如何重置 Bottle 中每个请求的自定义请求属性？

Question

这是我的插件的简化版本：

class MyPlugin(object):
    ''' My plugin.
    '''

    api = 2

    def __init__(self):
        self.time = datetime.now()

    def apply(self, callback, route):
        request.my_attr = self.time

        @wraps(callback)
        def wrapper(*args, **kwargs):
            cb_response = callback(*args, **kwargs)
            return cb_response
        # Forget any cached values.
        route.reset()
        # Replace the route callback with the wrapped one.
        return wrapper

my_plugin = MyPlugin()

@route('/my_route', method=['GET', 'POST'], apply=[my_plugin])
def my_route():
    """ Http Handler.
    """
    response.content_type = 'text/txt;'
    time = request.my_attr
    print(time)

run(host=HOST, port=PORT, debug=DEBUG, quiet=QUIET)

它适用于第一个请求，但对所有后续请求都失败：

# ./my_app.py
Bottle v0.12.9 server starting up (using WSGIRefServer())...
Listening on http://0.0.0.0:8888/
Hit Ctrl-C to quit.

2016-10-25 14:51:29.975600
46.101.xx.yy - - [25/Oct/2016 14:51:33] "POST /my_route HTTP/1.1" 200 1569
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/bottle.py", line 1391, in __getattr__
    var = self.environ['bottle.request.ext.%s'%name]
KeyError: 'bottle.request.ext.my_attr'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/bottle.py", line 862, in _handle
    return route.call(**args)
  File "/usr/local/lib/python3.4/dist-packages/bottle.py", line 1732, in wrapper
    rv = callback(*a, **ka)
  File "./my_app.py", line 245, in wrapper
    cb_response = callback(*args, **kwargs)
  File "./my_app.py", line 264, in my_route
    time = request.my_attr
  File "/usr/local/lib/python3.4/dist-packages/bottle.py", line 1394, in __getattr__
    raise AttributeError('Attribute %r not defined.' % name)
AttributeError: Attribute 'my_attr' not defined.
46.101.xx.yy - - [25/Oct/2016 14:51:37] "POST /my_route HTTP/1.1" 500 760

如何在每次请求时重置 request.my_attr？

Answer 1

不清楚您的最终目标是什么，或者您所说的 "reset request.my_attr on each request" 的确切含义（因为您在其他地方提到了 "cached values,"，这意味着您做打算做一些缓存）。但这一行似乎很清楚

request.my_attr = self.time

放错地方了。你可能想把它移到你的 wrapper 函数中，因为（大概）然后意图是在每个请求上将该行设为运行:

    @wraps(callback)
    def wrapper(*args, **kwargs):
        request.my_attr = self.time
        cb_response = callback(*args, **kwargs)
        return cb_response

我不确定这对我是否有意义，但我不知道您的目标是什么，所以也许这确实是您的意图。在任何情况下，将行移动到 wrapper 都会更正 HTTP 500。希望对您有所帮助！如果没有，请添加一两行描述您要完成的任务，我会尽力提供帮助。

如何重置 Bottle 中每个请求的自定义请求属性？

How to reset custom request attribute on each request in Bottle?

python

bottle

python-3.4