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313 lines
12 KiB
Python
313 lines
12 KiB
Python
from PandaModules import *
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import Task
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import DirectNotifyGlobal
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import DirectObject
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class ConnectionRepository(DirectObject.DirectObject):
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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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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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# 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 the proxy support
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# is weak.
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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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self.qcm = None
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self.cw = None
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self.tcpConn = None
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# Reader statistics
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self.rsDatagramCount = 0
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self.rsUpdateObjs = {}
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self.rsLastUpdate = 0
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self.rsDoReport = self.config.GetBool('reader-statistics', 0)
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self.rsUpdateInterval = self.config.GetDouble('reader-statistics-interval', 10)
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def connect(self, serverList, allowProxy,
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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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hasProxy = 0
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if allowProxy:
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if self.http == None:
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self.http = HTTPClient()
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proxies = self.http.getProxiesForUrl(serverList[0])
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hasProxy = (proxies != '')
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if hasProxy:
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self.notify.info("Connecting to gameserver via proxy: %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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if self.http == None:
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self.http = HTTPClient()
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ch = self.http.makeChannel(0)
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# Temporary try..except for old Pandas.
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try:
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ch.setAllowProxy(allowProxy)
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except:
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pass
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self.httpConnectCallback(ch, serverList, 0, hasProxy,
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successCallback, successArgs,
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failureCallback, failureArgs)
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else:
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if self.qcm == None:
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self.qcm = QueuedConnectionManager()
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if self.cw == None:
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self.cw = ConnectionWriter(self.qcm, 0)
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self.qcr = QueuedConnectionReader(self.qcm, 0)
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minLag = self.config.GetFloat('min-lag', 0.)
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maxLag = self.config.GetFloat('max-lag', 0.)
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if minLag or maxLag:
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self.qcr.startDelay(minLag, maxLag)
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# A big old 20 second timeout.
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gameServerTimeoutMs = self.config.GetInt("game-server-timeout-ms",
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20000)
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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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self.tcpConn = self.qcm.openTCPClientConnection(
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url.getServer(), url.getPort(),
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gameServerTimeoutMs)
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if self.tcpConn:
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self.tcpConn.setNoDelay(1)
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self.qcr.addConnection(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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# Failed to connect.
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if failureCallback:
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failureCallback(hasProxy, 0, *failureArgs)
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def disconnect(self):
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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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if self.tcpConn != None:
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if self.connectHttp:
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self.tcpConn.close()
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else:
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self.qcm.closeConnection(self.tcpConn)
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self.tcpConn = None
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self.stopReaderPollTask()
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def httpConnectCallback(self, ch, serverList, serverIndex, hasProxy,
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successCallback, successArgs,
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failureCallback, failureArgs):
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if ch.isConnectionReady():
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self.tcpConn = ch.getConnection()
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self.tcpConn.userManagesMemory = 1
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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.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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hasProxy,
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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(hasProxy, ch.getStatusCode(), *failureArgs)
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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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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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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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# we simulate the network plug being pulled by setting tcpConn
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# to None; enforce that condition
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if not self.tcpConn:
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return 0
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# Make sure any recently-sent datagrams are flushed when the
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# time expires, if we're in collect-tcp mode.
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self.tcpConn.considerFlush()
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if self.rsDoReport:
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self.reportReaderStatistics()
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if self.connectHttp:
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datagram = Datagram()
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if self.tcpConn.receiveDatagram(datagram):
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if self.rsDoReport:
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self.rsDatagramCount += 1
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self.handleDatagram(datagram)
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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 self.tcpConn.isClosed():
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self.tcpConn = None
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self.stopReaderPollTask()
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self.lostConnection()
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return 0
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else:
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self.ensureValidConnection()
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if self.qcr.dataAvailable():
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datagram = NetDatagram()
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if self.qcr.getData(datagram):
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if self.rsDoReport:
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self.rsDatagramCount += 1
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self.handleDatagram(datagram)
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return 1
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return 0
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def ensureValidConnection(self):
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# Was the connection reset?
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if self.connectHttp:
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pass
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else:
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if self.qcm.resetConnectionAvailable():
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resetConnectionPointer = PointerToConnection()
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if self.qcm.getResetConnection(resetConnectionPointer):
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resetConn = resetConnectionPointer.p()
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self.qcm.closeConnection(resetConn)
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# if we've simulated a network plug pull, restore the
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# simulated plug
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self.restoreNetworkPlug()
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if self.tcpConn.this == resetConn.this:
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self.tcpConn = None
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self.stopReaderPollTask()
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self.lostConnection()
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else:
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self.notify.warning("Lost unknown connection.")
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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, datagram):
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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 reportReaderStatistics(self):
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now = globalClock.getRealTime()
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if now - self.rsLastUpdate < self.rsUpdateInterval:
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return
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self.rsLastUpdate = now
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self.notify.info("Received %s datagrams" % (self.rsDatagramCount))
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if self.rsUpdateObjs:
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self.notify.info("Updates: %s" % (self.rsUpdateObjs))
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self.rsDatagramCount = 0
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self.rsUpdateObjs = {}
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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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if not self.tcpConn:
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self.notify.warning("Unable to send message after connection is closed.")
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return
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if self.connectHttp:
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if not self.tcpConn.sendDatagram(datagram):
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self.notify.warning("Could not send datagram.")
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else:
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self.cw.send(datagram, self.tcpConn)
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# debugging funcs for simulating a network-plug-pull
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def pullNetworkPlug(self):
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self.restoreNetworkPlug()
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self.notify.warning('*** SIMULATING A NETWORK-PLUG-PULL ***')
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self.hijackedTcpConn = self.tcpConn
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self.tcpConn = None
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def networkPlugPulled(self):
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return hasattr(self, 'hijackedTcpConn')
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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.tcpConn = self.hijackedTcpConn
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del self.hijackedTcpConn
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