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replica & async rest API health check enhancement (#1599)

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- ``GET /replica?lag=<max-lag>``: replica check endpoint.
- ``GET /asynchronous?lag=<max-lag>`` or ``GET /async&lag=<max-lag>``: asynchronous standby check endpoint.

Checks replication latency and returns status code **200** only when the latency is below a specified value. The key leader_optime from DCS is used for the leader WAL position and compute latency on the replica for performance reasons. Please note that the value in leader_optime might be a couple of seconds old (based on loop_wait).

Co-authored-by: Alexander Kukushkin <[email protected]>
This commit is contained in:
ksarabu1
2020-07-15 10:36:48 +02:00
committed by GitHub
co-authored by Alexander Kukushkin
parent 04b9fb9dd4
commit 8a62999eaa
4 changed files with 32 additions and 2 deletions
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tests/__init__.py
+1 -1
View File
@@ -93,7 +93,7 @@ class MockCursor(object):
elif sql.startswith('SELECT pg_catalog.to_char'):
replication_info = '[{"application_name":"walreceiver","client_addr":"1.2.3.4",' +\
'"state":"streaming","sync_state":"async","sync_priority":0}]'
self.results = [('', 0, '', '', '', '', False, replication_info)]
self.results = [('', 0, '', 0, '', '', False, replication_info)]
elif sql.startswith('SELECT name, setting'):
self.results = [('wal_segment_size', '2048', '8kB', 'integer', 'internal'),
('wal_block_size', '8192', None, 'integer', 'internal'),
tests/test_api.py
+4
View File
@@ -161,7 +161,11 @@ class TestRestApiHandler(unittest.TestCase):
_authorization = '\nAuthorization: Basic dGVzdDp0ZXN0'
def test_do_GET(self):
MockPatroni.dcs.cluster.last_leader_operation = 20
MockRestApiServer(RestApiHandler, 'GET /replica')
MockRestApiServer(RestApiHandler, 'GET /replica?lag=1M')
MockRestApiServer(RestApiHandler, 'GET /replica?lag=10MB')
MockRestApiServer(RestApiHandler, 'GET /replica?lag=10485760')
MockRestApiServer(RestApiHandler, 'GET /read-only')
with patch.object(RestApiHandler, 'get_postgresql_status', Mock(return_value={})):
MockRestApiServer(RestApiHandler, 'GET /replica')