def onDataNotFound(self, prefix, interest, face, interestFilterId, filter):
print "Data not found for interest: " + interest.getName().toUri()
if interest.getName().get(
-3).toEscapedString() == "bout" or interest.getName().get(
-3).toEscapedString() == "genericfunctions":
if interest.getName().toUri() in self.remainingTasks:
# We are already trying to process this task, so we don't add it to the list of tasks
pass
else:
self.remainingTasks[interest.getName().toUri()] = "in-progress"
else:
print "Got unexpected interest: " + interest.getName().toUri()
# .../SAMPLE/<timestamp>
timestamp = interest.getName().get(-1)
catalogInterest = Interest(self.catalogPrefix)
# Traverse catalogs in range from leftmost child
catalogInterest.setChildSelector(0)
catalogInterest.setMustBeFresh(True)
catalogInterest.setInterestLifetimeMilliseconds(4000)
exclude = Exclude()
exclude.appendAny()
exclude.appendComponent(timestamp)
catalogInterest.setExclude(catalogInterest)
self.face.expressInterest(catalogInterest, self.onCatalogData,
self.onCatalogTimeout)
print "Expressed catalog interest " + catalogInterest.getName().toUri()
return
def reissueInterest(self):
BACKOFF_THRESHOLD = 10
if self.backoffCounter > BACKOFF_THRESHOLD:
self.TIMEOUT += 50
self.backoffCounter = 0
self.logger.debug('Backing off interval to ' + str(self.TIMEOUT))
if self.backoffCounter < -BACKOFF_THRESHOLD:
self.TIMEOUT -= 50
self.backoffCounter = 0
self.logger.debug('Reducing backoff interval to ' + str(self.TIMEOUT))
if self.nextIssue is not None:
now = time.clock()
if self.nextIssue > now:
pass
# time.sleep(self.nextIssue-now)
interest = Interest(Name(self.prefix))
interest.setInterestLifetimeMilliseconds(self.interestLifetime)
interest.setMustBeFresh(False)
if self.lastVersion is not None:
e = Exclude()
e.appendAny()
e.appendComponent(self.lastVersion)
interest.setExclude(e)
interest.setChildSelector(1) #rightmost == freshest
self.face.expressInterest(interest, self.onData, self.onTimeout)
self.nextIssue = time.clock()+self.TIMEOUT/2000
def onCatalogData(self, interest, data):
# Find the next catalog
print "Received catalog data " + data.getName().toUri()
catalogTimestamp = data.getName().get(-2)
exclude = Exclude()
exclude.appendAny()
exclude.appendComponent(catalogTimestamp)
nextCatalogInterest = Interest(interest.getName())
nextCatalogInterest.setExclude(exclude)
nextCatalogInterest.setChildSelector(0)
nextCatalogInterest.setMustBeFresh(True)
nextCatalogInterest.setInterestLifetimeMilliseconds(2000)
self.face.expressInterest(nextCatalogInterest, self.onCatalogData,
self.onCatalogTimeout)
print "Expressed catalog interest " + nextCatalogInterest.getName(
).toUri()
# We ignore the version in the catalog
if self.encrypted:
self.consumer.consume(contentName, self.onCatalogConsumeComplete,
self.onConsumeFailed)
else:
self.onCatalogConsumeComplete(data, data.getContent())
def consume(self, prefix, onVerified, onVerifyFailed, onTimeout):
"""
Consume data continuously under a given prefix, each time sending interest with
the last timestamp excluded
:param name: prefix to consume data under
:type name: Name
:param onData: onData(data) gets called after received data's onVerifyFailed
:type onData: function object
:param onVerifyFailed: onVerifyFailed(data) gets called if received data
cannot be verified
:type onVerifyFailed: function object
:param onTimeout: onTimeout(interest) gets called if a consumer interest times out
:type onTimeout: function object
"""
name = Name(prefix)
interest = Interest(name)
interest.setInterestLifetimeMilliseconds(self._defaultInterestLifetime)
if self._currentTimestamp:
exclude = Exclude()
exclude.appendAny()
exclude.appendComponent(Name.Component.fromVersion(self._currentTimestamp))
interest.setExclude(exclude)
self._face.expressInterest(interest,
lambda i, d : self.onData(i, d, onVerified, onVerifyFailed, onTimeout),
lambda i: self.beforeReplyTimeout(i, onVerified, onVerifyFailed, onTimeout))
return
def onData(self, interest, data):
