"""Undocumented Module"""
__all__ = ['Messenger']
from PythonUtil import *
from direct.directnotify import DirectNotifyGlobal
import types
from panda3d.core import ConfigVariableBool
# If using the Toontown ActiveX launcher, this must be set true.
# Also, Panda must be compiled with SIMPLE_THREADS or no HAVE_THREADS
# at all. In the normal Panda case, this should be set false.
if ConfigVariableBool('delay-messenger-lock', False).getValue():
class Lock:
""" This is a cheesy delayed implementation of Lock, designed to
support the Toontown ActiveX launch, which must import Messenger
before it has downloaded the rest of Panda. Note that this
cheesy lock isn't thread-safe if the application starts any
threads before acquiring the Messenger lock the first time.
(However, it's mostly thread-safe if Panda is compiled with
SIMPLE_THREADS.) """
notify = DirectNotifyGlobal.directNotify.newCategory("Messenger.Lock")
def __init__(self):
self.locked = 0
def acquire(self):
# Before we download Panda, we can't use any threading
# interfaces. So don't, until we observe that we have some
# actual contention on the lock.
if self.locked:
# We have contention.
return self.__getLock()
# This relies on the fact that any individual Python statement
# is atomic.
self.locked += 1
if self.locked > 1:
# Whoops, we have contention.
self.locked -= 1
return self.__getLock()
def release(self):
if self.locked:
# Still using the old, cheesy lock.
self.locked -= 1
return
# The new lock must have been put in place.
self.release = self.lock.release
return self.lock.release()
def __getLock(self):
# Now that we've started Panda, it's safe to import the Mutex
# class, which becomes our actual lock.
# From now on, this lock will be used.
self.notify.info("Acquiring Panda lock for the first time.")
from pandac.PandaModules import Thread, Mutex
self.__dict__.setdefault('lock', Mutex('Messenger'))
self.lock.acquire()
self.acquire = self.lock.acquire
# Wait for the cheesy lock to be released before we return.
self.notify.info("Waiting for cheesy lock to be released.")
while self.locked:
Thread.forceYield()
self.notify.info("Got cheesy lock.")
# We return with the lock acquired.
else:
# In the normal case, there's no reason not to import all of
# libpanda right away, and so we can just use Lock directly. This
# is perfectly thread-safe.
from direct.stdpy.threading import Lock
class Messenger:
notify = DirectNotifyGlobal.directNotify.newCategory("Messenger")
def __init__(self):
"""
One is keyed off the event name. It has the following structure:
{event1: {object1: [method, extraArgs, persistent],
object2: [method, extraArgs, persistent]},
event2: {object1: [method, extraArgs, persistent],
object2: [method, extraArgs, persistent]}}
This dictionary allow for efficient callbacks when the messenger
hears an event.
A second dictionary remembers which objects are accepting which
events. This allows for efficient ignoreAll commands.
Or, for an example with more real data:
{'mouseDown': {avatar: [avatar.jump, [2.0], 1]}}
"""
# eventName->objMsgrId->callbackInfo
self.__callbacks = {}
# objMsgrId->set(eventName)
self.__objectEvents = {}
self._messengerIdGen = 0
# objMsgrId->listenerObject
self._id2object = {}
# A mapping of taskChain -> eventList, used for sending events
# across task chains (and therefore across threads).
self._eventQueuesByTaskChain = {}
# This protects the data structures within this object from
# multithreaded access.
self.lock = Lock()
if __debug__:
self.__isWatching=0
self.__watching={}
# I'd like this to be in the __debug__, but I fear that someone will
# want this in a release build. If you're sure that that will not be
# then please remove this comment and put the quiet/verbose stuff
# under __debug__.
self.quieting={"NewFrame":1,
"avatarMoving":1,
"event-loop-done":1,
'collisionLoopFinished':1,
} # see def quiet()
def _getMessengerId(self, object):
