def __init__(self):
super(ReactorBase, self).__init__()
self.threadCallQueue = []
self._eventTriggers = {}
self._pendingTimedCalls = []
self._newTimedCalls = []
self._cancellations = 0
self.running = False
self._started = False
self._justStopped = False
self._startedBefore = False
# reactor internal readers, e.g. the waker.
self._internalReaders = set()
self.waker = None
# Arrange for the running attribute to change to True at the right time
# and let a subclass possibly do other things at that time (eg install
# signal handlers).
self.addSystemEventTrigger(
'during', 'startup', self._reallyStartRunning)
self.addSystemEventTrigger('during', 'shutdown', self.crash)
self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
self.installWaker()
def __init__(self):
self.threadCallQueue = []
self._eventTriggers = {}
self._pendingTimedCalls = []
self._newTimedCalls = []
self._cancellations = 0
self.running = False
self._started = False
self._justStopped = False
self._startedBefore = False
# reactor internal readers, e.g. the waker.
self._internalReaders = set()
self._nameResolver = None
self.waker = None
# Arrange for the running attribute to change to True at the right time
# and let a subclass possibly do other things at that time (eg install
# signal handlers).
self.addSystemEventTrigger(
'during', 'startup', self._reallyStartRunning)
self.addSystemEventTrigger('during', 'shutdown', self.crash)
self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
self.installWaker()
def __init__(self) -> None:
super().__init__()
self.threadCallQueue: List[_ThreadCall] = []
self._eventTriggers: Dict[str, _ThreePhaseEvent] = {}
self._pendingTimedCalls: List[DelayedCall] = []
self._newTimedCalls: List[DelayedCall] = []
self._cancellations = 0
self.running = False
self._started = False
self._justStopped = False
self._startedBefore = False
# reactor internal readers, e.g. the waker.
# Using Any as the type here… unable to find a suitable defined interface
self._internalReaders: Set[Any] = set()
self.waker: Any = None
# Arrange for the running attribute to change to True at the right time
# and let a subclass possibly do other things at that time (eg install
# signal handlers).
self.addSystemEventTrigger("during", "startup",
self._reallyStartRunning)
self.addSystemEventTrigger("during", "shutdown", self.crash)
self.addSystemEventTrigger("during", "shutdown", self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
self.installWaker()
def _handleSigchld(self,
signum,
frame,
_threadSupport=platform.supportsThreads()):
from twisted.internet.process import reapAllProcesses
if _threadSupport:
self.callFromThread(reapAllProcesses)
else:
self.callLater(0, reapAllProcesses)
def __init__(self):
self.threadCallQueue = []
self._eventTriggers = {}
self._pendingTimedCalls = []
self._newTimedCalls = []
self._cancellations = 0
self.running = 0
self.waker = None
self.addSystemEventTrigger('during', 'shutdown', self.crash)
self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
def _handleSigchld(self, signum, frame, _threadSupport=platform.supportsThreads()):
"""Reap all processes on SIGCHLD.
This gets called on SIGCHLD. We do no processing inside a signal
handler, as the calls we make here could occur between any two
python bytecode instructions. Deferring processing to the next
eventloop round prevents us from violating the state constraints
of arbitrary classes.
"""
if _threadSupport:
self.callFromThread(process.reapAllProcesses)
else:
self.callLater(0, process.reapAllProcesses)
def _handleSigchld(self, signum, frame, _threadSupport=platform.supportsThreads()):
"""Reap all processes on SIGCHLD.
This gets called on SIGCHLD. We do no processing inside a signal
handler, as the calls we make here could occur between any two
python bytecode instructions. Deferring processing to the next
eventloop round prevents us from violating the state constraints
of arbitrary classes.
"""
if _threadSupport:
self.callFromThread(process.reapAllProcesses)
else:
self.callLater(0, process.reapAllProcesses)
def __init__(self):
self.threadCallQueue = []
self._eventTriggers = {}
self._pendingTimedCalls = []
self._newTimedCalls = []
self._cancellations = 0
self.running = 0
self.waker = None
self.addSystemEventTrigger('during', 'shutdown', self.crash)
self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
def _handleSigchld(self, signum, frame, _threadSupport=platform.supportsThreads()):
from twisted.internet.process import reapAllProcesses
if _threadSupport:
self.callFromThread(reapAllProcesses)
else:
self.callLater(0, reapAllProcesses)
class ReactorBase(object):
"""
Default base class for Reactors.
@type _stopped: C{bool}
@ivar _stopped: A flag which is true between paired calls to C{reactor.run}
and C{reactor.stop}. This should be replaced with an explicit state
machine.
@type _justStopped: C{bool}
@ivar _justStopped: A flag which is true between the time C{reactor.stop}
is called and the time the shutdown system event is fired. This is
used to determine whether that event should be fired after each
iteration through the mainloop. This should be replaced with an
explicit state machine.
@type _started: C{bool}
@ivar _started: A flag which is true from the time C{reactor.run} is called
until the time C{reactor.run} returns. This is used to prevent calls
to C{reactor.run} on a running reactor. This should be replaced with
an explicit state machine.
@ivar running: See L{IReactorCore.running}
"""
implements(IReactorCore, IReactorTime, IReactorPluggableResolver)
_stopped = True
installed = False
usingThreads = False
resolver = BlockingResolver()
__name__ = "twisted.internet.reactor"
def __init__(self):
self.threadCallQueue = []
self._eventTriggers = {}
self._pendingTimedCalls = []
self._newTimedCalls = []
self._cancellations = 0
self.running = False
self._started = False
self._justStopped = False
self.waker = None
# Arrange for the running attribute to change to True at the right time
# and let a subclass possibly do other things at that time (eg install
# signal handlers).
self.addSystemEventTrigger(
'during', 'startup', self._reallyStartRunning)
self.addSystemEventTrigger('during', 'shutdown', self.crash)
self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
# override in subclasses
_lock = None
def installWaker(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement installWaker")
def installResolver(self, resolver):
assert IResolverSimple.providedBy(resolver)
oldResolver = self.resolver
self.resolver = resolver
return oldResolver
def wakeUp(self):
"""Wake up the event loop."""
if not threadable.isInIOThread():
if self.waker:
self.waker.wakeUp()
# if the waker isn't installed, the reactor isn't running, and
# therefore doesn't need to be woken up
def doIteration(self, delay):
"""
Do one iteration over the readers and writers which have been added.
"""
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement doIteration")
def addReader(self, reader):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement addReader")
def addWriter(self, writer):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement addWriter")
def removeReader(self, reader):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeReader")
def removeWriter(self, writer):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeWriter")
def removeAll(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeAll")
def getReaders(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement getReaders")
def getWriters(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement getWriters")
def resolve(self, name, timeout = (1, 3, 11, 45)):
"""Return a Deferred that will resolve a hostname.
"""
if not name:
# XXX - This is *less than* '::', and will screw up IPv6 servers
return defer.succeed('0.0.0.0')
if abstract.isIPAddress(name):
return defer.succeed(name)
return self.resolver.getHostByName(name, timeout)
# Installation.
# IReactorCore
def stop(self):
"""
See twisted.internet.interfaces.IReactorCore.stop.
"""
if self._stopped:
raise error.ReactorNotRunning(
"Can't stop reactor that isn't running.")
self._stopped = True
self._justStopped = True
def crash(self):
"""
See twisted.internet.interfaces.IReactorCore.crash.
Reset reactor state tracking attributes and re-initialize certain
state-transition helpers which were set up in C{__init__} but later
destroyed (through use).
