swh:1:snp:272e298efac7922bc58929ef447c6a9add2959f8
Tip revision: 9481945228b97c5d019596b921d8b03833964d9e authored by Yicheng Qin on 11 March 2015, 18:33:43 UTC
*: bump to v2.0.5
*: bump to v2.0.5
Tip revision: 9481945
http.go
// Copyright 2015 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 rafthttp
import (
"io/ioutil"
"log"
"net/http"
"path"
"strconv"
"strings"
pioutil "github.com/coreos/etcd/pkg/ioutil"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/raft/raftpb"
"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
)
const (
ConnReadLimitByte = 64 * 1024
)
var (
RaftPrefix = "/raft"
RaftStreamPrefix = path.Join(RaftPrefix, "stream")
)
func NewHandler(r Raft, cid types.ID) http.Handler {
return &handler{
r: r,
cid: cid,
}
}
// NewStreamHandler returns a handler which initiates streamer when receiving
// stream request from follower.
func NewStreamHandler(tr *transport, id, cid types.ID) http.Handler {
return &streamHandler{
tr: tr,
id: id,
cid: cid,
}
}
type handler struct {
r Raft
cid types.ID
}
func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
w.Header().Set("Allow", "POST")
http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
return
}
wcid := h.cid.String()
w.Header().Set("X-Etcd-Cluster-ID", wcid)
gcid := r.Header.Get("X-Etcd-Cluster-ID")
if gcid != wcid {
log.Printf("rafthttp: request ignored due to cluster ID mismatch got %s want %s", gcid, wcid)
http.Error(w, "clusterID mismatch", http.StatusPreconditionFailed)
return
}
// Limit the data size that could be read from the request body, which ensures that read from
// connection will not time out accidentally due to possible block in underlying implementation.
limitedr := pioutil.NewLimitedBufferReader(r.Body, ConnReadLimitByte)
b, err := ioutil.ReadAll(limitedr)
if err != nil {
log.Println("rafthttp: 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("rafthttp: error unmarshaling raft message:", err)
http.Error(w, "error unmarshaling raft message", http.StatusBadRequest)
return
}
if err := h.r.Process(context.TODO(), m); err != nil {
switch v := err.(type) {
case writerToResponse:
v.WriteTo(w)
default:
log.Printf("rafthttp: error processing raft message: %v", err)
http.Error(w, "error processing raft message", http.StatusInternalServerError)
}
return
}
w.WriteHeader(http.StatusNoContent)
}
type streamHandler struct {
tr *transport
id types.ID
cid types.ID
}
func (h *streamHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
w.Header().Set("Allow", "GET")
http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
return
}
fromStr := strings.TrimPrefix(r.URL.Path, RaftStreamPrefix+"/")
from, err := types.IDFromString(fromStr)
if err != nil {
log.Printf("rafthttp: path %s cannot be parsed", fromStr)
http.Error(w, "invalid path", http.StatusNotFound)
return
}
p := h.tr.Peer(from)
if p == nil {
log.Printf("rafthttp: fail to find sender %s", from)
http.Error(w, "error sender not found", http.StatusNotFound)
return
}
wcid := h.cid.String()
if gcid := r.Header.Get("X-Etcd-Cluster-ID"); gcid != wcid {
log.Printf("rafthttp: streaming request ignored due to cluster ID mismatch got %s want %s", gcid, wcid)
http.Error(w, "clusterID mismatch", http.StatusPreconditionFailed)
return
}
wto := h.id.String()
if gto := r.Header.Get("X-Raft-To"); gto != wto {
log.Printf("rafthttp: streaming request ignored due to ID mismatch got %s want %s", gto, wto)
http.Error(w, "to field mismatch", http.StatusPreconditionFailed)
return
}
termStr := r.Header.Get("X-Raft-Term")
term, err := strconv.ParseUint(termStr, 10, 64)
if err != nil {
log.Printf("rafthttp: streaming request ignored due to parse term %s error: %v", termStr, err)
http.Error(w, "invalid term field", http.StatusBadRequest)
return
}
sw := newStreamWriter(from, term)
err = p.attachStream(sw)
if err != nil {
log.Printf("rafthttp: %v", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusOK)
w.(http.Flusher).Flush()
go sw.handle(w.(WriteFlusher))
<-sw.stopNotify()
}
type writerToResponse interface {
WriteTo(w http.ResponseWriter)
}