#!/usr/bin/env python3
import json
import os
import signal
import socket
import subprocess
import sys
import websocket

ws = websocket.WebSocket()
p_list = {}

ptable = {}
ptable["audio"] = [ "/home/nginx/scripts-snowmix/working-udp-audio.sh"]
ptable["video"] = [ "/home/nginx/scripts-snowmix/working-udp-video.sh", "1", "0" ]
ptable["rtmp"] =  [ "/home/nginx/scripts-snowmix/stream.sh"]

log_list = {}
DEBUG = False

def log(s):
	if DEBUG == False:
		return
	print(s)

def conn(target):
	global ws
	if ws is None:
		ws = websocket.WebSocket()
	try:
		ws.connect(target)
	except Exception as e:
		time.sleep(2)
		conn(target) #keep trying you basterd


def close():
	if ws is None:
		return
	ws.close()

def sighandler(signal,frame):
	log("\rExiting!")
	close()
	log("Bye!")
	sys.exit(0)

def stop(key):
	if key not in p_list:
		log("key %s doesn't exist! not killing!" % (key))
		return
	try:
		os.killpg(os.getpgid(p_list[key].pid), signal.SIGTERM)
	except Exception as e:
		log("This process (%d) can't be killed! Why?" % p_list[key].pid)
		log(e)

	try:
		log_list[key].close()
	except Exception as e:
		log("ex file: %s" % e)

	if key in log_list:
		del log_list[key]

	del p_list[key]
		
def launch(key,options=None):
	if key in p_list:
		log("key %s exist! not running!" % (key))
		return
	
	if key not in ptable:
		log("This process (%s) is not on my table!" % key)
		return

	tolaunch = ptable[key]
	if options is not None:
		tolaunch = tolaunch + options

	log_list[key]=open("/tmp/%s" % key, "w")
	proc=subprocess.Popen(tolaunch, preexec_fn=os.setsid, stdout=log_list[key])
	#Le doy su propio grupo al subproceso
	p_list[key]=proc
	return proc.pid

def sendmsg(msg):
	s = socket.socket( socket.AF_INET, socket.SOCK_STREAM)
	ret = None
	try:
		s.connect(('localhost',9999))
		tosend = msg + "\r\n"
		s.sendall(tosend.encode("ascii"))
		ret=s.recv(4096)
		s.close()
	except Exception as e:
		log(e)
		return None
	log("[nc output] %s " % ret)
	return ret

ip="ws://192.168.1.208:9001"
conn(ip)
signal.signal(signal.SIGINT, sighandler)
signal.signal(signal.SIGCHLD, signal.SIG_IGN) #To kill zombies

while True:
	try:
		data = ws.recv()
	except Exception as e:
		log(e)
		conn(ip)
		continue

	try:
		j = json.loads(data)
	except Exception as e:
		log(e)
		log("Invalid json?")
		continue
	
	if ("type" not in j or "command" not in j or
		"key" not in j or j["type"] != "snowmix"):
		log("Dropping: %s" % j)
		continue

	log(j)
	if j["command"] == "launch":
		launch(j["key"]) 

	if j["command"] == "kill":
		stop(j["key"])
	
	if j["command"] == "netcat":
		sendmsg(j["key"])