2

我想通过装饰我的 RequestHandler 对象来定义路由，而不是在创建应用程序时为其提供列表。

我的 WSGIApplication 定义如下：

class WSGIApplication(webapp2.WSGIApplication):
    def __init__(self, *args, **kwargs):
        super(WSGIApplication, self).__init__(*args, **kwargs)
        self.router.set_dispatcher(self.__class__.custom_dispatcher)

    @staticmethod
    def custom_dispatcher(router, request, response):
        rv = router.default_dispatcher(request, response)
        if isinstance(rv, basestring):
            rv = webapp2.Response(rv)
        elif isinstance(rv, tuple):
            rv = webapp2.Response(*rv)

        return rv

    def route(self, url, name):
        def outer_wrapped(cls):
            logging.info("Adding route %s to class %s with name %s"
                         % (url, cls, name))
            self.router.add(RedirectRoute(url, cls,
                                          name=name,
                                          strict_slash=True))
            return cls
        return outer_wrapped

在package.utils

我的应用程序定义在package.application

app.yaml 有

application: theapplication
version: 1
runtime: python27
api_version: 1
threadsafe: yes

handlers:
- url: .*
  script: package.main.application
  secure: always

package.main如下：

from package.application import application
from package.pages import pages

package.application如下（使用散列的密钥）：

from package import utils

conf = {}
conf['webapp2_extras.sessions'] = {'secret_key':
    """##############################################"""}

application = utils.WSGIApplication([], config=conf)

这里有几个处理程序来自package.pages：

from package.application import application as app


@app.route('/conversations', 'view_messages')
class Messages(BaseHandler):
    @users.require_login
    def get(self):
        conversations = self.current_user.get_user_conversations()
        return self.render('conversations.slim', conversations=conversations)


@app.route('/', 'index')
class Index(BaseHandler):
    def get(self):
        return self.render('index.slim')

索引页面工作正常，其他一切都是 404，日志简单地说：

INFO     2012-07-23 14:23:46,258 __init__.py:26] /notifications
INFO     2012-07-23 14:23:46,272 dev_appserver.py:2952] "GET /notifications HTTP/1.1" 404 -

我认为这在某种程度上是由于 appengine 的导入缓存阻止了装饰器运行并将它们自己添加到应用程序中造成的。

当然，我陷入了假设我对导致问题的原因有任何线索的陷阱。在尝试每次调度之前，我添加了更多日志语句以输出路由列表，我发现所有路由都在路由器中，正如人们所期望的那样：

    ...
    def custom_dispatcher(router, request, response):
        logging.info(router.match_routes)
        logging.info(router.build_routes)
        rv = router.default_dispatcher(request, response)
    ...

