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// Copyright 2015 The etcd Authors
//
// 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"
"fmt"
"net/http"
"strconv"
"strings"
"go.etcd.io/etcd/client/pkg/v3/types"
"go.etcd.io/etcd/server/v3/etcdserver"
"go.etcd.io/etcd/server/v3/etcdserver/api"
"go.etcd.io/etcd/server/v3/etcdserver/api/membership"
"go.etcd.io/etcd/server/v3/etcdserver/api/rafthttp"
"go.etcd.io/etcd/server/v3/lease/leasehttp"
"go.uber.org/zap"
)
const (
peerMembersPath = "/members"
peerMemberPromotePrefix = "/members/promote/"
)
// NewPeerHandler generates an http.Handler to handle etcd peer requests.
func NewPeerHandler(lg *zap.Logger, s etcdserver.ServerPeerV2) http.Handler {
return newPeerHandler(lg, s, s.RaftHandler(), s.LeaseHandler(), s.HashKVHandler(), s.DowngradeEnabledHandler())
}
func newPeerHandler(
lg *zap.Logger,
s etcdserver.Server,
raftHandler http.Handler,
leaseHandler http.Handler,
hashKVHandler http.Handler,
downgradeEnabledHandler http.Handler,
) http.Handler {
if lg == nil {
lg = zap.NewNop()
}
peerMembersHandler := newPeerMembersHandler(lg, s.Cluster())
peerMemberPromoteHandler := newPeerMemberPromoteHandler(lg, s)
mux := http.NewServeMux()
mux.HandleFunc("/", http.NotFound)
mux.Handle(rafthttp.RaftPrefix, raftHandler)
mux.Handle(rafthttp.RaftPrefix+"/", raftHandler)
mux.Handle(peerMembersPath, peerMembersHandler)
mux.Handle(peerMemberPromotePrefix, peerMemberPromoteHandler)
if leaseHandler != nil {
mux.Handle(leasehttp.LeasePrefix, leaseHandler)
mux.Handle(leasehttp.LeaseInternalPrefix, leaseHandler)
}
if downgradeEnabledHandler != nil {
mux.Handle(etcdserver.DowngradeEnabledPath, downgradeEnabledHandler)
}
if hashKVHandler != nil {
mux.Handle(etcdserver.PeerHashKVPath, hashKVHandler)
}
mux.HandleFunc(versionPath, versionHandler(s.Cluster(), serveVersion))
return mux
}
func newPeerMembersHandler(lg *zap.Logger, cluster api.Cluster) http.Handler {
return &peerMembersHandler{
lg: lg,
cluster: cluster,
}
}
type peerMembersHandler struct {
lg *zap.Logger
cluster api.Cluster
}
func newPeerMemberPromoteHandler(lg *zap.Logger, s etcdserver.Server) http.Handler {
return &peerMemberPromoteHandler{
lg: lg,
cluster: s.Cluster(),
server: s,
}
}
type peerMemberPromoteHandler struct {
lg *zap.Logger
cluster api.Cluster
server etcdserver.Server
}
func (h *peerMembersHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !allowMethod(w, r, "GET") {
return
}
w.Header().Set("X-Etcd-Cluster-ID", h.cluster.ID().String())
if r.URL.Path != peerMembersPath {
http.Error(w, "bad path", http.StatusBadRequest)
return
}
ms := h.cluster.Members()
w.Header().Set("Content-Type", "application/json")
if err := json.NewEncoder(w).Encode(ms); err != nil {
h.lg.Warn("failed to encode membership members", zap.Error(err))
}
}
func (h *peerMemberPromoteHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !allowMethod(w, r, "POST") {
return
}
w.Header().Set("X-Etcd-Cluster-ID", h.cluster.ID().String())
if !strings.HasPrefix(r.URL.Path, peerMemberPromotePrefix) {
http.Error(w, "bad path", http.StatusBadRequest)
return
}
idStr := strings.TrimPrefix(r.URL.Path, peerMemberPromotePrefix)
id, err := strconv.ParseUint(idStr, 10, 64)
if err != nil {
http.Error(w, fmt.Sprintf("member %s not found in cluster", idStr), http.StatusNotFound)
return
}
resp, err := h.server.PromoteMember(r.Context(), id)
if err != nil {
switch err {
case membership.ErrIDNotFound:
http.Error(w, err.Error(), http.StatusNotFound)
case membership.ErrMemberNotLearner:
http.Error(w, err.Error(), http.StatusPreconditionFailed)
case etcdserver.ErrLearnerNotReady:
http.Error(w, err.Error(), http.StatusPreconditionFailed)
default:
WriteError(h.lg, w, r, err)
}
h.lg.Warn(
"failed to promote a member",
zap.String("member-id", types.ID(id).String()),
zap.Error(err),
)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
h.lg.Warn("failed to encode members response", zap.Error(err))
}
}
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