asterisk users - Jan 2016 - No joy with my first AGI Python script

It's very simple but it doesn't work.  Here's the entire script.

#! /usr/bin/python

import sys

env = {}

def comm(cmd):
    sys.stdout.write(cmd.strip() + '\n')
    sys.stdout.flush()
    return sys.stdin.readline().strip()

while 1:
   line = sys.stdin.readline().strip()

   if line == '': break

   key,data = line.split(':')
   if key[:4] == 'agi_':
       key = key.strip()[4:]
       data = data.strip()
       if key: env[key] = data

#comm("Verbose(0,pyast: %s)" % sys.argv)
comm('SAY NUMBER 123 ""')

sys.stderr.write("AGI Environment Dump:\n");
for key in env.keys():
   sys.stderr.write(" -- %s = %s\n" % (key, env[key]))

sys.stderr.flush()

The extension is;

exten => *22,1,Verbose(0,${CHANNEL(peername)} calling 22 TEST)
  same => n,AGI(/home/darcy/pyast,Hello world)
  same => n,Hangup

What happens when I dial it is that the dialplan Verbose statement runs
but nothing else is logged and the number is not said.  When I turn on
AGI debugging I get this:

... (a bunch of agi_ variables)
<SIP/darcy-0000000d>AGI Tx >> agi_arg_1: Hello world
<SIP/darcy-0000000d>AGI Tx >> 
<SIP/darcy-0000000d>AGI Rx << SAY NUMBER 123 ""
<SIP/darcy-0000000d>AGI Tx >> 200 result=0

There is a delay between the last Rx and Tx suggesting that it thinks
that the numbers are being played but I don't hear them.  Also, the
output to stderr does not appear in the logs.

Here is my environment:
 - Asterisk 11.20.0
 - NetBSD 7.0
 - Python 3.4

Thanks in advance for any help or suggestions.


-- 
D'Arcy J.M. Cain
System Administrator, Vex.Net
http://www.Vex.Net/ IM:darcy at Vex.Net
VoIP: sip:darcy at Vex.Net

On Wed, 6 Jan 2016, D'Arcy J.M. Cain wrote:
> It's very simple but it doesn't work.  Here's the entire
script.
>
> #! /usr/bin/python
>
> import sys
>
> env = {}
>
> def comm(cmd):
>    sys.stdout.write(cmd.strip() + '\n')
>    sys.stdout.flush()
>    return sys.stdin.readline().strip()
>
> while 1:
>   line = sys.stdin.readline().strip()
>
>   if line == '': break
>
>   key,data = line.split(':')
>   if key[:4] == 'agi_':
>       key = key.strip()[4:]
>       data = data.strip()
>       if key: env[key] = data
>
> #comm("Verbose(0,pyast: %s)" % sys.argv)
> comm('SAY NUMBER 123 ""')
>
> sys.stderr.write("AGI Environment Dump:\n");
> for key in env.keys():
>   sys.stderr.write(" -- %s = %s\n" % (key, env[key]))
>
> sys.stderr.flush()
>
> The extension is;
>
> exten => *22,1,Verbose(0,${CHANNEL(peername)} calling 22 TEST)
>  same => n,AGI(/home/darcy/pyast,Hello world)
>  same => n,Hangup
>
> What happens when I dial it is that the dialplan Verbose statement runs
> but nothing else is logged and the number is not said.  When I turn on
> AGI debugging I get this:
>
> ... (a bunch of agi_ variables)
> <SIP/darcy-0000000d>AGI Tx >> agi_arg_1: Hello world
> <SIP/darcy-0000000d>AGI Tx >>
> <SIP/darcy-0000000d>AGI Rx << SAY NUMBER 123 ""
> <SIP/darcy-0000000d>AGI Tx >> 200 result=0
>
> There is a delay between the last Rx and Tx suggesting that it thinks
> that the numbers are being played but I don't hear them.  Also, the
> output to stderr does not appear in the logs.
>
> Here is my environment:
> - Asterisk 11.20.0
> - NetBSD 7.0
> - Python 3.4
In no particular order (except #0):

0) Use an existing Python library. Nobody gets it right the first time. I 
wrote my C library 100 years ago, so I don't remember all the specifics of 
the AGI protocol.

1) Is the space after the 'she-bang' significant?

2) Your 'sys.stderr.write' may be violating the AGI protocol. Writing to
stdout definitely does. I don't remember what writing to stderr does.

3) If you dump your AGI environment before 'say number' do you get a 
different outcome?

4) Any chance the 'digits' directory is missing or that your channel 
language is set weird? Does the saynumber() dialplan application work?

5) Can you play any audio to the channel? Does playback(demo-congrats) 
work?

(That was my last straw to grasp -- need another cup of tea.)

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST

On Wed, 6 Jan 2016 12:19:51 -0800 (PST)
Steve Edwards <asterisk.org at sedwards.com>
wrote:
> In no particular order (except #0):
> 
> 0) Use an existing Python library. Nobody gets it right the first
> time. I wrote my C library 100 years ago, so I don't remember all the
> specifics of the AGI protocol.
Are you talking about pyst?  I guess but I am a firm believer in
understanding the technology before I use it.  I learned programming by
depositing bits on an Altair S-100 bus.  Even though I will probably
never get close to that level again I think it made a good foundation.
> 1) Is the space after the 'she-bang' significant?
No.  It does the same whether it is there or not.
> 2) Your 'sys.stderr.write' may be violating the AGI protocol.
Writing
> to stdout definitely does. I don't remember what writing to stderr
> does.
I got that from some example code I found.  I removed it but nothing
changed.
> 3) If you dump your AGI environment before 'say number' do you get
a
> different outcome?
Nope.  That was actually where I started.  I moved it to the end just
in case it was causing a problem.
> 4) Any chance the 'digits' directory is missing or that your
channel
> language is set weird? Does the saynumber() dialplan application work?
OK, it doesn't.  Shouldn't I see an error in the logs though?  It
pauses just like the AGI script but nothing is said and no errors are
printed.
> 5) Can you play any audio to the channel? Does
> playback(demo-congrats) work?
Yes, that works.  Also, "playback(digits/4&digits/5&digits/6)"
works
which tells me that the digits directory is where it is supposed to
be.  Another data point, "SayPhonetic(hello)" also does not work but
there is silence as long as would expect the audio to last, same as
SayNumber.
> (That was my last straw to grasp -- need another cup of tea.)
Interestingly this led me down a different path.  I added this to my
script - comm('SET VARIABLE PYAST "hello world"') and
displayed the
varible in my dialplan and that worked.  Saying a number was just a
way to test the AGI.  I didn't really need audio for my current 
project. Now that I know that I can set variables I can continue.

However, I sure would like to know why SayWhatever isn't working.  I
will start a new thread for that issue.

Thanks for the pointers.

-- 
D'Arcy J.M. Cain
System Administrator, Vex.Net
http://www.Vex.Net/ IM:darcy at Vex.Net
VoIP: sip:darcy at Vex.Net