仿Openstack的WSGI接口及RESTul服务实现是怎样的

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Openstack的WSGI接口通过webob,pastedeploy,routes实现了Controller类，和Router类，这里仿照Openstack的WSG接口实现简单的测试程序首先是testroutes.py文件

import loggingimport osimport webob.dec  import webob.excfrom paste.deploy import loadappfrom wsgiref.simple_server import make_server  import routes.middleware  # Environment variable used to pass the request contextCONTEXT_ENV = 'openstack.context'# Environment variable used to pass the request paramsPARAMS_ENV = 'openstack.params'LOG = logging.getLogger(__name__)class Controller(object):     @webob.dec.wsgify    def __call__(self, req):        arg_dict = req.environ['wsgiorg.routing_args'][1]        action = arg_dict.pop('action')        del arg_dict['controller']        context = req.environ.get(CONTEXT_ENV, {})        context['query_string'] = dict(req.params.iteritems())        context['headers'] = dict(req.headers.iteritems())        context['path'] = req.environ['PATH_INFO']        params = req.environ.get(PARAMS_ENV, {})        for name in ['REMOTE_USER', 'AUTH_TYPE']:            try:                context[name] = req.environ[name]            except KeyError:                try:                    del context[name]                except KeyError:                    pass        params.update(arg_dict)        # TODO(termie): do some basic normalization on methods        method = getattr(self, action)                result = method(context, **params)                return webob.Response('OK')        def getMessage(self,context, user_id):        return {'Message': 'TestMessage'}        pass        class Router(object):      def __init__(self):          self._mapper = routes.Mapper()          self._mapper.connect('/test/{user_id}',                            controller=Controller(),                            action='getMessage',                            conditions={'method': ['GET']})                self._router = routes.middleware.RoutesMiddleware(self._dispatch, self._mapper)         @webob.dec.wsgify      def __call__(self, req):        return self._router        @staticmethod      @webob.dec.wsgify      def _dispatch(req):        match = req.environ['wsgiorg.routing_args'][1]                                if not match:              return webob.exc.HTTPNotFound()                        app = match['controller']        return app        @classmethod    def app_factory(cls, global_config, **local_config):            return cls()        if __name__ == '__main__':    configfile='testroutes.ini'    appname="main"    wsgi_app = loadapp("config:%s" % os.path.abspath(configfile), appname)      httpd = make_server('localhost', 8282, wsgi_app)      httpd.serve_forever()

然后是testroutes.ini文件

[DEFAULT]name=huang[composite:main]use=egg:Paste#urlmap/=show[pipeline:show]pipeline = root[app:root]paste.app_factory = testroutes:Router.app_factory

由此可见，ini文件按照pastedeploy的模式配置了根目录/，指向pipeline show，pipeline又指向app root。app下指向的是Router的app_factory函数，返回的是Router().根据调用过程，初始化__init__->__call__返回self._routers.根据__init__下写的映射规则，能识别类似/test/123这样的路径，其处理函数调用"Controller"的"action"函数，也就是getMessage。

测试运行，在浏览器下输入127.0.0,1:8282/test/123

返回OK,如

return webob.Response('OK')

上述就是小编为大家分享的 仿Openstack的WSGI接口及RESTul服务实现是怎样的了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注行业资讯频道。