512 lines
17 KiB
Python
512 lines
17 KiB
Python
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
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# Copyright 2015-2018 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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"""Base class for a subprocess run for tests."""
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import re
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import os
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import time
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import attr
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import pytest
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import pytestqt.plugin
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from PyQt5.QtCore import (pyqtSlot, pyqtSignal, QProcess, QObject,
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QElapsedTimer, QProcessEnvironment)
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from PyQt5.QtTest import QSignalSpy
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from helpers import utils
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from qutebrowser.utils import utils as quteutils
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class InvalidLine(Exception):
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"""Raised when the process prints a line which is not parsable."""
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pass
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class ProcessExited(Exception):
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"""Raised when the child process did exit."""
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pass
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class WaitForTimeout(Exception):
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"""Raised when wait_for didn't get the expected message."""
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class BlacklistedMessageError(Exception):
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"""Raised when ensure_not_logged found a message."""
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@attr.s
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class Line:
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"""Container for a line of data the process emits.
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Attributes:
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data: The raw data passed to the constructor.
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waited_for: If Process.wait_for was used on this line already.
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"""
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data = attr.ib()
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waited_for = attr.ib(False)
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def _render_log(data, *, verbose, threshold=100):
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"""Shorten the given log without -v and convert to a string."""
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data = [str(d) for d in data]
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is_exception = any('Traceback (most recent call last):' in line or
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'Uncaught exception' in line for line in data)
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if len(data) > threshold and not verbose and not is_exception:
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msg = '[{} lines suppressed, use -v to show]'.format(
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len(data) - threshold)
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data = [msg] + data[-threshold:]
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return '\n'.join(data)
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@pytest.hookimpl(hookwrapper=True)
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def pytest_runtest_makereport(item, call):
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"""Add qutebrowser/server sections to captured output if a test failed."""
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outcome = yield
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if call.when not in ['call', 'teardown']:
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return
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report = outcome.get_result()
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if report.passed:
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return
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quteproc_log = getattr(item, '_quteproc_log', None)
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server_log = getattr(item, '_server_log', None)
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if not hasattr(report.longrepr, 'addsection'):
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# In some conditions (on macOS and Windows it seems), report.longrepr
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# is actually a tuple. This is handled similarly in pytest-qt too.
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return
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if item.config.getoption('--capture') == 'no':
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# Already printed live
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return
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verbose = item.config.getoption('--verbose')
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if quteproc_log is not None:
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report.longrepr.addsection("qutebrowser output",
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_render_log(quteproc_log, verbose=verbose))
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if server_log is not None:
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report.longrepr.addsection("server output",
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_render_log(server_log, verbose=verbose))
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class Process(QObject):
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"""Abstraction over a running test subprocess process.
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Reads the log from its stdout and parses it.
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Attributes:
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_invalid: A list of lines which could not be parsed.
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_data: A list of parsed lines.
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_started: Whether the process was ever started.
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proc: The QProcess for the underlying process.
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exit_expected: Whether the process is expected to quit.
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request: The request object for the current test.
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Signals:
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ready: Emitted when the server finished starting up.
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new_data: Emitted when a new line was parsed.
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"""
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ready = pyqtSignal()
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new_data = pyqtSignal(object)
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KEYS = ['data']
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def __init__(self, request, parent=None):
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super().__init__(parent)
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self.request = request
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self.captured_log = []
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self._started = False
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self._invalid = []
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self._data = []
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self.proc = QProcess()
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self.proc.setReadChannel(QProcess.StandardError)
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self.exit_expected = None # Not started at all yet
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def _log(self, line):
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"""Add the given line to the captured log output."""
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if self.request.config.getoption('--capture') == 'no':
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print(line)
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self.captured_log.append(line)
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def log_summary(self, text):
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"""Log the given line as summary/title."""
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text = '\n{line} {text} {line}\n'.format(line='='*30, text=text)
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self._log(text)
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def _parse_line(self, line):
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"""Parse the given line from the log.
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Return:
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A self.ParseResult member.
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"""
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raise NotImplementedError
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def _executable_args(self):
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"""Get the executable and necessary arguments as a tuple."""
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raise NotImplementedError
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def _default_args(self):
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"""Get the default arguments to use if none were passed to start()."""
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raise NotImplementedError
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def _get_data(self):
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"""Get the parsed data for this test.
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Also waits for 0.5s to make sure any new data is received.
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Subprocesses are expected to alias this to a public method with a
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better name.
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"""
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self.proc.waitForReadyRead(500)
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self.read_log()
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return self._data
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def _wait_signal(self, signal, timeout=5000, raising=True):
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"""Wait for a signal to be emitted.
