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# Abstract I/O dispatcher. Defines standard dispatcher API
from pysnmp.carrier import error
class TimerCallable:
def __init__(self, cbFun, callInterval):
self.__cbFun = cbFun
self.__callInterval = callInterval
self.__nextCall = 0
def __call__(self, timeNow):
if self.__nextCall <= timeNow:
self.__cbFun(timeNow)
self.__nextCall = timeNow + self.__callInterval
def __eq__(self, cbFun): return self.__cbFun == cbFun
def __ne__(self, cbFun): return self.__cbFun != cbFun
def __lt__(self, cbFun): return self.__cbFun < cbFun
def __le__(self, cbFun): return self.__cbFun <= cbFun
def __gt__(self, cbFun): return self.__cbFun > cbFun
def __ge__(self, cbFun): return self.__cbFun >= cbFun
class AbstractTransportDispatcher:
def __init__(self):
self.__transports = {}
self.__transportDomainMap = {}
self.__jobs = {}
self.__recvCallables = {}
self.__timerCallables = []
self.__ticks = 0
self.__timerResolution = 0.5
self.__timerDelta = self.__timerResolution * 0.05
self.__nextTime = 0
self.__routingCbFun = None
def _cbFun(self, incomingTransport, transportAddress, incomingMessage):
if incomingTransport in self.__transportDomainMap:
transportDomain = self.__transportDomainMap[incomingTransport]
else:
raise error.CarrierError(
'Unregistered transport %s' % (incomingTransport,)
)
if self.__routingCbFun:
recvId = self.__routingCbFun(
transportDomain, transportAddress, incomingMessage
)
else:
recvId = None
if recvId in self.__recvCallables:
self.__recvCallables[recvId](
self, transportDomain, transportAddress, incomingMessage
)
else:
raise error.CarrierError(
'No callback for "%r" found - loosing incoming event'%(recvId,)
)
# Dispatcher API
def registerRoutingCbFun(self, routingCbFun):
if self.__routingCbFun:
raise error.CarrierError(
'Data routing callback already registered'
)
self.__routingCbFun = routingCbFun
def unregisterRoutingCbFun(self):
if self.__routingCbFun:
self.__routingCbFun = None
def registerRecvCbFun(self, recvCb, recvId=None):
if recvId in self.__recvCallables:
raise error.CarrierError(
'Receive callback %r already registered' % (recvId is None and '<default>' or recvId,)
)
self.__recvCallables[recvId] = recvCb
def unregisterRecvCbFun(self, recvId=None):
if recvId in self.__recvCallables:
del self.__recvCallables[recvId]
def registerTimerCbFun(self, timerCbFun, tickInterval=None):
if not tickInterval:
tickInterval = self.__timerResolution
self.__timerCallables.append(TimerCallable(timerCbFun, tickInterval))
def unregisterTimerCbFun(self, timerCbFun=None):
if timerCbFun:
self.__timerCallables.remove(timerCbFun)
else:
self.__timerCallables = []
def registerTransport(self, tDomain, transport):
if tDomain in self.__transports:
raise error.CarrierError(
'Transport %s already registered' % (tDomain,)
)
transport.registerCbFun(self._cbFun)
self.__transports[tDomain] = transport
self.__transportDomainMap[transport] = tDomain
def unregisterTransport(self, tDomain):
if tDomain not in self.__transports:
raise error.CarrierError(
'Transport %s not registered' % (tDomain,)
)
self.__transports[tDomain].unregisterCbFun()
del self.__transportDomainMap[self.__transports[tDomain]]
del self.__transports[tDomain]
def getTransport(self, transportDomain):
if transportDomain in self.__transports:
return self.__transports[transportDomain]
raise error.CarrierError(
'Transport %s not registered' % (transportDomain,)
)
def sendMessage(
self, outgoingMessage, transportDomain, transportAddress
):
if transportDomain in self.__transports:
self.__transports[transportDomain].sendMessage(
outgoingMessage, transportAddress
)
else:
raise error.CarrierError(
'No suitable transport domain for %s' % (transportDomain,)
)
def getTimerResolution(self):
return self.__timerResolution
def setTimerResolution(self, timerResolution):
if timerResolution < 0.01 or timerResolution > 10:
raise error.CarrierError('Impossible timer resolution')
self.__timerResolution = timerResolution
self.__timerDelta = timerResolution * 0.05
def getTimerTicks(self): return self.__ticks
def handleTimerTick(self, timeNow):
if self.__nextTime == 0: # initial initialization
self.__nextTime = timeNow + self.__timerResolution - self.__timerDelta
if self.__nextTime >= timeNow:
return
self.__ticks += 1
self.__nextTime = timeNow + self.__timerResolution - self.__timerDelta
for timerCallable in self.__timerCallables:
timerCallable(timeNow)
def jobStarted(self, jobId, count=1):
if jobId in self.__jobs:
self.__jobs[jobId] += count
else:
self.__jobs[jobId] = count
def jobFinished(self, jobId, count=1):
self.__jobs[jobId] -= count
if self.__jobs[jobId] == 0:
del self.__jobs[jobId]
def jobsArePending(self):
if self.__jobs:
return 1
else:
return 0
def runDispatcher(self, timeout=0.0):
raise error.CarrierError('Method not implemented')
def closeDispatcher(self):
for tDomain in list(self.__transports):
self.__transports[tDomain].closeTransport()
self.unregisterTransport(tDomain)
self.__transports.clear()
self.unregisterRecvCbFun()
self.unregisterTimerCbFun()
class AbstractTransport:
protoTransportDispatcher = None
_cbFun = None
@classmethod
def isCompatibleWithDispatcher(cls, transportDispatcher):
return isinstance(transportDispatcher, cls.protoTransportDispatcher)
def registerCbFun(self, cbFun):
if self._cbFun:
raise error.CarrierError(
'Callback function %s already registered at %s' % (self._cbFun, self)
)
self._cbFun = cbFun
def unregisterCbFun(self):
self._cbFun = None
def closeTransport(self):
self.unregisterCbFun()
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