[Python] client derived from async_chat

[Python] client derived from async_chat

	Patrick Useldinger
	Aug 18, 2003 at 8:35 pm

Erik Max Francis wrote:

The bigger question is why you're asking the socket to not block when it
appears that you really want it to (since your logic isn't handling the
case when it doesn't).

See my answer to Heiko; it's the class asyncore which handles the
(non-)blocking staff, and I relied on that. Now that I've overridden the
connect() method for my client, it works fine.

Thanks for your help.

-Patrick

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Patrick Useldinger: I should have read some more about sockets before trying to use async_chat; I thought I would get by 'just adding a few methods'. Shame on me ;-) Anyway, what happened is that 'create_socket()' and 'connect()' were called to quickly one after the other; as async_chat (asnycore, actually) sets the socket on creation to non-blocking, my connect failed. I solved the problem by adding a method 'connect()' in my derived class which looks like this: def connect(self,*args): timeOut=self.gettimeout()

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Dieter Maurer: This is as it should be: "setblocking(0)" tells all socket operations not to wait but to return immeadiately. If the operation could not be performed, you receive this exception. Sure. "async" stands for "asynchronous". Your program above uses a "synchronous" programming style: you wait until the socket can perform the operation. Once, this synchronization is done, the operation is performed and your program continues. This style calls for "setblocking(1)". "async_chat" on the other hand uses

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posted	Aug 17, '03 at 9:23p
active	Aug 19, '03 at 8:41p
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[Python] client derived from async_chat

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