116 lines
3.5 KiB
Python
116 lines
3.5 KiB
Python
# Copyright 2017 Platform9 Systems, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_config import cfg
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from oslo_service import service
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from oslo_service import wsgi
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from oslo_utils import importutils
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CONF = cfg.CONF
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class WSGIService(service.ServiceBase):
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"""Provides ability to launch API from a 'paste' configuration."""
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def __init__(self, name, loader=None):
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"""Initialize, but do not start the WSGI server.
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:param name: The name of the WSGI server given to the loader.
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:param loader: Loads the WSGI application using the given name.
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:returns: None
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"""
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self.name = name
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self.manager = self._get_manager()
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self.loader = loader or wsgi.Loader(CONF)
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self.app = self.loader.load_app(name)
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self.host = getattr(CONF, '%s_listen' % name, "0.0.0.0")
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self.port = getattr(CONF, '%s_listen_port' % name, 0)
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self.use_ssl = getattr(CONF, '%s_use_ssl' % name, False)
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self.workers = getattr(CONF, '%s_workers' % name, 1)
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if self.workers and self.workers < 1:
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worker_name = '%s_workers' % name
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msg = ("%(worker_name)s value of %(workers)d is invalid, "
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"must be greater than 0." %
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{'worker_name': worker_name,
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'workers': self.workers})
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raise Exception(msg)
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# setup_profiler(name, self.host)
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self.server = wsgi.Server(CONF,
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name,
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self.app,
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host=self.host,
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port=self.port,
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use_ssl=self.use_ssl)
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def _get_manager(self):
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"""Initialize a Manager object appropriate for this service.
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Use the service name to look up a Manager subclass from the
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configuration and initialize an instance. If no class name
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is configured, just return None.
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:returns: a Manager instance, or None.
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"""
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fl = '%s_manager' % self.name
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if fl not in CONF:
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return None
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manager_class_name = CONF.get(fl, None)
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if not manager_class_name:
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return None
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manager_class = importutils.import_class(manager_class_name)
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return manager_class()
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def start(self):
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"""Start serving this service using loaded configuration.
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Also, retrieve updated port number in case '0' was passed in, which
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indicates a random port should be used.
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:returns: None
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"""
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if self.manager:
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self.manager.init_host()
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self.server.start()
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self.port = self.server.port
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def stop(self):
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"""Stop serving this API.
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:returns: None
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"""
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self.server.stop()
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def wait(self):
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"""Wait for the service to stop serving this API.
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:returns: None
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"""
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self.server.wait()
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def reset(self):
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"""Reset server greenpool size to default.
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:returns: None
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"""
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self.server.reset()
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