Viewing file:  test_process.py (75.96 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
# Copyright (c) 2001-2010 Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test running processes.
"""
import gzip
import os
import sys
import signal
import StringIO
import errno
import gc
import stat
try:
import fcntl
except ImportError:
fcntl = process = None
else:
from twisted.internet import process
from zope.interface.verify import verifyObject
from twisted.python.log import msg
from twisted.internet import reactor, protocol, error, interfaces, defer
from twisted.trial import unittest
from twisted.python import util, runtime, procutils
from twisted.python.compat import set
class StubProcessProtocol(protocol.ProcessProtocol):
"""
ProcessProtocol counter-implementation: all methods on this class raise an
exception, so instances of this may be used to verify that only certain
methods are called.
"""
def outReceived(self, data):
raise NotImplementedError()
def errReceived(self, data):
raise NotImplementedError()
def inConnectionLost(self):
raise NotImplementedError()
def outConnectionLost(self):
raise NotImplementedError()
def errConnectionLost(self):
raise NotImplementedError()
class ProcessProtocolTests(unittest.TestCase):
"""
Tests for behavior provided by the process protocol base class,
L{protocol.ProcessProtocol}.
"""
def test_interface(self):
"""
L{ProcessProtocol} implements L{IProcessProtocol}.
"""
verifyObject(interfaces.IProcessProtocol, protocol.ProcessProtocol())
def test_outReceived(self):
"""
Verify that when stdout is delivered to
L{ProcessProtocol.childDataReceived}, it is forwarded to
L{ProcessProtocol.outReceived}.
"""
received = []
class OutProtocol(StubProcessProtocol):
def outReceived(self, data):
received.append(data)
bytes = "bytes"
p = OutProtocol()
p.childDataReceived(1, bytes)
self.assertEqual(received, [bytes])
def test_errReceived(self):
"""
Similar to L{test_outReceived}, but for stderr.
"""
received = []
class ErrProtocol(StubProcessProtocol):
def errReceived(self, data):
received.append(data)
bytes = "bytes"
p = ErrProtocol()
p.childDataReceived(2, bytes)
self.assertEqual(received, [bytes])
def test_inConnectionLost(self):
"""
Verify that when stdin close notification is delivered to
L{ProcessProtocol.childConnectionLost}, it is forwarded to
L{ProcessProtocol.inConnectionLost}.
"""
lost = []
class InLostProtocol(StubProcessProtocol):
def inConnectionLost(self):
lost.append(None)
p = InLostProtocol()
p.childConnectionLost(0)
self.assertEqual(lost, [None])
def test_outConnectionLost(self):
"""
Similar to L{test_inConnectionLost}, but for stdout.
"""
lost = []
class OutLostProtocol(StubProcessProtocol):
def outConnectionLost(self):
lost.append(None)
p = OutLostProtocol()
p.childConnectionLost(1)
self.assertEqual(lost, [None])
def test_errConnectionLost(self):
"""
Similar to L{test_inConnectionLost}, but for stderr.
"""
lost = []
class ErrLostProtocol(StubProcessProtocol):
def errConnectionLost(self):
lost.append(None)
p = ErrLostProtocol()
p.childConnectionLost(2)
self.assertEqual(lost, [None])
class TrivialProcessProtocol(protocol.ProcessProtocol):
"""
Simple process protocol for tests purpose.
@ivar outData: data received from stdin
@ivar errData: data received from stderr
"""
def __init__(self, d):
"""
Create the deferred that will be fired at the end, and initialize
data structures.
"""
self.deferred = d
self.outData = []
self.errData = []
def processEnded(self, reason):
self.reason = reason
self.deferred.callback(None)
def outReceived(self, data):
self.outData.append(data)
def errReceived(self, data):
self.errData.append(data)
class TestProcessProtocol(protocol.ProcessProtocol):
def connectionMade(self):
self.stages = [1]
self.data = ''
self.err = ''
self.transport.write("abcd")
def childDataReceived(self, childFD, data):
"""
Override and disable the dispatch provided by the base class to ensure
that it is really this method which is being called, and the transport
is not going directly to L{outReceived} or L{errReceived}.
"""
if childFD == 1:
self.data += data
elif childFD == 2:
self.err += data
def childConnectionLost(self, childFD):
"""
Similarly to L{childDataReceived}, disable the automatic dispatch
provided by the base implementation to verify that the transport is
calling this method directly.
"""
if childFD == 1:
self.stages.append(2)
if self.data != "abcd":
raise RuntimeError
self.transport.write("1234")
elif childFD == 2:
self.stages.append(3)
if self.err != "1234":
print 'err != 1234: ' + repr(self.err)
raise RuntimeError()
self.transport.write("abcd")
self.stages.append(4)
elif childFD == 0:
self.stages.append(5)
def processEnded(self, reason):
self.reason = reason
self.deferred.callback(None)
class EchoProtocol(protocol.ProcessProtocol):
s = "1234567" * 1001
n = 10
finished = 0
failure = None
def __init__(self, onEnded):
self.onEnded = onEnded
self.count = 0
def connectionMade(self):
assert self.n > 2
for i in range(self.n - 2):
self.transport.write(self.s)
# test writeSequence
self.transport.writeSequence([self.s, self.s])
self.buffer = self.s * self.n
def outReceived(self, data):
if buffer(self.buffer, self.count, len(data)) != buffer(data):
self.failure = ("wrong bytes received", data, self.count)
self.transport.closeStdin()
else:
self.count += len(data)
if self.count == len(self.buffer):
self.transport.closeStdin()
def processEnded(self, reason):
self.finished = 1
if not reason.check(error.ProcessDone):
self.failure = "process didn't terminate normally: " + str(reason)
self.onEnded.callback(self)
class SignalProtocol(protocol.ProcessProtocol):
"""
A process protocol that sends a signal when data is first received.
@ivar deferred: deferred firing on C{processEnded}.
@type deferred: L{defer.Deferred}
@ivar signal: the signal to send to the process.
@type signal: C{str}
@ivar signaled: A flag tracking whether the signal has been sent to the
child or not yet. C{False} until it is sent, then C{True}.
@type signaled: C{bool}
"""
def __init__(self, deferred, sig):
self.deferred = deferred
self.signal = sig
self.signaled = False
def outReceived(self, data):
"""
Handle the first output from the child process (which indicates it
is set up and ready to receive the signal) by sending the signal to
it. Also log all output to help with debugging.
"""
msg("Received %r from child stdout" % (data,))
if not self.signaled:
self.signaled = True
self.transport.signalProcess(self.signal)
def errReceived(self, data):
"""
Log all data received from the child's stderr to help with
debugging.
"""
msg("Received %r from child stderr" % (data,))
def processEnded(self, reason):
"""
Callback C{self.deferred} with C{None} if C{reason} is a
L{error.ProcessTerminated} failure with C{exitCode} set to C{None},
C{signal} set to C{self.signal}, and C{status} holding the status code
of the exited process. Otherwise, errback with a C{ValueError}
describing the problem.
"""
msg("Child exited: %r" % (reason.getTraceback(),))
if not reason.check(error.ProcessTerminated):
return self.deferred.errback(
ValueError("wrong termination: %s" % (reason,)))
v = reason.value
if isinstance(self.signal, str):
signalValue = getattr(signal, 'SIG' + self.signal)
else:
signalValue = self.signal
if v.exitCode is not None:
return self.deferred.errback(
ValueError("SIG%s: exitCode is %s, not None" %
(self.signal, v.exitCode)))
if v.signal != signalValue:
return self.deferred.errback(
ValueError("SIG%s: .signal was %s, wanted %s" %
(self.signal, v.signal, signalValue)))
if os.WTERMSIG(v.status) != signalValue:
return self.deferred.errback(
ValueError('SIG%s: %s' % (self.signal, os.WTERMSIG(v.status))))
self.deferred.callback(None)
class TestManyProcessProtocol(TestProcessProtocol):
def __init__(self):
self.deferred = defer.Deferred()
def processEnded(self, reason):
self.reason = reason
if reason.check(error.ProcessDone):
self.deferred.callback(None)
else:
self.deferred.errback(reason)
class UtilityProcessProtocol(protocol.ProcessProtocol):
"""
Helper class for launching a Python process and getting a result from it.
