AGI script consume API

Asterisk Asterisk APIs
1

Hello!
I need to consume an API to check a number against a service from Google and based on the return, make a decision in the dialplan.

I tried calling PHP, Shell and even Python scripts via the AGI and System in the dialplan, but it doesn’t work. While the channel is “up”, if I check the AGISTATUS, it’s always “APPERROR”.

When I call the script from the terminal and inform the parameters, it works perfectly. When I call the script via dialplan, it doesn’t.

What am I missing?

2

Typical problems are file permissions (need read and execute for the user running Asterisk, also SELINUX could cause problems), different environments, and in particular different PATH settings, #! lines with relative file names for the interpreter.

Less likely is that you have run Asterisk in a change rooted environment.

3

Thanks david.
I’m running asterisk as root and the folders and files are set with the correct permissions. I’m not executing SELINUX and I don’t think there are PATH differences. I’ll show some parts of my dialplan and script. If I could at least check the errors somewhere, but I don’t think that asterisk or python are writing the errors in any file:

DIALPLAN:

same=>n,System(python3 /var/lib/asterisk/agi-bin/python/bv-vcall-python-command-line-examples/check_vcall_device_reachable_sample.py ${DESTINO} ${CANAL})

I tried with and without the python3 at the beggining, the result is the same.

SCRIPT:

from api_helper import ApiHelper

from client_library import businesscalls_v1_client as client
from client_library import businesscalls_v1_messages as messages

import argparse
import os

def get_Arguments():
  parser = argparse.ArgumentParser()
  parser.add_argument("number")
  parser.add_argument("channel")
  args = parser.parse_args()
  return args

def check_vcall_device_reachable(device_number: str):
  request = messages.GoogleCommunicationsBusinesscallsV1CheckVcallDeviceReachableRequest()
  request.deviceNumber = device_number
  return ApiHelper().get_api_client().CheckVcallDeviceReachable(request)

if __name__ == '__main__':
    args = get_Arguments()
    device_reachability = check_vcall_device_reachable(args.number)
    if 'UNREACHABLE' in str(device_reachability):
        os.system('asterisk -rx "dialplan set chanvar "'+args.channel+'" resultado UNREACHABLE"')
    else:
        os.system('asterisk -rx "dialplan set chanvar "'+args.channel+'" resultado REACHABLE"')
4

I’d start with a “hello world” script to make sure that the sucker gets called at all. You generally do not need a full path and your syntax is wrong. Parameters wish to be comma separated here. Your example would only work in case the variables contain them (nor sure about the space).

5

Thanks!
I’ve created a new script and started testing line by line.
The problem is inside the function, in the return line. When I put that line, I got the error.

#!/usr/bin/python3

from api_helper import ApiHelper

from client_library import businesscalls_v1_client as client
from client_library import businesscalls_v1_messages as messages

import argparse
import os

parser = argparse.ArgumentParser()
parser.add_argument("number")
parser.add_argument("channel")
args = parser.parse_args()

print ("Hello World " + args.number + " " + args.channel)
os.system('asterisk -rx "dialplan set chanvar "'+args.channel+'" resultado HELLO"')

def check_vcall_device_reachable(device_number: str):
    request = messages.GoogleCommunicationsBusinesscallsV1CheckVcallDeviceReachableRequest()
    request.deviceNumber = device_number
    return ApiHelper().get_api_client().CheckVcallDeviceReachable(request)
    
device_reachability = check_vcall_device_reachable(args.number)

This line:
return ApiHelper().get_api_client().CheckVcallDeviceReachable(request)

Perhaps the problem is when I try to call a function outside the script?

6

Try it to check environment errors:

sudo -u asterisk -c /usr/bin/python3 /var/lib/asterisk/agi-bin/python/bv-vcall-python-command-line-examples/check_vcall_device_reachable_sample.py ${DESTINO} ${CANAL}

7

Hey everyone, I found a solution.

At first, I was trying to achieve my goal using shell script and after a lot of testing with shell, PHP and Python, I found the error, fixed and now it’s working using shell script.

I export an environment variable at the system startup and when I execute it from the terminal, it works, but since the shell script runs in a separate environment, I needed to export the variable inside the script. Now it’s working just fine.

Thanks guys

1 Like
8

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