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384705ad97549bf3863a7b74f2d4fc94bfdbcecc
patroni/tests/test_etcd.py
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Alexander KukushkinandGitHub 384705ad97 Quorum based failover (#2668) 
To enable quorum commit:
```diff
$ patronictl.py edit-config
--- 
+++ 
@@ -5,3 +5,4 @@
   use_pg_rewind: true
 retry_timeout: 10
 ttl: 30
+synchronous_mode: quorum

Apply these changes? [y/N]: y
Configuration changed
```

By default Patroni will use `ANY 1(list,of,stanbys)` in `synchronous_standby_names`. That is, only one node out of listed replicas will be used for quorum.
If you want to increase the number of quorum nodes it is possible to do it with:
```diff
$ patronictl edit-config
--- 
+++ 
@@ -6,3 +6,4 @@
 retry_timeout: 10
 synchronous_mode: quorum
 ttl: 30
+synchronous_node_count: 2

Apply these changes? [y/N]: y
Configuration changed
```

Good old `synchronous_mode: on` is still supported.

Close https://github.com/patroni/patroni/issues/664
Close https://github.com/zalando/patroni/pull/672
2024-08-13 08:51:01 +02:00

355 lines
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import etcd
import urllib3.util.connection
import socket
import unittest
from dns.exception import DNSException
from patroni.dcs import get_dcs
from patroni.dcs.etcd import AbstractDCS, EtcdClient, Cluster, Etcd, EtcdError, DnsCachingResolver
from patroni.exceptions import DCSError
from patroni.postgresql.mpp import get_mpp
from patroni.utils import Retry
from unittest.mock import Mock, PropertyMock, patch
from urllib3.exceptions import ReadTimeoutError
from . import SleepException, MockResponse, requests_get
def etcd_watch(self, key, index=None, timeout=None, recursive=None):
if timeout == 2.0:
raise etcd.EtcdWatchTimedOut
elif timeout == 5.0:
return etcd.EtcdResult('compareAndSwap', {})
elif 5 < timeout <= 10.0:
raise etcd.EtcdException
elif timeout == 20.0:
raise etcd.EtcdEventIndexCleared
def etcd_write(self, key, value, **kwargs):
if key == '/service/exists/leader':
raise etcd.EtcdAlreadyExist
if key in ['/service/test/leader', '/patroni/test/leader'] and \
(kwargs.get('prevValue') == 'foo' or not kwargs.get('prevExist', True)):
return True
raise etcd.EtcdException
def etcd_read(self, key, **kwargs):
if key == '/service/noleader/':
raise DCSError('noleader')
elif key == '/service/nocluster/':
raise etcd.EtcdKeyNotFound
response = {"action": "get", "node": {"key": "/service/batman5", "dir": True, "nodes": [
{"key": "/service/batman5/1", "dir": True, "nodes": [
{"key": "/service/batman5/1/initialize", "value": "2164261704",
"modifiedIndex": 20729, "createdIndex": 20729}],
"modifiedIndex": 20437, "createdIndex": 20437},
{"key": "/service/batman5/config", "value": '{"synchronous_mode": 0, "failsafe_mode": true}',
"modifiedIndex": 1582, "createdIndex": 1582},
{"key": "/service/batman5/failover", "value": "",
"modifiedIndex": 1582, "createdIndex": 1582},
{"key": "/service/batman5/initialize", "value": "postgresql0",
"modifiedIndex": 1582, "createdIndex": 1582},
{"key": "/service/batman5/leader", "value": "postgresql1",
"expiration": "2015-05-15T09:11:00.037397538Z", "ttl": 21,
"modifiedIndex": 20728, "createdIndex": 20434},
{"key": "/service/batman5/optime", "dir": True, "nodes": [
{"key": "/service/batman5/optime/leader", "value": "2164261704",
"modifiedIndex": 20729, "createdIndex": 20729}],
"modifiedIndex": 20437, "createdIndex": 20437},
{"key": "/service/batman5/sync", "value": '{"leader": "leader"}',
"modifiedIndex": 1582, "createdIndex": 1582},
{"key": "/service/batman5/members", "dir": True, "nodes": [
{"key": "/service/batman5/members/postgresql1",
"value": "postgres://replicator:[email protected]:5434/postgres"
+ "?application_name=http://127.0.0.1:8009/patroni",
"expiration": "2015-05-15T09:10:59.949384522Z", "ttl": 21,
"modifiedIndex": 20727, "createdIndex": 20727},
{"key": "/service/batman5/members/postgresql0",
