mirror of
https://github.com/panda3d/panda3d.git
synced 2025-10-04 19:08:55 -04:00
390 lines
15 KiB
Python
390 lines
15 KiB
Python
from pandac.PandaModules import *
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from direct.task import Task
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from direct.directnotify import DirectNotifyGlobal
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from direct.showbase import DirectObject
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from PyDatagram import PyDatagram
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from PyDatagramIterator import PyDatagramIterator
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import types
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import imp
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class ConnectionRepository(DirectObject.DirectObject, CConnectionRepository):
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"""
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This is a base class for things that know how to establish a
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connection (and exchange datagrams) with a gameserver. This
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includes ClientRepository and AIRepository.
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"""
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notify = DirectNotifyGlobal.directNotify.newCategory("ConnectionRepository")
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taskPriority = -30
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def __init__(self, config):
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DirectObject.DirectObject.__init__(self)
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CConnectionRepository.__init__(self)
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self.setPythonRepository(self)
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self.config = config
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# Set this to 'http' to establish a connection to the server
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# using the HTTPClient interface, which ultimately uses the
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# OpenSSL socket library (even though SSL is not involved).
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# This is not as robust a socket library as NSPR's, but the
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# HTTPClient interface does a good job of negotiating the
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# connection over an HTTP proxy if one is in use.
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#
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# Set it to 'nspr' to use Panda's net interface
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# (e.g. QueuedConnectionManager, etc.) to establish the
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# connection, which ultimately uses the NSPR socket library.
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# This is a much better socket library, but it may be more
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# than you need for most applications; and there is no support
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# for proxies.
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#
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# Set it to 'default' to use the HTTPClient interface if a
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# proxy is in place, but the NSPR interface if we don't have a
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# proxy.
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self.connectMethod = self.config.GetString('connect-method', 'default')
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self.connectHttp = None
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self.http = None
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# This DatagramIterator is constructed once, and then re-used
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# each time we read a datagram.
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self.__di = PyDatagramIterator()
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self.recorder = None
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# This is the string that is appended to symbols read from the
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# DC file. The AIRepository will redefine this to 'AI'.
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self.dcSuffix = ''
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def readDCFile(self, dcFileNames = None):
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"""
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Reads in the dc files listed in dcFileNames, or if
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dcFileNames is None, reads in all of the dc files listed in
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the Configrc file.
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"""
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dcFile = self.getDcFile()
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dcFile.clear()
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self.dclassesByName = {}
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self.dclassesByNumber = {}
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self.hashVal = 0
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dcImports = {}
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if dcFileNames == None:
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readResult = dcFile.readAll()
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if not readResult:
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self.notify.error("Could not read dc file.")
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else:
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for dcFileName in dcFileNames:
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readResult = dcFile.read(Filename(dcFileName))
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if not readResult:
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self.notify.error("Could not read dc file: %s" % (dcFileName))
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self.hashVal = dcFile.getHash()
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# Now import all of the modules required by the DC file.
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for n in range(dcFile.getNumImportModules()):
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moduleName = dcFile.getImportModule(n)
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# Maybe the module name is represented as "moduleName/AI".
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suffix = moduleName.split('/')
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moduleName = suffix[0]
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if self.dcSuffix and self.dcSuffix in suffix[1:]:
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moduleName += self.dcSuffix
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importSymbols = []
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for i in range(dcFile.getNumImportSymbols(n)):
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symbolName = dcFile.getImportSymbol(n, i)
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# Maybe the symbol name is represented as "symbolName/AI".
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suffix = symbolName.split('/')
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symbolName = suffix[0]
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if self.dcSuffix and self.dcSuffix in suffix[1:]:
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symbolName += self.dcSuffix
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importSymbols.append(symbolName)
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self.importModule(dcImports, moduleName, importSymbols)
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# Now get the class definition for the classes named in the DC
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# file.
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for i in range(dcFile.getNumClasses()):
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dclass = dcFile.getClass(i)
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number = dclass.getNumber()
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className = dclass.getName() + self.dcSuffix
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# Does the class have a definition defined in the newly
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# imported namespace?
