473 lines
14 KiB
Python
473 lines
14 KiB
Python
"""
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per-test stdout/stderr capturing mechanism.
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"""
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from __future__ import with_statement
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import sys
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import os
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from tempfile import TemporaryFile
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import py
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import pytest
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from py.io import TextIO
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unicode = py.builtin.text
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patchsysdict = {0: 'stdin', 1: 'stdout', 2: 'stderr'}
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def pytest_addoption(parser):
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group = parser.getgroup("general")
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group._addoption(
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'--capture', action="store",
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default="fd" if hasattr(os, "dup") else "sys",
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metavar="method", choices=['fd', 'sys', 'no'],
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help="per-test capturing method: one of fd|sys|no.")
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group._addoption(
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'-s', action="store_const", const="no", dest="capture",
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help="shortcut for --capture=no.")
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@pytest.hookimpl(hookwrapper=True)
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def pytest_load_initial_conftests(early_config, parser, args):
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_readline_workaround()
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ns = early_config.known_args_namespace
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pluginmanager = early_config.pluginmanager
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capman = CaptureManager(ns.capture)
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pluginmanager.register(capman, "capturemanager")
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# make sure that capturemanager is properly reset at final shutdown
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early_config.add_cleanup(capman.reset_capturings)
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# make sure logging does not raise exceptions at the end
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def silence_logging_at_shutdown():
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if "logging" in sys.modules:
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sys.modules["logging"].raiseExceptions = False
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early_config.add_cleanup(silence_logging_at_shutdown)
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# finally trigger conftest loading but while capturing (issue93)
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capman.init_capturings()
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outcome = yield
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out, err = capman.suspendcapture()
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if outcome.excinfo is not None:
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sys.stdout.write(out)
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sys.stderr.write(err)
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class CaptureManager:
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def __init__(self, method):
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self._method = method
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def _getcapture(self, method):
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if method == "fd":
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return MultiCapture(out=True, err=True, Capture=FDCapture)
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elif method == "sys":
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return MultiCapture(out=True, err=True, Capture=SysCapture)
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elif method == "no":
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return MultiCapture(out=False, err=False, in_=False)
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else:
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raise ValueError("unknown capturing method: %r" % method)
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def init_capturings(self):
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assert not hasattr(self, "_capturing")
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self._capturing = self._getcapture(self._method)
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self._capturing.start_capturing()
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def reset_capturings(self):
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cap = self.__dict__.pop("_capturing", None)
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if cap is not None:
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cap.pop_outerr_to_orig()
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cap.stop_capturing()
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def resumecapture(self):
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self._capturing.resume_capturing()
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def suspendcapture(self, in_=False):
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self.deactivate_funcargs()
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cap = getattr(self, "_capturing", None)
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if cap is not None:
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try:
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outerr = cap.readouterr()
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finally:
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cap.suspend_capturing(in_=in_)
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return outerr
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def activate_funcargs(self, pyfuncitem):
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capfuncarg = pyfuncitem.__dict__.pop("_capfuncarg", None)
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if capfuncarg is not None:
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capfuncarg._start()
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self._capfuncarg = capfuncarg
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def deactivate_funcargs(self):
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capfuncarg = self.__dict__.pop("_capfuncarg", None)
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if capfuncarg is not None:
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capfuncarg.close()
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@pytest.hookimpl(hookwrapper=True)
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def pytest_make_collect_report(self, collector):
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if isinstance(collector, pytest.File):
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self.resumecapture()
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outcome = yield
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out, err = self.suspendcapture()
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rep = outcome.get_result()
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if out:
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rep.sections.append(("Captured stdout", out))
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if err:
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rep.sections.append(("Captured stderr", err))
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else:
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yield
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@pytest.hookimpl(hookwrapper=True)
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def pytest_runtest_setup(self, item):
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self.resumecapture()
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yield
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self.suspendcapture_item(item, "setup")
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@pytest.hookimpl(hookwrapper=True)
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def pytest_runtest_call(self, item):
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self.resumecapture()
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self.activate_funcargs(item)
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yield
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#self.deactivate_funcargs() called from suspendcapture()
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self.suspendcapture_item(item, "call")
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@pytest.hookimpl(hookwrapper=True)
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def pytest_runtest_teardown(self, item):
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self.resumecapture()
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yield
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self.suspendcapture_item(item, "teardown")
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@pytest.hookimpl(tryfirst=True)
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def pytest_keyboard_interrupt(self, excinfo):
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self.reset_capturings()
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@pytest.hookimpl(tryfirst=True)
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def pytest_internalerror(self, excinfo):
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self.reset_capturings()
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def suspendcapture_item(self, item, when):
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out, err = self.suspendcapture()
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item.add_report_section(when, "stdout", out)
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item.add_report_section(when, "stderr", err)
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error_capsysfderror = "cannot use capsys and capfd at the same time"
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@pytest.fixture
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def capsys(request):
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"""enables capturing of writes to sys.stdout/sys.stderr and makes
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captured output available via ``capsys.readouterr()`` method calls
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which return a ``(out, err)`` tuple.
