mirror of
https://github.com/etcd-io/etcd.git
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124 lines
3.3 KiB
Go
124 lines
3.3 KiB
Go
// Copyright 2015 The etcd Authors
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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 main
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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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"strconv"
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"go.etcd.io/etcd/raft/raftpb"
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)
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// Handler for a http based key-value store backed by raft
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type httpKVAPI struct {
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store *kvstore
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confChangeC chan<- raftpb.ConfChange
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}
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func (h *httpKVAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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key := r.RequestURI
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defer r.Body.Close()
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switch {
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case r.Method == "PUT":
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v, err := ioutil.ReadAll(r.Body)
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if err != nil {
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log.Printf("Failed to read on PUT (%v)\n", err)
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http.Error(w, "Failed on PUT", http.StatusBadRequest)
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return
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}
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h.store.Propose(key, string(v))
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// Optimistic-- no waiting for ack from raft. Value is not yet
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// committed so a subsequent GET on the key may return old value
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w.WriteHeader(http.StatusNoContent)
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case r.Method == "GET":
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if v, ok := h.store.Lookup(key); ok {
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w.Write([]byte(v))
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} else {
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http.Error(w, "Failed to GET", http.StatusNotFound)
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}
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case r.Method == "POST":
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url, err := ioutil.ReadAll(r.Body)
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if err != nil {
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log.Printf("Failed to read on POST (%v)\n", err)
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http.Error(w, "Failed on POST", http.StatusBadRequest)
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return
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}
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nodeId, err := strconv.ParseUint(key[1:], 0, 64)
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if err != nil {
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log.Printf("Failed to convert ID for conf change (%v)\n", err)
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http.Error(w, "Failed on POST", http.StatusBadRequest)
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return
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}
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cc := raftpb.ConfChange{
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Type: raftpb.ConfChangeAddNode,
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NodeID: nodeId,
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Context: url,
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}
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h.confChangeC <- cc
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// As above, optimistic that raft will apply the conf change
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w.WriteHeader(http.StatusNoContent)
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case r.Method == "DELETE":
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nodeId, err := strconv.ParseUint(key[1:], 0, 64)
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if err != nil {
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log.Printf("Failed to convert ID for conf change (%v)\n", err)
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http.Error(w, "Failed on DELETE", http.StatusBadRequest)
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return
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}
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cc := raftpb.ConfChange{
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Type: raftpb.ConfChangeRemoveNode,
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NodeID: nodeId,
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}
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h.confChangeC <- cc
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// As above, optimistic that raft will apply the conf change
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w.WriteHeader(http.StatusNoContent)
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default:
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w.Header().Set("Allow", "PUT")
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w.Header().Add("Allow", "GET")
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w.Header().Add("Allow", "POST")
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w.Header().Add("Allow", "DELETE")
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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}
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}
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// serveHttpKVAPI starts a key-value server with a GET/PUT API and listens.
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func serveHttpKVAPI(kv *kvstore, port int, confChangeC chan<- raftpb.ConfChange, errorC <-chan error) {
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srv := http.Server{
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Addr: ":" + strconv.Itoa(port),
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Handler: &httpKVAPI{
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store: kv,
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confChangeC: confChangeC,
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},
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}
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go func() {
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if err := srv.ListenAndServe(); err != nil {
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log.Fatal(err)
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}
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}()
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// exit when raft goes down
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if err, ok := <-errorC; ok {
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log.Fatal(err)
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}
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}
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