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classDef = dcImports.get(className)
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if classDef == None:
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self.notify.info("No class definition for %s." % (className))
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else:
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if type(classDef) == types.ModuleType:
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if not hasattr(classDef, className):
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self.notify.error("Module %s does not define class %s." % (className, className))
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classDef = getattr(classDef, className)
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if type(classDef) != types.ClassType:
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self.notify.error("Symbol %s is not a class name." % (className))
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else:
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dclass.setClassDef(classDef)
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self.dclassesByName[className] = dclass
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if number >= 0:
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self.dclassesByNumber[number] = dclass
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def importModule(self, dcImports, moduleName, importSymbols):
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"""
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Imports the indicated moduleName and all of its symbols
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into the current namespace. This more-or-less reimplements
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the Python import command.
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"""
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module = __import__(moduleName, globals(), locals(), importSymbols)
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if importSymbols:
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# "from moduleName import symbolName, symbolName, ..."
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# Copy just the named symbols into the dictionary.
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if importSymbols == ['*']:
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# "from moduleName import *"
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if hasattr(module, "__all__"):
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importSymbols = module.__all__
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else:
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importSymbols = module.__dict__.keys()
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for symbolName in importSymbols:
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if hasattr(module, symbolName):
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dcImports[symbolName] = getattr(module, symbolName)
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else:
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raise StandardError, 'Symbol %s not defined in module %s.' % (symbolName, moduleName)
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else:
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# "import moduleName"
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# Copy the root module name into the dictionary.
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# Follow the dotted chain down to the actual module.
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components = moduleName.split('.')
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dcImports[components[0]] = module
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def connect(self, serverList,
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successCallback = None, successArgs = [],
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failureCallback = None, failureArgs = []):
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"""
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Attempts to establish a connection to the server. May return
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before the connection is established. The two callbacks
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represent the two functions to call (and their arguments) on
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success or failure, respectively. The failure callback also
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gets one additional parameter, which will be passed in first:
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the return status code giving reason for failure, if it is
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known.
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"""
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## if self.recorder and self.recorder.isPlaying():
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## # If we have a recorder and it's already in playback mode,
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## # don't actually attempt to connect to a gameserver since
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## # we don't need to. Just let it play back the data.
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## self.notify.info("Not connecting to gameserver; using playback data instead.")
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## self.connectHttp = 1
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## self.tcpConn = SocketStreamRecorder()
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## self.recorder.addRecorder('gameserver', self.tcpConn)
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## self.startReaderPollTask()
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## if successCallback:
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## successCallback(*successArgs)
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## return
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hasProxy = 0
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if self.checkHttp():
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proxies = self.http.getProxiesForUrl(serverList[0])
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hasProxy = (proxies != 'DIRECT')
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if hasProxy:
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self.notify.info("Connecting to gameserver via proxy list: %s" % (proxies))
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else:
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self.notify.info("Connecting to gameserver directly (no proxy).");
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if self.connectMethod == 'http':
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self.connectHttp = 1
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elif self.connectMethod == 'nspr':
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self.connectHttp = 0
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else:
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self.connectHttp = (hasProxy or serverList[0].isSsl())
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self.bootedIndex = None
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self.bootedText = None
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if self.connectHttp:
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# In the HTTP case, we can't just iterate through the list
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# of servers, because each server attempt requires
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# spawning a request and then coming back later to check
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# the success or failure. Instead, we start the ball
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# rolling by calling the connect callback, which will call
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# itself repeatedly until we establish a connection (or
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# run out of servers).
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ch = self.http.makeChannel(0)
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self.httpConnectCallback(
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ch, serverList, 0,
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successCallback, successArgs,
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failureCallback, failureArgs)
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else:
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# Try each of the servers in turn.
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for url in serverList:
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self.notify.info("Connecting to %s via NSPR interface." % (url.cStr()))
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if self.tryConnectNspr(url):
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self.startReaderPollTask()
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if successCallback:
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successCallback(*successArgs)
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return
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# Failed to connect.
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if failureCallback:
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failureCallback(0, '', *failureArgs)
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def disconnect(self):
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"""
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Closes the previously-established connection.
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"""
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self.notify.info("Closing connection to server.")
