8994ffcab1
2. Added router to Route /datacenters/ and /services/ URLs 3. Added stubs for windc/core/api. 4. Fixed start-up process for service ------------------------------------------------- Now it is working service which will reply for curl http://localhost:8181/tenant_id/datacenters/ curl http://localhost:8181/tenant_id/datacenters/dc_id/services curl http://localhost:8181/tenant_id/datacenters/dc_id/services/service_id
718 lines
24 KiB
Python
718 lines
24 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Utility methods for working with WSGI servers."""
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import datetime
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import eventlet
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import eventlet.wsgi
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eventlet.patcher.monkey_patch(all=False, socket=True)
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import json
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import logging
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import sys
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import routes
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import routes.middleware
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import webob.dec
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import webob.exc
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from xml.dom import minidom
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from xml.parsers import expat
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from openstack.common import exception
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LOG = logging.getLogger('wsgi')
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class WritableLogger(object):
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"""A thin wrapper that responds to `write` and logs."""
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def __init__(self, logger, level=logging.DEBUG):
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self.logger = logger
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self.level = level
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def write(self, msg):
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self.logger.log(self.level, msg.strip("\n"))
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def run_server(application, port):
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"""Run a WSGI server with the given application."""
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sock = eventlet.listen(('0.0.0.0', port))
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eventlet.wsgi.server(sock, application)
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class Server(object):
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"""Server class to manage multiple WSGI sockets and applications."""
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def __init__(self, threads=1000):
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self.pool = eventlet.GreenPool(threads)
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def start(self, application, port, host='0.0.0.0', backlog=128):
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"""Run a WSGI server with the given application."""
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socket = eventlet.listen((host, port), backlog=backlog)
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self.pool.spawn_n(self._run, application, socket)
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def wait(self):
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"""Wait until all servers have completed running."""
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try:
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self.pool.waitall()
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except KeyboardInterrupt:
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pass
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def _run(self, application, socket):
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"""Start a WSGI server in a new green thread."""
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logger = logging.getLogger('eventlet.wsgi.server')
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eventlet.wsgi.server(socket, application, custom_pool=self.pool,
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log=WritableLogger(logger))
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class Middleware(object):
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"""
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Base WSGI middleware wrapper. These classes require an application to be
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initialized that will be called next. By default the middleware will
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simply call its wrapped app, or you can override __call__ to customize its
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behavior.
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"""
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def __init__(self, application):
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self.application = application
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def process_request(self, req):
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"""
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Called on each request.
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If this returns None, the next application down the stack will be
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executed. If it returns a response then that response will be returned
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and execution will stop here.
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"""
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return None
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def process_response(self, response):
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"""Do whatever you'd like to the response."""
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return response
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@webob.dec.wsgify
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def __call__(self, req):
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response = self.process_request(req)
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if response:
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return response
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response = req.get_response(self.application)
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return self.process_response(response)
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class Debug(Middleware):
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"""
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Helper class that can be inserted into any WSGI application chain
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to get information about the request and response.
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"""
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@webob.dec.wsgify
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def __call__(self, req):
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print ("*" * 40) + " REQUEST ENVIRON"
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for key, value in req.environ.items():
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print key, "=", value
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print
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resp = req.get_response(self.application)
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print ("*" * 40) + " RESPONSE HEADERS"
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for (key, value) in resp.headers.iteritems():
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print key, "=", value
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print
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resp.app_iter = self.print_generator(resp.app_iter)
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return resp
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@staticmethod
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def print_generator(app_iter):
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"""
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Iterator that prints the contents of a wrapper string iterator
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when iterated.
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"""
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print ("*" * 40) + " BODY"
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for part in app_iter:
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sys.stdout.write(part)
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sys.stdout.flush()
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yield part
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print
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class Router(object):
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"""
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WSGI middleware that maps incoming requests to WSGI apps.
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"""
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def __init__(self, mapper):
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"""
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Create a router for the given routes.Mapper.
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Each route in `mapper` must specify a 'controller', which is a
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WSGI app to call. You'll probably want to specify an 'action' as
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well and have your controller be a wsgi.Controller, who will route
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the request to the action method.
