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Initial commit – wire format implementation and some host client commands.

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Zach Klippenstein 2015-04-11 14:45:29 -07:00
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#goadb
[![GoDoc](https://godoc.org/github.com/zach-klippenstein/goadb?status.svg)](https://godoc.org/github.com/zach-klippenstein/goadb)
A Golang library for interacting with the Android Debug Bridge (adb).

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package main
import (
"fmt"
"log"
adb "github.com/zach-klippenstein/goadb"
"github.com/zach-klippenstein/goadb/wire"
)
func main() {
client := &adb.HostClient{wire.Dial}
fmt.Println("Starting server…")
client.StartServer()
serverVersion, err := client.GetServerVersion()
if err != nil {
log.Fatal(err)
}
fmt.Println("Server version:", serverVersion)
devices, err := client.ListDevices()
if err != nil {
log.Fatal(err)
}
fmt.Println("Devices:")
for _, device := range devices {
fmt.Printf("\t%+v\n", *device)
}
fmt.Println("Killing server…")
client.KillServer()
}

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package main
import (
"bufio"
"flag"
"fmt"
"io"
"log"
"os"
"strings"
"github.com/zach-klippenstein/goadb/wire"
)
var port = flag.Int("p", wire.AdbPort, "port the adb server is listening on")
func main() {
flag.Parse()
fmt.Println("using port", *port)
printServerVersion()
for {
line := readLine()
err := doCommand(line)
if err != nil {
fmt.Println("error:", err)
}
}
}
func printServerVersion() {
err := doCommand("host:version")
if err != nil {
log.Fatal(err)
}
}
func readLine() string {
fmt.Print("> ")
line, err := bufio.NewReader(os.Stdin).ReadString('\n')
if err != nil && err != io.EOF {
log.Fatal(err)
}
return strings.TrimSpace(line)
}
func doCommand(cmd string) error {
conn, err := wire.DialPort(*port)
if err != nil {
log.Fatal(err)
}
defer conn.Close()
if err := wire.SendMessageString(conn, cmd); err != nil {
return err
}
status, err := conn.ReadStatus()
if err != nil {
return err
}
var msg string
for err == nil {
msg, err = wire.ReadMessageString(conn)
if err == nil {
fmt.Printf("%s> %s\n", status, msg)
}
}
if err != io.EOF {
return err
}
return nil
}

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package goadb
import (
"bufio"
"fmt"
"strings"
)
// Device represents a connected Android device.
type Device struct {
// Always set.
Serial string
// Product, device, and model are not set in the short form.
Product string
Model string
Device string
// Only set for devices connected via USB.
Usb string
}
// IsUsb returns true if the device is connected via USB.
func (d *Device) IsUsb() bool {
return d.Usb != ""
}
func newDevice(serial string, attrs map[string]string) (*Device, error) {
if serial == "" {
return nil, fmt.Errorf("device serial cannot be blank")
}
return &Device{
Serial: serial,
Product: attrs["product"],
Model: attrs["model"],
Device: attrs["device"],
Usb: attrs["usb"],
}, nil
}
func parseDeviceList(list string, lineParseFunc func(string) (*Device, error)) ([]*Device, error) {
var devices []*Device
scanner := bufio.NewScanner(strings.NewReader(list))
for scanner.Scan() {
device, err := lineParseFunc(scanner.Text())
if err != nil {
return nil, err
}
devices = append(devices, device)
}
if err := scanner.Err(); err != nil {
return nil, err
}
return devices, nil
}
func parseDeviceShort(line string) (*Device, error) {
fields := strings.Fields(line)
if len(fields) != 2 {
return nil, fmt.Errorf("malformed device line, expected 2 fields but found %d", len(fields))
}
return newDevice(fields[0], map[string]string{})
}
func parseDeviceLong(line string) (*Device, error) {
fields := strings.Fields(line)
if len(fields) < 5 {
return nil, fmt.Errorf("malformed device line, expected at least 5 fields but found %d", len(fields))
}
attrs := parseDeviceAttributes(fields[2:])
return newDevice(fields[0], attrs)
}
func parseDeviceAttributes(fields []string) map[string]string {
attrs := map[string]string{}
for _, field := range fields {
key, val := parseKeyVal(field)
attrs[key] = val
}
return attrs
}
// Parses a key:val pair and returns key, val.
func parseKeyVal(pair string) (string, string) {
split := strings.Split(pair, ":")
return split[0], split[1]
}

