如何进行FaultWrapper解析

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FaultWrapper解析

class FaultWrapper(base_wsgi.Middleware):#继承基础的WSGI中间件"""调用中间件堆栈，将exceptions封装成faults。"""    _status_to_type = {}@staticmethod    def status_to_type(status):        #根据状态码转换成webob相应的类型实例if not FaultWrapper._status_to_type:for clazz in utils.walk_class_hierarchy(webob.exc.HTTPError):# 遍历HTTPError类层次结构                 FaultWrapper._status_to_type[clazz.code] = clazzreturn FaultWrapper._status_to_type.get(                                  status, webob.exc.HTTPInternalServerError)()def _error(self, inner, req):        LOG.exception(_LE("Caught error: %s"), inner)        safe = getattr(inner, 'safe', False)        headers = getattr(inner, 'headers', None)        status = getattr(inner, 'code', 500)if status is None:            status = 500        msg_dict = dict(url=req.url, status=status)        LOG.info(_LI("%(url)s returned with HTTP %(status)d"), msg_dict)        outer = self.status_to_type(status)#调用exception转换方法if headers:            outer.headers = headers# NOTE(johannes): We leave the explanation empty here on        # purpose. It could possibly have sensitive information        # that should not be returned back to the user. See        # bugs 868360 and 874472        # NOTE(eglynn): However, it would be over-conservative and        # inconsistent with the EC2 API to hide every exception,        # including those that are safe to expose, see bug 1021373        if safe:            #处理翻译            user_locale = req.best_match_language()            inner_msg = translate(inner.message, user_locale)            outer.explanation = '%s: %s' % (inner.__class__.__name__,                                            inner_msg)        notifications.send_api_fault(req.url, status, inner)#调用rpc发送api错误到消息队列return wsgi.Fault(outer) #返回webob.exc.HTTPException错误对象    @webob.dec.wsgify(RequestClass=wsgi.Request)def __call__(self, req):try:return req.get_response(self.application) #执行wsgi应用程序except Exception as ex:return self._error(ex, req)#遇到exception后，调用此方法处理exception，封装成http错误返回

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