def on_accept(self,msg):
log.info('ACCEPTOR: start on_accept')
if msg.instance_number < self.accepted_lease.instance_number:
#acceptor dose not vote for values in outdated instance
log.info('ACCEPTOR: acceptor dose not vote for values in outdated instance')
m = Message(method=NACK,
instance_number=self.accepted_lease.instance_number)
elif msg.instance_number > self.accepted_lease.instance_number:
#acceptor has missed instance and votes for value
log.info('ACCEPTOR: acceptor has missed instance and votes for value')
self.last_lease.set_none()
self.accepted_lease.sid = msg.suggested_host
self.accepted_lease.timeout= msg.suggested_host_timeout
self.ballot = msg.ballot
self.accepted_lease.instance_number = msg.instance_number
#SEND ACK
m = Message(method=ACK,
instance_number=self.accepted_lease.instance_number,
suggested_host=self.accepted_lease.sid,
suggested_host_timeout=self.accepted_lease.timeout,
ballot=self.ballot)
elif msg.ballot >= self.ballot:
#acceptor votes for proposal
log.info('ACCEPTOR: acceptor has voted for proposal, now accept')
self.accepted_lease.sid = msg.suggested_host
self.accepted_lease.timeout = msg.suggested_host_timeout
#TODO
#maybe need to in on_accept, usually self.ballot was
#updated in on_prepare.
#self.ballot = msg.ballot
#SEND ACK
m = Message(method=ACK,
instance_number=self.accepted_lease.instance_number,
suggested_host=self.accepted_lease.sid,
suggested_host_timeout=self.accepted_lease.timeout,
ballot=msg.ballot)
else:
#acceptor has seen newer proposal and connot accept
#SEND NACK
log.info('ACCEPTOR: acceptor has seen newer proposal and connot accept')
m = Message(method=NACK,
instance_number=self.accepted_lease.instance_number)
m.add_sid(conf.myself.sid)
m.add_echo(msg.timestamp)
log.debug('ACCEPTOR: response from on_accept %s', m.enpack())
do_send(msg.sid, m.enpack())
def _notify_all(self, m):
m.add_sid(conf.myself.sid)
for server in conf.server_list.itervalues():
do_send(server.sid, m.enpack())
def on_prepare(self, msg):
#maybe RENEW and PREPARE
log.info('ACCEPTOR: start on_%s', msg.method)
log.debug('GET msg %s', msg)
#if msg.instance_number < self.accepted_lease.instance_number and self.last_lease.sid == None:
if msg.instance_number < self.accepted_lease.instance_number:
log.info('ACCEPTOR: proposer has missed some instance')
#proposer has missed some instance
m = Message(method=OUTDATE,
suggested_host=self.accepted_lease.sid,
suggested_host_timeout=self.accepted_lease.timeout,
ballot=self.ballot,
instance_number=self.accepted_lease.instance_number)
#SEND OUTDATE(None, local_lamda_acc, local_ballot,
#local_instance_nubmer
else:
if msg.instance_number > self.accepted_lease.instance_number:
#local acceptor has missed some instacne
#work instance_number or last lease instance_number?
if msg.method == RENEW and self.last_lease.sid and \
msg.instance_number == self.last_lease.instance_number + 1:
log.info('ACCEPTOR: agree to RENEW msg')
self.accepted_lease.sid = self.last_lease.sid
self.accepted_lease.timeout = self.last_lease.timeout
self.ballot = msg.ballot
self.accepted_lease.instance_number = msg.instance_number
m = Message(method=ACK,
ballot=msg.ballot,
instance_number=msg.instance_number,
suggested_host=self.accepted_lease.sid,
suggested_host_timeout=None)
else:
log.info('ACCEPTOR: local acceptor has missed some instacne')
self.accepted_lease.set_none()
self.last_lease.set_none()
self.ballot = msg.ballot
self.accepted_lease.instance_number = msg.instance_number
m = Message(method=ACK,
ballot=msg.ballot,
instance_number=msg.instance_number,
suggested_host=None,
suggested_host_timeout=None)
elif msg.ballot < self.ballot:
#acceptor has seen a newer proposal
log.info('ACCEPTOR: acceptor has seen a newer proposal')
m = Message(method=NACK,
ballot=self.ballot,
instance_number=self.accepted_lease.instance_number,
suggested_host=None,
suggested_host_timeout=None)
else:
#accept agree to the proposal
log.info('ACCEPTOR: accept agree to proposal')
self.ballot = msg.ballot
if self.accepted_lease.sid != None and \
self.accepted_lease.timeout != None:
#!!!acceptor force proposer to use prior value!!!
log.info('ACCEPTOR: acceptor force proposer to use prior value')
m = Message(method=ACK,
ballot=self.ballot,
instance_number=msg.instance_number,
suggested_host=self.accepted_lease.sid,
suggested_host_timeout=self.accepted_lease.timeout)
else:
log.info('ACCEPTOR: no accecpted lease , so accept this')
m = Message(method=ACK,
ballot=self.ballot,
instance_number=msg.instance_number,
suggested_host=None,
suggested_host_timeout=None)
#update dict to add sid
m.add_sid(conf.myself.sid)
m.add_echo(msg.timestamp)
do_send(msg.sid, m.enpack())
log.debug('ACCEPTOR: response from on_prepare %s', m.enpack())
