def __init__(self, bw, link_name): # pragma: no cover
self.curr_tick = current_tick()
self.link = LinkBandwidth(link_name, BWSnapshot(bw * 1024, bw * 1024))
self.steady = {}
self.pend_steady = {}
self.ephemeral = {}
self.pend_ephemeral = {}
self.pending = {}
logging.info("Initialized SibraState: %s", self.link)
def _create_info(self, inc=False):
"""
Create a reservation info block, optionally incrementing the reservation
index
"""
if inc:
self._inc_idx()
exp_tick = current_tick() + RESV_LEN
return ResvInfoSteady.from_values(
tick_to_time(exp_tick), bw_cls=self.bw, index=self.idx)
def update_tick(self):
"""
Perform the tick update steps until the state is updated to the current
tick.
"""
now = current_tick()
while self.curr_tick < now:
self.curr_tick += 1
self.link.next()
self._resv_tick(self.steady)
self._resv_tick(self.ephemeral)
def _renew(self):
"""
Renew the steady path, if needed.
"""
self._check_timeout()
if self._stamp:
return
self._expire_blocks()
latest = self.blocks[-1]
if latest.info.exp_tick - current_tick() >= RESV_LEN / 2:
# If the latest block covers at least half of RESV_LEN, don't bother
# renewing yet.
return
ext = self._create_ext_use()
ext.renew(self._create_info(inc=True))
logging.debug("Sending renewal request:\n%s", ext)
pkt = self._create_sibra_pkt(ext)
self._stamp = time.time()
self.sendq.put(pkt)