cogen 0.1.5

Notable features

• a WSGI server, HTTP1.1 compilat, with asynchronous extensions

• use epoll, kqueue where supported, select based otherwise

• a Queue with the same interface as the standard library Queue, but for coroutines

Quick introduction

Programming with cogen library should be straightforward, similar with programming threads but without all the problems. A coroutine is just a generator wrapped in a operation handling class:

@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.

• the operations are split up in 2 modules: events and sockets * the operations from sockets are related to network, like reading and writing, and these are done asynchronously but your code in the coroutine will see them as a regular synchronous or blocking call.

• the operations from events are related to signals and coroutine/scheduler management.

• 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.

@coroutine
def server():
    srv = sockets.Socket()
    srv.setblocking(0)
    srv.bind(('localhost',777))
    srv.listen(10)
    while 1:
        print "Listening..."
        conn, addr = yield sockets.Accept(srv)
        print "Connection from %s:%s" % addr
        m.add(handler, conn, addr)

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

    while 1:
        line = yield sockets.ReadLine(sock, 8192)
        if line.strip() == 'exit':
            yield sockets.Write(sock, "GOOD BYE")
            sock.close()
            return
        yield sockets.Write(sock, line)

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

Documentation

Hosted at: http://code.google.com/p/cogen/wiki/Docs_Cogen

Development

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

Grab the latest and greatest from trunk with:

easy_install cogen==dev