/
handler.go
125 lines (108 loc) · 5.29 KB
/
handler.go
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/*
* Copyright (c) 2020 Baidu, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package server
import (
"net/http"
"strings"
restful "github.com/emicklei/go-restful"
"github.com/baidu/easyfaas/pkg/util/logs"
"github.com/baidu/easyfaas/pkg/api"
"github.com/baidu/easyfaas/pkg/server/mux"
)
// ServerHandler holds the different http.Handlers used by the API server.
// This includes the full handler chain, the director (which chooses between gorestful and nonGoRestful,
// the gorestful handler (used for the API) which falls through to the nonGoRestful handler on unregistered paths,
// and the nonGoRestful handler (which can contain a fallthrough of its own)
// FullHandlerChain -> Director -> {GoRestfulContainer,NonGoRestfulMux} based on inspection of registered web services
type ServerHandler struct {
// FullHandlerChain is the one that is eventually served with. It should include the full filter
// chain and then call the Director.
FullHandlerChain http.Handler
// The registered APIs. InstallAPIs uses this. Other servers probably shouldn't access this directly.
GoRestfulContainer *restful.Container
// NonGoRestfulMux is the final HTTP handler in the chain.
// It comes after all filters and the API handling
// This is where other servers can attach handler to various parts of the chain.
NonGoRestfulMux *mux.PathRecorderMux
// Director is here so that we can properly handle fall through and proxy cases.
Director http.Handler
}
// HandlerChainBuilderFn is used to wrap the GoRestfulContainer handler using the provided handler chain.
// It is normally used to apply filtering like authentication and authorization
type HandlerChainBuilderFn func(apiHandler http.Handler) http.Handler
// NewServerHandler xxx
func NewServerHandler(name string, handlerChainBuilder HandlerChainBuilderFn, notFoundHandler http.Handler) *ServerHandler {
nonGoRestfulMux := mux.NewPathRecorderMux(name)
if notFoundHandler != nil {
nonGoRestfulMux.NotFoundHandler(notFoundHandler)
}
gorestfulContainer := restful.NewContainer()
gorestfulContainer.ServeMux = http.NewServeMux()
gorestfulContainer.Router(restful.CurlyRouter{})
director := director{
name: name,
goRestfulContainer: gorestfulContainer,
nonGoRestfulMux: nonGoRestfulMux,
}
return &ServerHandler{
FullHandlerChain: handlerChainBuilder(director),
GoRestfulContainer: gorestfulContainer,
NonGoRestfulMux: nonGoRestfulMux,
Director: director,
}
}
type director struct {
name string
goRestfulContainer *restful.Container
nonGoRestfulMux *mux.PathRecorderMux
}
func (d director) ServeHTTP(w http.ResponseWriter, req *http.Request) {
path := req.URL.Path
req.Header.Add(api.AppNameKey, d.name)
// check to see if our webservices want to claim this path
for _, ws := range d.goRestfulContainer.RegisteredWebServices() {
switch {
case ws.RootPath() == "/apis":
// if we are exactly /apis or /apis/, then we need special handling in loop.
// normally these are passed to the nonGoRestfulMux, but if discovery is enabled, it will go directly.
// We can't rely on a prefix match since /apis matches everything (see the big comment on Director above)
if path == "/apis" || path == "/apis/" {
logs.NewLogger().V(10).WithField(api.HeaderXRequestID, req.Header.Get(api.HeaderXRequestID)).WithField(api.AppNameKey, d.name).Debugf("[msg:%s %q satisfied by gorestful with webservice %v]", req.Method, path, ws.RootPath())
// logs.Debugf("[%s:%s][%s:%s][msg:%s %q satisfied by gorestful with webservice %v]", api.HeaderXRequestID, req.Header.Get(api.HeaderXRequestID), api.AppNameKey, d.name, req.Method, path, ws.RootPath())
// don't use servemux here because gorestful servemuxes get messed up when removing webservices
// TODO fix gorestful, remove TPRs, or stop using gorestful
d.goRestfulContainer.Dispatch(w, req)
return
}
case strings.HasPrefix(path, ws.RootPath()):
// ensure an exact match or a path boundary match
if len(path) == len(ws.RootPath()) || path[len(ws.RootPath())] == '/' {
logs.NewLogger().V(10).WithField(api.HeaderXRequestID, req.Header.Get(api.HeaderXRequestID)).WithField(api.AppNameKey, d.name).Debugf("[msg:%s %q satisfied by gorestful with webservice %v]", req.Method, path, ws.RootPath())
// don't use servemux here because gorestful servemuxes get messed up when removing webservices
// TODO fix gorestful, remove TPRs, or stop using gorestful
d.goRestfulContainer.Dispatch(w, req)
return
}
}
}
// if we didn't find a match, then we just skip gorestful altogether
logs.V(8).Infof("%v: %v %q satisfied by nonGoRestful", d.name, req.Method, path)
d.nonGoRestfulMux.ServeHTTP(w, req)
}
// ServeHTTP makes it an http.Handler
func (s *ServerHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
s.FullHandlerChain.ServeHTTP(w, r)
}