[asterisk-users] Simplest way of executing a non-blocking (async) python AGI script?
lardconcepts at gmail.com
Sat Jul 1 02:12:09 CDT 2017
Oh wow - thank you SO much Marcelo.
This works perfectly - exactly as I wanted. Don't think I'd have
figured it out, though.
Well, that ticket says "not a bug" if this isn't a bug, then
"behaviour which differs dramatically from that which is expected"
would definitely be the tag.
Again, this fix works, and thank you!
On 30 June 2017 at 23:18, Marcelo Terres <mhterres at gmail.com> wrote:
> Take a look on that:
> Marcelo H. Terres <mhterres at gmail.com>
> IM: mhterres at jabber.mundoopensource.com.br
> On 30 June 2017 at 22:23, Jonathan H <lardconcepts at gmail.com> wrote:
>> OK, I give up and come grovelling, "Fork" was suggested at 18:23, it's
>> now 22:20 and I have been through 4 different methods, all block with
>> a 2 second delay before returning to dialplan.
>> Here are just some of the examples I have tried, as as per the
>> suggestions, I am closing all possible outputs in the forked process.
>> This is the most likely looking code based on the examples. I would
>> really, really appreciate a couple of pointers as to where I might be
>> going wrong:
>> #! /usr/bin/env python3
>> # -*- coding: utf-8 -*-
>> import multiprocessing as mp
>> import time
>> import sys
>> import os
>> #from asterisk.agi import AGI
>> #agi = AGI()
>> def f(name):
>> os.close(0) # close C's stdin stream
>> os.close(1) # close C's stdout stream
>> os.close(2) # close C's stderr stream
>> f = open('/var/lib/asterisk/agi-bin/tns/testing/testout.txt', 'w')
>> if __name__ == '__main__':
>> print('before process')
>> q = mp.Queue()
>> p = mp.Process(target=f, args=('asterisk',))
>> On 30 June 2017 at 19:59, J Montoya or A J Stiles
>> <asterisk_list at earthshod.co.uk> wrote:
>>> On Friday 30 Jun 2017, Jonathan H wrote:
>>>> What's the simplest, easiest quickest least-code way of firing off an AGI
>>>> with some variable, and then returning to the dialplan?
>>> You have to use the "fork" command. This starts a copy of the process with
>>> all the same internal state including variables and filehandles. The command
>>> returns a non-zero value (which is the PID of the child process; you may need
>>> this, if you plan to outlive your children and have to clear their entries
>>> from the process table) to the parent process, and zero to the child process.
>>> So in the parent, you exit and return to the dialplan; and in the child, you
>>> close STDIN, STDOUT and STDERR (so no process is waiting for you to produce
>>> output), then just take your time doing what you have to. The parent is
>>> already long dead by this time, so exiting goes nowhere.
>>>> I've seen people talking about fastAGI, stasis, python ASYNC... all seems
>>>> rather complicated. I feel I must be missing something embarrassingly
>>>> obvious - isn't there just the equivalent of the unix shell's "&"?!
>>> Yes, fork! That is what the "&" operator is using "under the bonnet".
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