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