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websocket-server.go
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websocket-server.go
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package main
import (
"fmt"
"github.com/gorilla/websocket"
"net/http"
)
// connection is an middleman between the websocket connection and the hub.
type connection struct {
// The websocket connection.
ws *websocket.Conn
// Buffered channel of outbound messages.
send chan []byte
}
var h = hub{
broadcast: make(chan []byte),
register: make(chan *connection),
unregister: make(chan *connection),
connections: make(map[*connection]bool),
}
type hub struct {
// Registered connections.
connections map[*connection]bool
// Register requests from the connections.
register chan *connection
// Unregister requests from connections.
unregister chan *connection
// Inbound messages from the connections.
broadcast chan []byte
}
// writePump pumps messages from the hub to the websocket connection.
func (c *connection) writePump() {
for {
select {
case message := <-c.send:
if err := c.ws.WriteMessage(websocket.TextMessage, message); err != nil {
return
}
}
}
}
func (h *hub) run() {
for {
select {
case c := <-h.register:
h.connections[c] = true
fmt.Println("Register connection.")
case c := <-h.unregister:
if _, ok := h.connections[c]; ok {
delete(h.connections, c)
close(c.send)
}
case m := <-h.broadcast:
for c := range h.connections {
select {
case c.send <- m:
default:
close(c.send)
delete(h.connections, c)
}
}
}
}
}
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
func WebsocketHandler(w http.ResponseWriter, r *http.Request) {
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
fmt.Println(err)
return
}
c := &connection{send: make(chan []byte, 256), ws: ws}
fmt.Println("Websocket connection request")
h.register <- c
c.writePump()
}