diff options
Diffstat (limited to 'cherrypy/process')
| -rwxr-xr-x | cherrypy/process/__init__.py | 14 | ||||
| -rwxr-xr-x | cherrypy/process/plugins.py | 681 | ||||
| -rwxr-xr-x | cherrypy/process/servers.py | 418 | ||||
| -rwxr-xr-x | cherrypy/process/win32.py | 174 | ||||
| -rwxr-xr-x | cherrypy/process/wspbus.py | 393 |
5 files changed, 0 insertions, 1680 deletions
diff --git a/cherrypy/process/__init__.py b/cherrypy/process/__init__.py deleted file mode 100755 index f15b123..0000000 --- a/cherrypy/process/__init__.py +++ /dev/null @@ -1,14 +0,0 @@ -"""Site container for an HTTP server. - -A Web Site Process Bus object is used to connect applications, servers, -and frameworks with site-wide services such as daemonization, process -reload, signal handling, drop privileges, PID file management, logging -for all of these, and many more. - -The 'plugins' module defines a few abstract and concrete services for -use with the bus. Some use tool-specific channels; see the documentation -for each class. -""" - -from cherrypy.process.wspbus import bus -from cherrypy.process import plugins, servers diff --git a/cherrypy/process/plugins.py b/cherrypy/process/plugins.py deleted file mode 100755 index 488958e..0000000 --- a/cherrypy/process/plugins.py +++ /dev/null @@ -1,681 +0,0 @@ -"""Site services for use with a Web Site Process Bus.""" - -import os -import re -import signal as _signal -import sys -import time -import threading - -from cherrypy._cpcompat import basestring, get_daemon, get_thread_ident, ntob, set - -# _module__file__base is used by Autoreload to make -# absolute any filenames retrieved from sys.modules which are not -# already absolute paths. This is to work around Python's quirk -# of importing the startup script and using a relative filename -# for it in sys.modules. -# -# Autoreload examines sys.modules afresh every time it runs. If an application -# changes the current directory by executing os.chdir(), then the next time -# Autoreload runs, it will not be able to find any filenames which are -# not absolute paths, because the current directory is not the same as when the -# module was first imported. Autoreload will then wrongly conclude the file has -# "changed", and initiate the shutdown/re-exec sequence. -# See ticket #917. -# For this workaround to have a decent probability of success, this module -# needs to be imported as early as possible, before the app has much chance -# to change the working directory. -_module__file__base = os.getcwd() - - -class SimplePlugin(object): - """Plugin base class which auto-subscribes methods for known channels.""" - - bus = None - """A :class:`Bus <cherrypy.process.wspbus.Bus>`, usually cherrypy.engine.""" - - def __init__(self, bus): - self.bus = bus - - def subscribe(self): - """Register this object as a (multi-channel) listener on the bus.""" - for channel in self.bus.listeners: - # Subscribe self.start, self.exit, etc. if present. - method = getattr(self, channel, None) - if method is not None: - self.bus.subscribe(channel, method) - - def unsubscribe(self): - """Unregister this object as a listener on the bus.""" - for channel in self.bus.listeners: - # Unsubscribe self.start, self.exit, etc. if present. - method = getattr(self, channel, None) - if method is not None: - self.bus.unsubscribe(channel, method) - - - -class SignalHandler(object): - """Register bus channels (and listeners) for system signals. - - You can modify what signals your application listens for, and what it does - when it receives signals, by modifying :attr:`SignalHandler.handlers`, - a dict of {signal name: callback} pairs. The default set is:: - - handlers = {'SIGTERM': self.bus.exit, - 'SIGHUP': self.handle_SIGHUP, - 'SIGUSR1': self.bus.graceful, - } - - The :func:`SignalHandler.handle_SIGHUP`` method calls - :func:`bus.restart()<cherrypy.process.wspbus.Bus.restart>` - if the process is daemonized, but - :func:`bus.exit()<cherrypy.process.wspbus.Bus.exit>` - if the process is attached to a TTY. This is because Unix window - managers tend to send SIGHUP to terminal windows when the user closes them. - - Feel free to add signals which are not available on every platform. The - :class:`SignalHandler` will ignore errors raised from attempting to register - handlers for unknown signals. - """ - - handlers = {} - """A map from signal names (e.g. 'SIGTERM') to handlers (e.g. bus.exit).""" - - signals = {} - """A map from signal numbers to names.""" - - for k, v in vars(_signal).items(): - if k.startswith('SIG') and not k.startswith('SIG_'): - signals[v] = k - del k, v - - def __init__(self, bus): - self.bus = bus - # Set default handlers - self.handlers = {'SIGTERM': self.bus.exit, - 'SIGHUP': self.handle_SIGHUP, - 'SIGUSR1': self.bus.graceful, - } - - if sys.platform[:4] == 'java': - del self.handlers['SIGUSR1'] - self.handlers['SIGUSR2'] = self.bus.graceful - self.bus.log("SIGUSR1 cannot be set on the JVM platform. " - "Using SIGUSR2 instead.") - self.handlers['SIGINT'] = self._jython_SIGINT_handler - - self._previous_handlers = {} - - def _jython_SIGINT_handler(self, signum=None, frame=None): - # See http://bugs.jython.org/issue1313 - self.bus.log('Keyboard Interrupt: shutting down bus') - self.bus.exit() - - def subscribe(self): - """Subscribe self.handlers to signals.""" - for sig, func in self.handlers.items(): - try: - self.set_handler(sig, func) - except ValueError: - pass - - def unsubscribe(self): - """Unsubscribe self.handlers from signals.""" - for signum, handler in self._previous_handlers.items(): - signame = self.signals[signum] - - if handler is None: - self.bus.log("Restoring %s handler to SIG_DFL." % signame) - handler = _signal.SIG_DFL - else: - self.bus.log("Restoring %s handler %r." % (signame, handler)) - - try: - our_handler = _signal.signal(signum, handler) - if our_handler is None: - self.bus.log("Restored old %s handler %r, but our " - "handler was not registered." % - (signame, handler), level=30) - except ValueError: - self.bus.log("Unable to restore %s handler %r." % - (signame, handler), level=40, traceback=True) - - def set_handler(self, signal, listener=None): - """Subscribe a handler for the given signal (number or name). - - If the optional 'listener' argument is provided, it will be - subscribed as a listener for the given signal's channel. - - If the given signal name or number is not available on the current - platform, ValueError is raised. - """ - if isinstance(signal, basestring): - signum = getattr(_signal, signal, None) - if signum is None: - raise ValueError("No such signal: %r" % signal) - signame = signal - else: - try: - signame = self.signals[signal] - except KeyError: - raise ValueError("No such signal: %r" % signal) - signum = signal - - prev = _signal.signal(signum, self._handle_signal) - self._previous_handlers[signum] = prev - - if listener is not None: - self.bus.log("Listening for %s." % signame) - self.bus.subscribe(signame, listener) - - def _handle_signal(self, signum=None, frame=None): - """Python signal handler (self.set_handler subscribes it for you).""" - signame = self.signals[signum] - self.bus.log("Caught signal %s." % signame) - self.bus.publish(signame) - - def handle_SIGHUP(self): - """Restart if daemonized, else exit.""" - if os.isatty(sys.stdin.fileno()): - # not daemonized (may be foreground or background) - self.bus.log("SIGHUP caught but not daemonized. Exiting.") - self.bus.exit() - else: - self.bus.log("SIGHUP caught while daemonized. Restarting.") - self.bus.restart() - - -try: - import pwd, grp -except ImportError: - pwd, grp = None, None - - -class DropPrivileges(SimplePlugin): - """Drop privileges. uid/gid arguments not available on Windows. - - Special thanks to Gavin Baker: http://antonym.org/node/100. - """ - - def __init__(self, bus, umask=None, uid=None, gid=None): - SimplePlugin.__init__(self, bus) - self.finalized = False - self.uid = uid - self.gid = gid - self.umask = umask - - def _get_uid(self): - return self._uid - def _set_uid(self, val): - if val is not None: - if pwd is None: - self.bus.log("pwd module not available; ignoring uid.", - level=30) - val = None - elif isinstance(val, basestring): - val = pwd.getpwnam(val)[2] - self._uid = val - uid = property(_get_uid, _set_uid, - doc="The uid under which to run. Availability: Unix.") - - def _get_gid(self): - return self._gid - def _set_gid(self, val): - if val is not None: - if grp is None: - self.bus.log("grp module not available; ignoring gid.", - level=30) - val = None - elif isinstance(val, basestring): - val = grp.getgrnam(val)[2] - self._gid = val - gid = property(_get_gid, _set_gid, - doc="The gid under which to run. Availability: Unix.") - - def _get_umask(self): - return self._umask - def _set_umask(self, val): - if val is not None: - try: - os.umask - except AttributeError: - self.bus.log("umask function not available; ignoring umask.", - level=30) - val = None - self._umask = val - umask = property(_get_umask, _set_umask, - doc="""The default permission mode for newly created files and directories. - - Usually expressed in octal format, for example, ``0644``. - Availability: Unix, Windows. - """) - - def start(self): - # uid/gid - def current_ids(): - """Return the current (uid, gid) if available.""" - name, group = None, None - if pwd: - name = pwd.getpwuid(os.getuid())[0] - if grp: - group = grp.getgrgid(os.getgid())[0] - return name, group - - if self.finalized: - if not (self.uid is None and self.gid is None): - self.bus.log('Already running as uid: %r gid: %r' % - current_ids()) - else: - if self.uid is None and self.gid is None: - if pwd or grp: - self.bus.log('uid/gid not set', level=30) - else: - self.bus.log('Started as uid: %r gid: %r' % current_ids()) - if self.gid is not None: - os.setgid(self.gid) - os.setgroups([]) - if self.uid is not None: - os.setuid(self.uid) - self.bus.log('Running as uid: %r gid: %r' % current_ids()) - - # umask - if self.finalized: - if self.umask is not None: - self.bus.log('umask already set to: %03o' % self.umask) - else: - if self.umask is None: - self.bus.log('umask not set', level=30) - else: - old_umask = os.umask(self.umask) - self.bus.log('umask old: %03o, new: %03o' % - (old_umask, self.umask)) - - self.finalized = True - # This is slightly higher than the priority for server.start - # in order to facilitate the most common use: starting on a low - # port (which requires root) and then dropping to another user. - start.priority = 77 - - -class Daemonizer(SimplePlugin): - """Daemonize the running script. - - Use this with a Web Site Process Bus via:: - - Daemonizer(bus).subscribe() - - When this component finishes, the process is completely decoupled from - the parent environment. Please note that when this component is used, - the return code from the parent process will still be 0 if a startup - error occurs in the forked children. Errors in the initial daemonizing - process still return proper exit codes. Therefore, if you use this - plugin to daemonize, don't use the return code as an accurate indicator - of whether the process fully started. In fact, that return code only - indicates if the process succesfully finished the first fork. - """ - - def __init__(self, bus, stdin='/dev/null', stdout='/dev/null', - stderr='/dev/null'): - SimplePlugin.__init__(self, bus) - self.stdin = stdin - self.stdout = stdout - self.stderr = stderr - self.finalized = False - - def start(self): - if self.finalized: - self.bus.log('Already deamonized.') - - # forking has issues with threads: - # http://www.opengroup.org/onlinepubs/000095399/functions/fork.html - # "The general problem with making fork() work in a multi-threaded - # world is what to do with all of the threads..." - # So we check for active threads: - if threading.activeCount() != 1: - self.bus.log('There are %r active threads. ' - 'Daemonizing now may cause strange failures.' % - threading.enumerate(), level=30) - - # See http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16 - # (or http://www.faqs.org/faqs/unix-faq/programmer/faq/ section 1.7) - # and http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66012 - - # Finish up with the current stdout/stderr - sys.stdout.flush() - sys.stderr.flush() - - # Do first fork. - try: - pid = os.fork() - if pid == 0: - # This is the child process. Continue. - pass - else: - # This is the first parent. Exit, now that we've forked. - self.bus.log('Forking once.') - os._exit(0) - except OSError: - # Python raises OSError rather than returning negative numbers. - exc = sys.exc_info()[1] - sys.exit("%s: fork #1 failed: (%d) %s\n" - % (sys.argv[0], exc.errno, exc.strerror)) - - os.setsid() - - # Do second fork - try: - pid = os.fork() - if pid > 0: - self.bus.log('Forking twice.') - os._exit(0) # Exit second parent - except OSError: - exc = sys.exc_info()[1] - sys.exit("%s: fork #2 failed: (%d) %s\n" - % (sys.argv[0], exc.errno, exc.strerror)) - - os.chdir("/") - os.umask(0) - - si = open(self.stdin, "r") - so = open(self.stdout, "a+") - se = open(self.stderr, "a+") - - # os.dup2(fd, fd2) will close fd2 if necessary, - # so we don't explicitly close stdin/out/err. - # See http://docs.python.org/lib/os-fd-ops.html - os.dup2(si.fileno(), sys.stdin.fileno()) - os.dup2(so.fileno(), sys.stdout.fileno()) - os.dup2(se.fileno(), sys.stderr.fileno()) - - self.bus.log('Daemonized to PID: %s' % os.getpid()) - self.finalized = True - start.priority = 65 - - -class PIDFile(SimplePlugin): - """Maintain a PID file via a WSPBus.""" - - def __init__(self, bus, pidfile): - SimplePlugin.