func deviceLoop(dev *device.Device) {
// first check that it's enabled
if !dev.Info.VNC.Enabled {
dev.Warn("Attempted to start VNC loop, but VNC is disabled")
return
}
// check that there's a password
if len(dev.Info.VNC.Password) == 0 {
dev.Warn("Attempted to start VNC loop, but there's no password")
return
}
// create a passwd file
passwd := dev.GetFilePath("vncpasswd")
C.vncEncryptAndStorePasswd(C.CString(dev.Info.VNC.Password), C.CString(passwd))
tryLater := func(errStr string) {
dev.Warn(errStr + "; waiting 10 seconds")
time.Sleep(10 * time.Second)
}
// this method will loop so long as the device is
// configured to run VNC.
dev.Debug("starting VNC loop")
VNCLoop:
for dev.Info.VNC.Enabled {
// not online
if !dev.Online {
time.Sleep(10 * time.Second)
continue VNCLoop
}
cmd := exec.Command("vncsnapshot",
"-passwd", passwd,
"-fps", "5",
// "-encodings", "raw",
"-count", "50",
dev.Info.AddrString,
dev.GetFilePath("screenshots/screenshot.jpg"),
)
// get STDERR and make a scanner
stderr, err := cmd.StderrPipe()
if err != nil {
tryLater("failed to get vncsnapshot STDERR pipe")
continue VNCLoop
}
scanner := bufio.NewScanner(stderr)
// start the command
if err := cmd.Start(); err != nil {
tryLater("vncsnapshot failed to start")
continue VNCLoop
}
// read from the scanner
for scanner.Scan() {
handleVNCSnapshotOutput(dev, scanner.Text())
}
// scanner error
if err := scanner.Err(); err != nil {
tryLater("Scanner terminated with error: " + err.Error())
continue VNCLoop
}
// vncsnapshot exited with non-zero status
if err := cmd.Wait(); err != nil {
tryLater("vncsnapshot exited: " + err.Error())
continue VNCLoop
}
}
}
