def test_prepare(self):
prepare = Prepare(id=3, key='biz', predicate='set', argument='a')
self.assertEqual(prepare.to_json(), {
'id': 3,
'key': 'biz',
'predicate': 'set',
'argument': 'a'
})
target = Prepare._id
prepare = Prepare(key='buzz', predicate='a', argument='b')
self.assertEqual(prepare.to_json(), {
'id': target,
'key': 'buzz',
'predicate': 'a',
'argument': 'b'
})
_ = yield self.assert_send_works(prepare, '/prepare')
request = tornado.httpclient.HTTPRequest(
body=json.dumps(prepare.to_json()),
method='POST',
headers={'Content-Type': 'application/json'},
url='/prepare')
target = Prepare.from_request(request)
self.assertEqual(target.to_json(), prepare.to_json())
def post(self):
prepare = Prepare.from_request(self.request)
in_progress = Promises.current.get(prepare.key)
last_accepted = Learner.completed_rounds.highest_numbered(prepare.key)
if in_progress:
logger.info("Promise in progress already %s", in_progress)
if in_progress.prepare.id == prepare.id:
raise Exception("Prepare IDs match.")
if in_progress.prepare.id > prepare.id:
# Some replica has issued a higher promise
# than ours. Abort.
logger.warning("Existing promise is higher.")
self.respond(code=400, message=in_progress)
elif last_accepted is None or (
in_progress.prepare.id > last_accepted.prepare.id
): # >= since we could have just learned but not removed the existing process because this is all async
# Complete the in-progress promise first
# Possible for the incoming promise to have the same ID as the existing one.
logger.info("Must complete earlier promise first: %s",
in_progress)
self.respond(code=200, message=in_progress)
else:
logger.info("New promise is higher. Issuing promise.")
self.respond(code=200, message=Promise())
elif last_accepted is None or prepare.id > last_accepted.prepare.id:
logger.info("Adding a new promise for prepare %s", prepare)
Promises.current.add(Promise(prepare=prepare))
self.respond(code=200, message=Promise())
else:
logger.warning(
"Prepare has a lower ID than the last accepted proposal")
logger.warning("prepare: %s, last_accepted: %s", prepare,
last_accepted)
self.respond(code=400, message=last_accepted)