echel0n
11 years ago
27 changed files with 116 additions and 404 deletions
@ -1,183 +0,0 @@ |
|||||
# Core modules |
|
||||
import atexit |
|
||||
import os |
|
||||
import sys |
|
||||
import time |
|
||||
import signal |
|
||||
|
|
||||
|
|
||||
class Daemon(object): |
|
||||
""" |
|
||||
A generic daemon class. |
|
||||
|
|
||||
Usage: subclass the Daemon class and override the run() method |
|
||||
""" |
|
||||
def __init__(self, pidfile, stdin=os.devnull, |
|
||||
stdout=os.devnull, stderr=os.devnull, |
|
||||
home_dir='.', umask=022, verbose=1): |
|
||||
self.stdin = stdin |
|
||||
self.stdout = stdout |
|
||||
self.stderr = stderr |
|
||||
self.pidfile = pidfile |
|
||||
self.home_dir = home_dir |
|
||||
self.verbose = verbose |
|
||||
self.umask = umask |
|
||||
self.daemon_alive = True |
|
||||
|
|
||||
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 |
|
||||
os._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(self.home_dir) |
|
||||
os.setsid() |
|
||||
os.umask(self.umask) |
|
||||
|
|
||||
# Do second fork |
|
||||
try: |
|
||||
pid = os.fork() |
|
||||
if pid > 0: |
|
||||
# Exit from second parent |
|
||||
os._exit(0) |
|
||||
except OSError, e: |
|
||||
sys.stderr.write( |
|
||||
"fork #2 failed: %d (%s)\n" % (e.errno, e.strerror)) |
|
||||
sys.exit(1) |
|
||||
|
|
||||
if sys.platform != 'darwin': # This block breaks on OS X |
|
||||
# Redirect standard file descriptors |
|
||||
sys.stdout.flush() |
|
||||
sys.stderr.flush() |
|
||||
si = file(self.stdin, 'r') |
|
||||
so = file(self.stdout, 'a+') |
|
||||
if self.stderr: |
|
||||
se = file(self.stderr, 'a+', 0) |
|
||||
else: |
|
||||
se = so |
|
||||
os.dup2(si.fileno(), sys.stdin.fileno()) |
|
||||
os.dup2(so.fileno(), sys.stdout.fileno()) |
|
||||
os.dup2(se.fileno(), sys.stderr.fileno()) |
|
||||
|
|
||||
if self.verbose >= 1: |
|
||||
print "Started" |
|
||||
|
|
||||
# Write pidfile |
|
||||
atexit.register( |
|
||||
self.delpid) # Make sure pid file is removed if we quit |
|
||||
pid = str(os.getpid()) |
|
||||
file(self.pidfile, 'w+').write("%s\n" % pid) |
|
||||
|
|
||||
def delpid(self): |
|
||||
os.remove(self.pidfile) |
|
||||
|
|
||||
def start(self, *args, **kwargs): |
|
||||
""" |
|
||||
Start the daemon |
|
||||
""" |
|
||||
|
|
||||
if self.verbose >= 1: |
|
||||
print "Starting..." |
|
||||
|
|
||||
# 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 |
|
||||
except SystemExit: |
|
||||
pid = None |
|
||||
|
|
||||
if pid: |
|
||||
message = "pidfile %s already exists. Is it already running?\n" |
|
||||
sys.stderr.write(message % self.pidfile) |
|
||||
sys.exit(1) |
|
||||
|
|
||||
# Start the daemon |
|
||||
self.daemonize() |
|
||||
self.run(*args, **kwargs) |
|
||||
|
|
||||
def stop(self): |
|
||||
""" |
|
||||
Stop the daemon |
|
||||
""" |
|
||||
|
|
||||
if self.verbose >= 1: |
|
||||
print "Stopping..." |
|
||||
|
|
||||
# Get the pid from the pidfile |
|
||||
pid = self.get_pid() |
|
||||
|
|
||||
if not pid: |
|
||||
message = "pidfile %s does not exist. Not running?\n" |
|
||||
sys.stderr.write(message % self.pidfile) |
|
||||
|
|
||||
# Just to be sure. A ValueError might occur if the PID file is |
|
||||
# empty but does actually exist |
|
||||
if os.path.exists(self.pidfile): |
|
||||
os.remove(self.pidfile) |
|
||||
|
|
||||
return # Not an error in a restart |
|
||||
|
|
||||
# Try killing the daemon process |
|
||||
try: |
|
||||
i = 0 |
|
||||
while 1: |
|
||||
os.kill(pid, signal.SIGTERM) |
|
||||
time.sleep(0.1) |
|
||||
i = i + 1 |
|
||||
if i % 10 == 0: |
|
||||
os.kill(pid, signal.SIGHUP) |
|
||||
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) |
|
||||
|
|
||||
if self.verbose >= 1: |
|
||||
print "Stopped" |
|
||||
|
|
||||
def restart(self): |
|
||||
""" |
|
||||
Restart the daemon |
|
||||
""" |
|
||||
self.stop() |
|
||||
self.start() |
|
||||
|
|
||||
def get_pid(self): |
|
||||
try: |
|
||||
pf = file(self.pidfile, 'r') |
|
||||
pid = int(pf.read().strip()) |
|
||||
pf.close() |
|
||||
except IOError: |
|
||||
pid = None |
|
||||
except SystemExit: |
|
||||
pid = None |
|
||||
return pid |
|
||||
|
|
||||
def is_running(self): |
|
||||
pid = self.get_pid() |
|
||||
print(pid) |
|
||||
return pid and os.path.exists('/proc/%d' % pid) |
|
||||
|
|
||||
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(). |
|
||||
""" |
|
||||
Loading…
Reference in new issue