cpython/Android/android.py at threading.Timer-context-manager · Ginkss/cpython · GitHub

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#!/usr/bin/env python3

import asyncio

import argparse

from glob import glob

import os

import re

import shlex

import shutil

import signal

import subprocess

import sys

import sysconfig

from asyncio import wait_for

from contextlib import asynccontextmanager

from os.path import basename, relpath

from pathlib import Path

from subprocess import CalledProcessError

from tempfile import TemporaryDirectory

SCRIPT_NAME = Path(__file__).name

CHECKOUT = Path(__file__).resolve().parent.parent

ANDROID_DIR = CHECKOUT / "Android"

TESTBED_DIR = ANDROID_DIR / "testbed"

CROSS_BUILD_DIR = CHECKOUT / "cross-build"

APP_ID = "org.python.testbed"

DECODE_ARGS = ("UTF-8", "backslashreplace")

try:

android_home = Path(os.environ['ANDROID_HOME'])

except KeyError:

sys.exit("The ANDROID_HOME environment variable is required.")

adb = Path(

f"{android_home}/platform-tools/adb"

+ (".exe" if os.name == "nt" else "")

)

gradlew = Path(

f"{TESTBED_DIR}/gradlew"

+ (".bat" if os.name == "nt" else "")

)

logcat_started = False

def delete_glob(pattern):

# Path.glob doesn't accept non-relative patterns.

for path in glob(str(pattern)):

path = Path(path)

print(f"Deleting {path} ...")

if path.is_dir() and not path.is_symlink():

shutil.rmtree(path)

else:

path.unlink()

def subdir(name, *, clean=None):

path = CROSS_BUILD_DIR / name

if clean:

delete_glob(path)

if not path.exists():

if clean is None:

sys.exit(

f"{path} does not exist. Create it by running the appropriate "

f"`configure` subcommand of {SCRIPT_NAME}.")

else:

path.mkdir(parents=True)

return path

def run(command, *, host=None, env=None, log=True, **kwargs):

kwargs.setdefault("check", True)

if env is None:

env = os.environ.copy()

original_env = env.copy()

if host:

env_script = ANDROID_DIR / "android-env.sh"

env_output = subprocess.run(

f"set -eu; "

f"HOST={host}; "

f"PREFIX={subdir(host)}/prefix; "

f". {env_script}; "

f"export",

check=True, shell=True, text=True, stdout=subprocess.PIPE

).stdout

for line in env_output.splitlines():

# We don't require every line to match, as there may be some other

# output from installing the NDK.

if match := re.search(

"^(declare -x |export )?(\\w+)=['\"]?(.*?)['\"]?$", line

key, value = match[2], match[3]

if env.get(key) != value:

print(line)

env[key] = value

if env == original_env:

raise ValueError(f"Found no variables in {env_script.name} output:\n"

+ env_output)

if log:

print(">", " ".join(map(str, command)))

return subprocess.run(command, env=env, **kwargs)

def build_python_path():

"""The path to the build Python binary."""

build_dir = subdir("build")

binary = build_dir / "python"

if not binary.is_file():

binary = binary.with_suffix(".exe")

if not binary.is_file():

raise FileNotFoundError("Unable to find `python(.exe)` in "

f"{build_dir}")

return binary

def configure_build_python(context):

os.chdir(subdir("build", clean=context.clean))

command = [relpath(CHECKOUT / "configure")]

if context.args:

command.extend(context.args)

run(command)

def make_build_python(context):

os.chdir(subdir("build"))

run(["make", "-j", str(os.cpu_count())])

def unpack_deps(host):

deps_url = "https://github.com/beeware/cpython-android-source-deps/releases/download"

for name_ver in ["bzip2-1.0.8-1", "libffi-3.4.4-2", "openssl-3.0.15-0",

"sqlite-3.45.1-0", "xz-5.4.6-0"]:

filename = f"{name_ver}-{host}.tar.gz"

download(f"{deps_url}/{name_ver}/{filename}")

run(["tar", "-xf", filename])

os.remove(filename)

