[PATCH 2 of 2] commandserver: use selector2

Jun Wu quark at fb.com
Sat Jul 15 00:18:48 EDT 2017


Excerpts from Yuya Nishihara's message of 2017-07-15 12:37:39 +0900:
> On Fri, 14 Jul 2017 20:27:27 -0700, Jun Wu wrote:
> > # HG changeset patch
> > # User Jun Wu <quark at fb.com>
> > # Date 1500089181 25200
> > #      Fri Jul 14 20:26:21 2017 -0700
> > # Node ID a6545c15171810059596259f60574011184c3412
> > # Parent  5664763de82b48ca6882bbb624d01d467b4920d0
> > # Available At https://bitbucket.org/quark-zju/hg-draft 
> > #              hg pull https://bitbucket.org/quark-zju/hg-draft  -r a6545c151718
> > commandserver: use selector2
> > 
> > Previously, commandserver was using select.select. That could have issue if
> > _sock.fileno() >= FD_SETSIZE (usually 1024), which raises:
> > 
> >   ValueError: filedescriptor out of range in select()
> 
> Can we get around it without vendoring selector2, by using poll() for example?

poll is not available on OS X, which we need to support.

I tried to write some lightweight wrapper around them, then discovered I
was basically reinventing things. SocketServer has too many issues and is
over complicated for our usecase, but the Python 3 "selectors" interface
looks not that bad. So I think it's okay to reuse a mature library.

If it still looks too complicated, I think we can remove some selectors,
like removing JythonSelectSelector, epoll, devpoll.


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