[Pyst-users] ValueError: I/O operation on closed file

[Bernd S. <be...@bs...>]

I try to make asterisk wait for a call, answer some numbers, and Hangup.
I also want to run my python3 and pyst 0.8.0 script until the Hangup happens.

I do it in the following way:

After running connect() on asterisk.manager.Manager()
I use register.event() to register a callback for 'Hangup'

Then I change the dialplan for a spcific extension and context with
command("dialplan remove extension ...") and
command("dialplan add extension ...") for each line of

Answer()
Set(TIMEOUT(absolute)=%d)
Set(i=1)
While(True)
SayNumber(${i})
Wait(1)
Set(i=$[${i} + 1])
EndWhile()
Hangup()

Now I start message_loop()

And it works, sometimes without any error.
But sometimes after the Hangup callback is called I get the following  
exception:

Exception in thread Thread-3:
Traceback (most recent call last):
   File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
     self.run()
   File "/usr/lib/python3.7/threading.py", line 865, in run
     self._target(*self._args, **self._kwargs)
   File "/usr/lib/python3/dist-packages/asterisk/manager.py", line  
293, in _receive_data
     for line in self._sock :
   File "/usr/lib/python3.7/socket.py", line 583, in readinto
     self._checkClosed()
ValueError: I/O operation on closed file.

And when I get the exception, in some cases even worse the python  
script hangs.

I already tested this 5 years before with python2 and an older pyst version.
And I believe the Exceptions occur now more often.

The good thing is, that before the python script hangs,
it has already communicated with asterisk. And asterisk works fine.
And so I made a brutal workaround, and kill my PID from the
"Hangup" callback afer waiting a short time.

But this workaround is ugly.

Do you think there is a design error in my algorithm ?
Do you have an idea, what I could try ?


Regards
Bernd


Bernd Schumacher
Communications Media Solutions
Hewlett-Packard GmbH

ber...@hp...