在将我的浏览器指向 /conversations 时，使用以下日志输出：

INFO     2012-08-04 13:16:40,513 utils.py:13] [<Route('/friendship', <class 'package.pages.pages.Friendship'>, name='friendship', defaults={}, build_only=False)>, <Route('/friendship/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/friendship', <class 'package.pages.pages.Friendship'>, name='friendship', defaults={}, build_only=False)>>, '_name': 'friendship'}, build_only=False)>, <Route('/signup', <class 'package.pages.pages.Signup'>, name='signup', defaults={}, build_only=False)>, <Route('/signup/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/signup', <class 'package.pages.pages.Signup'>, name='signup', defaults={}, build_only=False)>>, '_name': 'signup'}, build_only=False)>, <Route('/preferences', <class 'package.pages.pages.UserPage'>, name='user_prefs', defaults={}, build_only=False)>, <Route('/preferences/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/preferences', <class 'package.pages.pages.UserPage'>, name='user_prefs', defaults={}, build_only=False)>>, '_name': 'user_prefs'}, build_only=False)>, <Route('/<username:[a-zA-Z]+>', <class 'package.pages.pages.UserPage'>, name='user_page', defaults={}, build_only=False)>, <Route('/<username:[a-zA-Z]+>/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/<username:[a-zA-Z]+>', <class 'package.pages.pages.UserPage'>, name='user_page', defaults={}, build_only=False)>>, '_name': 'user_page'}, build_only=False)>, <Route('/message', <class 'package.pages.pages.SendMessagePage'>, name='send_message', defaults={}, build_only=False)>, <Route('/message/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/message', <class 'package.pages.pages.SendMessagePage'>, name='send_message', defaults={}, build_only=False)>>, '_name': 'send_message'}, build_only=False)>, <Route('/conversations', <class 'package.pages.pages.Messages'>, name='view_messages', defaults={}, build_only=False)>, <Route('/conversations/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/conversations', <class 'package.pages.pages.Messages'>, name='view_messages', defaults={}, build_only=False)>>, '_name': 'view_messages'}, build_only=False)>, <Route('/conversation/<conversation_id>', <class 'package.pages.pages.ConversationPage'>, name='conversation', defaults={}, build_only=False)>, <Route('/conversation/<conversation_id>/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/conversation/<conversation_id>', <class 'package.pages.pages.ConversationPage'>, name='conversation', defaults={}, build_only=False)>>, '_name': 'conversation'}, build_only=False)>, <Route('/boards', <class 'package.pages.pages.Boards'>, name='view_boards', defaults={}, build_only=False)>, <Route('/boards/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/boards', <class 'package.pages.pages.Boards'>, name='view_boards', defaults={}, build_only=False)>>, '_name': 'view_boards'}, build_only=False)>, <Route('/boards/<board>', <class 'package.pages.pages.BoardPage'>, name='view_board', defaults={}, build_only=False)>, <Route('/boards/<board>/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/boards/<board>', <class 'package.pages.pages.BoardPage'>, name='view_board', defaults={}, build_only=False)>>, '_name': 'view_board'}, build_only=False)>, <Route('/boards/<board>/new_thread', <class 'package.pages.pages.NewThreadPage'>, name='new_thread', defaults={}, build_only=False)>, <Route('/boards/<board>/new_thread/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/boards/<board>/new_thread', <class 'package.pages.pages.NewThreadPage'>, name='new_thread', defaults={}, build_only=False)>>, '_name': 'new_thread'}, build_only=False)>, <Route('/notifications', <class 'package.pages.pages.Notifications'>, name='notifications', defaults={}, build_only=False)>, <Route('/notifications/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/notifications', <class 'package.pages.pages.Notifications'>, name='notifications', defaults={}, build_only=False)>>, '_name': 'notifications'}, build_only=False)>, <Route('/img/<blob_key>', <class 'package.pages.pages.DisplayImagePage'>, name='display_image', defaults={}, build_only=False)>, <Route('/img/<blob_key>/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/img/<blob_key>', <class 'package.pages.pages.DisplayImagePage'>, name='display_image', defaults={}, build_only=False)>>, '_name': 'display_image'}, build_only=False)>, <Route('/', <class 'package.pages.pages.Index'>, name='index', defaults={}, build_only=False)>, <Route('/', <class 'webapp2.RedirectHandler'>, name=None, defaults={'_uri': <bound method RedirectRoute._redirect of <Route('/', <class 'package.pages.pages.Index'>, name='index', defaults={}, build_only=False)>>, '_name': 'index'}, build_only=False)>]
INFO     2012-08-04 13:16:40,513 utils.py:14] {'index': <Route('/', <class 'package.pages.pages.Index'>, name='index', defaults={}, build_only=False)>, 'view_boards': <Route('/boards', <class 'package.pages.pages.Boards'>, name='view_boards', defaults={}, build_only=False)>, 'notifications': <Route('/notifications', <class 'package.pages.pages.Notifications'>, name='notifications', defaults={}, build_only=False)>, 'friendship': <Route('/friendship', <class 'package.pages.pages.Friendship'>, name='friendship', defaults={}, build_only=False)>, 'signup': <Route('/signup', <class 'package.pages.pages.Signup'>, name='signup', defaults={}, build_only=False)>, 'view_messages': <Route('/conversations', <class 'package.pages.pages.Messages'>, name='view_messages', defaults={}, build_only=False)>, 'conversation': <Route('/conversation/<conversation_id>', <class 'package.pages.pages.ConversationPage'>, name='conversation', defaults={}, build_only=False)>, 'send_message': <Route('/message', <class 'package.pages.pages.SendMessagePage'>, name='send_message', defaults={}, build_only=False)>, 'new_thread': <Route('/boards/<board>/new_thread', <class 'package.pages.pages.NewThreadPage'>, name='new_thread', defaults={}, build_only=False)>, 'view_board': <Route('/boards/<board>', <class 'package.pages.pages.BoardPage'>, name='view_board', defaults={}, build_only=False)>, 'display_image': <Route('/img/<blob_key>', <class 'package.pages.pages.DisplayImagePage'>, name='display_image', defaults={}, build_only=False)>, 'user_prefs': <Route('/preferences', <class 'package.pages.pages.UserPage'>, name='user_prefs', defaults={}, build_only=False)>, 'user_page': <Route('/<username:[a-zA-Z]+>', <class 'package.pages.pages.UserPage'>, name='user_page', defaults={}, build_only=False)>}
INFO     2012-08-04 13:16:40,515 __init__.py:26] /conversations
INFO     2012-08-04 13:16:40,533 dev_appserver.py:2952] "GET /conversations HTTP/1.1" 404 -
INFO     2012-08-04 13:16:40,626 dev_appserver.py:2952] "GET /favicon.ico HTTP/1.1" 200 -

我到底没有注意到什么？

4

1 回答 1

0

我有一条路线覆盖了所有其他路线，但在它们上引发了 404（/username 导致用户页面；没有名为“对话”的用户）。我忘记了在切换到装饰器路由方法时让这条路由的优先级最低。

我通过首先使用相同的路由方法构建一个最小的应用程序来解决这个问题，看看它在应用引擎上运行得很好。然后我在处理程序中捕获了 HTTPNotFound 异常，并在它们发生时打印了堆栈跟踪；这清楚地表明这是我的用户页面类的 get 方法中的一行故意抛出 404，那么问题就相当明显了。

于 2012-08-04T15:25:51.457 回答