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Examples:
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mapper = routes.Mapper()
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sc = ServerController()
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# Explicit mapping of one route to a controller+action
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mapper.connect(None, "/svrlist", controller=sc, action="list")
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# Actions are all implicitly defined
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mapper.resource("server", "servers", controller=sc)
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# Pointing to an arbitrary WSGI app. You can specify the
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# {path_info:.*} parameter so the target app can be handed just that
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# section of the URL.
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mapper.connect(None, "/v1.0/{path_info:.*}", controller=BlogApp())
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"""
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self.map = mapper
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self._router = routes.middleware.RoutesMiddleware(self._dispatch,
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self.map)
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@webob.dec.wsgify
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def __call__(self, req):
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"""
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Route the incoming request to a controller based on self.map.
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If no match, return a 404.
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"""
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return self._router
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@staticmethod
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@webob.dec.wsgify
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def _dispatch(req):
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"""
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Called by self._router after matching the incoming request to a route
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and putting the information into req.environ. Either returns 404
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or the routed WSGI app's response.
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"""
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match = req.environ['wsgiorg.routing_args'][1]
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if not match:
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return webob.exc.HTTPNotFound()
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app = match['controller']
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return app
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class Request(webob.Request):
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"""Add some Openstack API-specific logic to the base webob.Request."""
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default_request_content_types = ('application/json', 'application/xml')
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default_accept_types = ('application/json', 'application/xml')
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default_accept_type = 'application/json'
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def best_match_content_type(self, supported_content_types=None):
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"""Determine the requested response content-type.
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Based on the query extension then the Accept header.
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Defaults to default_accept_type if we don't find a preference
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"""
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supported_content_types = (supported_content_types or
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self.default_accept_types)
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parts = self.path.rsplit('.', 1)
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if len(parts) > 1:
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ctype = 'application/{0}'.format(parts[1])
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if ctype in supported_content_types:
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return ctype
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bm = self.accept.best_match(supported_content_types)
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return bm or self.default_accept_type
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def get_content_type(self, allowed_content_types=None):
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"""Determine content type of the request body.
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Does not do any body introspection, only checks header
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"""
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if not "Content-Type" in self.headers:
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return None
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content_type = self.content_type
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allowed_content_types = (allowed_content_types or
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self.default_request_content_types)
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if content_type not in allowed_content_types:
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raise exception.InvalidContentType(content_type=content_type)
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return content_type
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class Resource(object):
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"""
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WSGI app that handles (de)serialization and controller dispatch.
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Reads routing information supplied by RoutesMiddleware and calls
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the requested action method upon its deserializer, controller,
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and serializer. Those three objects may implement any of the basic
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controller action methods (create, update, show, index, delete)
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along with any that may be specified in the api router. A 'default'
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method may also be implemented to be used in place of any
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non-implemented actions. Deserializer methods must accept a request
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argument and return a dictionary. Controller methods must accept a
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request argument. Additionally, they must also accept keyword
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arguments that represent the keys returned by the Deserializer. They
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may raise a webob.exc exception or return a dict, which will be
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serialized by requested content type.
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"""
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def __init__(self, controller, deserializer=None, serializer=None):
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"""
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:param controller: object that implement methods created by routes lib
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:param deserializer: object that supports webob request deserialization
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through controller-like actions
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:param serializer: object that supports webob response serialization
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through controller-like actions
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"""
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self.controller = controller
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self.serializer = serializer or ResponseSerializer()
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self.deserializer = deserializer or RequestDeserializer()
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@webob.dec.wsgify(RequestClass=Request)
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def __call__(self, request):
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"""WSGI method that controls (de)serialization and method dispatch."""
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try:
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action, action_args, accept = self.deserialize_request(request)
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except exception.InvalidContentType:
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msg = _("Unsupported Content-Type")
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return webob.exc.HTTPUnsupportedMediaType(explanation=msg)
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except exception.MalformedRequestBody:
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msg = _("Malformed request body")
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return webob.exc.HTTPBadRequest(explanation=msg)
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action_result = self.execute_action(action, request, **action_args)
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try:
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return self.serialize_response(action, action_result, accept)
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# return unserializable result (typically a webob exc)
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except Exception:
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return action_result
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def deserialize_request(self, request):
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return self.deserializer.deserialize(request)
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def serialize_response(self, action, action_result, accept):
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return self.serializer.serialize(action_result, accept, action)
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def execute_action(self, action, request, **action_args):
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return self.dispatch(self.controller, action, request, **action_args)
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def dispatch(self, obj, action, *args, **kwargs):
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"""Find action-specific method on self and call it."""
