api error handler

modules/api/api.py

@@ -6,8 +6,11 @@ import uvicorn
 from threading import Lock
 from io import BytesIO
 from gradio.processing_utils import decode_base64_to_file
-from fastapi import APIRouter, Depends, FastAPI, HTTPException, Request, Response
+from fastapi import APIRouter, Depends, FastAPI, Request, Response
 from fastapi.security import HTTPBasic, HTTPBasicCredentials
+from fastapi.exceptions import HTTPException
+from fastapi.responses import JSONResponse
+from fastapi.encoders import jsonable_encoder
 from secrets import compare_digest
 
 import modules.shared as shared
@@ -90,6 +93,16 @@ def encode_pil_to_base64(image):
     return base64.b64encode(bytes_data)
 
 def api_middleware(app: FastAPI):
+    rich_available = True
+    try:
+        import anyio # importing just so it can be placed on silent list
+        import starlette # importing just so it can be placed on silent list
+        from rich.console import Console
+        console = Console()
+    except:
+        import traceback
+        rich_available = False
+
     @app.middleware("http")
     async def log_and_time(req: Request, call_next):
         ts = time.time()
@@ -110,6 +123,36 @@ def api_middleware(app: FastAPI):
             ))
         return res
 
+    def handle_exception(request: Request, e: Exception):
+        err = {
+            "error": type(e).__name__,
+            "detail": vars(e).get('detail', ''),
+            "body": vars(e).get('body', ''),
+            "errors": str(e),
+        }
+        print(f"API error: {request.method}: {request.url} {err}")
+        if not isinstance(e, HTTPException): # do not print backtrace on known httpexceptions
+            if rich_available:
+                console.print_exception(show_locals=True, max_frames=2, extra_lines=1, suppress=[anyio, starlette], word_wrap=False, width=min([console.width, 200]))
+            else:
+                traceback.print_exc()
+        return JSONResponse(status_code=vars(e).get('status_code', 500), content=jsonable_encoder(err))
+
+    @app.middleware("http")
+    async def exception_handling(request: Request, call_next):
+        try:
+            return await call_next(request)
+        except Exception as e:
+            return handle_exception(request, e)
+
+    @app.exception_handler(Exception)
+    async def fastapi_exception_handler(request: Request, e: Exception):
+        return handle_exception(request, e)
+
+    @app.exception_handler(HTTPException)
+    async def http_exception_handler(request: Request, e: HTTPException):
+        return handle_exception(request, e)
+
 
 class Api:
     def __init__(self, app: FastAPI, queue_lock: Lock):

requirements.txt

@@ -30,3 +30,4 @@ GitPython
 torchsde
 safetensors
 psutil
+rich