self._keyChain.verifyData(data, self.onVerified, self.onVerifyFailed)
dataName = data.getName()
dataQueue = None
if __debug__:
print("Got data: " + dataName.toUri() + "; " +
data.getContent().toRawStr())
for i in range(0, len(dataName)):
if dataName.get(i).toEscapedString() == AGGREGATION_COMPONENT:
dataType = dataName.get(i - 1).toEscapedString()
aggregationType = dataName.get(i + 1).toEscapedString()
startTime = int(dataName.get(i + 2).toEscapedString())
endTime = int(dataName.get(i + 3).toEscapedString())
childName = dataName.get(i - 3).toEscapedString()
dataAndAggregationType = dataType + aggregationType
dataDictKey = self.getDataDictKey(startTime, endTime,
childName)
dataQueue = self._dataQueue[dataAndAggregationType]
dataQueue._dataDict[dataDictKey] = data
break
# TODO: check what if interval/starttime is misconfigured
if dataQueue:
self.calculateAggregation(dataType, aggregationType,
dataQueue._childrenList, startTime,
endTime - startTime,
dataQueue._publishingPrefix)
# Always ask for the next piece of data when we receive this one; assumes interval does not change; this also assumes there are no more components after endTime
#newInterestName = dataName.getPrefix(i + 2).append(str(endTime)).append(str(endTime + (endTime - startTime)))
# We don't expect aggregated data name to be continuous within our given time window, so we ask with exclusion instead
newInterestName = dataName.getPrefix(i + 2)
newInterest = Interest(interest)
newInterest.setName(newInterestName)
newInterest.setChildSelector(0)
exclude = Exclude()
exclude.appendAny()
exclude.appendComponent(dataName.get(i + 2))
newInterest.setExclude(exclude)
self._face.expressInterest(newInterest, self.onData, self.onTimeout)
if __debug__:
print(" issue interest: " + interest.getName().toUri())
return
def onData(self, interest, data):
self._keyChain.verifyData(data, self.onVerified, self.onVerifyFailed)
dataName = data.getName()
dataQueue = None
if __debug__:
print("Got data: " + dataName.toUri() + "; " + data.getContent().toRawStr())
for i in range(0, len(dataName)):
if dataName.get(i).toEscapedString() == AGGREGATION_COMPONENT:
dataType = dataName.get(i - 1).toEscapedString()
aggregationType = dataName.get(i + 1).toEscapedString()
startTime = int(dataName.get(i + 2).toEscapedString())
endTime = int(dataName.get(i + 3).toEscapedString())
childName = dataName.get(i - 3).toEscapedString()
dataAndAggregationType = dataType + aggregationType
dataDictKey = self.getDataDictKey(startTime, endTime, childName)
dataQueue = self._dataQueue[dataAndAggregationType]
dataQueue._dataDict[dataDictKey] = data
break
# TODO: check what if interval/starttime is misconfigured
if dataQueue:
self.calculateAggregation(dataType, aggregationType, dataQueue._childrenList, startTime, endTime - startTime, dataQueue._publishingPrefix)
# Always ask for the next piece of data when we receive this one; assumes interval does not change; this also assumes there are no more components after endTime
#newInterestName = dataName.getPrefix(i + 2).append(str(endTime)).append(str(endTime + (endTime - startTime)))
# We don't expect aggregated data name to be continuous within our given time window, so we ask with exclusion instead
newInterestName = dataName.getPrefix(i + 2)
newInterest = Interest(interest)
newInterest.setName(newInterestName)
newInterest.setChildSelector(0)
exclude = Exclude()
exclude.appendAny()
exclude.appendComponent(dataName.get(i + 2))
newInterest.setExclude(exclude)
self._face.expressInterest(newInterest, self.onData, self.onTimeout)
if __debug__:
print(" issue interest: " + interest.getName().toUri())
return
def onSchemaVerified(self, data, onUpdateSuccess, onUpdateFailed):
print "trust schema verified: " + data.getName().toUri()
version = data.getName().get(-1)
namespace = data.getName().getPrefix(-2).toUri()
if not (namespace in self._trustSchemas):
print "unexpected: received trust schema for application namespace that's not being followed; malformed data name?"
