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# Copyright (c) 2017 Mark D. Hill and David A. Wood
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Sean Wilson
import multiprocessing
import pdb
import os
import sys
import threading
import traceback
import log
pdb._Pdb = pdb.Pdb
class ForkedPdb(pdb._Pdb):
'''
A Pdb subclass that may be used from a forked multiprocessing child
'''
io_manager = None
def interaction(self, *args, **kwargs):
_stdin = sys.stdin
self.io_manager.restore_pipes()
try:
sys.stdin = open('/dev/stdin')
pdb._Pdb.interaction(self, *args, **kwargs)
finally:
sys.stdin = _stdin
self.io_manager.replace_pipes()
#TODO Refactor duplicate stdout, stderr logic
class IoManager(object):
def __init__(self, test, suite):
self.test = test
self.suite = suite
self.log = log.test_log
self._init_pipes()
def _init_pipes(self):
self.stdout_rp, self.stdout_wp = os.pipe()
self.stderr_rp, self.stderr_wp = os.pipe()
def close_parent_pipes(self):
os.close(self.stdout_wp)
os.close(self.stderr_wp)
def setup(self):
self.replace_pipes()
self.fixup_pdb()
def fixup_pdb(self):
ForkedPdb.io_manager = self
pdb.Pdb = ForkedPdb
def replace_pipes(self):
self.old_stderr = os.dup(sys.stderr.fileno())
self.old_stdout = os.dup(sys.stdout.fileno())
os.dup2(self.stderr_wp, sys.stderr.fileno())
sys.stderr = os.fdopen(self.stderr_wp, 'w', 0)
os.dup2(self.stdout_wp, sys.stdout.fileno())
sys.stdout = os.fdopen(self.stdout_wp, 'w', 0)
def restore_pipes(self):
self.stderr_wp = os.dup(sys.stderr.fileno())
self.stdout_wp = os.dup(sys.stdout.fileno())
os.dup2(self.old_stderr, sys.stderr.fileno())
sys.stderr = os.fdopen(self.old_stderr, 'w', 0)
os.dup2(self.old_stdout, sys.stdout.fileno())
sys.stdout = os.fdopen(self.old_stdout, 'w', 0)
def start_loggers(self):
self.log_ouput()
def log_ouput(self):
def _log_output(pipe, log_callback):
with os.fdopen(pipe, 'r') as pipe:
# Read iteractively, don't allow input to fill the pipe.
for line in iter(pipe.readline, ''):
log_callback(line)
# Don't keep a backpointer to self in the thread.
log = self.log
test = self.test
suite = self.suite
self.stdout_thread = threading.Thread(
target=_log_output,
args=(self.stdout_rp,
lambda buf: log.test_stdout(test, suite, buf))
)
self.stderr_thread = threading.Thread(
target=_log_output,
args=(self.stderr_rp,
lambda buf: log.test_stderr(test, suite, buf))
)
# Daemon + Join to not lock up main thread if something breaks
# but provide consistent execution if nothing goes wrong.
self.stdout_thread.daemon = True
self.stderr_thread.daemon = True
self.stdout_thread.start()
self.stderr_thread.start()
def join_loggers(self):
self.stdout_thread.join()
self.stderr_thread.join()
class SubprocessException(Exception):
def __init__(self, exception, trace):
super(SubprocessException, self).__init__(trace)
class ExceptionProcess(multiprocessing.Process):
class Status():
def __init__(self, exitcode, exception_tuple):
self.exitcode = exitcode
if exception_tuple is not None:
self.trace = exception_tuple[1]
self.exception = exception_tuple[0]
else:
self.exception = None
self.trace = None
def __init__(self, *args, **kwargs):
multiprocessing.Process.__init__(self, *args, **kwargs)
self._pconn, self._cconn = multiprocessing.Pipe()
self._exception = None
def run(self):
try:
super(ExceptionProcess, self).run()
self._cconn.send(None)
except Exception as e:
tb = traceback.format_exc()
self._cconn.send((e, tb))
raise
@property
def status(self):
if self._pconn.poll():
self._exception = self._pconn.recv()
return self.Status(self.exitcode, self._exception)
class Sandbox(object):
def __init__(self, test_parameters):
self.params = test_parameters
self.io_manager = IoManager(self.params.test, self.params.suite)
self.p = ExceptionProcess(target=self.entrypoint)
# Daemon + Join to not lock up main thread if something breaks
self.p.daemon = True
self.io_manager.start_loggers()
self.p.start()
self.io_manager.close_parent_pipes()
self.p.join()
self.io_manager.join_loggers()
status = self.p.status
if status.exitcode:
raise SubprocessException(status.exception, status.trace)
def entrypoint(self):
self.io_manager.setup()
self.params.test.test(self.params)
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