@ivar program: A string giving a Python program for the child process to
run.
"""
program = None
def run(cls, reactor, argv, env):
"""
Run a Python process connected to a new instance of this protocol
class. Return the protocol instance.
The Python process is given C{self.program} on the command line to
execute, in addition to anything specified by C{argv}. C{env} is
the complete environment.
"""
exe = sys.executable
self = cls()
reactor.spawnProcess(
self, exe, [exe, "-c", self.program] + argv, env=env)
return self
run = classmethod(run)
def __init__(self):
self.bytes = []
self.requests = []
def parseChunks(self, bytes):
"""
Called with all bytes received on stdout when the process exits.
"""
raise NotImplementedError()
def getResult(self):
"""
Return a Deferred which will fire with the result of L{parseChunks}
when the child process exits.
"""
d = defer.Deferred()
self.requests.append(d)
return d
def _fireResultDeferreds(self, result):
"""
Callback all Deferreds returned up until now by L{getResult}
with the given result object.
"""
requests = self.requests
self.requests = None
for d in requests:
d.callback(result)
def outReceived(self, bytes):
"""
Accumulate output from the child process in a list.
"""
self.bytes.append(bytes)
def processEnded(self, reason):
"""
Handle process termination by parsing all received output and firing
any waiting Deferreds.
"""
self._fireResultDeferreds(self.parseChunks(self.bytes))
class GetArgumentVector(UtilityProcessProtocol):
"""
Protocol which will read a serialized argv from a process and
expose it to interested parties.
"""
program = (
"from sys import stdout, argv\n"
"stdout.write(chr(0).join(argv))\n"
"stdout.flush()\n")
def parseChunks(self, chunks):
"""
Parse the output from the process to which this protocol was
connected, which is a single unterminated line of \\0-separated
strings giving the argv of that process. Return this as a list of
str objects.
"""
return ''.join(chunks).split('\0')
class GetEnvironmentDictionary(UtilityProcessProtocol):
"""
Protocol which will read a serialized environment dict from a process
and expose it to interested parties.
"""
program = (
"from sys import stdout\n"
"from os import environ\n"
"items = environ.iteritems()\n"
"stdout.write(chr(0).join([k + chr(0) + v for k, v in items]))\n"
"stdout.flush()\n")
def parseChunks(self, chunks):
"""
Parse the output from the process to which this protocol was
connected, which is a single unterminated line of \\0-separated
strings giving key value pairs of the environment from that process.
Return this as a dictionary.
"""
environString = ''.join(chunks)
if not environString:
return {}
environ = iter(environString.split('\0'))
d = {}
while 1:
try:
k = environ.next()
except StopIteration:
break
else:
v = environ.next()
d[k] = v
return d
class ProcessTestCase(unittest.TestCase):
"""Test running a process."""
usePTY = False
def testStdio(self):
"""twisted.internet.stdio test."""
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_twisted.py")
p = Accumulator()
d = p.endedDeferred = defer.Deferred()
env = {"PYTHONPATH": os.pathsep.join(sys.path)}
reactor.spawnProcess(p, exe, [exe, "-u", scriptPath], env=env,
path=None, usePTY=self.usePTY)
p.transport.write("hello, world")
p.transport.write("abc")
p.transport.write("123")
p.transport.closeStdin()
def processEnded(ign):
self.assertEquals(p.outF.getvalue(), "hello, worldabc123",
"Output follows:\n"
"%s\n"
"Error message from process_twisted follows:\n"
"%s\n" % (p.outF.getvalue(), p.errF.getvalue()))
return d.addCallback(processEnded)
def test_unsetPid(self):
"""
Test if pid is None/non-None before/after process termination. This
reuses process_echoer.py to get a process that blocks on stdin.
"""
finished = defer.Deferred()
p = TrivialProcessProtocol(finished)
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_echoer.py")
procTrans = reactor.spawnProcess(p, exe,
[exe, scriptPath], env=None)
self.failUnless(procTrans.pid)
def afterProcessEnd(ignored):
self.assertEqual(procTrans.pid, None)
p.transport.closeStdin()
return finished.addCallback(afterProcessEnd)
def test_process(self):
"""
Test running a process: check its output, it exitCode, some property of
signalProcess.
"""
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_tester.py")
d = defer.Deferred()
p = TestProcessProtocol()
p.deferred = d
reactor.spawnProcess(p, exe, [exe, "-u", scriptPath], env=None)
def check(ignored):
self.assertEquals(p.stages, [1, 2, 3, 4, 5])
f = p.reason
f.trap(error.ProcessTerminated)
self.assertEquals(f.value.exitCode, 23)
# would .signal be available on non-posix?
# self.assertEquals(f.value.signal, None)
self.assertRaises(
error.ProcessExitedAlready, p.transport.signalProcess, 'INT')
try:
import process_tester, glob
for f in glob.glob(process_tester.test_file_match):
os.remove(f)
except:
pass
d.addCallback(check)
return d
def testManyProcesses(self):
def _check(results, protocols):
for p in protocols:
self.assertEquals(p.stages, [1, 2, 3, 4, 5], "[%d] stages = %s" % (id(p.transport), str(p.stages)))
# test status code
f = p.reason
f.trap(error.ProcessTerminated)
self.assertEquals(f.value.exitCode, 23)
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_tester.py")
args = [exe, "-u", scriptPath]
protocols = []
deferreds = []
for i in xrange(50):
p = TestManyProcessProtocol()
protocols.append(p)
reactor.spawnProcess(p, exe, args, env=None)
deferreds.append(p.deferred)
deferredList = defer.DeferredList(deferreds, consumeErrors=True)
deferredList.addCallback(_check, protocols)
return deferredList
def test_echo(self):
"""
A spawning a subprocess which echoes its stdin to its stdout via
C{reactor.spawnProcess} will result in that echoed output being
delivered to outReceived.
"""
finished = defer.Deferred()
p = EchoProtocol(finished)
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_echoer.py")
reactor.spawnProcess(p, exe, [exe, scriptPath], env=None)
def asserts(ignored):
self.failIf(p.failure, p.failure)
self.failUnless(hasattr(p, 'buffer'))
self.assertEquals(len(''.join(p.buffer)), len(p.s * p.n))
def takedownProcess(err):
p.transport.closeStdin()
return err
return finished.addCallback(asserts).addErrback(takedownProcess)
def testCommandLine(self):
args = [r'a\"b ', r'a\b ', r' a\\"b', r' a\\b', r'"foo bar" "', '\tab', '"\\', 'a"b', "a'b"]
pyExe = sys.executable
scriptPath = util.sibpath(__file__, "process_cmdline.py")
p = Accumulator()
d = p.endedDeferred = defer.Deferred()
reactor.spawnProcess(p, pyExe, [pyExe, "-u", scriptPath]+args, env=None,
path=None)
def processEnded(ign):
self.assertEquals(p.errF.getvalue(), "")
recvdArgs = p.outF.getvalue().splitlines()
self.assertEquals(recvdArgs, args)
return d.addCallback(processEnded)
def test_wrongArguments(self):
"""
Test invalid arguments to spawnProcess: arguments and environment
must only contains string or unicode, and not null bytes.
