mirror of
https://github.com/outbackdingo/patroni.git
synced 2026-08-25 14:53:37 +00:00
74 lines
2.9 KiB
Python
74 lines
2.9 KiB
Python
import fcntl
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import json
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import logging
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import psycopg2
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from six.moves.BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
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from six.moves.socketserver import ThreadingMixIn
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from threading import Thread
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logger = logging.getLogger(__name__)
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class RestApiHandler(BaseHTTPRequestHandler):
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def do_GET(self):
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response = self.get_postgresql_status()
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path = '/master' if self.path == '/' else self.path
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status_code = 200 if response['running'] and 'role' in response and response['role'] in path else 503
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self.send_response(status_code)
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self.send_header('Content-Type', 'application/json')
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self.end_headers()
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self.wfile.write(json.dumps(response).encode('utf-8'))
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def get_postgresql_status(self):
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try:
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row = self.server.query("""SELECT to_char(pg_postmaster_start_time(), 'YYYY-MM-DD HH24:MI:SS.MS TZ'),
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pg_is_in_recovery(),
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CASE WHEN pg_is_in_recovery()
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THEN null
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ELSE pg_current_xlog_location() END,
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pg_last_xlog_receive_location(),
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pg_last_xlog_replay_location(),
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pg_is_in_recovery() AND pg_is_xlog_replay_paused()""")[0]
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return {
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'running': True,
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'postmaster_start_time': row[0],
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'role': 'slave' if row[1] else 'master',
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'xlog': ({
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'received_location': row[3],
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'replayed_location': row[4],
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'paused': row[5]} if row[1] else {
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'location': row[2]
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})
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}
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except (psycopg2.OperationalError, psycopg2.InterfaceError):
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logger.exception('get_postgresql_status')
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return {'running': self.server.patroni.postgresql.is_running()}
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class RestApiServer(ThreadingMixIn, HTTPServer, Thread):
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def __init__(self, patroni, config):
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self.connection_string = 'http://{}/patroni'.format(config.get('connect_address', None) or config['listen'])
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host, port = config['listen'].split(':')
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HTTPServer.__init__(self, (host, int(port)), RestApiHandler)
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Thread.__init__(self, target=self.serve_forever)
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self._set_fd_cloexec(self.socket)
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self.patroni = patroni
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self.daemon = True
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def query(self, sql, *params):
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cursor = self.patroni.postgresql.connection().cursor()
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cursor.execute(sql, params)
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ret = [r for r in cursor]
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cursor.close()
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return ret
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@staticmethod
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def _set_fd_cloexec(fd):
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flags = fcntl.fcntl(fd, fcntl.F_GETFD)
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fcntl.fcntl(fd, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
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