def setUp(self):
self.channel = HistoryChannel(replicas=['A', 'B', 'C'])
self.state = State(storage=InMemoryStorage("fakefile"))
self.ledger_storage = InMemoryStorage("fakefile2")
self.ledger = Ledger(storage=self.ledger_storage)
self.role = Learner(ledger=self.ledger, state=self.state)
class TestLearner(TestCase):
def setUp(self):
self.channel = HistoryChannel(replicas=['A', 'B', 'C'])
self.state = State(storage=InMemoryStorage("fakefile"))
self.ledger_storage = InMemoryStorage("fakefile2")
self.ledger = Ledger(storage=self.ledger_storage)
self.role = Learner(ledger=self.ledger, state=self.state)
def test_learner_receives_quorum_of_accepteds(self):
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='A'), self.channel)
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='B'), self.channel)
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='C'), self.channel)
self.assertTrue(type(self.channel.unicast_messages[0]) is Request)
self.assertTrue(type(self.channel.unicast_messages[1]) is Response)
def test_learner_receives_quorum_of_accepteds_causes_proposal_to_increment(self):
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='A'), self.channel)
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='B'), self.channel)
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='C'), self.channel)
self.assertTrue(self.state.read(Role.PROPOSED), Proposal('A', 2))
def test_learner_ignores_duplicate_accepteds(self):
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='A'), self.channel)
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='A'), self.channel)
self.role.receive(Accepted.create(proposal=Proposal('A', 1), sender='A'), self.channel)
self.assertFalse(self.channel.unicast_messages)
def test_learner_receives_sync(self):
self.ledger.append(LedgerEntry(number=1, value="value_1"))
self.ledger.append(LedgerEntry(number=2, value="value_2"))
self.ledger.append(LedgerEntry(number=3, value="value_3"))
self.role.receive(Sync.create(proposal=Proposal('A', 1), sender='A'), self.channel)
message = self.channel.unicast_messages[-1]
self.assert_equal(message.proposal[0], LedgerEntry(number=1, value="value_1"))
self.assert_equal(message.proposal[1], LedgerEntry(number=2, value="value_2"))
self.assert_equal(message.proposal[2], LedgerEntry(number=3, value="value_3"))
def test_learner_receives_synced(self):
proposals = [LedgerEntry(number=1, value="v_1"),
LedgerEntry(number=2, value="v_2"),
LedgerEntry(number=3, value="v_3")]
self.role.receive(Synced.create(proposal=proposals, sender='A'), self.channel)
def get_entry(line):
return LedgerEntry(*line.split(LedgerEntry.SEPARATOR))
self.assert_equal(get_entry(self.ledger_storage[0]), LedgerEntry(number=1, value="v_1"))
self.assert_equal(get_entry(self.ledger_storage[1]), LedgerEntry(number=2, value="v_2"))
self.assert_equal(get_entry(self.ledger_storage[2]), LedgerEntry(number=3, value="v_3"))
def test_learner_receives_synced_and_merges_results(self):
self.ledger_storage.append(str(LedgerEntry(number=1, value="v_1")))
proposals = [LedgerEntry(number=1, value="v_1"),
LedgerEntry(number=2, value="v_2"),
LedgerEntry(number=3, value="v_3")]
self.role.receive(Synced.create(proposal=proposals, sender='A'), self.channel)
def get_entry(line):
return LedgerEntry(*line.split(LedgerEntry.SEPARATOR))
self.assert_equal(get_entry(self.ledger_storage[0]), LedgerEntry(number=1, value="v_1"))
self.assert_equal(get_entry(self.ledger_storage[1]), LedgerEntry(number=2, value="v_2"))
self.assert_equal(get_entry(self.ledger_storage[2]), LedgerEntry(number=3, value="v_3"))
def test_learner_sync_messages(self):
for i in range(Learner.SYNC_SIZE + 1):
self.ledger.append(LedgerEntry(number=i, value="value_{0}".format(i)))
self.role.receive(Sync.create(proposal=Proposal('A', 1), sender='A'), self.channel)
message = self.channel.unicast_messages[-1]
self.assertEqual(Learner.SYNC_SIZE, len(message.proposal))
self.assertTrue(not message.finished)
def assert_equal(self, actual_entry, expected_entry):
self.assertEqual(actual_entry.number, expected_entry.number)
self.assertEqual(actual_entry.value, expected_entry.value)