"value": "postgres://replicator:[email protected]:5433/postgres"
+ "?application_name=http://127.0.0.1:8008/patroni",
"expiration": "2015-05-15T09:11:09.611860899Z", "ttl": 30,
"modifiedIndex": 20730, "createdIndex": 20730}],
"modifiedIndex": 1581, "createdIndex": 1581},
{"key": "/service/batman5/failsafe", "value": '{', "modifiedIndex": 1582, "createdIndex": 1582},
{"key": "/service/batman5/status", "value": '{"optime":2164261704,"slots":{"ls":12345}}',
"modifiedIndex": 1582, "createdIndex": 1582}], "modifiedIndex": 1581, "createdIndex": 1581}}
if key == '/service/legacy/':
response['node']['nodes'].pop()
if key == '/service/broken/':
response['node']['nodes'][-1]['value'] = '{'
result = etcd.EtcdResult(**response)
result.etcd_index = 0
return result
def dns_query(name, _):
if '-server' not in name or '-ssl' in name:
return []
if name == '_etcd-server._tcp.blabla':
return []
elif name == '_etcd-server._tcp.exception':
raise DNSException()
srv = Mock()
srv.port = 2380
srv.target.to_text.return_value = \
'localhost' if name in ['_etcd-server._tcp.foobar', '_etcd-server-baz._tcp.foobar'] else '127.0.0.1'
return [srv]
def socket_getaddrinfo(*args):
if args[0] in ('ok', 'localhost', '127.0.0.1'):
return [(socket.AF_INET, 1, 6, '', ('127.0.0.1', 0)), (socket.AF_INET6, 1, 6, '', ('::1', 0))]
raise socket.gaierror
def http_request(method, url, **kwargs):
if url == 'http://localhost:2379/timeout':
raise ReadTimeoutError(None, None, None)
ret = MockResponse()
if url == 'http://localhost:2379/v2/machines':
ret.content = 'http://localhost:2379,http://localhost:4001'
elif url == 'http://localhost:4001/v2/machines':
ret.content = ''
elif url != 'http://localhost:2379/':
raise socket.error
return ret
class TestDnsCachingResolver(unittest.TestCase):
@patch('time.sleep', Mock(side_effect=SleepException))
@patch('socket.getaddrinfo', Mock(side_effect=socket.gaierror))
def test_run(self):
r = DnsCachingResolver()
r._invoke_excepthook = Mock()
self.assertIsNone(r.resolve_async('', 0))
r.join()
@patch('dns.resolver.query', dns_query)
@patch('socket.getaddrinfo', socket_getaddrinfo)
@patch('patroni.dcs.etcd.requests_get', requests_get)
class TestClient(unittest.TestCase):
@patch('dns.resolver.query', dns_query)
@patch('socket.getaddrinfo', socket_getaddrinfo)
@patch('patroni.dcs.etcd.requests_get', requests_get)
@patch.object(EtcdClient, '_get_machines_list',
Mock(return_value=['http://localhost:2379', 'http://localhost:4001']))
def setUp(self):
self.etcd = get_dcs({'namespace': '/patroni/', 'ttl': 30, 'retry_timeout': 3,
'etcd': {'srv': 'test'}, 'scope': 'test', 'name': 'foo'})
self.assertIsInstance(self.etcd, Etcd)
self.client = self.etcd._client
self.client.http.request = http_request
self.client.http.request_encode_body = http_request
def test_machines(self):
self.client._base_uri = 'http://localhost:4002'
self.client._machines_cache = ['http://localhost:4002', 'http://localhost:2379']
self.assertIsNotNone(self.client.machines)
self.client._base_uri = 'http://localhost:4001'
self.client._machines_cache = ['http://localhost:4001']
self.client._update_machines_cache = True
machines = None
try:
machines = self.client.machines
self.assertFail()
except Exception:
self.assertIsNone(machines)
@patch.object(EtcdClient, '_get_machines_list',
Mock(return_value=['http://localhost:4001', 'http://localhost:2379']))
def test_api_execute(self):
self.client._base_uri = 'http://localhost:4001'
self.assertRaises(etcd.EtcdException, self.client.api_execute, '/', 'POST', timeout=0)
self.client._base_uri = 'http://localhost:4001'
rtry = Retry(deadline=10, max_delay=1, max_tries=-1, retry_exceptions=(etcd.EtcdLeaderElectionInProgress,))
rtry(self.client.api_execute, '/', 'POST', timeout=0, params={'retry': rtry})
self.client._machines_cache_updated = 0
self.client.api_execute('/', 'POST', timeout=0)
self.client._machines_cache = [self.client._base_uri]
self.assertRaises(etcd.EtcdWatchTimedOut, self.client.api_execute, '/timeout', 'POST', params={'wait': 'true'})
