astpicotts/helpers.py

#!/usr/bin/env python2

import re
import subprocess
import logging
import time

def get_path(soft):
	try:
		path = subprocess.check_output(['which', soft]).strip()
		return path
	except subprocess.CalledProcessError, e:
		logging.fatal('%s not found' % soft)
		return False

def get_sox_ver(sox_path=None):
	global sox_ver
	if 'sox_ver' not in globals() or not sox_ver:
		if not sox_path:
			sox_path = get_path('sox')
		try:
			result = subprocess.check_output([sox_path, '--version'])
			logging.debug('Sox accept --version parameter : consider as version 14')
			sox_ver = 14
		except subprocess.CalledProcessError:
			logging.debug('Sox not accept --version parameter : consider as version 12')
			sox_ver = 12
	return sox_ver

def enable_simulate_mode():
	global SIMULATE_MODE
	SIMULATE_MODE = True

def check_simulate_mode():
	return 'SIMULATE_MODE' in globals() and SIMULATE_MODE

def get_var(asterisk_agi, varname):
	if check_simulate_mode():
		result = raw_input('Simulate mode : please enter "%s" variable value =>> ' % varname)
	else:
		result = asterisk_agi.get_full_variable(varname)
	return result

def set_var(asterisk_agi, varname, value):
	if check_simulate_mode():
		print('Simulate mode : set variable %s to "%s"' % (varname, value))
	else:
		logging.info('Set variable %s to "%s"' % (varname, value))
		asterisk_agi.set_variable(varname, value)

def detect_format(asterisk_agi):
	if check_simulate_mode():
		return ("sln", 8000)
	nativeformat = asterisk_agi.get_full_variable('${CHANNEL(audionativeformat)}')
	logging.debug('Native audio format : %s' % nativeformat)
	if re.match('(silk|sln)12', nativeformat):
		return ("sln12", 12000)
	elif re.match('(speex|slin|silk)16|g722|siren7', nativeformat):
		return ("sln16", 16000)
	elif re.match('(speex|slin|celt)32|siren14', nativeformat):
		return ("sln32", 32000)
	elif re.match('(celt|slin)44', nativeformat):
		return ("sln44", 44100)
	elif re.match('(celt|slin)48', nativeformat):
		return ("sln48", 48000)
	else:
		return ("sln", 8000)

def remove_ext(filepath):
	return re.sub('\.[a-zA-Z0-9]+$','',filepath)

any_intkeys = "0123456789#*"
def playback(asterisk_agi, filepath, simulate_play=False, read=False, read_timeout=3000, read_maxdigits=20, intkey=None):
	if check_simulate_mode():
		logging.debug('Simulate mode : Play file %s' % filepath)
		try:
			mplayer_path = get_path('mplayer')
			subprocess.check_output([mplayer_path, filepath])
		except Exception, e:
			logging.warning('Fail to play %s file : %s' % (filepath, e))
		if read:
			result = raw_input('=>> ')
		else:
			# Simulate empty result
			result = ''
	else:
		play_filepath = remove_ext(filepath)
		logging.debug('Asterisk play file path : %s' % play_filepath)
		if read:
			result = asterisk_agi.get_data(play_filepath, timeout=read_timeout, max_digits=read_maxdigits)
		else:
			if intkey == "any":
				global any_intkeys
				intkey = any_intkeys
			result = asterisk_agi.stream_file(play_filepath, escape_digits=intkey)
		logging.debug('User enter "%s"' % result)
	return result

def check_answered(asterisk_agi):
	if check_simulate_mode():
		print('Simulate mode : Channel answered')
	else:
		status = asterisk_agi.channel_status()
		if status == 4:
			logging.debug('Call is riging. Answer it and wait one second.')
			asterisk_agi.answer()
			time.sleep(1)

def hangup(asterisk_agi):
	if check_simulate_mode():
		print('Simulate mode : Hangup')
	else:
		asterisk_agi.hangup()