Google App Engine通道API客户端的无窗口容器

Question

I would like to write a commandline tool that receives notifications from Google App Engine's Channel API. This seems to be quite straightforward thanks to open JavaScripts VMs such as v8 and js. One problem with this approach, though, is that these VMs do not provide standard js objects such as window and document , which the channel API references. Running such code therefore gives you window/document/.. not found errors.

There seem to be two ways of circumventing this obstacle:

1. To write a lightweight header in javascript to emulate the behavior of the required objects.
2. To edit Google's javascript (/_ah/channel/jsapi) and eliminate references to such objects.

Does anyone know if there are existing implementations of these approaches, or know of a better idea? Furthermore, is there a clean, uncompressed version of the channel API client side javascript code available somewhere?

Answer 1

You can't edit the script used by /_ah/channel/jsapi -- it's only used when the channel is running against the dev app server. When running in production, that script redirects to https://talkgadget.google.com/talkgadget/channel.js

So you're left with emulating the required objects, or just using a hidden browser window. I would opt for the latter, since I think emulating all the DOM calls is going to get very difficult very quickly.