Has anyone created a simple POP3 and SMTP server using TWISTED?

Jp Calderone exarkun at intarweb.us
Tue Mar 18 00:36:41 CET 2003


On Mon, Mar 17, 2003 at 10:45:44PM +0000, Donn Cave wrote:
> Quoth "Steve Holden" <sholden at holdenweb.com>:
> | "Donn Cave" <donn at drizzle.com> wrote in message
> | news:1047616632.623178 at yasure...
> ...
> |> But there are some limitations.  One that comes to mind is that an
> |> open socket doesn't survive across a fork, so you may want to start
> |
> | If this is so, how does inetd work?
> 
> Doesn't.
> 

  You're kidding, right?

> |> with a single-threaded server that deals with each connection one
> |> by one.  That should work for POP and SMTP, though probably will need
> |> a select with timeout in front of all reads, so the occasional stuck
> |> client doesn't jam the works.
> |
> | I'm not sure I can agree with this. Are you suggesting that it isn't
> | possible to concurrently handle multiple connections to the same server
> | port, or am I misunderstanding?
> 
> That is indeed possible - it's Berkeley sockets to that extent.  The 
> problem is only that without fork, you need to use threads, and that
> adds some implementation problems that it seems to me you might
> profitably postpone until at least the 2nd generation.  Unless multi-
> threaded programs are second nature to you already, but then in that
> case you'd probably disregard my advice anyway.  (Using "you" in the
> impersonal sense.)
> 

  This is wrong.  http://python.org/doc/lib/socket-objects.html - See the
setblocking() method.

  I can only assume that such selective ignorance of reality is feigned, and
you simply have a personal dislike of asynchronous and non-blocking network
architectures.

  Jp

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