"""
self._started = False
self.running = False
self.addSystemEventTrigger(
'during', 'startup', self._reallyStartRunning)
def sigInt(self, *args):
"""Handle a SIGINT interrupt.
"""
log.msg("Received SIGINT, shutting down.")
self.callFromThread(self.stop)
def sigBreak(self, *args):
"""Handle a SIGBREAK interrupt.
"""
log.msg("Received SIGBREAK, shutting down.")
self.callFromThread(self.stop)
def sigTerm(self, *args):
"""Handle a SIGTERM interrupt.
"""
log.msg("Received SIGTERM, shutting down.")
self.callFromThread(self.stop)
def disconnectAll(self):
"""Disconnect every reader, and writer in the system.
"""
selectables = self.removeAll()
for reader in selectables:
log.callWithLogger(reader,
reader.connectionLost,
failure.Failure(main.CONNECTION_LOST))
def iterate(self, delay=0):
"""See twisted.internet.interfaces.IReactorCore.iterate.
"""
self.runUntilCurrent()
self.doIteration(delay)
def fireSystemEvent(self, eventType):
"""See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
"""
event = self._eventTriggers.get(eventType)
if event is not None:
event.fireEvent()
def addSystemEventTrigger(self, _phase, _eventType, _f, *args, **kw):
"""See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger.
"""
assert callable(_f), "%s is not callable" % _f
if _eventType not in self._eventTriggers:
self._eventTriggers[_eventType] = _ThreePhaseEvent()
return (_eventType, self._eventTriggers[_eventType].addTrigger(
_phase, _f, *args, **kw))
def removeSystemEventTrigger(self, triggerID):
"""See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger.
"""
eventType, handle = triggerID
self._eventTriggers[eventType].removeTrigger(handle)
def callWhenRunning(self, _callable, *args, **kw):
"""See twisted.internet.interfaces.IReactorCore.callWhenRunning.
"""
if self.running:
_callable(*args, **kw)
else:
return self.addSystemEventTrigger('after', 'startup',
_callable, *args, **kw)
def startRunning(self):
"""
Method called when reactor starts: do some initialization and fire
startup events.
Don't call this directly, call reactor.run() instead: it should take
care of calling this.
This method is somewhat misnamed. The reactor will not necessarily be
in the running state by the time this method returns. The only
guarantee is that it will be on its way to the running state.
"""
if self._started:
warnings.warn(
"Reactor already running! This behavior is deprecated "
"since Twisted 8.0",
category=DeprecationWarning, stacklevel=4)
self._started = True
self._stopped = False
threadable.registerAsIOThread()
self.fireSystemEvent('startup')
def _reallyStartRunning(self):
"""
Method called to transition to the running state. This should happen
in the I{during startup} event trigger phase.
"""
self.running = True
# IReactorTime
seconds = staticmethod(runtimeSeconds)
def callLater(self, _seconds, _f, *args, **kw):
"""See twisted.internet.interfaces.IReactorTime.callLater.
"""
assert callable(_f), "%s is not callable" % _f
assert sys.maxint >= _seconds >= 0, \
"%s is not greater than or equal to 0 seconds" % (_seconds,)
tple = DelayedCall(self.seconds() + _seconds, _f, args, kw,
self._cancelCallLater,
self._moveCallLaterSooner,
seconds=self.seconds)
self._newTimedCalls.append(tple)
return tple
def _moveCallLaterSooner(self, tple):
# Linear time find: slow.
heap = self._pendingTimedCalls
try:
pos = heap.index(tple)
# Move elt up the heap until it rests at the right place.
elt = heap[pos]
while pos != 0:
parent = (pos-1) // 2
if heap[parent] <= elt:
break
# move parent down
heap[pos] = heap[parent]
pos = parent
heap[pos] = elt
except ValueError:
# element was not found in heap - oh well...
pass
def _cancelCallLater(self, tple):
self._cancellations+=1
def cancelCallLater(self, callID):
"""See twisted.internet.interfaces.IReactorTime.cancelCallLater.
"""
# DO NOT DELETE THIS - this is documented in Python in a Nutshell, so we
# we can't get rid of it for a long time.
warnings.warn("reactor.cancelCallLater(callID) is deprecated - use callID.cancel() instead")
callID.cancel()
def getDelayedCalls(self):
"""Return all the outstanding delayed calls in the system.
They are returned in no particular order.
This method is not efficient -- it is really only meant for
test cases."""
return [x for x in (self._pendingTimedCalls + self._newTimedCalls) if not x.cancelled]
def _insertNewDelayedCalls(self):
for call in self._newTimedCalls:
if call.cancelled:
self._cancellations-=1
else:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
self._newTimedCalls = []
def timeout(self):
# insert new delayed calls to make sure to include them in timeout value
self._insertNewDelayedCalls()
if not self._pendingTimedCalls:
return None
return max(0, self._pendingTimedCalls[0].time - self.seconds())
def runUntilCurrent(self):
"""Run all pending timed calls.
"""
if self.threadCallQueue:
# Keep track of how many calls we actually make, as we're
# making them, in case another call is added to the queue
# while we're in this loop.
count = 0
total = len(self.threadCallQueue)
for (f, a, kw) in self.threadCallQueue:
try:
f(*a, **kw)
except:
log.err()
count += 1
if count == total:
break
del self.threadCallQueue[:count]
if self.threadCallQueue:
if self.waker:
self.waker.wakeUp()
# insert new delayed calls now
self._insertNewDelayedCalls()
now = self.seconds()
while self._pendingTimedCalls and (self._pendingTimedCalls[0].time <= now):
call = heappop(self._pendingTimedCalls)
if call.cancelled:
self._cancellations-=1
continue
if call.delayed_time > 0:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
continue
try:
call.called = 1
call.func(*call.args, **call.kw)
except:
log.deferr()
if hasattr(call, "creator"):
e = "\n"
e += " C: previous exception occurred in " + \
"a DelayedCall created here:\n"
e += " C:"
e += "".join(call.creator).rstrip().replace("\n","\n C:")
e += "\n"
log.msg(e)
if (self._cancellations > 50 and
self._cancellations > len(self._pendingTimedCalls) >> 1):
self._cancellations = 0
self._pendingTimedCalls = [x for x in self._pendingTimedCalls
if not x.cancelled]
heapify(self._pendingTimedCalls)
if self._justStopped:
self._justStopped = False
self.fireSystemEvent("shutdown")
# IReactorProcess
def _checkProcessArgs(self, args, env):
"""
Check for valid arguments and environment to spawnProcess.
@return: A two element tuple giving values to use when creating the
process. The first element of the tuple is a C{list} of C{str}
giving the values for argv of the child process. The second element
of the tuple is either C{None} if C{env} was C{None} or a C{dict}
mapping C{str} environment keys to C{str} environment values.
"""
# Any unicode string which Python would successfully implicitly
# encode to a byte string would have worked before these explicit
# checks were added. Anything which would have failed with a
# UnicodeEncodeError during that implicit encoding step would have
# raised an exception in the child process and that would have been
# a pain in the butt to debug.
#
# So, we will explicitly attempt the same encoding which Python
# would implicitly do later. If it fails, we will report an error
# without ever spawning a child process. If it succeeds, we'll save
# the result so that Python doesn't need to do it implicitly later.
#
# For any unicode which we can actually encode, we'll also issue a
# deprecation warning, because no one should be passing unicode here
# anyway.
#
# -exarkun
defaultEncoding = sys.getdefaultencoding()
# Common check function
def argChecker(arg):
"""
Return either a str or None. If the given value is not
allowable for some reason, None is returned. Otherwise, a
possibly different object which should be used in place of arg
is returned. This forces unicode encoding to happen now, rather
than implicitly later.