__init__(self, bus) - self.pidfile = pidfile - self.finalized = False - - def start(self): - pid = os.getpid() - if self.finalized: - self.bus.log('PID %r already written to %r.' % (pid, self.pidfile)) - else: - open(self.pidfile, "wb").write(ntob("%s" % pid, 'utf8')) - self.bus.log('PID %r written to %r.' % (pid, self.pidfile)) - self.finalized = True - start.priority = 70 - - def exit(self): - try: - os.remove(self.pidfile) - self.bus.log('PID file removed: %r.' % self.pidfile) - except (KeyboardInterrupt, SystemExit): - raise - except: - pass - - -class PerpetualTimer(threading._Timer): - """A responsive subclass of threading._Timer whose run() method repeats. - - Use this timer only when you really need a very interruptible timer; - this checks its 'finished' condition up to 20 times a second, which can - results in pretty high CPU usage - """ - - def run(self): - while True: - self.finished.wait(self.interval) - if self.finished.isSet(): - return - try: - self.function(*self.args, **self.kwargs) - except Exception: - self.bus.log("Error in perpetual timer thread function %r." % - self.function, level=40, traceback=True) - # Quit on first error to avoid massive logs. - raise - - -class BackgroundTask(threading.Thread): - """A subclass of threading.Thread whose run() method repeats. - - Use this class for most repeating tasks. It uses time.sleep() to wait - for each interval, which isn't very responsive; that is, even if you call - self.cancel(), you'll have to wait until the sleep() call finishes before - the thread stops. To compensate, it defaults to being daemonic, which means - it won't delay stopping the whole process. - """ - - def __init__(self, interval, function, args=[], kwargs={}): - threading.Thread.__init__(self) - self.interval = interval - self.function = function - self.args = args - self.kwargs = kwargs - self.running = False - - def cancel(self): - self.running = False - - def run(self): - self.running = True - while self.running: - time.sleep(self.interval) - if not self.running: - return - try: - self.function(*self.args, **self.kwargs) - except Exception: - self.bus.log("Error in background task thread function %r." % - self.function, level=40, traceback=True) - # Quit on first error to avoid massive logs. - raise - - def _set_daemon(self): - return True - - -class Monitor(SimplePlugin): - """WSPBus listener to periodically run a callback in its own thread.""" - - callback = None - """The function to call at intervals.""" - - frequency = 60 - """The time in seconds between callback runs.""" - - thread = None - """A :class:`BackgroundTask<cherrypy.process.plugins.BackgroundTask>` thread.""" - - def __init__(self, bus, callback, frequency=60, name=None): - SimplePlugin.__init__(self, bus) - self.callback = callback - self.frequency = frequency - self.thread = None - self.name = name - - def start(self): - """Start our callback in its own background thread.""" - if self.frequency > 0: - threadname = self.name or self.__class__.__name__ - if self.thread is None: - self.thread = BackgroundTask(self.frequency, self.callback) - self.thread.bus = self.bus - self.thread.setName(threadname) - self.thread.start() - self.bus.log("Started monitor thread %r." % threadname) - else: - self.bus.log("Monitor thread %r already started." % threadname) - start.priority = 70 - - def stop(self): - """Stop our callback's background task thread.""" - if self.thread is None: - self.bus.log("No thread running for %s." % self.name or self.__class__.__name__) - else: - if self.thread is not threading.currentThread(): - name = self.thread.getName() - self.thread.cancel() - if not get_daemon(self.thread): - self.bus.log("Joining %r" % name) - self.thread.join() - self.bus.log("Stopped thread %r." % name) - self.thread = None - - def graceful(self): - """Stop the callback's background task thread and restart it.""" - self.stop() - self.start() - - -class Autoreloader(Monitor): - """Monitor which re-executes the process when files change. - - This :ref:`plugin<plugins>` restarts the process (via :func:`os.execv`) - if any of the files it monitors change (or is deleted). By default, the - autoreloader monitors all imported modules; you can add to the - set by adding to ``autoreload.files``:: - - cherrypy.engine.autoreload.files.add(myFile) - - If there are imported files you do *not* wish to monitor, you can adjust the - ``match`` attribute, a regular expression. For example, to stop monitoring - cherrypy itself:: - - cherrypy.engine.autoreload.match = r'^(?!cherrypy).+' - - Like all :class:`Monitor<cherrypy.process.plugins.Monitor>` plugins, - the autoreload plugin takes a ``frequency`` argument. The default is - 1 second; that is, the autoreloader will examine files once each second. - """ - - files = None - """The set of files to poll for modifications.""" - - frequency = 1 - """The interval in seconds at which to poll for modified files.""" - - match = '.*' - """A regular expression by which to match filenames.""" - - def __init__(self, bus, frequency=1, match='.*'): - self.mtimes = {} - self.files = set() - self.match = match - Monitor.__init__(self, bus, self.run, frequency) - - def start(self): - """Start our own background task thread for self.run.""" - if self.thread is None: - self.mtimes = {} - Monitor.start(self) - start.priority = 70 - - def sysfiles(self): - """Return a Set of sys.modules filenames to monitor.""" - files = set() - for k, m in sys.modules.items(): - if re.match(self.match, k): - if hasattr(m, '__loader__') and hasattr(m.__loader__, 'archive'): - f = m.