def _sendMessage(self, nodeId, msgBuffer, tryCount = -1):
result = None
if tryCount == -1 :
tryCount = self._config.getTryCount()
for i in range(tryCount) :
if i > 0:
maxSleep = i * ArakoonClientConfig.getBackoffInterval()
self._sleep( random.randint(0, maxSleep) )
with self.__lock :
try :
connection = self._getConnection( nodeId )
connection.send( msgBuffer )
# Message sent correctly, return client connection so result
# can be read
result = connection
break
except Exception, ex:
fmt = "Attempt %d to exchange message with node %s failed with error (%s: '%s')."
ArakoonClientLogger.logWarning( fmt , i, nodeId,
ex.__class__.__name__, ex )
# Get rid of the connection in case of an exception
self._connections[nodeId].close()
del self._connections[ nodeId ]
self._masterId = None
def retrying_f (self,*args,**kwargs):
start = time.time()
tryCount = 0.0
backoffPeriod = 0.2
callSucceeded = False
retryPeriod = ArakoonClientConfig.getNoMasterRetryPeriod ()
deadline = start + retryPeriod
while( not callSucceeded and time.time() < deadline ):
try :
retVal = f(self,*args,**kwargs)
callSucceeded = True
except (ArakoonNoMaster, ArakoonNodeNotMaster, ArakoonSocketException, ArakoonNotConnected, ArakoonGoingDown) as ex:
if not is_read_only and \
isinstance(ex, (ArakoonSocketException, ArakoonGoingDown)):
raise
if len( self._config.getNodes().keys()) == 0 :
raise ArakoonInvalidConfig( "Empty client configuration" )
self._masterId = None
self.dropConnections()
sleepPeriod = backoffPeriod * tryCount
if time.time() + sleepPeriod > deadline :
raise
tryCount += 1.0
ArakoonClientLogger.logWarning( "Master not found (%s). Retrying in %0.2f sec." % (ex, sleepPeriod) )
time.sleep( sleepPeriod )
return retVal
def __init__ (self, config=None):
"""
Constructor of an Arakoon client object.
It takes one optional paramater 'config'.
This parameter contains info on the arakoon server nodes.
See the constructor of L{ArakoonClientConfig} for more details.
@type config: L{ArakoonClientConfig}
@param config: The L{ArakoonClientConfig} object to be used by the client. Defaults to None in which
case a default L{ArakoonClientConfig} object will be created.
"""
if config is None:
config = ArakoonClientConfig()
self._initialize( config )
self.__lock = threading.RLock()
self._masterId = None
self._connections = dict()
self._consistency = Consistent()
nodeList = self._config.getNodes().keys()
if len(nodeList) == 0:
raise ArakoonInvalidConfig("Node list empty.")
self._dirtyReadNode = random.choice( nodeList )