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try:
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method = getattr(obj, action)
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except AttributeError:
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method = getattr(obj, 'default')
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return method(*args, **kwargs)
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def get_action_args(self, request_environment):
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"""Parse dictionary created by routes library."""
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try:
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args = request_environment['wsgiorg.routing_args'][1].copy()
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except Exception:
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return {}
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try:
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del args['controller']
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except KeyError:
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pass
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try:
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del args['format']
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except KeyError:
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pass
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return args
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class ActionDispatcher(object):
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"""Maps method name to local methods through action name."""
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def dispatch(self, *args, **kwargs):
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"""Find and call local method."""
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action = kwargs.pop('action', 'default')
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action_method = getattr(self, str(action), self.default)
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return action_method(*args, **kwargs)
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def default(self, data):
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raise NotImplementedError()
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class DictSerializer(ActionDispatcher):
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"""Default request body serialization"""
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def serialize(self, data, action='default'):
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return self.dispatch(data, action=action)
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def default(self, data):
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return ""
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class JSONDictSerializer(DictSerializer):
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"""Default JSON request body serialization"""
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def default(self, data):
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def sanitizer(obj):
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if isinstance(obj, datetime.datetime):
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_dtime = obj - datetime.timedelta(microseconds=obj.microsecond)
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return _dtime.isoformat()
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return obj
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return json.dumps(data, default=sanitizer)
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class XMLDictSerializer(DictSerializer):
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def __init__(self, metadata=None, xmlns=None):
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"""
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:param metadata: information needed to deserialize xml into
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a dictionary.
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:param xmlns: XML namespace to include with serialized xml
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"""
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super(XMLDictSerializer, self).__init__()
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self.metadata = metadata or {}
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self.xmlns = xmlns
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def default(self, data):
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# We expect data to contain a single key which is the XML root.
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root_key = data.keys()[0]
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doc = minidom.Document()
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node = self._to_xml_node(doc, self.metadata, root_key, data[root_key])
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return self.to_xml_string(node)
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def to_xml_string(self, node, has_atom=False):
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self._add_xmlns(node, has_atom)
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return node.toprettyxml(indent=' ', encoding='UTF-8')
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#NOTE (ameade): the has_atom should be removed after all of the
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# xml serializers and view builders have been updated to the current
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# spec that required all responses include the xmlns:atom, the has_atom
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# flag is to prevent current tests from breaking
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def _add_xmlns(self, node, has_atom=False):
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if self.xmlns is not None:
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node.setAttribute('xmlns', self.xmlns)
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if has_atom:
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node.setAttribute('xmlns:atom', "http://www.w3.org/2005/Atom")
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def _to_xml_node(self, doc, metadata, nodename, data):
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"""Recursive method to convert data members to XML nodes."""
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result = doc.createElement(nodename)
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# Set the xml namespace if one is specified
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# TODO(justinsb): We could also use prefixes on the keys
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xmlns = metadata.get('xmlns', None)
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if xmlns:
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result.setAttribute('xmlns', xmlns)
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#TODO(bcwaldon): accomplish this without a type-check
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if type(data) is list:
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collections = metadata.get('list_collections', {})
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if nodename in collections:
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metadata = collections[nodename]
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for item in data:
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node = doc.createElement(metadata['item_name'])
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node.setAttribute(metadata['item_key'], str(item))
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result.appendChild(node)
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return result
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singular = metadata.get('plurals', {}).get(nodename, None)
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if singular is None:
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if nodename.endswith('s'):
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singular = nodename[:-1]
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else:
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singular = 'item'
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for item in data:
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node = self._to_xml_node(doc, metadata, singular, item)
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result.appendChild(node)
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#TODO(bcwaldon): accomplish this without a type-check
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elif type(data) is dict:
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collections = metadata.get('dict_collections', {})
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if nodename in collections:
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metadata = collections[nodename]
