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gh-116622: Redirect stdout and stderr to system log when embedded in an Android app (#118063)
This commit is contained in:
Malcolm Smith
GitHub
parent
11f8348d78
commit
3b268f4edc
7 changed files with 511 additions and 0 deletions
332
Lib/test/test_android.py
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332
Lib/test/test_android.py
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import platform
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import queue
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import re
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import subprocess
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import sys
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import unittest
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from array import array
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from contextlib import contextmanager
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from threading import Thread
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from test.support import LOOPBACK_TIMEOUT
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from time import time
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if sys.platform != "android":
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raise unittest.SkipTest("Android-specific")
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api_level = platform.android_ver().api_level
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# Test redirection of stdout and stderr to the Android log.
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@unittest.skipIf(
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api_level < 23 and platform.machine() == "aarch64",
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"SELinux blocks reading logs on older ARM64 emulators"
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)
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class TestAndroidOutput(unittest.TestCase):
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maxDiff = None
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def setUp(self):
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self.logcat_process = subprocess.Popen(
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["logcat", "-v", "tag"], stdout=subprocess.PIPE,
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errors="backslashreplace"
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)
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self.logcat_queue = queue.Queue()
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def logcat_thread():
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for line in self.logcat_process.stdout:
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self.logcat_queue.put(line.rstrip("\n"))
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self.logcat_process.stdout.close()
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Thread(target=logcat_thread).start()
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from ctypes import CDLL, c_char_p, c_int
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android_log_write = getattr(CDLL("liblog.so"), "__android_log_write")
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android_log_write.argtypes = (c_int, c_char_p, c_char_p)
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ANDROID_LOG_INFO = 4
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# Separate tests using a marker line with a different tag.
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tag, message = "python.test", f"{self.id()} {time()}"
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android_log_write(
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ANDROID_LOG_INFO, tag.encode("UTF-8"), message.encode("UTF-8"))
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self.assert_log("I", tag, message, skip=True, timeout=5)
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def assert_logs(self, level, tag, expected, **kwargs):
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for line in expected:
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self.assert_log(level, tag, line, **kwargs)
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def assert_log(self, level, tag, expected, *, skip=False, timeout=0.5):
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deadline = time() + timeout
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while True:
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try:
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line = self.logcat_queue.get(timeout=(deadline - time()))
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except queue.Empty:
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self.fail(f"line not found: {expected!r}")
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if match := re.fullmatch(fr"(.)/{tag}: (.*)", line):
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try:
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self.assertEqual(level, match[1])
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self.assertEqual(expected, match[2])
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break
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except AssertionError:
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if not skip:
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raise
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def tearDown(self):
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self.logcat_process.terminate()
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self.logcat_process.wait(LOOPBACK_TIMEOUT)
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@contextmanager
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def unbuffered(self, stream):
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stream.reconfigure(write_through=True)
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try:
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yield
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finally:
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stream.reconfigure(write_through=False)
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def test_str(self):
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for stream_name, level in [("stdout", "I"), ("stderr", "W")]:
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with self.subTest(stream=stream_name):
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stream = getattr(sys, stream_name)
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tag = f"python.{stream_name}"
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self.assertEqual(f"<TextLogStream '{tag}'>", repr(stream))
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self.assertTrue(stream.writable())
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self.assertFalse(stream.readable())
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self.assertEqual("UTF-8", stream.encoding)
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self.assertTrue(stream.line_buffering)
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self.assertFalse(stream.write_through)
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# stderr is backslashreplace by default; stdout is configured
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# that way by libregrtest.main.
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self.assertEqual("backslashreplace", stream.errors)
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def write(s, lines=None, *, write_len=None):
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if write_len is None:
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write_len = len(s)
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self.assertEqual(write_len, stream.write(s))
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if lines is None:
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lines = [s]
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self.assert_logs(level, tag, lines)
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# Single-line messages,
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with self.unbuffered(stream):
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write("", [])
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write("a")
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write("Hello")
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write("Hello world")
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write(" ")
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write(" ")
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# Non-ASCII text
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write("ol\u00e9") # Spanish
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write("\u4e2d\u6587") # Chinese
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# Non-BMP emoji
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write("\U0001f600")
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# Non-encodable surrogates
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write("\ud800\udc00", [r"\ud800\udc00"])
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# Code used by surrogateescape (which isn't enabled here)
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write("\udc80", [r"\udc80"])
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# Null characters are logged using "modified UTF-8".
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write("\u0000", [r"\xc0\x80"])
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write("a\u0000", [r"a\xc0\x80"])
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write("\u0000b", [r"\xc0\x80b"])
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write("a\u0000b", [r"a\xc0\x80b"])
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# Multi-line messages. Avoid identical consecutive lines, as
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# they may activate "chatty" filtering and break the tests.
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write("\nx", [""])
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write("\na\n", ["x", "a"])
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write("\n", [""])
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write("b\n", ["b"])
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write("c\n\n", ["c", ""])
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write("d\ne", ["d"])
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write("xx", [])
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write("f\n\ng", ["exxf", ""])
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write("\n", ["g"])
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with self.unbuffered(stream):
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write("\nx", ["", "x"])
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write("\na\n", ["", "a"])
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write("\n", [""])
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write("b\n", ["b"])
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write("c\n\n", ["c", ""])
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write("d\ne", ["d", "e"])
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write("xx", ["xx"])
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write("f\n\ng", ["f", "", "g"])
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write("\n", [""])
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# "\r\n" should be translated into "\n".
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write("hello\r\n", ["hello"])
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write("hello\r\nworld\r\n", ["hello", "world"])
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write("\r\n", [""])
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# Non-standard line separators should be preserved.
