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client.py
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client.py
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from twisted.application.service import Service
from twisted.internet import reactor
from twisted.internet.defer import Deferred, DeferredList
from twisted.internet.protocol import ReconnectingClientFactory
from twisted.protocols.basic import Int32StringReceiver
from carbon.conf import settings
from carbon.util import pickle
from carbon import log, state, events, instrumentation
SEND_QUEUE_LOW_WATERMARK = settings.MAX_QUEUE_SIZE * 0.8
class CarbonClientProtocol(Int32StringReceiver):
def connectionMade(self):
log.clients("%s::connectionMade" % self)
self.paused = False
self.connected = True
self.transport.registerProducer(self, streaming=True)
# Define internal metric names
self.destinationName = self.factory.destinationName
self.queuedUntilReady = 'destinations.%s.queuedUntilReady' % self.destinationName
self.sent = 'destinations.%s.sent' % self.destinationName
self.factory.connectionMade.callback(self)
self.factory.connectionMade = Deferred()
self.sendQueued()
def connectionLost(self, reason):
log.clients("%s::connectionLost %s" % (self, reason.getErrorMessage()))
self.connected = False
def pauseProducing(self):
self.paused = True
def resumeProducing(self):
self.paused = False
self.sendQueued()
def stopProducing(self):
self.disconnect()
def disconnect(self):
if self.connected:
self.transport.unregisterProducer()
self.transport.loseConnection()
self.connected = False
def sendDatapoint(self, metric, datapoint):
if self.paused:
self.factory.enqueue(metric, datapoint)
instrumentation.increment(self.queuedUntilReady)
elif self.factory.hasQueuedDatapoints():
self.factory.enqueue(metric, datapoint)
self.sendQueued()
else:
datapoints = [ (metric, datapoint) ]
self.sendString( pickle.dumps(datapoints, protocol=-1) )
instrumentation.increment(self.sent)
self.factory.checkQueue()
def sendQueued(self):
while (not self.paused) and self.factory.hasQueuedDatapoints():
datapoints = self.factory.takeSomeFromQueue()
self.sendString( pickle.dumps(datapoints, protocol=-1) )
self.factory.checkQueue()
instrumentation.increment(self.sent, len(datapoints))
if (settings.USE_FLOW_CONTROL and
state.metricReceiversPaused and
self.factory.queueSize < SEND_QUEUE_LOW_WATERMARK):
log.clients('send queue has space available, resuming paused clients')
events.resumeReceivingMetrics()
def __str__(self):
return 'CarbonClientProtocol(%s:%d:%s)' % (self.factory.destination)
__repr__ = __str__
class CarbonClientFactory(ReconnectingClientFactory):
maxDelay = 5
def __init__(self, destination):
self.destination = destination
self.destinationName = ('%s:%d:%s' % destination).replace('.', '_')
self.host, self.port, self.carbon_instance = destination
self.addr = (self.host, self.port)
self.started = False
# This factory maintains protocol state across reconnects
self.queue = [] # including datapoints that still need to be sent
self.connectedProtocol = None
self.queueEmpty = Deferred()
self.connectFailed = Deferred()
self.connectionMade = Deferred()
self.connectionLost = Deferred()
# Define internal metric names
self.attemptedRelays = 'destinations.%s.attemptedRelays' % self.destinationName
self.fullQueueDrops = 'destinations.%s.fullQueueDrops' % self.destinationName
self.queuedUntilConnected = 'destinations.%s.queuedUntilConnected' % self.destinationName
def buildProtocol(self, addr):
self.connectedProtocol = CarbonClientProtocol()
self.connectedProtocol.factory = self
return self.connectedProtocol
def startConnecting(self): # calling this startFactory yields recursion problems
self.started = True
self.connector = reactor.connectTCP(self.host, self.port, self)
def stopConnecting(self):
self.started = False
self.stopTrying()
if self.connectedProtocol and self.connectedProtocol.connected:
return self.connectedProtocol.disconnect()
@property
def queueSize(self):
