+++ /dev/null
-"""A wait callback to allow psycopg2 cooperation with eventlet.
-
-Use `make_psycopg_green()` to enable eventlet support in Psycopg.
-"""
-
-# Copyright (C) 2010 Daniele Varrazzo <daniele.varrazzo@gmail.com>
-# and licensed under the MIT license:
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-
-import psycopg2
-from psycopg2 import extensions
-
-from eventlet.hubs import trampoline
-
-
-def make_psycopg_green():
- """Configure Psycopg to be used with eventlet 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(eventlet_wait_callback)
-
-
-def eventlet_wait_callback(conn, timeout=-1):
- """A wait callback useful to allow eventlet to work with Psycopg."""
- while 1:
- state = conn.poll()
- if state == extensions.POLL_OK:
- break
- elif state == extensions.POLL_READ:
- trampoline(conn.fileno(), read=True)
- elif state == extensions.POLL_WRITE:
- trampoline(conn.fileno(), write=True)
- else:
- raise psycopg2.OperationalError(
- "Bad result from poll: %r" % state)