194 lines
5.0 KiB
Go
194 lines
5.0 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package rafthttp
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import (
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"io/ioutil"
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"log"
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"net/http"
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"path"
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"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
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pioutil "github.com/coreos/etcd/pkg/ioutil"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/etcd/raft/raftpb"
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)
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const (
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ConnReadLimitByte = 64 * 1024
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)
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var (
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RaftPrefix = "/raft"
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RaftStreamPrefix = path.Join(RaftPrefix, "stream")
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)
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func NewHandler(r Raft, cid types.ID) http.Handler {
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return &handler{
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r: r,
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cid: cid,
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}
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}
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func newStreamHandler(tr *transport, id, cid types.ID) http.Handler {
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return &streamHandler{
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tr: tr,
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id: id,
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cid: cid,
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}
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}
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type writerToResponse interface {
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WriteTo(w http.ResponseWriter)
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}
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type handler struct {
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r Raft
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cid types.ID
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}
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func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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w.Header().Set("Allow", "POST")
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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wcid := h.cid.String()
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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("rafthttp: 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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// Limit the data size that could be read from the request body, which ensures that read from
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// connection will not time out accidentally due to possible block in underlying implementation.
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limitedr := pioutil.NewLimitedBufferReader(r.Body, ConnReadLimitByte)
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b, err := ioutil.ReadAll(limitedr)
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if err != nil {
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log.Println("rafthttp: 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("rafthttp: 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.r.Process(context.TODO(), m); err != nil {
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switch v := err.(type) {
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case writerToResponse:
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v.WriteTo(w)
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default:
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log.Printf("rafthttp: error processing raft message: %v", err)
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http.Error(w, "error processing raft message", http.StatusInternalServerError)
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}
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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type streamHandler struct {
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tr *transport
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id types.ID
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cid types.ID
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}
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func (h *streamHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if r.Method != "GET" {
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w.Header().Set("Allow", "GET")
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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var t streamType
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switch path.Dir(r.URL.Path) {
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case path.Join(RaftStreamPrefix, string(streamTypeMsgApp)):
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t = streamTypeMsgApp
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case path.Join(RaftStreamPrefix, string(streamTypeMessage)):
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t = streamTypeMessage
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// backward compatibility
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case RaftStreamPrefix:
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t = streamTypeMsgApp
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default:
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log.Printf("rafthttp: ignored unexpected streaming request path %s", r.URL.Path)
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http.Error(w, "invalid path", http.StatusNotFound)
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return
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}
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fromStr := path.Base(r.URL.Path)
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from, err := types.IDFromString(fromStr)
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if err != nil {
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log.Printf("rafthttp: failed to parse from %s into ID", fromStr)
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http.Error(w, "invalid from", http.StatusNotFound)
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return
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}
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p := h.tr.Peer(from)
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if p == nil {
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log.Printf("rafthttp: fail to find sender %s", from)
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http.Error(w, "error sender not found", http.StatusNotFound)
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return
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}
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wcid := h.cid.String()
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if gcid := r.Header.Get("X-Etcd-Cluster-ID"); gcid != wcid {
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log.Printf("rafthttp: streaming 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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wto := h.id.String()
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if gto := r.Header.Get("X-Raft-To"); gto != wto {
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log.Printf("rafthttp: streaming request ignored due to ID mismatch got %s want %s", gto, wto)
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http.Error(w, "to field mismatch", http.StatusPreconditionFailed)
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return
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}
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w.WriteHeader(http.StatusOK)
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w.(http.Flusher).Flush()
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c := newCloseNotifier()
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conn := &outgoingConn{
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t: t,
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termStr: r.Header.Get("X-Raft-Term"),
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Writer: w,
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Flusher: w.(http.Flusher),
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Closer: c,
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}
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p.attachOutgoingConn(conn)
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<-c.closeNotify()
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}
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type closeNotifier struct {
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done chan struct{}
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}
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func newCloseNotifier() *closeNotifier {
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return &closeNotifier{
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done: make(chan struct{}),
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}
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}
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func (n *closeNotifier) Close() error {
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close(n.done)
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return nil
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}
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func (n *closeNotifier) closeNotify() <-chan struct{} { return n.done }
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