def on_paxos_consensus(self, success, proposal):
pid = proposal['pid']
if pid not in self.pending_proposals:
# Ignore for now
return
memo = self.pending_proposals.pop(pid)
req, src_addr = memo['req'], memo['src_addr']
snapshot, sid = memo['snapshot'], memo['sid']
if success:
snapshot.commit(self)
cookie = (src_addr, req['tid'])
self.completed_transactions.add(cookie)
self.txn_journal.push(cookie)
self.last_sid = sid
req['result'] = True
else:
req['error'] = 'Paxos proposal rejected'
out = Serialization.encode(req)
print 'replying to %d: %r' % (src_addr, req)
self.RIOSend(src_addr, Protocol.CHITTER_RPC_REPLY, out)
def send_msg(self, dest_addr, msg, error_str="Message sending failed"):
try:
byte_msg = Serialization.encode(msg)
except Serialization.EncodingException as e:
print error_str
return
self.RIOSend(dest_addr, Protocol.PAXOS, byte_msg)
def pump_send_queue(self):
if self.send_queue.empty():
return
print 'send_queue: %r' % (self.send_queue,)
req = self.send_queue.get()
try:
payload = Serialization.encode(req)
if len(payload) != 0:
self.RIOSend(req['dest'], Protocol.CHITTER_RPC_REQUEST, payload)
except Serialization.EncodingException as e:
print 'failed to encode request'
def handle_request(self, src_addr, msg):
try:
req = Serialization.decode(msg)
print 'handle_request: %r' % (req,)
req = self.on_request(req, src_addr)
out = Serialization.encode(req)
if len(out) != 0 and req is not None:
print 'replying to %d: %r' % (src_addr, req)
self.RIOSend(src_addr, Protocol.CHITTER_RPC_REPLY, out)
except Serialization.DecodingException as e:
print 'failed to decode RPC request'
except Serialization.EncodingException as e:
print 'failed to encode RPC request'
def chit(self, username, text):
"""chit username text"""
chit = Chit(text)
content = None
try:
content = Serialization.encode(chit)
except Serialization.EncodingException as e:
yield False
content.append(ord("\n"))
tweets_fn = "tweets:" + username
with Transaction() as fs:
yield fs.begin()
if not (yield fs.append(tweets_fn, content)):
yield False
yield (yield fs.commit())