def download(url, target_dir="."):

out_path = f"{target_dir}/{basename(url)}"

run(["curl", "-Lf", "-o", out_path, url])

return out_path

def configure_host_python(context):

host_dir = subdir(context.host, clean=context.clean)

prefix_dir = host_dir / "prefix"

if not prefix_dir.exists():

prefix_dir.mkdir()

os.chdir(prefix_dir)

unpack_deps(context.host)

build_dir = host_dir / "build"

build_dir.mkdir(exist_ok=True)

os.chdir(build_dir)

command = [

# Basic cross-compiling configuration

relpath(CHECKOUT / "configure"),

f"--host={context.host}",

f"--build={sysconfig.get_config_var('BUILD_GNU_TYPE')}",

f"--with-build-python={build_python_path()}",

"--without-ensurepip",

# Android always uses a shared libpython.

"--enable-shared",

"--without-static-libpython",

# Dependent libraries. The others are found using pkg-config: see

# android-env.sh.

f"--with-openssl={prefix_dir}",

]

if context.args:

command.extend(context.args)

run(command, host=context.host)

def make_host_python(context):

# The CFLAGS and LDFLAGS set in android-env include the prefix dir, so

# delete any previously-installed Python libs and include files to prevent

# them being used during the build.

host_dir = subdir(context.host)

prefix_dir = host_dir / "prefix"

delete_glob(f"{prefix_dir}/include/python*")

delete_glob(f"{prefix_dir}/lib/libpython*")

os.chdir(host_dir / "build")

run(["make", "-j", str(os.cpu_count())], host=context.host)

run(["make", "install", f"prefix={prefix_dir}"], host=context.host)

def build_all(context):

steps = [configure_build_python, make_build_python, configure_host_python,

make_host_python]

for step in steps:

step(context)

def clean_all(context):

delete_glob(CROSS_BUILD_DIR)

def setup_sdk():

sdkmanager = android_home / (

"cmdline-tools/latest/bin/sdkmanager"

+ (".bat" if os.name == "nt" else "")

)

# Gradle will fail if it needs to install an SDK package whose license

# hasn't been accepted, so pre-accept all licenses.

if not all((android_home / "licenses" / path).exists() for path in [

"android-sdk-arm-dbt-license", "android-sdk-license"

]):

run([sdkmanager, "--licenses"], text=True, input="y\n" * 100)

# Gradle may install this automatically, but we can't rely on that because

# we need to run adb within the logcat task.

if not adb.exists():

run([sdkmanager, "platform-tools"])

# To avoid distributing compiled artifacts without corresponding source code,

# the Gradle wrapper is not included in the CPython repository. Instead, we

# extract it from the Gradle release.

def setup_testbed():

if all((TESTBED_DIR / path).exists() for path in [

"gradlew", "gradlew.bat", "gradle/wrapper/gradle-wrapper.jar",

]):

return

ver_long = "8.7.0"

ver_short = ver_long.removesuffix(".0")

for filename in ["gradlew", "gradlew.bat"]:

out_path = download(

f"https://raw.githubusercontent.com/gradle/gradle/v{ver_long}/{filename}",

TESTBED_DIR)

os.chmod(out_path, 0o755)

with TemporaryDirectory(prefix=SCRIPT_NAME) as temp_dir:

bin_zip = download(

f"https://services.gradle.org/distributions/gradle-{ver_short}-bin.zip",

temp_dir)

outer_jar = f"gradle-{ver_short}/lib/plugins/gradle-wrapper-{ver_short}.jar"

run(["unzip", "-d", temp_dir, bin_zip, outer_jar])

run(["unzip", "-o", "-d", f"{TESTBED_DIR}/gradle/wrapper",

f"{temp_dir}/{outer_jar}", "gradle-wrapper.jar"])

# run_testbed will build the app automatically, but it's useful to have this as

# a separate command to allow running the app outside of this script.

def build_testbed(context):

setup_sdk()

setup_testbed()

run(

[gradlew, "--console", "plain", "packageDebug", "packageDebugAndroidTest"],

cwd=TESTBED_DIR,

)