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"""
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if "capfd" in request._funcargs:
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raise request.raiseerror(error_capsysfderror)
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request.node._capfuncarg = c = CaptureFixture(SysCapture)
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return c
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@pytest.fixture
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def capfd(request):
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"""enables capturing of writes to file descriptors 1 and 2 and makes
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captured output available via ``capfd.readouterr()`` method calls
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which return a ``(out, err)`` tuple.
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"""
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if "capsys" in request._funcargs:
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request.raiseerror(error_capsysfderror)
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if not hasattr(os, 'dup'):
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pytest.skip("capfd funcarg needs os.dup")
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request.node._capfuncarg = c = CaptureFixture(FDCapture)
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return c
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class CaptureFixture:
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def __init__(self, captureclass):
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self.captureclass = captureclass
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def _start(self):
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self._capture = MultiCapture(out=True, err=True, in_=False,
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Capture=self.captureclass)
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self._capture.start_capturing()
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def close(self):
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cap = self.__dict__.pop("_capture", None)
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if cap is not None:
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self._outerr = cap.pop_outerr_to_orig()
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cap.stop_capturing()
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def readouterr(self):
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try:
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return self._capture.readouterr()
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except AttributeError:
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return self._outerr
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def safe_text_dupfile(f, mode, default_encoding="UTF8"):
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""" return a open text file object that's a duplicate of f on the
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FD-level if possible.
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"""
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encoding = getattr(f, "encoding", None)
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try:
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fd = f.fileno()
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except Exception:
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if "b" not in getattr(f, "mode", "") and hasattr(f, "encoding"):
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# we seem to have a text stream, let's just use it
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return f
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else:
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newfd = os.dup(fd)
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if "b" not in mode:
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mode += "b"
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f = os.fdopen(newfd, mode, 0) # no buffering
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return EncodedFile(f, encoding or default_encoding)
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class EncodedFile(object):
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errors = "strict" # possibly needed by py3 code (issue555)
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def __init__(self, buffer, encoding):
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self.buffer = buffer
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self.encoding = encoding
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def write(self, obj):
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if isinstance(obj, unicode):
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obj = obj.encode(self.encoding, "replace")
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self.buffer.write(obj)
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def writelines(self, linelist):
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data = ''.join(linelist)
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self.write(data)
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def __getattr__(self, name):
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return getattr(object.__getattribute__(self, "buffer"), name)
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class MultiCapture(object):
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out = err = in_ = None
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def __init__(self, out=True, err=True, in_=True, Capture=None):
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if in_:
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self.in_ = Capture(0)
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if out:
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self.out = Capture(1)
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if err:
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self.err = Capture(2)
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def start_capturing(self):
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if self.in_:
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self.in_.start()
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if self.out:
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self.out.start()
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if self.err:
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self.err.start()
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def pop_outerr_to_orig(self):
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""" pop current snapshot out/err capture and flush to orig streams. """
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out, err = self.readouterr()
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if out:
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self.out.writeorg(out)
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if err:
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self.err.writeorg(err)
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return out, err
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def suspend_capturing(self, in_=False):
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if self.out:
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self.out.suspend()
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if self.err:
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self.err.suspend()
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if in_ and self.in_:
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self.in_.suspend()
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self._in_suspended = True
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def resume_capturing(self):
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if self.out:
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self.out.resume()
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if self.err:
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self.err.resume()
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if hasattr(self, "_in_suspended"):
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self.in_.resume()
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del self._in_suspended
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def stop_capturing(self):
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""" stop capturing and reset capturing streams """
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if hasattr(self, '_reset'):
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raise ValueError("was already stopped")
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self._reset = True
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if self.out:
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self.out.done()
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if self.err:
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self.err.done()
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if self.in_:
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self.in_.done()
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def readouterr(self):
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""" return snapshot unicode value of stdout/stderr capturings. """
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return (self.out.snap() if self.out is not None else "",
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self.err.snap() if self.err is not None else "")
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class NoCapture:
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__init__ = start = done = suspend = resume = lambda *args: None
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class FDCapture:
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""" Capture IO to/from a given os-level filedescriptor. """
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def __init__(self, targetfd, tmpfile=None):
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self.targetfd = targetfd
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try:
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self.targetfd_save = os.dup(self.targetfd)
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except OSError:
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self.start = lambda: None
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self.done = lambda: None
