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import os
from unittest.mock import Mock, patch
from patroni import global_config
from patroni.collections import CaseInsensitiveSet
from patroni.dcs import Cluster, ClusterConfig, Status, SyncState
from patroni.postgresql import Postgresql
from . import BaseTestPostgresql, mock_available_gucs, psycopg_connect
@patch('subprocess.call', Mock(return_value=0))
@patch('patroni.psycopg.connect', psycopg_connect)
@patch.object(Postgresql, 'available_gucs', mock_available_gucs)
class TestSync(BaseTestPostgresql):
@patch('subprocess.call', Mock(return_value=0))
@patch('os.rename', Mock())
@patch('patroni.postgresql.CallbackExecutor', Mock())
@patch.object(Postgresql, 'get_major_version', Mock(return_value=140000))
@patch.object(Postgresql, 'is_running', Mock(return_value=True))
@patch.object(Postgresql, 'available_gucs', mock_available_gucs)
def setUp(self):
super(TestSync, self).setUp()
self.p.config.write_postgresql_conf()
self.s = self.p.sync_handler
config = ClusterConfig(1, {'synchronous_mode': True}, 1)
self.cluster = Cluster(True, config, self.leader, Status.empty(), [self.me, self.other, self.leadermem],
None, SyncState(0, self.me.name, self.leadermem.name, 0), None, None, None)
global_config.update(self.cluster)
@patch.object(Postgresql, 'last_operation', Mock(return_value=1))
def test_pick_sync_standby(self):
pg_stat_replication = [
{'pid': 100, 'application_name': self.leadermem.name, 'sync_state': 'sync', 'flush_lsn': 1},
{'pid': 101, 'application_name': self.me.name, 'sync_state': 'async', 'flush_lsn': 2},
{'pid': 102, 'application_name': self.other.name, 'sync_state': 'async', 'flush_lsn': 2}]
# sync node is a bit behind of async, but we prefer it anyway
with patch.object(Postgresql, "_cluster_info_state_get", side_effect=[self.leadermem.name,
'on', pg_stat_replication]):
self.assertEqual(self.s.current_state(self.cluster), ('priority', 1,
CaseInsensitiveSet([self.leadermem.name]),
CaseInsensitiveSet([self.leadermem.name]),
CaseInsensitiveSet([self.leadermem.name])))
# prefer node with sync_state='potential', even if it is slightly behind of async
pg_stat_replication[0]['sync_state'] = 'potential'
for r in pg_stat_replication:
r['write_lsn'] = r.pop('flush_lsn')
with patch.object(Postgresql, "_cluster_info_state_get", side_effect=['', 'remote_write', pg_stat_replication]):
self.assertEqual(self.s.current_state(self.cluster), ('off', 0, CaseInsensitiveSet(), CaseInsensitiveSet(),
CaseInsensitiveSet([self.leadermem.name])))
# when there are no sync or potential candidates we pick async with the minimal replication lag
for i, r in enumerate(pg_stat_replication):
r.update(replay_lsn=3 - i, application_name=r['application_name'].upper())
missing = pg_stat_replication.pop(0)
with patch.object(Postgresql, "_cluster_info_state_get", side_effect=['', 'remote_apply', pg_stat_replication]):
self.assertEqual(self.s.current_state(self.cluster), ('off', 0, CaseInsensitiveSet(), CaseInsensitiveSet(),
CaseInsensitiveSet([self.me.name])))
# unknown sync node is ignored
missing.update(application_name='missing', sync_state='sync')
pg_stat_replication.insert(0, missing)
with patch.object(Postgresql, "_cluster_info_state_get", side_effect=['', 'remote_apply', pg_stat_replication]):
self.assertEqual(self.s.current_state(self.cluster), ('off', 0, CaseInsensitiveSet(), CaseInsensitiveSet(),
CaseInsensitiveSet([self.me.name])))
# invalid synchronous_standby_names and empty pg_stat_replication
with patch.object(Postgresql, "_cluster_info_state_get", side_effect=['a b', 'remote_apply', None]):
self.p._major_version = 90400
self.assertEqual(self.s.current_state(self.cluster), ('off', 0, CaseInsensitiveSet(), CaseInsensitiveSet(),
CaseInsensitiveSet()))
@patch.object(Postgresql, 'last_operation', Mock(return_value=1))
def test_current_state_quorum(self):
self.cluster.config.data['synchronous_mode'] = 'quorum'
global_config.update(self.cluster)
pg_stat_replication = [
{'pid': 100, 'application_name': self.leadermem.name, 'sync_state': 'quorum', 'flush_lsn': 1},
{'pid': 101, 'application_name': self.me.name, 'sync_state': 'quorum', 'flush_lsn': 2}]
# sync node is a bit behind of async, but we prefer it anyway
with patch.object(Postgresql, "_cluster_info_state_get",
side_effect=['ANY 1 ({0},"{1}")'.format(self.leadermem.name, self.me.name),
'on', pg_stat_replication]):
self.assertEqual(self.s.current_state(self.cluster),