self.assertRaises(etcd.EtcdWatchTimedOut, self.client.api_execute, '/timeout', 'POST', params={'wait': 'true'})
with patch.object(EtcdClient, '_calculate_timeouts', Mock(side_effect=[(1, 1, 0), (1, 1, 0), (0, 1, 0)])), \
patch.object(EtcdClient, '_load_machines_cache', Mock(side_effect=Exception)):
self.client.http.request = Mock(side_effect=socket.error)
self.assertRaises(etcd.EtcdException, rtry, self.client.api_execute, '/', 'GET', params={'retry': rtry})
with patch.object(EtcdClient, '_calculate_timeouts', Mock(side_effect=[(1, 1, 0), (1, 1, 0), (0, 1, 0)])), \
patch.object(EtcdClient, '_load_machines_cache', Mock(return_value=True)):
self.assertRaises(etcd.EtcdException, rtry, self.client.api_execute, '/', 'GET', params={'retry': rtry})
with patch.object(EtcdClient, '_do_http_request', Mock(side_effect=etcd.EtcdException)):
self.client._read_timeout = 0.01
self.assertRaises(etcd.EtcdException, self.client.api_execute, '/', 'GET')
def test_get_srv_record(self):
self.assertEqual(self.client.get_srv_record('_etcd-server._tcp.blabla'), [])
self.assertEqual(self.client.get_srv_record('_etcd-server._tcp.exception'), [])
def test__get_machines_cache_from_srv(self):
self.client._get_machines_cache_from_srv('foobar')
self.client._get_machines_cache_from_srv('foobar', 'baz')
self.client.get_srv_record = Mock(return_value=[('localhost', 2380)])
self.client._get_machines_cache_from_srv('blabla')
def test__get_machines_cache_from_dns(self):
self.client._get_machines_cache_from_dns('error', 2379)
@patch.object(EtcdClient, '_get_machines_list', Mock(side_effect=etcd.EtcdConnectionFailed))
def test__refresh_machines_cache(self):
self.assertFalse(self.client._refresh_machines_cache())
self.assertRaises(etcd.EtcdException, self.client._refresh_machines_cache, ['http://localhost:2379'])
def test__load_machines_cache(self):
self.client._config = {}
self.assertRaises(Exception, self.client._load_machines_cache)
self.client._config = {'srv': 'blabla'}
self.assertRaises(etcd.EtcdException, self.client._load_machines_cache)
@patch.object(socket.socket, 'connect')
def test_create_connection_patched(self, mock_connect):
self.assertRaises(socket.error, urllib3.util.connection.create_connection, ('fail', 2379))
urllib3.util.connection.create_connection(('[localhost]', 2379))
mock_connect.side_effect = socket.error
self.assertRaises(socket.error, urllib3.util.connection.create_connection, ('[localhost]', 2379),
timeout=1, source_address=('localhost', 53333),
socket_options=[(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)])
def test___del__(self):
self.client.http.clear = Mock(side_effect=TypeError)
del self.client
@patch('patroni.dcs.etcd.requests_get', requests_get)
@patch('socket.getaddrinfo', socket_getaddrinfo)
@patch.object(etcd.Client, 'write', etcd_write)
@patch.object(etcd.Client, 'read', etcd_read)
@patch.object(etcd.Client, 'delete', Mock(side_effect=etcd.EtcdException))
class TestEtcd(unittest.TestCase):
@patch('socket.getaddrinfo', socket_getaddrinfo)
@patch.object(EtcdClient, '_get_machines_list',
Mock(return_value=['http://localhost:2379', 'http://localhost:4001']))
def setUp(self):
self.etcd = Etcd({'namespace': '/patroni/', 'ttl': 30, 'retry_timeout': 10,
'host': 'localhost:2379', 'scope': 'test', 'name': 'foo'}, get_mpp({}))
def test_base_path(self):
self.assertEqual(self.etcd._base_path, '/patroni/test')
@patch('dns.resolver.query', dns_query)
@patch('time.sleep', Mock(side_effect=SleepException))
@patch.object(EtcdClient, '_get_machines_list', Mock(side_effect=etcd.EtcdConnectionFailed))
def test_get_etcd_client(self):
self.assertRaises(SleepException, self.etcd.get_etcd_client,
{'discovery_srv': 'test', 'retry_timeout': 10, 'cacert': '1', 'key': '1', 'cert': 1},
EtcdClient)
self.assertRaises(SleepException, self.etcd.get_etcd_client,
{'url': 'https://test:2379', 'retry_timeout': 10}, EtcdClient)
