125 lines
3.3 KiB
Go
125 lines
3.3 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package etcdhttp
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import (
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"encoding/json"
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"io/ioutil"
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"log"
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"net/http"
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"strconv"
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"github.com/coreos/etcd/Godeps/_workspace/src/code.google.com/p/go.net/context"
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"github.com/coreos/etcd/etcdserver"
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"github.com/coreos/etcd/raft/raftpb"
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)
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const (
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raftPrefix = "/raft"
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peerMembersPrefix = "/members"
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)
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// NewPeerHandler generates an http.Handler to handle etcd peer (raft) requests.
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func NewPeerHandler(server *etcdserver.EtcdServer) http.Handler {
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rh := &raftHandler{
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stats: server,
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server: server,
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clusterInfo: server.Cluster,
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}
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mh := &peerMembersHandler{
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clusterInfo: server.Cluster,
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}
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mux := http.NewServeMux()
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mux.HandleFunc("/", http.NotFound)
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mux.Handle(raftPrefix, rh)
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mux.Handle(peerMembersPrefix, mh)
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return mux
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}
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type raftHandler struct {
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stats etcdserver.Stats
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server etcdserver.Server
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clusterInfo etcdserver.ClusterInfo
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}
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func (h *raftHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if !allowMethod(w, r.Method, "POST") {
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return
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}
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wcid := strconv.FormatUint(h.clusterInfo.ID(), 16)
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w.Header().Set("X-Etcd-Cluster-ID", wcid)
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gcid := r.Header.Get("X-Etcd-Cluster-ID")
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if gcid != wcid {
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log.Printf("etcdhttp: request ignored due to cluster ID mismatch got %s want %s", gcid, wcid)
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http.Error(w, "clusterID mismatch", http.StatusPreconditionFailed)
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return
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}
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b, err := ioutil.ReadAll(r.Body)
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if err != nil {
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log.Println("etcdhttp: error reading raft message:", err)
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http.Error(w, "error reading raft message", http.StatusBadRequest)
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return
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}
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var m raftpb.Message
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if err := m.Unmarshal(b); err != nil {
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log.Println("etcdhttp: error unmarshaling raft message:", err)
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http.Error(w, "error unmarshaling raft message", http.StatusBadRequest)
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return
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}
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if err := h.server.Process(context.TODO(), m); err != nil {
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log.Println("etcdhttp: error processing raft message:", err)
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switch err {
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case etcdserver.ErrRemoved:
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http.Error(w, "cannot process message from removed node", http.StatusForbidden)
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default:
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writeError(w, err)
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}
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return
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}
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if m.Type == raftpb.MsgApp {
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h.stats.UpdateRecvApp(m.From, r.ContentLength)
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}
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w.WriteHeader(http.StatusNoContent)
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}
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type peerMembersHandler struct {
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clusterInfo etcdserver.ClusterInfo
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}
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func (h *peerMembersHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if !allowMethod(w, r.Method, "GET") {
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return
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}
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cid := strconv.FormatUint(h.clusterInfo.ID(), 16)
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w.Header().Set("X-Etcd-Cluster-ID", cid)
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if r.URL.Path != peerMembersPrefix {
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http.Error(w, "bad path", http.StatusBadRequest)
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return
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}
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ms := h.clusterInfo.Members()
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w.Header().Set("Content-Type", "application/json")
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if err := json.NewEncoder(w).Encode(ms); err != nil {
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log.Printf("etcdhttp: %v", err)
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}
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}
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