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.

复制代码 代码如下:
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:

复制代码 代码如下:
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')