self.assertRaises(SleepException, self.etcd.get_etcd_client,
{'hosts': 'foo:4001,bar', 'retry_timeout': 10}, EtcdClient)
with patch.object(EtcdClient, '_get_machines_list', Mock(return_value=[])):
self.assertRaises(SleepException, self.etcd.get_etcd_client,
{'proxy': 'https://user:password@test:2379', 'retry_timeout': 10}, EtcdClient)
def test_get_cluster(self):
cluster = self.etcd.get_cluster()
self.assertIsInstance(cluster, Cluster)
self.etcd._base_path = '/service/legacy'
self.assertIsInstance(self.etcd.get_cluster(), Cluster)
self.etcd._base_path = '/service/broken'
self.assertIsInstance(self.etcd.get_cluster(), Cluster)
self.etcd._base_path = '/service/nocluster'
cluster = self.etcd.get_cluster()
self.assertIsInstance(cluster, Cluster)
self.assertIsNone(cluster.leader)
self.etcd._base_path = '/service/noleader'
self.assertRaises(EtcdError, self.etcd.get_cluster)
def test__get_citus_cluster(self):
self.etcd._mpp = get_mpp({'citus': {'group': 0, 'database': 'postgres'}})
cluster = self.etcd.get_cluster()
self.assertIsInstance(cluster, Cluster)
self.assertIsInstance(cluster.workers[1], Cluster)
self.etcd._base_path = '/service/nocluster'
self.assertTrue(self.etcd.get_cluster().is_empty())
def test_touch_member(self):
self.assertFalse(self.etcd.touch_member(''))
def test_take_leader(self):
self.assertFalse(self.etcd.take_leader())
def test_attempt_to_acquire_leader(self):
self.etcd._base_path = '/service/exists'
self.assertFalse(self.etcd.attempt_to_acquire_leader())
self.etcd._base_path = '/service/failed'
self.assertFalse(self.etcd.attempt_to_acquire_leader())
with patch.object(EtcdClient, 'write', Mock(side_effect=[etcd.EtcdConnectionFailed, Exception])):
self.assertRaises(EtcdError, self.etcd.attempt_to_acquire_leader)
self.assertRaises(EtcdError, self.etcd.attempt_to_acquire_leader)
@patch.object(Cluster, 'min_version', PropertyMock(return_value=(2, 0)))
def test_write_leader_optime(self):
self.etcd.get_cluster()
self.etcd.write_leader_optime('0')
def test_update_leader(self):
cluster = self.etcd.get_cluster()
self.assertTrue(self.etcd.update_leader(cluster, None, failsafe={'foo': 'bar'}))
with patch.object(etcd.Client, 'write',
Mock(side_effect=[etcd.EtcdConnectionFailed, etcd.EtcdClusterIdChanged, Exception])):
self.assertRaises(EtcdError, self.etcd.update_leader, cluster, None)
self.assertFalse(self.etcd.update_leader(cluster, None))
self.assertRaises(EtcdError, self.etcd.update_leader, cluster, None)
with patch.object(etcd.Client, 'write', Mock(side_effect=etcd.EtcdKeyNotFound)):
self.assertFalse(self.etcd.update_leader(cluster, None))
def test_initialize(self):
self.assertFalse(self.etcd.initialize())
def test_cancel_initializion(self):
self.assertFalse(self.etcd.cancel_initialization())
def test_delete_leader(self):
self.assertFalse(self.etcd.delete_leader(self.etcd.get_cluster().leader))
def test_delete_cluster(self):
self.assertFalse(self.etcd.delete_cluster())
@patch('time.sleep', Mock(side_effect=SleepException))
@patch.object(etcd.Client, 'watch', etcd_watch)
def test_watch(self):
self.etcd.watch(None, 0)
self.etcd.get_cluster()
self.etcd.watch(20729, 1.5)
with patch('time.sleep', Mock()):
self.etcd.watch(20729, 4.5)
with patch.object(AbstractDCS, 'watch', Mock()):
self.assertTrue(self.etcd.watch(20729, 19.5))
self.assertRaises(SleepException, self.etcd.watch, 20729, 9.5)
def test_other_exceptions(self):
self.etcd.retry = Mock(side_effect=AttributeError('foo'))
self.assertRaises(EtcdError, self.etcd.cancel_initialization)
def test_set_ttl(self):
self.etcd.set_ttl(20)
self.assertTrue(self.etcd.watch(None, 1))
def test_sync_state(self):
self.assertIsNone(self.etcd.write_sync_state('leader', None, 0))
self.assertFalse(self.etcd.delete_sync_state())
def test_set_history_value(self):
self.assertFalse(self.etcd.set_history_value('{}'))
def test_last_seen(self):
self.assertIsNotNone(self.etcd.last_seen)
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