"""Classes to manage ADB connections.
* :py:class:`ADBPythonAsync` utilizes a Python implementation of the ADB protocol.
* :py:class:`ADBServerAsync` utilizes an ADB server to communicate with the device.
"""
import asyncio
from contextlib import asynccontextmanager
import logging
from adb_shell.adb_device_async import AdbDeviceTcpAsync
from adb_shell.auth.sign_pythonrsa import PythonRSASigner
import aiofiles
from ppadb.client import Client
from ..constants import DEFAULT_ADB_TIMEOUT_S, DEFAULT_AUTH_TIMEOUT_S, DEFAULT_LOCK_TIMEOUT_S
from ..exceptions import LockNotAcquiredException
_LOGGER = logging.getLogger(__name__)
class DeviceAsync:
"""A fake ``DeviceAsync`` class."""
def __init__(self, device):
self._device = device
async def pull(self, device_path, local_path):
"""Download a file."""
return await asyncio.get_running_loop().run_in_executor(None, self._device.pull, device_path, local_path)
async def push(self, local_path, device_path):
"""Upload a file."""
return await asyncio.get_running_loop().run_in_executor(None, self._device.push, local_path, device_path)
async def screencap(self):
"""Take a screencap."""
return await asyncio.get_running_loop().run_in_executor(None, self._device.screencap)
async def shell(self, cmd):
"""Send a shell command."""
return await asyncio.get_running_loop().run_in_executor(None, self._device.shell, cmd)
# pylint: disable=too-few-public-methods
class ClientAsync:
"""A fake ``ClientAsync`` class."""
def __init__(self, host, port):
self._client = Client(host, port)
async def device(self, serial):
"""Get a fake ``DeviceAsync`` instance."""
return DeviceAsync(await asyncio.get_running_loop().run_in_executor(None, self._client.device, serial))
@asynccontextmanager
async def _acquire(lock, timeout=DEFAULT_LOCK_TIMEOUT_S):
"""Handle acquisition and release of an ``asyncio.Lock`` object with a timeout.
Parameters
----------
lock : asyncio.Lock
The lock that we will try to acquire
timeout : float
The timeout in seconds
Yields
------
acquired : bool
Whether or not the lock was acquired
Raises
------
LockNotAcquiredException
Raised if the lock was not acquired
"""
try:
acquired = False
try:
acquired = await asyncio.wait_for(lock.acquire(), timeout)
if not acquired:
raise LockNotAcquiredException
yield acquired
except asyncio.TimeoutError:
raise LockNotAcquiredException
finally:
if acquired:
lock.release()
class ADBPythonAsync(object):
"""A manager for ADB connections that uses a Python implementation of the ADB protocol.
Parameters
----------
host : str
The address of the device; may be an IP address or a host name
port : int
The device port to which we are connecting (default is 5555)
adbkey : str
The path to the ``adbkey`` file for ADB authentication
signer : PythonRSASigner, None
The signer for the ADB keys, as loaded by :meth:`ADBPythonAsync.load_adbkey`
"""
def __init__(self, host, port, adbkey='', signer=None):
self.host = host
self.port = int(port)
self.adbkey = adbkey
self._adb = AdbDeviceTcpAsync(host=self.host, port=self.port, default_transport_timeout_s=DEFAULT_ADB_TIMEOUT_S, banner=b'androidtv')
self._signer = signer
# keep track of whether the ADB connection is intact
self._available = False
# use a lock to make sure that ADB commands don't overlap
self._adb_lock = asyncio.Lock()
@property
def available(self):
"""Check whether the ADB connection is intact.
Returns
-------
bool
Whether or not the ADB connection is intact
"""
return self._adb.available
async def close(self):
"""Close the ADB socket connection.
"""
await self._adb.close()
async def connect(self, always_log_errors=True, auth_timeout_s=DEFAULT_AUTH_TIMEOUT_S):
"""Connect to an Android TV / Fire TV device.
Parameters
----------
always_log_errors : bool
If True, errors will always be logged; otherwise, errors will only be logged on the first failed reconnect attempt
auth_timeout_s : float
Authentication timeout (in seconds)
Returns
-------
bool
Whether or not the connection was successfully established and the device is available
"""
try:
async with _acquire(self._adb_lock):
# Catch exceptions
try:
# Connect with authentication
if self.adbkey:
if not self._signer:
self._signer = await self.load_adbkey(self.adbkey)
await self._adb.connect(rsa_keys=[self._signer], auth_timeout_s=auth_timeout_s)
# Connect without authentication
else:
await self._adb.connect(auth_timeout_s=auth_timeout_s)
# ADB connection successfully established
_LOGGER.debug("ADB connection to %s:%d successfully established", self.host, self.port)
self._available = True
return True
except OSError as exc:
if self._available or always_log_errors:
if exc.strerror is None:
exc.strerror = "Timed out trying to connect to ADB device."