__loader__.archive - else: - f = getattr(m, '__file__', None) - if f is not None and not os.path.isabs(f): - # ensure absolute paths so a os.chdir() in the app doesn't break me - f = os.path.normpath(os.path.join(_module__file__base, f)) - files.add(f) - return files - - def run(self): - """Reload the process if registered files have been modified.""" - for filename in self.sysfiles() | self.files: - if filename: - if filename.endswith('.pyc'): - filename = filename[:-1] - - oldtime = self.mtimes.get(filename, 0) - if oldtime is None: - # Module with no .py file. Skip it. - continue - - try: - mtime = os.stat(filename).st_mtime - except OSError: - # Either a module with no .py file, or it's been deleted. - mtime = None - - if filename not in self.mtimes: - # If a module has no .py file, this will be None. - self.mtimes[filename] = mtime - else: - if mtime is None or mtime > oldtime: - # The file has been deleted or modified. - self.bus.log("Restarting because %s changed." % filename) - self.thread.cancel() - self.bus.log("Stopped thread %r." % self.thread.getName()) - self.bus.restart() - return - - -class ThreadManager(SimplePlugin): - """Manager for HTTP request threads. - - If you have control over thread creation and destruction, publish to - the 'acquire_thread' and 'release_thread' channels (for each thread). - This will register/unregister the current thread and publish to - 'start_thread' and 'stop_thread' listeners in the bus as needed. - - If threads are created and destroyed by code you do not control - (e.g., Apache), then, at the beginning of every HTTP request, - publish to 'acquire_thread' only. You should not publish to - 'release_thread' in this case, since you do not know whether - the thread will be re-used or not. The bus will call - 'stop_thread' listeners for you when it stops. - """ - - threads = None - """A map of {thread ident: index number} pairs.""" - - def __init__(self, bus): - self.threads = {} - SimplePlugin.__init__(self, bus) - self.bus.listeners.setdefault('acquire_thread', set()) - self.bus.listeners.setdefault('start_thread', set()) - self.bus.listeners.setdefault('release_thread', set()) - self.bus.listeners.setdefault('stop_thread', set()) - - def acquire_thread(self): - """Run 'start_thread' listeners for the current thread. - - If the current thread has already been seen, any 'start_thread' - listeners will not be run again. - """ - thread_ident = get_thread_ident() - if thread_ident not in self.threads: - # We can't just use get_ident as the thread ID - # because some platforms reuse thread ID's. - i = len(self.threads) + 1 - self.threads[thread_ident] = i - self.bus.publish('start_thread', i) - - def release_thread(self): - """Release the current thread and run 'stop_thread' listeners.""" - thread_ident = get_thread_ident() - i = self.threads.pop(thread_ident, None) - if i is not None: - self.bus.publish('stop_thread', i) - - def stop(self): - """Release all threads and run all 'stop_thread' listeners.""" - for thread_ident, i in self.threads.items(): - self.bus.publish('stop_thread', i) - self.threads.clear() - graceful = stop - diff --git a/cherrypy/process/servers.py b/cherrypy/process/servers.py deleted file mode 100755 index 272e843..0000000 --- a/cherrypy/process/servers.py +++ /dev/null @@ -1,418 +0,0 @@ -""" -Starting in CherryPy 3.1, cherrypy.server is implemented as an -:ref:`Engine Plugin<plugins>`. It's an instance of -:class:`cherrypy._cpserver.Server`, which is a subclass of -:class:`cherrypy.process.servers.ServerAdapter`. The ``ServerAdapter`` class -is designed to control other servers, as well. - -Multiple servers/ports -====================== - -If you need to start more than one HTTP server (to serve on multiple ports, or -protocols, etc.), you can manually register each one and then start them all -with engine.start:: - - s1 = ServerAdapter(cherrypy.engine, MyWSGIServer(host='0.0.0.0', port=80)) - s2 = ServerAdapter(cherrypy.engine, another.HTTPServer(host='127.0.0.1', SSL=True)) - s1.subscribe() - s2.subscribe() - cherrypy.engine.start() - -.. index:: SCGI - -FastCGI/SCGI -============ - -There are also Flup\ **F**\ CGIServer and Flup\ **S**\ CGIServer classes in -:mod:`cherrypy.process.servers`. To start an fcgi server, for example, -wrap an instance of it in a ServerAdapter:: - - addr = ('0.0.0.0', 4000) - f = servers.FlupFCGIServer(application=cherrypy.tree, bindAddress=addr) - s = servers.ServerAdapter(cherrypy.engine, httpserver=f, bind_addr=addr) - s.subscribe() - -The :doc:`cherryd</deployguide/cherryd>` startup script will do the above for -you via its `-f` flag. -Note that you need to download and install `flup <http://trac.saddi.com/flup>`_ -yourself, whether you use ``cherryd`` or not. - -.. _fastcgi: -.. index:: FastCGI - -FastCGI -------- - -A very simple setup lets your cherry run with FastCGI. -You just need the flup library, -plus a running Apache server (with ``mod_fastcgi``) or lighttpd server. - -CherryPy code -^^^^^^^^^^^^^ - -hello.py:: - - #!/usr/bin/python - import cherrypy - - class HelloWorld: - \"""Sample request handler class.\""" - def index(self): - return "Hello world!" - index.exposed = True - - cherrypy.tree.mount(HelloWorld()) - # CherryPy autoreload must be disabled for the flup server to work - cherrypy.config.update({'engine.autoreload_on':False}) - -Then run :doc:`/deployguide/cherryd` with the '-f' arg:: - - cherryd -c <myconfig> -d -f -i hello.py - -Apache -^^^^^^ - -At the top level in httpd.conf:: - - FastCgiIpcDir /tmp - FastCgiServer /path/to/cherry.fcgi -idle-timeout 120 -processes 4 - -And inside the relevant VirtualHost section:: - - # FastCGI config - AddHandler fastcgi-script .fcgi - ScriptAliasMatch (.*$) /path/to/cherry.fcgi$1 - -Lighttpd -^^^^^^^^ - -For `Lighttpd <http://www.lighttpd.net/>`_ you can follow these -instructions. Within ``lighttpd.conf`` make sure ``mod_fastcgi`` is -active within ``server.modules``. Then, within your ``$HTTP["host"]`` -directive, configure your fastcgi script like the following:: - - $HTTP["url"] =~ "" { - fastcgi.server = ( - "/" => ( - "script.fcgi" => ( - "bin-path" => "/path/to/your/script.fcgi", - "socket" => "/tmp/script.sock", - "check-local" => "disable", - "disable-time" => 1, - "min-procs" => 1, - "max-procs" => 1, # adjust as needed - ), - ), - ) - } # end of $HTTP["url"] =~ "^/" - -Please see `Lighttpd FastCGI Docs -<http://redmine.lighttpd.net/wiki/lighttpd/Docs:ModFastCGI>`_ for an explanation -of the possible configuration options. -""" - -import sys -import time - - -class ServerAdapter(object): - """Adapter for an HTTP server. - - If you need to start more than one HTTP server (to serve on multiple - ports, or protocols, etc.), you can manually register each one and then - start them all with bus.start: - - s1 = ServerAdapter(bus, MyWSGIServer(host='0.0.0.0', port=80)) - s2 = ServerAdapter(bus, another.HTTPServer(host='127.0.0.1', SSL=True)) - s1.subscribe() - s2.subscribe() - bus.start() - """ - - def __init__(self, bus, httpserver=None, bind_addr=None): - self.bus = bus - self.httpserver = httpserver - self.bind_addr = bind_addr - self.interrupt = None - self.running = False - - def subscribe(self): - self.bus.subscribe('start', self.start) - self.bus.subscribe('stop', self.stop) - - def