mirror of
https://github.com/outbackdingo/patroni.git
synced 2026-09-03 10:09:19 +00:00
Alexander Kukushkin
0b288a7f3e
Drop replication slot when it was removed from etcd. Execute pg_create_physical_replication_slot only when something new appeared in etcd.
76 lines
1.9 KiB
Python
Executable File
76 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python
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import sys
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import yaml
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import time
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import urllib2
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import atexit
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import logging
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from helpers.etcd import Etcd
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from helpers.postgresql import Postgresql
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from helpers.ha import Ha
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logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s', level=logging.INFO)
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f = open(sys.argv[1], "r")
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config = yaml.load(f.read())
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f.close()
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etcd = Etcd(config["etcd"])
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postgresql = Postgresql(config["postgresql"])
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ha = Ha(postgresql, etcd)
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# stop postgresql on script exit
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def stop_postgresql():
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postgresql.stop()
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atexit.register(stop_postgresql)
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# wait for etcd to be available
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etcd_ready = False
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while not etcd_ready:
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try:
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etcd.touch_member(postgresql.name, postgresql.connection_string)
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etcd_ready = True
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except urllib2.URLError:
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logging.info("waiting on etcd")
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time.sleep(5)
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# is data directory empty?
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if postgresql.data_directory_empty():
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# racing to initialize
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if etcd.race("/initialize", postgresql.name):
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postgresql.initialize()
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etcd.take_leader(postgresql.name)
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postgresql.start()
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postgresql.create_replication_user()
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else:
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synced_from_leader = False
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while not synced_from_leader:
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leader = etcd.current_leader()
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if not leader:
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time.sleep(5)
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continue
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if postgresql.sync_from_leader(leader):
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postgresql.write_recovery_conf(leader)
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postgresql.start()
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synced_from_leader = True
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else:
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time.sleep(5)
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else:
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postgresql.write_recovery_conf(None)
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postgresql.start()
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while True:
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logging.info(ha.run_cycle())
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# create replication slots
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if postgresql.is_leader():
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members = [m['hostname'] for m in etcd.members() if m['hostname'] != postgresql.name]
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postgresql.create_replication_slots(members)
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time.sleep(config["loop_wait"])
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