return len(self.queue)
def hasQueuedDatapoints(self):
return bool(self.queue)
def takeSomeFromQueue(self):
datapoints = self.queue[:settings.MAX_DATAPOINTS_PER_MESSAGE]
self.queue = self.queue[settings.MAX_DATAPOINTS_PER_MESSAGE:]
return datapoints
def checkQueue(self):
if not self.queue:
self.queueEmpty.callback(0)
self.queueEmpty = Deferred()
def enqueue(self, metric, datapoint):
self.queue.append( (metric, datapoint) )
def sendDatapoint(self, metric, datapoint):
instrumentation.increment(self.attemptedRelays)
if len(self.queue) >= settings.MAX_QUEUE_SIZE:
log.clients('%s::sendDatapoint send queue full, dropping datapoint')
instrumentation.increment(self.fullQueueDrops)
elif self.connectedProtocol:
self.connectedProtocol.sendDatapoint(metric, datapoint)
else:
self.enqueue(metric, datapoint)
instrumentation.increment(self.queuedUntilConnected)
def startedConnecting(self, connector):
log.clients("%s::startedConnecting (%s:%d)" % (self, connector.host, connector.port))
def clientConnectionLost(self, connector, reason):
ReconnectingClientFactory.clientConnectionLost(self, connector, reason)
log.clients("%s::clientConnectionLost (%s:%d) %s" % (self, connector.host, connector.port, reason.getErrorMessage()))
self.connectedProtocol = None
self.connectionLost.callback(0)
self.connectionLost = Deferred()
def clientConnectionFailed(self, connector, reason):
ReconnectingClientFactory.clientConnectionFailed(self, connector, reason)
log.clients("%s::clientConnectionFailed (%s:%d) %s" % (self, connector.host, connector.port, reason.getErrorMessage()))
self.connectFailed.callback(dict(connector=connector, reason=reason))
self.connectFailed = Deferred()
def disconnect(self):
self.queueEmpty.addCallback(lambda result: self.stopConnecting())
readyToStop = DeferredList(
[self.connectionLost, self.connectFailed],
fireOnOneCallback=True,
fireOnOneErrback=True)
self.checkQueue()
# This can happen if the client is stopped before a connection is ever made
if (not readyToStop.called) and (not self.started):
readyToStop.callback(None)
return readyToStop
def __str__(self):
return 'CarbonClientFactory(%s:%d:%s)' % self.destination
__repr__ = __str__
class CarbonClientManager(Service):
def __init__(self, router):
self.router = router
self.client_factories = {} # { destination : CarbonClientFactory() }
def startService(self):
Service.startService(self)
for factory in self.client_factories.values():
if not factory.started:
factory.startConnecting()
def stopService(self):
Service.stopService(self)
self.stopAllClients()
def startClient(self, destination):
if destination in self.client_factories:
return
log.clients("connecting to carbon daemon at %s:%d:%s" % destination)
self.router.addDestination(destination)
factory = self.client_factories[destination] = CarbonClientFactory(destination)
connectAttempted = DeferredList(
[factory.connectionMade, factory.connectFailed],
fireOnOneCallback=True,
fireOnOneErrback=True)
if self.running:
factory.startConnecting() # this can trigger & replace connectFailed
return connectAttempted
def stopClient(self, destination):
factory = self.client_factories.get(destination)
if factory is None:
return
self.router.removeDestination(destination)
stopCompleted = factory.disconnect()
stopCompleted.addCallback(lambda result: self.disconnectClient(destination))
return stopCompleted
def disconnectClient(self, destination):
factory = self.client_factories.pop(destination)
c = factory.connector
if c and c.state == 'connecting' and not factory.hasQueuedDatapoints():
c.stopConnecting()
def stopAllClients(self):
deferreds = []
for destination in list(self.client_factories):
deferreds.append( self.stopClient(destination) )
return DeferredList(deferreds)
def sendDatapoint(self, metric, datapoint):
for destination in self.router.getDestinations(metric):
self.client_factories[destination].sendDatapoint(metric, datapoint)
def __str__(self):
return "<%s[%x]>" % (self.__class__.__name__, id(self))