def spawnNewChild(self):
"""
STEP 1 (parent): New child spawning starts by killing the current
child.
"""
if not self.active:
raise CannotSpawnNewChild("Loop not started yet")
if self.forking:
raise CannotSpawnNewChild("Serious forking action is already going on. Cannot fork now.")
if self.child_pid is None:
raise CannotSpawnNewChild("No killing yet. Not started child yet")
self.pause = False
if not self.killed_child or self.isChild():
self._killChild()
else:
# Ok, we already have sent the SIGINT the child, but asking for new child
logger.info("Not sending SIGINT because we already killed the child. Just scheduling new fork.")
self._scheduleFork()
self.killed_child = True
def spawnNewChild(self):
"""
STEP 1 (parent): New child spawning starts by killing the current
child.
"""
if not self.active:
raise CannotSpawnNewChild("Loop not started yet")
if self.forking:
raise CannotSpawnNewChild("Serious forking action is already "
"going on. Cannot fork now.")
if self.child_pid is None:
raise CannotSpawnNewChild("No killing yet. Not started child yet")
self.pause = False
if not self.killed_child or self.isChild():
self._killChild()
else:
# Ok, we already have sent the SIGINT the child, but asking for new
# child
logger.info("Not sending SIGINT because we already killed "
"the child. Just scheduling new fork.")
self._scheduleFork()
self.killed_child = True
def _parentExitHandler(self, signum=None, frame=None):
if self.isChild():
return
self.exit = True
if self.isChildAlive():
logger.info("Parent dying. Killing child first.")
self._killChild()
def _parentExitHandler(self, signum=None, frame=None):
if self.isChild():
return
self.exit = True
if self.isChildAlive():
logger.info("Parent dying. Killing child first.")
self._killChild()
def on_any_event(self, event):
ext = event.src_path.split(".")[-1].lower()
if ext not in self.allowed_extensions:
return
logger.info("Got '%s' event on %s" % (event.event_type, event.src_path))
try:
self.forkloop.spawnNewChild()
except CannotSpawnNewChild as e:
logger.error(str(e.args[0]))
def on_any_event(self, event):
ext = event.src_path.split(".")[-1].lower()
if ext not in self.allowed_extensions:
return
logger.info("Got '%s' event on %s" %
(event.event_type, event.src_path))
try:
self.forkloop.spawnNewChild()
except CannotSpawnNewChild as e:
logger.error(str(e.args[0]))
def start(self):
"""Start file monitoring thread"""
registerHandler(signal.SIGINT, self._exitHandler)
registerHandler(signal.SIGTERM, self._exitHandler)
for path in self.paths:
logger.info("Starting file monitor on %s" % path)
observer = Observer()
self.observers.append(observer)
observer.schedule(self, path=path, recursive=True)
observer.start()
def _waitChildToDieAndScheduleNew(self, signal=None, frame=None):
"""
STEP 3 (parent): Child told us via SIGCHLD that we can spawn new child
"""
try:
# Acknowledge dead child
pid, exit_status = os.wait()
logger.info("Child %d exited, reasons %s" % (pid, self._resolveExitReason(exit_status)))
except OSError:
# OSError: [Errno 10] No child processes
pass
# Schedule new
self._scheduleFork()
def start(self):
"""
Start file monitoring thread
"""
registerHandler(signal.SIGINT, self._exitHandler)
registerHandler(signal.SIGTERM, self._exitHandler)
for path in self.paths:
logger.info("Starting file monitor on %s" % path)
observer = Observer()
self.observers.append(observer)
observer.schedule(self, path=path, recursive=True)
observer.start()
def startForkLoop(event):
if not monkeypatcher.PATCHED:
errline()
errline("sauna.reload is not installed correctly!")
errline("Your are missing following line from instance part "
"of your buildout:")
errline()
errline(" zope-conf-additional = %import sauna.reload")
errline()
errline("Not starting fork loop.")
errline()
return
if not reload_paths:
errline()
errline("sauna.reload: No paths in RELOAD_PATH environment variable. "
"Not starting fork loop.")
