tests/test-stdio.py
author Raphaël Gomès <rgomes@octobus.net>
Thu, 21 Oct 2021 14:03:33 +0200
branchstable
changeset 47900 f3e218ae3fd9
parent 47505 23f5ed6dbcb1
child 48961 df56e6bd37f6
permissions -rwxr-xr-x
heptapod-ci: actually give pytest more time before timeout `HGTEST_TIMEOUT` is overridden by `HGTEST_SLOWTIMEOUT` for tests marked as slow, which `test-check-pytype.t` is. So this whole time the timeout was 1500s (or 25 minutes), which is unfortunately not long enough for a *lot* of the times it's run on the CI. Differential Revision: https://phab.mercurial-scm.org/D11717
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#!/usr/bin/env python
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"""
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Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`.
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"""
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from __future__ import absolute_import
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import contextlib
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import errno
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import os
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import signal
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import subprocess
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import sys
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import tempfile
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import unittest
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from mercurial import pycompat, util
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if pycompat.ispy3:
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    def set_noninheritable(fd):
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        # On Python 3, file descriptors are non-inheritable by default.
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        pass
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else:
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    if pycompat.iswindows:
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        # unused
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        set_noninheritable = None
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    else:
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        import fcntl
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        def set_noninheritable(fd):
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            old = fcntl.fcntl(fd, fcntl.F_GETFD)
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            fcntl.fcntl(fd, fcntl.F_SETFD, old | fcntl.FD_CLOEXEC)
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TEST_BUFFERING_CHILD_SCRIPT = r'''
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import os
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from mercurial import dispatch
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from mercurial.utils import procutil
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dispatch.initstdio()
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procutil.{stream}.write(b'aaa')
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os.write(procutil.{stream}.fileno(), b'[written aaa]')
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procutil.{stream}.write(b'bbb\n')
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os.write(procutil.{stream}.fileno(), b'[written bbb\\n]')
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'''
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UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]'
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LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]'
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FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n'
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TEST_LARGE_WRITE_CHILD_SCRIPT = r'''
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import os
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import signal
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import sys
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from mercurial import dispatch
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from mercurial.utils import procutil
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signal.signal(signal.SIGINT, lambda *x: None)
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dispatch.initstdio()
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write_result = procutil.{stream}.write(b'x' * 1048576)
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with os.fdopen(
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    os.open({write_result_fn!r}, os.O_WRONLY | getattr(os, 'O_TEMPORARY', 0)),
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    'w',
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) as write_result_f:
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    write_result_f.write(str(write_result))
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'''
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TEST_BROKEN_PIPE_CHILD_SCRIPT = r'''
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import os
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import pickle
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from mercurial import dispatch
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from mercurial.utils import procutil
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dispatch.initstdio()
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procutil.stdin.read(1)  # wait until parent process closed pipe
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try:
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    procutil.{stream}.write(b'test')
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    procutil.{stream}.flush()
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except EnvironmentError as e:
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    with os.fdopen(
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        os.open(
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            {err_fn!r},
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            os.O_WRONLY
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            | getattr(os, 'O_BINARY', 0)
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            | getattr(os, 'O_TEMPORARY', 0),
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        ),
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        'wb',
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    ) as err_f:
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        pickle.dump(e, err_f)
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# Exit early to suppress further broken pipe errors at interpreter shutdown.
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os._exit(0)
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'''
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@contextlib.contextmanager
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def _closing(fds):
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    try:
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        yield
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    finally:
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        for fd in fds:
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            try:
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                os.close(fd)
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            except EnvironmentError:
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                pass
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# In the following, we set the FDs non-inheritable mainly to make it possible
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# for tests to close the receiving end of the pipe / PTYs.
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@contextlib.contextmanager
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def _devnull():
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    devnull = os.open(os.devnull, os.O_WRONLY)
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    # We don't have a receiving end, so it's not worth the effort on Python 2
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    # on Windows to make the FD non-inheritable.
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    with _closing([devnull]):
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        yield (None, devnull)
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@contextlib.contextmanager
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def _pipes():
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    rwpair = os.pipe()
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    # Pipes are already non-inheritable on Windows.