# Work around a bug involving sys.exit and TaskGroups

# (https://github.com/python/cpython/issues/101515).

def exit(*args):

raise MySystemExit(*args)

class MySystemExit(Exception):

pass

# The `test` subcommand runs all subprocesses through this context manager so

# that no matter what happens, they can always be cancelled from another task,

# and they will always be cleaned up on exit.

@asynccontextmanager

async def async_process(*args, **kwargs):

process = await asyncio.create_subprocess_exec(*args, **kwargs)

try:

yield process

finally:

if process.returncode is None:

# Allow a reasonably long time for Gradle to clean itself up,

# because we don't want stale emulators left behind.

timeout = 10

process.terminate()

try:

await wait_for(process.wait(), timeout)

except TimeoutError:

print(

f"Command {args} did not terminate after {timeout} seconds "

f" - sending SIGKILL"

)

process.kill()

# Even after killing the process we must still wait for it,

# otherwise we'll get the warning "Exception ignored in __del__".

await wait_for(process.wait(), timeout=1)

async def async_check_output(*args, **kwargs):

async with async_process(

*args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, **kwargs

) as process:

stdout, stderr = await process.communicate()

if process.returncode == 0:

return stdout.decode(*DECODE_ARGS)

else:

raise CalledProcessError(

process.returncode, args,

stdout.decode(*DECODE_ARGS), stderr.decode(*DECODE_ARGS)

)

# Return a list of the serial numbers of connected devices. Emulators will have

# serials of the form "emulator-5678".

async def list_devices():

serials = []

header_found = False

lines = (await async_check_output(adb, "devices")).splitlines()

for line in lines:

# Ignore blank lines, and all lines before the header.

line = line.strip()

if line == "List of devices attached":

header_found = True

elif header_found and line:

try:

serial, status = line.split()

except ValueError:

raise ValueError(f"failed to parse {line!r}")

if status == "device":

serials.append(serial)

if not header_found:

raise ValueError(f"failed to parse {lines}")

return serials

async def find_device(context, initial_devices):

if context.managed:

print("Waiting for managed device - this may take several minutes")

while True:

new_devices = set(await list_devices()).difference(initial_devices)

if len(new_devices) == 0:

await asyncio.sleep(1)

elif len(new_devices) == 1:

serial = new_devices.pop()

print(f"Serial: {serial}")

return serial

else:

exit(f"Found more than one new device: {new_devices}")

else:

return context.connected

# An older version of this script in #121595 filtered the logs by UID instead.

# But logcat can't filter by UID until API level 31. If we ever switch back to

# filtering by UID, we'll also have to filter by time so we only show messages

# produced after the initial call to `stop_app`.

# We're more likely to miss the PID because it's shorter-lived, so there's a

# workaround in PythonSuite.kt to stop it being *too* short-lived.

async def find_pid(serial):

print("Waiting for app to start - this may take several minutes")

shown_error = False

while True:

try:

# `pidof` requires API level 24 or higher. The level 23 emulator

# includes it, but it doesn't work (it returns all processes).

pid = (await async_check_output(

adb, "-s", serial, "shell", "pidof", "-s", APP_ID

)).strip()

except CalledProcessError as e:

# If the app isn't running yet, pidof gives no output. So if there

# is output, there must have been some other error. However, this

# sometimes happens transiently, especially when running a managed

# emulator for the first time, so don't make it fatal.

if (e.stdout or e.stderr) and not shown_error:

print_called_process_error(e)

print("This may be transient, so continuing to wait")

shown_error = True

else:

# Some older devices (e.g. Nexus 4) return zero even when no process

# was found, so check whether we actually got any output.

if pid:

print(f"PID: {pid}")

return pid

# Loop fairly rapidly to avoid missing a short-lived process.

await asyncio.sleep(0.2)

async def logcat_task(context, initial_devices):

# Gradle may need to do some large downloads of libraries and emulator

# images. This will happen during find_device in --managed mode, or find_pid

# in --connected mode.

startup_timeout = 600

serial = await wait_for(find_device(context, initial_devices), startup_timeout)

pid = await wait_for(find_pid(serial), startup_timeout)