# TODO: allocate this id in DirectObject.__init__ and get derived
# classes to call down (speed optimization, assuming objects
# accept/ignore more than once over their lifetime)
# get unique messenger id for this object
# assumes lock is held.
if not hasattr(object, '_MSGRmessengerId'):
object._MSGRmessengerId = (object.__class__.__name__, self._messengerIdGen)
self._messengerIdGen += 1
return object._MSGRmessengerId
def _storeObject(self, object):
# store reference-counted reference to object in case we need to
# retrieve it later. assumes lock is held.
id = self._getMessengerId(object)
if id not in self._id2object:
self._id2object[id] = [1, object]
else:
self._id2object[id][0] += 1
def _getObject(self, id):
return self._id2object[id][1]
def _getObjects(self):
self.lock.acquire()
try:
objs = []
for refCount, obj in self._id2object.itervalues():
objs.append(obj)
return objs
finally:
self.lock.release()
def _getNumListeners(self, event):
return len(self.__callbacks.get(event, {}))
def _getEvents(self):
return self.__callbacks.keys()
def _releaseObject(self, object):
# assumes lock is held.
id = self._getMessengerId(object)
if id in self._id2object:
record = self._id2object[id]
record[0] -= 1
if record[0] <= 0:
del self._id2object[id]
def accept(self, event, object, method, extraArgs=[], persistent=1):
""" accept(self, string, DirectObject, Function, List, Boolean)
Make this object accept this event. When the event is
sent (using Messenger.send or from C++), method will be executed,
optionally passing in extraArgs.
If the persistent flag is set, it will continue to respond
to this event, otherwise it will respond only once.
"""
notifyDebug = Messenger.notify.getDebug()
if notifyDebug:
Messenger.notify.debug(
"object: %s (%s)\n accepting: %s\n method: %s\n extraArgs: %s\n persistent: %s" %
(safeRepr(object), self._getMessengerId(object), event, safeRepr(method),
safeRepr(extraArgs), persistent))
# Make sure that the method is callable
assert hasattr(method, '__call__'), (
"method not callable in accept (ignoring): %s %s"%
(safeRepr(method), safeRepr(extraArgs)))
# Make sure extraArgs is a list or tuple
if not (isinstance(extraArgs, list) or isinstance(extraArgs, tuple) or isinstance(extraArgs, set)):
raise TypeError, "A list is required as extraArgs argument"
self.lock.acquire()
try:
acceptorDict = self.__callbacks.setdefault(event, {})
id = self._getMessengerId(object)
# Make sure we are not inadvertently overwriting an existing event
# on this particular object.
if id in acceptorDict:
# TODO: we're replacing the existing callback. should this be an error?
if notifyDebug:
oldMethod = acceptorDict[id][0]
if oldMethod == method:
self.notify.warning(
"object: %s was already accepting: \"%s\" with same callback: %s()" %
(object.__class__.__name__, safeRepr(event), method.__name__))
else:
self.notify.warning(
"object: %s accept: \"%s\" new callback: %s() supplanting old callback: %s()" %
(object.__class__.__name__, safeRepr(event), method.__name__, oldMethod.__name__))
acceptorDict[id] = [method, extraArgs, persistent]
# Remember that this object is listening for this event
eventDict = self.__objectEvents.setdefault(id, {})
if event not in eventDict:
self._storeObject(object)
eventDict[event] = None
finally:
self.lock.release()
def ignore(self, event, object):
""" ignore(self, string, DirectObject)
Make this object no longer respond to this event.