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    if not pycompat.iswindows:
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        set_noninheritable(rwpair[0])
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        set_noninheritable(rwpair[1])
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    with _closing(rwpair):
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        yield rwpair
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@contextlib.contextmanager
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def _ptys():
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    if pycompat.iswindows:
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        raise unittest.SkipTest("PTYs are not supported on Windows")
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    import pty
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    import tty
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    rwpair = pty.openpty()
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    set_noninheritable(rwpair[0])
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    set_noninheritable(rwpair[1])
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    with _closing(rwpair):
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        tty.setraw(rwpair[0])
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        yield rwpair
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def _readall(fd, buffer_size, initial_buf=None):
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    buf = initial_buf or []
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    while True:
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        try:
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            s = os.read(fd, buffer_size)
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        except OSError as e:
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            if e.errno == errno.EIO:
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                # If the child-facing PTY got closed, reading from the
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                # parent-facing PTY raises EIO.
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                break
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            raise
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        if not s:
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            break
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        buf.append(s)
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    return b''.join(buf)
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class TestStdio(unittest.TestCase):
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    def _test(
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        self,
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        child_script,
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        stream,
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        rwpair_generator,
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        check_output,
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        python_args=[],
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        post_child_check=None,
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        stdin_generator=None,
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    ):
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        assert stream in ('stdout', 'stderr')
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        if stdin_generator is None:
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            stdin_generator = open(os.devnull, 'rb')
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        with rwpair_generator() as (
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            stream_receiver,
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            child_stream,
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        ), stdin_generator as child_stdin:
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            proc = subprocess.Popen(
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                [sys.executable] + python_args + ['-c', child_script],
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                stdin=child_stdin,
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                stdout=child_stream if stream == 'stdout' else None,
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                stderr=child_stream if stream == 'stderr' else None,
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            )
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            try:
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                os.close(child_stream)
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                if stream_receiver is not None:
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                    check_output(stream_receiver, proc)
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            except:  # re-raises
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                proc.terminate()
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                raise
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            finally:
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                retcode = proc.wait()
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            self.assertEqual(retcode, 0)
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            if post_child_check is not None:
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                post_child_check()
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    def _test_buffering(
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        self, stream, rwpair_generator, expected_output, python_args=[]
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    ):
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        def check_output(stream_receiver, proc):
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            self.assertEqual(_readall(stream_receiver, 1024), expected_output)
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        self._test(
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            TEST_BUFFERING_CHILD_SCRIPT.format(stream=stream),
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            stream,
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            rwpair_generator,
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            check_output,
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            python_args,
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        )
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    def test_buffering_stdout_devnull(self):
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        self._test_buffering('stdout', _devnull, None)
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    def test_buffering_stdout_pipes(self):
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        self._test_buffering('stdout', _pipes, FULLY_BUFFERED)
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    def test_buffering_stdout_ptys(self):
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        self._test_buffering('stdout', _ptys, LINE_BUFFERED)
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    def test_buffering_stdout_devnull_unbuffered(self):
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        self._test_buffering('stdout', _devnull, None, python_args=['-u'])
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    def test_buffering_stdout_pipes_unbuffered(self):
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        self._test_buffering('stdout', _pipes, UNBUFFERED, python_args=['-u'])
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    def test_buffering_stdout_ptys_unbuffered(self):
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        self._test_buffering('stdout', _ptys, UNBUFFERED, python_args=['-u'])
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    if not pycompat.ispy3 and not pycompat.iswindows:
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        # On Python 2 on non-Windows, we manually open stdout in line-buffered
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        # mode if connected to a TTY. We should check if Python was configured
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        # to use unbuffered stdout, but it's hard to do that.
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        test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure(
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            test_buffering_stdout_ptys_unbuffered
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        )
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    def _test_large_write(self, stream, rwpair_generator, python_args=[]):
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        if not pycompat.ispy3 and pycompat.isdarwin:
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            # Python 2 doesn't always retry on EINTR, but the libc might retry.
