go.etcd.io/etcd@v3.3.27+incompatible/etcdserver/api/etcdhttp/peer.go (about) 1 // Copyright 2015 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package etcdhttp 16 17 import ( 18 "encoding/json" 19 "net/http" 20 21 "github.com/coreos/etcd/etcdserver" 22 "github.com/coreos/etcd/etcdserver/api" 23 "github.com/coreos/etcd/lease/leasehttp" 24 "github.com/coreos/etcd/rafthttp" 25 ) 26 27 const ( 28 peerMembersPrefix = "/members" 29 ) 30 31 // NewPeerHandler generates an http.Handler to handle etcd peer requests. 32 func NewPeerHandler(s etcdserver.ServerPeer) http.Handler { 33 return newPeerHandler(s.Cluster(), s.RaftHandler(), s.LeaseHandler()) 34 } 35 36 func newPeerHandler(cluster api.Cluster, raftHandler http.Handler, leaseHandler http.Handler) http.Handler { 37 mh := &peerMembersHandler{ 38 cluster: cluster, 39 } 40 41 mux := http.NewServeMux() 42 mux.HandleFunc("/", http.NotFound) 43 mux.Handle(rafthttp.RaftPrefix, raftHandler) 44 mux.Handle(rafthttp.RaftPrefix+"/", raftHandler) 45 mux.Handle(peerMembersPrefix, mh) 46 if leaseHandler != nil { 47 mux.Handle(leasehttp.LeasePrefix, leaseHandler) 48 mux.Handle(leasehttp.LeaseInternalPrefix, leaseHandler) 49 } 50 mux.HandleFunc(versionPath, versionHandler(cluster, serveVersion)) 51 return mux 52 } 53 54 type peerMembersHandler struct { 55 cluster api.Cluster 56 } 57 58 func (h *peerMembersHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { 59 if !allowMethod(w, r, "GET") { 60 return 61 } 62 w.Header().Set("X-Etcd-Cluster-ID", h.cluster.ID().String()) 63 64 if r.URL.Path != peerMembersPrefix { 65 http.Error(w, "bad path", http.StatusBadRequest) 66 return 67 } 68 ms := h.cluster.Members() 69 w.Header().Set("Content-Type", "application/json") 70 if err := json.NewEncoder(w).Encode(ms); err != nil { 71 plog.Warningf("failed to encode members response (%v)", err) 72 } 73 }