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""" Test running processes with the APIs in L{twisted.internet.utils}. """ from __future__ import division, absolute_import import warnings, os, stat, sys, signal from twisted.python.compat import _PY3 from twisted.python.runtime import platform from twisted.trial import unittest from twisted.internet import error, reactor, utils, interfaces from twisted.internet.defer import Deferred from twisted.python.test.test_util import SuppressedWarningsTests class ProcessUtilsTests(unittest.TestCase): """ Test running a process using L{getProcessOutput}, L{getProcessValue}, and L{getProcessOutputAndValue}. """ if interfaces.IReactorProcess(reactor, None) is None: skip = "reactor doesn't implement IReactorProcess" output = None value = None exe = sys.executable def makeSourceFile(self, sourceLines): """ Write the given list of lines to a text file and return the absolute path to it. """ script = self.mktemp() with open(script, 'wt') as scriptFile: scriptFile.write(os.linesep.join(sourceLines) + os.linesep) return os.path.abspath(script) def test_output(self): """ L{getProcessOutput} returns a L{Deferred} which fires with the complete output of the process it runs after that process exits. """ scriptFile = self.makeSourceFile([ "import sys", "for s in b'hello world\\n':", " if hasattr(sys.stdout, 'buffer'):", " # Python 3", " s = bytes([s])", " sys.stdout.buffer.write(s)", " else:", " # Python 2", " sys.stdout.write(s)", " sys.stdout.flush()"]) d = utils.getProcessOutput(self.exe, ['-u', scriptFile]) return d.addCallback(self.assertEqual, b"hello world\n") def test_outputWithErrorIgnored(self): """ The L{Deferred} returned by L{getProcessOutput} is fired with an L{IOError} L{Failure} if the child process writes to stderr. """ # make sure stderr raises an error normally scriptFile = self.makeSourceFile([ 'import sys', 'sys.stderr.write("hello world\\n")' ]) d = utils.getProcessOutput(self.exe, ['-u', scriptFile]) d = self.assertFailure(d, IOError) def cbFailed(err): return self.assertFailure(err.processEnded, error.ProcessDone) d.addCallback(cbFailed) return d def test_outputWithErrorCollected(self): """ If a C{True} value is supplied for the C{errortoo} parameter to L{getProcessOutput}, the returned L{Deferred} fires with the child's stderr output as well as its stdout output. """ scriptFile = self.makeSourceFile([ 'import sys', # Write the same value to both because ordering isn't guaranteed so # this simplifies the test. 'sys.stdout.write("foo")', 'sys.stdout.flush()', 'sys.stderr.write("foo")', 'sys.stderr.flush()']) d = utils.getProcessOutput(self.exe, ['-u', scriptFile], errortoo=True) return d.addCallback(self.assertEqual, b"foofoo") def test_value(self): """ The L{Deferred} returned by L{getProcessValue} is fired with the exit status of the child process. """ scriptFile = self.makeSourceFile(["raise SystemExit(1)"]) d = utils.getProcessValue(self.exe, ['-u', scriptFile]) return d.addCallback(self.assertEqual, 1) def test_outputAndValue(self): """ The L{Deferred} returned by L{getProcessOutputAndValue} fires with a three-tuple, the elements of which give the data written to the child's stdout, the data written to the child's stderr, and the exit status of the child. """ scriptFile = self.makeSourceFile([ "import sys", "if hasattr(sys.stdout, 'buffer'):", " # Python 3", " sys.stdout.buffer.write(b'hello world!\\n')", " sys.stderr.buffer.write(b'goodbye world!\\n')", "else:", " # Python 2", " sys.stdout.write(b'hello world!\\n')", " sys.stderr.write(b'goodbye world!\\n')", "sys.exit(1)" ]) def gotOutputAndValue(out_err_code): out, err, code = out_err_code self.assertEqual(out, b"hello world!\n") if _PY3: self.assertEqual(err, b"goodbye world!\n") else: self.assertEqual(err, b"goodbye world!" + os.linesep) self.assertEqual(code, 1) d = utils.getProcessOutputAndValue(self.exe, ["-u", scriptFile]) return d.addCallback(gotOutputAndValue) def test_outputSignal(self): """ If the child process exits because of a signal, the L{Deferred} returned by L{getProcessOutputAndValue} fires a L{Failure} of a tuple containing the child's stdout, stderr, and the signal which caused it to exit. """ # Use SIGKILL here because it's guaranteed to be delivered. Using # SIGHUP might not work in, e.g., a buildbot slave run under the # 'nohup' command. scriptFile = self.makeSourceFile([ "import sys, os, signal", "sys.stdout.write('stdout bytes\\n')", "sys.stderr.write('stderr bytes\\n')", "sys.stdout.flush()", "sys.stderr.flush()", "os.kill(os.getpid(), signal.SIGKILL)"]) def gotOutputAndValue(out_err_sig): out, err, sig = out_err_sig self.assertEqual(out, b"stdout bytes\n") self.assertEqual(err, b"stderr bytes\n") self.assertEqual(sig, signal.SIGKILL) d = utils.getProcessOutputAndValue(self.exe, ['-u', scriptFile]) d = self.assertFailure(d, tuple) return d.addCallback(gotOutputAndValue) if platform.isWindows(): test_outputSignal.skip = "Windows doesn't have real signals." def _pathTest(self, utilFunc, check): dir = os.path.abspath(self.mktemp()) os.makedirs(dir) scriptFile = self.makeSourceFile([ "import os, sys", "sys.stdout.write(os.getcwd())"]) d = utilFunc(self.exe, ['-u', scriptFile], path=dir) d.addCallback(check, dir.encode(sys.getfilesystemencoding())) return d def test_getProcessOutputPath(self): """ L{getProcessOutput} runs the given