_LOGGER.warning("Couldn't connect to %s:%d. %s: %s", self.host, self.port, exc.__class__.__name__, exc.strerror)
# ADB connection attempt failed
await self.close()
self._available = False
return False
except Exception as exc: # pylint: disable=broad-except
if self._available or always_log_errors:
_LOGGER.warning("Couldn't connect to %s:%d. %s: %s", self.host, self.port, exc.__class__.__name__, exc)
# ADB connection attempt failed
await self.close()
self._available = False
return False
except LockNotAcquiredException:
_LOGGER.warning("Couldn't connect to %s:%d because adb-shell lock not acquired.", self.host, self.port)
await self.close()
self._available = False
return False
@staticmethod
async def load_adbkey(adbkey):
"""Load the ADB keys.
Parameters
----------
adbkey : str
The path to the ``adbkey`` file for ADB authentication
Returns
-------
PythonRSASigner
The ``PythonRSASigner`` with the key files loaded
"""
# private key
async with aiofiles.open(adbkey) as f:
priv = await f.read()
# public key
try:
async with aiofiles.open(adbkey + '.pub') as f:
pub = await f.read()
except FileNotFoundError:
pub = ''
return PythonRSASigner(pub, priv)
async def pull(self, local_path, device_path):
"""Pull a file from the device using the Python ADB implementation.
Parameters
----------
local_path : str
The path where the file will be saved
device_path : str
The file on the device that will be pulled
"""
if not self.available:
_LOGGER.debug("ADB command not sent to %s:%d because adb-shell connection is not established: pull(%s, %s)", self.host, self.port, local_path, device_path)
return
async with _acquire(self._adb_lock):
_LOGGER.debug("Sending command to %s:%d via adb-shell: pull(%s, %s)", self.host, self.port, local_path, device_path)
await self._adb.pull(device_path, local_path)
return
async def push(self, local_path, device_path):
"""Push a file to the device using the Python ADB implementation.
Parameters
----------
local_path : str
The file that will be pushed to the device
device_path : str
The path where the file will be saved on the device
"""
if not self.available:
_LOGGER.debug("ADB command not sent to %s:%d because adb-shell connection is not established: push(%s, %s)", self.host, self.port, local_path, device_path)
return
async with _acquire(self._adb_lock):
_LOGGER.debug("Sending command to %s:%d via adb-shell: push(%s, %s)", self.host, self.port, local_path, device_path)
await self._adb.push(local_path, device_path)
return
async def screencap(self):
"""Take a screenshot using the Python ADB implementation.
Returns
-------
bytes
The screencap as a binary .png image
"""
if not self.available:
_LOGGER.debug("ADB screencap not taken from %s:%d because adb-shell connection is not established", self.host, self.port)
return None
async with _acquire(self._adb_lock):
_LOGGER.debug("Taking screencap from %s:%d via adb-shell", self.host, self.port)
result = await self._adb.shell("screencap -p", decode=False)
if result[5:6] == b"\r":
return result.replace(b"\r\n", b"\n")
return result
async def shell(self, cmd):
"""Send an ADB command using the Python ADB implementation.
Parameters
----------
cmd : str
The ADB command to be sent
Returns
-------
str, None
The response from the device, if there is a response
"""
if not self.available:
_LOGGER.debug("ADB command not sent to %s:%d because adb-shell connection is not established: %s", self.host, self.port, cmd)
return None
async with _acquire(self._adb_lock):
_LOGGER.debug("Sending command to %s:%d via adb-shell: %s", self.host, self.port, cmd)
return await self._adb.shell(cmd)
class ADBServerAsync(object):
"""A manager for ADB connections that uses an ADB server.
Parameters
----------
host : str
The address of the device; may be an IP address or a host name
port : int
The device port to which we are connecting (default is 5555)
adb_server_ip : str
The IP address of the ADB server
adb_server_port : int
The port for the ADB server
"""
def __init__(self, host, port=5555, adb_server_ip='', adb_server_port=5037):
self.host = host
self.port = int(port)
self.adb_server_ip = adb_server_ip
self.adb_server_port = adb_server_port
self._adb_client = None
self._adb_device = None
# keep track of whether the ADB connection is/was intact
self._available = False
self._was_available = False
# use a lock to make sure that ADB commands don't overlap
self._adb_lock = asyncio.Lock()
@property
def available(self):
"""Check whether the ADB connection is intact.
Returns
-------
bool
Whether or not the ADB connection is intact
"""
if not self._adb_client or not self._adb_device:
return False
return self._available
async def close(self):
"""Close the ADB server socket connection.
