"""ServerRepository module: contains the ServerRepository class"""
from panda3d.core import *
from panda3d.direct import *
from direct.distributed.MsgTypesCMU import *
from direct.task import Task
from direct.directnotify import DirectNotifyGlobal
from direct.distributed.PyDatagram import PyDatagram
import inspect
[docs]class ServerRepository:
""" This maintains the server-side connection with a Panda server.
It is only for use with the Panda LAN server provided by CMU."""
notify = DirectNotifyGlobal.directNotify.newCategory("ServerRepository")
[docs] class Client:
""" This internal class keeps track of the data associated
with each connected client. """
[docs] def __init__(self, connection, netAddress, doIdBase):
# The connection used to communicate with the client.
self.connection = connection
# The net address to the client, including IP address.
# Used for reporting purposes only.
self.netAddress = netAddress
# The first doId in the range assigned to the client.
# This also serves as a unique numeric ID for this client.
# (It is sometimes called "avatarId" in some update
# messages, even though the client is not required to use
# this particular number as an avatar ID.)
self.doIdBase = doIdBase
# The set of zoneIds that the client explicitly has
# interest in. The client will receive updates for all
# distributed objects appearing in one of these zones.
# (The client will also receive updates for all zones in
# which any one of the distributed obejcts that it has
# created still exist.)
self.explicitInterestZoneIds = set()
# The set of interest zones sent to the client at the last
# update. This is the actual set of zones the client is
# informed of. Changing the explicitInterestZoneIds,
# above, creating or deleting objects in different zones,
# or moving objects between zones, might influence this
# set.
self.currentInterestZoneIds = set()
# A dictionary of doId -> Object, for distributed objects
# currently in existence that were created by the client.
self.objectsByDoId = {}
# A dictionary of zoneId -> set([Object]), listing the
# distributed objects assigned to each zone, of the
# objects created by this client.
self.objectsByZoneId = {}
[docs] class Object:
""" This internal class keeps track of the data associated
with each extent distributed object. """
[docs] def __init__(self, doId, zoneId, dclass):
# The object's distributed ID.
self.doId = doId
# The object's current zone. Each object is associated
# with only one zone.
self.zoneId = zoneId
# The object's class type.
self.dclass = dclass
# Note that the server does not store any other data about
# the distributed objects; in particular, it doesn't
# record its current fields. That is left to the clients.
[docs] def __init__(self, tcpPort, serverAddress = None,
udpPort = None, dcFileNames = None,
threadedNet = None):
if threadedNet is None:
# Default value.
threadedNet = config.GetBool('threaded-net', False)
# Set up networking interfaces.
numThreads = 0
if threadedNet:
numThreads = 1
self.qcm = QueuedConnectionManager()
self.qcl = QueuedConnectionListener(self.qcm, numThreads)
self.qcr = QueuedConnectionReader(self.qcm, numThreads)
self.cw = ConnectionWriter(self.qcm, numThreads)
taskMgr.setupTaskChain('flushTask')
if threadedNet:
taskMgr.setupTaskChain('flushTask', numThreads = 1,
threadPriority = TPLow, frameSync = True)
self.tcpRendezvous = self.qcm.openTCPServerRendezvous(
serverAddress or '', tcpPort, 10)
self.qcl.addConnection(self.tcpRendezvous)
taskMgr.add(self.listenerPoll, "serverListenerPollTask")
taskMgr.add(self.readerPollUntilEmpty, "serverReaderPollTask")
taskMgr.add(self.clientHardDisconnectTask, "clientHardDisconnect")
# A set of clients that have recently been written to and may
# need to be flushed.
self.needsFlush = set()
collectTcpInterval = ConfigVariableDouble('collect-tcp-interval').getValue()
taskMgr.doMethodLater(collectTcpInterval, self.flushTask, 'flushTask',
taskChain = 'flushTask')