unsubscribe(self): - self.bus.unsubscribe('start', self.start) - self.bus.unsubscribe('stop', self.stop) - - def start(self): - """Start the HTTP server.""" - if self.bind_addr is None: - on_what = "unknown interface (dynamic?)" - elif isinstance(self.bind_addr, tuple): - host, port = self.bind_addr - on_what = "%s:%s" % (host, port) - else: - on_what = "socket file: %s" % self.bind_addr - - if self.running: - self.bus.log("Already serving on %s" % on_what) - return - - self.interrupt = None - if not self.httpserver: - raise ValueError("No HTTP server has been created.") - - # Start the httpserver in a new thread. - if isinstance(self.bind_addr, tuple): - wait_for_free_port(*self.bind_addr) - - import threading - t = threading.Thread(target=self._start_http_thread) - t.setName("HTTPServer " + t.getName()) - t.start() - - self.wait() - self.running = True - self.bus.log("Serving on %s" % on_what) - start.priority = 75 - - def _start_http_thread(self): - """HTTP servers MUST be running in new threads, so that the - main thread persists to receive KeyboardInterrupt's. If an - exception is raised in the httpserver's thread then it's - trapped here, and the bus (and therefore our httpserver) - are shut down. - """ - try: - self.httpserver.start() - except KeyboardInterrupt: - self.bus.log("<Ctrl-C> hit: shutting down HTTP server") - self.interrupt = sys.exc_info()[1] - self.bus.exit() - except SystemExit: - self.bus.log("SystemExit raised: shutting down HTTP server") - self.interrupt = sys.exc_info()[1] - self.bus.exit() - raise - except: - self.interrupt = sys.exc_info()[1] - self.bus.log("Error in HTTP server: shutting down", - traceback=True, level=40) - self.bus.exit() - raise - - def wait(self): - """Wait until the HTTP server is ready to receive requests.""" - while not getattr(self.httpserver, "ready", False): - if self.interrupt: - raise self.interrupt - time.sleep(.1) - - # Wait for port to be occupied - if isinstance(self.bind_addr, tuple): - host, port = self.bind_addr - wait_for_occupied_port(host, port) - - def stop(self): - """Stop the HTTP server.""" - if self.running: - # stop() MUST block until the server is *truly* stopped. - self.httpserver.stop() - # Wait for the socket to be truly freed. - if isinstance(self.bind_addr, tuple): - wait_for_free_port(*self.bind_addr) - self.running = False - self.bus.log("HTTP Server %s shut down" % self.httpserver) - else: - self.bus.log("HTTP Server %s already shut down" % self.httpserver) - stop.priority = 25 - - def restart(self): - """Restart the HTTP server.""" - self.stop() - self.start() - - -class FlupCGIServer(object): - """Adapter for a flup.server.cgi.WSGIServer.""" - - def __init__(self, *args, **kwargs): - self.args = args - self.kwargs = kwargs - self.ready = False - - def start(self): - """Start the CGI server.""" - # We have to instantiate the server class here because its __init__ - # starts a threadpool. If we do it too early, daemonize won't work. - from flup.server.cgi import WSGIServer - - self.cgiserver = WSGIServer(*self.args, **self.kwargs) - self.ready = True - self.cgiserver.run() - - def stop(self): - """Stop the HTTP server.""" - self.ready = False - - -class FlupFCGIServer(object): - """Adapter for a flup.server.fcgi.WSGIServer.""" - - def __init__(self, *args, **kwargs): - if kwargs.get('bindAddress', None) is None: - import socket - if not hasattr(socket, 'fromfd'): - raise ValueError( - 'Dynamic FCGI server not available on this platform. ' - 'You must use a static or external one by providing a ' - 'legal bindAddress.') - self.args = args - self.kwargs = kwargs - self.ready = False - - def start(self): - """Start the FCGI server.""" - # We have to instantiate the server class here because its __init__ - # starts a threadpool. If we do it too early, daemonize won't work. - from flup.server.fcgi import WSGIServer - self.fcgiserver = WSGIServer(*self.args, **self.kwargs) - # TODO: report this bug upstream to flup. - # If we don't set _oldSIGs on Windows, we get: - # File "C:\Python24\Lib\site-packages\flup\server\threadedserver.py", - # line 108, in run - # self._restoreSignalHandlers() - # File "C:\Python24\Lib\site-packages\flup\server\threadedserver.py", - # line 156, in _restoreSignalHandlers - # for signum,handler in self._oldSIGs: - # AttributeError: 'WSGIServer' object has no attribute '_oldSIGs' - self.fcgiserver._installSignalHandlers = lambda: None - self.fcgiserver._oldSIGs = [] - self.ready = True - self.fcgiserver.run() - - def stop(self): - """Stop the HTTP server.""" - # Forcibly stop the fcgi server main event loop. - self.fcgiserver._keepGoing = False - # Force all worker threads to die off. - self.fcgiserver._threadPool.maxSpare = self.fcgiserver._threadPool._idleCount - self.ready = False - - -class FlupSCGIServer(object): - """Adapter for a flup.server.scgi.WSGIServer.""" - - def __init__(self, *args, **kwargs): - self.args = args - self.kwargs = kwargs - self.ready = False - - def start(self): - """Start the SCGI server.""" - # We have to instantiate the server class here because its __init__ - # starts a threadpool. If we do it too early, daemonize won't work. - from flup.server.scgi import WSGIServer - self.scgiserver = WSGIServer(*self.args, **self.kwargs) - # TODO: report this bug upstream to flup. - # If we don't set _oldSIGs on Windows, we get: - # File "C:\Python24\Lib\site-packages\flup\server\threadedserver.py", - # line 108, in run - # self._restoreSignalHandlers() - # File "C:\Python24\Lib\site-packages\flup\server\threadedserver.py", - # line 156, in _restoreSignalHandlers - # for signum,handler in self._oldSIGs: - # AttributeError: 'WSGIServer' object has no attribute '_oldSIGs' - self.scgiserver._installSignalHandlers = lambda: None - self.scgiserver._oldSIGs = [] - self.ready = True - self.scgiserver.run() - - def stop(self): - """Stop the HTTP server.""" - self.ready = False - # Forcibly stop the scgi server main event loop. - self.scgiserver._keepGoing = False - # Force all worker threads to die off. - self.scgiserver._threadPool.maxSpare = 0 - - -def client_host(server_host): - """Return the host on which a client can connect to the given listener.""" - if server_host == '0.0.0.0': - # 0.0.0.0 is INADDR_ANY, which should answer on localhost. - return '127.0.0.1' - if server_host in ('::', '::0', '::0.0.0.0'): - # :: is IN6ADDR_ANY, which should answer on localhost. - # ::0 and ::0.0.0.0 are non-canonical but common ways to write IN6ADDR_ANY. - return '::1' - return server_host - -def check_port(host, port, timeout=1.0): - """Raise an