How can I implement Comet / Server push in Google App Engine in Python?
A:
This is not a simple question to answer. Reading this wiki might give you a hint as to the implementation you'd like to undertake. You might have to write the HTTP server yourself to implement sockets which remain open.
Ben S
2009-08-16 19:37:51
I can't write my own HTTP server in Google apps
Lev
2009-08-17 04:09:20
+8
A:
At this time, I would rule out doing Comet in App Engine (any language). Comet is based on long-lived HTTP connections, and App Engine will time out any single connection in about 30 seconds or so at most; it's hard to conceive of a worse match!
Alex Martelli
2009-08-16 20:14:58
+2
A:
Comet (or something like it - XMPP API) is on the google app engine roadmap. For now, stay away.
mainsocial
2009-08-17 02:14:21
this is not helpful, although already released, the appengine can be used to build chat bots with this API, but it still doesn not allow for long-polling
Bartosz Radaczyński
2009-09-09 20:23:49
you're right. another server is needed to translate the client-side long polling to XMPP messages. the recently release tornado framework looks like a good option!
mainsocial
2009-09-12 00:17:58
+3
A:
I found this article which explains a sort of comet. It is not really but you can simulate realtime with it. It uses an external service
http://www.brightyellowcow.com/blog/Comet-AJAX-push-using-PHP-or-Google-App-Engine.html
Alfred
2009-10-19 18:45:08
A:
30 seconds is more than enough,either way you should return a no-op message when a time passed a no new events occur,this prevents client timeouts and is done by everybody who does comet. just send the request,in the server make it wait until a event or timeout after 25 seconds.
Uriel Katz
2010-05-06 21:56:36
+31
A:
We just announced the Channel API to do comet push with App Engine apps: http://googleappengine.blogspot.com/2010/05/app-engine-at-google-io-2010.html
If you're at Google IO, I'll be talking about this at 1pm tomorrow (on the APIs track): http://code.google.com/events/io/2010/sessions/building-real-time-apps-app-engine-feed-api.html
Here's the YouTube video of the session: http://www.youtube.com/watch?v=oMXe-xK0BWA
Moishe
2010-05-19 23:43:54
I'm sorry I had to miss that talk yesterday (too many good overlapping talks!). Any news on when we'll see documentation of this feature or when it'll be available for us to use?
npdoty
2010-05-22 00:44:57
The talk itself will be on YouTube next week (I think), and it contains details of the API. No specific dates for launch, but if you want to sign up for trusted tester you can go do so here: https://spreadsheets.google.com/viewform?formkey=dGFxQ1A4T1BSYWxNdFlYVFhUcmg2amc6MQ
Moishe
2010-05-23 19:02:50
As soon as the videos are posted to the Google IO site, I'll post a link here. (I am simultaneously looking forward to and dreading seeing myself on video...)
Moishe
2010-05-27 16:59:09
Wondering if you could give us an estimate when we can play with this :)?
Alfred
2010-06-21 09:25:15
+1
A:
I would have commented on Moishe's answer , however my reputation doesn't seem to allow that... Here's that video to the Google I/O talk that describes the Channel API (only available to trusted developers for the moment, soon to be out)
Conrado
2010-06-09 12:06:30
I've been invited to use the pubsubhubbub Feed API v2, by Google. It is now in closed beta.The docs and signup form are here: http://code.google.com/apis/feed/push/
Conrado
2010-09-21 18:32:57
A:
Looking inside the App Engine 1.3.8-pre release, I see the Channel API service stub and more code. So it looks like we can start trying it out locally.
kvdb
2010-10-12 20:19:03