"""
if isinstance(arg, unicode):
try:
arg = arg.encode(defaultEncoding)
except UnicodeEncodeError:
return None
warnings.warn(
"Argument strings and environment keys/values passed to "
"reactor.spawnProcess should be str, not unicode.",
category=DeprecationWarning,
stacklevel=4)
if isinstance(arg, str) and '\0' not in arg:
return arg
return None
# Make a few tests to check input validity
if not isinstance(args, (tuple, list)):
raise TypeError("Arguments must be a tuple or list")
outputArgs = []
for arg in args:
arg = argChecker(arg)
if arg is None:
raise TypeError("Arguments contain a non-string value")
else:
outputArgs.append(arg)
outputEnv = None
if env is not None:
outputEnv = {}
for key, val in env.iteritems():
key = argChecker(key)
if key is None:
raise TypeError("Environment contains a non-string key")
val = argChecker(val)
if val is None:
raise TypeError("Environment contains a non-string value")
outputEnv[key] = val
return outputArgs, outputEnv
# IReactorThreads
if platform.supportsThreads():
threadpool = None
# ID of the trigger stopping the threadpool
threadpoolShutdownID = None
def _initThreads(self):
self.usingThreads = True
self.resolver = ThreadedResolver(self)
self.installWaker()
def callFromThread(self, f, *args, **kw):
"""
See L{twisted.internet.interfaces.IReactorThreads.callFromThread}.
"""
assert callable(f), "%s is not callable" % (f,)
# lists are thread-safe in CPython, but not in Jython
# this is probably a bug in Jython, but until fixed this code
# won't work in Jython.
self.threadCallQueue.append((f, args, kw))
self.wakeUp()
def _initThreadPool(self):
"""
Create the threadpool accessible with callFromThread.
"""
from twisted.python import threadpool
self.threadpool = threadpool.ThreadPool(0, 10, 'twisted.internet.reactor')
self.callWhenRunning(self.threadpool.start)
self.threadpoolShutdownID = self.addSystemEventTrigger(
'during', 'shutdown', self._stopThreadPool)
def _stopThreadPool(self):
"""
Stop the reactor threadpool.
"""
self.threadpoolShutdownID = None
self.threadpool.stop()
self.threadpool = None
def callInThread(self, _callable, *args, **kwargs):
"""
See L{twisted.internet.interfaces.IReactorThreads.callInThread}.
"""
if self.threadpool is None:
self._initThreadPool()
self.threadpool.callInThread(_callable, *args, **kwargs)
def suggestThreadPoolSize(self, size):
"""
See L{twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize}.
"""
if size == 0 and self.threadpool is None:
return
if self.threadpool is None:
self._initThreadPool()
self.threadpool.adjustPoolsize(maxthreads=size)
else:
# This is for signal handlers.
def callFromThread(self, f, *args, **kw):
assert callable(f), "%s is not callable" % (f,)
# See comment in the other callFromThread implementation.
self.threadCallQueue.append((f, args, kw))
"""
See L{twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize}.
"""
if size == 0 and self.threadpool is None:
return
if self.threadpool is None:
self._initThreadPool()
self.threadpool.adjustPoolsize(maxthreads=size)
else:
# This is for signal handlers.
def callFromThread(self, f, *args, **kw):
assert callable(f), "%s is not callable" % (f,)
# See comment in the other callFromThread implementation.
self.threadCallQueue.append((f, args, kw))
if platform.supportsThreads():
classImplements(ReactorBase, IReactorThreads)
class BaseConnector(styles.Ephemeral):
"""Basic implementation of connector.
State can be: "connecting", "connected", "disconnected"
"""
implements(IConnector)
timeoutID = None
factoryStarted = 0
def __init__(self, factory, timeout, reactor):
class ReactorBase(object):
"""Default base class for Reactors.
"""
implements(IReactorCore, IReactorTime, IReactorPluggableResolver)
installed = 0
usingThreads = 0
resolver = BlockingResolver()
__name__ = "twisted.internet.reactor"
def __init__(self):
self.threadCallQueue = []
self._eventTriggers = {}
self._pendingTimedCalls = []
self._newTimedCalls = []
self._cancellations = 0
self.running = 0
self.waker = None
self.addSystemEventTrigger('during', 'shutdown', self.crash)
self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
# override in subclasses
_lock = None
def installWaker(self):
raise NotImplementedError()
def installResolver(self, resolver):
assert IResolverSimple.providedBy(resolver)
oldResolver = self.resolver
self.resolver = resolver
return oldResolver
def wakeUp(self):
"""Wake up the event loop."""
if not threadable.isInIOThread():
if self.waker:
self.waker.wakeUp()
# if the waker isn't installed, the reactor isn't running, and
# therefore doesn't need to be woken up
def doIteration(self, delay):
"""Do one iteration over the readers and writers we know about."""
raise NotImplementedError
def addReader(self, reader):
raise NotImplementedError
def addWriter(self, writer):
raise NotImplementedError
def removeReader(self, reader):
raise NotImplementedError
def removeWriter(self, writer):
raise NotImplementedError
def removeAll(self):
raise NotImplementedError
def resolve(self, name, timeout=(1, 3, 11, 45)):
"""Return a Deferred that will resolve a hostname.
"""
if not name:
# XXX - This is *less than* '::', and will screw up IPv6 servers
return defer.succeed('0.0.0.0')
if abstract.isIPAddress(name):
return defer.succeed(name)
return self.resolver.getHostByName(name, timeout)
# Installation.
# IReactorCore
def stop(self):
"""See twisted.internet.interfaces.IReactorCore.stop.
"""
if not self.running:
raise RuntimeError, "can't stop reactor that isn't running"
self.fireSystemEvent("shutdown")
def crash(self):
"""See twisted.internet.interfaces.IReactorCore.crash.
"""
self.running = 0
def sigInt(self, *args):
"""Handle a SIGINT interrupt.
"""
log.msg("Received SIGINT, shutting down.")
self.callFromThread(self.stop)
def sigBreak(self, *args):
"""Handle a SIGBREAK interrupt.
"""
log.msg("Received SIGBREAK, shutting down.")
self.callFromThread(self.stop)
def sigTerm(self, *args):
"""Handle a SIGTERM interrupt.
"""
log.msg("Received SIGTERM, shutting down.")
self.callFromThread(self.stop)
def disconnectAll(self):
"""Disconnect every reader, and writer in the system.
"""
selectables = self.removeAll()
for reader in selectables:
log.callWithLogger(reader, reader.connectionLost,
failure.Failure(main.CONNECTION_LOST))
def iterate(self, delay=0):
"""See twisted.internet.interfaces.IReactorCore.iterate.