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package goadb
import (
"testing"
"github.com/stretchr/testify/assert"
)
func ParseDeviceList(t *testing.T) {
devs, err := parseDeviceList(`192.168.56.101:5555 device
05856558`, parseDeviceShort)
assert.NoError(t, err)
assert.Len(t, devs, 2)
assert.Equal(t, "192.168.56.101:5555", devs[0].Serial)
assert.Equal(t, "05856558", devs[1].Serial)
}
func TestParseDeviceShort(t *testing.T) {
dev, err := parseDeviceShort("192.168.56.101:5555 device\n")
assert.NoError(t, err)
assert.Equal(t, &Device{
Serial: "192.168.56.101:5555"}, dev)
}
func TestParseDeviceLong(t *testing.T) {
dev, err := parseDeviceLong("SERIAL device product:PRODUCT model:MODEL device:DEVICE\n")
assert.NoError(t, err)
assert.Equal(t, &Device{
Serial: "SERIAL",
Product: "PRODUCT",
Model: "MODEL",
Device: "DEVICE"}, dev)
}
func TestParseDeviceLongUsb(t *testing.T) {
dev, err := parseDeviceLong("SERIAL device usb:1234 product:PRODUCT model:MODEL device:DEVICE \n")
assert.NoError(t, err)
assert.Equal(t, &Device{
Serial: "SERIAL",
Product: "PRODUCT",
Model: "MODEL",
Device: "DEVICE",
Usb: "1234"}, dev)
}

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/*
Go interface to the Android Debug Bridge (adb).
The client/server spec is defined at https://android.googlesource.com/platform/system/core/+/master/adb/OVERVIEW.TXT.
WARNING This library is under heavy development, and its API is likely to change without notice.
*/
package goadb
import (
"fmt"
"os/exec"
"strconv"
"github.com/zach-klippenstein/goadb/wire"
)
// Dialer is a function that knows how to create a connection to an adb server.
type Dialer func() (*wire.Conn, error)
/*
Interacts with host services on the adb server.
Eg.
dialer := &HostClient{wire.Dial}
dialer.GetServerVersion()
TODO make this a real example.
TODO Finish implementing services.
See list of services at https://android.googlesource.com/platform/system/core/+/master/adb/SERVICES.TXT.
*/
type HostClient struct {
Dialer
}
// GetServerVersion asks the ADB server for its internal version number.
func (c *HostClient) GetServerVersion() (int, error) {
resp, err := c.roundTripSingleResponse([]byte("host:version"))
if err != nil {
return 0, err
}
version, err := strconv.ParseInt(string(resp), 16, 32)
return int(version), err
}
/*
KillServer tells the server to quit immediately.
Corresponds to the command:
adb kill-server
*/
func (c *HostClient) KillServer() error {
conn, err := c.Dialer()
if err != nil {
return err
}
defer conn.Close()
if err = conn.SendMessage([]byte("host:kill")); err != nil {
return err
}
return nil
}
/*
StartServer ensures there is a server running.
Currently implemented by just running
adb start-server
*/
func (c *HostClient) StartServer() error {
cmd := exec.Command("adb", "start-server")
return cmd.Run()
}
/*
ListDeviceSerials returns the serial numbers of all attached devices.
Corresponds to the command:
adb devices
*/
func (c *HostClient) ListDeviceSerials() ([]string, error) {
resp, err := c.roundTripSingleResponse([]byte("host:devices"))
if err != nil {
return nil, err
}
devices, err := parseDeviceList(string(resp), parseDeviceShort)
if err != nil {
return nil, err
}
serials := make([]string, len(devices))
for i, dev := range devices {
serials[i] = dev.Serial
}
return serials, nil
}
/*
ListDevices returns the list of connected devices.
Corresponds to the command:
adb devices -l
*/
func (c *HostClient) ListDevices() ([]*Device, error) {
resp, err := c.roundTripSingleResponse([]byte("host:devices-l"))
if err != nil {
return nil, err
}
return parseDeviceList(string(resp), parseDeviceLong)
}
func (c *HostClient) roundTripSingleResponse(req []byte) (resp []byte, err error) {
conn, err := c.Dialer()
if err != nil {
return nil, err
}
defer conn.Close()
if err = conn.SendMessage(req); err != nil {
return nil, err
}
err = c.readStatusFailureAsError(conn)
if err != nil {
return nil, err
}
return conn.ReadMessage()
}
// Reads the status, and if failure, reads the message and returns it as an error.
// If the status is success, doesn't read the message.
func (c *HostClient) readStatusFailureAsError(conn *wire.Conn) error {
status, err := conn.ReadStatus()
if err != nil {
return err
}
if !status.IsSuccess() {
msg, err := conn.ReadMessage()
if err != nil {
return err
}
return fmt.Errorf("server error: %s", msg)
}
return nil
}

