這期內(nèi)容當(dāng)中小編將會(huì)給大家?guī)碛嘘P(guān) 仿Openstack的WSGI接口及RESTul服務(wù)實(shí)現(xiàn)是怎樣的,文章內(nèi)容豐富且以專業(yè)的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。

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Openstack的WSGI接口通過webob,pastedeploy,routes實(shí)現(xiàn)了Controller類,和Router類,這里仿照Openstack的WSG接口實(shí)現(xiàn)簡(jiǎn)單的測(cè)試程序 首先是testroutes.py文件
import logging
import os
import webob.dec
import webob.exc
from paste.deploy import loadapp
from wsgiref.simple_server import make_server
import routes.middleware
# Environment variable used to pass the request context
CONTEXT_ENV = 'openstack.context'
# Environment variable used to pass the request params
PARAMS_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
由此可見,ini文件按照pastedeploy的模式配置了根目錄/,指向pipeline show,pipeline又指向app root。app下指向的是Router的app_factory函數(shù),返回的是Router().根據(jù)調(diào)用過程,初始化__init__->__call__返回self._routers.根據(jù)__init__下寫的映射規(guī)則,能識(shí)別類似/test/123這樣的路徑,其處理函數(shù)調(diào)用"Controller"的"action"函數(shù),也就是getMessage。
測(cè)試運(yùn)行,在瀏覽器下輸入127.0.0,1:8282/test/123
返回OK,如
return webob.Response('OK')上述就是小編為大家分享的 仿Openstack的WSGI接口及RESTul服務(wù)實(shí)現(xiàn)是怎樣的了,如果剛好有類似的疑惑,不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí),歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
網(wǎng)站標(biāo)題:仿Openstack的WSGI接口及RESTul服務(wù)實(shí)現(xiàn)是怎樣的
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