def express_interest(self):
if self.chunkinfo == None:#a new chunk requested
self.chunkinfo = ChunkInfo(self.mydata.next_seg)
self.chunkinfo.begin_byte = self.mydata.next_byte
self.chunkinfo.expected_chunk_size = self.mydata.estimated_optimal_size or self.default_block_size
self.chunkinfo.beginT = datetime.datetime.now()
self.mydata.add_chunk_info(self.chunkinfo)
self.chunkinfo.retxN += 1
selector = pyndn.Interest()
selector.answerOriginKind = True
name = self.name
chunkid = self.mydata.next_seg
if self.mod == "adaptive": #byte index as chunkid
name = self.name.append(ADAPTIVE_MOD_FLAG).append(str(self.chunkinfo.expected_chunk_size))
chunkid = self.mydata.next_byte
if self.interest_schema == "exclusion": #do not use this
selector = pyndn.Interest(exclude = self.exclusions)
selector.answerOriginKind = True
elif self.interest_schema == "id":#the default one
name = pyndn.Name(name.components)
name = name.append(chunkid)
elif self.interest_schema == "segment":
name = pyndn.Name(name.components)
name = name.appendSegment(chunkid)
self.handle.expressInterest(name, self, selector)
#log.info("express interest %s, exclusions: %s" %(str(self.name), self.exclusions));
log.debug("interest=%s " %name)
def requestSegment(self, segmentNumber):
# if self.pendingSegmentCount < self.pendingSegmentMax:
self.pendingSegments.add(segmentNumber)
segmentName = pyndn.Name(self.redirect.getName())
segmentName.appendSegment(segmentNumber)
interest = pyndn.Interest(segmentName)
print("Sent segment interest '{}'".format(interestToString(interest)))
self.face.expressInterest(interest, self.receiveSegment, self.timeoutSegment)
def request(self,req,callback,content= None, mustbefresh= False):
baseName = ndn.Name(req)
interest = ndn.Interest(ndn.Name(baseName))
interest.setMustBeFresh(mustbefresh)
self.callback = callback
if content != None:
interest.setContent(content)
self.face.expressInterest(interest, self._onData, self._onTimeout)
self.loop.run_forever()
def sendIntermediate(self, index):
name = self.interest.getName()
name = name.getSubName(0, name.size() - 1).append("INTERMEDIATE").append(str(index)).append("NFN")
interest = pyndn.Interest(name)
# print("Sending intermediate interest '{}'.".format(interestToString(interest)))
# self.face.expressInterest(interest, self.receiveIntermediate, self.timeoutIntermediate)
request = SimpleRequest(self.face, interest, self.receiveIntermediate, self.timeoutIntermediate)
self.childRequests.append(request)
request.send()
def receiveData(self, interest, data):
content = data.getContent().toRawStr()
redirectPrefix = "redirect:"
if content.startswith(redirectPrefix):
name = content[len(redirectPrefix):]
self.redirect = pyndn.Interest(pyndn.Name(name))
print("Received redirect for interest '{}' -> '{}':\n{}"
.format(interestToString(interest), interestToString(self.redirect), data.getContent()))
self.requestNextSegment()
else:
print("Received data for interest '{}':\n{}".format(interestToString(interest), urllib.unquote(content)))
self.data = data
self.onData(self)
def send_chunk_entities_interest(chunk_peer, x, y):
# TODO: Bigger timeout (tree times the current one)
name = pyndn.Name(chunk_peer.prefix) \
.append('chunk') \
.append(str(x)).append(str(y)) \
.append('entities')
logger.debug('Sending ChunkEntitiesInterest to %s', name.toUri())
interest = pyndn.Interest(name)
