Megatest

#!/usr/bin/env python
# -*- Mode: Python; -*- 
## Tiny Syslog Server in Python.
##
## This is a tiny syslog server that is able to receive UDP based syslog
## entries on a specified port and save them to a file.
## That's it... it does nothing else...
## There are a few configuration parameters.
 
import os
import sys, os, time, atexit
from signal import SIGTERM
import logging
import logging.handlers
import SocketServer
import datetime
from subprocess import call
import argparse

LOG_FILE = '/p/foundry/fdk-env/icfenv-logserver/icfenv_logit.log'

if os.environ['USER'] == 'bjbarcla':
  LOG_FILE = "/nfs/pdx/disks/icf_env_disk001/bjbarcla/gwa/issues/mtdev/icebin/foo.log"

PID_FILE = LOG_FILE + ".pidfile"
  
server_config = os.path.realpath(os.path.join(os.path.dirname(__file__))) + "/logserver_icfenv.conf"


import os
import socket

if os.name != "nt":
    import fcntl
    import struct

    def get_interface_ip(ifname):
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        return socket.inet_ntoa(fcntl.ioctl(s.fileno(), 0x8915, struct.pack('256s',
                                ifname[:15]))[20:24])

def get_lan_ip():
    ip = socket.gethostbyname(socket.gethostname())
    if ip.startswith("127.") and os.name != "nt":
        interfaces = [
            "eth0",
            "eth1",
            "eth2",
            "wlan0",
            "wlan1",
            "wifi0",
            "ath0",
            "ath1",
            "ppp0",
            ]
        for ifname in interfaces:
            try:
                ip = get_interface_ip(ifname)
                break
            except IOError:
                pass
    return ip

class Daemon(object):
        """
        A generic daemon class.
       
        Usage: subclass the Daemon class and override the run() method
        """
        def __init__(self, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
                self.stdin = stdin
                self.stdout = stdout
                self.stderr = stderr
                self.pidfile = pidfile
       
        def daemonize(self):
                """
                do the UNIX double-fork magic, see Stevens' "Advanced
                Programming in the UNIX Environment" for details (ISBN 0201563177)
                http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
                """
                try:
                        pid = os.fork()
                        if pid > 0:
                                # exit first parent
                                sys.exit(0)
                except OSError, e:
                        sys.stderr.write("fork #1 failed: %d (%s)\n" % (e.errno, e.strerror))
                        sys.exit(1)
       
                # decouple from parent environment
                os.chdir("/")
                os.setsid()
                os.umask(0)
       
                # do second fork
                try:
                        pid = os.fork()
                        if pid > 0:
                                # exit from second parent
                                sys.exit(0)
                except OSError, e:
                        sys.stderr.write("fork #2 failed: %d (%s)\n" % (e.errno, e.strerror))
                        sys.exit(1)
       
                # redirect standard file descriptors
                sys.stdout.flush()
                sys.stderr.flush()
                si = file(self.stdin, 'r')
                so = file(self.stdout, 'a+')
                se = file(self.stderr, 'a+', 0)
                os.dup2(si.fileno(), sys.stdin.fileno())
                os.dup2(so.fileno(), sys.stdout.fileno())
                os.dup2(se.fileno(), sys.stderr.fileno())
       
                # write pidfile
                atexit.register(self.delpid)
                pid = str(os.getpid())
                file(self.pidfile,'w+').write("%s\n" % pid)
       
        def delpid(self):
                os.remove(self.pidfile)
 
        def start(self):
                """
                Start the daemon
                """
                # Check for a pidfile to see if the daemon already runs
                try:
                        pf = file(self.pidfile,'r')
                        pid = int(pf.read().strip())
                        pf.close()
                except IOError:
                        pid = None
       
                if pid:
                        message = "pidfile %s already exist. Daemon already running?\n"
                        sys.stderr.write(message % self.pidfile)
                        sys.exit(1)
               
