mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
// Copyright 2020 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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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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)
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type value struct {
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val string
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version int64
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}
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var data = make(map[string]*value)
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type request struct {
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Op string `json:"op"`
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Key string `json:"key"`
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Val string `json:"val"`
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Version int64 `json:"version"`
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}
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type response struct {
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Val string `json:"val"`
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Version int64 `json:"version"`
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Err string `json:"err"`
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}
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func writeResponse(resp response, w http.ResponseWriter) {
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wBytes, err := json.Marshal(resp)
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if err != nil {
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fmt.Printf("failed to marshal json: %s\n", err)
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os.Exit(1)
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}
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_, err = w.Write(wBytes)
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if err != nil {
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fmt.Printf("failed to write a response: %s\n", err)
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os.Exit(1)
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}
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}
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func handler(w http.ResponseWriter, r *http.Request) {
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rBytes, err := ioutil.ReadAll(r.Body)
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if err != nil {
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fmt.Printf("failed to read http request: %s\n", err)
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os.Exit(1)
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}
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var req request
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err = json.Unmarshal(rBytes, &req)
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if err != nil {
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fmt.Printf("failed to unmarshal json: %s\n", err)
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os.Exit(1)
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}
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if strings.Compare(req.Op, "read") == 0 {
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if val, ok := data[req.Key]; ok {
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writeResponse(response{val.val, val.version, ""}, w)
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} else {
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writeResponse(response{"", -1, "key not found"}, w)
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}
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} else if strings.Compare(req.Op, "write") == 0 {
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if val, ok := data[req.Key]; ok {
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if req.Version != val.version {
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writeResponse(response{"", -1, fmt.Sprintf("given version (%d) is different from the existing version (%d)", req.Version, val.version)}, w)
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} else {
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data[req.Key].val = req.Val
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data[req.Key].version = req.Version
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writeResponse(response{req.Val, req.Version, ""}, w)
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}
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} else {
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data[req.Key] = &value{req.Val, req.Version}
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writeResponse(response{req.Val, req.Version, ""}, w)
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}
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} else {
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fmt.Printf("unknown op: %s\n", req.Op)
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return
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}
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}
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func main() {
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http.HandleFunc("/", handler)
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http.ListenAndServe(":8080", nil)
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}
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