"""
self.runUntilCurrent()
self.doIteration(delay)
def fireSystemEvent(self, eventType):
"""See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
"""
sysEvtTriggers = self._eventTriggers.get(eventType)
if not sysEvtTriggers:
return
defrList = []
for callable, args, kw in sysEvtTriggers[0]:
try:
d = callable(*args, **kw)
except:
log.deferr()
else:
if isinstance(d, Deferred):
defrList.append(d)
if defrList:
DeferredList(defrList).addBoth(self._cbContinueSystemEvent,
eventType)
else:
self.callLater(0, self._continueSystemEvent, eventType)
def _cbContinueSystemEvent(self, result, eventType):
self._continueSystemEvent(eventType)
def _continueSystemEvent(self, eventType):
sysEvtTriggers = self._eventTriggers.get(eventType)
for callList in sysEvtTriggers[1], sysEvtTriggers[2]:
for callable, args, kw in callList:
try:
callable(*args, **kw)
except:
log.deferr()
# now that we've called all callbacks, no need to store
# references to them anymore, in fact this can cause problems.
del self._eventTriggers[eventType]
def addSystemEventTrigger(self, _phase, _eventType, _f, *args, **kw):
"""See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger.
"""
assert callable(_f), "%s is not callable" % _f
if self._eventTriggers.has_key(_eventType):
triglist = self._eventTriggers[_eventType]
else:
triglist = [[], [], []]
self._eventTriggers[_eventType] = triglist
evtList = triglist[{"before": 0, "during": 1, "after": 2}[_phase]]
evtList.append((_f, args, kw))
return (_phase, _eventType, (_f, args, kw))
def removeSystemEventTrigger(self, triggerID):
"""See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger.
"""
phase, eventType, item = triggerID
self._eventTriggers[eventType][{
"before": 0,
"during": 1,
"after": 2
}[phase]].remove(item)
def callWhenRunning(self, _callable, *args, **kw):
"""See twisted.internet.interfaces.IReactorCore.callWhenRunning.
"""
if self.running:
_callable(*args, **kw)
else:
return self.addSystemEventTrigger('after', 'startup', _callable,
*args, **kw)
# IReactorTime
def callLater(self, _seconds, _f, *args, **kw):
"""See twisted.internet.interfaces.IReactorTime.callLater.
"""
assert callable(_f), "%s is not callable" % _f
assert sys.maxint >= _seconds >= 0, \
"%s is not greater than or equal to 0 seconds" % (_seconds,)
tple = DelayedCall(seconds() + _seconds, _f, args, kw,
self._cancelCallLater, self._moveCallLaterSooner)
self._newTimedCalls.append(tple)
return tple
def _moveCallLaterSooner(self, tple):
# Linear time find: slow.
heap = self._pendingTimedCalls
try:
pos = heap.index(tple)
# Move elt up the heap until it rests at the right place.
elt = heap[pos]
while pos != 0:
parent = (pos - 1) // 2
if heap[parent] <= elt:
break
# move parent down
heap[pos] = heap[parent]
pos = parent
heap[pos] = elt
except ValueError:
# element was not found in heap - oh well...
pass
def _cancelCallLater(self, tple):
self._cancellations += 1
def cancelCallLater(self, callID):
"""See twisted.internet.interfaces.IReactorTime.cancelCallLater.
"""
# DO NOT DELETE THIS - this is documented in Python in a Nutshell, so we
# we can't get rid of it for a long time.
warnings.warn(
"reactor.cancelCallLater(callID) is deprecated - use callID.cancel() instead"
)
callID.cancel()
def getDelayedCalls(self):
"""Return all the outstanding delayed calls in the system.
They are returned in no particular order.
This method is not efficient -- it is really only meant for
test cases."""
return [
x for x in (self._pendingTimedCalls + self._newTimedCalls)
if not x.cancelled
]
def _insertNewDelayedCalls(self):
for call in self._newTimedCalls:
if call.cancelled:
self._cancellations -= 1
else:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
self._newTimedCalls = []
def timeout(self):
# insert new delayed calls to make sure to include them in timeout value
self._insertNewDelayedCalls()
if not self._pendingTimedCalls:
return None
return max(0, self._pendingTimedCalls[0].time - seconds())
def runUntilCurrent(self):
"""Run all pending timed calls.
"""
if self.threadCallQueue:
# Keep track of how many calls we actually make, as we're
# making them, in case another call is added to the queue
# while we're in this loop.
count = 0
total = len(self.threadCallQueue)
for (f, a, kw) in self.threadCallQueue:
try:
f(*a, **kw)
except:
log.err()
count += 1
if count == total:
break
del self.threadCallQueue[:count]
if self.threadCallQueue:
if self.waker:
self.waker.wakeUp()
# insert new delayed calls now
self._insertNewDelayedCalls()
now = seconds()
while self._pendingTimedCalls and (self._pendingTimedCalls[0].time <=
now):
call = heappop(self._pendingTimedCalls)
if call.cancelled:
self._cancellations -= 1
continue
if call.delayed_time > 0:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
continue
try:
call.called = 1
call.func(*call.args, **call.kw)
except:
log.deferr()
if hasattr(call, "creator"):
e = "\n"
e += " C: previous exception occurred in " + \
"a DelayedCall created here:\n"
e += " C:"
e += "".join(call.creator).rstrip().replace("\n", "\n C:")
e += "\n"
log.msg(e)
if (self._cancellations > 50
and self._cancellations > len(self._pendingTimedCalls) >> 1):
self._cancellations = 0
self._pendingTimedCalls = [
x for x in self._pendingTimedCalls if not x.cancelled
]
heapify(self._pendingTimedCalls)
# IReactorThreads
if platform.supportsThreads():
threadpool = None
def _initThreads(self):
self.usingThreads = 1
self.resolver = ThreadedResolver(self)
self.installWaker()
def callFromThread(self, f, *args, **kw):
"""See twisted.internet.interfaces.IReactorThreads.callFromThread.
"""
assert callable(f), "%s is not callable" % (f, )
# lists are thread-safe in CPython, but not in Jython
# this is probably a bug in Jython, but until fixed this code
# won't work in Jython.
self.threadCallQueue.append((f, args, kw))
self.wakeUp()
def _initThreadPool(self):
from twisted.python import threadpool
self.threadpool = threadpool.ThreadPool(
0, 10, 'twisted.internet.reactor')
self.callWhenRunning(self.threadpool.start)
self.addSystemEventTrigger('during', 'shutdown',
self.threadpool.stop)
def callInThread(self, _callable, *args, **kwargs):
"""See twisted.internet.interfaces.IReactorThreads.callInThread.
"""
if self.threadpool is None:
self._initThreadPool()
self.threadpool.callInThread(_callable, *args, **kwargs)
def suggestThreadPoolSize(self, size):
"""See twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize.
"""
if size == 0 and not self.threadpool:
return
if not self.threadpool:
self._initThreadPool()
self.threadpool.adjustPoolsize(maxthreads=size)
else:
# This is for signal handlers.
def callFromThread(self, f, *args, **kw):
assert callable(f), "%s is not callable" % (f, )
# See comment in the other callFromThread implementation.
self.threadCallQueue.append((f, args, kw))
class ReactorBase(PluggableResolverMixin):
"""
Default base class for Reactors.
@type _stopped: C{bool}
@ivar _stopped: A flag which is true between paired calls to C{reactor.run}
and C{reactor.stop}. This should be replaced with an explicit state
machine.
@type _justStopped: C{bool}
@ivar _justStopped: A flag which is true between the time C{reactor.stop}
is called and the time the shutdown system event is fired. This is
used to determine whether that event should be fired after each
iteration through the mainloop. This should be replaced with an
explicit state machine.
@type _started: C{bool}
@ivar _started: A flag which is true from the time C{reactor.run} is called
until the time C{reactor.run} returns. This is used to prevent calls
to C{reactor.run} on a running reactor. This should be replaced with
an explicit state machine.
@ivar running: See L{IReactorCore.running}
@ivar _registerAsIOThread: A flag controlling whether the reactor will
register the thread it is running in as the I/O thread when it starts.
