tests/test-stdio.py
author Manuel Jacob <me@manueljacob.de>
Fri, 10 Jul 2020 09:59:36 +0200
changeset 45080 00cdac669614
parent 45078 a59aab6078eb
child 45095 8e04607023e5
permissions -rwxr-xr-x
procutil: split if condition This prepares the code for subsequent changes where we need to differentiate between the two cases.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 subprocess
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import sys
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import unittest
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from mercurial import pycompat
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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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@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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@contextlib.contextmanager
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def _pipes():
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    rwpair = os.pipe()
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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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    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):
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    buf = []
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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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    ):
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        assert stream in ('stdout', 'stderr')
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        with rwpair_generator() as (stream_receiver, child_stream), open(
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            os.devnull, 'rb'
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        ) 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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                check_output(stream_receiver)
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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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    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):
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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_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_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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if __name__ == '__main__':
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    import silenttestrunner
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    silenttestrunner.main(__name__)