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http.go
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http.go
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// 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 (
"errors"
"io/ioutil"
"net/http"
"path"
"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
pioutil "github.com/coreos/etcd/pkg/ioutil"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/raft/raftpb"
"github.com/coreos/etcd/version"
)
const (
ConnReadLimitByte = 64 * 1024
)
var (
RaftPrefix = "/raft"
ProbingPrefix = path.Join(RaftPrefix, "probing")
RaftStreamPrefix = path.Join(RaftPrefix, "stream")
errIncompatibleVersion = errors.New("incompatible version")
errClusterIDMismatch = errors.New("cluster ID mismatch")
)
func NewHandler(r Raft, cid types.ID) http.Handler {
return &handler{
r: r,
cid: cid,
}
}
type peerGetter interface {
Get(id types.ID) Peer
}
func newStreamHandler(peerGetter peerGetter, r Raft, id, cid types.ID) http.Handler {
return &streamHandler{
peerGetter: peerGetter,
r: r,
id: id,
cid: cid,
}
}
type writerToResponse interface {
WriteTo(w http.ResponseWriter)
}
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
}
if err := checkVersionCompability(r.Header.Get("X-Server-From"), serverVersion(r.Header), minClusterVersion(r.Header)); err != nil {
plog.Errorf("request received was ignored (%v)", err)
http.Error(w, errIncompatibleVersion.Error(), http.StatusPreconditionFailed)
return
}
wcid := h.cid.String()
w.Header().Set("X-Etcd-Cluster-ID", wcid)
gcid := r.Header.Get("X-Etcd-Cluster-ID")
if gcid != wcid {
plog.Errorf("request received was ignored (cluster ID mismatch got %s want %s)", gcid, wcid)
http.Error(w, errClusterIDMismatch.Error(), 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 {
plog.Errorf("failed to read raft message (%v)", err)
http.Error(w, "error reading raft message", http.StatusBadRequest)
return
}
var m raftpb.Message
if err := m.Unmarshal(b); err != nil {
plog.Errorf("failed to unmarshal raft message (%v)", 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:
plog.Warningf("failed to process raft message (%v)", err)
http.Error(w, "error processing raft message", http.StatusInternalServerError)
}
return
}
// Write StatusNoContet header after the message has been processed by
// raft, which faciliates the client to report MsgSnap status.
w.WriteHeader(http.StatusNoContent)
}
type streamHandler struct {
peerGetter peerGetter
r Raft
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
}
w.Header().Set("X-Server-Version", version.Version)
if err := checkVersionCompability(r.Header.Get("X-Server-From"), serverVersion(r.Header), minClusterVersion(r.Header)); err != nil {
plog.Errorf("request received was ignored (%v)", err)
http.Error(w, errIncompatibleVersion.Error(), http.StatusPreconditionFailed)
return
}
wcid := h.cid.String()
w.Header().Set("X-Etcd-Cluster-ID", wcid)
if gcid := r.Header.Get("X-Etcd-Cluster-ID"); gcid != wcid {
plog.Errorf("streaming request ignored (cluster ID mismatch got %s want %s)", gcid, wcid)
http.Error(w, errClusterIDMismatch.Error(), http.StatusPreconditionFailed)
return
}
var t streamType
switch path.Dir(r.URL.Path) {
// backward compatibility
case RaftStreamPrefix:
t = streamTypeMsgApp
case path.Join(RaftStreamPrefix, string(streamTypeMsgApp)):
t = streamTypeMsgAppV2
case path.Join(RaftStreamPrefix, string(streamTypeMessage)):
t = streamTypeMessage
default:
plog.Debugf("ignored unexpected streaming request path %s", r.URL.Path)
http.Error(w, "invalid path", http.StatusNotFound)
return
}
fromStr := path.Base(r.URL.Path)
from, err := types.IDFromString(fromStr)
if err != nil {
plog.Errorf("failed to parse from %s into ID (%v)", fromStr, err)
http.Error(w, "invalid from", http.StatusNotFound)
return
}
if h.r.IsIDRemoved(uint64(from)) {
plog.Warningf("rejected the stream from peer %s since it was removed", from)
http.Error(w, "removed member", http.StatusGone)
return
}
p := h.peerGetter.Get(from)
if p == nil {
// This may happen in following cases:
// 1. user starts a remote peer that belongs to a different cluster
// with the same cluster ID.
// 2. local etcd falls behind of the cluster, and cannot recognize
// the members that joined after its current progress.
plog.Errorf("failed to find member %s in cluster %s", from, wcid)
http.Error(w, "error sender not found", http.StatusNotFound)
return
}
wto := h.id.String()
if gto := r.Header.Get("X-Raft-To"); gto != wto {
plog.Errorf("streaming request ignored (ID mismatch got %s want %s)", gto, wto)
http.Error(w, "to field mismatch", http.StatusPreconditionFailed)
return
}
w.WriteHeader(http.StatusOK)
w.(http.Flusher).Flush()
c := newCloseNotifier()
conn := &outgoingConn{
t: t,
termStr: r.Header.Get("X-Raft-Term"),
Writer: w,
Flusher: w.(http.Flusher),
Closer: c,
}
p.attachOutgoingConn(conn)
<-c.closeNotify()
}
type closeNotifier struct {
done chan struct{}
}
func newCloseNotifier() *closeNotifier {
return &closeNotifier{
done: make(chan struct{}),
}
}
func (n *closeNotifier) Close() error {
close(n.done)
return nil
}
func (n *closeNotifier) closeNotify() <-chan struct{} { return n.done }