"""
exe = sys.executable
p = protocol.ProcessProtocol()
badEnvs = [
{"foo": 2},
{"foo": "egg\0a"},
{3: "bar"},
{"bar\0foo": "bar"}]
badArgs = [
[exe, 2],
"spam",
[exe, "foo\0bar"]]
# Sanity check - this will fail for people who have mucked with
# their site configuration in a stupid way, but there's nothing we
# can do about that.
badUnicode = u'\N{SNOWMAN}'
try:
badUnicode.encode(sys.getdefaultencoding())
except UnicodeEncodeError:
# Okay, that unicode doesn't encode, put it in as a bad environment
# key.
badEnvs.append({badUnicode: 'value for bad unicode key'})
badEnvs.append({'key for bad unicode value': badUnicode})
badArgs.append([exe, badUnicode])
else:
# It _did_ encode. Most likely, Gtk2 is being used and the
# default system encoding is UTF-8, which can encode anything.
# In any case, if implicit unicode -> str conversion works for
# that string, we can't test that TypeError gets raised instead,
# so just leave it off.
pass
for env in badEnvs:
self.assertRaises(
TypeError,
reactor.spawnProcess, p, exe, [exe, "-c", ""], env=env)
for args in badArgs:
self.assertRaises(
TypeError,
reactor.spawnProcess, p, exe, args, env=None)
# Use upper-case so that the environment key test uses an upper case
# name: some versions of Windows only support upper case environment
# variable names, and I think Python (as of 2.5) doesn't use the right
# syscall for lowercase or mixed case names to work anyway.
okayUnicode = u"UNICODE"
encodedValue = "UNICODE"
def _deprecatedUnicodeSupportTest(self, processProtocolClass, argv=[], env={}):
"""
Check that a deprecation warning is emitted when passing unicode to
spawnProcess for an argv value or an environment key or value.
Check that the warning is of the right type, has the right message,
and refers to the correct file. Unfortunately, don't check that the
line number is correct, because that is too hard for me to figure
out.
@param processProtocolClass: A L{UtilityProcessProtocol} subclass
which will be instantiated to communicate with the child process.
@param argv: The argv argument to spawnProcess.
@param env: The env argument to spawnProcess.
@return: A Deferred which fires when the test is complete.
"""
# Sanity to check to make sure we can actually encode this unicode
# with the default system encoding. This may be excessively
# paranoid. -exarkun
self.assertEqual(
self.okayUnicode.encode(sys.getdefaultencoding()),
self.encodedValue)
p = self.assertWarns(DeprecationWarning,
"Argument strings and environment keys/values passed to "
"reactor.spawnProcess should be str, not unicode.", __file__,
processProtocolClass.run, reactor, argv, env)
return p.getResult()
def test_deprecatedUnicodeArgvSupport(self):
"""
Test that a unicode string passed for an argument value is allowed
if it can be encoded with the default system encoding, but that a
deprecation warning is emitted.
"""
d = self._deprecatedUnicodeSupportTest(GetArgumentVector, argv=[self.okayUnicode])
def gotArgVector(argv):
self.assertEqual(argv, ['-c', self.encodedValue])
d.addCallback(gotArgVector)
return d
def test_deprecatedUnicodeEnvKeySupport(self):
"""
Test that a unicode string passed for the key of the environment
dictionary is allowed if it can be encoded with the default system
encoding, but that a deprecation warning is emitted.
"""
d = self._deprecatedUnicodeSupportTest(
GetEnvironmentDictionary, env={self.okayUnicode: self.encodedValue})
def gotEnvironment(environ):
self.assertEqual(environ[self.encodedValue], self.encodedValue)
d.addCallback(gotEnvironment)
return d
def test_deprecatedUnicodeEnvValueSupport(self):
"""
Test that a unicode string passed for the value of the environment
dictionary is allowed if it can be encoded with the default system
encoding, but that a deprecation warning is emitted.
"""
d = self._deprecatedUnicodeSupportTest(
GetEnvironmentDictionary, env={self.encodedValue: self.okayUnicode})
def gotEnvironment(environ):
# On Windows, the environment contains more things than we
# specified, so only make sure that at least the key we wanted
# is there, rather than testing the dictionary for exact
# equality.
self.assertEqual(environ[self.encodedValue], self.encodedValue)
d.addCallback(gotEnvironment)
return d
class TwoProcessProtocol(protocol.ProcessProtocol):
num = -1
finished = 0
def __init__(self):
self.deferred = defer.Deferred()
def outReceived(self, data):
pass
def processEnded(self, reason):
self.finished = 1
self.deferred.callback(None)
class TestTwoProcessesBase:
def setUp(self):
self.processes = [None, None]
self.pp = [None, None]
self.done = 0
self.verbose = 0
def createProcesses(self, usePTY=0):
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_reader.py")
for num in (0,1):
self.pp[num] = TwoProcessProtocol()
self.pp[num].num = num
p = reactor.spawnProcess(self.pp[num],
exe, [exe, "-u", scriptPath], env=None,
usePTY=usePTY)
self.processes[num] = p
def close(self, num):
if self.verbose: print "closing stdin [%d]" % num
p = self.processes[num]
pp = self.pp[num]
self.failIf(pp.finished, "Process finished too early")
p.loseConnection()
if self.verbose: print self.pp[0].finished, self.pp[1].finished
def _onClose(self):
return defer.gatherResults([ p.deferred for p in self.pp ])
def testClose(self):
if self.verbose: print "starting processes"
self.createProcesses()
reactor.callLater(1, self.close, 0)
reactor.callLater(2, self.close, 1)
return self._onClose()
class TestTwoProcessesNonPosix(TestTwoProcessesBase, unittest.TestCase):
pass
class TestTwoProcessesPosix(TestTwoProcessesBase, unittest.TestCase):
def tearDown(self):
for pp, pr in zip(self.pp, self.processes):
if not pp.finished:
try:
os.kill(pr.pid, signal.SIGTERM)
except OSError:
# If the test failed the process may already be dead
# The error here is only noise
pass
return self._onClose()
def kill(self, num):
if self.verbose: print "kill [%d] with SIGTERM" % num
p = self.processes[num]
pp = self.pp[num]
self.failIf(pp.finished, "Process finished too early")
os.kill(p.pid, signal.SIGTERM)
if self.verbose: print self.pp[0].finished, self.pp[1].finished
def testKill(self):
if self.verbose: print "starting processes"
self.createProcesses(usePTY=0)
reactor.callLater(1, self.kill, 0)
reactor.callLater(2, self.kill, 1)
return self._onClose()
def testClosePty(self):
if self.verbose: print "starting processes"
self.createProcesses(usePTY=1)
reactor.callLater(1, self.close, 0)
reactor.callLater(2, self.close, 1)
return self._onClose()
def testKillPty(self):
if self.verbose: print "starting processes"
self.createProcesses(usePTY=1)
reactor.callLater(1, self.kill, 0)
reactor.callLater(2, self.kill, 1)
return self._onClose()
class FDChecker(protocol.ProcessProtocol):
state = 0
data = ""
failed = None
def __init__(self, d):
self.deferred = d
def fail(self, why):
self.failed = why
self.deferred.callback(None)
def connectionMade(self):
self.transport.writeToChild(0, "abcd")
self.state = 1
def childDataReceived(self, childFD, data):
if self.state == 1:
if childFD != 1:
self.fail("read '%s' on fd %d (not 1) during state 1" \
% (childFD, data))
return
self.data += data
#print "len", len(self.data)
if len(self.data) == 6:
if self.data != "righto":
self.fail("got '%s' on fd1, expected 'righto'" \
% self.data)
return
self.data = ""
self.state = 2
#print "state2", self.state
self.transport.writeToChild(3, "efgh")
return
if self.state == 2:
self.fail("read '%s' on fd %s during state 2" % (childFD, data))
return
if self.state == 3:
if childFD != 1:
self.fail("read '%s' on fd %s (not 1) during state 3" \
% (childFD, data))
return
self.data += data
if len(self.data) == 6:
if self.data != "closed":
self.fail("got '%s' on fd1, expected 'closed'" \
% self.data)
return
self.state = 4
return
if self.state == 4:
self.fail("read '%s' on fd %s during state 4" % (childFD, data))
return
def childConnectionLost(self, childFD):
if self.state == 1:
self.fail("got connectionLost(%d) during state 1" % childFD)
return
if self.state == 2:
if childFD != 4:
self.fail("got connectionLost(%d) (not 4) during state 2" \
% childFD)
return
self.state = 3
self.transport.closeChildFD(5)
return
def processEnded(self, status):
rc = status.value.exitCode
if self.state != 4:
self.fail("processEnded early, rc %d" % rc)
return
if status.value.signal != None:
self.fail("processEnded with signal %s" % status.value.signal)
return
if rc != 0:
self.fail("processEnded with rc %d" % rc)
return
self.deferred.callback(None)
class FDTest(unittest.TestCase):
def testFD(self):
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_fds.py")
d = defer.Deferred()
p = FDChecker(d)
reactor.spawnProcess(p, exe, [exe, "-u", scriptPath], env=None,
path=None,
childFDs={0:"w", 1:"r", 2:2,
3:"w", 4:"r", 5:"w"})
d.addCallback(lambda x : self.failIf(p.failed, p.failed))
return d
def testLinger(self):
# See what happens when all the pipes close before the process
# actually stops. This test *requires* SIGCHLD catching to work,
# as there is no other way to find out the process is done.
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_linger.py")
p = Accumulator()
d = p.endedDeferred = defer.Deferred()
reactor.spawnProcess(p, exe, [exe, "-u", scriptPath], env=None,
path=None,
childFDs={1:"r", 2:2},
)
def processEnded(ign):
self.failUnlessEqual(p.outF.getvalue(),
"here is some text\ngoodbye\n")
return d.addCallback(processEnded)
class Accumulator(protocol.ProcessProtocol):
"""Accumulate data from a process."""