# About three times a normal timeout as two timeout may occur before
# the chunk is created.
interest.setInterestLifetimeMilliseconds(30000)
mngt.context.face.expressInterest(
interest,
mngt.on_chunk_entities_data,
mngt.on_chunk_entities_timeout)
def send_fetch_entity_interest(peer, uid):
logger.debug('Sending FetchEntityInterest for entity %d to peer %d',
uid, peer.uid)
name = pyndn.Name(peer.prefix) \
.append('entity') \
.append(str(uid)) \
.append('fetch')
interest = pyndn.Interest(name)
# About three times a normal timeout as two timeout may occur before
# the chunk is created.
interest.setInterestLifetimeMilliseconds(30000)
mngt.context.face.expressInterest(
interest,
mngt.on_fetch_entity_data,
mngt.on_fetch_entity_timeout)
def build_interest(self, latest):
if self.start_with_latest:
latest = True
self.start_with_latest = False
excl = pyndn.ExclusionFilter()
excl.add_any()
excl.add_name(pyndn.Name([self.latest_version]))
# expected result should be between those two names
excl.add_name(pyndn.Name([self.last_version_marker]))
excl.add_any()
interest = pyndn.Interest(name=self.base_name, exclude=excl, \
minSuffixComponents=3, maxSuffixComponents=3)
interest.childSelector = 1 if latest else 0
return interest
def get_candidates():
commandInterestName = ndn.Name()
commandInterestName.wireDecode(
# ndn.Blob(buffer(base64.b64decode(request.form['commandInterest']))))
ndn.Blob(base64.b64decode(request.form['commandInterest'])))
site_prefix = ndn.Name()
site_prefix.wireDecode(commandInterestName[-3].getValue().toBuffer())
timestamp = commandInterestName[-4]
signature = ndn.WireFormat.getDefaultWireFormat(
).decodeSignatureInfoAndValue(
commandInterestName[-2].getValue().toBuffer(),
commandInterestName[-1].getValue().toBuffer())
keyLocator = signature.getKeyLocator().getKeyName()
operator = mongo.db.operators.find_one(
{'site_prefix': site_prefix.toUri()})
if operator == None:
abort(403)
try:
keyChain = KeyChain(
policyManager=OperatorVerifyPolicyManager(operator))
def onVerified(interest):
pass
def onVerifyFailed(interest):
raise RuntimeError("Operator verification failed")
keyChain.verifyInterest(ndn.Interest(commandInterestName),
onVerified,
onVerifyFailed,
stepCount=1)
except Exception as e:
print("ERROR: %s" % e)
abort(403)
# Will get here if verification succeeds
requests = mongo.db.requests.find({'operator_id': str(operator['_id'])})
output = []
for req in requests:
output.append(req)
return json.dumps(output, default=json_util.default)
def _requestNext(self):
interest = ndn.Interest(
ndn.Name(self.baseName).appendSequenceNumber(self.currentSeqNo))
interest.setMustBeFresh(True)
self.face.expressInterest(interest, self._onData, self._onTimeout)
self.currentSeqNo += 1
import pyndn
import pyndn._pyndn as _pyndn
k = pyndn.NDN.getDefaultKey()
kl = pyndn.KeyLocator(k)
i = pyndn.Interest()
i.name = pyndn.Name('/chat')
i.minSuffixComponents = 3
i.maxSuffixComponents = 3
i.childSelector = 1
co = pyndn.ContentObject()
co.name = pyndn.Name('/chat/%FD%04%E6%93.%18K/%00')
co.content = "number 0"
co.signedInfo.publisherPublicKeyDigest = k.publicKeyID
co.signedInfo.finalBlockID = b'\x00'
co.sign(k)
print(str(co))
co2 = _pyndn.ContentObject_obj_from_ndn(co.ndn_data)
print(str(co2))
print(str(i))
print(co.matchesInterest(i))
def express_my_interest(self):
templ = pyndn.Interest(exclude=self.exclusions)
self.handle.expressInterest(self.root, self, templ)
def sendKeepalive(self):
name = self.interest.getName()
name = name.getSubName(0, name.size() - 1).append("ALIVE").append("NFN")
interest = pyndn.Interest(name)
print("Sending keepalive interest '{}'.".format(interestToString(interest)))
self.face.expressInterest(interest, self.receiveKeepalive, self.timeoutKeepalive)
