[Twisted-Python] Re: writing back to the connection is blocking my code

[Drew Smathers]

On Fri, Mar 21, 2008 at 8:50 AM, coder_gus <coder_gus at lavabit.com> wrote:
>  How can I send it back to them
>  (having a reference to each client's protocol class) without receiving
>  data, client connecting etc. ?

1. Without receiving data

This is simple.   When a client connects, your protocol can capture
the connection event with connectionMade method on the protocol.
That's when you'll likely store a reference to the protocol instance
on the factory.  If you need to write back to the connection at a
later time, simply call write on the protocol's transport. For
example, a chat server might do something like this:

for c in self.chatters:
   c.transport.write(msg)

I'm guessing that your concern is that write is going to block.  It's not.

2. Client connecting

The client has to connect first - unless you are writing an
application where each participant in the system is known up front -
and you can establish connections with them (no firewalls).

I would suggest rereading these documents carefully - they should
really cover your questions:

http://twistedmatrix.com/projects/core/documentation/howto/servers.html
http://twistedmatrix.com/projects/core/documentation/howto/clients.html

Otherwise, you should provide a more detailed explanation of your use case.

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 d.p.s