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Feature: synchronous replicas priority
We should check that we can give nodes priority for becoming synchronous replicas
Scenario: check replica with sync_priority=0 does not become a synchronous replica
Given I start postgres-0
Then postgres-0 is a leader after 10 seconds
And there is a non empty initialize key in DCS after 15 seconds
When I issue a PATCH request to http://127.0.0.1:8008/config with {"ttl": 20, "synchronous_mode": true}
Then I receive a response code 200
When I configure and start postgres-1 with a tag sync_priority 0
Then sync key in DCS has leader=postgres-0 after 20 seconds
And sync key in DCS has sync_standby=None after 5 seconds
Scenario: check higher synchronous replicas priority is respected
Given I configure and start postgres-2 with a tag sync_priority 1
And I configure and start postgres-3 with a tag sync_priority 2
Then replication works from postgres-0 to postgres-2 after 20 seconds
And replication works from postgres-0 to postgres-3 after 20 seconds
When I issue a PATCH request to http://127.0.0.1:8008/config with {"synchronous_node_count": 1}
Then I receive a response code 200
And sync key in DCS has sync_standby=postgres-3 after 10 seconds
Scenario: check conflicting configuration handling
When I set nosync tag in postgres-3 config
And I issue an empty POST request to http://127.0.0.1:8011/reload
Then I receive a response code 202
And there is one of ["Conflicting configuration between nosync: True and sync_priority: 2. Defaulting to nosync: True"] WARNING in the postgres-3 patroni log after 5 seconds
And "members/postgres-3" key in DCS has tags={'nosync': True, 'sync_priority': '2'} after 10 seconds
And "sync" key in DCS has sync_standby=postgres-2 after 10 seconds
When I reset nosync tag in postgres-1 config
And I issue an empty POST request to http://127.0.0.1:8009/reload
Then I receive a response code 202
And there is one of ["Conflicting configuration between nosync: False and sync_priority: 0. Defaulting to nosync: False"] WARNING in the postgres-1 patroni log after 5 seconds
And "members/postgres-1" key in DCS has tags={'nosync': False, 'sync_priority': '0'} after 10 seconds
When I shut down postgres-2
And "sync" key in DCS has sync_standby=postgres-1 after 3 seconds
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