/usr/lib/python2.7/dist-packages/oslo_service/tests/eventlet_service.py is in python-oslo.service 1.16.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
# An eventlet server that runs a service.py pool.
# Opens listens on a random port. The port # is printed to stdout.
import socket
import sys
import eventlet.wsgi
import greenlet
from oslo_config import cfg
from oslo_service import service
POOL_SIZE = 1
class Server(service.ServiceBase):
"""Server class to manage multiple WSGI sockets and applications."""
def __init__(self, application, host=None, port=None, keepalive=False,
keepidle=None):
self.application = application
self.host = host or '0.0.0.0'
self.port = port or 0
# Pool for a green thread in which wsgi server will be running
self.pool = eventlet.GreenPool(POOL_SIZE)
self.socket_info = {}
self.greenthread = None
self.keepalive = keepalive
self.keepidle = keepidle
self.socket = None
def listen(self, key=None, backlog=128):
"""Create and start listening on socket.
Call before forking worker processes.
Raises Exception if this has already been called.
"""
# TODO(dims): eventlet's green dns/socket module does not actually
# support IPv6 in getaddrinfo(). We need to get around this in the
# future or monitor upstream for a fix.
# Please refer below link
# (https://bitbucket.org/eventlet/eventlet/
# src/e0f578180d7d82d2ed3d8a96d520103503c524ec/eventlet/support/
# greendns.py?at=0.12#cl-163)
info = socket.getaddrinfo(self.host,
self.port,
socket.AF_UNSPEC,
socket.SOCK_STREAM)[0]
self.socket = eventlet.listen(info[-1], family=info[0],
backlog=backlog)
def start(self, key=None, backlog=128):
"""Run a WSGI server with the given application."""
if self.socket is None:
self.listen(key=key, backlog=backlog)
dup_socket = self.socket.dup()
if key:
self.socket_info[key] = self.socket.getsockname()
# Optionally enable keepalive on the wsgi socket.
if self.keepalive:
dup_socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
if self.keepidle is not None:
dup_socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE,
self.keepidle)
self.greenthread = self.pool.spawn(self._run,
self.application,
dup_socket)
def stop(self):
if self.greenthread is not None:
self.greenthread.kill()
def wait(self):
"""Wait until all servers have completed running."""
try:
self.pool.waitall()
except KeyboardInterrupt:
pass
except greenlet.GreenletExit:
pass
def reset(self):
"""Required by the service interface.
The service interface is used by the launcher when receiving a
SIGHUP. The service interface is defined in
oslo_service.Service.
Test server does not need to do anything here.
"""
pass
def _run(self, application, socket):
"""Start a WSGI server with a new green thread pool."""
try:
eventlet.wsgi.server(socket, application, debug=False)
except greenlet.GreenletExit:
# Wait until all servers have completed running
pass
def run(port_queue, workers=3):
eventlet.patcher.monkey_patch()
def hi_app(environ, start_response):
start_response('200 OK', [('Content-Type', 'application/json')])
yield 'hi'
server = Server(hi_app)
server.listen()
launcher = service.launch(cfg.CONF, server, workers)
port = server.socket.getsockname()[1]
port_queue.put(port)
sys.stdout.flush()
launcher.wait()
if __name__ == '__main__':
run()
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