def serve_rpc():
plugin = manager.NeutronManager.get_plugin()
# If 0 < rpc_workers then start_rpc_listeners would be called in a
# subprocess and we cannot simply catch the NotImplementedError. It is
# simpler to check this up front by testing whether the plugin supports
# multiple RPC workers.
if not plugin.rpc_workers_supported():
LOG.debug("Active plugin doesn't implement start_rpc_listeners")
if 0 < cfg.CONF.rpc_workers:
LOG.error(
_LE("'rpc_workers = %d' ignored because "
"start_rpc_listeners is not implemented."),
cfg.CONF.rpc_workers)
raise NotImplementedError()
try:
rpc = RpcWorker(plugin)
if cfg.CONF.rpc_workers < 1:
rpc.start()
return rpc
else:
launcher = common_service.ProcessLauncher(wait_interval=1.0)
launcher.launch_service(rpc, workers=cfg.CONF.rpc_workers)
return launcher
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(
_LE('Unrecoverable error: please check log for '
'details.'))
def _launch(self, application, workers=0):
service = WorkerService(self, application)
if workers < 1:
# The API service should run in the current process.
self._server = service
service.start()
systemd.notify_once()
else:
# The API service runs in a number of child processes.
# Minimize the cost of checking for child exit by extending the
# wait interval past the default of 0.01s.
self._server = common_service.ProcessLauncher(wait_interval=1.0)
self._server.launch_service(service, workers=workers)
def start(self, application, file_socket, workers, backlog):
self._socket = eventlet.listen(file_socket,
family=socket.AF_UNIX,
backlog=backlog)
if workers < 1:
# For the case where only one process is required.
self._server = self.pool.spawn_n(self._run, application,
self._socket)
else:
# Minimize the cost of checking for child exit by extending the
# wait interval past the default of 0.01s.
self._launcher = service.ProcessLauncher(wait_interval=1.0)
self._server = WorkerService(self, application)
self._launcher.launch_service(self._server, workers=workers)
def _launch(self, application, workers=0):
service = WorkerService(self, application)
if workers < 1:
# The API service should run in the current process.
self._server = service
service.start()
systemd.notify_once()
else:
# dispose the whole pool before os.fork, otherwise there will
# be shared DB connections in child processes which may cause
# DB errors.
api.dispose()
# The API service runs in a number of child processes.
# Minimize the cost of checking for child exit by extending the
# wait interval past the default of 0.01s.
self._server = common_service.ProcessLauncher(wait_interval=1.0)
self._server.launch_service(service, workers=workers)
def start(self, application, port, host='0.0.0.0', workers=0):
"""Run a WSGI server with the given application."""
self._host = host
self._port = port
backlog = CONF.backlog
self._socket = self._get_socket(self._host,
self._port,
backlog=backlog)
if workers < 1:
# For the case where only one process is required.
self._server = self.pool.spawn(self._run, application,
self._socket)
else:
# Minimize the cost of checking for child exit by extending the
# wait interval past the default of 0.01s.
self._launcher = common_service.ProcessLauncher(wait_interval=1.0)
self._server = WorkerService(self, application)
self._launcher.launch_service(self._server, workers=workers)