tests/run_tool_with_logging_test.py

# Copyright 2024 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import dataclasses
from importlib import resources
import logging
import os
from pathlib import Path
import re
import signal
import stat
import subprocess
import tempfile
import textwrap
import time
import unittest
import zipfile
import sys

EXII_RETURN_CODE = 0
INTERRUPTED_RETURN_CODE = 130


class RunToolWithLoggingTest(unittest.TestCase):

  @classmethod
  def setUpClass(cls):
    super().setUpClass()
    # Configure to print logging to stdout.
    logging.basicConfig(filename=None, level=logging.DEBUG)
    console = logging.StreamHandler(sys.stdout)
    logging.getLogger('').addHandler(console)

  def setUp(self):
    super().setUp()
    self.working_dir = tempfile.TemporaryDirectory()
    # Run all the tests from working_dir which is our temp Android build top.
    os.chdir(self.working_dir.name)
    # Extract envsetup.zip which contains the envsetup.sh and other dependent
    # scripts required to set up the build environments.
    with resources.files("testdata").joinpath("envsetup.zip").open('rb') as p:
      with zipfile.ZipFile(p, "r") as zip_f:
        zip_f.extractall()

  def tearDown(self):
    self.working_dir.cleanup()
    super().tearDown()

  def test_does_not_log_when_logging_disabled(self):
    test_tool = TestScript.create(self.working_dir)
    test_logger = TestScript.create(self.working_dir)

    self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=false
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    test_tool.assert_called_once_with_args("arg1 arg2")
    test_logger.assert_not_called()

  def test_does_not_log_when_logger_var_unset(self):
    test_tool = TestScript.create(self.working_dir)
    test_logger = TestScript.create(self.working_dir)

    self._run_script_and_wait(f"""
      unset ANDROID_ENABLE_TOOL_LOGGING
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    test_tool.assert_called_once_with_args("arg1 arg2")
    test_logger.assert_not_called()

  def test_does_not_log_when_logger_var_empty(self):
    test_tool = TestScript.create(self.working_dir)

    self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER=""
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    test_tool.assert_called_once_with_args("arg1 arg2")

  def test_does_not_log_with_logger_unset(self):
    test_tool = TestScript.create(self.working_dir)

    self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      unset ANDROID_TOOL_LOGGER
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    test_tool.assert_called_once_with_args("arg1 arg2")

  def test_log_success_with_logger_enabled(self):
    test_tool = TestScript.create(self.working_dir)
    test_logger = TestScript.create(self.working_dir)

    self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    test_tool.assert_called_once_with_args("arg1 arg2")
    expected_logger_args = (
        "--tool_tag FAKE_TOOL --start_timestamp \d+\.\d+ --end_timestamp"
        ' \d+\.\d+ --tool_args "arg1 arg2" --exit_code 0'
    )
    test_logger.assert_called_once_with_args(expected_logger_args)

  def test_run_tool_output_is_same_with_and_without_logging(self):
    test_tool = TestScript.create(self.working_dir, "echo 'tool called'")
    test_logger = TestScript.create(self.working_dir)

    run_tool_with_logging_stdout, run_tool_with_logging_stderr = (
        self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)
    )

    run_tool_without_logging_stdout, run_tool_without_logging_stderr = (
        self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      {test_tool.executable} arg1 arg2
    """)
    )

    self.assertEqual(
        run_tool_with_logging_stdout, run_tool_without_logging_stdout
    )
    self.assertEqual(
        run_tool_with_logging_stderr, run_tool_without_logging_stderr
    )

  def test_logger_output_is_suppressed(self):
    test_tool = TestScript.create(self.working_dir)
    test_logger = TestScript.create(self.working_dir, "echo 'logger called'")

    run_tool_with_logging_output, _ = self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    self.assertNotIn("logger called", run_tool_with_logging_output)

  def test_logger_error_is_suppressed(self):
    test_tool = TestScript.create(self.working_dir)
    test_logger = TestScript.create(
        self.working_dir, "echo 'logger failed' > /dev/stderr; exit 1"
    )