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write("before form feed\x0cafter form feed\n",
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["before form feed\x0cafter form feed"])
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write("before line separator\u2028after line separator\n",
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["before line separator\u2028after line separator"])
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# String subclasses are accepted, but they should be converted
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# to a standard str without calling any of their methods.
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class CustomStr(str):
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def splitlines(self, *args, **kwargs):
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raise AssertionError()
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def __len__(self):
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raise AssertionError()
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def __str__(self):
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raise AssertionError()
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write(CustomStr("custom\n"), ["custom"], write_len=7)
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# Non-string classes are not accepted.
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for obj in [b"", b"hello", None, 42]:
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with self.subTest(obj=obj):
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with self.assertRaisesRegex(
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TypeError,
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fr"write\(\) argument must be str, not "
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fr"{type(obj).__name__}"
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):
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stream.write(obj)
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# Manual flushing is supported.
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write("hello", [])
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stream.flush()
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self.assert_log(level, tag, "hello")
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write("hello", [])
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write("world", [])
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stream.flush()
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self.assert_log(level, tag, "helloworld")
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# Long lines are split into blocks of 1000 characters
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# (MAX_CHARS_PER_WRITE in _android_support.py), but
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# TextIOWrapper should then join them back together as much as
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# possible without exceeding 4000 UTF-8 bytes
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# (MAX_BYTES_PER_WRITE).
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#
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# ASCII (1 byte per character)
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write(("foobar" * 700) + "\n",
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[("foobar" * 666) + "foob", # 4000 bytes
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"ar" + ("foobar" * 33)]) # 200 bytes
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# "Full-width" digits 0-9 (3 bytes per character)
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s = "\uff10\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19"
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write((s * 150) + "\n",
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[s * 100, # 3000 bytes
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s * 50]) # 1500 bytes
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s = "0123456789"
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write(s * 200, [])
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write(s * 150, [])
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write(s * 51, [s * 350]) # 3500 bytes
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write("\n", [s * 51]) # 510 bytes
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def test_bytes(self):
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for stream_name, level in [("stdout", "I"), ("stderr", "W")]:
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with self.subTest(stream=stream_name):
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stream = getattr(sys, stream_name).buffer
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tag = f"python.{stream_name}"
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self.assertEqual(f"<BinaryLogStream '{tag}'>", repr(stream))
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self.assertTrue(stream.writable())
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self.assertFalse(stream.readable())
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def write(b, lines=None, *, write_len=None):
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if write_len is None:
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write_len = len(b)
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self.assertEqual(write_len, stream.write(b))
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if lines is None:
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lines = [b.decode()]
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self.assert_logs(level, tag, lines)
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# Single-line messages,
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write(b"", [])
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write(b"a")
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write(b"Hello")
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write(b"Hello world")
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write(b" ")
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write(b" ")
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# Non-ASCII text
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write(b"ol\xc3\xa9") # Spanish
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write(b"\xe4\xb8\xad\xe6\x96\x87") # Chinese
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# Non-BMP emoji
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write(b"\xf0\x9f\x98\x80")
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# Null bytes are logged using "modified UTF-8".
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write(b"\x00", [r"\xc0\x80"])
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write(b"a\x00", [r"a\xc0\x80"])
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write(b"\x00b", [r"\xc0\x80b"])
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write(b"a\x00b", [r"a\xc0\x80b"])
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# Invalid UTF-8
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write(b"\xff", [r"\xff"])
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write(b"a\xff", [r"a\xff"])
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write(b"\xffb", [r"\xffb"])
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write(b"a\xffb", [r"a\xffb"])
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# Log entries containing newlines are shown differently by
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# `logcat -v tag`, `logcat -v long`, and Android Studio. We
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# currently use `logcat -v tag`, which shows each line as if it
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# was a separate log entry, but strips a single trailing
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# newline.
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#
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# On newer versions of Android, all three of the above tools (or
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# maybe Logcat itself) will also strip any number of leading
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# newlines.
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write(b"\nx", ["", "x"] if api_level < 30 else ["x"])
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write(b"\na\n", ["", "a"] if api_level < 30 else ["a"])
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write(b"\n", [""])
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write(b"b\n", ["b"])
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write(b"c\n\n", ["c", ""])
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write(b"d\ne", ["d", "e"])
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write(b"xx", ["xx"])
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write(b"f\n\ng", ["f", "", "g"])
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write(b"\n", [""])
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# "\r\n" should be translated into "\n".
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write(b"hello\r\n", ["hello"])
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write(b"hello\r\nworld\r\n", ["hello", "world"])
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write(b"\r\n", [""])
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# Other bytes-like objects are accepted.
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write(bytearray(b"bytearray"))
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mv = memoryview(b"memoryview")
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write(mv, ["memoryview"]) # Continuous
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write(mv[::2], ["mmrve"]) # Discontinuous
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write(
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# Android only supports little-endian architectures, so the
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# bytes representation is as follows:
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array("H", [
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0, # 00 00
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1, # 01 00
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65534, # FE FF
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65535, # FF FF
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]),
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# After encoding null bytes with modified UTF-8, the only
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# valid UTF-8 sequence is \x01. All other bytes are handled
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# by backslashreplace.
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["\\xc0\\x80\\xc0\\x80"
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"\x01\\xc0\\x80"
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"\\xfe\\xff"
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"\\xff\\xff"],
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write_len=8,
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)
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# Non-bytes-like classes are not accepted.
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for obj in ["", "hello", None, 42]:
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with self.subTest(obj=obj):
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with self.assertRaisesRegex(
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TypeError,
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fr"write\(\) argument must be bytes-like, not "
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fr"{type(obj).__name__}"
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):
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stream.write(obj)
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