Source code for direct.distributed.AsyncRequest

#from otp.ai.AIBaseGlobal import *
from direct.directnotify import DirectNotifyGlobal
from direct.showbase.DirectObject import DirectObject
from .ConnectionRepository import *
from panda3d.core import ConfigVariableDouble, ConfigVariableInt, ConfigVariableBool

ASYNC_REQUEST_DEFAULT_TIMEOUT_IN_SECONDS = 8.0
ASYNC_REQUEST_INFINITE_RETRIES = -1
ASYNC_REQUEST_DEFAULT_NUM_RETRIES = 0

if __debug__:
    _overrideTimeoutTimeForAllAsyncRequests = ConfigVariableDouble("async-request-timeout", -1.0)
    _overrideNumRetriesForAllAsyncRequests = ConfigVariableInt("async-request-num-retries", -1)
    _breakOnTimeout = ConfigVariableBool("async-request-break-on-timeout", False)

[docs]class AsyncRequest(DirectObject): """ This class is used to make asynchronous reads and creates to a database. You can create a list of self.neededObjects and then ask for each to be read or created, or if you only have one object that you need you can skip the self.neededObjects because calling askForObject or createObject will set the self.neededObjects value for you. Once all the objects have been read or created, the self.finish() method will be called. You may override this function to run your code in a derived class. If you wish to queue up several items that you all need before the finish method is called, you can put items in self.neededObjects and then call askForObject or createObject afterwards. That way the _checkCompletion will not call finish until after all the requests have been done. If you need to chain serveral object reads or creates, just add more entries to the self.neededObjects dictionary in the self.finish function and return without calling AsyncRequest.finish(). Your finish method will be called again when the new self.neededObjects is complete. You may repeat this as necessary. """ _asyncRequests = {} notify = DirectNotifyGlobal.directNotify.newCategory('AsyncRequest')
[docs] def __init__(self, air, replyToChannelId = None, timeoutTime = ASYNC_REQUEST_DEFAULT_TIMEOUT_IN_SECONDS, numRetries = ASYNC_REQUEST_DEFAULT_NUM_RETRIES): """ air is the AI Respository. replyToChannelId may be an avatarId, an accountId, or a channelId. timeoutTime is how many seconds to wait before aborting the request. numRetries is the number of times to retry the request before giving up. """ assert AsyncRequest.notify.debugCall() if __debug__: if _overrideTimeoutTimeForAllAsyncRequests.getValue() >= 0.0: timeoutTime = _overrideTimeoutTimeForAllAsyncRequests.getValue() if _overrideNumRetriesForAllAsyncRequests.getValue() >= 0: numRetries = _overrideNumRetriesForAllAsyncRequests.getValue() AsyncRequest._asyncRequests[id(self)] = self self.deletingMessage = "AsyncRequest-deleting-%s"%(id(self,)) self.air = air self.replyToChannelId = replyToChannelId self.timeoutTask = None self.neededObjects = {} self._timeoutTime = timeoutTime self._initialNumRetries = numRetries
[docs] def delete(self): assert AsyncRequest.notify.debugCall() del AsyncRequest._asyncRequests[id(self)] self.ignoreAll() self._resetTimeoutTask(False) messenger.send(self.deletingMessage, []) del self.neededObjects del self.air del self.replyToChannelId
[docs] def askForObjectField( self, dclassName, fieldName, doId, key = None, context = None): """ Request an already created object, i.e. read from database. """ assert AsyncRequest.notify.debugCall() if key is None: # default the dictionary key to the fieldName key = fieldName assert doId if context is None: context = self.air.allocateContext() self.air.contextToClassName[context] = dclassName self.acceptOnce( "doFieldResponse-%s"%(context,), self._checkCompletion, [key]) self.neededObjects[key] = None self.air.queryObjectField(dclassName, fieldName, doId, context) self._resetTimeoutTask()
[docs] def askForObjectFields( self, dclassName, fieldNames, doId, key = None, context = None): """ Request an already created object, i.e. read from database. """ assert AsyncRequest.notify.debugCall() if key is None: # default the dictionary key to the fieldName key = fieldNames[0] assert doId if context is None: context = self.air.allocateContext() self.air.contextToClassName[context] = dclassName self.acceptOnce( "doFieldResponse-%s"%(context,), self._checkCompletion, [key]) self.air.queryObjectFields(dclassName, fieldNames, doId, context) self._resetTimeoutTask()
