mirror of https://github.com/nealey/vail.git
86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"time"
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"golang.org/x/net/websocket"
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)
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var book Book
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type Client struct {
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repeaterName string
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}
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func (c Client) Handle(ws *websocket.Conn) {
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nowMilli := time.Now().UnixMilli()
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ws.MaxPayloadBytes = 50
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book.Join(c.repeaterName, ws)
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defer book.Part(c.repeaterName, ws)
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// Tell the client what time we think it is
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fmt.Fprintf(ws, "[%d]", time.Now().UnixNano()/time.Millisecond.Nanoseconds())
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for {
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buf := make([]byte, ws.MaxPayloadBytes)
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if n, err := ws.Read(buf); err != nil {
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break
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} else {
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buf = buf[:n]
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}
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// Decode into a Message
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var m Message
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if err := m.UnmarshalBinary(buf); err != nil {
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fmt.Fprintln(ws, err)
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ws.Close()
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return
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}
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// If it's wildly out of time, reject it
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timeDelta := (nowMilli - m.Timestamp)
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if timeDelta < 0 {
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timeDelta = -timeDelta
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}
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if timeDelta > 9999 {
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fmt.Fprintln(ws, "Bad timestamp")
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ws.Close()
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return
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}
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book.Send(c.repeaterName, m)
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}
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}
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func ChatHandler(w http.ResponseWriter, r *http.Request) {
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c := Client{
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repeaterName: r.FormValue("repeater"),
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}
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// This API is confusing as hell.
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// I suspect there's a better way to do this.
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websocket.Handler(c.Handle).ServeHTTP(w, r)
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}
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func main() {
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book = NewBook()
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http.Handle("/chat", http.HandlerFunc(ChatHandler))
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http.Handle("/", http.FileServer(http.Dir("static")))
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go book.Run()
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port := os.Getenv("PORT")
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if port == "" {
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port = "8080"
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}
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log.Println("Listening on port", port)
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err := http.ListenAndServe(":"+port, nil)
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if err != nil {
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log.Fatal(err.Error())
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}
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}
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