If C{True}, registration will be done, otherwise it will not be.
@ivar _exitSignal: See L{_ISupportsExitSignalCapturing._exitSignal}
"""
_registerAsIOThread = True
_stopped = True
installed = False
usingThreads = False
_exitSignal = None
__name__ = "twisted.internet.reactor"
def __init__(self):
super(ReactorBase, self).__init__()
self.threadCallQueue = []
self._eventTriggers = {}
self._pendingTimedCalls = []
self._newTimedCalls = []
self._cancellations = 0
self.running = False
self._started = False
self._justStopped = False
self._startedBefore = False
# reactor internal readers, e.g. the waker.
self._internalReaders = set()
self.waker = None
# Arrange for the running attribute to change to True at the right time
# and let a subclass possibly do other things at that time (eg install
# signal handlers).
self.addSystemEventTrigger(
'during', 'startup', self._reallyStartRunning)
self.addSystemEventTrigger('during', 'shutdown', self.crash)
self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
self.installWaker()
# override in subclasses
_lock = None
def installWaker(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement installWaker")
def wakeUp(self):
"""
Wake up the event loop.
"""
if self.waker:
self.waker.wakeUp()
# if the waker isn't installed, the reactor isn't running, and
# therefore doesn't need to be woken up
def doIteration(self, delay):
"""
Do one iteration over the readers and writers which have been added.
"""
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement doIteration")
def addReader(self, reader):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement addReader")
def addWriter(self, writer):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement addWriter")
def removeReader(self, reader):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeReader")
def removeWriter(self, writer):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeWriter")
def removeAll(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeAll")
def getReaders(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement getReaders")
def getWriters(self):
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement getWriters")
# IReactorCore
def resolve(self, name, timeout=(1, 3, 11, 45)):
"""Return a Deferred that will resolve a hostname.
"""
if not name:
# XXX - This is *less than* '::', and will screw up IPv6 servers
return defer.succeed('0.0.0.0')
if abstract.isIPAddress(name):
return defer.succeed(name)
return self.resolver.getHostByName(name, timeout)
def stop(self):
"""
See twisted.internet.interfaces.IReactorCore.stop.
"""
if self._stopped:
raise error.ReactorNotRunning(
"Can't stop reactor that isn't running.")
self._stopped = True
self._justStopped = True
self._startedBefore = True
def crash(self):
"""
See twisted.internet.interfaces.IReactorCore.crash.
Reset reactor state tracking attributes and re-initialize certain
state-transition helpers which were set up in C{__init__} but later
destroyed (through use).
"""
self._started = False
self.running = False
self.addSystemEventTrigger(
'during', 'startup', self._reallyStartRunning)
def sigInt(self, *args):
"""
Handle a SIGINT interrupt.
@param args: See handler specification in L{signal.signal}
"""
log.msg("Received SIGINT, shutting down.")
self.callFromThread(self.stop)
self._exitSignal = args[0]
def sigBreak(self, *args):
"""
Handle a SIGBREAK interrupt.
@param args: See handler specification in L{signal.signal}
"""
log.msg("Received SIGBREAK, shutting down.")
self.callFromThread(self.stop)
self._exitSignal = args[0]
def sigTerm(self, *args):
"""
Handle a SIGTERM interrupt.
@param args: See handler specification in L{signal.signal}
"""
log.msg("Received SIGTERM, shutting down.")
self.callFromThread(self.stop)
self._exitSignal = args[0]
def disconnectAll(self):
"""Disconnect every reader, and writer in the system.
"""
selectables = self.removeAll()
for reader in selectables:
log.callWithLogger(reader,
reader.connectionLost,
failure.Failure(main.CONNECTION_LOST))
def iterate(self, delay=0):
"""See twisted.internet.interfaces.IReactorCore.iterate.
"""
self.runUntilCurrent()
self.doIteration(delay)
def fireSystemEvent(self, eventType):
"""See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
"""
event = self._eventTriggers.get(eventType)
if event is not None:
event.fireEvent()
def addSystemEventTrigger(self, phase: str, eventType: str,
callable: Callable[..., Any], *args, **kw):
"""See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger.
"""
assert builtins.callable(callable), \
"{} is not callable".format(callable)
if eventType not in self._eventTriggers:
self._eventTriggers[eventType] = _ThreePhaseEvent()
return (eventType, self._eventTriggers[eventType].addTrigger(
phase, callable, *args, **kw))
def removeSystemEventTrigger(self, triggerID):
"""See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger.
"""
eventType, handle = triggerID
self._eventTriggers[eventType].removeTrigger(handle)
def callWhenRunning(self, callable: Callable[..., Any], *args, **kw):
"""See twisted.internet.interfaces.IReactorCore.callWhenRunning.
"""
if self.running:
callable(*args, **kw)
else:
return self.addSystemEventTrigger('after', 'startup',
callable, *args, **kw)
def startRunning(self):
"""
Method called when reactor starts: do some initialization and fire
startup events.
Don't call this directly, call reactor.run() instead: it should take
care of calling this.
This method is somewhat misnamed. The reactor will not necessarily be
in the running state by the time this method returns. The only
guarantee is that it will be on its way to the running state.
"""
if self._started:
raise error.ReactorAlreadyRunning()
if self._startedBefore:
raise error.ReactorNotRestartable()
self._started = True
self._stopped = False
if self._registerAsIOThread:
threadable.registerAsIOThread()
self.fireSystemEvent('startup')
def _reallyStartRunning(self):
"""
Method called to transition to the running state. This should happen
in the I{during startup} event trigger phase.
"""
self.running = True
def run(self):
# IReactorCore.run
raise NotImplementedError()
# IReactorTime
seconds = staticmethod(runtimeSeconds)
def callLater(self, delay, callable: Callable[..., Any], *args, **kw):
"""See twisted.internet.interfaces.IReactorTime.callLater.
"""
assert builtins.callable(callable), \
"{} is not callable".format(callable)
assert delay >= 0, \
"{} is not greater than or equal to 0 seconds".format(delay)
tple = DelayedCall(self.seconds() + delay, callable, args, kw,
self._cancelCallLater,
self._moveCallLaterSooner,
seconds=self.seconds)
self._newTimedCalls.append(tple)
return tple
def _moveCallLaterSooner(self, tple):
# Linear time find: slow.
heap = self._pendingTimedCalls
try:
pos = heap.index(tple)
# Move elt up the heap until it rests at the right place.
elt = heap[pos]
while pos != 0:
parent = (pos-1) // 2
if heap[parent] <= elt:
break
# move parent down
heap[pos] = heap[parent]
pos = parent
heap[pos] = elt
except ValueError:
# element was not found in heap - oh well...
pass
def _cancelCallLater(self, tple):
self._cancellations+=1
def getDelayedCalls(self):
"""
Return all the outstanding delayed calls in the system.
They are returned in no particular order.
This method is not efficient -- it is really only meant for
test cases.
@return: A list of outstanding delayed calls.
@type: L{list} of L{DelayedCall}
"""
return [x for x in (self._pendingTimedCalls + self._newTimedCalls) if not x.cancelled]
def _insertNewDelayedCalls(self):
for call in self._newTimedCalls:
if call.cancelled:
self._cancellations-=1
else:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
self._newTimedCalls = []
def timeout(self):
"""
Determine the longest time the reactor may sleep (waiting on I/O
notification, perhaps) before it must wake up to service a time-related
event.
@return: The maximum number of seconds the reactor may sleep.
