feat(python): return JSON response with Internal Server Error for any…

… exceptions

Part of #48

examples/python/fastapi/postgres/app.py

@@ -1,10 +1,18 @@
-from fastapi import FastAPI
+from fastapi import FastAPI, Request, status
+from fastapi.responses import JSONResponse
 from routes import router
 
 from custom_routes import router as custom_router
 
 app = FastAPI()
 
+@app.exception_handler(Exception)
+async def exception_handler(request: Request, ex: Exception):
+    return JSONResponse(
+        status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+        content={"error": "Internal Server Error"}
+    )
+
 app.include_router(router)
 
 app.include_router(custom_router)

examples/python/fastapi/postgres/custom_routes.py

@@ -6,3 +6,7 @@
 @router.get('/custom/route')
 def customRoute():
     return { "custom": True }
+
+@router.get('/custom/exception')
+def customException():
+    raise RuntimeError('expected error')

src/templates/app.py.ejs

@@ -11,14 +11,22 @@ function removeExtension(filename) {
 }
 
 -%>
-from fastapi import FastAPI
+from fastapi import FastAPI, Request, status
+from fastapi.responses import JSONResponse
 from routes import router
 <% customRouteFilenames.forEach(filename => { %>
 from <%= removeExtension(filename) %> import router as <%= fileName2routerName(filename) %>
 <% }) -%>
 
 app = FastAPI()
 
+@app.exception_handler(Exception)
+async def exception_handler(request: Request, ex: Exception):
+    return JSONResponse(
+        status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+        content={"error": "Internal Server Error"}
+    )
+
 app.include_router(router)
 <% customRouteFilenames.forEach(filename => { %>
 app.include_router(<%= fileName2routerName(filename) %>)