# A dictionary of connection -> Client object, tracking all of
# the clients we currently have connected.
self.clientsByConnection = {}
# A similar dictionary of doIdBase -> Client object, indexing
# by the client's doIdBase number instead.
self.clientsByDoIdBase = {}
# A dictionary of zoneId -> set([Client]), listing the clients
# that have an interest in each zoneId.
self.zonesToClients = {}
# A dictionary of zoneId -> set([Object]), listing the
# distributed objects assigned to each zone, globally.
self.objectsByZoneId = {}
# The number of doId's to assign to each client. Must remain
# constant during server lifetime.
self.doIdRange = base.config.GetInt('server-doid-range', 1000000)
# An allocator object that assigns the next doIdBase to each
# client.
self.idAllocator = UniqueIdAllocator(0, 0xffffffff // self.doIdRange)
self.dcFile = DCFile()
self.dcSuffix = ''
self.readDCFile(dcFileNames)
[docs] def flushTask(self, task):
""" This task is run periodically to flush any connections
that might need it. It's only necessary in cases where
collect-tcp is set true (if this is false, messages are sent
immediately and do not require periodic flushing). """
flush = self.needsFlush
self.needsFlush = set()
for client in flush:
client.connection.flush()
return Task.again
[docs] def importModule(self, dcImports, moduleName, importSymbols):
""" Imports the indicated moduleName and all of its symbols
into the current namespace. This more-or-less reimplements
the Python import command. """
module = __import__(moduleName, globals(), locals(), importSymbols)
if importSymbols:
# "from moduleName import symbolName, symbolName, ..."
# Copy just the named symbols into the dictionary.
if importSymbols == ['*']:
# "from moduleName import *"
if hasattr(module, "__all__"):
importSymbols = module.__all__
else:
importSymbols = module.__dict__.keys()
for symbolName in importSymbols:
if hasattr(module, symbolName):
dcImports[symbolName] = getattr(module, symbolName)
else:
raise Exception('Symbol %s not defined in module %s.' % (symbolName, moduleName))
else:
# "import moduleName"
# Copy the root module name into the dictionary.
# Follow the dotted chain down to the actual module.
components = moduleName.split('.')
dcImports[components[0]] = module
[docs] def readDCFile(self, dcFileNames = None):
"""
Reads in the dc files listed in dcFileNames, or if
dcFileNames is None, reads in all of the dc files listed in
the Configrc file.
"""
dcFile = self.dcFile
dcFile.clear()
self.dclassesByName = {}
self.dclassesByNumber = {}
self.hashVal = 0
dcImports = {}
if dcFileNames == None:
readResult = dcFile.readAll()
if not readResult:
self.notify.error("Could not read dc file.")
else:
searchPath = getModelPath().getValue()
for dcFileName in dcFileNames:
pathname = Filename(dcFileName)
vfs = VirtualFileSystem.getGlobalPtr()
vfs.resolveFilename(pathname, searchPath)
readResult = dcFile.read(pathname)
if not readResult:
self.notify.error("Could not read dc file: %s" % (pathname))
self.hashVal = dcFile.getHash()
# Now import all of the modules required by the DC file.
for n in range(dcFile.getNumImportModules()):
moduleName = dcFile.getImportModule(n)
# Maybe the module name is represented as "moduleName/AI".
suffix = moduleName.split('/')
moduleName = suffix[0]
if self.dcSuffix and self.dcSuffix in suffix[1:]:
moduleName += self.dcSuffix
importSymbols = []
for i in range(dcFile.getNumImportSymbols(n)):
symbolName = dcFile.getImportSymbol(n, i)
# Maybe the symbol name is represented as "symbolName/AI".
suffix = symbolName.split('/')
symbolName = suffix[0]
if self.dcSuffix and self.dcSuffix in suffix[1:]:
symbolName += self.dcSuffix
importSymbols.append(symbolName)
self.importModule(dcImports, moduleName, importSymbols)