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            # So far, it was observed only on macOS that EINTR is raised at the
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            # Python level. As Python 2 support will be dropped soon-ish, we
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            # won't attempt to fix it.
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            raise unittest.SkipTest("raises EINTR on macOS")
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        def check_output(stream_receiver, proc):
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            if not pycompat.iswindows:
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                # On Unix, we can provoke a partial write() by interrupting it
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                # by a signal handler as soon as a bit of data was written.
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                # We test that write() is called until all data is written.
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                buf = [os.read(stream_receiver, 1)]
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                proc.send_signal(signal.SIGINT)
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            else:
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                # On Windows, there doesn't seem to be a way to cause partial
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                # writes.
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                buf = []
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            self.assertEqual(
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                _readall(stream_receiver, 131072, buf), b'x' * 1048576
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            )
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        def post_child_check():
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            write_result_str = write_result_f.read()
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            if pycompat.ispy3:
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                # On Python 3, we test that the correct number of bytes is
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                # claimed to have been written.
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                expected_write_result_str = '1048576'
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            else:
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                # On Python 2, we only check that the large write does not
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                # crash.
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                expected_write_result_str = 'None'
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            self.assertEqual(write_result_str, expected_write_result_str)
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        with tempfile.NamedTemporaryFile('r') as write_result_f:
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            self._test(
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                TEST_LARGE_WRITE_CHILD_SCRIPT.format(
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                    stream=stream, write_result_fn=write_result_f.name
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                ),
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                stream,
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                rwpair_generator,
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                check_output,
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                python_args,
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                post_child_check=post_child_check,
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            )
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    def test_large_write_stdout_devnull(self):
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        self._test_large_write('stdout', _devnull)
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    def test_large_write_stdout_pipes(self):
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        self._test_large_write('stdout', _pipes)
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    def test_large_write_stdout_ptys(self):
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        self._test_large_write('stdout', _ptys)
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    def test_large_write_stdout_devnull_unbuffered(self):
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        self._test_large_write('stdout', _devnull, python_args=['-u'])
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    def test_large_write_stdout_pipes_unbuffered(self):
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        self._test_large_write('stdout', _pipes, python_args=['-u'])
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    def test_large_write_stdout_ptys_unbuffered(self):
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        self._test_large_write('stdout', _ptys, python_args=['-u'])
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    def test_large_write_stderr_devnull(self):
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        self._test_large_write('stderr', _devnull)
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    def test_large_write_stderr_pipes(self):
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        self._test_large_write('stderr', _pipes)
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    def test_large_write_stderr_ptys(self):
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        self._test_large_write('stderr', _ptys)
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    def test_large_write_stderr_devnull_unbuffered(self):
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        self._test_large_write('stderr', _devnull, python_args=['-u'])
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    def test_large_write_stderr_pipes_unbuffered(self):
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        self._test_large_write('stderr', _pipes, python_args=['-u'])
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    def test_large_write_stderr_ptys_unbuffered(self):
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        self._test_large_write('stderr', _ptys, python_args=['-u'])
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    def _test_broken_pipe(self, stream):
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        assert stream in ('stdout', 'stderr')
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        def check_output(stream_receiver, proc):
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            os.close(stream_receiver)
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            proc.stdin.write(b'x')
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            proc.stdin.close()
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        def post_child_check():
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            err = util.pickle.load(err_f)
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            self.assertEqual(err.errno, errno.EPIPE)
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            self.assertEqual(err.strerror, "Broken pipe")
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        with tempfile.NamedTemporaryFile('rb') as err_f:
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            self._test(
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                TEST_BROKEN_PIPE_CHILD_SCRIPT.format(
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                    stream=stream, err_fn=err_f.name
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                ),
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                stream,
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                _pipes,
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                check_output,
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                post_child_check=post_child_check,
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                stdin_generator=util.nullcontextmanager(subprocess.PIPE),
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            )
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    def test_broken_pipe_stdout(self):
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        self._test_broken_pipe('stdout')
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    def test_broken_pipe_stderr(self):
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        self._test_broken_pipe('stderr')
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if __name__ == '__main__':
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    import silenttestrunner
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    silenttestrunner.main(__name__)