On 12:47 pm, stefan@grosz.at wrote:
hi!
(sorry, the formatting in my last mail got screwed up. hope this time it works)
i'm currently writing a reverse proxy with twisted and i've a problem with a deferred function in my handleHeader method.
the code looks simplified like this (http://pastie.org/981735):
class MyProxyClient(proxy.ProxyClient): @defer.inlineCallbacks def handleHeader(self, key, value): if key.lower() == 'location': clientCreator = protocol.ClientCreator(reactor, Redis, db=3) redis = yield clientCreator.connectTCP("localhost", 6379) value = yield redis.get('myproxy:hashcode:%s' % value) proxy.ProxyClient.handleHeader(self,key,value)
as the handleHeader caller doesn't wait for a deferred to finish, the location header is added after handleResponseEnd is already called and therefore never makes it to the client.
is there a way to convert the non-blocking redis call to a blocking redis call? i know that there's a blocking client library for redis but i'd rather use only txredis if possible.
The proxy isn't written to deal with what you want to do. Converting the non-blocking call into a blocking one won't fix the problem, it'll just change it. If you want to change the headers that pass through the proxy, you probably need to hook in at a different place, where an asynchronous operation won't mess things up. More generally, `twisted.web.proxy` isn't really well suited for a rewriting proxy. It's barely capable of functioning as a boring pass- through proxy. If you'd like to make your application simpler, you might want to look at ways to make `twisted.web.proxy` more well suited to this task. Jean-Paul