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CConnectionRepository.disconnect(self)
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self.stopReaderPollTask()
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def httpConnectCallback(self, ch, serverList, serverIndex,
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successCallback, successArgs,
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failureCallback, failureArgs):
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if ch.isConnectionReady():
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self.setConnectionHttp(ch)
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## if self.recorder:
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## # If we have a recorder, we wrap the connect inside a
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## # SocketStreamRecorder, which will trap incoming data
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## # when the recorder is set to record mode. (It will
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## # also play back data when the recorder is in playback
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## # mode, but in that case we never get this far in the
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## # code, since we just create an empty
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## # SocketStreamRecorder without actually connecting to
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## # the gameserver.)
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## stream = SocketStreamRecorder(self.tcpConn, 1)
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## self.recorder.addRecorder('gameserver', stream)
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## # In this case, we pass ownership of the original
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## # connection to the SocketStreamRecorder object.
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## self.tcpConn.userManagesMemory = 0
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## self.tcpConn = stream
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self.startReaderPollTask()
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if successCallback:
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successCallback(*successArgs)
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elif serverIndex < len(serverList):
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# No connection yet, but keep trying.
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url = serverList[serverIndex]
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self.notify.info("Connecting to %s via HTTP interface." % (url.cStr()))
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ch.preserveStatus()
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ch.beginConnectTo(DocumentSpec(url))
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ch.spawnTask(name = 'connect-to-server',
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callback = self.httpConnectCallback,
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extraArgs = [ch, serverList, serverIndex + 1,
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successCallback, successArgs,
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failureCallback, failureArgs])
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else:
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# No more servers to try; we have to give up now.
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if failureCallback:
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failureCallback(ch.getStatusCode(), ch.getStatusString(),
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*failureArgs)
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def checkHttp(self):
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# Creates an HTTPClient, if possible, if we don't have one
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# already. This might fail if the OpenSSL library isn't
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# available. Returns the HTTPClient (also self.http), or None
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# if not set.
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if self.http == None:
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try:
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self.http = HTTPClient()
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except:
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pass
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return self.http
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def startReaderPollTask(self):
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# Stop any tasks we are running now
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self.stopReaderPollTask()
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self.accept(CConnectionRepository.getOverflowEventName(),
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self.handleReaderOverflow)
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taskMgr.add(self.readerPollUntilEmpty, "readerPollTask",
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priority = self.taskPriority)
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def stopReaderPollTask(self):
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taskMgr.remove("readerPollTask")
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self.ignore(CConnectionRepository.getOverflowEventName())
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def readerPollUntilEmpty(self, task):
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while self.readerPollOnce():
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pass
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return Task.cont
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def readerPollOnce(self):
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if self.checkDatagram():
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self.getDatagramIterator(self.__di)
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self.handleDatagram(self.__di)
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return 1
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# Unable to receive a datagram: did we lose the connection?
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if not self.isConnected():
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self.stopReaderPollTask()
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self.lostConnection()
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return 0
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def handleReaderOverflow(self):
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# this is called if the incoming-datagram queue overflowed and
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# we lost some data. Override and handle if desired.
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pass
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def lostConnection(self):
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# This should be overrided by a derived class to handle an
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# unexpectedly lost connection to the gameserver.
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self.notify.warning("Lost connection to gameserver.")
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def handleDatagram(self, di):
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# This class is meant to be pure virtual, and any classes that
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# inherit from it need to make their own handleDatagram method
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pass
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def send(self, datagram):
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if self.notify.getDebug():
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print "ConnectionRepository sending datagram:"
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datagram.dumpHex(ostream)
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self.sendDatagram(datagram)
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# debugging funcs for simulating a network-plug-pull
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def pullNetworkPlug(self):
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self.notify.warning('*** SIMULATING A NETWORK-PLUG-PULL ***')
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self.setSimulatedDisconnect(1)
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def networkPlugPulled(self):
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return self.getSimulatedDisconnect()
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def restoreNetworkPlug(self):
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if self.networkPlugPulled():
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self.notify.info('*** RESTORING SIMULATED PULLED-NETWORK-PLUG ***')
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self.setSimulatedDisconnect(0)
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def doFind(self, str):
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"""
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Returns list of distributed objects with matching str in value.
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"""
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for value in self.doId2do.values():
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if `value`.find(str) >= 0:
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return value
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def doFindAll(self, str):
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"""
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Returns list of distributed objects with matching str in value.
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"""
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matches = []
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for value in self.doId2do.values():
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if `value`.find(str) >= 0:
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matches.append(value)
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return matches
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