It is safe to call even if it was not already accepting
"""
if Messenger.notify.getDebug():
Messenger.notify.debug(
safeRepr(object) + ' (%s)\n now ignoring: ' % (self._getMessengerId(object), ) + safeRepr(event))
self.lock.acquire()
try:
id = self._getMessengerId(object)
# Find the dictionary of all the objects accepting this event
acceptorDict = self.__callbacks.get(event)
# If this object is there, delete it from the dictionary
if acceptorDict and id in acceptorDict:
del acceptorDict[id]
# If this dictionary is now empty, remove the event
# entry from the Messenger alltogether
if (len(acceptorDict) == 0):
del self.__callbacks[event]
# This object is no longer listening for this event
eventDict = self.__objectEvents.get(id)
if eventDict and event in eventDict:
del eventDict[event]
if (len(eventDict) == 0):
del self.__objectEvents[id]
self._releaseObject(object)
finally:
self.lock.release()
def ignoreAll(self, object):
"""
Make this object no longer respond to any events it was accepting
Useful for cleanup
"""
if Messenger.notify.getDebug():
Messenger.notify.debug(
safeRepr(object) + ' (%s)\n now ignoring all events' % (self._getMessengerId(object), ))
self.lock.acquire()
try:
id = self._getMessengerId(object)
# Get the list of events this object is listening to
eventDict = self.__objectEvents.get(id)
if eventDict:
for event in eventDict.keys():
# Find the dictionary of all the objects accepting this event
acceptorDict = self.__callbacks.get(event)
# If this object is there, delete it from the dictionary
if acceptorDict and id in acceptorDict:
del acceptorDict[id]
# If this dictionary is now empty, remove the event
# entry from the Messenger alltogether
if (len(acceptorDict) == 0):
del self.__callbacks[event]
self._releaseObject(object)
del self.__objectEvents[id]
finally:
self.lock.release()
def getAllAccepting(self, object):
"""
Returns the list of all events accepted by the indicated object.
"""
self.lock.acquire()
try:
id = self._getMessengerId(object)
# Get the list of events this object is listening to
eventDict = self.__objectEvents.get(id)
if eventDict:
return eventDict.keys()
return []
finally:
self.lock.release()
def isAccepting(self, event, object):
""" isAccepting(self, string, DirectOject)
Is this object accepting this event?
"""
self.lock.acquire()
try:
acceptorDict = self.__callbacks.get(event)
id = self._getMessengerId(object)
if acceptorDict and id in acceptorDict:
# Found it, return true
return 1
# If we looked in both dictionaries and made it here
# that object must not be accepting that event.
return 0
finally:
self.lock.release()
def whoAccepts(self, event):
"""
Return objects accepting the given event
"""
return self.__callbacks.get(event)
def isIgnoring(self, event, object):
""" isIgnorning(self, string, DirectObject)
Is this object ignoring this event?
"""
return (not self.isAccepting(event, object))
def send(self, event, sentArgs=[], taskChain = None):
"""
Send this event, optionally passing in arguments
event is usually a string.
sentArgs is a list of any data that you want passed along to the
handlers listening to this event.
If taskChain is not None, it is the name of the task chain
which should receive the event. If taskChain is None, the
event is handled immediately. Setting a non-None taskChain
will defer the event (possibly till next frame or even later)
and create a new, temporary task within the named taskChain,
but this is the only way to send an event across threads.
"""
if Messenger.notify.getDebug() and not self.quieting.get(event):
assert Messenger.notify.debug(
'sent event: %s sentArgs = %s, taskChain = %s' % (
event, sentArgs, taskChain))
self.lock.acquire()
try:
foundWatch=0
if __debug__:
if self.__isWatching:
for i in self.__watching.keys():
if str(event).find(i) >= 0:
foundWatch=1
break
acceptorDict = self.__callbacks.get(event)
if not acceptorDict:
if __debug__:
if foundWatch:
print "Messenger: \"%s\" was sent, but no function in Python listened."%(event,)
return
if taskChain:
# Queue the event onto the indicated task chain.
from direct.task.TaskManagerGlobal import taskMgr
queue = self._eventQueuesByTaskChain.setdefault(taskChain, [])
queue.append((acceptorDict, event, sentArgs, foundWatch))
if len(queue) == 1:
# If this is the first (only) item on the queue,
# spawn the task to empty it.
taskMgr.add(self.__taskChainDispatch, name = 'Messenger-%s' % (taskChain),
extraArgs = [taskChain], taskChain = taskChain,
appendTask = True)
else:
