如何查看graphene-django DEBUG日志

Question

我在使用 Graphene 和 Django 查看DEBUG级别日志时遇到问题。 我在settings.py设置了以下内容：

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['console'],
            'level': 'DEBUG'
        },
        'django.request': {
            'handlers': ['console'],
            'level': 'DEBUG'
        },
    },
}

但是，当我尝试查看 Django 服务器的日志时，我看到的是：

❯❯❯ kubectl logs -f server-6b65f48895-bmp6w server
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, django_celery_beat, django_celery_results, server, sessions, social_django
Running migrations:
  No migrations to apply.
Performing system checks...

System check identified no issues (0 silenced).
October 08, 2018 - 23:59:00
Django version 2.0.6, using settings 'backend.settings'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113
"POST /graphql HTTP/1.1" 400 113

如何查看DEBUG级别的日志以找出为什么我的服务器持续服务 400 秒？

我没有设置 Django DEBUG环境变量。 我正在尝试调试生产问题。

Answer 1

前一阵子我被同样的问题搞砸了，来到了解决方法：

from promise import is_thenable


class DebugMiddleware(object):
    def on_error(self, error):
        print(error)

    def resolve(self, next, root, info, **args):
        result = next(root, info, **args)
        if is_thenable(result):
            result.catch(self.on_error)

        return result

并告诉graphene将其用作中间件：

GRAPHENE = {
    ...
    'MIDDLEWARE': [
        'path.to.containing.module.DebugMiddleware',
        ...
    ]
}

在这里，您可以访问解决时出现的错误。

最初的问题（没有模块日志记录）可能是由于禁用了graphql记录器引起的，但是我在这个方向上的探索没有任何结果:(

Answer 2

这是我用来捕获 graphql 查询 400 错误的快速中间件。

在settings.py

MIDDLEWARE = [
    "path_to_file_below.GraphqlErrorLogMiddleware",
    ...
]

# Some basic logging from the Django Documentation
LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "handlers": {"console": {"class": "logging.StreamHandler"}},
    "root": {"handlers": ["console"], "level": "DEBUG"},
}

class GraphqlErrorLogMiddleware(object):
    """
    Logs errors for invalid graphql queries
    """

    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        response = self.get_response(request)

        try:
            if (
                400 >= response.status_code
                and response.status_code != 403
                and "graphql" in request.path.lower()
            ):
                response_json = json.loads(response.content)

                if "errors" in response_json:
                    log_response(
                        message=f"Graphql Error: {response_json['errors']}",
                        response=response,
                        level="error",
                    )
        except Exception as e:
            logging.debug(f"Error logging Graphql Error: {e}")

        return response

Answer 3

基于@donnyy 的回答，我想出了以下实现

from promise import is_thenable
from functools import partial
import logging
import sys
import json
logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)

class DebugMiddleware(object):
    def on_error(self, error ,info):
        log_request_body(info)

    def resolve(self, next, root, info, **args):

        result = next(root, info, **args)
        if is_thenable(result):
            result.catch(partial(self.on_error, info=info))
        return result


def log_request_body(info):
    body = info.context._body.decode('utf-8')
    try:
        json_body = json.loads(body)
        logging.error(' User: %s \n Action: %s \n Variables: %s \n Body: %s',
                      info.context.user,
                      json_body['operationName'],
                      json_body['variables'],
                      json_body['query'])
    except:
        logging.error(body)