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Allow DB hosts to be a list for PostgreSQL connections. #335

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May 4, 2018
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Allow DB hosts to be a list for PostgreSQL connections. #335

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9 changes: 9 additions & 0 deletions tilequeue/query/pool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import psycopg2
import threading
import ujson
import random


class ConnectionsContextManager(object):
Expand Down Expand Up @@ -38,6 +39,14 @@ def __init__(self, dbnames, conn_info, readonly=True):
self.readonly = readonly

def _make_conn(self, conn_info):
# if multiple hosts are provided, select one at random as a kind of
# simple load balancing.
host = conn_info.get('host')
if host and isinstance(host, list):
host = random.choice(host)
conn_info = conn_info.copy()
conn_info['host'] = host

conn = psycopg2.connect(**conn_info)
conn.set_session(readonly=self.readonly, autocommit=True)
register_hstore(conn)
Expand Down