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Should be used in a contextmanager.
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"""
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blocker = pytestqt.plugin.SignalBlocker(timeout=timeout,
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raising=raising)
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blocker.connect(signal)
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return blocker
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@pyqtSlot()
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def read_log(self):
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"""Read the log from the process' stdout."""
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if not hasattr(self, 'proc'):
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# I have no idea how this happens, but it does...
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return
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while self.proc.canReadLine():
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line = self.proc.readLine()
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line = bytes(line).decode('utf-8', errors='ignore').rstrip('\r\n')
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try:
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parsed = self._parse_line(line)
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except InvalidLine:
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self._invalid.append(line)
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self._log("INVALID: {}".format(line))
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continue
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if parsed is None:
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if self._invalid:
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self._log("IGNORED: {}".format(line))
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else:
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self._data.append(parsed)
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self.new_data.emit(parsed)
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def start(self, args=None, *, env=None):
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"""Start the process and wait until it started."""
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self._start(args, env=env)
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self._started = True
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verbose = self.request.config.getoption('--verbose')
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timeout = 60 if 'CI' in os.environ else 20
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for _ in range(timeout):
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with self._wait_signal(self.ready, timeout=1000,
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raising=False) as blocker:
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pass
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if not self.is_running():
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if self.exit_expected:
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return
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# _start ensures it actually started, but it might quit shortly
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# afterwards
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raise ProcessExited('\n' + _render_log(self.captured_log,
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verbose=verbose))
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if blocker.signal_triggered:
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self._after_start()
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return
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raise WaitForTimeout("Timed out while waiting for process start.\n" +
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_render_log(self.captured_log, verbose=verbose))
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def _start(self, args, env):
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"""Actually start the process."""
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executable, exec_args = self._executable_args()
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if args is None:
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args = self._default_args()
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procenv = QProcessEnvironment.systemEnvironment()
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if env is not None:
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for k, v in env.items():
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procenv.insert(k, v)
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self.proc.readyRead.connect(self.read_log)
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self.proc.setProcessEnvironment(procenv)
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self.proc.start(executable, exec_args + args)
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ok = self.proc.waitForStarted()
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assert ok
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assert self.is_running()
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def _after_start(self):
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"""Do things which should be done immediately after starting."""
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pass
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def before_test(self):
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"""Restart process before a test if it exited before."""
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self._invalid = []
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if not self.is_running():
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self.start()
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def after_test(self):
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"""Clean up data after each test.
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Also checks self._invalid so the test counts as failed if there were
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unexpected output lines earlier.
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"""
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__tracebackhide__ = lambda e: e.errisinstance(ProcessExited)
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self.captured_log = []
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if self._invalid:
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# Wait for a bit so the full error has a chance to arrive
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time.sleep(1)
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# Exit the process to make sure we're in a defined state again
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self.terminate()
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self.clear_data()
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raise InvalidLine('\n' + '\n'.join(self._invalid))
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self.clear_data()
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if not self.is_running() and not self.exit_expected and self._started:
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raise ProcessExited
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self.exit_expected = False
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def clear_data(self):
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"""Clear the collected data."""
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self._data.clear()
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def terminate(self):
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"""Clean up and shut down the process."""
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if not self.is_running():
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return
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if quteutils.is_windows:
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self.proc.kill()
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else:
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self.proc.terminate()
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ok = self.proc.waitForFinished()
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assert ok
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def is_running(self):
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"""Check if the process is currently running."""
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return self.proc.state() == QProcess.Running
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def _match_data(self, value, expected):
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"""Helper for wait_for to match a given value.
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The behavior of this method is slightly different depending on the
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types of the filtered values:
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- If expected is None, the filter always matches.
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- If the value is a string or bytes object and the expected value is
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too, the pattern is treated as a glob pattern (with only * active).
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- If the value is a string or bytes object and the expected value is a
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compiled regex, it is used for matching.
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- If the value is any other type, == is used.
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Return:
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A bool
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"""
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regex_type = type(re.compile(''))
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if expected is None:
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return True
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elif isinstance(expected, regex_type):
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return expected.search(value)
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elif isinstance(value, (bytes, str)):
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return utils.pattern_match(pattern=expected, value=value)
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else:
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return value == expected
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def _wait_for_existing(self, override_waited_for, after, **kwargs):
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"""Check if there are any line in the history for wait_for.
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Return: either the found line or None.
