Example #1
0
	def build_interest(self, latest):
		if self.start_with_latest:
			latest=True
			self.start_with_latest = False

		excl = Interest.ExclusionFilter()
		excl.add_any()
		excl.add_name(Name.Name([self.latest_version]))
		# expected result should be between those two names
		excl.add_name(Name.Name([self.last_version_marker]))
		excl.add_any()

		interest = Interest.Interest(name=self.base_name, exclude=excl, \
			minSuffixComponents=3, maxSuffixComponents=3)
		interest.childSelector = 1 if latest else 0
		return interest
Example #2
0
  def fetch_media(self):
    '''Fetch remote media and control data.
    Check every 10 ms. 
    If the remote user is not Stopped, probe for its media and control;
    Otherwise, if it's Streaming, send the media Interest if the number of outstanding Interests is less than pipe_size
    '''
    if self.factory.has_local_client():
      for remote_user in self.factory.roster.values():
        if remote_user.streaming_state == RemoteUser.Stopped:
          name = remote_user.get_media_prefix()
          template = Interest(childSelector = 1)
          self.ccnx_int_socket.send_interest(name, self.probe_closure, template)
          self.__class__.__logger.debug('RTP-INT:%s', name)
          remote_user.streaming_state = RemoteUser.Probing

          # also fetch ctrl messages
          ctrl_name = remote_user.get_ctrl_prefix() + '/' + self.factory.client.local_user.uid
          self.ccnx_int_socket.send_interest(ctrl_name, self.ctrl_probe_closure, template)
          self.__class__.__logger.debug('CTRL-INT:%s', ctrl_name)
          
        elif remote_user.streaming_state == RemoteUser.Streaming:
          while remote_user.requested_seq - remote_user.fetched_seq < self.pipe_size:
            name = remote_user.get_media_prefix() + '/' + str(remote_user.requested_seq + 1)
            remote_user.requested_seq += 1
            self.ccnx_int_socket.send_interest(name, self.stream_closure)
            self.__class__.__logger.debug('RTP-INT:%s', name)
        else:
          pass
Example #3
0
    def start(self):
        self.handle.setInterestFilter(self.name, self)

        interest = Interest.Interest(name=Name.Name(self.name))
        interest.name += '\xC1.R.sw'
        interest.name.appendNonce()

        print("Expressing interest: ccnx:%s" % interest.name)

        self.handle.expressInterest(interest.name, self, interest)
        self.handle.run(-1)
Example #4
0
from pyccn import Interest, Name, Key, CCN, _pyccn
import datetime

k = CCN.getDefaultKey()

i = Interest()
i.name = Name('/hello/world')
i.minSuffixComponents = 2
i.maxSuffixComponents = 4
i.publisherPublicKeyDigest = k.publicKeyID
i.exclude = None
i.childSelector = 1
i.answerOriginKind = 4
i.scope = 2
i.interestLifetime = 30.0
i.nonce = b'abababa'

print(i)
print(i.ccn_data)

i2 = _pyccn.Interest_obj_from_ccn(i.ccn_data)
print(i2)

assert (i.name == i2.name)
assert (i.minSuffixComponents == i2.minSuffixComponents)
assert (i.maxSuffixComponents == i2.maxSuffixComponents)
assert (i.publisherPublicKeyDigest == i2.publisherPublicKeyDigest)
assert (i.exclude == i2.exclude)
assert (i.childSelector == i2.childSelector)
assert (i.scope == i2.scope)
assert (i.interestLifetime == i2.interestLifetime)
Example #5
0
import pyccn
from pyccn import CCN, Name, Interest, Key, ContentObject, Closure, KeyLocator, ExclusionFilter
from Tyzx import CompositeObject, BaseObject

prefix = "ccnx:/ndn/ucla.edu/apps/tv1/occupants"

DISCOVER_INTEREST_PERIOD = 0.250  # How often
UPDATE_INTEREST_PERIOD = 0.250
CCN_WAIT_TIME_MS = 1

tyzxObjects = {}
oldObjects = set()  # still may be in the content store

ccn = CCN()

interestDiscover = Interest()
interestDiscover.name = Name(prefix)
interestDiscover.minSuffixComponents = 2  # occupant id + the implicit digest at a minimum

interestUpdate = Interest()
interestUpdate.minSuffixComponents = 2  # time (version) + the implicit digest
interestUpdate.childSelector = 1  # rightmost child
#interestUpdate.interestLifetime = ????

lastdiscovertime = 0


def versionFromTime(t):
    bintime = struct.pack("!Q", int(t * 4096 + 0.5))
    version = bintime.lstrip(b'\x00')
    return b'\xfd' + version
Example #6
0
		event_loop.stop()

		return pyccn.RESULT_OK

senderclosure = SenderClosure()
receiverclosure = ReceiverClosure()

sender_handle = CCN()
receiver_handle = CCN()

#Looks like the CCNx API doesn't deliver messages
#that we sent to ourselves, so we just push it
sender_handle.setInterestFilter(n, senderclosure)
#senderclosure.upcall(1, None)

i = Interest()
receiver_handle.expressInterest(n, receiverclosure, i)

upcall_called = False

print("Running loops")

#So sender closure is called
#sender_handle.run(500)

#So receiver closure is called
#receiver_handle.run(500)

# New way of doing this
event_loop = pyccn.EventLoop(sender_handle, receiver_handle)
event_loop.run()
Example #7
0
from pyccn import Interest, Name, Key, CCN, _pyccn
import datetime

k = CCN.getDefaultKey()

i = Interest()
i.name = Name('/hello/world')
i.minSuffixComponents = 2
i.maxSuffixComponents = 4
i.publisherPublicKeyDigest = k.publicKeyID
i.exclude = None
i.childSelector = 1
i.answerOriginKind = 4
i.scope = 2
i.interestLifetime = 30.0
i.nonce = b'abababa'

print(i)
print(i.ccn_data)

i2 = _pyccn.Interest_obj_from_ccn(i.ccn_data)
print(i2)

assert(i.name == i2.name)
assert(i.minSuffixComponents == i2.minSuffixComponents)
assert(i.maxSuffixComponents == i2.maxSuffixComponents)
assert(i.publisherPublicKeyDigest == i2.publisherPublicKeyDigest)
assert(i.exclude == i2.exclude)
assert(i.childSelector == i2.childSelector)
assert(i.scope == i2.scope)
assert(i.interestLifetime == i2.interestLifetime)
Example #8
0
import pyccn
from pyccn import CCN, Name, Interest, Key, ContentObject, Closure, KeyLocator, ExclusionFilter
from Tyzx import CompositeObject, BaseObject

prefix = "ccnx:/ndn/ucla.edu/apps/tv1/occupants"        

DISCOVER_INTEREST_PERIOD = 0.250    # How often 
UPDATE_INTEREST_PERIOD = 0.250   
CCN_WAIT_TIME_MS = 1
        
tyzxObjects = {}    
oldObjects = set()    # still may be in the content store

ccn = CCN()

interestDiscover = Interest()
interestDiscover.name = Name(prefix)
interestDiscover.minSuffixComponents = 2   # occupant id + the implicit digest at a minimum

interestUpdate = Interest()
interestUpdate.minSuffixComponents = 2   # time (version) + the implicit digest
interestUpdate.childSelector = 1         # rightmost child
#interestUpdate.interestLifetime = ???? 

lastdiscovertime = 0     

def versionFromTime(t):
    bintime = struct.pack("!Q", int(t * 4096 + 0.5))
    version = bintime.lstrip(b'\x00')
    return b'\xfd' + version
last_version_marker = '\xfe\x00\x00\x00\x00\x00\x00'