[devtools/testlib] remove dbapi backward-compat
Related to #3933480.
# -*- coding: utf-8 -*-
# copyright 2012-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
from threading import Thread
from logging import getLogger
import zmq
from zmq.eventloop import ioloop
import zmq.eventloop.zmqstream
from cubicweb import set_log_methods
ctx = zmq.Context()
class ZMQComm(object):
"""
A simple ZMQ-based notification bus.
There should at most one instance of this class attached to a
Repository. A typical usage may be something like::
def callback(msg):
self.info('received message: %s', ' '.join(msg))
repo.app_instances_bus.subscribe('hello', callback)
to subsribe to the 'hello' kind of message. On the other side, to
emit a notification, call::
repo.app_instances_bus.publish(['hello', 'world'])
See http://docs.cubicweb.org for more details.
"""
def __init__(self):
self.ioloop = ioloop.IOLoop()
self._topics = {}
self._subscribers = []
self.publisher = None
def add_publisher(self, address):
assert self.publisher is None, "more than one publisher is not supported"
self.publisher = Publisher(self.ioloop, address)
def add_subscription(self, topic, callback):
for subscriber in self._subscribers:
subscriber.subscribe(topic, callback)
self._topics[topic] = callback
def add_subscriber(self, address):
subscriber = Subscriber(self.ioloop, address)
for topic, callback in self._topics.iteritems():
subscriber.subscribe(topic, callback)
self._subscribers.append(subscriber)
def publish(self, msg):
if self.publisher is None:
return
self.publisher.send(msg)
def start(self):
Thread(target=self.ioloop.start).start()
def stop(self):
self.ioloop.add_callback(self.ioloop.stop)
def __del__(self):
self.ioloop.close()
class Publisher(object):
def __init__(self, ioloop, address):
self.address = address
self._topics = {}
self._subscribers = []
self.ioloop = ioloop
def callback():
s = ctx.socket(zmq.PUB)
self.stream = zmq.eventloop.zmqstream.ZMQStream(s, io_loop=ioloop)
self.stream.bind(self.address)
self.debug('start publisher on %s', self.address)
ioloop.add_callback(callback)
def send(self, msg):
self.ioloop.add_callback(lambda:self.stream.send_multipart(msg))
class Subscriber(object):
def __init__(self, ioloop, address):
self.address = address
self.dispatch_table = {}
self.ioloop = ioloop
def callback():
s = ctx.socket(zmq.SUB)
self.stream = zmq.eventloop.zmqstream.ZMQStream(s, io_loop=ioloop)
self.stream.on_recv(self.dispatch)
self.stream.connect(self.address)
self.debug('start subscriber on %s', self.address)
ioloop.add_callback(callback)
def dispatch(self, msg):
try:
f = self.dispatch_table[msg[0]]
except KeyError:
return
f(msg)
def subscribe(self, topic, callback):
self.dispatch_table[topic] = callback
self.ioloop.add_callback(lambda: self.stream.setsockopt(zmq.SUBSCRIBE, topic))
set_log_methods(Publisher, getLogger('cubicweb.zmq.pub'))
set_log_methods(Subscriber, getLogger('cubicweb.zmq.sub'))