Currently, this doesn't do anything except set ``self._available = False``.
"""
self._available = False
async def connect(self, always_log_errors=True):
"""Connect to an Android TV / Fire TV device.
Parameters
----------
always_log_errors : bool
If True, errors will always be logged; otherwise, errors will only be logged on the first failed reconnect attempt
Returns
-------
bool
Whether or not the connection was successfully established and the device is available
"""
try:
async with _acquire(self._adb_lock):
# Catch exceptions
try:
self._adb_client = ClientAsync(host=self.adb_server_ip, port=self.adb_server_port)
self._adb_device = await self._adb_client.device('{}:{}'.format(self.host, self.port))
# ADB connection successfully established
if self._adb_device:
_LOGGER.debug("ADB connection to %s:%d via ADB server %s:%d successfully established", self.host, self.port, self.adb_server_ip, self.adb_server_port)
self._available = True
self._was_available = True
return True
# ADB connection attempt failed (without an exception)
if self._was_available or always_log_errors:
_LOGGER.warning("Couldn't connect to %s:%d via ADB server %s:%d because the server is not connected to the device", self.host, self.port, self.adb_server_ip, self.adb_server_port)
await self.close()
self._available = False
self._was_available = False
return False
# ADB connection attempt failed
except Exception as exc: # noqa pylint: disable=broad-except
if self._was_available or always_log_errors:
_LOGGER.warning("Couldn't connect to %s:%d via ADB server %s:%d, error: %s", self.host, self.port, self.adb_server_ip, self.adb_server_port, exc)
await self.close()
self._available = False
self._was_available = False
return False
except LockNotAcquiredException:
_LOGGER.warning("Couldn't connect to %s:%d via ADB server %s:%d because pure-python-adb lock not acquired.", self.host, self.port, self.adb_server_ip, self.adb_server_port)
await self.close()
self._available = False
self._was_available = False
return False
async def pull(self, local_path, device_path):
"""Pull a file from the device using an ADB server.
Parameters
----------
local_path : str
The path where the file will be saved
device_path : str
The file on the device that will be pulled
"""
if not self.available:
_LOGGER.debug("ADB command not sent to %s:%d via ADB server %s:%d because pure-python-adb connection is not established: pull(%s, %s)", self.host, self.port, self.adb_server_ip, self.adb_server_port, local_path, device_path)
return
async with _acquire(self._adb_lock):
_LOGGER.debug("Sending command to %s:%d via ADB server %s:%d: pull(%s, %s)", self.host, self.port, self.adb_server_ip, self.adb_server_port, local_path, device_path)
await self._adb_device.pull(device_path, local_path)
return
async def push(self, local_path, device_path):
"""Push a file to the device using an ADB server.
Parameters
----------
local_path : str
The file that will be pushed to the device
device_path : str
The path where the file will be saved on the device
"""
if not self.available:
_LOGGER.debug("ADB command not sent to %s:%d via ADB server %s:%d because pure-python-adb connection is not established: push(%s, %s)", self.host, self.port, self.adb_server_ip, self.adb_server_port, local_path, device_path)
return
async with _acquire(self._adb_lock):
_LOGGER.debug("Sending command to %s:%d via ADB server %s:%d: push(%s, %s)", self.host, self.port, self.adb_server_ip, self.adb_server_port, local_path, device_path)
await self._adb_device.push(local_path, device_path)
return
async def screencap(self):
"""Take a screenshot using an ADB server.
Returns
-------
bytes
The screencap as a binary .png image
"""
if not self.available:
_LOGGER.debug("ADB screencap not taken from %s:%d via ADB server %s:%d because pure-python-adb connection is not established", self.host, self.port, self.adb_server_ip, self.adb_server_port)
return None
async with _acquire(self._adb_lock):
_LOGGER.debug("Taking screencap from %s:%d via ADB server %s:%d", self.host, self.port, self.adb_server_ip, self.adb_server_port)
return await self._adb_device.screencap()
async def shell(self, cmd):
"""Send an ADB command using an ADB server.
Parameters
----------
cmd : str
The ADB command to be sent
Returns
-------
str, None
The response from the device, if there is a response
"""
if not self.available:
_LOGGER.debug("ADB command not sent to %s:%d via ADB server %s:%d because pure-python-adb connection is not established: %s", self.host, self.port, self.adb_server_ip, self.adb_server_port, cmd)
return None
async with _acquire(self._adb_lock):
_LOGGER.debug("Sending command to %s:%d via ADB server %s:%d: %s", self.host, self.port, self.adb_server_ip, self.adb_server_port, cmd)
return await self._adb_device.shell(cmd)