[docs] def askForObjectFieldsByString(self, dbId, dclassName, objString, fieldNames, key=None, context=None): assert AsyncRequest.notify.debugCall() assert dbId if key is None: # default the dictionary key to the fieldNames key = fieldNames if context is None: context=self.air.allocateContext() self.air.contextToClassName[context]=dclassName self.acceptOnce( "doFieldResponse-%s"%(context,), self._checkCompletion, [key]) self.air.queryObjectStringFields(dbId,dclassName,objString,fieldNames,context) self._resetTimeoutTask()
[docs] def askForObject(self, doId, context = None): """ Request an already created object, i.e. read from database. """ assert AsyncRequest.notify.debugCall() assert doId if context is None: context = self.air.allocateContext() self.acceptOnce( "doRequestResponse-%s"%(context,), self._checkCompletion, [None]) self.air.queryObjectAll(doId, context) self._resetTimeoutTask()
[docs] def createObject(self, name, className, databaseId = None, values = None, context = None): """ Create a new database object. You can get the doId from within your self.finish() function. This functions is different from createObjectId in that it does generate the object when the response comes back. The object is added to the doId2do and so forth and treated as a full regular object (which it is). This is useful on the AI where we really do want the object on the AI. """ assert AsyncRequest.notify.debugCall() assert name assert className self.neededObjects[name] = None if context is None: context = self.air.allocateContext() self.accept( self.air.getDatabaseGenerateResponseEvent(context), self._doCreateObject, [name, className, values]) self.air.requestDatabaseGenerate( className, context, databaseId = databaseId, values = values) self._resetTimeoutTask()
[docs] def createObjectId(self, name, className, values = None, context = None): """ Create a new database object. You can get the doId from within your self.finish() function. This functions is different from createObject in that it does not generate the object when the response comes back. It only tells you the doId. This is useful on the UD where we don't really want the object on the UD, we just want the object created and the UD wants to send messages to it using the ID. """ assert AsyncRequest.notify.debugCall() assert name assert className self.neededObjects[name] = None if context is None: context = self.air.allocateContext() self.accept( self.air.getDatabaseGenerateResponseEvent(context), self._checkCompletion, [name, None]) self.air.requestDatabaseGenerate(className, context, values = values) self._resetTimeoutTask()
[docs] def finish(self): """ This is the function that gets called when all of the needed objects are in (i.e. all the askForObject and createObject requests have been satisfied). If the other requests timeout, finish will not be called. """ assert self.notify.debugCall() self.delete()
def _doCreateObject(self, name, className, values, doId): isInDoId2do = doId in self.air.doId2do distObj = self.air.generateGlobalObject(doId, className, values) if not isInDoId2do and game.name == 'uberDog': # only remove doId if this is the uberdog?, in pirates this was # causing traded inventory objects to be generated twice, once # here and again later when it was noticed the doId was not in # the doId2do list yet. self.air.doId2do.pop(doId, None) self._checkCompletion(name, None, distObj) def _checkCompletion(self, name, context, distObj): """ This checks whether we have all the needed objects and calls finish() if we do. """ if name is not None: self.neededObjects[name] = distObj else: self.neededObjects[distObj.doId] = distObj for i in self.neededObjects.values(): if i is None: return self.finish() def _resetTimeoutTask(self, createAnew = True): if self.timeoutTask: taskMgr.remove(self.timeoutTask) self.timeoutTask = None if createAnew: self.numRetries = self._initialNumRetries self.timeoutTask = taskMgr.doMethodLater( self._timeoutTime, self.timeout, "AsyncRequestTimer-%s"%(id(self,)))
[docs] def timeout(self, task): assert AsyncRequest.notify.debugCall( "neededObjects: %s"%(self.neededObjects,)) if self.numRetries > 0: assert AsyncRequest.notify.debug( 'Timed out. Trying %d more time(s) : %s' % (self.numRetries + 1, repr(self.neededObjects))) self.numRetries -= 1 return Task.again else: if __debug__: if _breakOnTimeout: if hasattr(self, "avatarId"): print("\n\nself.avatarId =", self.avatarId) print("\nself.neededObjects =", self.neededObjects) print("\ntimed out after %s seconds.\n\n"%(task.delayTime,)) import pdb; pdb.set_trace() self.delete() return Task.done
[docs]def cleanupAsyncRequests(): """ Only call this when the application is shuting down. """ for asyncRequest in AsyncRequest._asyncRequests: asyncRequest.delete() assert AsyncRequest._asyncRequests == {}