async def test_replica_tries_to_take_over(app):
plugins = setup_plugins(app,
pg_replication_role='replica')
assert app.initialize() == None
plugins.reset_mock()
# if there is no lock owner, we start looping trying to become master
app.master_lock_changed(None)
assert app._plugins.mock_calls == [call.pg_replication_role()]
plugins.reset_mock()
from asyncio import sleep as real_sleep
with patch('asyncio.sleep') as sleep:
sleeper = FakeSleeper()
sleep.side_effect = sleeper
# the first thing is to sleep a bit
await sleeper.next()
assert sleeper.log == [3]
assert app._plugins.mock_calls == []
# takeover attempted
states = [(app.my_id, {})]
plugins.dcs_get_all_state.side_effect = iter_states = [iter(states)]
plugins.willing_replicas.side_effect = iter_willing_replicas = [iter(states)]
plugins.best_replicas.side_effect = iter_best_replicas = [iter(states)]
await sleeper.next()
assert sleeper.log == [3, 3]
assert app._plugins.mock_calls == [
call.dcs_get_all_state(),
call.willing_replicas(iter_states[0]),
call.best_replicas(iter_willing_replicas[0]),
call.dcs_lock('master')]
async def test_master_unhealthy(app):
plugins = setup_plugins(app,
pg_replication_role='master')
app.initialize()
plugins.reset_mock()
app.unhealthy('boom', 'It went Boom', can_be_replica=True)
assert plugins.mock_calls == [
call.dcs_set_state({
'host': '127.0.0.1',
'replication_role': 'master',
'health_problems': {'boom': {'reason': 'It went Boom', 'can_be_replica': True}}}),
call.pg_replication_role(),
call.dcs_delete_conn_info(),
]
plugins.reset_mock()
# now we should have _handle_unhealthy_master running
with patch('asyncio.sleep') as sleep, patch('sys.exit') as exit, patch('time.sleep') as blocking_sleep:
sleeper = FakeSleeper()
sleep.side_effect = sleeper
exit.side_effect = lambda x: sleeper.finish()
# there is no replica, so we just sleep and ping the
# DCS to find a willing replica
states = [iter([])]
plugins.dcs_get_all_state.side_effect = states
plugins.willing_replicas.side_effect = [iter([])]
await sleeper.next()
assert plugins.mock_calls == [
call.dcs_get_all_state(),
call.willing_replicas(states[0])]
# we add a willing replica
states = [iter([])]
plugins.dcs_get_all_state.side_effect = states
plugins.willing_replicas.side_effect = [iter([('other', {})])]
plugins.reset_mock()
await sleeper.next()
assert plugins.mock_calls == [
call.dcs_get_all_state(),
call.willing_replicas(states[0]),
call.pg_replication_role(),
call.pg_stop(),
call.dcs_disconnect()
]