#!/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()