@rtype: L{float}
"""
# insert new delayed calls to make sure to include them in timeout value
self._insertNewDelayedCalls()
if not self._pendingTimedCalls:
return None
delay = self._pendingTimedCalls[0].time - self.seconds()
# Pick a somewhat arbitrary maximum possible value for the timeout.
# This value is 2 ** 31 / 1000, which is the number of seconds which can
# be represented as an integer number of milliseconds in a signed 32 bit
# integer. This particular limit is imposed by the epoll_wait(3)
# interface which accepts a timeout as a C "int" type and treats it as
# representing a number of milliseconds.
longest = 2147483
# Don't let the delay be in the past (negative) or exceed a plausible
# maximum (platform-imposed) interval.
return max(0, min(longest, delay))
def runUntilCurrent(self):
"""
Run all pending timed calls.
"""
if self.threadCallQueue:
# Keep track of how many calls we actually make, as we're
# making them, in case another call is added to the queue
# while we're in this loop.
count = 0
total = len(self.threadCallQueue)
for (f, a, kw) in self.threadCallQueue:
try:
f(*a, **kw)
except:
log.err()
count += 1
if count == total:
break
del self.threadCallQueue[:count]
if self.threadCallQueue:
self.wakeUp()
# insert new delayed calls now
self._insertNewDelayedCalls()
now = self.seconds()
while self._pendingTimedCalls and (self._pendingTimedCalls[0].time <= now):
call = heappop(self._pendingTimedCalls)
if call.cancelled:
self._cancellations-=1
continue
if call.delayed_time > 0:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
continue
try:
call.called = 1
call.func(*call.args, **call.kw)
except:
log.deferr()
if hasattr(call, "creator"):
e = "\n"
e += " C: previous exception occurred in " + \
"a DelayedCall created here:\n"
e += " C:"
e += "".join(call.creator).rstrip().replace("\n","\n C:")
e += "\n"
log.msg(e)
if (self._cancellations > 50 and
self._cancellations > len(self._pendingTimedCalls) >> 1):
self._cancellations = 0
self._pendingTimedCalls = [x for x in self._pendingTimedCalls
if not x.cancelled]
heapify(self._pendingTimedCalls)
if self._justStopped:
self._justStopped = False
self.fireSystemEvent("shutdown")
# IReactorProcess
def _checkProcessArgs(self, args, env):
"""
Check for valid arguments and environment to spawnProcess.
@return: A two element tuple giving values to use when creating the
process. The first element of the tuple is a C{list} of C{bytes}
giving the values for argv of the child process. The second element
of the tuple is either L{None} if C{env} was L{None} or a C{dict}
mapping C{bytes} environment keys to C{bytes} environment values.
"""
# Any unicode string which Python would successfully implicitly
# encode to a byte string would have worked before these explicit
# checks were added. Anything which would have failed with a
# UnicodeEncodeError during that implicit encoding step would have
# raised an exception in the child process and that would have been
# a pain in the butt to debug.
#
# So, we will explicitly attempt the same encoding which Python
# would implicitly do later. If it fails, we will report an error
# without ever spawning a child process. If it succeeds, we'll save
# the result so that Python doesn't need to do it implicitly later.
#
# -exarkun
# If any of the following environment variables:
# - PYTHONUTF8
# - PYTHONIOENCODING
#
# are set before the Python interpreter runs, they will affect the
# value of sys.stdout.encoding
defaultEncoding = sys.stdout.encoding
# Common check function
def argChecker(arg):
"""
Return either L{bytes} or L{None}. If the given value is not
allowable for some reason, L{None} is returned. Otherwise, a
possibly different object which should be used in place of arg is
returned. This forces unicode encoding to happen now, rather than
implicitly later.
"""
if isinstance(arg, unicode):
try:
arg = arg.encode(defaultEncoding)
except UnicodeEncodeError:
return None
if isinstance(arg, bytes) and b'\0' not in arg:
return arg
return None
# Make a few tests to check input validity
if not isinstance(args, (tuple, list)):
raise TypeError("Arguments must be a tuple or list")
outputArgs = []
for arg in args:
_arg = argChecker(arg)
if _arg is None:
raise TypeError(
"Arguments contain a non-string value: {}".format(arg))
else:
outputArgs.append(_arg)
outputEnv = None
if env is not None:
outputEnv = {}
for key, val in iteritems(env):
_key = argChecker(key)
if _key is None:
raise TypeError(
"Environment contains a "
"non-string key: {}, using encoding: {}".format(
key, sys.stdout.encoding))
_val = argChecker(val)
if _val is None:
raise TypeError(
"Environment contains a "
"non-string value: {}, using encoding {}".format(
val, sys.stdout.encoding))
outputEnv[_key] = _val
return outputArgs, outputEnv
# IReactorThreads
if platform.supportsThreads():
threadpool = None
# ID of the trigger starting the threadpool
_threadpoolStartupID = None
# ID of the trigger stopping the threadpool
threadpoolShutdownID = None
def _initThreads(self):
self.installNameResolver(_GAIResolver(self, self.getThreadPool))
self.usingThreads = True
def callFromThread(self, f, *args, **kw):
"""
See
L{twisted.internet.interfaces.IReactorFromThreads.callFromThread}.
"""
assert callable(f), "%s is not callable" % (f,)
# lists are thread-safe in CPython, but not in Jython
# this is probably a bug in Jython, but until fixed this code
# won't work in Jython.
self.threadCallQueue.append((f, args, kw))
self.wakeUp()
def _initThreadPool(self):
"""
Create the threadpool accessible with callFromThread.
"""
from twisted.python import threadpool
self.threadpool = threadpool.ThreadPool(
0, 10, 'twisted.internet.reactor')
self._threadpoolStartupID = self.callWhenRunning(
self.threadpool.start)
self.threadpoolShutdownID = self.addSystemEventTrigger(
'during', 'shutdown', self._stopThreadPool)
def _uninstallHandler(self):
pass
def _stopThreadPool(self):
"""
Stop the reactor threadpool. This method is only valid if there
is currently a threadpool (created by L{_initThreadPool}). It
is not intended to be called directly; instead, it will be
called by a shutdown trigger created in L{_initThreadPool}.
"""
triggers = [self._threadpoolStartupID, self.threadpoolShutdownID]
for trigger in filter(None, triggers):
try:
self.removeSystemEventTrigger(trigger)
except ValueError:
pass
self._threadpoolStartupID = None
self.threadpoolShutdownID = None
self.threadpool.stop()
self.threadpool = None
def getThreadPool(self):
"""
See L{twisted.internet.interfaces.IReactorThreads.getThreadPool}.
"""
if self.threadpool is None:
self._initThreadPool()
return self.threadpool
def callInThread(self, _callable, *args, **kwargs):
"""
See L{twisted.internet.interfaces.IReactorInThreads.callInThread}.
"""
self.getThreadPool().callInThread(_callable, *args, **kwargs)
def suggestThreadPoolSize(self, size):
"""
See L{twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize}.
"""
self.getThreadPool().adjustPoolsize(maxthreads=size)
else:
# This is for signal handlers.
def callFromThread(self, f, *args, **kw):
assert callable(f), "%s is not callable" % (f,)
# See comment in the other callFromThread implementation.
self.threadCallQueue.append((f, args, kw))
class ReactorBase(PluggableResolverMixin):
"""
Default base class for Reactors.
@ivar _stopped: A flag which is true between paired calls to C{reactor.run}
and C{reactor.stop}. This should be replaced with an explicit state
machine.