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for k, v in data.items():
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node = doc.createElement(metadata['item_name'])
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node.setAttribute(metadata['item_key'], str(k))
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text = doc.createTextNode(str(v))
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node.appendChild(text)
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result.appendChild(node)
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return result
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attrs = metadata.get('attributes', {}).get(nodename, {})
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for k, v in data.items():
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if k in attrs:
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result.setAttribute(k, str(v))
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else:
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node = self._to_xml_node(doc, metadata, k, v)
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result.appendChild(node)
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else:
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# Type is atom
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node = doc.createTextNode(str(data))
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result.appendChild(node)
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return result
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def _create_link_nodes(self, xml_doc, links):
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link_nodes = []
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for link in links:
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link_node = xml_doc.createElement('atom:link')
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link_node.setAttribute('rel', link['rel'])
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link_node.setAttribute('href', link['href'])
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if 'type' in link:
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link_node.setAttribute('type', link['type'])
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link_nodes.append(link_node)
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return link_nodes
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class ResponseHeadersSerializer(ActionDispatcher):
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"""Default response headers serialization"""
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def serialize(self, response, data, action):
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self.dispatch(response, data, action=action)
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def default(self, response, data):
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response.status_int = 200
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class ResponseSerializer(object):
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"""Encode the necessary pieces into a response object"""
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def __init__(self, body_serializers=None, headers_serializer=None):
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self.body_serializers = {
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'application/xml': XMLDictSerializer(),
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'application/json': JSONDictSerializer(),
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}
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self.body_serializers.update(body_serializers or {})
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self.headers_serializer = headers_serializer or \
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ResponseHeadersSerializer()
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def serialize(self, response_data, content_type, action='default'):
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"""Serialize a dict into a string and wrap in a wsgi.Request object.
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:param response_data: dict produced by the Controller
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:param content_type: expected mimetype of serialized response body
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"""
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response = webob.Response()
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self.serialize_headers(response, response_data, action)
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self.serialize_body(response, response_data, content_type, action)
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return response
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def serialize_headers(self, response, data, action):
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self.headers_serializer.serialize(response, data, action)
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def serialize_body(self, response, data, content_type, action):
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response.headers['Content-Type'] = content_type
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if data is not None:
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serializer = self.get_body_serializer(content_type)
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response.body = serializer.serialize(data, action)
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def get_body_serializer(self, content_type):
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try:
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return self.body_serializers[content_type]
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except (KeyError, TypeError):
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raise exception.InvalidContentType(content_type=content_type)
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class RequestHeadersDeserializer(ActionDispatcher):
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"""Default request headers deserializer"""
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def deserialize(self, request, action):
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return self.dispatch(request, action=action)
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def default(self, request):
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return {}
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class RequestDeserializer(object):
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"""Break up a Request object into more useful pieces."""
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|
|
def __init__(self, body_deserializers=None, headers_deserializer=None,
|
|
supported_content_types=None):
|
|
|
|
self.supported_content_types = supported_content_types
|
|
|
|
self.body_deserializers = {
|
|
'application/xml': XMLDeserializer(),
|
|
'application/json': JSONDeserializer(),
|
|
}
|
|
self.body_deserializers.update(body_deserializers or {})
|
|
|
|
self.headers_deserializer = headers_deserializer or \
|
|
RequestHeadersDeserializer()
|
|
|
|
def deserialize(self, request):
|
|
"""Extract necessary pieces of the request.
|
|
|
|
:param request: Request object
|
|
:returns tuple of expected controller action name, dictionary of
|
|
keyword arguments to pass to the controller, the expected
|
|
content type of the response
|
|
|
|
"""
|
|
action_args = self.get_action_args(request.environ)
|
|
action = action_args.pop('action', None)
|
|
|
|
action_args.update(self.deserialize_headers(request, action))
|
|
action_args.update(self.deserialize_body(request, action))
|
|
|
|
accept = self.get_expected_content_type(request)
|
|
|
|
return (action, action_args, accept)
|
|
|
|
def deserialize_headers(self, request, action):
|
|
return self.headers_deserializer.deserialize(request, action)
|
|
|
|
def deserialize_body(self, request, action):
|
|
if not len(request.body) > 0:
|
|
LOG.debug(_("Empty body provided in request"))
|
|
return {}
|
|
|
|
try:
|
|
content_type = request.get_content_type()
|
|
except exception.InvalidContentType:
|
|
LOG.debug(_("Unrecognized Content-Type provided in request"))
|
|
raise
|
|
|
|
if content_type is None:
|
|
LOG.debug(_("No Content-Type provided in request"))
|
|
return {}
|
|
|
|
try:
|
|
deserializer = self.get_body_deserializer(content_type)
|
|
except exception.InvalidContentType:
|
|
LOG.debug(_("Unable to deserialize body as provided Content-Type"))
|
|
raise
|
|
|
|
return deserializer.deserialize(request.body, action)
|
|
|
|
def get_body_deserializer(self, content_type):
|
|
try:
|
|
return self.body_deserializers[content_type]
|
|
except (KeyError, TypeError):
|
|
raise exception.InvalidContentType(content_type=content_type)
|
|
|
|
def get_expected_content_type(self, request):
|
|
return request.best_match_content_type(self.supported_content_types)
|
|
|
|
def get_action_args(self, request_environment):
|
|
"""Parse dictionary created by routes library."""