closed = 0
endedDeferred = None
def connectionMade(self):
self.outF = StringIO.StringIO()
self.errF = StringIO.StringIO()
def outReceived(self, d):
self.outF.write(d)
def errReceived(self, d):
self.errF.write(d)
def outConnectionLost(self):
pass
def errConnectionLost(self):
pass
def processEnded(self, reason):
self.closed = 1
if self.endedDeferred is not None:
d, self.endedDeferred = self.endedDeferred, None
d.callback(None)
class PosixProcessBase:
"""
Test running processes.
"""
usePTY = False
def getCommand(self, commandName):
"""
Return the path of the shell command named C{commandName}, looking at
common locations.
"""
if os.path.exists('/bin/%s' % (commandName,)):
cmd = '/bin/%s' % (commandName,)
elif os.path.exists('/usr/bin/%s' % (commandName,)):
cmd = '/usr/bin/%s' % (commandName,)
else:
raise RuntimeError(
"%s not found in /bin or /usr/bin" % (commandName,))
return cmd
def testNormalTermination(self):
cmd = self.getCommand('true')
d = defer.Deferred()
p = TrivialProcessProtocol(d)
reactor.spawnProcess(p, cmd, ['true'], env=None,
usePTY=self.usePTY)
def check(ignored):
p.reason.trap(error.ProcessDone)
self.assertEquals(p.reason.value.exitCode, 0)
self.assertEquals(p.reason.value.signal, None)
d.addCallback(check)
return d
def test_abnormalTermination(self):
"""
When a process terminates with a system exit code set to 1,
C{processEnded} is called with a L{error.ProcessTerminated} error,
the C{exitCode} attribute reflecting the system exit code.
"""
exe = sys.executable
d = defer.Deferred()
p = TrivialProcessProtocol(d)
reactor.spawnProcess(p, exe, [exe, '-c', 'import sys; sys.exit(1)'],
env=None, usePTY=self.usePTY)
def check(ignored):
p.reason.trap(error.ProcessTerminated)
self.assertEquals(p.reason.value.exitCode, 1)
self.assertEquals(p.reason.value.signal, None)
d.addCallback(check)
return d
def _testSignal(self, sig):
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_signal.py")
d = defer.Deferred()
p = SignalProtocol(d, sig)
reactor.spawnProcess(p, exe, [exe, "-u", scriptPath], env=None,
usePTY=self.usePTY)
return d
def test_signalHUP(self):
"""
Sending the SIGHUP signal to a running process interrupts it, and
C{processEnded} is called with a L{error.ProcessTerminated} instance
with the C{exitCode} set to C{None} and the C{signal} attribute set to
C{signal.SIGHUP}. C{os.WTERMSIG} can also be used on the C{status}
attribute to extract the signal value.
"""
return self._testSignal('HUP')
def test_signalINT(self):
"""
Sending the SIGINT signal to a running process interrupts it, and
C{processEnded} is called with a L{error.ProcessTerminated} instance
with the C{exitCode} set to C{None} and the C{signal} attribute set to
C{signal.SIGINT}. C{os.WTERMSIG} can also be used on the C{status}
attribute to extract the signal value.
"""
return self._testSignal('INT')
def test_signalKILL(self):
"""
Sending the SIGKILL signal to a running process interrupts it, and
C{processEnded} is called with a L{error.ProcessTerminated} instance
with the C{exitCode} set to C{None} and the C{signal} attribute set to
C{signal.SIGKILL}. C{os.WTERMSIG} can also be used on the C{status}
attribute to extract the signal value.
"""
return self._testSignal('KILL')
def test_signalTERM(self):
"""
Sending the SIGTERM signal to a running process interrupts it, and
C{processEnded} is called with a L{error.ProcessTerminated} instance
with the C{exitCode} set to C{None} and the C{signal} attribute set to
C{signal.SIGTERM}. C{os.WTERMSIG} can also be used on the C{status}
attribute to extract the signal value.
"""
return self._testSignal('TERM')
def test_childSignalHandling(self):
"""
The disposition of signals which are ignored in the parent
process is reset to the default behavior for the child
process.
"""
# Somewhat arbitrarily select SIGUSR1 here. It satisfies our
# requirements that:
# - The interpreter not fiddle around with the handler
# behind our backs at startup time (this disqualifies
# signals like SIGINT and SIGPIPE).
# - The default behavior is to exit.
#
# This lets us send the signal to the child and then verify
# that it exits with a status code indicating that it was
# indeed the signal which caused it to exit.
which = signal.SIGUSR1
# Ignore the signal in the parent (and make sure we clean it
# up).
handler = signal.signal(which, signal.SIG_IGN)
self.addCleanup(signal.signal, signal.SIGUSR1, handler)
# Now do the test.
return self._testSignal(signal.SIGUSR1)
def test_executionError(self):
"""
Raise an error during execvpe to check error management.
"""
cmd = self.getCommand('false')
d = defer.Deferred()
p = TrivialProcessProtocol(d)
def buggyexecvpe(command, args, environment):
raise RuntimeError("Ouch")
oldexecvpe = os.execvpe
os.execvpe = buggyexecvpe
try:
reactor.spawnProcess(p, cmd, ['false'], env=None,
usePTY=self.usePTY)
def check(ignored):
errData = "".join(p.errData + p.outData)
self.assertIn("Upon execvpe", errData)
self.assertIn("Ouch", errData)
d.addCallback(check)
finally:
os.execvpe = oldexecvpe
return d
def test_errorInProcessEnded(self):
"""
The handler which reaps a process is removed when the process is
reaped, even if the protocol's C{processEnded} method raises an
exception.
"""
connected = defer.Deferred()
ended = defer.Deferred()
# This script runs until we disconnect its transport.
pythonExecutable = sys.executable
scriptPath = util.sibpath(__file__, "process_twisted.py")
class ErrorInProcessEnded(protocol.ProcessProtocol):
"""
A protocol that raises an error in C{processEnded}.
"""
def makeConnection(self, transport):
connected.callback(transport)
def processEnded(self, reason):
reactor.callLater(0, ended.callback, None)
raise RuntimeError("Deliberate error")
# Launch the process.
reactor.spawnProcess(
ErrorInProcessEnded(), pythonExecutable,
[pythonExecutable, scriptPath],
env=None, path=None)
pid = []
def cbConnected(transport):
pid.append(transport.pid)
# There's now a reap process handler registered.
self.assertIn(transport.pid, process.reapProcessHandlers)
# Kill the process cleanly, triggering an error in the protocol.
transport.loseConnection()
connected.addCallback(cbConnected)
def checkTerminated(ignored):
# The exception was logged.
excs = self.flushLoggedErrors(RuntimeError)
self.assertEqual(len(excs), 1)
# The process is no longer scheduled for reaping.
self.assertNotIn(pid[0], process.reapProcessHandlers)
ended.addCallback(checkTerminated)
return ended
class MockSignal(object):
"""
Neuter L{signal.signal}, but pass other attributes unscathed
"""
def signal(self, sig, action):
return signal.getsignal(sig)
def __getattr__(self, attr):
return getattr(signal, attr)
class MockOS(object):
"""
The mock OS: overwrite L{os}, L{fcntl} and {sys} functions with fake ones.