@ivar _justStopped: A flag which is true between the time C{reactor.stop}
is called and the time the shutdown system event is fired. This is
used to determine whether that event should be fired after each
iteration through the mainloop. This should be replaced with an
explicit state machine.
@ivar _started: A flag which is true from the time C{reactor.run} is called
until the time C{reactor.run} returns. This is used to prevent calls
to C{reactor.run} on a running reactor. This should be replaced with
an explicit state machine.
@ivar running: See L{IReactorCore.running}
@ivar _registerAsIOThread: A flag controlling whether the reactor will
register the thread it is running in as the I/O thread when it starts.
If C{True}, registration will be done, otherwise it will not be.
@ivar _exitSignal: See L{_ISupportsExitSignalCapturing._exitSignal}
"""
_registerAsIOThread = True
_stopped = True
installed = False
usingThreads = False
_exitSignal = None
__name__ = "twisted.internet.reactor"
def __init__(self) -> None:
super().__init__()
self.threadCallQueue: List[_ThreadCall] = []
self._eventTriggers: Dict[str, _ThreePhaseEvent] = {}
self._pendingTimedCalls: List[DelayedCall] = []
self._newTimedCalls: List[DelayedCall] = []
self._cancellations = 0
self.running = False
self._started = False
self._justStopped = False
self._startedBefore = False
# reactor internal readers, e.g. the waker.
# Using Any as the type here… unable to find a suitable defined interface
self._internalReaders: Set[Any] = set()
self.waker: Any = None
# Arrange for the running attribute to change to True at the right time
# and let a subclass possibly do other things at that time (eg install
# signal handlers).
self.addSystemEventTrigger("during", "startup",
self._reallyStartRunning)
self.addSystemEventTrigger("during", "shutdown", self.crash)
self.addSystemEventTrigger("during", "shutdown", self.disconnectAll)
if platform.supportsThreads():
self._initThreads()
self.installWaker()
# override in subclasses
_lock = None
def installWaker(self) -> None:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement installWaker")
def wakeUp(self) -> None:
"""
Wake up the event loop.
"""
if self.waker:
self.waker.wakeUp()
# if the waker isn't installed, the reactor isn't running, and
# therefore doesn't need to be woken up
def doIteration(self, delay: Optional[float]) -> None:
"""
Do one iteration over the readers and writers which have been added.
"""
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement doIteration")
def addReader(self, reader: IReadDescriptor) -> None:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement addReader")
def addWriter(self, writer: IWriteDescriptor) -> None:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement addWriter")
def removeReader(self, reader: IReadDescriptor) -> None:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeReader")
def removeWriter(self, writer: IWriteDescriptor) -> None:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeWriter")
def removeAll(self) -> List[Union[IReadDescriptor, IWriteDescriptor]]:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement removeAll")
def getReaders(self) -> List[IReadDescriptor]:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement getReaders")
def getWriters(self) -> List[IWriteDescriptor]:
raise NotImplementedError(
reflect.qual(self.__class__) + " did not implement getWriters")
# IReactorCore
def resolve(
self, name: str,
timeout: Sequence[int] = (1, 3, 11, 45)) -> Deferred[str]:
"""
Return a Deferred that will resolve a hostname."""
if not name:
# XXX - This is *less than* '::', and will screw up IPv6 servers
return defer.succeed("0.0.0.0")
if abstract.isIPAddress(name):
return defer.succeed(name)
return self.resolver.getHostByName(name, timeout)
def stop(self) -> None:
"""
See twisted.internet.interfaces.IReactorCore.stop.
"""
if self._stopped:
raise error.ReactorNotRunning(
"Can't stop reactor that isn't running.")
self._stopped = True
self._justStopped = True
self._startedBefore = True
def crash(self) -> None:
"""
See twisted.internet.interfaces.IReactorCore.crash.
Reset reactor state tracking attributes and re-initialize certain
state-transition helpers which were set up in C{__init__} but later
destroyed (through use).
"""
self._started = False
self.running = False
self.addSystemEventTrigger("during", "startup",
self._reallyStartRunning)
def sigInt(self, number: int, frame: Optional[FrameType] = None) -> None:
"""
Handle a SIGINT interrupt.
@param number: See handler specification in L{signal.signal}
@param frame: See handler specification in L{signal.signal}
"""
log.msg("Received SIGINT, shutting down.")
self.callFromThread(self.stop)
self._exitSignal = number
def sigBreak(self, number: int, frame: Optional[FrameType] = None) -> None:
"""
Handle a SIGBREAK interrupt.
@param number: See handler specification in L{signal.signal}
@param frame: See handler specification in L{signal.signal}
"""
log.msg("Received SIGBREAK, shutting down.")
self.callFromThread(self.stop)
self._exitSignal = number
def sigTerm(self, number: int, frame: Optional[FrameType] = None) -> None:
"""
Handle a SIGTERM interrupt.
@param number: See handler specification in L{signal.signal}
@param frame: See handler specification in L{signal.signal}
"""
log.msg("Received SIGTERM, shutting down.")
self.callFromThread(self.stop)
self._exitSignal = number
def disconnectAll(self) -> None:
"""Disconnect every reader, and writer in the system."""
selectables = self.removeAll()
for reader in selectables:
log.callWithLogger(reader, reader.connectionLost,
Failure(main.CONNECTION_LOST))
def iterate(self, delay: float = 0.0) -> None:
"""
See twisted.internet.interfaces.IReactorCore.iterate.
"""
self.runUntilCurrent()
self.doIteration(delay)
def fireSystemEvent(self, eventType: str) -> None:
"""
See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
"""
event = self._eventTriggers.get(eventType)
if event is not None:
event.fireEvent()
def addSystemEventTrigger(
self,
phase: str,
eventType: str,
callable: Callable[..., Any],
*args: object,
**kwargs: object,
) -> _SystemEventID:
"""
See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger.
"""
assert builtins.callable(callable), f"{callable} is not callable"
if eventType not in self._eventTriggers:
self._eventTriggers[eventType] = _ThreePhaseEvent()
return _SystemEventID((
eventType,
self._eventTriggers[eventType].addTrigger(phase, callable, *args,
**kwargs),
))
def removeSystemEventTrigger(self, triggerID: _SystemEventID) -> None:
"""
See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger.
"""
eventType, handle = triggerID
self._eventTriggers[eventType].removeTrigger(handle)
def callWhenRunning(self, callable: Callable[..., Any], *args: object,
**kwargs: object) -> Optional[_SystemEventID]:
"""
See twisted.internet.interfaces.IReactorCore.callWhenRunning.
"""
if self.running:
callable(*args, **kwargs)
return None
else:
return self.addSystemEventTrigger("after", "startup", callable,
*args, **kwargs)
def startRunning(self) -> None:
"""
Method called when reactor starts: do some initialization and fire
startup events.
Don't call this directly, call reactor.run() instead: it should take
care of calling this.
This method is somewhat misnamed. The reactor will not necessarily be
in the running state by the time this method returns. The only
guarantee is that it will be on its way to the running state.
"""
if self._started:
raise error.ReactorAlreadyRunning()
if self._startedBefore:
raise error.ReactorNotRestartable()
self._started = True
self._stopped = False
if self._registerAsIOThread:
threadable.registerAsIOThread()
self.fireSystemEvent("startup")
def _reallyStartRunning(self) -> None:
"""
Method called to transition to the running state. This should happen
in the I{during startup} event trigger phase.
