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"""A wait callback to allow psycopg2 cooperation with gevent.
Use `patch_psycopg()` to enable gevent support in Psycopg.
"""
# Copyright (C) 2010-2012 Daniele Varrazzo <daniele.varrazzo@gmail.com>
# All rights reserved. See COPYING file for details.
from __future__ import absolute_import
import psycopg2
from psycopg2 import extensions
from gevent.socket import wait_read, wait_write
def patch_psycopg():
"""Configure Psycopg to be used with gevent in non-blocking way."""
if not hasattr(extensions, 'set_wait_callback'):
raise ImportError(
"support for coroutines not available in this Psycopg version (%s)"
% psycopg2.__version__)
extensions.set_wait_callback(gevent_wait_callback)
def gevent_wait_callback(conn, timeout=None):
"""A wait callback useful to allow gevent to work with Psycopg."""
while 1:
state = conn.poll()
if state == extensions.POLL_OK:
break
elif state == extensions.POLL_READ:
wait_read(conn.fileno(), timeout=timeout)
elif state == extensions.POLL_WRITE:
wait_write(conn.fileno(), timeout=timeout)
else:
raise psycopg2.OperationalError(
"Bad result from poll: %r" % state)