X-Git-Url: https://git.llucax.com/software/pymin.git/blobdiff_plain/5d9d4a8e207fa5b2621f60e74eb80a46504bc855..c4a54ab88170b492e521666a9d015f345942c921:/pymin/procman.py?ds=inline diff --git a/pymin/procman.py b/pymin/procman.py index 810481d..dfa7873 100644 --- a/pymin/procman.py +++ b/pymin/procman.py @@ -4,6 +4,10 @@ import os import errno import signal import subprocess +import logging ; log = logging.getLogger('pymin.procman') + +__ALL__ = ('ProcessManager', 'manager', 'register', 'unregister', 'call', + 'start', 'stop', 'kill', 'get', 'has', 'sigchild_handler') class ProcessInfo: def __init__(self, name, command, callback=None, persist=False, @@ -23,13 +27,13 @@ class ProcessInfo: self.signal = None self.process = None self.error_count = 0 - self.last_return = None self.running = False def start(self): assert self.process is None self.restart() def restart(self): self.clear() + log.debug(u'ProcessInfo.restart(): executing %s', self.command) self.process = subprocess.Popen(self.command, *self.args, **self.kw) self.running = True def stop(self): @@ -42,8 +46,10 @@ class ProcessInfo: # Stop it self.kill(signal.SIGTERM) def kill(self, signum): + log.debug(u'ProcessInfo.kill(): killing pid %s with signal %s', + self.process.pid, signum) assert self.process is not None - os.kill(pi.process.pid, signum) + os.kill(self.process.pid, signum) self.signal = signum def __repr__(self): pid = None @@ -59,13 +65,17 @@ class ProcessManager: self.services = dict() self.namemap = dict() self.pidmap = dict() + log.debug(u'ProcessManager()') def register(self, name, command, callback=None, persist=False, *args, **kw): + log.debug(u'ProcessManager.register(%s, %s, %s, %s, %s, %s)', + name, command, callback, persist, args, kw) self.services[name] = ProcessInfo(name, command, callback, persist, args, kw) def unregister(self, name): + log.debug(u'ProcessManager.unregister(%s)', name) del self.services[name] def _call(self, pi): @@ -73,42 +83,73 @@ class ProcessManager: self.namemap[pi.name] = self.pidmap[pi.process.pid] = pi def call(self, name, command, callback=None, persist=False, *args, **kw): + log.debug(u'ProcessManager.call(%s, %s, %s, %s, %s, %s)', + name, command, callback, persist, args, kw) pi = ProcessInfo(name, command, callback, persist, args, kw) self._call(pi) def start(self, name): + log.debug(u'ProcessManager.start(%s)', name) assert name not in self.namemap self._call(self.services[name]) def stop(self, name): + log.debug(u'ProcessManager.stop(%s)', name) assert name in self.namemap - self.namemap[name].stop(name) + self.namemap[name].stop() + + def restart(self, name): + log.debug(u'ProcessManager.restart(%s)', name) + if name in self.namemap: + self.namemap[name].stop() + self.namemap[name].wait() + self.namemap[name].restart() + else: + self.namemap[name].start() def kill(self, name, signum): + log.debug(u'ProcessManager.kill(%s, %s)', name, signum) assert name in self.namemap self.namemap[name].kill(name, stop) - def sigchild_handler(self, signum): + def sigchild_handler(self, signum, stack_frame=None): + log.debug(u'ProcessManager.sigchild_handler(%s)', signum) try: (pid, status) = os.waitpid(-1, os.WNOHANG) except OSError, e: - if e.errno is e.ECHILD: + log.debug(u'ProcessManager.sigchild_handler(): OSError') + if e.errno is errno.ECHILD: + log.debug(u'ProcessManager.sigchild_handler(): OSError ECHILD') return raise + log.debug(u'ProcessManager.sigchild_handler: pid=%s, status=%s', + pid, status) while pid: if pid in self.pidmap: p = self.pidmap[pid] + p.process.returncode = status if p.callback is not None: + log.debug(u'ProcessManager.sigchild_handler: ' + u'calling %s(%s)', p.callback.__name__, p) p.callback(self, p) if p.dont_run or not p.persist or p.error_count >= p.max_errors: + log.debug(u"ProcessManager.sigchild_handler: can't " + u'persist, dont_run=%s, persist=%s, error_cout=%s, ' + u'max_errors=%s', p.dont_run, p.persist, + p.error_count, p.max_errors) del self.namemap[p.name] del self.pidmap[pid] p.clear() else: + log.debug(u'ProcessManager.sigchild_handler: persist') if p.process.returncode == 0: p.error_count = 0 + log.debug(u'ProcessManager.sigchild_handler: ' + u'return OK, resetting error_count') else: p.error_count += 1 + log.debug(u'ProcessManager.sigchild_handler: return' + u'not 0, error_count + 1 = %s', p.error_count) del self.pidmap[pid] p.restart() self.pidmap[p.process.pid] = p @@ -119,7 +160,7 @@ class ProcessManager: return raise - def __getitem__(self, name): + def get(self, name): if isinstance(name, basestring): # is a name if name in self.namemap: return self.namemap[name] @@ -128,9 +169,9 @@ class ProcessManager: else: # is a pid if name in self.pidmap: return self.pidmap[name] - return KeyError, name + raise KeyError, name - def __contains__(self, name): + def has(self, name): if isinstance(name, basestring): # is a name if name in self.namemap: return True @@ -141,6 +182,33 @@ class ProcessManager: return True return False + def __getitem__(self, name): + return self.get(name) + + def __contains__(self, name): + return self.has(name) + + +if __name__ == '__main__': + logging.basicConfig( + level = logging.DEBUG, + format = '%(asctime)s %(levelname)-8s %(message)s', + datefmt = '%H:%M:%S', + ) + + +# Globals +manager = ProcessManager() +register = manager.register +unregister = manager.unregister +call = manager.call +start = manager.start +stop = manager.stop +kill = manager.kill +get = manager.get +has = manager.has +sigchild_handler = manager.sigchild_handler + if __name__ == '__main__': @@ -150,7 +218,7 @@ if __name__ == '__main__': sig = None count = 0 - def sigchild_handler(signum, stacktrace): + def SIGCHLD_handler(signum, stacktrace): global sig sig = signum print 'SIGCHLD', signum @@ -166,21 +234,19 @@ if __name__ == '__main__': pm.start('test2') print 'died:', pi.name, pi.command - procman = ProcessManager() - - procman.register('test-service', ('sleep', '2'), notify, True) - procman.register('test2', ('sleep', '3'), notify, False) + register('test-service', ('sleep', '2'), notify, True) + register('test2', ('sleep', '3'), notify, False) - signal.signal(signal.SIGCHLD, sigchild_handler) + signal.signal(signal.SIGCHLD, SIGCHLD_handler) - procman.call('test', ('sleep', '5'), notify) - procman.start('test-service') + call('test', ('sleep', '5'), notify) + start('test-service') - print "Esperando...", [pi.name for pi in procman.namemap.values()] - while procman.pidmap: + print "Esperando...", [pi.name for pi in manager.namemap.values()] + while manager.pidmap: signal.pause() if sig == signal.SIGCHLD: + sigchild_handler(sig) sig = None - procman.sigchild_handler(sig) - print "Esperando...", [pi.name for pi in procman.namemap.values()] + print "Esperando...", [pi.name for pi in manager.namemap.values()]