mirror of https://github.com/Askill/r_place.git
158 lines
3.4 KiB
Go
158 lines
3.4 KiB
Go
package main
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import (
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"encoding/json"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strconv"
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"time"
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"github.com/gorilla/websocket"
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)
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var upgrader = websocket.Upgrader{
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ReadBufferSize: 4096,
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WriteBufferSize: 4096,
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}
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const (
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// Time allowed to write a message to the peer.
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writeWait = 10 * time.Second
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// Time allowed to read the next pong message from the peer.
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pongWait = 60 * time.Second
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// Send pings to peer with this period. Must be less than pongWait.
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pingPeriod = (pongWait * 9) / 10
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// Maximum message size allowed from peer.
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maxMessageSize = 512
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)
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var img = GetImage(1000, 1000)
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var tmpImage = GetImage(img.Width, img.Height)
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func get(w http.ResponseWriter, r *http.Request) {
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c, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Print("error while upgrading", err)
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return
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}
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c.SetReadLimit(maxMessageSize)
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c.SetPongHandler(func(string) error { c.SetReadDeadline(time.Now().Add(pongWait)); return nil })
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defer c.Close()
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ticker := time.NewTicker(1 * time.Second)
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for range ticker.C {
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diff := tmpImage.GetDiff(&img)
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for i := 0; i < int(diff.Width*diff.Height); i++ {
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pix := diff.Pixels[i]
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if pix.Pixel.UserID != 0 {
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x := i / int(diff.Width)
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y := i % int(diff.Height)
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msg := Message{X: uint32(x), Y: uint32(y), Timestamp: pix.Pixel.Timestamp, UserID: pix.Pixel.UserID, Color: pix.Pixel.Color}
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marshalMsg, err := json.Marshal(msg)
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if err != nil {
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log.Println("error while writing image", err)
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break
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}
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err = c.WriteMessage(1, marshalMsg)
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_, msg2, _ := c.ReadMessage()
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_ = msg2
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}
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}
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if err := c.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
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return
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}
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copy(tmpImage.Pixels, img.Pixels)
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}
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}
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func getAll(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(img)
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}
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func set(w http.ResponseWriter, r *http.Request) {
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c, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Print("error while upgrading", err)
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return
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}
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c.SetReadLimit(maxMessageSize)
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c.SetPongHandler(func(string) error { c.SetReadDeadline(time.Now().Add(pongWait)); return nil })
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defer c.Close()
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for {
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mt, msg, err := c.ReadMessage()
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if err != nil {
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log.Println("read:", err)
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break
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}
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if mt == websocket.PingMessage {
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continue
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}
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message := Message{}
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json.Unmarshal(msg, &message)
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status := img.SetPixel(message)
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err = c.WriteMessage(1, []byte(strconv.Itoa(status)))
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}
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}
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func loadState(img *image, path string) {
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stateJSON, err := os.Open(path)
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if err != nil {
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fmt.Println(err)
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return
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}
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defer stateJSON.Close()
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byteValue, _ := ioutil.ReadAll(stateJSON)
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json.Unmarshal(byteValue, &img)
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}
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func saveState(img *image, path string, period time.Duration) {
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ticker := time.NewTicker(period * time.Second)
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for range ticker.C {
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imgJSON, _ := json.Marshal(img)
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file, err := os.Create(path)
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if err != nil {
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return
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}
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defer file.Close()
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file.WriteString(string(imgJSON))
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if err != nil {
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fmt.Println("Could not save state")
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fmt.Println(err)
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}
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}
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}
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func main() {
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var addr = flag.String("addr", "localhost:8080", "http service address")
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flag.Parse()
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log.SetFlags(0)
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log.Println("starting server on", *addr)
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cachePath := "./state.json"
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loadState(&img, cachePath)
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go saveState(&img, cachePath, 10)
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http.HandleFunc("/get", get)
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http.HandleFunc("/getAll", getAll)
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http.HandleFunc("/set", set)
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log.Fatal(http.ListenAndServe(*addr, nil))
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}
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