如何修复 Flask 上的“KeyError: 'log_context'”

Question

我正在为我的一台服务器使用旧版本（因为存在一些依赖性）。我在 docker 容器中设置了我的服务器，直到今天它都可以正常工作。当我重建我的图像并重新运行服务时，它收到此错误：

Exception on /messages [GET]

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app

    response = self.full_dispatch_request()

  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1477, in full_dispatch_request

    rv = self.handle_user_exception(e)

  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1379, in handle_user_exception

    return handler(e)

  File "/opt/sync-engine/inbox/api/ns_api.py", line 226, in handle_input_error

    request.environ['log_context']['error'] = error.__class__.__name__

KeyError: 'log_context'

{"module": "inbox.api.srv:28", "level": "error", "event": "Uncaught error thrown by Flask/Werkzeug", "timestamp": "2019-03-27T10:36:55.760581Z", "greenlet_id": 140055343249040}

srv.py (inbox.api.srv):

...

def default_json_error(ex):

    """ Exception -> flask JSON responder """

    logger = get_logger()

    logger.error('Uncaught error thrown by Flask/Werkzeug', exc_info=ex)

    response = jsonify(message=str(ex), type='api_error')

    response.status_code = (ex.code

                            if isinstance(ex, HTTPException)

                            else 500)

    return response

...

ns_api.py：

...

@app.errorhandler(APIException)

def handle_input_error(error):

    # these "errors" are normal, so we don't need to save a traceback

    request.environ['log_context']['error'] = error.__class__.__name__

    request.environ['log_context']['error_message'] = error.message

    response = flask_jsonify(message=error.message,

                             type='invalid_request_error')

    response.status_code = error.status_code

    return response

...

Answer 1

主要原因：里面没有log_context钥匙request.environ要解决此问题，只需初始化log_context密钥request.environ.setdefault('log_context', dict())# etc...request.environ['log_context']['error'] = error.__class__.__name__希望这可以帮助。