def on_view_change_event(self, slot, viewid, peers):
self.viewid = viewid
self.peers = peers
self.is_primary = view_primary(viewid, peers) == self.address
# we are not an active leader in this new view
if self.scout:
self.scout.finished(None, None) # eventually calls preempted
elif self.active:
self.preempted(None)
elif self.is_primary:
self.spawn_scout()
def propose(self, proposal, slot=None):
if not slot:
slot = self.next_slot
self.next_slot += 1
self.proposals[slot] = proposal
# find a leader we think is working, deterministically
leaders = [view_primary(self.viewid, self.peers)] + \
list(self.peers)
leader = (l for l in leaders if l not in self.peers_down).next()
self.logger.info("proposing %s at slot %d to leader %s" %
(proposal, slot, leader))
self.send([leader], 'PROPOSE', slot=slot, proposal=proposal)
def on_view_change_event(self, viewchange):
self.peers = viewchange.peers
is_primary = view_primary(viewchange.viewid, viewchange.peers) == self.address
self.is_primary = is_primary
if is_primary:
if not self.scout and not self.active:
self.spawn_scout()
else:
if self.scout:
self.scout.finished(False, None)
# .. which eventually calls self.preempted
elif self.active:
self.preempted(None)
