[Twisted-Python] AMP WebSockets bridging

Glyph glyph at twistedmatrix.com
Fri Jun 15 15:32:37 EDT 2012

On Jun 15, 2012, at 10:13 AM, Laurens Van Houtven wrote:

> Hi,
> I'm trying to get browsers to communicate with an AMP API.

This is also what <https://launchpad.net/frack> is doing.  I hope that it becomes a common enough practice that there's a library for it :).

> The issue is that while AMP is inherently a binary protocol, WebSockets transfer text (well, that's a lie: there's a binary version, but it's even less widely supported than WebSockets themselves -- and SockJS doesn't support it at all, although it's on the roadmap). So, I need an alternative, preferably 7-bit, serialization for AMP boxes.

Did you immediately discard the obvious solution of "base64 everything"? :)

> An issue I'm running into is an AMP ListOf. With the above code, ListOf still gets translated to a string, and obviously I want it to be a list. When that ListOf has actual data in it, I get the binary representation.

I would recommend implementing an entirely alternate serialization code path; specifically, one which adapts the existing AMP Argument objects to some new interface ('.toJSON()'), with a default adapter that uses the existing toString()/fromString(), and then specific adapters for those interfaces which need modification, like ListOf and Boolean.


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