('quorum', 1, CaseInsensitiveSet([self.me.name, self.leadermem.name]),
CaseInsensitiveSet([self.me.name, self.leadermem.name]),
CaseInsensitiveSet([self.leadermem.name, self.me.name])))
@patch.object(Postgresql, 'last_operation', Mock(return_value=1))
def test_current_state_cascading(self):
pg_stat_replication = [
{'pid': 100, 'application_name': self.me.name, 'sync_state': 'async', 'flush_lsn': 1},
{'pid': 101, 'application_name': self.other.name, 'sync_state': 'sync', 'flush_lsn': 2}]
# nodes that are supposed to replicate from other standby nodes are not
# returned if at least one standby in a chain is streaming from primary
self.leadermem.data['tags'] = {'replicatefrom': self.me.name}
with patch.object(Postgresql, "_cluster_info_state_get",
side_effect=['2 ({0},"{1}")'.format(self.leadermem.name, self.other.name),
'on', pg_stat_replication]):
self.assertEqual(self.s.current_state(self.cluster),
('priority', 2, CaseInsensitiveSet([self.other.name, self.leadermem.name]),
CaseInsensitiveSet(), CaseInsensitiveSet([self.me.name])))
@patch('time.sleep', Mock())
def test_set_sync_standby(self):
def value_in_conf():
with open(os.path.join(self.p.data_dir, 'postgresql.conf')) as f:
for line in f:
if line.startswith('synchronous_standby_names'):
return line.strip()
mock_reload = self.p.reload = Mock()
self.s.set_synchronous_standby_names(CaseInsensitiveSet(['n1']))
self.assertEqual(value_in_conf(), "synchronous_standby_names = 'n1'")
mock_reload.assert_called()
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(CaseInsensitiveSet(['n1']))
mock_reload.assert_not_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = 'n1'")
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(CaseInsensitiveSet(['n1', 'n2']))
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = '2 (n1,n2)'")
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(CaseInsensitiveSet([]))
mock_reload.assert_called()
self.assertEqual(value_in_conf(), None)
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(CaseInsensitiveSet('*'))
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = '*'")
self.cluster.config.data['synchronous_mode'] = 'quorum'
global_config.update(self.cluster)
mock_reload.reset_mock()
self.s.set_synchronous_standby_names([], 1)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = 'ANY 1 (*)'")
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(['any', 'b'], 1)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = 'ANY 1 (\"any\",b)'")
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(['a', 'b'], 3)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = 'ANY 3 (a,b)'")
self.p._major_version = 90601
mock_reload.reset_mock()
self.s.set_synchronous_standby_names([], 1)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = '1 (*)'")
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(['a', 'b'], 1)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = '1 (a,b)'")
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(['a', 'b'], 3)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = '3 (a,b)'")
self.p._major_version = 90501
mock_reload.reset_mock()
self.s.set_synchronous_standby_names([], 1)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = '*'")
mock_reload.reset_mock()
self.s.set_synchronous_standby_names(['a-1'], 1)
mock_reload.assert_called()
self.assertEqual(value_in_conf(), "synchronous_standby_names = '\"a-1\"'")
@patch.object(Postgresql, 'last_operation', Mock(return_value=1))
def test_do_not_prick_yourself(self):
self.p.name = self.leadermem.name
cluster = Cluster(True, None, self.leader, 0, [self.me, self.other, self.leadermem], None,
SyncState(0, self.me.name, self.leadermem.name, 0), None, None, None)
pg_stat_replication = [
{'pid': 100, 'application_name': self.leadermem.name, 'sync_state': 'sync', 'flush_lsn': 1},
{'pid': 101, 'application_name': self.me.name, 'sync_state': 'async', 'flush_lsn': 2},
{'pid': 102, 'application_name': self.other.name, 'sync_state': 'async', 'flush_lsn': 2}]
# Faulty case, application_name of the current primary is in synchronous_standby_names and in
# the pg_stat_replication. We need to check that primary is not selected as the synchronous node.
with patch.object(Postgresql, "_cluster_info_state_get", side_effect=[self.leadermem.name,
'on', pg_stat_replication]):
self.assertEqual(self.s.current_state(cluster), ('priority', 1, CaseInsensitiveSet([self.leadermem.name]),
CaseInsensitiveSet(), CaseInsensitiveSet([self.me.name])))
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