                # Start the daemon
                self.daemonize()
                self.run()
 
        def stop(self):
                """
                Stop the daemon
                """
                # Get the pid from the pidfile
                try:
                        pf = file(self.pidfile,'r')
                        pid = int(pf.read().strip())
                        pf.close()
                except IOError:
                        pid = None
       
                if not pid:
                        message = "pidfile %s does not exist. Daemon not running?\n"
                        sys.stderr.write(message % self.pidfile)
                        return # not an error in a restart
 
                # Try killing the daemon process       
                try:
                        while 1:
                                os.kill(pid, SIGTERM)
                                time.sleep(0.1)
                except OSError, err:
                        err = str(err)
                        if err.find("No such process") > 0:
                                if os.path.exists(self.pidfile):
                                        os.remove(self.pidfile)
                        else:
                                print str(err)
                                sys.exit(1)
 
        def restart(self):
                """
                Restart the daemon
                """
                self.stop()
                self.start()
 
        def run(self):
                """
                You should override this method when you subclass Daemon. It will be called after the process has been
                daemonized by start() or restart().
                """


def log_setup(logfile):
    log_handler = logging.handlers.WatchedFileHandler(logfile)
    formatter = logging.Formatter(
        '%(message)s','')
    #formatter.converter = time.gmtime  # if you want UTC time
    log_handler.setFormatter(formatter)
    logger = logging.getLogger()
    logger.addHandler(log_handler)
    logger.setLevel(logging.INFO)


#
# NO USER SERVICEABLE PARTS BELOW HERE...
#


class SyslogUDPHandler(SocketServer.BaseRequestHandler):
	def handle(self):
		data = bytes.decode(self.request[0].strip())
		socket = self.request[1]
		print( "%s : " % self.client_address[0], str(data))
		timestamp = datetime.datetime.now().isoformat()
		logline = timestamp + ":"+self.client_address[0] + ":" + str(data)
		logging.info(str(logline))



class TelemetryLogDaemon(Daemon):
  def __init__(self, pidfile, logfile, server_ip, server_port):
    self.logfile = logfile
    self.server_ip = server_ip
    self.server_port = server_port
    super(TelemetryLogDaemon, self).__init__(pidfile)
    
  def run(self):
    log_setup(self.logfile)
    server = SocketServer.UDPServer((self.server_ip,int(self.server_port)), SyslogUDPHandler)
    server.serve_forever(poll_interval=0.5)


def main():
  default_log_file = os.environ['PWD'] + "/telemetry.log"

  parser = argparse.ArgumentParser(description = 'telemetry-daemon')
  actions="start,restart,stop,nodaemon".split(",")
  
  parser.add_argument("-a", "--action", required=True, choices=actions, help="manage daemon: start stop or restart")
  parser.add_argument("-p", "--server-port", default="5929", help="specify alternate udp port number, default is 5929")
  parser.add_argument("-i", "--server-ip", default=get_lan_ip(), help="specify IP if heuristics to get local host lan ip fails")
  parser.add_argument("-l", "--log-file", default=default_log_file, help="specify log file to write")
  parser.add_argument("-z", "--pid-file", default=default_log_file + ".pidfile", help="specify pidfile")
  opts = parser.parse_args()

  tld = TelemetryLogDaemon(opts.pid_file, opts.log_file, opts.server_ip, opts.server_port)

  if opts.action == "start":
    print "Info: Starting server"
    print """Example addition to megatest.config to enable telemetry:

[telemetry]
host %s
port %s
want-events ALL

    """ % (opts.server_ip, opts.server_port)
    tld.start()
    
  elif opts.action == "stop":
    tld.stop()
  elif opts.action == "restart":

    print "Info: Restarting server"
    print """Example addition to megatest.config to enable telemetry:

[telemetry]
host %s
port %s
want-events ALL

    """ % (opts.server_ip, opts.server_port)
    tld.restart()
  elif opts.action == "nodaemon":
    log_setup(opts.log_file)
    server = SocketServer.UDPServer((opts.server_ip,int(opts.server_port)), SyslogUDPHandler)
    server.serve_forever(poll_interval=0.5)
  
if __name__ == '__main__':
  main()