Mailman 3 May 2010 - Twisted-web

Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

3 2

Deferred in proxy.ProxyClient.handleHeader (reformatted)
by Ing. Stefan Grosz, BSc 28 May '10

28 May '10

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. regards, stefan -- Stefan Grosz <stefan(a)grosz.at> Stadtaustellungs-, Gemeindeausstellungs-, Stadtinformations- und Gemeindeinformationsplanungs GmbH A-1100 Wien, Buchengasse 42 Mobil: +43 650 2643435 Fax: +43 7243 57435 http://www.stadtausstellung.at

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Deferred in proxy.ProxyClient.handleHeader
by Ing. Stefan Grosz, BSc 28 May '10

28 May '10

hi! 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: 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. regards, stefan -- Stefan Grosz <stefan(a)grosz.at> Stadtausstellungs-, Gemeindeausstellungs-, Stadtinformations- und Gemeindeinformationsplanungs GmbH A-1100 Wien, Buchengasse 42 Mobil: +43 650 2643435 Fax: +43 7243 57435 http://www.stadtausstellung.at

1 0

sendLine and connectionLost question
by DAVID JIMENEZ CARRASCO 27 May '10

27 May '10

Hi all, I'm trying to write a typical chat server application with twisted. At this moment, all is working fine except for some strange behaviour with sendLine and connectionLost funcs. Let me explain the problem: - I have a server on the internet. - I connect two PCs (2 clients) from the same LAN through a router to that server - All is working fine until I disconnect the LAN of one of those PC (The client is disconnected but the server doesn't know about it). Just to test a typical wireless disconnection without closing sockets, etc... - After disconnecting I try to send some messages through the remaining clients to all clients through this function: def sendMessageToAllClients(self, mesg,reqClient): for client in self.clientProtocols: dataLength = str(len(mesg)) if (len(dataLength) < 8): dif = 8 - len(dataLength) dataLength = "0"*dif + dataLength print "Enviando a:",str(client) client.sendLine(dataLength+mesg) client.clearLineBuffer() As you can see, I send a message to all clients, including the one disconnected because the server doesn't know at this moment that the client is "out". I'm able to send 6 or 7 messages to the remaining client but after that, the connection get lost. I would expect to have a connectionLost with the client offline but actually I got a connectionLost in both clients and I don't know why. The server disconnect both clients with "non clean fashion". Any help or advice would be highly appreciated. Regards, David ------------------------------------------------------------------------------------------------------------------------------------------------ Este mensaje es confidencial y atañe exclusivamente a las personas a las que va dirigido. Cualquier opinión en el contenida, es exclusivo de su autor y no representa necesariamente la opinion de UNIPOST, S.A. Si Ud. no es el destinatario del mensaje, considerese advertido que lo ha recibido por error y que cualquier difusión o copia estan terminantemente prohibidos. Si ha recibido por error, por favor comuniquelo a UNIPOST, S.A. al número +34 93 223 25 52 o correo electrónico a <support(a)unipost.es>. This e-mail is confidential and intended solely for the use of the individual to whom it is addressed. Any opinions presented are solely those of the author and do not necessarily represent those of UNIPOST, S.A. If you are not the intended recipient, be advised that you have received this e-mail in error and that dissemination, forwarding or copying of this e-mail is strictly prohibited. If you have received this e-mail in error please notify it to UNIPOST, S.A. by telephone on number +34 93 223 25 52 or by e-mail to <support(a)unipost.es>. ------------------------------------------------------------------------------------------------------------------------------------------------

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SOAPPublisher: How to work with <soap:Header> ?
by Sosnovskiy Alexander 20 May '10

20 May '10

Hi all! I need to create a service which will set headers into response, but if to be honest have no idea of how to achieve this goal :(

1 0

gzipped content
by Werner Thie 17 May '10

17 May '10

Hi There must be an easy answer for this, it just eludes me. After some digging in the source code it looked like this will be handled automatically for static resources in twisted.web Hitting http://www.gidnetwork.com/tools/gzip-test.php shows that this is not the case, response headers for my LivePage site are set to status HTTP/1.0 200 OK date Sun, 16 May 2010 00:50:29 GMT cache-control no-store, no-cache, must-revalidate content-type text/html; charset=UTF-8 pragma no-cache server TwistedWeb/10.0.0 Is there an easy way to switch to gzipped content, helping a lot with delivering more and more JScript code to the user (obfuscated and all I could squeeze out another factor of three) Thank you, Werner

4 3

Sessions and stored objects
by Oscar Campos 13 May '10

13 May '10

Greetings. I'm storing User objects in my sessions, those User objects can perform some actions at application if they have permissions in the ACL. When I need to do logout with any of them I just use the expire method from the Session object and this works nice using the notufyOnExpire callback, but I'm just curious. Is there any way that I can call Session methods from store session objects? user.logout() should look nicer. Ty. -- Oscar Campos Ruiz-Adame -oscar.campos(a)open-phoenix.com Consultor - Consultant Open Phoenix IT Consultoría Tecnológica - IT Consulting _________________________________________________ Tel. +34 644569088 http://www.open-phoenix.com

2 1

Newbie question : client connection lost
by Sebastien PASTOR 11 May '10

11 May '10

Hi ! I am very new at Twisted. What i am trying to achieve is a simple web service using basic HTTTP GET and POST requests. My big requirement is being able to detect when the connection is closed client side. Bottom line being : i want to know that each GET or POST result has been successfully or not sent to the client. I could not managed to do that using WSGI. Is there way to try: catch sockets exception using Twisted or should i go the async way and use notifyFinish() and friends ? Thanks in advance ! Seb

3 7

How can I direct a user to a "you are being logged off" page?
by markscottwright＠gmail.com 10 May '10

10 May '10

I'm using twisted web (not nevow) in an application right now. I'm handling expiration by having a LogonState Session variable, which has an is_logged_in member that defaults to False. All requests are checked for this and redirected to my logon page if is_logged_in is not true. This is all working fine, but unfortunately, it means that timeouts are abrupt - you are just re-directed to a logon page with no warning the next time you try to access a resource after session timeout. Session expiration callbacks don't seem that useful here. I'll be notified, but then the session is gone and I no longer have any way of knowing if the next request is from someone who once had a valid session, but no longer does. How do others deal with this issue?

2 1