feat: init device with optional serial, port, mjpeg port (#14)

* feat: init device with optional serial, port, mjpeg port

* fix: solve some feedbacks

device.go

@@ -6,6 +6,11 @@ import (
 	giDevice "github.com/electricbubble/gidevice"
 )
 
+const (
+	defaultPort      = 8100
+	defaultMjpegPort = 9100
+)
+
 type Device struct {
 	deviceID     int
 	serialNumber string
@@ -15,6 +20,61 @@ type Device struct {
 	d giDevice.Device
 }
 
+type DeviceOption func(d *Device)
+
+func WithSerialNumber(serialNumber string) DeviceOption {
+	return func(d *Device) {
+		d.serialNumber = serialNumber
+	}
+}
+
+func WithPort(port int) DeviceOption {
+	return func(d *Device) {
+		d.Port = port
+	}
+}
+
+func WithMjpegPort(port int) DeviceOption {
+	return func(d *Device) {
+		d.MjpegPort = port
+	}
+}
+
+func NewDevice(options ...DeviceOption) (device *Device, err error) {
+	var usbmux giDevice.Usbmux
+	if usbmux, err = giDevice.NewUsbmux(); err != nil {
+		return nil, fmt.Errorf("init usbmux failed: %v", err)
+	}
+
+	var deviceList []giDevice.Device
+	if deviceList, err = usbmux.Devices(); err != nil {
+		return nil, fmt.Errorf("get attached devices failed: %v", err)
+	}
+
+	device = &Device{
+		Port:      defaultPort,
+		MjpegPort: defaultMjpegPort,
+	}
+	for _, option := range options {
+		option(device)
+	}
+
+	serialNumber := device.serialNumber
+	for _, d := range deviceList {
+		// find device by serial number if specified
+		if serialNumber != "" && d.Properties().SerialNumber != serialNumber {
+			continue
+		}
+
+		device.deviceID = d.Properties().DeviceID
+		device.serialNumber = d.Properties().SerialNumber
+		device.d = d
+		return device, nil
+	}
+
+	return nil, fmt.Errorf("device %s not found", device.serialNumber)
+}
+
 func DeviceList() (devices []Device, err error) {
 	var usbmux giDevice.Usbmux
 	if usbmux, err = giDevice.NewUsbmux(); err != nil {
@@ -31,8 +91,8 @@ func DeviceList() (devices []Device, err error) {
 	for i := range devices {
 		devices[i].deviceID = deviceList[i].Properties().DeviceID
 		devices[i].serialNumber = deviceList[i].Properties().SerialNumber
-		devices[i].Port = 8100
-		devices[i].MjpegPort = 9100
+		devices[i].Port = defaultPort
+		devices[i].MjpegPort = defaultMjpegPort
 		devices[i].d = deviceList[i]
 	}
 

driver.go

@@ -20,7 +20,7 @@ import (
 // NewDriver creates new remote client, this will also start a new session.
 func NewDriver(capabilities Capabilities, urlPrefix string, mjpegPort ...int) (driver WebDriver, err error) {
 	if len(mjpegPort) == 0 {
-		mjpegPort = []int{9100}
+		mjpegPort = []int{defaultMjpegPort}
 	}
 	wd := new(remoteWD)
 	if wd.urlPrefix, err = url.Parse(urlPrefix); err != nil {

driver_test.go

@@ -41,6 +41,28 @@ func TestViaUSB(t *testing.T) {
 	}
 }
 
+func TestNewDevice(t *testing.T) {
+	device, _ := NewDevice()
+	if device != nil {
+		t.Log(device)
+	}
+
+	device, _ = NewDevice(WithSerialNumber("xxxx"))
+	if device != nil {
+		t.Log(device)
+	}
+
+	device, _ = NewDevice(WithPort(8700), WithMjpegPort(8800))
+	if device != nil {
+		t.Log(device)
+	}
+
+	device, _ = NewDevice(WithSerialNumber("xxxx"), WithPort(8700), WithMjpegPort(8800))
+	if device != nil {
+		t.Log(device)
+	}
+}
+
 func TestNewDriver(t *testing.T) {
 	var err error
 	driver, err = NewDriver(nil, urlPrefix)