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package goadb
import (
"io"
"testing"
"github.com/stretchr/testify/assert"
"github.com/zach-klippenstein/goadb/wire"
)
func TestGetServerVersion(t *testing.T) {
client := &HostClient{mockDialer(&MockServer{
Status: wire.StatusSuccess,
Messages: []string{"000a"},
})}
v, err := client.GetServerVersion()
assert.NoError(t, err)
assert.Equal(t, 10, v)
}
func mockDialer(s *MockServer) Dialer {
return func() (*wire.Conn, error) {
return &wire.Conn{s, s, s}, nil
}
}
type MockServer struct {
Status wire.StatusCode
Messages []string
nextMsgIndex int
}
func (s *MockServer) ReadStatus() (wire.StatusCode, error) {
return s.Status, nil
}
func (s *MockServer) ReadMessage() ([]byte, error) {
if s.nextMsgIndex >= len(s.Messages) {
return nil, io.EOF
}
s.nextMsgIndex++
return []byte(s.Messages[s.nextMsgIndex-1]), nil
}
func (s *MockServer) SendMessage(msg []byte) error {
return nil
}
func (s *MockServer) Close() error {
return nil
}

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/*
The wire package implements the low-level part of the client/server wire protocol.
The protocol spec can be found at
https://android.googlesource.com/platform/system/core/+/master/adb/OVERVIEW.TXT.
For most cases, usage looks something like:
conn := wire.Dial()
conn.SendMessage(data)
conn.ReadStatus() == "OKAY" || "FAIL"
conn.ReadMessage()
conn.Close()
For some messages, the server will return more than one message (but still a single
status). Generally, after calling ReadStatus once, you should call ReadMessage until
it returns an io.EOF error.
For most commands, the server will close the connection after sending the response.
You should still always call Close() when you're done with the connection.
*/
package wire
import (
"fmt"
"io"
"net"
)
const (
// Default port the adb server listens on.
AdbPort = 5037
// The official implementation of adb imposes an undocumented 255-byte limit
// on messages.
MaxMessageLength = 255
)
// Conn is a connection to an adb server.
type Conn struct {
Scanner
Sender
io.Closer
}
// Dial connects to the adb server on the default port, AdbPort.
func Dial() (*Conn, error) {
return DialPort(AdbPort)
}
// Dial connects to the adb server on port.
func DialPort(port int) (*Conn, error) {
return DialAddr(fmt.Sprintf("localhost:%d", port))
}
// Dial connects to the adb server at address.
func DialAddr(address string) (*Conn, error) {
netConn, err := net.Dial("tcp", address)
if err != nil {
return nil, err
}
return &Conn{
Scanner: NewScanner(netConn),
Sender: NewSender(netConn),
Closer: netConn,
}, nil
}
var _ io.Closer = &Conn{}

