mirror of https://github.com/Askill/r_place.git
85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
package main
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import (
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"encoding/json"
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"flag"
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"log"
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"net/http"
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"sync"
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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: 2048,
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WriteBufferSize: 2048,
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}
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var img = GetImage(10, 10)
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func write(ticker time.Ticker, c *websocket.Conn, wg *sync.WaitGroup) {
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defer wg.Done()
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var tmpImage = GetImage(img.width, img.height)
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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.UserID != 0 {
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x := uint16(i / int(diff.Width))
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y := uint16(i % int(diff.Height))
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msg := Message{X: x, Y: y, Timestamp: pix.Timestamp, UserID: pix.UserID, Color: pix.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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}
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}
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copy(img.pixels, tmpImage.pixels)
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}
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}
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func read(c *websocket.Conn, wg *sync.WaitGroup) {
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defer wg.Done()
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for {
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_, 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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message := Message{}
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message.JsonToStruct(msg)
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img.SetPixel(message)
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}
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}
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func serve(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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defer c.Close()
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ticker := time.NewTicker(1 * time.Second)
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var wg sync.WaitGroup
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// end fucntion if either of the 2 functions is done
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wg.Add(1)
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go write(*ticker, c, &wg)
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go read(c, &wg)
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wg.Wait()
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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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http.HandleFunc("/", serve)
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log.Fatal(http.ListenAndServe(*addr, nil))
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}
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