errline("Set it to your development egg paths to activate reloading")
errline()
errline("Example:")
errline(" $ RELOAD_PATH=src/ bin/instance fg")
errline()
return
# Start fs monitor before the forkloop
watcher.Watcher(reload_paths.getParentPaths(), forkloop).start()
# Build and execute a configuration file to include meta, configuration and
# overrides for dependencies of the deferred development packages.
autoinclude.includeDependenciesForDeferred()
autoinclude.checkDeferringErrors()
config = getConfiguration()
zserver = [
server for server in config.servers
if isinstance(server, zhttp_server)
][0]
logger.info("We saved at least %s seconds from boot up time" %
(time.time() - forkloop.boot_started))
logger.info("Overview available at http://127.0.0.1:%i/@@saunareload" %
(zserver.port))
forkloop.start()
def on_any_event(self, event):
ext = event.src_path.split(".")[-1].lower()
if ext not in self.allowed_extensions:
return
logger.info("Got '%s' event on %s" %
(event.event_type, event.src_path))
if ext in ( "html", "xml" ):
notify(ThemeChanged())
logger.info("Signaling plone.app.theming")
return
try:
self.forkloop.spawnNewChild()
except CannotSpawnNewChild as e:
logger.error(str(e.args[0]))
def startForkLoop(event):
if not monkeypatcher.PATCHED:
errline()
errline("sauna.reload is not installed correctly!")
errline("Your are missing following line from instance part "
"of your buildout:")
errline()
errline(" zope-conf-additional = %import sauna.reload")
errline()
errline("Not starting fork loop.")
errline()
return
if not reload_paths:
errline()
errline("sauna.reload: No paths in RELOAD_PATH environment variable. "
"Not starting fork loop.")
errline("Set it to your development egg paths to activate reloading")
errline()
errline("Example:")
errline(" $ RELOAD_PATH=src/ bin/instance fg")
errline()
return
# Start fs monitor before the forkloop
watcher.Watcher(reload_paths.getParentPaths(), forkloop).start()
# Build and execute a configuration file to include meta, configuration and
# overrides for dependencies of the deferred development packages.
autoinclude.includeDependenciesForDeferred()
autoinclude.checkDeferringErrors()
config = getConfiguration()
zserver = [server for server in config.servers
if isinstance(server, zhttp_server)][0]
logger.info("We saved at least %s seconds from boot up time" %
(time.time() - forkloop.boot_started))
logger.info("Overview available at http://127.0.0.1:%i/@@saunareload" %
(zserver.port))
forkloop.start()
def loop(self):
"""
Magic happens here
"""
registerHandler(signal.SIGINT, self._parentExitHandler)
registerHandler(signal.SIGTERM, self._parentExitHandler)
self.active = True
logger.info("Fork loop starting on parent. PID %i" % os.getpid())
while True:
self.forking = False
if self.exit:
return
if self.fork:
self.fork = False
if self.pause:
# Pause mode. No forks now.
continue
if not self.killed_child:
errline()
errline("Child died on bootup. Pausing fork loop for now. ")
errline("Fix possible errors and save edits and we'll try booting again.")
errline("Waiting...")
# Child died because of unknown reason. Mark it as killed
# and go into pause mode.
self.killed_child = True
self.pause = True
continue
if self.isChildAlive():
# Child is still alive for some reason. Lets wait few
# rounds for it to die.
continue
self.forking = True
self.startChildBooTimer()
self.child_pid = os.fork()
if self.child_pid == 0:
break
self.killed_child = False
time.sleep(1)
logger.setChildLogger()
logger.info("Forked new child. Installing reloadable products...")
self._prepareNewChild()
self.forking = False
logger.info("Booted up new new child in %s seconds. PID %i" % (
time.time() - self.child_started, os.getpid()))
notify(NewChildIsReady(self))
def loop(self):
"""
Magic happens here
"""
registerHandler(signal.SIGINT, self._parentExitHandler)
registerHandler(signal.SIGTERM, self._parentExitHandler)
self.active = True
logger.info("Fork loop starting on parent. PID %i" % os.getpid())
while True:
self.forking = False
if self.exit:
return
if self.fork:
self.fork = False
if self.pause:
# Pause mode. No forks now.
continue
if not self.killed_child:
errline()
errline("Child died on bootup. "
"Pausing fork loop for now.")
errline("Fix possible errors and save edits "
"and we'll try booting again.")
errline("Waiting...")
# Child died because of unknown reason. Mark it as killed
# and go into pause mode.
self.killed_child = True
self.pause = True
continue
if self.isChildAlive():
# Child is still alive for some reason. Lets wait few
# rounds for it to die.
continue
self.forking = True
self.startChildBooTimer()
self.child_pid = os.fork()
if self.child_pid == 0:
break
self.killed_child = False
time.sleep(1)
logger.setChildLogger()
logger.info("Forked new child. Installing reloadable products...")
self._prepareNewChild()
self.forking = False
logger.logDeferredErrors()
logger.logDeferred()
logger.info("Booted up new child in %s seconds. PID %i" %
(time.time() - self.child_started, os.getpid()))
notify(NewChildIsReady(self))