error if the given port is not free on the given host.""" - if not host: - raise ValueError("Host values of '' or None are not allowed.") - host = client_host(host) - port = int(port) - - import socket - - # AF_INET or AF_INET6 socket - # Get the correct address family for our host (allows IPv6 addresses) - try: - info = socket.getaddrinfo(host, port, socket.AF_UNSPEC, - socket.SOCK_STREAM) - except socket.gaierror: - if ':' in host: - info = [(socket.AF_INET6, socket.SOCK_STREAM, 0, "", (host, port, 0, 0))] - else: - info = [(socket.AF_INET, socket.SOCK_STREAM, 0, "", (host, port))] - - for res in info: - af, socktype, proto, canonname, sa = res - s = None - try: - s = socket.socket(af, socktype, proto) - # See http://groups.google.com/group/cherrypy-users/ - # browse_frm/thread/bbfe5eb39c904fe0 - s.settimeout(timeout) - s.connect((host, port)) - s.close() - raise IOError("Port %s is in use on %s; perhaps the previous " - "httpserver did not shut down properly." % - (repr(port), repr(host))) - except socket.error: - if s: - s.close() - -def wait_for_free_port(host, port): - """Wait for the specified port to become free (drop requests).""" - if not host: - raise ValueError("Host values of '' or None are not allowed.") - - for trial in range(50): - try: - # we are expecting a free port, so reduce the timeout - check_port(host, port, timeout=0.1) - except IOError: - # Give the old server thread time to free the port. - time.sleep(0.1) - else: - return - - raise IOError("Port %r not free on %r" % (port, host)) - -def wait_for_occupied_port(host, port): - """Wait for the specified port to become active (receive requests).""" - if not host: - raise ValueError("Host values of '' or None are not allowed.") - - for trial in range(50): - try: - check_port(host, port) - except IOError: - return - else: - time.sleep(.1) - - raise IOError("Port %r not bound on %r" % (port, host)) diff --git a/cherrypy/process/win32.py b/cherrypy/process/win32.py deleted file mode 100755 index 83f99a5..0000000 --- a/cherrypy/process/win32.py +++ /dev/null @@ -1,174 +0,0 @@ -"""Windows service. Requires pywin32.""" - -import os -import win32api -import win32con -import win32event -import win32service -import win32serviceutil - -from cherrypy.process import wspbus, plugins - - -class ConsoleCtrlHandler(plugins.SimplePlugin): - """A WSPBus plugin for handling Win32 console events (like Ctrl-C).""" - - def __init__(self, bus): - self.is_set = False - plugins.SimplePlugin.__init__(self, bus) - - def start(self): - if self.is_set: - self.bus.log('Handler for console events already set.', level=40) - return - - result = win32api.SetConsoleCtrlHandler(self.handle, 1) - if result == 0: - self.bus.log('Could not SetConsoleCtrlHandler (error %r)' % - win32api.GetLastError(), level=40) - else: - self.bus.log('Set handler for console events.', level=40) - self.is_set = True - - def stop(self): - if not self.is_set: - self.bus.log('Handler for console events already off.', level=40) - return - - try: - result = win32api.SetConsoleCtrlHandler(self.handle, 0) - except ValueError: - # "ValueError: The object has not been registered" - result = 1 - - if result == 0: - self.bus.log('Could not remove SetConsoleCtrlHandler (error %r)' % - win32api.GetLastError(), level=40) - else: - self.bus.log('Removed handler for console events.', level=40) - self.is_set = False - - def handle(self, event): - """Handle console control events (like Ctrl-C).""" - if event in (win32con.CTRL_C_EVENT, win32con.CTRL_LOGOFF_EVENT, - win32con.CTRL_BREAK_EVENT, win32con.CTRL_SHUTDOWN_EVENT, - win32con.CTRL_CLOSE_EVENT): - self.bus.log('Console event %s: shutting down bus' % event) - - # Remove self immediately so repeated Ctrl-C doesn't re-call it. - try: - self.stop() - except ValueError: - pass - - self.bus.exit() - # 'First to return True stops the calls' - return 1 - return 0 - - -class Win32Bus(wspbus.Bus): - """A Web Site Process Bus implementation for Win32. - - Instead of time.sleep, this bus blocks using native win32event objects. - """ - - def __init__(self): - self.events = {} - wspbus.Bus.__init__(self) - - def _get_state_event(self, state): - """Return a win32event for the given state (creating it if needed).""" - try: - return self.events[state] - except KeyError: - event = win32event.CreateEvent(None, 0, 0, - "WSPBus %s Event (pid=%r)" % - (state.name, os.getpid())) - self.events[state] = event - return event - - def _get_state(self): - return self._state - def _set_state(self, value): - self._state = value - event = self._get_state_event(value) - win32event.PulseEvent(event) - state = property(_get_state, _set_state) - - def wait(self, state, interval=0.1, channel=None): - """Wait for the given state(s), KeyboardInterrupt or SystemExit. - - Since this class uses native win32event objects, the interval - argument is ignored. - """ - if isinstance(state, (tuple, list)): - # Don't wait for an event that beat us to the punch ;) - if self.state not in state: - events = tuple([self._get_state_event(s) for s in state]) - win32event.WaitForMultipleObjects(events, 0, win32event.INFINITE) - else: - # Don't wait for an event that beat us to the punch ;) - if self.state != state: - event = self._get_state_event(state) - win32event.WaitForSingleObject(event, win32event.INFINITE) - - -class _ControlCodes(dict): - """Control codes used to "signal" a service via ControlService. - - User-defined control codes are in the range 128-255. We generally use - the standard Python value for the Linux signal and add 128. Example: - - >>> signal.SIGUSR1 - 10 - control_codes['graceful'] = 128 + 10 - """ - - def key_for(self, obj): - """For the given value, return its corresponding key.""" - for key, val in self.items(): - if val is obj: - return key - raise ValueError("The given object could not be found: %r" % obj) - -control_codes = _ControlCodes({'graceful': 138}) - - -def signal_child(service, command): - if command == 'stop': - win32serviceutil.StopService(service) - elif command == 'restart': - win32serviceutil.RestartService(service) - else: - win32serviceutil.ControlService(service, control_codes[command]) - - -class PyWebService(win32serviceutil.ServiceFramework): - """Python Web Service.""" - - _svc_name_ = "Python Web Service" - _svc_display_name_ = "Python Web Service" - _svc_deps_ = None # sequence of service names on which this depends - _exe_name_ = "pywebsvc" - _exe_args_ = None # Default to no arguments - - # Only exists on Windows 2000 or later, ignored on windows NT - _svc_description_ = "Python Web Service" - - def SvcDoRun(self): - from