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package wire
import (
"fmt"
"io"
"strconv"
)
// StatusCodes are returned by the server. If the code indicates failure, the
// next message will be the error.
type StatusCode string
const (
StatusSuccess StatusCode = "OKAY"
StatusFailure = "FAIL"
StatusNone = ""
)
func (status StatusCode) IsSuccess() bool {
return status == StatusSuccess
}
/*
Scanner reads tokens from a server.
See Conn for more details.
*/
type Scanner interface {
ReadStatus() (StatusCode, error)
ReadMessage() ([]byte, error)
}
type realScanner struct {
reader io.Reader
}
func NewScanner(r io.Reader) Scanner {
return &realScanner{r}
}
func ReadMessageString(s Scanner) (string, error) {
msg, err := s.ReadMessage()
if err != nil {
return string(msg), err
}
return string(msg), nil
}
func (s *realScanner) ReadStatus() (StatusCode, error) {
status := make([]byte, 4)
n, err := io.ReadFull(s.reader, status)
if err != nil && err != io.ErrUnexpectedEOF {
return "", err
} else if err == io.ErrUnexpectedEOF {
return StatusCode(status), incompleteMessage("status", n, 4)
}
return StatusCode(status), nil
}
func (s *realScanner) ReadMessage() ([]byte, error) {
length, err := s.readLength()
if err != nil {
return nil, err
}
data := make([]byte, length)
n, err := io.ReadFull(s.reader, data)
if err != nil && err != io.ErrUnexpectedEOF {
return data, fmt.Errorf("error reading message data: %v", err)
} else if err == io.ErrUnexpectedEOF {
return data, incompleteMessage("message data", n, length)
}
return data, nil
}
func (s *realScanner) readLength() (int, error) {
lengthHex := make([]byte, 4)
n, err := io.ReadFull(s.reader, lengthHex)
if err != nil && err != io.ErrUnexpectedEOF {
return 0, err
} else if err == io.ErrUnexpectedEOF {
return 0, incompleteMessage("length", n, 4)
}
length, err := strconv.ParseInt(string(lengthHex), 16, 64)
if err != nil {
return 0, fmt.Errorf("invalid hex length: %v", err)
}
// Clip the length to 255, as per the Google implementation.
if length > MaxMessageLength {
length = MaxMessageLength
}
return int(length), nil
}
func incompleteMessage(description string, actual int, expected int) error {
return fmt.Errorf("incomplete %s: read %d bytes, expecting %d", description, actual, expected)
}
var _ Scanner = &realScanner{}

