test_ok2/_pytest/capture.py

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