pass
 
-def _create_handler(router):
 middleware = [Middleware(RawContextMiddleware)]
 app = FastAPI(middleware=middleware)
 app.include_router(router)
-    return Mangum(app, lifespan="off")
 
-def serverless_github(event, context):
+handler = Mangum(app, lifespan="off")
-    from pr_agent.servers.github_app import router
-    handler = _create_handler(router)
-    return handler(event, context)
 
-def serverless_gitlab(event, context):
+
-    from pr_agent.servers.gitlab_webhook import router
+def lambda_handler(event, context):
-    handler = _create_handler(router)
     return handler(event, context)

pr_agent/servers/gitlab_lambda_webhook.py

@@ -0,0 +1,27 @@
+from fastapi import FastAPI
+from mangum import Mangum
+from starlette.middleware import Middleware
+from starlette_context.middleware import RawContextMiddleware
+
+from pr_agent.servers.gitlab_webhook import router
+
+try:
+    from pr_agent.config_loader import apply_secrets_manager_config
+    apply_secrets_manager_config()
+except Exception as e:
+    try:
+        from pr_agent.log import get_logger
+        get_logger().debug(f"AWS Secrets Manager initialization failed, falling back to environment variables: {e}")
+    except:
+        # Fail completely silently if log module is not available
+        pass
+
+middleware = [Middleware(RawContextMiddleware)]
+app = FastAPI(middleware=middleware)
+app.include_router(router)
+
+handler = Mangum(app, lifespan="off")
+
+
+def lambda_handler(event, context):
+    return handler(event, context)