/
main.go
164 lines (146 loc) · 3.55 KB
/
main.go
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//
// Simple daemon to grab keys and then send them via websocket to the
// keysocket Chrome plugin.
//
// Written by Daniel Hobe but based off of many code examples found online.
//
// Websocket server: garyburd
// https://gist.github.com/1316852
//
// keybinding example: BurtSushi
// https://github.com/BurntSushi/xgbutil/blob/master/examples/simple-keybinding/main.go
//
// Future features:
// - config file
// - connect to Gnome setting daemon over dbus
package main
import (
"flag"
"log"
"net/http"
"time"
"code.google.com/p/go.net/websocket"
"github.com/BurntSushi/xgbutil"
"github.com/BurntSushi/xgbutil/keybind"
"github.com/BurntSushi/xgbutil/xevent"
)
type websocket_connections struct {
connections map[*connection]bool
broadcast chan string
register chan *connection
unregister chan *connection
}
var h = websocket_connections{
broadcast: make(chan string),
register: make(chan *connection),
unregister: make(chan *connection),
connections: make(map[*connection]bool),
}
func (h *websocket_connections) run() {
lastEvent := time.Now()
eventTimeout := 50 * time.Millisecond
for {
select {
case c := <-h.register:
h.connections[c] = true
case c := <-h.unregister:
delete(h.connections, c)
close(c.send)
case m := <-h.broadcast:
log.Printf("Sending %q\n", m)
execEvent := true
if time.Now().Sub(lastEvent) < eventTimeout {
execEvent = false
}
lastEvent = time.Now()
if execEvent {
for c := range h.connections {
select {
case c.send <- m:
default:
delete(h.connections, c)
close(c.send)
go c.ws.Close()
}
}
}
}
}
}
type connection struct {
// The websocket connection.
ws *websocket.Conn
// Buffered channel of outbound messages.
send chan string
}
func (c *connection) reader() {
for {
var message string
err := websocket.Message.Receive(c.ws, &message)
if err != nil {
break
}
if message == "Ping" {
err := websocket.Message.Send(c.ws, "Pong")
if err != nil {
break
}
}
}
c.ws.Close()
}
func (c *connection) writer() {
for message := range c.send {
err := websocket.Message.Send(c.ws, message)
if err != nil {
break
}
}
c.ws.Close()
}
func wsHandler(ws *websocket.Conn) {
c := &connection{send: make(chan string, 2), ws: ws}
h.register <- c
defer func() { h.unregister <- c }()
go c.writer()
c.reader()
}
func BindKeys(keymap map[string]string) {
X, err := xgbutil.NewConn()
if err != nil {
log.Fatal(err)
}
keybind.Initialize(X)
for k, v := range keymap {
v := v
err = keybind.KeyPressFun(func(X *xgbutil.XUtil, e xevent.KeyPressEvent) {
h.broadcast <- v
}).Connect(X, X.RootWin(), k, true)
if err != nil {
log.Fatal(err)
}
}
log.Println("Program initialized. Start pressing keys!")
xevent.Main(X)
}
var addr = flag.String("addr", "localhost:1337", "http service address")
var next_key = flag.String("next_key", "XF86AudioNext", "Key to skip to next track.")
var prev_key = flag.String("prev_key", "XF86AudioPrev", "Key to skip to previous track.")
var play_key = flag.String("play_key", "XF86AudioPlay", "Key to play .")
var pause_key = flag.String("pause_key", "XF86AudioPause", "Key to pause.")
func main() {
flag.Parse()
// Maybe make this flag or config file settable.
var keymap = map[string]string{
*next_key: "19", // next
*prev_key: "20", // prev
*play_key: "16", // play
*pause_key: "16", // pause
}
go h.run()
go BindKeys(keymap)
http.Handle("/", websocket.Handler(wsHandler))
if err := http.ListenAndServe(*addr, nil); err != nil {
log.Fatal("ListenAndServe:", err)
}
}