    _, err = self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    self.assertNotIn("logger failed", err)

  def test_log_success_when_tool_interrupted(self):
    test_tool = TestScript.create(self.working_dir, script_body="sleep 100")
    test_logger = TestScript.create(self.working_dir)

    process = self._run_script_in_build_env(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    pgid = os.getpgid(process.pid)
    # Give sometime for the subprocess to start.
    time.sleep(1)
    # Kill the subprocess and any processes created in the same group.
    os.killpg(pgid, signal.SIGINT)

    returncode, _, _ = self._wait_for_process(process)
    self.assertEqual(returncode, INTERRUPTED_RETURN_CODE)

    expected_logger_args = (
        "--tool_tag FAKE_TOOL --start_timestamp \d+\.\d+ --end_timestamp"
        ' \d+\.\d+ --tool_args "arg1 arg2" --exit_code 130'
    )
    test_logger.assert_called_once_with_args(expected_logger_args)

  def test_logger_can_be_toggled_on(self):
    test_tool = TestScript.create(self.working_dir)
    test_logger = TestScript.create(self.working_dir)

    self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=false
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      ANDROID_ENABLE_TOOL_LOGGING=true
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    test_logger.assert_called_with_times(1)

  def test_logger_can_be_toggled_off(self):
    test_tool = TestScript.create(self.working_dir)
    test_logger = TestScript.create(self.working_dir)

    self._run_script_and_wait(f"""
      ANDROID_ENABLE_TOOL_LOGGING=true
      ANDROID_TOOL_LOGGER="{test_logger.executable}"
      ANDROID_ENABLE_TOOL_LOGGING=false
      run_tool_with_logging "FAKE_TOOL" {test_tool.executable} arg1 arg2
    """)

    test_logger.assert_not_called()

  def _create_build_env_script(self) -> str:
    return f"""
      source {Path(self.working_dir.name).joinpath("build/make/envsetup.sh")}
    """

  def _run_script_and_wait(self, test_script: str) -> tuple[str, str]:
    process = self._run_script_in_build_env(test_script)
    returncode, out, err = self._wait_for_process(process)
    logging.debug("script stdout: %s", out)
    logging.debug("script stderr: %s", err)
    self.assertEqual(returncode, EXII_RETURN_CODE)
    return out, err

  def _run_script_in_build_env(self, test_script: str) -> subprocess.Popen:
    setup_build_env_script = self._create_build_env_script()
    return subprocess.Popen(
        setup_build_env_script + test_script,
        shell=True,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        text=True,
        start_new_session=True,
        executable='/bin/bash'
        )

  def _wait_for_process(
      self, process: subprocess.Popen
  ) -> tuple[int, str, str]:
    pgid = os.getpgid(process.pid)
    out, err = process.communicate()
    # Wait for all process in the same group to complete since the logger runs
    # as a separate detached process.
    self._wait_for_process_group(pgid)
    return (process.returncode, out, err)

  def _wait_for_process_group(self, pgid: int, timeout: int = 5):
    """Waits for all subprocesses within the process group to complete."""
    start_time = time.time()
    while True:
      if time.time() - start_time > timeout:
        raise TimeoutError(
            f"Process group did not complete after {timeout} seconds"
        )
      for pid in os.listdir("/proc"):
        if pid.isdigit():
          try:
            if os.getpgid(int(pid)) == pgid:
              time.sleep(0.1)
              break
          except (FileNotFoundError, PermissionError, ProcessLookupError):
            pass
      else:
        # All processes have completed.
        break


@dataclasses.dataclass
class TestScript:
  executable: Path
  output_file: Path

  def create(temp_dir: Path, script_body: str = ""):
    with tempfile.NamedTemporaryFile(dir=temp_dir.name, delete=False) as f:
      output_file = f.name

    with tempfile.NamedTemporaryFile(dir=temp_dir.name, delete=False) as f:
      executable = f.name
      executable_contents = textwrap.dedent(f"""
      #!/bin/bash

      echo "${{@}}" >> {output_file}
      {script_body}
      """)
      f.write(executable_contents.encode("utf-8"))

    os.chmod(f.name, os.stat(f.name).st_mode | stat.S_IEXEC)

    return TestScript(executable, output_file)

  def assert_called_with_times(self, expected_call_times: int):
    lines = self._read_contents_from_output_file()
    assert len(lines) == expected_call_times, (
        f"Expect to call {expected_call_times} times, but actually called"
        f" {len(lines)} times."
    )

  def assert_called_with_args(self, expected_args: str):
    lines = self._read_contents_from_output_file()
    assert len(lines) > 0
    assert re.search(expected_args, lines[0]), (
        f"Expect to call with args {expected_args}, but actually called with"
        f" args {lines[0]}."
    )

  def assert_not_called(self):
    self.assert_called_with_times(0)

  def assert_called_once_with_args(self, expected_args: str):
    self.assert_called_with_times(1)
    self.assert_called_with_args(expected_args)

  def _read_contents_from_output_file(self) -> list[str]:
    with open(self.output_file, "r") as f:
      return f.readlines()


if __name__ == "__main__":
  unittest.main()