# Handle the event immediately.
self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
finally:
self.lock.release()
def __taskChainDispatch(self, taskChain, task):
""" This task is spawned each time an event is sent across
task chains. Its job is to empty the task events on the queue
for this particular task chain. This guarantees that events
are still delivered in the same order they were sent. """
while True:
eventTuple = None
self.lock.acquire()
try:
queue = self._eventQueuesByTaskChain.get(taskChain, None)
if queue:
eventTuple = queue[0]
del queue[0]
if not queue:
# The queue is empty, we're done.
if queue is not None:
del self._eventQueuesByTaskChain[taskChain]
if not eventTuple:
# No event; we're done.
return task.done
self.__dispatch(*eventTuple)
finally:
self.lock.release()
return task.done
def __dispatch(self, acceptorDict, event, sentArgs, foundWatch):
for id in acceptorDict.keys():
# We have to make this apparently redundant check, because
# it is possible that one object removes its own hooks
# in response to a handler called by a previous object.
#
# NOTE: there is no danger of skipping over objects due to
# modifications to acceptorDict, since the for..in above
# iterates over a list of objects that is created once at
# the start
callInfo = acceptorDict.get(id)
if callInfo:
method, extraArgs, persistent = callInfo
# If this object was only accepting this event once,
# remove it from the dictionary
if not persistent:
# This object is no longer listening for this event
eventDict = self.__objectEvents.get(id)
if eventDict and event in eventDict:
del eventDict[event]
if (len(eventDict) == 0):
del self.__objectEvents[id]
self._releaseObject(self._getObject(id))
del acceptorDict[id]
# If the dictionary at this event is now empty, remove
# the event entry from the Messenger altogether
if (event in self.__callbacks \
and (len(self.__callbacks[event]) == 0)):
del self.__callbacks[event]
if __debug__:
if foundWatch:
print "Messenger: \"%s\" --> %s%s"%(
event,
self.__methodRepr(method),
tuple(extraArgs + sentArgs))
#print "Messenger: \"%s\" --> %s%s"%(
# event,
# self.__methodRepr(method),
# tuple(extraArgs + sentArgs))
# It is important to make the actual call here, after
# we have cleaned up the accept hook, because the
# method itself might call accept() or acceptOnce()
# again.
assert hasattr(method, '__call__')
# Release the lock temporarily while we call the method.
self.lock.release()
try:
method (*(extraArgs + sentArgs))
finally:
self.lock.acquire()
def clear(self):
"""
Start fresh with a clear dict
"""
self.lock.acquire()
try:
self.__callbacks.clear()
self.__objectEvents.clear()
self._id2object.clear()
finally:
self.lock.release()
def isEmpty(self):
return (len(self.__callbacks) == 0)
def getEvents(self):
return self.__callbacks.keys()
def replaceMethod(self, oldMethod, newFunction):
"""
This is only used by Finder.py - the module that lets
you redefine functions with Control-c-Control-v
"""
retFlag = 0
for entry in self.__callbacks.items():
event, objectDict = entry
for objectEntry in objectDict.items():
object, params = objectEntry
method = params[0]
if (type(method) == types.MethodType):
function = method.im_func
else:
function = method
#print ('function: ' + repr(function) + '\n' +
# 'method: ' + repr(method) + '\n' +
# 'oldMethod: ' + repr(oldMethod) + '\n' +
# 'newFunction: ' + repr(newFunction) + '\n')
if (function == oldMethod):
newMethod = types.MethodType(
newFunction, method.im_self, method.im_class)
params[0] = newMethod
# Found it retrun true
retFlag += 1
# didn't find that method, return false
return retFlag
def toggleVerbose(self):
isVerbose = 1 - Messenger.notify.getDebug()
Messenger.notify.setDebug(isVerbose)
if isVerbose:
print "Verbose mode true. quiet list = %s"%(
self.quieting.keys(),)
if __debug__:
def watch(self, needle):
"""
return a matching event (needle) if found (in haystack).
This is primarily a debugging tool.
This is intended for debugging use only.
This function is not defined if python is ran with -O (optimize).
See Also: unwatch
"""
if not self.__watching.get(needle):
self.__isWatching += 1
self.__watching[needle]=1
def unwatch(self, needle):
"""
return a matching event (needle) if found (in haystack).
