def handle_pcbs_propagation(self):
"""
Generate a new beacon or gets ready to forward the one received.
"""
timestamp = int(SCIONTime.get_time())
# Create beacon for downstream ASes.
down_iof = InfoOpaqueField.from_values(timestamp, self.addr.isd_as[0])
downstream_pcb = PathSegment.from_values(down_iof)
propagated_pcbs = self.propagate_downstream_pcb(downstream_pcb)
# Create beacon for core ASes.
core_iof = InfoOpaqueField.from_values(timestamp, self.addr.isd_as[0])
core_pcb = PathSegment.from_values(core_iof)
propagated = self.propagate_core_pcb(core_pcb)
for k, v in propagated.items():
propagated_pcbs[k].extend(v)
# Propagate received beacons. A core beacon server can only receive
# beacons from other core beacon servers.
beacons = []
with self._rev_seg_lock:
for ps in self.core_beacons.values():
beacons.extend(ps.get_best_segments())
for pcb in beacons:
propagated = self.propagate_core_pcb(pcb)
for k, v in propagated.items():
propagated_pcbs[k].extend(v)
self._log_propagations(propagated_pcbs)
def _create_one_hop_path(self, egress_if):
ts = int(SCIONTime.get_time())
info = InfoOpaqueField.from_values(ts, self.addr.isd_as[0], hops=2)
hf1 = HopOpaqueField.from_values(self.HOF_EXP_TIME, 0, egress_if)
hf1.set_mac(self.of_gen_key, ts, None)
# Return a path where second HF is empty.
return SCIONPath.from_values(info, [hf1, HopOpaqueField()])
def handle_pcbs_propagation(self):
"""
Generate a new beacon or gets ready to forward the one received.
"""
timestamp = int(SCIONTime.get_time())
# Create beacon for downstream ASes.
down_iof = InfoOpaqueField.from_values(timestamp, self.addr.isd_as[0])
downstream_pcb = PathSegment.from_values(down_iof)
self.propagate_downstream_pcb(downstream_pcb)
# Create beacon for core ASes.
core_iof = InfoOpaqueField.from_values(timestamp, self.addr.isd_as[0])
core_pcb = PathSegment.from_values(core_iof)
core_count = self.propagate_core_pcb(core_pcb)
# Propagate received beacons. A core beacon server can only receive
# beacons from other core beacon servers.
beacons = []
for ps in self.core_beacons.values():
beacons.extend(ps.get_best_segments())
for pcb in beacons:
core_count += self.propagate_core_pcb(pcb)
if core_count:
logging.info("Propagated %d Core PCBs", core_count)
def test(self):
"""
Test the main functionalities of the path store.
"""
path_policy_file = "topology/ISD1/path_policies/ISD1-AD10.json"
path_policy = PathPolicy.from_file(path_policy_file)
test_segments = PathStore(path_policy)
print("Best paths: " + str(len(test_segments.get_best_segments())))
print("Paths in path store: " + str(len(test_segments.candidates)))
print("Paths in latest history snapshot: " +
str(len(test_segments.get_latest_history_snapshot())) + "\n")
path = 1
for _ in range(1, 6):
for _ in range(1, 6):
pcb = PathSegment()
pcb.iof = InfoOpaqueField.from_values(OFT.TDC_XOVR, False,
int(time.time()), path)
ad_marking = self._create_ad_marking()
pcb.add_ad(ad_marking)
print("insert path " + str(path) + ", exp time: " +
str(pcb.get_expiration_time()))
test_segments.add_segment(pcb)
path += 1
print("Best paths: " + str(len(test_segments.get_best_segments())))
print("Paths in path store: " + str(len(test_segments.candidates)))
print("Paths in latest history snapshot: " +
str(len(test_segments.get_latest_history_snapshot())))
print("Time: " + str(int(time.time())) + "\n")
time.sleep(5)
print("Waiting for some paths to expire...")
time.sleep(25)
print("Best paths: " + str(len(test_segments.get_best_segments())))
print("Paths in path store: " + str(len(test_segments.candidates)))
print("Paths in latest history snapshot: " +
str(len(test_segments.get_latest_history_snapshot())))