cherrypy import process - process.bus.start() - process.bus.block() - - def SvcStop(self): - from cherrypy import process - self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING) - process.bus.exit() - - def SvcOther(self, control): - process.bus.publish(control_codes.key_for(control)) - - -if __name__ == '__main__': - win32serviceutil.HandleCommandLine(PyWebService) diff --git a/cherrypy/process/wspbus.py b/cherrypy/process/wspbus.py deleted file mode 100755 index 46cd75a..0000000 --- a/cherrypy/process/wspbus.py +++ /dev/null @@ -1,393 +0,0 @@ -"""An implementation of the Web Site Process Bus. - -This module is completely standalone, depending only on the stdlib. - -Web Site Process Bus --------------------- - -A Bus object is used to contain and manage site-wide behavior: -daemonization, HTTP server start/stop, process reload, signal handling, -drop privileges, PID file management, logging for all of these, -and many more. - -In addition, a Bus object provides a place for each web framework -to register code that runs in response to site-wide events (like -process start and stop), or which controls or otherwise interacts with -the site-wide components mentioned above. For example, a framework which -uses file-based templates would add known template filenames to an -autoreload component. - -Ideally, a Bus object will be flexible enough to be useful in a variety -of invocation scenarios: - - 1. The deployer starts a site from the command line via a - framework-neutral deployment script; applications from multiple frameworks - are mixed in a single site. Command-line arguments and configuration - files are used to define site-wide components such as the HTTP server, - WSGI component graph, autoreload behavior, signal handling, etc. - 2. The deployer starts a site via some other process, such as Apache; - applications from multiple frameworks are mixed in a single site. - Autoreload and signal handling (from Python at least) are disabled. - 3. The deployer starts a site via a framework-specific mechanism; - for example, when running tests, exploring tutorials, or deploying - single applications from a single framework. The framework controls - which site-wide components are enabled as it sees fit. - -The Bus object in this package uses topic-based publish-subscribe -messaging to accomplish all this. A few topic channels are built in -('start', 'stop', 'exit', 'graceful', 'log', and 'main'). Frameworks and -site containers are free to define their own. If a message is sent to a -channel that has not been defined or has no listeners, there is no effect. - -In general, there should only ever be a single Bus object per process. -Frameworks and site containers share a single Bus object by publishing -messages and subscribing listeners. - -The Bus object works as a finite state machine which models the current -state of the process. Bus methods move it from one state to another; -those methods then publish to subscribed listeners on the channel for -the new state.:: - - O - | - V - STOPPING --> STOPPED --> EXITING -> X - A A | - | \___ | - | \ | - | V V - STARTED <-- STARTING - -""" - -import atexit -import os -import sys -import threading -import time -import traceback as _traceback -import warnings - -from cherrypy._cpcompat import set - -# Here I save the value of os.getcwd(), which, if I am imported early enough, -# will be the directory from which the startup script was run. This is needed -# by _do_execv(), to change back to the original directory before execv()ing a -# new process. This is a defense against the application having changed the -# current working directory (which could make sys.executable "not found" if -# sys.executable is a relative-path, and/or cause other problems). -_startup_cwd = os.getcwd() - -class ChannelFailures(Exception): - """Exception raised when errors occur in a listener during Bus.publish().""" - delimiter = '\n' - - def __init__(self, *args, **kwargs): - # Don't use 'super' here; Exceptions are old-style in Py2.4 - # See http://www.cherrypy.org/ticket/959 - Exception.__init__(self, *args, **kwargs) - self._exceptions = list() - - def handle_exception(self): - """Append the current exception to self.""" - self._exceptions.append(sys.exc_info()) - - def get_instances(self): - """Return a list of seen exception instances.""" - return [instance for cls, instance, traceback in self._exceptions] - - def __str__(self): - exception_strings = map(repr, self.get_instances()) - return self.delimiter.join(exception_strings) - - __repr__ = __str__ - - def __nonzero__(self): - return bool(self._exceptions) - -# Use a flag to indicate the state of the bus. -class _StateEnum(object): - class State(object): - name = None - def __repr__(self): - return "states.%s" % self.name - - def __setattr__(self, key, value): - if isinstance(value, self.State): - value.name = key - object.__setattr__(self, key, value) -states = _StateEnum() -states.STOPPED = states.State() -states.STARTING = states.State() -states.STARTED = states.State() -states.STOPPING = states.State() -states.EXITING = states.State() - - -class Bus(object): - """Process state-machine and messenger for HTTP site deployment. - - All listeners for a given channel are guaranteed to be called even - if others at the same channel fail. Each failure is logged, but - execution proceeds on to the next listener. The only way to stop all - processing from inside a listener is to raise SystemExit and stop the - whole server. - """ - - states = states - state = states.STOPPED - execv = False - - def __init__(self): - self.execv = False - self.state = states.STOPPED - self.listeners = dict( - [(channel, set()) for channel - in ('start', 'stop', 'exit', 'graceful', 'log', 'main')]) - self._priorities = {} - - def subscribe(self, channel, callback, priority=None): - """Add the given callback at the given channel (if not present).""" - if channel not in self.listeners: - self.listeners[channel] = set() - self.listeners[channel].add(callback) - - if priority is None: - priority = getattr(callback, 'priority', 50) - self._priorities[(channel, callback)] = priority - - def unsubscribe(self, channel, callback): - """Discard the given callback (if present).""" - listeners = self.listeners.get(channel) - if listeners and callback in listeners: - listeners.discard(callback) - del self._priorities[(channel, callback)] - - def publish(self, channel, *args, **kwargs): - """Return output of all subscribers for the given channel.""" - if channel not in self.listeners: - return [] - - exc = ChannelFailures() - output = [] - - items = [(self._priorities[(channel, listener)], listener) - for listener in self.listeners[channel]] - items.sort() - for priority, listener in items: - try: - output.append(listener(*args, **kwargs)) - except KeyboardInterrupt: - raise - except SystemExit, e: - # If we have previous errors ensure the exit code is non-zero - if exc and e.code == 0: - e.code = 1 - raise - except: - exc.handle_exception() - if channel == 'log': - # Assume any further messages to 'log' will fail. - pass - else: - self.log("Error in %r listener %r" % (channel, listener), - level=40, traceback=True) - if exc: - raise exc - return output - - def _clean_exit(self): - """An atexit handler which asserts the Bus is not running.""" - if self.state != states.EXITING: - warnings.warn( - "The main thread is exiting, but the Bus is in the %r state; " - "shutting it down automatically now. You must either call " - "bus.block() after start(), or call bus.exit() before the " - "main thread exits." % self.state, RuntimeWarning) - self.exit() - - def start(self): - """Start all services.""" - atexit.register(self._clean_exit) - - self.state = states.STARTING - self.log('Bus STARTING') - try: - self.publish('start') - self.state = states.STARTED - self.log('Bus STARTED') - except (KeyboardInterrupt, SystemExit): - raise - except: - self.log("Shutting down due to error in start listener:", - level=40, traceback=True) - e_info = sys.exc_info() - try: - self.exit() - except: - # Any stop/exit errors will be logged inside publish(). - pass - raise e_info[0], e_info[1], e_info[2] - - def exit(self): - """Stop all services and prepare to exit the process.""" - exitstate = self.state - try: - self.stop() - - self.state = states.EXITING - self.log('Bus EXITING') - self.publish('exit') - # This isn't strictly necessary, but it's better than seeing - # "Waiting for child threads to terminate..." and then nothing. - self.log('Bus EXITED') - except: - # This method is often called asynchronously (whether thread, - # signal handler, console handler, or atexit handler), so we - # can't just let exceptions propagate out unhandled. - # Assume it's been logged and just die. - os._exit(70) # EX_SOFTWARE - - if exitstate == states.STARTING: - # exit() was called before start() finished, possibly due to - # Ctrl-C because a start listener got stuck. In this case, - # we could get stuck in a loop where Ctrl-C never exits the - # process, so we just call os.exit here. - os._exit(70) # EX_SOFTWARE - - def restart(self): - """Restart the process (may close connections). - - This method does not restart the process from the calling thread; - instead, it stops the bus and asks the main thread to call execv. - """ - self.execv = True - self.exit() - - def graceful(self): - """Advise all services to reload.""" - self.log('Bus graceful') - self.publish('graceful') - - def block(self, interval=0.1): - """Wait for the EXITING state, KeyboardInterrupt or SystemExit. - - This function is intended to be called only by the main thread. - After waiting for the EXITING state, it also waits for all threads - to terminate, and then calls os.execv if self.execv is True. This - design allows another thread to call bus.restart, yet have the main - thread perform the actual execv call (required on some platforms). - """ - try: - self.wait(states.EXITING, interval=interval, channel='main') - except (KeyboardInterrupt, IOError): - # The time.sleep call might raise - # "IOError: [Errno 4] Interrupted function call" on KBInt. - self.log('Keyboard Interrupt: shutting down bus') - self.exit() - except SystemExit: - self.log('SystemExit raised: shutting down bus') - self.exit() - raise - - # Waiting for ALL child threads to finish is necessary on OS X. - # See http://www.cherrypy.org/ticket/581. - # It's also good to let them all shut down before allowing - # the main thread to call atexit handlers. - # See http://www.cherrypy.org/ticket/751. - self.log("Waiting for child threads to terminate...") - for t in threading.enumerate(): - if t != threading.currentThread() and t.isAlive(): - # Note that any dummy (external) threads are always daemonic. - if hasattr(threading.Thread, "daemon"): - # Python 2.6+ - d = t.daemon - else: - d = t.isDaemon() - if not d: - self.log("Waiting for thread %s." % t.getName()) - t.join() - - if self.execv: - self._do_execv() - - def wait(self, state, interval=0.1, channel=None): - """Poll for the given state(s) at intervals; publish to channel.""" - if isinstance(state, (tuple, list)): - states = state - else: - states = [state] - - def _wait(): - while self.state not in states: - time.sleep(interval) - self.publish(channel) - - # From http://psyco.sourceforge.net/psycoguide/bugs.html: - # "The compiled machine code does not include the regular polling - # done by Python, meaning that a KeyboardInterrupt will not be - # detected before execution comes back to the regular Python - # interpreter. Your program cannot be interrupted if caught - # into an infinite Psyco-compiled loop." - try: - sys.modules['psyco'].cannotcompile(_wait) - except (KeyError, AttributeError): - pass - - _wait() - - def _do_execv(self): - """Re-execute the current process. - - This must be called from the main thread, because certain platforms - (OS X) don't allow execv to be called in a child thread very well. - """ - args = sys.argv[:] - self.log('Re-spawning %s' % ' '.join(args)) - - if sys.platform[:4] == 'java': - from _systemrestart import SystemRestart - raise SystemRestart - else: - args.insert(0, sys.executable) - if sys.platform == 'win32': - args = ['"%s"' % arg for arg in args] - - os.chdir(_startup_cwd) - os.execv(sys.executable, args) - - def stop(self): - """Stop all services.""" - self.state = states.STOPPING - self.log('Bus STOPPING') - self.publish('stop') - self.state = states.STOPPED - self.log('Bus STOPPED') - - def start_with_callback(self, func, args=None, kwargs=None): - """Start 'func' in a new thread T, then start self (and return T).""" - if args is None: - args = () - if kwargs is None: - kwargs = {} - args = (func,) + args - - def _callback(func, *a, **kw): - self.wait(states.STARTED) - func(*a, **kw) - t = threading.Thread(target=_callback, args=args, kwargs=kwargs) - t.setName('Bus Callback ' + t.getName()) - t.start() - - self.start() - - return t - - def log(self, msg="", level=20, traceback=False): - """Log the given message. Append the last traceback if requested.""" - if traceback: - exc = sys.exc_info() - msg += "\n" + "".join(_traceback.format_exception(*exc)) - self.publish('log', msg, level) - -bus = Bus() |