# `--pid` requires API level 24 or higher.

args = [adb, "-s", serial, "logcat", "--pid", pid, "--format", "tag"]

hidden_output = []

async with async_process(

*args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,

) as process:

while line := (await process.stdout.readline()).decode(*DECODE_ARGS):

if match := re.fullmatch(r"([A-Z])/(.*)", line, re.DOTALL):

level, message = match.groups()

else:

# If the regex doesn't match, this is probably the second or

# subsequent line of a multi-line message. Python won't produce

# such messages, but other components might.

level, message = None, line

# Exclude high-volume messages which are rarely useful.

if context.verbose < 2 and "from python test_syslog" in message:

continue

# Put high-level messages on stderr so they're highlighted in the

# buildbot logs. This will include Python's own stderr.

stream = (

sys.stderr

if level in ["W", "E", "F"] # WARNING, ERROR, FATAL (aka ASSERT)

else sys.stdout

)

# To simplify automated processing of the output, e.g. a buildbot

# posting a failure notice on a GitHub PR, we strip the level and

# tag indicators from Python's stdout and stderr.

for prefix in ["python.stdout: ", "python.stderr: "]:

if message.startswith(prefix):

global logcat_started

logcat_started = True

stream.write(message.removeprefix(prefix))

break

else:

if context.verbose:

# Non-Python messages add a lot of noise, but they may

# sometimes help explain a failure.

stream.write(line)

else:

hidden_output.append(line)

# If the device disconnects while logcat is running, which always

# happens in --managed mode, some versions of adb return non-zero.

# Distinguish this from a logcat startup error by checking whether we've

# received a message from Python yet.

status = await wait_for(process.wait(), timeout=1)

if status != 0 and not logcat_started:

raise CalledProcessError(status, args, "".join(hidden_output))

def stop_app(serial):

run([adb, "-s", serial, "shell", "am", "force-stop", APP_ID], log=False)

async def gradle_task(context):

env = os.environ.copy()

if context.managed:

task_prefix = context.managed

else:

task_prefix = "connected"

env["ANDROID_SERIAL"] = context.connected

args = [

gradlew, "--console", "plain", f"{task_prefix}DebugAndroidTest",

"-Pandroid.testInstrumentationRunnerArguments.pythonArgs="

+ shlex.join(context.args),

]

hidden_output = []

try:

async with async_process(

*args, cwd=TESTBED_DIR, env=env,

stdout=subprocess.PIPE, stderr=subprocess.STDOUT,

) as process:

while line := (await process.stdout.readline()).decode(*DECODE_ARGS):

# Gradle may take several minutes to install SDK packages, so

# it's worth showing those messages even in non-verbose mode.

if context.verbose or line.startswith('Preparing "Install'):

sys.stdout.write(line)

else:

hidden_output.append(line)

status = await wait_for(process.wait(), timeout=1)

if status == 0:

exit(0)

else:

raise CalledProcessError(status, args)

finally:

# If logcat never started, then something has gone badly wrong, so the

# user probably wants to see the Gradle output even in non-verbose mode.

if hidden_output and not logcat_started:

sys.stdout.write("".join(hidden_output))

# Gradle does not stop the tests when interrupted.

if context.connected:

stop_app(context.connected)

async def run_testbed(context):

setup_sdk()

setup_testbed()

if context.managed:

# In this mode, Gradle will create a device with an unpredictable name.

# So we save a list of the running devices before starting Gradle, and

# find_device then waits for a new device to appear.

initial_devices = await list_devices()

else:

# In case the previous shutdown was unclean, make sure the app isn't

# running, otherwise we might show logs from a previous run. This is

# unnecessary in --managed mode, because Gradle creates a new emulator

# every time.

stop_app(context.connected)

initial_devices = None

try:

async with asyncio.TaskGroup() as tg:

tg.create_task(logcat_task(context, initial_devices))

tg.create_task(gradle_task(context))

except* MySystemExit as e:

raise SystemExit(*e.exceptions[0].args) from None

except* CalledProcessError as e:

# Extract it from the ExceptionGroup so it can be handled by `main`.

raise e.exceptions[0]

# Handle SIGTERM the same way as SIGINT. This ensures that if we're terminated

# by the buildbot worker, we'll make an attempt to clean up our subprocesses.

def install_signal_handler():

def signal_handler(*args):

os.kill(os.getpid(), signal.SIGINT)

signal.signal(signal.SIGTERM, signal_handler)

def parse_args():

parser = argparse.ArgumentParser()

subcommands = parser.add_subparsers(dest="subcommand")

build = subcommands.add_parser("build", help="Build everything")

configure_build = subcommands.add_parser("configure-build",

help="Run `configure` for the "

"build Python")

make_build = subcommands.add_parser("make-build",

help="Run `make` for the build Python")

configure_host = subcommands.add_parser("configure-host",

help="Run `configure` for Android")

make_host = subcommands.add_parser("make-host",

help="Run `make` for Android")

subcommands.add_parser(

"clean", help="Delete the cross-build directory")

for subcommand in build, configure_build, configure_host:

subcommand.add_argument(

"--clean", action="store_true", default=False, dest="clean",

help="Delete any relevant directories before building")

for subcommand in build, configure_host, make_host:

subcommand.add_argument(

"host", metavar="HOST",

choices=["aarch64-linux-android", "x86_64-linux-android"],

help="Host triplet: choices=[%(choices)s]")

for subcommand in build, configure_build, configure_host:

subcommand.add_argument("args", nargs="*",

help="Extra arguments to pass to `configure`")

subcommands.add_parser(

"build-testbed", help="Build the testbed app")

test = subcommands.add_parser(

"test", help="Run the test suite")

test.add_argument(

"-v", "--verbose", action="count", default=0,

help="Show Gradle output, and non-Python logcat messages. "

"Use twice to include high-volume messages which are rarely useful.")

device_group = test.add_mutually_exclusive_group(required=True)

device_group.add_argument(

"--connected", metavar="SERIAL", help="Run on a connected device. "

"Connect it yourself, then get its serial from `adb devices`.")

device_group.add_argument(

"--managed", metavar="NAME", help="Run on a Gradle-managed device. "

"These are defined in `managedDevices` in testbed/app/build.gradle.kts.")

test.add_argument(

"args", nargs="*", help=f"Arguments for `python -m test`. "

f"Separate them from {SCRIPT_NAME}'s own arguments with `--`.")

return parser.parse_args()

def main():

install_signal_handler()

# Under the buildbot, stdout is not a TTY, but we must still flush after

# every line to make sure our output appears in the correct order relative

# to the output of our subprocesses.

for stream in [sys.stdout, sys.stderr]:

stream.reconfigure(line_buffering=True)

context = parse_args()

dispatch = {"configure-build": configure_build_python,

"make-build": make_build_python,

"configure-host": configure_host_python,

"make-host": make_host_python,

"build": build_all,

"clean": clean_all,

"build-testbed": build_testbed,

"test": run_testbed}

try:

result = dispatch[context.subcommand](context)

if asyncio.iscoroutine(result):

asyncio.run(result)

except CalledProcessError as e:

print_called_process_error(e)

sys.exit(1)

def print_called_process_error(e):

for stream_name in ["stdout", "stderr"]:

content = getattr(e, stream_name)

stream = getattr(sys, stream_name)

if content:

stream.write(content)

if not content.endswith("\n"):

stream.write("\n")

# Format the command so it can be copied into a shell. shlex uses single

# quotes, so we surround the whole command with double quotes.

args_joined = (

e.cmd if isinstance(e.cmd, str)

else " ".join(shlex.quote(str(arg)) for arg in e.cmd)

)

print(

f'Command "{args_joined}" returned exit status {e.returncode}'

)

if __name__ == "__main__":

main()

cpython/Android/android.py at threading.Timer-context-manager · Ginkss/cpython · GitHub

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