@ivar exited: set to True when C{_exit} is called.
@type exited: C{bool}
@ivar O_RDWR: dumb value faking C{os.O_RDWR}.
@type O_RDWR: C{int}
@ivar O_NOCTTY: dumb value faking C{os.O_NOCTTY}.
@type O_NOCTTY: C{int}
@ivar WNOHANG: dumb value faking C{os.WNOHANG}.
@type WNOHANG: C{int}
@ivar raiseFork: if not C{None}, subsequent calls to fork will raise this
object.
@type raiseFork: C{NoneType} or C{Exception}
@ivar raiseExec: if set, subsequent calls to execvpe will raise an error.
@type raiseExec: C{bool}
@ivar fdio: fake file object returned by calls to fdopen.
@type fdio: C{StringIO.StringIO}
@ivar actions: hold names of some actions executed by the object, in order
of execution.
@type actions: C{list} of C{str}
@ivar closed: keep track of the file descriptor closed.
@param closed: C{list} of C{int}
@ivar child: whether fork return for the child or the parent.
@type child: C{bool}
@ivar pipeCount: count the number of time that C{os.pipe} has been called.
@type pipeCount: C{int}
@ivar raiseWaitPid: if set, subsequent calls to waitpid will raise an
the error specified.
@type raiseWaitPid: C{None} or a class
@ivar waitChild: if set, subsequent calls to waitpid will return it.
@type waitChild: C{None} or a tuple
@ivar euid: the uid returned by the fake C{os.geteuid}
@type euid: C{int}
@ivar egid: the gid returned by the fake C{os.getegid}
@type egid: C{int}
@ivar seteuidCalls: stored results of C{os.seteuid} calls.
@type seteuidCalls: C{list}
@ivar setegidCalls: stored results of C{os.setegid} calls.
@type setegidCalls: C{list}
@ivar path: the path returned by C{os.path.expanduser}.
@type path: C{str}
"""
exited = False
raiseExec = False
fdio = None
child = True
raiseWaitPid = None
raiseFork = None
waitChild = None
euid = 0
egid = 0
path = None
def __init__(self):
"""
Initialize data structures.
"""
self.actions = []
self.closed = []
self.pipeCount = 0
self.O_RDWR = -1
self.O_NOCTTY = -2
self.WNOHANG = -4
self.WEXITSTATUS = lambda x: 0
self.WIFEXITED = lambda x: 1
self.seteuidCalls = []
self.setegidCalls = []
def open(self, dev, flags):
"""
Fake C{os.open}. Return a non fd number to be sure it's not used
elsewhere.
"""
return -3
def fstat(self, fd):
"""
Fake C{os.fstat}. Return a C{os.stat_result} filled with garbage.
"""
return os.stat_result((0,) * 10)
def fdopen(self, fd, flag):
"""
Fake C{os.fdopen}. Return a StringIO object whose content can be tested
later via C{self.fdio}.
"""
self.fdio = StringIO.StringIO()
return self.fdio
def setsid(self):
"""
Fake C{os.setsid}. Do nothing.
"""
def fork(self):
"""
Fake C{os.fork}. Save the action in C{self.actions}, and return 0 if
C{self.child} is set, or a dumb number.
"""
self.actions.append(('fork', gc.isenabled()))
if self.raiseFork is not None:
raise self.raiseFork
elif self.child:
# Child result is 0
return 0
else:
return 21
def close(self, fd):
"""
Fake C{os.close}, saving the closed fd in C{self.closed}.
"""
self.closed.append(fd)
def dup2(self, fd1, fd2):
"""
Fake C{os.dup2}. Do nothing.
"""
def write(self, fd, data):
"""
Fake C{os.write}. Do nothing.
"""
def execvpe(self, command, args, env):
"""
Fake C{os.execvpe}. Save the action, and raise an error if
C{self.raiseExec} is set.
"""
self.actions.append('exec')
if self.raiseExec:
raise RuntimeError("Bar")
def pipe(self):
"""
Fake C{os.pipe}. Return non fd numbers to be sure it's not used
elsewhere, and increment C{self.pipeCount}. This is used to uniquify
the result.
"""
self.pipeCount += 1
return - 2 * self.pipeCount + 1, - 2 * self.pipeCount
def ttyname(self, fd):
"""
Fake C{os.ttyname}. Return a dumb string.
"""
return "foo"
def _exit(self, code):
"""
Fake C{os._exit}. Save the action, set the C{self.exited} flag, and
raise C{SystemError}.
"""
self.actions.append('exit')
self.exited = True
# Don't forget to raise an error, or you'll end up in parent
# code path.
raise SystemError()
def ioctl(self, fd, flags, arg):
"""
Override C{fcntl.ioctl}. Do nothing.
"""
def setNonBlocking(self, fd):
"""
Override C{fdesc.setNonBlocking}. Do nothing.
"""
def waitpid(self, pid, options):
"""
Override C{os.waitpid}. Return values meaning that the child process
has exited, save executed action.
"""
self.actions.append('waitpid')
if self.raiseWaitPid is not None:
raise self.raiseWaitPid
if self.waitChild is not None:
return self.waitChild
return 1, 0
def settrace(self, arg):
"""
Override C{sys.settrace} to keep coverage working.
"""
def getgid(self):
"""
Override C{os.getgid}. Return a dumb number.
"""
return 1235
def getuid(self):
"""
Override C{os.getuid}. Return a dumb number.
"""
return 1237
def setuid(self, val):
"""
Override C{os.setuid}. Do nothing.
"""
self.actions.append(('setuid', val))
def setgid(self, val):
"""
Override C{os.setgid}. Do nothing.
"""
self.actions.append(('setgid', val))
def setregid(self, val1, val2):
"""
Override C{os.setregid}. Do nothing.
"""
self.actions.append(('setregid', val1, val2))
def setreuid(self, val1, val2):
"""
Override C{os.setreuid}. Save the action.
"""
self.actions.append(('setreuid', val1, val2))
def switchUID(self, uid, gid):
"""
Override C{util.switchuid}. Save the action.
"""
self.actions.append(('switchuid', uid, gid))
def openpty(self):
"""
Override C{pty.openpty}, returning fake file descriptors.
"""
return -12, -13
def geteuid(self):
"""
Mock C{os.geteuid}, returning C{self.euid} instead.
"""
return self.euid
def getegid(self):
"""
Mock C{os.getegid}, returning C{self.egid} instead.
"""
return self.egid
def seteuid(self, egid):
"""
Mock C{os.seteuid}, store result.
"""
self.seteuidCalls.append(egid)
def setegid(self, egid):
"""
Mock C{os.setegid}, store result.
"""
self.setegidCalls.append(egid)
def expanduser(self, path):
"""
Mock C{os.path.expanduser}.
"""
return self.path
def getpwnam(self, user):
"""
Mock C{pwd.getpwnam}.
"""
return 0, 0, 1, 2
if process is not None:
class DumbProcessWriter(process.ProcessWriter):
"""
A fake L{process.ProcessWriter} used for tests.
"""
def startReading(self):
"""
Here's the faking: don't do anything here.
"""
class DumbProcessReader(process.ProcessReader):
"""
A fake L{process.ProcessReader} used for tests.
"""
def startReading(self):
"""
Here's the faking: don't do anything here.
"""
class DumbPTYProcess(process.PTYProcess):
"""
A fake L{process.PTYProcess} used for tests.
"""
def startReading(self):
"""
Here's the faking: don't do anything here.
"""
class MockProcessTestCase(unittest.TestCase):
"""
Mock a process runner to test forked child code path.
"""
if process is None:
skip = "twisted.internet.process is never used on Windows"
def setUp(self):
"""
Replace L{process} os, fcntl, sys, switchUID, fdesc and pty modules
with the mock class L{MockOS}.
