def switch_to_candidate(self):
"""Switch to candidate state.
Increment the current term, vote for self, and broadcast a
request vote. The election timeout is randomly reinitialized.
"""
if self._current_state == ServerState._LEADER:
raise InvalidState(
"Invalid state '%s' while transiting to candidate state." %
self._current_state)
self._current_term += 1
self._current_state = ServerState._CANDIDATE
LOG.debug("switched to candidate, term='%d'" % self._current_term)
self._voters.clear()
self._voters.add(self._private_endpoint)
self._voted_for = self._private_endpoint
l_l_i, l_l_t = self._log.index_and_term_of_last_entry()
rv_message = message.build_request_vote(self._current_term, l_l_i,
l_l_t)
# Broadcast request vote and reset election timeout.
self._server.broadcast_message(rv_message)
self._server.reset_election_timeout()
def switch_to_candidate(self):
"""Switch to candidate state.
Increment the current term, vote for self, and broadcast a
request vote. The election timeout is randomly reinitialized.
"""
if self._current_state == ServerState._LEADER:
raise InvalidState(
"Invalid state '%s' while transiting to candidate state." %
self._current_state)
self._current_term += 1
self._current_state = ServerState._CANDIDATE
LOG.debug("switched to candidate, term='%d'" % self._current_term)
self._voters.clear()
self._voters.add(self._private_endpoint)
self._voted_for = self._private_endpoint
l_l_i, l_l_t = self._log.index_and_term_of_last_entry()
rv_message = message.build_request_vote(self._current_term, l_l_i,
l_l_t)
# Broadcast request vote and reset election timeout.
self._server.broadcast_message(rv_message)
self._server.reset_election_timeout()
def test_process_internal_raft_message(self):
self.server._process_append_entry_request = mock.Mock()
self.server._process_append_entry_response = mock.Mock()
self.server._process_request_vote = mock.Mock()
self.server._process_request_vote_response = mock.Mock()
mock_socket = mock.Mock(spec=zmq.sugar.socket.Socket)
# Append entry request.
aereq = (1, 2, 3, 4, ())
aereq_packed = message.build_append_entry_request(*aereq)
mock_socket.recv_multipart.return_value = ("identifier", aereq_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_append_entry_request.assert_called_once_with(
"identifier", *aereq)
# Append entry response.
aeresp = (1, True, 0, None)
aeresp_packed = message.build_append_entry_response(*aeresp)
mock_socket.recv_multipart.return_value = ("identifier", aeresp_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_append_entry_response.\
assert_called_once_with("identifier", *aeresp)
# Request vote.
rv = (1, 2, 3)
rv_packed = message.build_request_vote(*rv)
mock_socket.recv_multipart.return_value = ("identifier", rv_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_request_vote.assert_called_once_with(
"identifier", *rv)
# Request vote response.
rvresp = (0, False)
rvresp_packed = message.build_request_vote_response(*rvresp)
mock_socket.recv_multipart.return_value = ("identifier", rvresp_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_request_vote_response.\
assert_called_once_with("identifier", *rvresp)
def test_process_internal_raft_message(self):
self.server._process_append_entry_request = mock.Mock()
self.server._process_append_entry_response = mock.Mock()
self.server._process_request_vote = mock.Mock()
self.server._process_request_vote_response = mock.Mock()
mock_socket = mock.Mock(spec=zmq.sugar.socket.Socket)
# Append entry request.
aereq = (1, 2, 3, 4, ())
aereq_packed = message.build_append_entry_request(*aereq)
mock_socket.recv_multipart.return_value = ("identifier", aereq_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_append_entry_request.assert_called_once_with(
"identifier", *aereq)
# Append entry response.
aeresp = (1, True, 0, None)
aeresp_packed = message.build_append_entry_response(*aeresp)
mock_socket.recv_multipart.return_value = ("identifier", aeresp_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_append_entry_response.\
assert_called_once_with("identifier", *aeresp)
# Request vote.
rv = (1, 2, 3)
rv_packed = message.build_request_vote(*rv)
mock_socket.recv_multipart.return_value = ("identifier", rv_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_request_vote.assert_called_once_with(
"identifier", *rv)
# Request vote response.
rvresp = (0, False)
rvresp_packed = message.build_request_vote_response(*rvresp)
mock_socket.recv_multipart.return_value = ("identifier", rvresp_packed)
self.server._process_internal_message(mock_socket, zmq.POLLIN)
self.server._process_request_vote_response.\
assert_called_once_with("identifier", *rvresp)
def test_switch_to_candidate(self):
self.server_state._current_state = serverstate.ServerState._LEADER
pytest.raises(serverstate.InvalidState,
self.server_state.switch_to_candidate)
self.server_state._current_state = serverstate.ServerState._FOLLOWER
self.log.index_and_term_of_last_entry.return_value = (0, 0)
current_term = self.server_state._current_term
self.server_state.switch_to_candidate()
assert self.server_state._current_term == current_term + 1
assert (self.server_state._voters ==
{self.server_state._private_endpoint})
assert self.server_state._current_state == \
serverstate.ServerState._CANDIDATE
assert (self.server_state._voted_for ==
self.server_state._private_endpoint)
rv = message.build_request_vote(self.server_state._current_term, 0, 0)
self.server.broadcast_message.assert_called_once_with(rv)
self.server.reset_election_timeout.assert_called_once_with()
def test_build_request_vote():
test_params = (0, 1, 2)
rv_message = message.build_request_vote(*test_params)
decoded_message = message.decode_message(rv_message)
assert (message.REQUEST_VOTE, test_params) == decoded_message
