Re: [google-appengine] Channel API outside browsers
On Wednesday, November 3, 2010 4:20:19 AM UTC, Robert Kluin wrote:Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/tools/dev-channel-js.js The SDK code uses a DevChannel implementation goog.exportSymbol(goog.appengine.Channel, goog.appengine.DevChannel); which is NOT doing COMET or similar, it simply polls a special page (/dev) once a second or so. But running against the real production AppEngine, /_ah/channel/jsapi returns a 302 redirect to http://talkgadget.google.com/talkgadget/channel.js That code is minified and so not so easy to examine, but I expect the Channel object implemented there does proper COMET style long queries - you could watch what happens from the browser and see what's sent back and forth, but looking at the (current) SDK may help you understand the API calls but won't show you anything about how it's implemented in production. -- Tim -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Channel API outside browsers
On Wednesday, November 3, 2010 4:20:19 AM UTC, Robert Kluin wrote:Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/tools/dev-channel-js.js The SDK code uses a DevChannel implementation goog.exportSymbol(goog.appengine.Channel, goog.appengine.DevChannel); which is NOT doing COMET or similar, it simply polls a special page (/dev) once a second or so. But running against the real production AppEngine, /_ah/channel/jsapi returns a 302 redirect to http://talkgadget.google.com/talkgadget/channel.js That code is minified and so not so easy to examine, but I expect the Channel object implemented there does proper COMET style long queries - you could watch what happens from the browser and see what's sent back and forth, but looking at the (current) SDK may help you understand the API calls but won't show you anything about how it's implemented in production. -- Tim -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Channel API outside browsers
It will let you simplify _when_ you run inside a web browser. That's what the Channel API is designed for. For pushing data to other types of clients (automated services, bots, etc.) there already exist good solutions - XMPP, PubSubHubbub, plain HTTP POSTs. When you run in a browser, the complexity is hidden in the Channel API javascript. Only a simplistic interface similar to WebSockets is exposed to you as developer. But the complexity hidden underneath in the Channel API client library is pretty big: - first, there is HTTP long-polling used to emulate a persistent connection - second, an undocumented protocol is used to frame the separate messages; it's probably ProtocolBuffers-based - third, an invisible Iframe together with a Closure XPC channel is used to bypass the same-origin javascript policy The last one is not necessary if you create an out-of-browser client. But the first two are complex enough (primarily the first one). Considering that you have other (good) options, it would be quite crazy to go down that road. On Wed, Nov 3, 2010 at 6:37 AM, Robert Kluin robert.kl...@gmail.com wrote: Are the data-exchanges overly complicated? I have used XMPP for an app, I was hoping the channel API would let me simplify. Robert On Wed, Nov 3, 2010 at 00:29, Peter Petrov onest...@gmail.com wrote: Forget about emulating it outside of a browser. Your best bet is using a separate mechanism for sending messages to non-browser clients - for example make a HTTP postback, or send a XMPP message. On Wed, Nov 3, 2010 at 6:20 AM, Robert Kluin robert.kl...@gmail.com wrote: Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/tools/dev-channel-js.js Robert On Tue, Nov 2, 2010 at 08:41, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.comgoogle-appengine%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.comgoogle-appengine%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.comgoogle-appengine%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.comgoogle-appengine%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Channel API outside browsers
I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Channel API outside browsers
Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/tools/dev-channel-js.js Robert On Tue, Nov 2, 2010 at 08:41, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Channel API outside browsers
Forget about emulating it outside of a browser. Your best bet is using a separate mechanism for sending messages to non-browser clients - for example make a HTTP postback, or send a XMPP message. On Wed, Nov 3, 2010 at 6:20 AM, Robert Kluin robert.kl...@gmail.com wrote: Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/tools/dev-channel-js.js Robert On Tue, Nov 2, 2010 at 08:41, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.comgoogle-appengine%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.comgoogle-appengine%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Channel API outside browsers
Are the data-exchanges overly complicated? I have used XMPP for an app, I was hoping the channel API would let me simplify. Robert On Wed, Nov 3, 2010 at 00:29, Peter Petrov onest...@gmail.com wrote: Forget about emulating it outside of a browser. Your best bet is using a separate mechanism for sending messages to non-browser clients - for example make a HTTP postback, or send a XMPP message. On Wed, Nov 3, 2010 at 6:20 AM, Robert Kluin robert.kl...@gmail.com wrote: Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/google/appengine/tools/dev-channel-js.js Robert On Tue, Nov 2, 2010 at 08:41, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