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package wire
import (
"bufio"
"bytes"
"io"
"testing"
"github.com/stretchr/testify/assert"
)
func TestReadStatusOkay(t *testing.T) {
s := NewScannerString("OKAYd")
status, err := s.ReadStatus()
assert.NoError(t, err)
assert.True(t, status.IsSuccess())
assertNotEof(t, s)
}
func TestReadIncompleteStatus(t *testing.T) {
s := NewScannerString("oka")
_, err := s.ReadStatus()
assert.Equal(t, incompleteMessage("status", 3, 4), err)
assertEof(t, s)
}
func TestReadLength(t *testing.T) {
s := NewScannerString("000a")
l, err := s.readLength()
assert.NoError(t, err)
assert.Equal(t, 10, l)
assertEof(t, s)
}
func TestReadIncompleteLength(t *testing.T) {
s := NewScannerString("aaa")
_, err := s.readLength()
assert.Equal(t, incompleteMessage("length", 3, 4), err)
assertEof(t, s)
}
func TestReadMessage(t *testing.T) {
s := NewScannerString("0005hello")
msg, err := ReadMessageString(s)
assert.NoError(t, err)
assert.Len(t, msg, 5)
assert.Equal(t, "hello", msg)
assertEof(t, s)
}
func TestReadMessageWithExtraData(t *testing.T) {
s := NewScannerString("0005hellothere")
msg, err := ReadMessageString(s)
assert.NoError(t, err)
assert.Len(t, msg, 5)
assert.Equal(t, "hello", msg)
assertNotEof(t, s)
}
func TestReadLongerMessage(t *testing.T) {
s := NewScannerString("001b192.168.56.101:5555 device\n")
msg, err := ReadMessageString(s)
assert.NoError(t, err)
assert.Len(t, msg, 27)
assert.Equal(t, "192.168.56.101:5555 device\n", msg)
assertEof(t, s)
}
func TestReadEmptyMessage(t *testing.T) {
s := NewScannerString("0000")
msg, err := ReadMessageString(s)
assert.NoError(t, err)
assert.Equal(t, "", msg)
assertEof(t, s)
}
func TestReadIncompleteMessage(t *testing.T) {
s := NewScannerString("0005hel")
msg, err := ReadMessageString(s)
assert.Error(t, err)
assert.Equal(t, incompleteMessage("message data", 3, 5), err)
assert.Equal(t, "hel\000\000", msg)
assertEof(t, s)
}
func NewScannerString(str string) *realScanner {
return NewScanner(NewEofBuffer(str)).(*realScanner)
}
// NewEofBuffer returns a bytes.Buffer of str that returns an EOF error
// at the end of input, instead of just returning 0 bytes read.
func NewEofBuffer(str string) *bufio.Reader {
return bufio.NewReader(io.LimitReader(bytes.NewBufferString(str), int64(len(str))))
}
func assertEof(t *testing.T, s *realScanner) {
msg, err := s.ReadMessage()
assert.Equal(t, io.EOF, err)
assert.Nil(t, msg)
}
func assertNotEof(t *testing.T, s *realScanner) {
n, err := s.reader.Read(make([]byte, 1))
assert.Equal(t, 1, n)
assert.NoError(t, err)
}

45
wire/sender.go Normal file
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@ -0,0 +1,45 @@
package wire
import (
"fmt"
"io"
)
// Sender sends messages to the server.
type Sender interface {
SendMessage(msg []byte) error
}
type realSender struct {
writer io.Writer
}
func NewSender(w io.Writer) Sender {
return &realSender{w}
}
func SendMessageString(s Sender, msg string) error {
return s.SendMessage([]byte(msg))
}
func (s *realSender) SendMessage(msg []byte) error {
if len(msg) > MaxMessageLength {
return fmt.Errorf("message length exceeds maximum: %d", len(msg))
}
lengthAndMsg := fmt.Sprintf("%04x%s", len(msg), msg)
return writeFully(s.writer, []byte(lengthAndMsg))
}
func writeFully(w io.Writer, data []byte) error {
for len(data) > 0 {
n, err := w.Write(data)
if err != nil {
return err
}
data = data[n:]
}
return nil
}
var _ Sender = &realSender{}

27
wire/sender_test.go Normal file
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@ -0,0 +1,27 @@
package wire
import (
"bytes"
"testing"
"github.com/stretchr/testify/assert"
)
func TestWriteMessage(t *testing.T) {
s, b := NewTestSender()
err := SendMessageString(s, "hello")
assert.NoError(t, err)
assert.Equal(t, "0005hello", b.String())
}
func TestWriteEmptyMessage(t *testing.T) {
s, b := NewTestSender()
err := SendMessageString(s, "")
assert.NoError(t, err)
assert.Equal(t, "0000", b.String())
}
func NewTestSender() (Sender, *bytes.Buffer) {
var buf bytes.Buffer
return NewSender(&buf), &buf
}