def fetch_seek_query(self, ns):
index = self.ts2index_add_1(ns)
#debug(self, "Fetching segment number before %s" % index)
interest = pyccn.Interest(publisherPublicKeyDigest=self.publisher_id,
childSelector=1,
answerOriginKind=pyccn.AOK_NONE)
interest.exclude = pyccn.ExclusionFilter()
interest.exclude.add_name(pyccn.Name([index]))
interest.exclude.add_any()
#debug(self, "Sending interest to %s" % self._name_frames)
#debug(self, "Exclusion list %s" % interest.exclude)
while True:
co = self._get_handle.get(self._name_frames, interest)
if co:
break
debug(self, "Timeout while seeking %d, retrying ..." % (ns))
debug(self, "Got segment: %s" % co.content)
index = co.name[-1]
segment = int(co.content)
return (self.index2ts(index), segment)
def getLatestVersion(self, name):
try:
return self.m_keyCache[str(name)]
except:
pass
base_len = len(name)
excludeList = []
version = 0
co = None
while True:
interestName = pyccn.Name(name)
exclude1 = pyccn.ExclusionFilter()
exclude1.add_names([pyccn.Name().append(n) for n in excludeList])
interest_tmpl = pyccn.Interest(exclude=exclude1,
interestLifetime=self.args.timeout,
minSuffixComponents=1,
maxSuffixComponents=100,
scope=self.args.scope)
class Slurp(pyccn.Closure):
def __init__(self):
self.finished = False
self.done = False
def upcall(self, kind, upcallInfo):
if kind == pyccn.UPCALL_CONTENT or kind == pyccn.UPCALL_CONTENT_UNVERIFIED:
self.co = upcallInfo.ContentObject
if len(self.co.name) == base_len:
self.done = True
else:
excludeList.append(self.co.name[base_len])
elif kind == pyccn.UPCALL_INTEREST_TIMED_OUT:
self.done = True
self.finished = True
return pyccn.RESULT_OK
slurp = Slurp()
self.ccn.expressInterest(interestName, slurp, interest_tmpl)
while not slurp.finished:
# print slurp.finished
self.ccn.run(1)
if slurp.done:
# print "Done with %s" % interestName
break
try:
newversion = pyccn.Name.seg2num(slurp.co.name[len(name)])
if newversion > version:
version = newversion
co = slurp.co
except:
print "ERROR: Unversioned content object: %s" % interestName
return None
self.m_keyCache[str(name)] = co
return co
def check_duration_initial(self):
global packet_hdr, packethdr_len, segment_hdr, segment_hdr_len
last_duration, duration = 0, 0
interest = pyccn.Interest(publisherPublicKeyDigest=self.publisher_id,
childSelector=1,
answerOriginKind=pyccn.AOK_DEFAULT)
exclude = interest.exclude = pyccn.ExclusionFilter()
while True:
t_start = time.time()
co = self._get_handle.get(self._name_frames, interest, 4200)
t_end = time.time()
if co is None:
# break
continue
# packet = co.content
# header = packet[:packet_hdr_len]
# offset, count = struct.unpack(packet_hdr, header)
# if count == 0 or len(packet) < packet_hdr_len + offset + segment_hdr_len:
# continue
#
# offset += packet_hdr_len
# header = packet[offset:offset + segment_hdr_len]
# duration = struct.unpack(segment_hdr, header)[1]
name = co.name[-1:]
duration = pyccn.Name.seg2num(co.name[-1])
duration_s = duration / float(gst.SECOND)
#t_packet = co.signedInfo.py_timestamp
rtt = t_end - t_start
#t_diff = t_start - t_packet
print "Duration:", datetime.timedelta(seconds=duration_s)
print "Duration diff:", duration_s - last_duration
print "Rtt:", rtt
print "Rtt diff", duration_s - last_duration - rtt
#print "Packet timestamp:", time.ctime(t_packet)
#print "Time difference:", datetime.timedelta(seconds = t_diff), t_diff
if duration_s - last_duration - rtt < 0.001:
break
print "Excluding %r" % name
exclude.reset()
exclude.add_any()
exclude.add_name(name)
last_duration = duration_s
return duration
def check_duration(self):
interest = pyccn.Interest(childSelector=1)
if self._duration_last:
interest.exclude = pyccn.ExclusionFilter()
interest.exclude.add_any()
interest.exclude.add_name(pyccn.Name([self._duration_last]))
self._handle.expressInterest(self._name_frames,
self._duration_callback, interest)
def build_interest(self, latest):
if self.start_with_latest:
latest = True
self.start_with_latest = False
excl = pyccn.ExclusionFilter()
excl.add_any()
excl.add_name(pyccn.Name([self.latest_version]))
# expected result should be between those two names
excl.add_name(pyccn.Name([self.last_version_marker]))
excl.add_any()
interest = pyccn.Interest(name = self.base_name, exclude = excl, \
minSuffixComponents = 3, maxSuffixComponents = 3)
