/
client.go
129 lines (115 loc) · 2.45 KB
/
client.go
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package main
import (
"fmt"
"log"
"net"
"net/url"
"os"
"os/signal"
"strings"
"time"
"github.com/gorilla/websocket"
"github.com/sabhiram/go-wol/wol"
)
const (
resDone = "done"
resError = "error"
)
var (
hostAddr string
secure bool
)
func client(pass string) error {
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt)
scheme := func() string {
if secure {
return "wss"
}
return "ws"
}()
u := url.URL{
Scheme: scheme,
Host: hostAddr,
Path: fmt.Sprintf("/%s/streaming", pass),
}
c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
if err != nil {
return err
}
defer c.Close()
request := make(chan []byte)
go func() {
defer close(request)
log.Println("Ready...")
for {
_, msg, err := c.ReadMessage()
if err != nil {
log.Fatal(err)
return
}
request <- msg
}
}()
for {
select {
case req := <-request:
switch {
case string(req) == cmdInfo:
log.Println("Information requested")
if err := c.WriteMessage(websocket.TextMessage, []byte("available")); err != nil {
return err
}
case strings.HasPrefix(string(req), cmdWake):
if err := func() error {
addr := strings.Split(string(req), " ")[1]
log.Printf("Waking %s\n", addr)
mp, err := wol.New(addr)
if err != nil {
return err
}
bytes, err := mp.Marshal()
if err != nil {
return err
}
bcAddr := fmt.Sprintf("%s:%s", "255.255.255.255", "9")
uAddr, err := net.ResolveUDPAddr("udp", bcAddr)
if err != nil {
return err
}
udpConn, err := net.DialUDP("udp", nil, uAddr)
if err != nil {
return err
}
defer udpConn.Close()
n, err := udpConn.Write(bytes)
if err == nil && n != 102 {
err = fmt.Errorf("magic packet sent was %d bytes (expected 102 bytes sent)", n)
}
if err != nil {
return err
}
return nil
}(); err != nil {
if err := c.WriteMessage(websocket.TextMessage, []byte(fmt.Sprintf("%s %s", resError, err.Error()))); err != nil {
return err
}
} else {
if err := c.WriteMessage(websocket.TextMessage, []byte(resDone)); err != nil {
return err
}
}
}
case <-interrupt:
err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, "interrupt"))
if err != nil {
return err
}
select {
case <-request:
case <-time.After(time.Second):
}
return nil
}
}
}