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92 lines
2.7 KiB
Python
Executable File
92 lines
2.7 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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INSTANCE_METADATA_URL = "http://169.254.169.254/latest/meta-data/"
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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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if config.get('aws_use_host_address', False):
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# get host address of the AWS host via a call to
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# http://169.254.169.254/latest/meta-data/local-ipv4
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try:
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aws_host_address = urllib2.urlopen(INSTANCE_METADATA_URL+"/local-ipv4").read()
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except (urllib2.HTTPError, urllib2.URLError) as e:
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logging.error("Error retrieiving IPv4 address from AWS instance: {0}".format(e))
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aws_host_address = None
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else:
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aws_host_address = None
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etcd = Etcd(config["etcd"])
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postgresql = Postgresql(config["postgresql"], aws_host_address)
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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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postgresql.create_connection_users()
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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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for member in etcd.members():
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if member['hostname'] != postgresql.name:
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postgresql.query("""SELECT pg_create_physical_replication_slot(%s)
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WHERE NOT EXISTS (SELECT 1 FROM pg_replication_slots
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WHERE slot_name = %s)""", member['hostname'], member['hostname'])
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time.sleep(config["loop_wait"])
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