/
client.go
155 lines (128 loc) · 3.27 KB
/
client.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/cznic/sortutil"
"github.com/drone/routes"
"github.com/spaolacci/murmur3"
)
type MapValueResponse struct {
Key string `json:"key"`
Value string `json:"value"`
}
var nodeMap map[uint64]string
var keys sortutil.Uint64Slice
func main() {
nodeMap = make(map[uint64]string)
FirstNode := "http://localhost:3000/"
SecondNode := "http://localhost:3001/"
ThirdNode := "http://localhost:3002/"
keys = append(keys, murmur3.Sum64([]byte(FirstNode)))
keys = append(keys, murmur3.Sum64([]byte(SecondNode)))
keys = append(keys, murmur3.Sum64([]byte(ThirdNode)))
keys.Sort()
fmt.Println("Keys array is : ", keys)
for _, element := range keys {
switch element {
case murmur3.Sum64([]byte(FirstNode)):
nodeMap[element] = FirstNode
case murmur3.Sum64([]byte(SecondNode)):
nodeMap[element] = SecondNode
case murmur3.Sum64([]byte(ThirdNode)):
nodeMap[element] = ThirdNode
}
}
mux := routes.New()
mux.Put("/keys/:keyID/:value", PutValue)
mux.Get("/keys/:keyID", RetrieveValue)
http.Handle("/", mux)
http.ListenAndServe(":8080", nil)
}
func getNode(key string) string {
keyHash := murmur3.Sum64([]byte(key))
var returnIndex = len(keys) - 1
for index, element := range keys {
if keyHash < element {
if index > 0 {
returnIndex = index - 1
}
break
}
}
return nodeMap[keys[returnIndex]]
}
func PutValue(w http.ResponseWriter, r *http.Request) {
fmt.Println("Entered insertvalue")
key := r.URL.Query().Get(":keyID")
value := r.URL.Query().Get(":value")
address := getNode(key)
var Mybuffer bytes.Buffer
Mybuffer.WriteString(address)
Mybuffer.WriteString("keys")
Mybuffer.WriteString("/")
Mybuffer.WriteString(key)
Mybuffer.WriteString("/")
Mybuffer.WriteString(value)
//Create a request
req, err := http.NewRequest("PUT", Mybuffer.String(), nil)
if err != nil {
panic(err)
}
client1 := &http.Client{}
resp, err := client1.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
w.WriteHeader(resp.StatusCode)
if resp.StatusCode != http.StatusOK {
fmt.Println("Data was not persisted")
panic(err.Error())
} else {
fmt.Println("Key : ", key, " || Value : ", value, " --- added to node : ", address)
}
}
func RetrieveValue(w http.ResponseWriter, r *http.Request) {
key := r.URL.Query().Get(":keyID")
address := getNode(key)
var Mybuffer bytes.Buffer
Mybuffer.WriteString(address)
Mybuffer.WriteString("keys")
Mybuffer.WriteString("/")
Mybuffer.WriteString(key)
//Create a request
req, err := http.NewRequest("GET", Mybuffer.String(), nil)
if err != nil {
panic(err)
}
client1 := &http.Client{}
resp, err := client1.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusOK {
var MyResponse MapValueResponse
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err.Error())
}
err = json.Unmarshal(body, &MyResponse)
if err != nil {
panic(err.Error())
}
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "application/json")
MyoutputJSON, err := json.Marshal(MyResponse)
if err != nil {
panic(err.Error())
}
fmt.Println("Retrieved from node : ", address, " for key : ", key)
w.Write(MyoutputJSON)
} else {
w.WriteHeader(resp.StatusCode)
}
}