Pyramid添加Middleware的方法实例

假设我们要添加一个我们自己的Middleware,用来记录每次请求的日志
下面就是一个符合规范的Middleware, 构造函数中接受一个WSGI APP, __call__返回一个WSGI APP.

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

在项目的__init__.py的main函数中， 在config.make_wsgi_app上包上一层我们的Middleware:

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')