[issue1641] asyncore delayed calls feature

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

Now that I think of it maybe some kind of wrapper would still be necessary.
As of right now, we'd do something like this.
At the core we would have:

import asyncore, asynchat, sched

# global
scheduler = sched.scheduler()

while 1:
    asyncore.loop(timeout=1.0, count=1)  # count=1 makes loop() return after 1 loop
    scheduler.run(blocking=False)       
    

Then, every dispatcher can define a scheduled function of its own:


class Client(asynchat.async_chat):
    # an already connected client 
    # (the "connector" code is not included in this example)

    def __init__(self, *args, **kwargs):
        asynchat.async_chat.__init__(self, *args, **kwargs)
        self.set_terminator("\r\n")
        self.set_timeout()
        
    def set_timeout(self):
        self.timeout = scheduler.enter(30, 0, self.handle_timeout)
        
    def reset_timeout(self):
        scheduler.cancel(self.timeout)
        self.set_timeout()
    
    def found_terminator(self):
        scheduler.cancel(self.timeout)
        self.timeout = scheduler.enter(30, 0, self.handle_timeout)
        # do something with the received data...
        
    def handle_timeout(self):
        self.push("400 connection timed out\r\n")
        self.close()
        
    def close(self):
        scheduler.cancel(self.timeout)
        asynchat.async_chat.close(self)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1641>
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