# Now get the class definition for the classes named in the DC
# file.
for i in range(dcFile.getNumClasses()):
dclass = dcFile.getClass(i)
number = dclass.getNumber()
className = dclass.getName() + self.dcSuffix
# Does the class have a definition defined in the newly
# imported namespace?
classDef = dcImports.get(className)
# Also try it without the dcSuffix.
if classDef == None:
className = dclass.getName()
classDef = dcImports.get(className)
if classDef == None:
self.notify.debug("No class definition for %s." % (className))
else:
if inspect.ismodule(classDef):
if not hasattr(classDef, className):
self.notify.error("Module %s does not define class %s." % (className, className))
classDef = getattr(classDef, className)
if not inspect.isclass(classDef):
self.notify.error("Symbol %s is not a class name." % (className))
else:
dclass.setClassDef(classDef)
self.dclassesByName[className] = dclass
if number >= 0:
self.dclassesByNumber[number] = dclass
# listens for new clients
[docs] def listenerPoll(self, task):
if self.qcl.newConnectionAvailable():
rendezvous = PointerToConnection()
netAddress = NetAddress()
newConnection = PointerToConnection()
retVal = self.qcl.getNewConnection(rendezvous, netAddress,
newConnection)
if not retVal:
return Task.cont
# Crazy dereferencing
newConnection = newConnection.p()
# Add clients information to dictionary
id = self.idAllocator.allocate()
doIdBase = id * self.doIdRange + 1
self.notify.info(
"Got client %s from %s" % (doIdBase, netAddress))
client = self.Client(newConnection, netAddress, doIdBase)
self.clientsByConnection[client.connection] = client
self.clientsByDoIdBase[client.doIdBase] = client
# Now we can start listening to that new connection.
self.qcr.addConnection(newConnection)
self.lastConnection = newConnection
self.sendDoIdRange(client)
return Task.cont
[docs] def readerPollUntilEmpty(self, task):
""" continuously polls for new messages on the server """
while self.readerPollOnce():
pass
return Task.cont
[docs] def readerPollOnce(self):
""" checks for available messages to the server """
availGetVal = self.qcr.dataAvailable()
if availGetVal:
datagram = NetDatagram()
readRetVal = self.qcr.getData(datagram)
if readRetVal:
# need to send to message processing unit
self.handleDatagram(datagram)
return availGetVal
[docs] def handleDatagram(self, datagram):
""" switching station for messages """
client = self.clientsByConnection.get(datagram.getConnection())
if not client:
# This shouldn't be possible, though it appears to happen
# sometimes?
self.notify.warning(
"Ignoring datagram from unknown connection %s" % (datagram.getConnection()))
return
if self.notify.getDebug():
self.notify.debug(
"ServerRepository received datagram from %s:" % (client.doIdBase))
#datagram.dumpHex(ostream)
dgi = DatagramIterator(datagram)
type = dgi.getUint16()
if type == CLIENT_DISCONNECT_CMU:
self.handleClientDisconnect(client)
elif type == CLIENT_SET_INTEREST_CMU:
self.handleClientSetInterest(client, dgi)
elif type == CLIENT_OBJECT_GENERATE_CMU:
self.handleClientCreateObject(datagram, dgi)
elif type == CLIENT_OBJECT_UPDATE_FIELD:
self.handleClientObjectUpdateField(datagram, dgi)
elif type == CLIENT_OBJECT_UPDATE_FIELD_TARGETED_CMU:
self.handleClientObjectUpdateField(datagram, dgi, targeted = True)
elif type == OBJECT_DELETE_CMU:
self.handleClientDeleteObject(datagram, dgi.getUint32())
elif type == OBJECT_SET_ZONE_CMU:
self.handleClientObjectSetZone(datagram, dgi)
else:
self.handleMessageType(type, dgi)
[docs] def handleMessageType(self, msgType, di):
self.notify.warning("unrecognized message type %s" % (msgType))
[docs] def handleClientCreateObject(self, datagram, dgi):
""" client wants to create an object, so we store appropriate
data, and then pass message along to corresponding zones """
connection = datagram.getConnection()
zoneId = dgi.getUint32()
classId = dgi.getUint16()
doId = dgi.getUint32()
client = self.clientsByConnection[connection]
if self.getDoIdBase(doId) != client.doIdBase:
self.notify.warning(
"Ignoring attempt to create invalid doId %s from client %s" % (doId, client.doIdBase))
return
dclass = self.dclassesByNumber[classId]
object = client.objectsByDoId.get(doId)
if object:
# This doId is already in use; thus, this message is
# really just an update.
if object.dclass != dclass:
self.notify.warning(
"Ignoring attempt to change object %s from %s to %s by client %s" % (
doId, object.dclass.getName(), dclass.getName(), client.doIdBase))
return
self.setObjectZone(client, object, zoneId)
else:
if self.notify.getDebug():
self.notify.debug(
"Creating object %s of type %s by client %s" % (
doId, dclass.getName(), client.doIdBase))
object = self.Object(doId, zoneId, dclass)
client.objectsByDoId[doId] = object
client.objectsByZoneId.setdefault(zoneId, set()).add(object)
self.objectsByZoneId.setdefault(zoneId, set()).add(object)
self.updateClientInterestZones(client)
# Rebuild the new datagram that we'll send on. We shim in the
# doIdBase of the owner.
dg = PyDatagram()
dg.addUint16(OBJECT_GENERATE_CMU)
dg.addUint32(client.doIdBase)
dg.addUint32(zoneId)
dg.addUint16(classId)
dg.addUint32(doId)
dg.appendData(dgi.getRemainingBytes())
self.sendToZoneExcept(zoneId, dg, [client])
[docs] def handleClientObjectUpdateField(self, datagram, dgi, targeted = False):
""" Received an update request from a client. """
connection = datagram.getConnection()
client = self.clientsByConnection[connection]
if targeted:
targetId = dgi.getUint32()
doId = dgi.getUint32()
fieldId = dgi.getUint16()
doIdBase = self.getDoIdBase(doId)
owner = self.clientsByDoIdBase.get(doIdBase)
object = owner and owner.objectsByDoId.get(doId)
if not object:
self.notify.warning(
"Ignoring update for unknown object %s from client %s" % (
doId, client.doIdBase))
return
dcfield = object.dclass.getFieldByIndex(fieldId)
if dcfield == None:
self.notify.warning(
"Ignoring update for field %s on object %s from client %s; no such field for class %s." % (
fieldId, doId, client.doIdBase, object.dclass.getName()))
if client != owner:
# This message was not sent by the object's owner.
if not dcfield.hasKeyword('clsend') and not dcfield.hasKeyword('p2p'):
self.notify.warning(
"Ignoring update for %s.%s on object %s from client %s: not owner" % (
object.dclass.getName(), dcfield.getName(), doId, client.doIdBase))
return
# We reformat the message slightly to insert the sender's
# doIdBase.
dg = PyDatagram()
dg.addUint16(OBJECT_UPDATE_FIELD_CMU)
dg.addUint32(client.doIdBase)
dg.addUint32(doId)
dg.addUint16(fieldId)
dg.appendData(dgi.getRemainingBytes())
if targeted:
# A targeted update: only to the indicated client.
target = self.clientsByDoIdBase.get(targetId)
if not target:
self.notify.warning(
"Ignoring targeted update to %s for %s.%s on object %s from client %s: target not known" % (
targetId,
dclass.getName(), dcfield.getName(), doId, client.doIdBase))
return
self.cw.send(dg, target.connection)
self.needsFlush.add(target)
elif dcfield.hasKeyword('p2p'):
# p2p: to object owner only
self.cw.send(dg, owner.connection)
self.needsFlush.add(owner)
elif dcfield.hasKeyword('broadcast'):
# Broadcast: to everyone except orig sender
self.sendToZoneExcept(object.zoneId, dg, [client])
elif dcfield.hasKeyword('reflect'):
# Reflect: broadcast to everyone including orig sender
self.sendToZoneExcept(object.zoneId, dg, [])
else:
self.notify.warning(
"Message is not broadcast or p2p")
[docs] def getDoIdBase(self, doId):
""" Given a doId, return the corresponding doIdBase. This
will be the owner of the object (clients may only create
object doId's within their assigned range). """
return int(doId / self.doIdRange) * self.doIdRange + 1
[docs] def handleClientDeleteObject(self, datagram, doId):
""" client deletes an object, let everyone who has interest in
the object's zone know about it. """
connection = datagram.getConnection()
client = self.clientsByConnection[connection]
object = client.objectsByDoId.get(doId)
if not object:
self.notify.warning(
"Ignoring update for unknown object %s from client %s" % (
doId, client.doIdBase))
return
self.sendToZoneExcept(object.zoneId, datagram, [])
self.objectsByZoneId[object.zoneId].remove(object)
if not self.objectsByZoneId[object.zoneId]:
del self.objectsByZoneId[object.zoneId]
client.objectsByZoneId[object.zoneId].remove(object)
if not client.objectsByZoneId[object.zoneId]:
del client.objectsByZoneId[object.zoneId]
del client.objectsByDoId[doId]
self.updateClientInterestZones(client)
[docs] def handleClientObjectSetZone(self, datagram, dgi):
""" The client is telling us the object is changing to a new
zone. """
doId = dgi.getUint32()
zoneId = dgi.getUint32()
connection = datagram.getConnection()
client = self.clientsByConnection[connection]
object = client.objectsByDoId.get(doId)
if not object:
# Don't know this object.
self.notify.warning("Ignoring object location for %s: unknown" % (doId))
return
self.setObjectZone(client, object, zoneId)
[docs] def setObjectZone(self, owner, object, zoneId):
if object.zoneId == zoneId:
# No change.
return
oldZoneId = object.zoneId
self.objectsByZoneId[object.zoneId].remove(object)
if not self.objectsByZoneId[object.zoneId]:
del self.objectsByZoneId[object.zoneId]
owner.objectsByZoneId[object.zoneId].remove(object)
if not owner.objectsByZoneId[object.zoneId]:
del owner.objectsByZoneId[object.zoneId]
object.zoneId = zoneId
self.objectsByZoneId.setdefault(zoneId, set()).add(object)
owner.objectsByZoneId.setdefault(zoneId, set()).add(object)
self.updateClientInterestZones(owner)
# Any clients that are listening to oldZoneId but not zoneId
# should receive a disable message: this object has just gone
# out of scope for you.
datagram = PyDatagram()
datagram.addUint16(OBJECT_DISABLE_CMU)
datagram.addUint32(object.doId)
for client in self.zonesToClients[oldZoneId]:
if client != owner:
if zoneId not in client.currentInterestZoneIds:
self.cw.send(datagram, client.connection)
self.needsFlush.add(client)
