143 lines
3.3 KiB
Go
143 lines
3.3 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"io"
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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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var wsBroadcast = make(chan []byte, 100)
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const TIMEOUT = 6
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const IDLE_TIMEOUT = TIMEOUT * time.Second
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const PING_INTERVAL = (TIMEOUT - 1) * time.Second
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type WSConnection struct {
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conn *websocket.Conn
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writeLock sync.Mutex
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ReadChan chan string
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WriteChan chan string
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}
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func (ws *WSConnection) messageReader() {
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log.Printf("Reading messages")
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for {
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_, message, err := ws.conn.ReadMessage()
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ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
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if err != nil {
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return
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}
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log.Printf("Received: %s", message)
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ws.ReadChan <- string(message)
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}
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}
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func (ws *WSConnection) messageSender() {
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log.Printf("Sending messages")
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for {
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msg := <-ws.WriteChan
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ws.writeLock.Lock()
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ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
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log.Printf("Sending: %s", msg)
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err := ws.conn.WriteMessage(websocket.TextMessage, []byte(msg))
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if err != nil {
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log.Printf("Error during message writing: %v", err)
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return
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}
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ws.writeLock.Unlock()
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}
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}
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func (ws *WSConnection) pinger() {
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log.Printf("Starting pinger, sleeping for %v", PING_INTERVAL)
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for {
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time.Sleep(PING_INTERVAL)
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// log.Printf("Ping")
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ws.writeLock.Lock()
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err := ws.conn.WriteMessage(websocket.PingMessage, nil)
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if err != nil {
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log.Println("Error during ping:", err)
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return
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}
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ws.writeLock.Unlock()
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}
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}
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func (ws *WSConnection) Open() {
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log.Printf("Client connected")
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ws.ReadChan = make(chan string, 1024)
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ws.WriteChan = make(chan string, 1024)
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ws.conn.SetReadLimit(1024)
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ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
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ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
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ws.conn.SetPongHandler(func(string) error {
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// log.Println("Pong")
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ws.conn.SetReadDeadline(time.Now().Add(IDLE_TIMEOUT))
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ws.conn.SetWriteDeadline(time.Now().Add(IDLE_TIMEOUT))
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return nil
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})
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go ws.messageReader()
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go ws.messageSender()
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go ws.pinger()
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}
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func wsHandler(responseWriter http.ResponseWriter, request *http.Request) {
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conn, err := upgrader.Upgrade(responseWriter, request, nil)
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if err != nil {
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fmt.Println("Error during connection upgrade:", err)
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return
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}
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ws := new(WSConnection)
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ws.conn = conn
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ws.Open()
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}
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type DownloadReq struct {
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Link string `json:"link"`
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}
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func handleDownload(responseWriter http.ResponseWriter, request *http.Request) {
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body, err := io.ReadAll(request.Body)
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if err != nil {
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log.Printf("Error reading request body: %v", err)
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http.Error(responseWriter, "Error reading request body", http.StatusBadRequest)
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return
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}
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defer request.Body.Close()
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req := DownloadReq{}
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err = json.Unmarshal(body, &req)
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if err != nil {
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log.Printf("Error parsing JSON: %v", err)
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http.Error(responseWriter, "Error parsing JSON", http.StatusBadRequest)
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return
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}
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log.Printf("Received download request: %s", req.Link)
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wsBroadcast <- []byte(req.Link)
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}
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func main() {
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log.SetFlags(log.Lmicroseconds)
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http.HandleFunc("/ws", wsHandler)
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http.HandleFunc("/download", handleDownload)
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log.Println("Server starting on :8080")
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err := http.ListenAndServe(":8080", nil)
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if err != nil {
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log.Println("Error starting server:", err)
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}
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}
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