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else:
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if targetfd == 0:
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assert not tmpfile, "cannot set tmpfile with stdin"
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tmpfile = open(os.devnull, "r")
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self.syscapture = SysCapture(targetfd)
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else:
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if tmpfile is None:
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f = TemporaryFile()
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with f:
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tmpfile = safe_text_dupfile(f, mode="wb+")
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if targetfd in patchsysdict:
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self.syscapture = SysCapture(targetfd, tmpfile)
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else:
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self.syscapture = NoCapture()
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self.tmpfile = tmpfile
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self.tmpfile_fd = tmpfile.fileno()
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def __repr__(self):
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return "<FDCapture %s oldfd=%s>" % (self.targetfd, self.targetfd_save)
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def start(self):
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""" Start capturing on targetfd using memorized tmpfile. """
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try:
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os.fstat(self.targetfd_save)
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except (AttributeError, OSError):
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raise ValueError("saved filedescriptor not valid anymore")
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os.dup2(self.tmpfile_fd, self.targetfd)
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self.syscapture.start()
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def snap(self):
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f = self.tmpfile
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f.seek(0)
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res = f.read()
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if res:
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enc = getattr(f, "encoding", None)
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if enc and isinstance(res, bytes):
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res = py.builtin._totext(res, enc, "replace")
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f.truncate(0)
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f.seek(0)
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return res
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return ''
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def done(self):
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""" stop capturing, restore streams, return original capture file,
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seeked to position zero. """
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targetfd_save = self.__dict__.pop("targetfd_save")
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os.dup2(targetfd_save, self.targetfd)
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os.close(targetfd_save)
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self.syscapture.done()
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self.tmpfile.close()
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def suspend(self):
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self.syscapture.suspend()
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os.dup2(self.targetfd_save, self.targetfd)
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def resume(self):
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self.syscapture.resume()
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os.dup2(self.tmpfile_fd, self.targetfd)
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def writeorg(self, data):
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""" write to original file descriptor. """
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if py.builtin._istext(data):
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data = data.encode("utf8") # XXX use encoding of original stream
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os.write(self.targetfd_save, data)
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class SysCapture:
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def __init__(self, fd, tmpfile=None):
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name = patchsysdict[fd]
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self._old = getattr(sys, name)
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self.name = name
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if tmpfile is None:
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if name == "stdin":
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tmpfile = DontReadFromInput()
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else:
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tmpfile = TextIO()
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self.tmpfile = tmpfile
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def start(self):
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setattr(sys, self.name, self.tmpfile)
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def snap(self):
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f = self.tmpfile
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res = f.getvalue()
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f.truncate(0)
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f.seek(0)
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return res
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def done(self):
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setattr(sys, self.name, self._old)
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del self._old
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self.tmpfile.close()
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def suspend(self):
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setattr(sys, self.name, self._old)
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def resume(self):
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setattr(sys, self.name, self.tmpfile)
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def writeorg(self, data):
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self._old.write(data)
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self._old.flush()
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class DontReadFromInput:
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"""Temporary stub class. Ideally when stdin is accessed, the
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capturing should be turned off, with possibly all data captured
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so far sent to the screen. This should be configurable, though,
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because in automated test runs it is better to crash than
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hang indefinitely.
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"""
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encoding = None
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def read(self, *args):
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raise IOError("reading from stdin while output is captured")
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readline = read
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readlines = read
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__iter__ = read
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def fileno(self):
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raise ValueError("redirected Stdin is pseudofile, has no fileno()")
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def isatty(self):
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return False
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def close(self):
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pass
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def _readline_workaround():
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"""
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Ensure readline is imported so that it attaches to the correct stdio
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handles on Windows.
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Pdb uses readline support where available--when not running from the Python
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prompt, the readline module is not imported until running the pdb REPL. If
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running py.test with the --pdb option this means the readline module is not
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imported until after I/O capture has been started.
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This is a problem for pyreadline, which is often used to implement readline
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support on Windows, as it does not attach to the correct handles for stdout
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and/or stdin if they have been redirected by the FDCapture mechanism. This
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workaround ensures that readline is imported before I/O capture is setup so
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that it can attach to the actual stdin/out for the console.
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See https://github.com/pytest-dev/pytest/pull/1281
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"""
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if not sys.platform.startswith('win32'):
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return
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try:
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import readline # noqa
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except ImportError:
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pass
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