If you run it using uvicorn app:app and then access http://127.0.0.1:8000/docs you will get:
$ uvicorn app:app
INFO: Started server process [******]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: 127.0.0.1:41242 - "GET /docs HTTP/1.1" 200 OK
INFO: 127.0.0.1:41242 - "GET /openapi.json HTTP/1.1" 500 Internal Server Error
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "site-packages/uvicorn/protocols/http/httptools_impl.py", line 411, in run_asgi
result = await app( # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/uvicorn/middleware/proxy_headers.py", line 69, in __call__
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/fastapi/applications.py", line 1054, in __call__
await super().__call__(scope, receive, send)
File "site-packages/starlette/applications.py", line 123, in __call__
await self.middleware_stack(scope, receive, send)
File "site-packages/starlette/middleware/errors.py", line 186, in __call__
raise exc
File "site-packages/starlette/middleware/errors.py", line 164, in __call__
await self.app(scope, receive, _send)
File "site-packages/starlette/middleware/exceptions.py", line 62, in __call__
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
raise exc
File "site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
await app(scope, receive, sender)
File "site-packages/starlette/routing.py", line 758, in __call__
await self.middleware_stack(scope, receive, send)
File "site-packages/starlette/routing.py", line 778, in app
await route.handle(scope, receive, send)
File "site-packages/starlette/routing.py", line 299, in handle
await self.app(scope, receive, send)
File "site-packages/starlette/routing.py", line 79, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File "site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
raise exc
File "site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
await app(scope, receive, sender)
File "site-packages/starlette/routing.py", line 74, in app
response = await func(request)
^^^^^^^^^^^^^^^^^^^
File "site-packages/fastapi/applications.py", line 1009, in openapi
return JSONResponse(self.openapi())
^^^^^^^^^^^^^^
File "site-packages/fastapi/applications.py", line 981, in openapi
self.openapi_schema = get_openapi(
^^^^^^^^^^^^
File "site-packages/fastapi/openapi/utils.py", line 475, in get_openapi
field_mapping, definitions = get_definitions(
^^^^^^^^^^^^^^^^
File "site-packages/fastapi/_compat.py", line 227, in get_definitions
field_mapping, definitions = schema_generator.generate_definitions(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 372, in generate_definitions
self.generate_inner(schema)
File "site-packages/pydantic/json_schema.py", line 547, in generate_inner
json_schema = current_handler(schema)
^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/_internal/_schema_generation_shared.py", line 36, in __call__
return self.handler(__core_schema)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 504, in handler_func
json_schema = generate_for_schema_type(schema_or_field)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 1164, in chain_schema
return self.generate_inner(schema['steps'][step_index])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 547, in generate_inner
json_schema = current_handler(schema)
^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/_internal/_schema_generation_shared.py", line 36, in __call__
return self.handler(__core_schema)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 504, in handler_func
json_schema = generate_for_schema_type(schema_or_field)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 977, in function_plain_schema
return self._function_schema(schema)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 942, in _function_schema
return self.handle_invalid_for_json_schema(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "site-packages/pydantic/json_schema.py", line 2093, in handle_invalid_for_json_schema
raise PydanticInvalidForJsonSchema(f'Cannot generate a JsonSchema for {error_info}')
pydantic.errors.PydanticInvalidForJsonSchema: Cannot generate a JsonSchema for core_schema.PlainValidatorFunctionSchema ({'type': 'with-info', 'function': <bound method BaseModel.validate of <class 'siwe.siwe.SiweMessage'>>})
For further information visit https://errors.pydantic.dev/2.6/u/invalid-for-json-schema
The
SiweMessage
class barfs on a very basic usage with FastAPI, here's a MWE:app.py
:If you run it using
uvicorn app:app
and then accesshttp://127.0.0.1:8000/docs
you will get:This might be related to #39