"""
if gc.isenabled():
self.addCleanup(gc.enable)
else:
self.addCleanup(gc.disable)
self.mockos = MockOS()
self.mockos.euid = 1236
self.mockos.egid = 1234
self.patch(process, "os", self.mockos)
self.patch(process, "fcntl", self.mockos)
self.patch(process, "sys", self.mockos)
self.patch(process, "switchUID", self.mockos.switchUID)
self.patch(process, "fdesc", self.mockos)
self.patch(process.Process, "processReaderFactory", DumbProcessReader)
self.patch(process.Process, "processWriterFactory", DumbProcessWriter)
self.patch(process, "pty", self.mockos)
self.mocksig = MockSignal()
self.patch(process, "signal", self.mocksig)
def tearDown(self):
"""
Reset processes registered for reap.
"""
process.reapProcessHandlers = {}
def test_mockFork(self):
"""
Test a classic spawnProcess. Check the path of the client code:
fork, exec, exit.
"""
gc.enable()
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
try:
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=False)
except SystemError:
self.assert_(self.mockos.exited)
self.assertEquals(
self.mockos.actions, [("fork", False), "exec", "exit"])
else:
self.fail("Should not be here")
# It should leave the garbage collector disabled.
self.assertFalse(gc.isenabled())
def _mockForkInParentTest(self):
"""
Assert that in the main process, spawnProcess disables the garbage
collector, calls fork, closes the pipe file descriptors it created for
the child process, and calls waitpid.
"""
self.mockos.child = False
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=False)
# It should close the first read pipe, and the 2 last write pipes
self.assertEqual(set(self.mockos.closed), set([-1, -4, -6]))
self.assertEquals(self.mockos.actions, [("fork", False), "waitpid"])
def test_mockForkInParentGarbageCollectorEnabled(self):
"""
The garbage collector should be enabled when L{reactor.spawnProcess}
returns if it was initially enabled.
@see L{_mockForkInParentTest}
"""
gc.enable()
self._mockForkInParentTest()
self.assertTrue(gc.isenabled())
def test_mockForkInParentGarbageCollectorDisabled(self):
"""
The garbage collector should be disabled when L{reactor.spawnProcess}
returns if it was initially disabled.
@see L{_mockForkInParentTest}
"""
gc.disable()
self._mockForkInParentTest()
self.assertFalse(gc.isenabled())
def test_mockForkTTY(self):
"""
Test a TTY spawnProcess: check the path of the client code:
fork, exec, exit.
"""
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
try:
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=True)
except SystemError:
self.assert_(self.mockos.exited)
self.assertEquals(
self.mockos.actions, [("fork", False), "exec", "exit"])
else:
self.fail("Should not be here")
def _mockWithForkError(self):
"""
Assert that if the fork call fails, no other process setup calls are
made and that spawnProcess raises the exception fork raised.
"""
self.mockos.raiseFork = OSError(errno.EAGAIN, None)
protocol = TrivialProcessProtocol(None)
self.assertRaises(OSError, reactor.spawnProcess, protocol, None)
self.assertEqual(self.mockos.actions, [("fork", False)])
def test_mockWithForkErrorGarbageCollectorEnabled(self):
"""
The garbage collector should be enabled when L{reactor.spawnProcess}
raises because L{os.fork} raised, if it was initially enabled.
"""
gc.enable()
self._mockWithForkError()
self.assertTrue(gc.isenabled())
def test_mockWithForkErrorGarbageCollectorDisabled(self):
"""
The garbage collector should be disabled when
L{reactor.spawnProcess} raises because L{os.fork} raised, if it was
initially disabled.
"""
gc.disable()
self._mockWithForkError()
self.assertFalse(gc.isenabled())
def test_mockForkErrorCloseFDs(self):
"""
When C{os.fork} raises an exception, the file descriptors created
before are closed and don't leak.
"""
self._mockWithForkError()
self.assertEqual(set(self.mockos.closed), set([-1, -4, -6, -2, -3, -5]))
def test_mockForkErrorGivenFDs(self):
"""
When C{os.forks} raises an exception and that file descriptors have
been specified with the C{childFDs} arguments of
L{reactor.spawnProcess}, they are not closed.
"""
self.mockos.raiseFork = OSError(errno.EAGAIN, None)
protocol = TrivialProcessProtocol(None)
self.assertRaises(OSError, reactor.spawnProcess, protocol, None,
childFDs={0: -10, 1: -11, 2: -13})
self.assertEqual(self.mockos.actions, [("fork", False)])
self.assertEqual(self.mockos.closed, [])
# We can also put "r" or "w" to let twisted create the pipes
self.assertRaises(OSError, reactor.spawnProcess, protocol, None,
childFDs={0: "r", 1: -11, 2: -13})
self.assertEqual(set(self.mockos.closed), set([-1, -2]))
def test_mockForkErrorClosePTY(self):
"""
When C{os.fork} raises an exception, the file descriptors created by
C{pty.openpty} are closed and don't leak, when C{usePTY} is set to
C{True}.
"""
self.mockos.raiseFork = OSError(errno.EAGAIN, None)
protocol = TrivialProcessProtocol(None)
self.assertRaises(OSError, reactor.spawnProcess, protocol, None,
usePTY=True)
self.assertEqual(self.mockos.actions, [("fork", False)])
self.assertEqual(set(self.mockos.closed), set([-12, -13]))
def test_mockForkErrorPTYGivenFDs(self):
"""
If a tuple is passed to C{usePTY} to specify slave and master file
descriptors and that C{os.fork} raises an exception, these file
descriptors aren't closed.
"""
self.mockos.raiseFork = OSError(errno.EAGAIN, None)
protocol = TrivialProcessProtocol(None)
self.assertRaises(OSError, reactor.spawnProcess, protocol, None,
usePTY=(-20, -21, 'foo'))
self.assertEqual(self.mockos.actions, [("fork", False)])
self.assertEqual(self.mockos.closed, [])
def test_mockWithExecError(self):
"""
Spawn a process but simulate an error during execution in the client
path: C{os.execvpe} raises an error. It should close all the standard
fds, try to print the error encountered, and exit cleanly.
"""
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
self.mockos.raiseExec = True
try:
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=False)
except SystemError:
self.assert_(self.mockos.exited)
self.assertEquals(
self.mockos.actions, [("fork", False), "exec", "exit"])
# Check that fd have been closed
self.assertIn(0, self.mockos.closed)
self.assertIn(1, self.mockos.closed)
self.assertIn(2, self.mockos.closed)
# Check content of traceback
self.assertIn("RuntimeError: Bar", self.mockos.fdio.getvalue())
else:
self.fail("Should not be here")
def test_mockSetUid(self):
"""
Try creating a process with setting its uid: it's almost the same path
as the standard path, but with a C{switchUID} call before the exec.
"""
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
try:
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=False, uid=8080)
except SystemError:
self.assert_(self.mockos.exited)
self.assertEquals(self.mockos.actions,
[('setuid', 0), ('setgid', 0), ('fork', False),
('switchuid', 8080, 1234), 'exec', 'exit'])
else:
self.fail("Should not be here")
def test_mockSetUidInParent(self):
"""
Try creating a process with setting its uid, in the parent path: it
should switch to root before fork, then restore initial uid/gids.
"""
self.mockos.child = False
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=False, uid=8080)
self.assertEquals(self.mockos.actions,
[('setuid', 0), ('setgid', 0), ('fork', False),
('setregid', 1235, 1234), ('setreuid', 1237, 1236), 'waitpid'])
def test_mockPTYSetUid(self):
"""
Try creating a PTY process with setting its uid: it's almost the same
path as the standard path, but with a C{switchUID} call before the
exec.
"""
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
try:
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=True, uid=8081)
except SystemError:
self.assert_(self.mockos.exited)
self.assertEquals(self.mockos.actions,
[('setuid', 0), ('setgid', 0), ('fork', False),
('switchuid', 8081, 1234), 'exec', 'exit'])
else:
self.fail("Should not be here")
def test_mockPTYSetUidInParent(self):
"""
Try creating a PTY process with setting its uid, in the parent path: it
should switch to root before fork, then restore initial uid/gids.