This is primarily a debugging tool.
This is intended for debugging use only.
This function is not defined if python is ran with -O (optimize).
See Also: watch
"""
if self.__watching.get(needle):
self.__isWatching -= 1
del self.__watching[needle]
def quiet(self, message):
"""
When verbose mode is on, don't spam the output with messages
marked as quiet.
This is primarily a debugging tool.
This is intended for debugging use only.
This function is not defined if python is ran with -O (optimize).
See Also: unquiet
"""
if not self.quieting.get(message):
self.quieting[message]=1
def unquiet(self, message):
"""
Remove a message from the list of messages that are not reported
in verbose mode.
This is primarily a debugging tool.
This is intended for debugging use only.
This function is not defined if python is ran with -O (optimize).
See Also: quiet
"""
if self.quieting.get(message):
del self.quieting[message]
def find(self, needle):
"""
return a matching event (needle) if found (in haystack).
This is primarily a debugging tool.
"""
keys = self.__callbacks.keys()
keys.sort()
for event in keys:
if repr(event).find(needle) >= 0:
print self.__eventRepr(event),
return {event: self.__callbacks[event]}
def findAll(self, needle, limit=None):
"""
return a dict of events (needle) if found (in haystack).
limit may be None or an integer (e.g. 1).
This is primarily a debugging tool.
"""
matches = {}
keys = self.__callbacks.keys()
keys.sort()
for event in keys:
if repr(event).find(needle) >= 0:
print self.__eventRepr(event),
matches[event] = self.__callbacks[event]
# if the limit is not None, decrement and
# check for break:
if limit > 0:
limit -= 1
if limit == 0:
break
return matches
def __methodRepr(self, method):
"""
return string version of class.method or method.
"""
if (type(method) == types.MethodType):
functionName = method.im_class.__name__ + '.' + \
method.im_func.__name__
else:
if hasattr(method, "__name__"):
functionName = method.__name__
else:
return ""
return functionName
def __eventRepr(self, event):
"""
Compact version of event, acceptor pairs
"""
str = event.ljust(32) + '\t'
acceptorDict = self.__callbacks[event]
for key, (method, extraArgs, persistent) in acceptorDict.items():
str = str + self.__methodRepr(method) + ' '
str = str + '\n'
return str
def __repr__(self):
"""
Compact version of event, acceptor pairs
"""
str = "The messenger is currently handling:\n" + "="*64 + "\n"
keys = self.__callbacks.keys()
keys.sort()
for event in keys:
str += self.__eventRepr(event)
# Print out the object: event dictionary too
str += "="*64 + "\n"
for key, eventDict in self.__objectEvents.items():
object = self._getObject(key)
str += "%s:\n" % repr(object)
for event in eventDict.keys():
str += " %s\n" % repr(event)
str += "="*64 + "\n" + "End of messenger info.\n"
return str
def detailedRepr(self):
"""
Print out the table in a detailed readable format
"""
import types
str = 'Messenger\n'
str = str + '='*50 + '\n'
keys = self.__callbacks.keys()
keys.sort()
for event in keys:
acceptorDict = self.__callbacks[event]
str = str + 'Event: ' + event + '\n'
for key in acceptorDict.keys():
function, extraArgs, persistent = acceptorDict[key]
object = self._getObject(key)
if (type(object) == types.InstanceType):
className = object.__class__.__name__
else:
className = "Not a class"
functionName = function.__name__
str = (str + '\t' +
'Acceptor: ' + className + ' instance' + '\n\t' +
'Function name:' + functionName + '\n\t' +
'Extra Args: ' + repr(extraArgs) + '\n\t' +
'Persistent: ' + repr(persistent) + '\n')
# If this is a class method, get its actual function
if (type(function) == types.MethodType):
str = (str + '\t' +
'Method: ' + repr(function) + '\n\t' +
'Function: ' + repr(function.im_func) + '\n')
else:
str = (str + '\t' +
'Function: ' + repr(function) + '\n')
str = str + '='*50 + '\n'
return str