return
if version.toVersion() <= self._trustSchemas[namespace]["version"]:
msg = "Got out-of-date trust schema"
print msg
if onUpdateFailed:
onUpdateFailed(msg)
return
self._trustSchemas[namespace]["version"] = version.toVersion()
if "pending-schema" in self._trustSchemas[namespace] and self._trustSchemas[namespace]["pending-schema"].getName().toUri() == data.getName().toUri():
# we verified a pending trust schema, don't need to keep that any more
del self._trustSchemas[namespace]["pending-schema"]
self._trustSchemas[namespace]["trust-schema"] = data.getContent().toRawStr()
print self._trustSchemas[namespace]["trust-schema"]
# TODO: what about trust schema for discovery, is discovery its own application?
newInterest = Interest(Name(data.getName()).getPrefix(-1))
newInterest.setChildSelector(1)
exclude = Exclude()
exclude.appendAny()
exclude.appendComponent(version)
newInterest.setExclude(exclude)
self._face.expressInterest(newInterest,
lambda interest, data: self.onTrustSchemaData(interest, data, onUpdateSuccess, onUpdateFailed),
lambda interest: self.onTrustSchemaTimeout(interest, onUpdateSuccess, onUpdateFailed))
# Note: this changes the verification rules for root cert, future trust schemas as well; ideally from the outside this doesn't have an impact, but do we want to avoid this?
# Per reset function in ConfigPolicyManager; For now we don't call reset as we still want root cert in our certCache, instead of asking for it again (when we want to verify) each time we update the trust schema
self._policyManager.config = BoostInfoParser()
self._policyManager.config.read(self._trustSchemas[namespace]["trust-schema"], "updated-schema")
if onUpdateSuccess:
onUpdateSuccess(data.getContent().toRawStr(), self._trustSchemas[namespace]["is-initial"])
self._trustSchemas[namespace]["is-initial"] = False
return
def expressInterestPirAndRepeat(self):
self.log.debug("callbackCountUniqueData: " + str(self._callbackCountUniqueData) + ", callbackCountTimeout: " + str(self._callbackCountTimeout))
# Express interest for each pir we have discovered
for pir in self.getPirs():
interest = Interest(Name(pir.id))
interest.setExclude(pir.status.getExclude())
interest.setInterestLifetimeMilliseconds(1000.0)
interest.setChildSelector(1)
self.face.expressInterest(interest, self.onDataPir, self.onTimeoutPir)
self._countExpressedInterests += 1
debugStr = "Sent interest: " + interest.getName().toUri()
debugStr += "\tExclude: " + interest.getExclude().toUri()
debugStr += "\tLifetime: " + str(interest.getInterestLifetimeMilliseconds())
self.log.debug(debugStr)
# Reschedule again in 0.5 sec
self.loop.call_later(1.0, self.expressInterestPirAndRepeat)
def onSchemaVerificationFailed(self, data, reason, onUpdateSuccess, onUpdateFailed):
print "trust schema verification failed: " + reason
namespace = data.getName().getPrefix(-2).toUri()
if not (namespace in self._trustSchemas):
print "unexpected: received trust schema for application namespace that's not being followed; malformed data name?"
return
newInterest = Interest(Name(data.getName()).getPrefix(-1))
newInterest.setChildSelector(1)
exclude = Exclude()
exclude.appendAny()
exclude.appendComponent(Name.Component.fromVersion(self._trustSchemas[namespace]["version"]))
newInterest.setExclude(exclude)
# Don't immediately ask for potentially the same content again if verification fails
self._face.callLater(4000, lambda :
self._face.expressInterest(newInterest,
lambda interest, data: self.onTrustSchemaData(interest, data, onUpdateSuccess, onUpdateFailed),
lambda interest: self.onTrustSchemaTimeout(interest, onUpdateSuccess, onUpdateFailed)))
return
