[Twisted-Python] Passing messages from HTTP Request to another factory or protocol

Don Schoeman don at delphexonline.com
Wed Nov 18 16:46:48 EST 2009

Here is what I have done so far...

I have a dequeued collection that can be accessed by all the relevant
classes. On the one end the HTTP Server appends items to this queue when
it receives a valid HTTP request. On the other end, the SSMI client pops
these items from the queue on a 5 seconds "callLater" based deferred and
sends it out over the existing TCP connection.

Now this works, but I'm wondering if there is not a better way.

Kind Regards,
Don Schoeman

Don Schoeman wrote:
> Hi guys,
> I am busy developing a gateway of some sort and have the following
> running so far on the reactor:
> - HTTP Server listening for incoming connections and HTTP requests.
> - LineReceiver client permanently connected to another server.
> (Connection is established at startup)
> What I need to do is to first translate and then pass messages received
> at the HTTP listening end - over to the LineReceiver client. The client
> in turn will pass it on to a server using a custom protocol called SSMI,
> for example:
> Web Browser Requests -> HTTPServer -> SSMIClient -> ServerXYZ
> For the HTTPServer I'm using the classic design where you inherit from
> twisted.web.http.Request for the Protocol, while having
> twisted.web.http.HTTPChannel and twisted.web.http.HTTPFactory inherited
> classes to support it.
> Also, there will only ever be one SSMIClient protocol instance whereas
> the HTTPServer needs to process multiple requests at a time, so it will
> be a many-to-one design.
> What I need to know is how to pass the "packets" received by the
> HTTPServer onto the SSMIClient protocol..? I am assuming one would use
> deferreds, but the twisted.web.http.Request derived class seemingly does
> not have "access" to the Reactor or it's Factory object. But to be
> honest, I'm a little in over my head on this and don't even know how to
> approach this. I don't know whether I should use a FIFO queue to store
> the messages and I don't even know where to keep such a queue. If anyone
> have done something even remotely like this I'd love to get some input
> from you. It will be greatly appreciated!
> Kind Regards,
> Don Schoeman
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