# The client is now responsible for sending a generate for the
# object that just switched zones, to inform the clients that
# are listening to the new zoneId but not the old zoneId.
[docs] def sendDoIdRange(self, client):
""" sends the client the range of doid's that the client can
use """
datagram = NetDatagram()
datagram.addUint16(SET_DOID_RANGE_CMU)
datagram.addUint32(client.doIdBase)
datagram.addUint32(self.doIdRange)
self.cw.send(datagram, client.connection)
self.needsFlush.add(client)
# a client disconnected from us, we need to update our data, also
# tell other clients to remove the disconnected clients objects
[docs] def handleClientDisconnect(self, client):
for zoneId in client.currentInterestZoneIds:
if len(self.zonesToClients[zoneId]) == 1:
del self.zonesToClients[zoneId]
else:
self.zonesToClients[zoneId].remove(client)
for object in client.objectsByDoId.values():
#create and send delete message
datagram = NetDatagram()
datagram.addUint16(OBJECT_DELETE_CMU)
datagram.addUint32(object.doId)
self.sendToZoneExcept(object.zoneId, datagram, [])
self.objectsByZoneId[object.zoneId].remove(object)
if not self.objectsByZoneId[object.zoneId]:
del self.objectsByZoneId[object.zoneId]
client.objectsByDoId = {}
client.objectsByZoneId = {}
del self.clientsByConnection[client.connection]
del self.clientsByDoIdBase[client.doIdBase]
id = client.doIdBase // self.doIdRange
self.idAllocator.free(id)
self.qcr.removeConnection(client.connection)
self.qcm.closeConnection(client.connection)
[docs] def handleClientSetInterest(self, client, dgi):
""" The client is specifying a particular set of zones it is
interested in. """
zoneIds = set()
while dgi.getRemainingSize() > 0:
zoneId = dgi.getUint32()
zoneIds.add(zoneId)
client.explicitInterestZoneIds = zoneIds
self.updateClientInterestZones(client)
[docs] def updateClientInterestZones(self, client):
""" Something about the client has caused its set of interest
zones to potentially change. Recompute them. """
origZoneIds = client.currentInterestZoneIds
newZoneIds = client.explicitInterestZoneIds | set(client.objectsByZoneId.keys())
if origZoneIds == newZoneIds:
# No change.
return
client.currentInterestZoneIds = newZoneIds
addedZoneIds = newZoneIds - origZoneIds
removedZoneIds = origZoneIds - newZoneIds
for zoneId in addedZoneIds:
self.zonesToClients.setdefault(zoneId, set()).add(client)
# The client is opening interest in this zone. Need to get
# all of the data from clients who may have objects in
# this zone
datagram = NetDatagram()
datagram.addUint16(REQUEST_GENERATES_CMU)
datagram.addUint32(zoneId)
self.sendToZoneExcept(zoneId, datagram, [client])
datagram = PyDatagram()
datagram.addUint16(OBJECT_DISABLE_CMU)
for zoneId in removedZoneIds:
self.zonesToClients[zoneId].remove(client)
# The client is abandoning interest in this zone. Any
# objects in this zone should be disabled for the client.
for object in self.objectsByZoneId.get(zoneId, []):
datagram.addUint32(object.doId)
self.cw.send(datagram, client.connection)
self.needsFlush.add(client)
[docs] def clientHardDisconnectTask(self, task):
""" client did not tell us he was leaving but we lost connection to
him, so we need to update our data and tell others """
for client in list(self.clientsByConnection.values()):
if not self.qcr.isConnectionOk(client.connection):
self.handleClientDisconnect(client)
return Task.cont
[docs] def sendToZoneExcept(self, zoneId, datagram, exceptionList):
"""sends a message to everyone who has interest in the
indicated zone, except for the clients on exceptionList."""
if self.notify.getDebug():
self.notify.debug(
"ServerRepository sending to all in zone %s except %s:" % (zoneId, [c.doIdBase for c in exceptionList]))
#datagram.dumpHex(ostream)
for client in self.zonesToClients.get(zoneId, []):
if client not in exceptionList:
if self.notify.getDebug():
self.notify.debug(
" -> %s" % (client.doIdBase))
self.cw.send(datagram, client.connection)
self.needsFlush.add(client)
[docs] def sendToAllExcept(self, datagram, exceptionList):
""" sends a message to all connected clients, except for
clients on exceptionList. """
if self.notify.getDebug():
self.notify.debug(
"ServerRepository sending to all except %s:" % ([c.doIdBase for c in exceptionList],))
#datagram.dumpHex(ostream)
for client in self.clientsByConnection.values():
if client not in exceptionList:
if self.notify.getDebug():
self.notify.debug(
" -> %s" % (client.doIdBase))
self.cw.send(datagram, client.connection)
self.needsFlush.add(client)
