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peer.go
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peer.go
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/*
Copyright 2014 CoreOS, 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 etcdhttp
import (
"encoding/json"
"io/ioutil"
"log"
"net/http"
"github.com/coreos/etcd/Godeps/_workspace/src/code.google.com/p/go.net/context"
"github.com/coreos/etcd/etcdserver"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/raft/raftpb"
)
const (
raftPrefix = "/raft"
peerMembersPrefix = "/members"
)
// NewPeerHandler generates an http.Handler to handle etcd peer (raft) requests.
func NewPeerHandler(server *etcdserver.EtcdServer) http.Handler {
rh := &raftHandler{
stats: server,
server: server,
clusterInfo: server.Cluster,
}
mh := &peerMembersHandler{
clusterInfo: server.Cluster,
}
mux := http.NewServeMux()
mux.HandleFunc("/", http.NotFound)
mux.Handle(raftPrefix, rh)
mux.Handle(peerMembersPrefix, mh)
return mux
}
type raftHandler struct {
stats etcdserver.Stats
server etcdserver.Server
clusterInfo etcdserver.ClusterInfo
}
func (h *raftHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !allowMethod(w, r.Method, "POST") {
return
}
wcid := h.clusterInfo.ID().String()
w.Header().Set("X-Etcd-Cluster-ID", wcid)
gcid := r.Header.Get("X-Etcd-Cluster-ID")
if gcid != wcid {
log.Printf("etcdhttp: request ignored due to cluster ID mismatch got %s want %s", gcid, wcid)
http.Error(w, "clusterID mismatch", http.StatusPreconditionFailed)
return
}
b, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Println("etcdhttp: error reading raft message:", err)
http.Error(w, "error reading raft message", http.StatusBadRequest)
return
}
var m raftpb.Message
if err := m.Unmarshal(b); err != nil {
log.Println("etcdhttp: error unmarshaling raft message:", err)
http.Error(w, "error unmarshaling raft message", http.StatusBadRequest)
return
}
if err := h.server.Process(context.TODO(), m); err != nil {
switch err {
case etcdserver.ErrRemoved:
log.Printf("etcdhttp: reject message from removed member %s", types.ID(m.From).String())
http.Error(w, "cannot process message from removed member", http.StatusForbidden)
default:
writeError(w, err)
}
return
}
if m.Type == raftpb.MsgApp {
h.stats.UpdateRecvApp(types.ID(m.From), r.ContentLength)
}
w.WriteHeader(http.StatusNoContent)
}
type peerMembersHandler struct {
clusterInfo etcdserver.ClusterInfo
}
func (h *peerMembersHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !allowMethod(w, r.Method, "GET") {
return
}
w.Header().Set("X-Etcd-Cluster-ID", h.clusterInfo.ID().String())
if r.URL.Path != peerMembersPrefix {
http.Error(w, "bad path", http.StatusBadRequest)
return
}
ms := h.clusterInfo.Members()
w.Header().Set("Content-Type", "application/json")
if err := json.NewEncoder(w).Encode(ms); err != nil {
log.Printf("etcdhttp: %v", err)
}
}