From 4df3aa569bc8e88b70986022e558ee9024dd7ffb Mon Sep 17 00:00:00 2001 From: Lance Stout Date: Wed, 23 Feb 2011 10:09:53 -0500 Subject: Bring back the signal handlers (and the "killed" event). Now done more responsibly, saving any existing signal handlers and calling them when an interrupt occurs in addition to the one Sleek installs. NOTE: You may need to explicitly use "kill " in order to trigger the proper signal handler execution, and to raise the "killed" event. --- sleekxmpp/xmlstream/xmlstream.py | 51 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/sleekxmpp/xmlstream/xmlstream.py b/sleekxmpp/xmlstream/xmlstream.py index a5151d7b..18d891a3 100644 --- a/sleekxmpp/xmlstream/xmlstream.py +++ b/sleekxmpp/xmlstream/xmlstream.py @@ -10,6 +10,7 @@ from __future__ import with_statement, unicode_literals import copy import logging +import signal import socket as Socket import ssl import sys @@ -195,6 +196,53 @@ class XMLStream(object): self.auto_reconnect = True self.is_client = False + def use_signals(self, signals=None): + """ + Register signal handlers for SIGHUP and SIGTERM, if possible, + which will raise a "killed" event when the application is + terminated. + + If a signal handler already existed, it will be executed first, + before the "killed" event is raised. + + Arguments: + signals -- A list of signal names to be monitored. + Defaults to ['SIGHUP', 'SIGTERM']. + """ + if signals is None: + signals = ['SIGHUP', 'SIGTERM'] + + existing_handlers = {} + for sig_name in signals: + if hasattr(signal, sig_name): + sig = getattr(signal, sig_name) + handler = signal.getsignal(sig) + if handler: + existing_handlers[sig] = handler + + def handle_kill(signum, frame): + """ + Capture kill event and disconnect cleanly after first + spawning the "killed" event. + """ + + if signum in existing_handlers and \ + existing_handlers[signum] != handle_kill: + existing_handlers[signum](signum, frame) + + self.event("killed", direct=True) + self.disconnect() + + try: + for sig_name in signals: + if hasattr(signal, sig_name): + sig = getattr(signal, sig_name) + signal.signal(sig, handle_kill) + self.__signals_installed = True + except: + log.debug("Can not set interrupt signal handlers. " + \ + "SleekXMPP is not running from a main thread.") + def new_id(self): """ Generate and return a new stream ID in hexadecimal form. @@ -731,6 +779,7 @@ class XMLStream(object): if not self.stop.isSet() and self.auto_reconnect: self.reconnect() else: + self.event('killed', direct=True) self.disconnect() self.event_queue.put(('quit', None, None)) self.scheduler.run = False @@ -909,6 +958,7 @@ class XMLStream(object): return False except KeyboardInterrupt: log.debug("Keyboard Escape Detected in _event_runner") + self.event('killed', direct=True) self.disconnect() return except SystemExit: @@ -934,6 +984,7 @@ class XMLStream(object): self.disconnect(self.auto_reconnect) except KeyboardInterrupt: log.debug("Keyboard Escape Detected in _send_thread") + self.event('killed', direct=True) self.disconnect() return except SystemExit: -- cgit v1.2.3