python - 如何为金字塔/塔架 2 编写日志中间件？

Question

我想使用 mongodb 或 redis 为金字塔/塔中的用户保留日志，但找不到有关创建中间件的文档。我该怎么做？

Answer 1

标准中间件

class LoggerMiddleware(object):
    '''WSGI middleware'''

    def __init__(self, application):

        self.app = application

    def __call__(self, environ, start_response):

        # write logs

        try:
            return self.app(environ, start_response)
        except Exception, e:
            # write logs
            pass
        finally:
            # write logs
            pass

在金字塔创建应用程序代码中：

from paste.httpserver import serve
from pyramid.response import Response
from pyramid.view import view_config

@view_config()
def hello(request):
    return Response('Hello')

if __name__ == '__main__':
    from pyramid.config import Configurator
    config = Configurator()
    config.scan()
    app = config.make_wsgi_app()

    # Put middleware
    app = LoggerMiddleware(app)

    serve(app, host='0.0.0.0')

Answer 2

找不到任何文档是完全奇怪的，因为日志记录模块的 Python 文档非常冗长和完整：

http://docs.python.org/library/logging.html#handler-objects

您需要实现自己的 MongoDBHandler 并通过 pymongo 将 emit() 方法附加到 MongoDB。

Answer 3

在这种情况下，另一个选择是根本不使用中间件，而只是在金字塔中使用 BeforeRequest 事件。

from pyramid.events import NewRequest
import logging

def mylogger(event):
    request = event.request
    logging.info('request occurred')

config.add_subscriber(mylogger, NewRequest)

Answer 4

如果有人偶然发现这一点，您可以使用充当中间件的 Tween。您可以将日志记录放在调用方法中。

class simple_tween_factory(object):
def __init__(self, handler, registry):
    self.handler = handler
    self.registry = registry

    # one-time configuration code goes here

def __call__(self, request):
    # code to be executed for each request before
    # the actual application code goes here

    response = self.handler(request)

    # code to be executed for each request after
    # the actual application code goes here

    return response

https://docs.pylonsproject.org/projects/pyramid/en/latest/narr/hooks.html#registering-tweens