"""
self.running = True
def run(self) -> None:
# IReactorCore.run
raise NotImplementedError()
# IReactorTime
seconds = staticmethod(runtimeSeconds)
def callLater(self, delay: float, callable: Callable[..., Any],
*args: object, **kw: object) -> DelayedCall:
"""
See twisted.internet.interfaces.IReactorTime.callLater.
"""
assert builtins.callable(callable), f"{callable} is not callable"
assert delay >= 0, f"{delay} is not greater than or equal to 0 seconds"
delayedCall = DelayedCall(
self.seconds() + delay,
callable,
args,
kw,
self._cancelCallLater,
self._moveCallLaterSooner,
seconds=self.seconds,
)
self._newTimedCalls.append(delayedCall)
return delayedCall
def _moveCallLaterSooner(self, delayedCall: DelayedCall) -> None:
# Linear time find: slow.
heap = self._pendingTimedCalls
try:
pos = heap.index(delayedCall)
# Move elt up the heap until it rests at the right place.
elt = heap[pos]
while pos != 0:
parent = (pos - 1) // 2
if heap[parent] <= elt:
break
# move parent down
heap[pos] = heap[parent]
pos = parent
heap[pos] = elt
except ValueError:
# element was not found in heap - oh well...
pass
def _cancelCallLater(self, delayedCall: DelayedCall) -> None:
self._cancellations += 1
def getDelayedCalls(self) -> Sequence[IDelayedCall]:
"""
See L{twisted.internet.interfaces.IReactorTime.getDelayedCalls}
"""
return [
x for x in (self._pendingTimedCalls + self._newTimedCalls)
if not x.cancelled
]
def _insertNewDelayedCalls(self) -> None:
for call in self._newTimedCalls:
if call.cancelled:
self._cancellations -= 1
else:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
self._newTimedCalls = []
def timeout(self) -> Optional[float]:
"""
Determine the longest time the reactor may sleep (waiting on I/O
notification, perhaps) before it must wake up to service a time-related
event.
@return: The maximum number of seconds the reactor may sleep.
"""
# insert new delayed calls to make sure to include them in timeout value
self._insertNewDelayedCalls()
if not self._pendingTimedCalls:
return None
delay = self._pendingTimedCalls[0].time - cast(float, self.seconds())
# Pick a somewhat arbitrary maximum possible value for the timeout.
# This value is 2 ** 31 / 1000, which is the number of seconds which can
# be represented as an integer number of milliseconds in a signed 32 bit
# integer. This particular limit is imposed by the epoll_wait(3)
# interface which accepts a timeout as a C "int" type and treats it as
# representing a number of milliseconds.
longest = 2147483
# Don't let the delay be in the past (negative) or exceed a plausible
# maximum (platform-imposed) interval.
return max(0, min(longest, delay))
def runUntilCurrent(self) -> None:
"""
Run all pending timed calls.
"""
if self.threadCallQueue:
# Keep track of how many calls we actually make, as we're
# making them, in case another call is added to the queue
# while we're in this loop.
count = 0
total = len(self.threadCallQueue)
for (f, a, kw) in self.threadCallQueue:
try:
f(*a, **kw)
except BaseException:
log.err()
count += 1
if count == total:
break
del self.threadCallQueue[:count]
if self.threadCallQueue:
self.wakeUp()
# insert new delayed calls now
self._insertNewDelayedCalls()
now = self.seconds()
while self._pendingTimedCalls and (self._pendingTimedCalls[0].time <=
now):
call = heappop(self._pendingTimedCalls)
if call.cancelled:
self._cancellations -= 1
continue
if call.delayed_time > 0.0:
call.activate_delay()
heappush(self._pendingTimedCalls, call)
continue
try:
call.called = 1
call.func(*call.args, **call.kw)
except BaseException:
log.deferr()
if hasattr(call, "creator"):
e = "\n"
e += (" C: previous exception occurred in " +
"a DelayedCall created here:\n")
e += " C:"
e += "".join(call.creator).rstrip().replace("\n", "\n C:")
e += "\n"
log.msg(e)
if (self._cancellations > 50
and self._cancellations > len(self._pendingTimedCalls) >> 1):
self._cancellations = 0
self._pendingTimedCalls = [
x for x in self._pendingTimedCalls if not x.cancelled
]
heapify(self._pendingTimedCalls)
if self._justStopped:
self._justStopped = False
self.fireSystemEvent("shutdown")
# IReactorThreads
if platform.supportsThreads():
assert ThreadPool is not None
threadpool = None
# ID of the trigger starting the threadpool
_threadpoolStartupID = None
# ID of the trigger stopping the threadpool
threadpoolShutdownID = None
def _initThreads(self) -> None:
self.installNameResolver(_GAIResolver(self, self.getThreadPool))
self.usingThreads = True
# `IReactorFromThreads` defines the first named argument as
# `callable: Callable[..., Any]` but this defines it as `f`
# really both should be defined using py3.8 positional only
def callFromThread( # type: ignore[override]
self, f: Callable[..., Any], *args: object,
**kwargs: object) -> None:
"""
See
L{twisted.internet.interfaces.IReactorFromThreads.callFromThread}.
"""
assert callable(f), f"{f} is not callable"
# lists are thread-safe in CPython, but not in Jython
# this is probably a bug in Jython, but until fixed this code
# won't work in Jython.
self.threadCallQueue.append((f, args, kwargs))
self.wakeUp()
def _initThreadPool(self) -> None:
"""
Create the threadpool accessible with callFromThread.
"""
self.threadpool = ThreadPool(0, 10, "twisted.internet.reactor")
self._threadpoolStartupID = self.callWhenRunning(
self.threadpool.start)
self.threadpoolShutdownID = self.addSystemEventTrigger(
"during", "shutdown", self._stopThreadPool)
def _uninstallHandler(self) -> None:
pass
def _stopThreadPool(self) -> None:
"""
Stop the reactor threadpool. This method is only valid if there
is currently a threadpool (created by L{_initThreadPool}). It
is not intended to be called directly; instead, it will be
called by a shutdown trigger created in L{_initThreadPool}.
"""
triggers = [self._threadpoolStartupID, self.threadpoolShutdownID]
for trigger in filter(None, triggers):
try:
self.removeSystemEventTrigger(trigger)
except ValueError:
pass
self._threadpoolStartupID = None
self.threadpoolShutdownID = None
assert self.threadpool is not None
self.threadpool.stop()
self.threadpool = None
def getThreadPool(self) -> ThreadPool:
"""
See L{twisted.internet.interfaces.IReactorThreads.getThreadPool}.
"""
if self.threadpool is None:
self._initThreadPool()
assert self.threadpool is not None
return self.threadpool
# `IReactorInThreads` defines the first named argument as
# `callable: Callable[..., Any]` but this defines it as `_callable`
# really both should be defined using py3.8 positional only
def callInThread( # type: ignore[override]
self, _callable: Callable[..., Any], *args: object,
**kwargs: object) -> None:
"""
See L{twisted.internet.interfaces.IReactorInThreads.callInThread}.
"""
self.getThreadPool().callInThread(_callable, *args, **kwargs)
def suggestThreadPoolSize(self, size: int) -> None:
"""
See L{twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize}.
"""
self.getThreadPool().adjustPoolsize(maxthreads=size)
else:
# This is for signal handlers.
def callFromThread(self, f: Callable[..., Any], *args: object,
**kwargs: object) -> None:
assert callable(f), f"{f} is not callable"
# See comment in the other callFromThread implementation.
self.threadCallQueue.append((f, args, kwargs))