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Coroutines and asynchronous I/O using enhanced generators from python 2.5, including a enhanced WSGI server.

Project description

Overview
--------
This is a library for network oriented, coroutine based programming.

*cogen*'s goal is to enable writing code in a seamingly synchronous and easy
manner in the form of generators that yield calls and receive the result
from that yield. These calls translate to asynchronous and fast os calls
in *cogen*'s internals.

Notable features
================

* a WSGI server, HTTP1.1 compliant, with asynchronous extensions
* epoll, kqueue, select, i/o completion ports, sendfile behind the scenes
* a couple of usefull classes for putting the coroutine to sleep, wait for
signals, queues, timeouts etc.


Quick introduction
==================
A coroutine is just a generator wrapped in a helper class:

::

from cogen.core.coroutines import coroutine

@coroutine
def mycoro(bla):
result = yield <operation>
result = yield <operation>


* the `operation` instructs the scheduler what to do with the coroutine:
suspend it till something happens, add another coro in the scheduler, raise
a event and so on.
* if a `operation` has a result associated then the yield will return that
result (eg. a string or a (connection, address) tuple) otherwise it will
return the operation instance.

Echo server example
'''''''''''''''''''

::

from cogen.core import sockets
from cogen.core import schedulers
from cogen.core.coroutines import coroutine

@coroutine
def server():
srv = sockets.Socket()
print type(srv)
srv.bind(('localhost',777))
srv.listen(10)
while 1:
print "Listening..."
conn, addr = yield srv.accept()
print "Connection from %s:%s" % addr
m.add(handler, args=(conn, addr))

@coroutine
def handler(sock, addr):
yield sock.write("WELCOME TO ECHO SERVER !\r\n")

while 1:
line = yield sock.readline(8192)
if line.strip() == 'exit':
yield sock.write("GOOD BYE")
sock.close()
return
yield sock.write(line)

m = schedulers.Scheduler()
m.add(server)
m.run()


Documentation
=============

http://cogen.googlecode.com/svn/trunk/docs/cogen.html

Development
============

Takes place at: http://code.google.com/p/cogen/

Grab the latest and greatest from `trunk http://cogen.googlecode.com/svn/trunk/#egg=cogen-dev>`_ with::

easy_install cogen==dev

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