"""
self.mockos.child = False
cmd = '/mock/ouch'
d = defer.Deferred()
p = TrivialProcessProtocol(d)
oldPTYProcess = process.PTYProcess
try:
process.PTYProcess = DumbPTYProcess
reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=True, uid=8080)
finally:
process.PTYProcess = oldPTYProcess
self.assertEquals(self.mockos.actions,
[('setuid', 0), ('setgid', 0), ('fork', False),
('setregid', 1235, 1234), ('setreuid', 1237, 1236), 'waitpid'])
def test_mockWithWaitError(self):
"""
Test that reapProcess logs errors raised.
"""
self.mockos.child = False
cmd = '/mock/ouch'
self.mockos.waitChild = (0, 0)
d = defer.Deferred()
p = TrivialProcessProtocol(d)
proc = reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=False)
self.assertEquals(self.mockos.actions, [("fork", False), "waitpid"])
self.mockos.raiseWaitPid = OSError()
proc.reapProcess()
errors = self.flushLoggedErrors()
self.assertEquals(len(errors), 1)
errors[0].trap(OSError)
def test_mockErrorECHILDInReapProcess(self):
"""
Test that reapProcess doesn't log anything when waitpid raises a
C{OSError} with errno C{ECHILD}.
"""
self.mockos.child = False
cmd = '/mock/ouch'
self.mockos.waitChild = (0, 0)
d = defer.Deferred()
p = TrivialProcessProtocol(d)
proc = reactor.spawnProcess(p, cmd, ['ouch'], env=None,
usePTY=False)
self.assertEquals(self.mockos.actions, [("fork", False), "waitpid"])
self.mockos.raiseWaitPid = OSError()
self.mockos.raiseWaitPid.errno = errno.ECHILD
# This should not produce any errors
proc.reapProcess()
def test_mockErrorInPipe(self):
"""
If C{os.pipe} raises an exception after some pipes where created, the
created pipes are closed and don't leak.
"""
pipes = [-1, -2, -3, -4]
def pipe():
try:
return pipes.pop(0), pipes.pop(0)
except IndexError:
raise OSError()
self.mockos.pipe = pipe
protocol = TrivialProcessProtocol(None)
self.assertRaises(OSError, reactor.spawnProcess, protocol, None)
self.assertEqual(self.mockos.actions, [])
self.assertEqual(set(self.mockos.closed), set([-4, -3, -2, -1]))
def test_mockErrorInForkRestoreUID(self):
"""
If C{os.fork} raises an exception and a UID change has been made, the
previous UID and GID are restored.
"""
self.mockos.raiseFork = OSError(errno.EAGAIN, None)
protocol = TrivialProcessProtocol(None)
self.assertRaises(OSError, reactor.spawnProcess, protocol, None,
uid=8080)
self.assertEqual(self.mockos.actions,
[('setuid', 0), ('setgid', 0), ("fork", False),
('setregid', 1235, 1234), ('setreuid', 1237, 1236)])
class PosixProcessTestCase(unittest.TestCase, PosixProcessBase):
# add two non-pty test cases
def test_stderr(self):
"""
Bytes written to stderr by the spawned process are passed to the
C{errReceived} callback on the C{ProcessProtocol} passed to
C{spawnProcess}.
"""
cmd = sys.executable
value = "42"
p = Accumulator()
d = p.endedDeferred = defer.Deferred()
reactor.spawnProcess(p, cmd,
[cmd, "-c",
"import sys; sys.stderr.write('%s')" % (value,)],
env=None, path="/tmp",
usePTY=self.usePTY)
def processEnded(ign):
self.assertEquals(value, p.errF.getvalue())
return d.addCallback(processEnded)
def testProcess(self):
cmd = self.getCommand('gzip')
s = "there's no place like home!\n" * 3
p = Accumulator()
d = p.endedDeferred = defer.Deferred()
reactor.spawnProcess(p, cmd, [cmd, "-c"], env=None, path="/tmp",
usePTY=self.usePTY)
p.transport.write(s)
p.transport.closeStdin()
def processEnded(ign):
f = p.outF
f.seek(0, 0)
gf = gzip.GzipFile(fileobj=f)
self.assertEquals(gf.read(), s)
return d.addCallback(processEnded)
class PosixProcessTestCasePTY(unittest.TestCase, PosixProcessBase):
"""
Just like PosixProcessTestCase, but use ptys instead of pipes.
"""
usePTY = True
# PTYs only offer one input and one output. What still makes sense?
# testNormalTermination
# test_abnormalTermination
# testSignal
# testProcess, but not without p.transport.closeStdin
# might be solveable: TODO: add test if so
def testOpeningTTY(self):
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_tty.py")
p = Accumulator()
d = p.endedDeferred = defer.Deferred()
reactor.spawnProcess(p, exe, [exe, "-u", scriptPath], env=None,
path=None, usePTY=self.usePTY)
p.transport.write("hello world!\n")
def processEnded(ign):
self.assertRaises(
error.ProcessExitedAlready, p.transport.signalProcess, 'HUP')
self.assertEquals(
p.outF.getvalue(),
"hello world!\r\nhello world!\r\n",
"Error message from process_tty follows:\n\n%s\n\n" % p.outF.getvalue())
return d.addCallback(processEnded)
def testBadArgs(self):
pyExe = sys.executable
pyArgs = [pyExe, "-u", "-c", "print 'hello'"]
p = Accumulator()
self.assertRaises(ValueError, reactor.spawnProcess, p, pyExe, pyArgs,
usePTY=1, childFDs={1:'r'})
class Win32SignalProtocol(SignalProtocol):
"""
A win32-specific process protocol that handles C{processEnded}
differently: processes should exit with exit code 1.
"""
def processEnded(self, reason):
"""
Callback C{self.deferred} with C{None} if C{reason} is a
L{error.ProcessTerminated} failure with C{exitCode} set to 1.
Otherwise, errback with a C{ValueError} describing the problem.
"""
if not reason.check(error.ProcessTerminated):
return self.deferred.errback(
ValueError("wrong termination: %s" % (reason,)))
v = reason.value
if v.exitCode != 1:
return self.deferred.errback(
ValueError("Wrong exit code: %s" % (reason.exitCode,)))
self.deferred.callback(None)
class Win32ProcessTestCase(unittest.TestCase):
"""
Test process programs that are packaged with twisted.
"""
def testStdinReader(self):
pyExe = sys.executable
scriptPath = util.sibpath(__file__, "process_stdinreader.py")
p = Accumulator()
d = p.endedDeferred = defer.Deferred()
reactor.spawnProcess(p, pyExe, [pyExe, "-u", scriptPath], env=None,
path=None)
p.transport.write("hello, world")
p.transport.closeStdin()
def processEnded(ign):
self.assertEquals(p.errF.getvalue(), "err\nerr\n")
self.assertEquals(p.outF.getvalue(), "out\nhello, world\nout\n")
return d.addCallback(processEnded)
def testBadArgs(self):
pyExe = sys.executable
pyArgs = [pyExe, "-u", "-c", "print 'hello'"]
p = Accumulator()
self.assertRaises(ValueError,
reactor.spawnProcess, p, pyExe, pyArgs, uid=1)
self.assertRaises(ValueError,
reactor.spawnProcess, p, pyExe, pyArgs, gid=1)
self.assertRaises(ValueError,
reactor.spawnProcess, p, pyExe, pyArgs, usePTY=1)
self.assertRaises(ValueError,
reactor.spawnProcess, p, pyExe, pyArgs, childFDs={1:'r'})
def _testSignal(self, sig):
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_signal.py")
d = defer.Deferred()
p = Win32SignalProtocol(d, sig)
reactor.spawnProcess(p, exe, [exe, "-u", scriptPath], env=None)
return d
def test_signalTERM(self):
"""
Sending the SIGTERM signal terminates a created process, and
C{processEnded} is called with a L{error.ProcessTerminated} instance
with the C{exitCode} attribute set to 1.
"""
return self._testSignal('TERM')
def test_signalINT(self):
"""
Sending the SIGINT signal terminates a created process, and
C{processEnded} is called with a L{error.ProcessTerminated} instance
with the C{exitCode} attribute set to 1.
"""
return self._testSignal('INT')
def test_signalKILL(self):
"""
Sending the SIGKILL signal terminates a created process, and
C{processEnded} is called with a L{error.ProcessTerminated} instance
with the C{exitCode} attribute set to 1.