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"""
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for line in self._data:
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matches = []
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for key, expected in kwargs.items():
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value = getattr(line, key)
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matches.append(self._match_data(value, expected))
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if after is None:
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too_early = False
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else:
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too_early = ((line.timestamp, line.msecs) <
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(after.timestamp, after.msecs))
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if (all(matches) and
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(not line.waited_for or override_waited_for) and
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not too_early):
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# If we waited for this line, chances are we don't mean the
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# same thing the next time we use wait_for and it matches
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# this line again.
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line.waited_for = True
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self._log("\n----> Already found {!r} in the log: {}".format(
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kwargs.get('message', 'line'), line))
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return line
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return None
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def _wait_for_new(self, timeout, do_skip, **kwargs):
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"""Wait for a log message which doesn't exist yet.
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Called via wait_for.
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"""
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__tracebackhide__ = lambda e: e.errisinstance(WaitForTimeout)
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message = kwargs.get('message', None)
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if message is not None:
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elided = quteutils.elide(repr(message), 100)
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self._log("\n----> Waiting for {} in the log".format(elided))
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spy = QSignalSpy(self.new_data)
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elapsed_timer = QElapsedTimer()
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elapsed_timer.start()
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while True:
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# Skip if there are pending messages causing a skip
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self._maybe_skip()
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got_signal = spy.wait(timeout)
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if not got_signal or elapsed_timer.hasExpired(timeout):
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msg = "Timed out after {}ms waiting for {!r}.".format(
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timeout, kwargs)
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if do_skip:
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pytest.skip(msg)
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else:
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raise WaitForTimeout(msg)
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match = self._wait_for_match(spy, kwargs)
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if match is not None:
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if message is not None:
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self._log("----> found it")
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return match
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raise quteutils.Unreachable
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def _wait_for_match(self, spy, kwargs):
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"""Try matching the kwargs with the given QSignalSpy."""
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for args in spy:
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assert len(args) == 1
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line = args[0]
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matches = []
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for key, expected in kwargs.items():
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value = getattr(line, key)
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matches.append(self._match_data(value, expected))
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if all(matches):
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# If we waited for this line, chances are we don't mean the
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# same thing the next time we use wait_for and it matches
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# this line again.
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line.waited_for = True
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return line
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return None
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def _maybe_skip(self):
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"""Can be overridden by subclasses to skip on certain log lines.
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We can't run pytest.skip directly while parsing the log, as that would
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lead to a pytest.skip.Exception error in a virtual Qt method, which
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means pytest-qt fails the test.
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Instead, we check for skip messages periodically in
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QuteProc._maybe_skip, and call _maybe_skip after every parsed message
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in wait_for (where it's most likely that new messages arrive).
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"""
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pass
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def wait_for(self, timeout=None, *, override_waited_for=False,
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do_skip=False, divisor=1, after=None, **kwargs):
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"""Wait until a given value is found in the data.
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Keyword arguments to this function get interpreted as attributes of the
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searched data. Every given argument is treated as a pattern which
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the attribute has to match against.
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Args:
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timeout: How long to wait for the message.
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override_waited_for: If set, gets triggered by previous messages
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again.
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do_skip: If set, call pytest.skip on a timeout.
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divisor: A factor to decrease the timeout by.
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after: If it's an existing line, ensure it's after the given one.
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Return:
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The matched line.
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"""
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__tracebackhide__ = lambda e: e.errisinstance(WaitForTimeout)
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if timeout is None:
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if do_skip:
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timeout = 2000
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elif 'CI' in os.environ:
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timeout = 15000
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else:
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timeout = 5000
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timeout /= divisor
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if not kwargs:
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raise TypeError("No keyword arguments given!")
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for key in kwargs:
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assert key in self.KEYS
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existing = self._wait_for_existing(override_waited_for, after,
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**kwargs)
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if existing is not None:
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return existing
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else:
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return self._wait_for_new(timeout=timeout, do_skip=do_skip,
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**kwargs)
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def ensure_not_logged(self, delay=500, **kwargs):
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"""Make sure the data matching the given arguments is not logged.
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If nothing is found in the log, we wait for delay ms to make sure
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nothing arrives.
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"""
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__tracebackhide__ = lambda e: e.errisinstance(BlacklistedMessageError)
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try:
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line = self.wait_for(timeout=delay, override_waited_for=True,
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**kwargs)
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except WaitForTimeout:
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return
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else:
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raise BlacklistedMessageError(line)
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def wait_for_quit(self):
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"""Wait until the process has quit."""
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self.exit_expected = True
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with self._wait_signal(self.proc.finished, timeout=15000):
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pass
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