interest.childSelector = 1 if latest else 0
return interest
def check_duration_initial(self):
duration = None
interest = pyccn.Interest(childSelector=1,
answerOriginKind=pyccn.AOK_DEFAULT)
exclude = interest.exclude = pyccn.ExclusionFilter()
while True:
res = self.__check_duration(interest)
if res is None:
break
duration, t_packet, t_diff, rtt, name = res
print "Excluding %r" % name
exclude.reset()
exclude.add_any()
exclude.add_name(name)
return duration
def fetch_last_frame(self):
assert (self.frame_rate)
interest = pyccn.Interest(childSelector=1)
if self._duration_last:
interest.exclude = pyccn.ExclusionFilter()
interest.exclude.add_any()
interest.exclude.add_name(pyccn.Name([self._duration_last]))
co = self._get_handle.get(self._name_frames, interest)
if co:
print ">%s<" % co.name
self._duration_last = co.name[-1]
print ">%s<" % self._duration_last
if self._duration_last:
self.last_frame = pytimecode.PyTimeCode(
self.frame_rate, start_timecode=self._duration_last)
else:
self.last_frame = "00:00:00:00"
def fetch_seek_query(self, tc):
debug("Fetching segment number for %s" % tc)
interest = pyccn.Interest(childSelector=1)
interest.exclude = pyccn.ExclusionFilter()
exc_tc = tc + 1
interest.exclude.add_name(pyccn.Name([exc_tc.make_timecode()]))
interest.exclude.add_any()
#debug("Sending interest to %s" % self._name_frames)
#debug("Interest: %s" % interest)
co = self._get_handle.get(self._name_frames, interest)
if not co:
raise Exception("Some bullshit exception")
debug("Got segment: %s" % co.content)
tc = pytimecode.PyTimeCode(exc_tc.framerate,
start_timecode=co.name[-1])
segment = int(co.content)
return tc, segment
import pyccn
from pyccn import _pyccn
e = pyccn.ExclusionFilter()
e.add_any()
e.add_names([pyccn.Name('/one'), pyccn.Name('/two'), pyccn.Name('/three'), pyccn.Name('/four')])
e.add_any()
e.add_name(pyccn.Name('/forty/two'))
str(e)
d = _pyccn.ExclusionFilter_obj_from_ccn(e.ccn_data)
str(d)
# I believe separation of /forty/two into /forty and /two is a correct behavior
# since it doesn't make sense to have more than one level in exclusions
result = ['<any>', '/one', '/two', '/four', '/three', '<any>', '/forty', '/two']
for a,b in zip(d.components, result):
if str(a) == b:
continue
else:
raise AssertionError("%s != %s" % (str(a), b))
def __init__(self, root, handle=None):
self.root = pyccn.Name(root)
self.exclusions = pyccn.ExclusionFilter()
self.handle = handle or pyccn.CCN()
def enumerateKeysFromNamespace(self, name):
keys = []
if self.args.verbose:
# print ">>> %s" % name
import sys
sys.stdout.write('.')
sys.stdout.flush()
base_len = len(name)
excludeList = []
while True:
interestName = pyccn.Name(name)
exclude1 = pyccn.ExclusionFilter()
exclude1.add_names([pyccn.Name().append(n) for n in excludeList])
interest_tmpl = pyccn.Interest(exclude=exclude1,
interestLifetime=self.args.timeout,
minSuffixComponents=1,
maxSuffixComponents=100,
scope=self.args.scope)
class Slurp(pyccn.Closure):
def __init__(self):
self.finished = False
self.done = False
def upcall(self, kind, upcallInfo):
if kind == pyccn.UPCALL_CONTENT or kind == pyccn.UPCALL_CONTENT_UNVERIFIED:
co = upcallInfo.ContentObject
self.name = co.name
# print co.name
if len(co.name) == base_len:
self.done = True
else:
excludeList.append(co.name[base_len])
elif kind == pyccn.UPCALL_INTEREST_TIMED_OUT:
self.done = True
self.finished = True
return pyccn.RESULT_OK
slurp = Slurp()
self.ccn.expressInterest(interestName, slurp, interest_tmpl)
while not slurp.finished:
# print slurp.finished
self.ccn.run(1)
if slurp.done:
# print "Done with %s" % interestName
break
keyFound = False
if slurp.name[base_len][0:5] == '\xc1.M.K':
if slurp.name[base_len - 1] != "info":
# if it is not a real key, but just meta
keyname = slurp.name[0:base_len + 1]
keys.append(pyccn.Name(keyname))
keyFound = True
if not keyFound:
if len(slurp.name) == base_len + 2 and slurp.name[
base_len + 1][0] == '\x00':
# skip legacy stuff
continue
if len(slurp.name) == base_len + 4 and slurp.name[
base_len] == "info" and slurp.name[base_len +
3][0] == '\x00':
# skip metadata
continue
# recursive step
higherName = slurp.name[base_len]
newName = pyccn.Name(interestName).append(higherName)
keys += self.enumerateKeysFromNamespace(newName)
return keys