command with the working directory given by the C{path} parameter. """ return self._pathTest(utils.getProcessOutput, self.assertEqual) def test_getProcessValuePath(self): """ L{getProcessValue} runs the given command with the working directory given by the C{path} parameter. """ def check(result, ignored): self.assertEqual(result, 0) return self._pathTest(utils.getProcessValue, check) def test_getProcessOutputAndValuePath(self): """ L{getProcessOutputAndValue} runs the given command with the working directory given by the C{path} parameter. """ def check(out_err_status, dir): out, err, status = out_err_status self.assertEqual(out, dir) self.assertEqual(status, 0) return self._pathTest(utils.getProcessOutputAndValue, check) def _defaultPathTest(self, utilFunc, check): # Make another directory to mess around with. dir = os.path.abspath(self.mktemp()) os.makedirs(dir) scriptFile = self.makeSourceFile([ "import os, sys, stat", # Fix the permissions so we can report the working directory. # On macOS (and maybe elsewhere), os.getcwd() fails with EACCES # if +x is missing from the working directory. "os.chmod(%r, stat.S_IXUSR)" % (dir,), "sys.stdout.write(os.getcwd())"]) # Switch to it, but make sure we switch back self.addCleanup(os.chdir, os.getcwd()) os.chdir(dir) # Get rid of all its permissions, but make sure they get cleaned up # later, because otherwise it might be hard to delete the trial # temporary directory. self.addCleanup( os.chmod, dir, stat.S_IMODE(os.stat('.').st_mode)) os.chmod(dir, 0) # Pass in -S so that if run using the coverage .pth trick, it won't be # loaded and cause Coverage to try and get the current working # directory (see the comments above why this can be a problem) on OSX. d = utilFunc(self.exe, ['-S', '-u', scriptFile]) d.addCallback(check, dir.encode(sys.getfilesystemencoding())) return d def test_getProcessOutputDefaultPath(self): """ If no value is supplied for the C{path} parameter, L{getProcessOutput} runs the given command in the same working directory as the parent process and succeeds even if the current working directory is not accessible. """ return self._defaultPathTest(utils.getProcessOutput, self.assertEqual) def test_getProcessValueDefaultPath(self): """ If no value is supplied for the C{path} parameter, L{getProcessValue} runs the given command in the same working directory as the parent process and succeeds even if the current working directory is not accessible. """ def check(result, ignored): self.assertEqual(result, 0) return self._defaultPathTest(utils.getProcessValue, check) def test_getProcessOutputAndValueDefaultPath(self): """ If no value is supplied for the C{path} parameter, L{getProcessOutputAndValue} runs the given command in the same working directory as the parent process and succeeds even if the current working directory is not accessible. """ def check(out_err_status, dir): out, err, status = out_err_status self.assertEqual(out, dir) self.assertEqual(status, 0) return self._defaultPathTest( utils.getProcessOutputAndValue, check) class SuppressWarningsTests(unittest.SynchronousTestCase): """ Tests for L{utils.suppressWarnings}. """ def test_suppressWarnings(self): """ L{utils.suppressWarnings} decorates a function so that the given warnings are suppressed. """ result = [] def showwarning(self, *a, **kw): result.append((a, kw)) self.patch(warnings, "showwarning", showwarning) def f(msg): warnings.warn(msg) g = utils.suppressWarnings(f, (('ignore',), dict(message="This is message"))) # Start off with a sanity check - calling the original function # should emit the warning. f("Sanity check message") self.assertEqual(len(result), 1) # Now that that's out of the way, call the wrapped function, and # make sure no new warnings show up. g("This is message") self.assertEqual(len(result), 1) # Finally, emit another warning which should not be ignored, and # make sure it is not. g("Unignored message") self.assertEqual(len(result), 2) class DeferredSuppressedWarningsTests(SuppressedWarningsTests): """ Tests for L{utils.runWithWarningsSuppressed}, the version that supports Deferreds. """ # Override the non-Deferred-supporting function from the base class with # the function we are testing in this class: runWithWarningsSuppressed = staticmethod(utils.runWithWarningsSuppressed) def test_deferredCallback(self): """ If the function called by L{utils.runWithWarningsSuppressed} returns a C{Deferred}, the warning filters aren't removed until the Deferred fires. """ filters = [(("ignore", ".*foo.*"), {}), (("ignore", ".*bar.*"), {})] result = Deferred() self.runWithWarningsSuppressed(filters, lambda: result) warnings.warn("ignore foo") result.callback(3) warnings.warn("ignore foo 2") self.assertEqual( ["ignore foo 2"], [w['message'] for w in self.flushWarnings()]) def test_deferredErrback(self): """ If the function called by L{utils.runWithWarningsSuppressed} returns a C{Deferred}, the warning filters aren't removed until the Deferred fires with an errback. """ filters = [(("ignore", ".*foo.*"), {}), (("ignore", ".*bar.*"), {})] result = Deferred() d = self.runWithWarningsSuppressed(filters, lambda: result) warnings.warn("ignore foo") result.errback(ZeroDivisionError()) d.addErrback(lambda f: f.trap(ZeroDivisionError)) warnings.warn("ignore foo 2") self.assertEqual( ["ignore foo 2"], [w['message'] for w in self.flushWarnings()])