|
|
try:
|
|
args = request_environment['wsgiorg.routing_args'][1].copy()
|
|
except Exception:
|
|
return {}
|
|
|
|
try:
|
|
del args['controller']
|
|
except KeyError:
|
|
pass
|
|
|
|
try:
|
|
del args['format']
|
|
except KeyError:
|
|
pass
|
|
|
|
return args
|
|
|
|
|
|
class TextDeserializer(ActionDispatcher):
|
|
"""Default request body deserialization"""
|
|
|
|
def deserialize(self, datastring, action='default'):
|
|
return self.dispatch(datastring, action=action)
|
|
|
|
def default(self, datastring):
|
|
return {}
|
|
|
|
|
|
class JSONDeserializer(TextDeserializer):
|
|
|
|
def _from_json(self, datastring):
|
|
try:
|
|
return json.loads(datastring)
|
|
except ValueError:
|
|
msg = _("cannot understand JSON")
|
|
raise exception.MalformedRequestBody(reason=msg)
|
|
|
|
def default(self, datastring):
|
|
return {'body': self._from_json(datastring)}
|
|
|
|
|
|
class XMLDeserializer(TextDeserializer):
|
|
|
|
def __init__(self, metadata=None):
|
|
"""
|
|
:param metadata: information needed to deserialize xml into
|
|
a dictionary.
|
|
"""
|
|
super(XMLDeserializer, self).__init__()
|
|
self.metadata = metadata or {}
|
|
|
|
def _from_xml(self, datastring):
|
|
plurals = set(self.metadata.get('plurals', {}))
|
|
|
|
try:
|
|
node = minidom.parseString(datastring).childNodes[0]
|
|
return {node.nodeName: self._from_xml_node(node, plurals)}
|
|
except expat.ExpatError:
|
|
msg = _("cannot understand XML")
|
|
raise exception.MalformedRequestBody(reason=msg)
|
|
|
|
def _from_xml_node(self, node, listnames):
|
|
"""Convert a minidom node to a simple Python type.
|
|
|
|
:param listnames: list of XML node names whose subnodes should
|
|
be considered list items.
|
|
|
|
"""
|
|
|
|
if len(node.childNodes) == 1 and node.childNodes[0].nodeType == 3:
|
|
return node.childNodes[0].nodeValue
|
|
elif node.nodeName in listnames:
|
|
return [self._from_xml_node(n, listnames) for n in node.childNodes]
|
|
else:
|
|
result = dict()
|
|
for attr in node.attributes.keys():
|
|
result[attr] = node.attributes[attr].nodeValue
|
|
for child in node.childNodes:
|
|
if child.nodeType != node.TEXT_NODE:
|
|
result[child.nodeName] = self._from_xml_node(child,
|
|
listnames)
|
|
return result
|
|
|
|
def find_first_child_named(self, parent, name):
|
|
"""Search a nodes children for the first child with a given name"""
|
|
for node in parent.childNodes:
|
|
if node.nodeName == name:
|
|
return node
|
|
return None
|
|
|
|
def find_children_named(self, parent, name):
|
|
"""Return all of a nodes children who have the given name"""
|
|
for node in parent.childNodes:
|
|
if node.nodeName == name:
|
|
yield node
|
|
|
|
def extract_text(self, node):
|
|
"""Get the text field contained by the given node"""
|
|
if len(node.childNodes) == 1:
|
|
child = node.childNodes[0]
|
|
if child.nodeType == child.TEXT_NODE:
|
|
return child.nodeValue
|
|
return ""
|
|
|
|
def default(self, datastring):
|
|
return {'body': self._from_xml(datastring)}
|