"""
return self._testSignal('KILL')
def test_closeHandles(self):
"""
The win32 handles should be properly closed when the process exits.
"""
import win32api
connected = defer.Deferred()
ended = defer.Deferred()
class SimpleProtocol(protocol.ProcessProtocol):
"""
A protocol that fires deferreds when connected and disconnected.
"""
def makeConnection(self, transport):
connected.callback(transport)
def processEnded(self, reason):
ended.callback(None)
p = SimpleProtocol()
pyExe = sys.executable
pyArgs = [pyExe, "-u", "-c", "print 'hello'"]
proc = reactor.spawnProcess(p, pyExe, pyArgs)
def cbConnected(transport):
self.assertIdentical(transport, proc)
# perform a basic validity test on the handles
win32api.GetHandleInformation(proc.hProcess)
win32api.GetHandleInformation(proc.hThread)
# And save their values for later
self.hProcess = proc.hProcess
self.hThread = proc.hThread
connected.addCallback(cbConnected)
def checkTerminated(ignored):
# The attributes on the process object must be reset...
self.assertIdentical(proc.pid, None)
self.assertIdentical(proc.hProcess, None)
self.assertIdentical(proc.hThread, None)
# ...and the handles must be closed.
self.assertRaises(win32api.error,
win32api.GetHandleInformation, self.hProcess)
self.assertRaises(win32api.error,
win32api.GetHandleInformation, self.hThread)
ended.addCallback(checkTerminated)
return defer.gatherResults([connected, ended])
class Dumbwin32procPidTest(unittest.TestCase):
"""
Simple test for the pid attribute of Process on win32.
"""
def test_pid(self):
"""
Launch process with mock win32process. The only mock aspect of this
module is that the pid of the process created will always be 42.
"""
from twisted.internet import _dumbwin32proc
from twisted.test import mock_win32process
self.patch(_dumbwin32proc, "win32process", mock_win32process)
exe = sys.executable
scriptPath = util.sibpath(__file__, "process_cmdline.py")
d = defer.Deferred()
processProto = TrivialProcessProtocol(d)
comspec = str(os.environ["COMSPEC"])
cmd = [comspec, "/c", exe, scriptPath]
p = _dumbwin32proc.Process(reactor,
processProto,
None,
cmd,
{},
None)
self.assertEquals(42, p.pid)
self.assertEquals("<Process pid=42>", repr(p))
def pidCompleteCb(result):
self.assertEquals(None, p.pid)
return d.addCallback(pidCompleteCb)
class UtilTestCase(unittest.TestCase):
"""
Tests for process-related helper functions (currently only
L{procutils.which}.
"""
def setUp(self):
"""
Create several directories and files, some of which are executable
and some of which are not. Save the current PATH setting.
"""
j = os.path.join
base = self.mktemp()
self.foo = j(base, "foo")
self.baz = j(base, "baz")
self.foobar = j(self.foo, "bar")
self.foobaz = j(self.foo, "baz")
self.bazfoo = j(self.baz, "foo")
self.bazbar = j(self.baz, "bar")
for d in self.foobar, self.foobaz, self.bazfoo, self.bazbar:
os.makedirs(d)
for name, mode in [(j(self.foobaz, "executable"), 0700),
(j(self.foo, "executable"), 0700),
(j(self.bazfoo, "executable"), 0700),
(j(self.bazfoo, "executable.bin"), 0700),
(j(self.bazbar, "executable"), 0)]:
f = file(name, "w")
f.close()
os.chmod(name, mode)
self.oldPath = os.environ.get('PATH', None)
os.environ['PATH'] = os.pathsep.join((
self.foobar, self.foobaz, self.bazfoo, self.bazbar))
def tearDown(self):
"""
Restore the saved PATH setting, and set all created files readable
again so that they can be deleted easily.
"""
os.chmod(os.path.join(self.bazbar, "executable"), stat.S_IWUSR)
if self.oldPath is None:
try:
del os.environ['PATH']
except KeyError:
pass
else:
os.environ['PATH'] = self.oldPath
def test_whichWithoutPATH(self):
"""
Test that if C{os.environ} does not have a C{'PATH'} key,
L{procutils.which} returns an empty list.
"""
del os.environ['PATH']
self.assertEqual(procutils.which("executable"), [])
def testWhich(self):
j = os.path.join
paths = procutils.which("executable")
expectedPaths = [j(self.foobaz, "executable"),
j(self.bazfoo, "executable")]
if runtime.platform.isWindows():
expectedPaths.append(j(self.bazbar, "executable"))
self.assertEquals(paths, expectedPaths)
def testWhichPathExt(self):
j = os.path.join
old = os.environ.get('PATHEXT', None)
os.environ['PATHEXT'] = os.pathsep.join(('.bin', '.exe', '.sh'))
try:
paths = procutils.which("executable")
finally:
if old is None:
del os.environ['PATHEXT']
else:
os.environ['PATHEXT'] = old
expectedPaths = [j(self.foobaz, "executable"),
j(self.bazfoo, "executable"),
j(self.bazfoo, "executable.bin")]
if runtime.platform.isWindows():
expectedPaths.append(j(self.bazbar, "executable"))
self.assertEquals(paths, expectedPaths)
class ClosingPipesProcessProtocol(protocol.ProcessProtocol):
output = ''
errput = ''
def __init__(self, outOrErr):
self.deferred = defer.Deferred()
self.outOrErr = outOrErr
def processEnded(self, reason):
self.deferred.callback(reason)
def outReceived(self, data):
self.output += data
def errReceived(self, data):
self.errput += data
class ClosingPipes(unittest.TestCase):
def doit(self, fd):
p = ClosingPipesProcessProtocol(True)
p.deferred.addCallbacks(
callback=lambda _: self.fail("I wanted an errback."),
errback=self._endProcess, errbackArgs=(p,))
reactor.spawnProcess(p, sys.executable,
[sys.executable, '-u', '-c',
r'raw_input(); import sys, os; os.write(%d, "foo\n"); sys.exit(42)' % fd],
env=None)
p.transport.write('go\n')
if fd == 1:
p.transport.closeStdout()
elif fd == 2:
p.transport.closeStderr()
else:
raise RuntimeError
# make the buggy case not hang
p.transport.closeStdin()
return p.deferred
def _endProcess(self, reason, p):
self.failIf(reason.check(error.ProcessDone),
'Child should fail due to EPIPE.')
reason.trap(error.ProcessTerminated)
# child must not get past that write without raising
self.failIfEqual(reason.value.exitCode, 42,
'process reason was %r' % reason)
self.failUnlessEqual(p.output, '')
return p.errput
def test_stdout(self):
"""ProcessProtocol.transport.closeStdout actually closes the pipe."""
d = self.doit(1)
def _check(errput):
self.failIfEqual(errput.find('OSError'), -1)
if runtime.platform.getType() != 'win32':
self.failIfEqual(errput.find('Broken pipe'), -1)
d.addCallback(_check)
return d
def test_stderr(self):
"""ProcessProtocol.transport.closeStderr actually closes the pipe."""
d = self.doit(2)
def _check(errput):
# there should be no stderr open, so nothing for it to
# write the error to.
self.failUnlessEqual(errput, '')
d.addCallback(_check)
return d
skipMessage = "wrong platform or reactor doesn't support IReactorProcess"
if (runtime.platform.getType() != 'posix') or (not interfaces.IReactorProcess(reactor, None)):
PosixProcessTestCase.skip = skipMessage
PosixProcessTestCasePTY.skip = skipMessage
TestTwoProcessesPosix.skip = skipMessage
FDTest.skip = skipMessage
if (runtime.platform.getType() != 'win32') or (not interfaces.IReactorProcess(reactor, None)):
Win32ProcessTestCase.skip = skipMessage
TestTwoProcessesNonPosix.skip = skipMessage
Dumbwin32procPidTest.skip = skipMessage
if not interfaces.IReactorProcess(reactor, None):
ProcessTestCase.skip = skipMessage
ClosingPipes.skip = skipMessage
|