go.etcd.io/etcd@v3.3.27+incompatible/etcdserver/api/etcdhttp/peer.go (about)

     1  // Copyright 2015 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package etcdhttp
    16  
    17  import (
    18  	"encoding/json"
    19  	"net/http"
    20  
    21  	"github.com/coreos/etcd/etcdserver"
    22  	"github.com/coreos/etcd/etcdserver/api"
    23  	"github.com/coreos/etcd/lease/leasehttp"
    24  	"github.com/coreos/etcd/rafthttp"
    25  )
    26  
    27  const (
    28  	peerMembersPrefix = "/members"
    29  )
    30  
    31  // NewPeerHandler generates an http.Handler to handle etcd peer requests.
    32  func NewPeerHandler(s etcdserver.ServerPeer) http.Handler {
    33  	return newPeerHandler(s.Cluster(), s.RaftHandler(), s.LeaseHandler())
    34  }
    35  
    36  func newPeerHandler(cluster api.Cluster, raftHandler http.Handler, leaseHandler http.Handler) http.Handler {
    37  	mh := &peerMembersHandler{
    38  		cluster: cluster,
    39  	}
    40  
    41  	mux := http.NewServeMux()
    42  	mux.HandleFunc("/", http.NotFound)
    43  	mux.Handle(rafthttp.RaftPrefix, raftHandler)
    44  	mux.Handle(rafthttp.RaftPrefix+"/", raftHandler)
    45  	mux.Handle(peerMembersPrefix, mh)
    46  	if leaseHandler != nil {
    47  		mux.Handle(leasehttp.LeasePrefix, leaseHandler)
    48  		mux.Handle(leasehttp.LeaseInternalPrefix, leaseHandler)
    49  	}
    50  	mux.HandleFunc(versionPath, versionHandler(cluster, serveVersion))
    51  	return mux
    52  }
    53  
    54  type peerMembersHandler struct {
    55  	cluster api.Cluster
    56  }
    57  
    58  func (h *peerMembersHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    59  	if !allowMethod(w, r, "GET") {
    60  		return
    61  	}
    62  	w.Header().Set("X-Etcd-Cluster-ID", h.cluster.ID().String())
    63  
    64  	if r.URL.Path != peerMembersPrefix {
    65  		http.Error(w, "bad path", http.StatusBadRequest)
    66  		return
    67  	}
    68  	ms := h.cluster.Members()
    69  	w.Header().Set("Content-Type", "application/json")
    70  	if err := json.NewEncoder(w).Encode(ms); err != nil {
    71  		plog.Warningf("failed to encode members response (%v)", err)
    72  	}
    73  }