sandbox.py revision 12882:dd87d7f2f3e5
1# Copyright (c) 2017 Mark D. Hill and David A. Wood 2# All rights reserved. 3# 4# Redistribution and use in source and binary forms, with or without 5# modification, are permitted provided that the following conditions are 6# met: redistributions of source code must retain the above copyright 7# notice, this list of conditions and the following disclaimer; 8# redistributions in binary form must reproduce the above copyright 9# notice, this list of conditions and the following disclaimer in the 10# documentation and/or other materials provided with the distribution; 11# neither the name of the copyright holders nor the names of its 12# contributors may be used to endorse or promote products derived from 13# this software without specific prior written permission. 14# 15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26# 27# Authors: Sean Wilson 28 29import multiprocessing 30import pdb 31import os 32import sys 33import threading 34import traceback 35 36import log 37 38pdb._Pdb = pdb.Pdb 39class ForkedPdb(pdb._Pdb): 40 ''' 41 A Pdb subclass that may be used from a forked multiprocessing child 42 ''' 43 io_manager = None 44 def interaction(self, *args, **kwargs): 45 _stdin = sys.stdin 46 self.io_manager.restore_pipes() 47 try: 48 sys.stdin = open('/dev/stdin') 49 pdb._Pdb.interaction(self, *args, **kwargs) 50 finally: 51 sys.stdin = _stdin 52 self.io_manager.replace_pipes() 53 54 55#TODO Refactor duplicate stdout, stderr logic 56class IoManager(object): 57 def __init__(self, test, suite): 58 self.test = test 59 self.suite = suite 60 self.log = log.test_log 61 self._init_pipes() 62 63 def _init_pipes(self): 64 self.stdout_rp, self.stdout_wp = os.pipe() 65 self.stderr_rp, self.stderr_wp = os.pipe() 66 67 def close_parent_pipes(self): 68 os.close(self.stdout_wp) 69 os.close(self.stderr_wp) 70 71 def setup(self): 72 self.replace_pipes() 73 self.fixup_pdb() 74 75 def fixup_pdb(self): 76 ForkedPdb.io_manager = self 77 pdb.Pdb = ForkedPdb 78 79 def replace_pipes(self): 80 self.old_stderr = os.dup(sys.stderr.fileno()) 81 self.old_stdout = os.dup(sys.stdout.fileno()) 82 83 os.dup2(self.stderr_wp, sys.stderr.fileno()) 84 sys.stderr = os.fdopen(self.stderr_wp, 'w', 0) 85 os.dup2(self.stdout_wp, sys.stdout.fileno()) 86 sys.stdout = os.fdopen(self.stdout_wp, 'w', 0) 87 88 def restore_pipes(self): 89 self.stderr_wp = os.dup(sys.stderr.fileno()) 90 self.stdout_wp = os.dup(sys.stdout.fileno()) 91 92 os.dup2(self.old_stderr, sys.stderr.fileno()) 93 sys.stderr = os.fdopen(self.old_stderr, 'w', 0) 94 os.dup2(self.old_stdout, sys.stdout.fileno()) 95 sys.stdout = os.fdopen(self.old_stdout, 'w', 0) 96 97 def start_loggers(self): 98 self.log_ouput() 99 100 def log_ouput(self): 101 def _log_output(pipe, log_callback): 102 with os.fdopen(pipe, 'r') as pipe: 103 # Read iteractively, don't allow input to fill the pipe. 104 for line in iter(pipe.readline, ''): 105 log_callback(line) 106 107 # Don't keep a backpointer to self in the thread. 108 log = self.log 109 test = self.test 110 suite = self.suite 111 112 self.stdout_thread = threading.Thread( 113 target=_log_output, 114 args=(self.stdout_rp, 115 lambda buf: log.test_stdout(test, suite, buf)) 116 ) 117 self.stderr_thread = threading.Thread( 118 target=_log_output, 119 args=(self.stderr_rp, 120 lambda buf: log.test_stderr(test, suite, buf)) 121 ) 122 123 # Daemon + Join to not lock up main thread if something breaks 124 # but provide consistent execution if nothing goes wrong. 125 self.stdout_thread.daemon = True 126 self.stderr_thread.daemon = True 127 self.stdout_thread.start() 128 self.stderr_thread.start() 129 130 def join_loggers(self): 131 self.stdout_thread.join() 132 self.stderr_thread.join() 133 134 135class SubprocessException(Exception): 136 def __init__(self, exception, trace): 137 super(SubprocessException, self).__init__(trace) 138 139class ExceptionProcess(multiprocessing.Process): 140 class Status(): 141 def __init__(self, exitcode, exception_tuple): 142 self.exitcode = exitcode 143 if exception_tuple is not None: 144 self.trace = exception_tuple[1] 145 self.exception = exception_tuple[0] 146 else: 147 self.exception = None 148 self.trace = None 149 150 def __init__(self, *args, **kwargs): 151 multiprocessing.Process.__init__(self, *args, **kwargs) 152 self._pconn, self._cconn = multiprocessing.Pipe() 153 self._exception = None 154 155 def run(self): 156 try: 157 super(ExceptionProcess, self).run() 158 self._cconn.send(None) 159 except Exception as e: 160 tb = traceback.format_exc() 161 self._cconn.send((e, tb)) 162 raise 163 164 @property 165 def status(self): 166 if self._pconn.poll(): 167 self._exception = self._pconn.recv() 168 169 return self.Status(self.exitcode, self._exception) 170 171 172class Sandbox(object): 173 def __init__(self, test_parameters): 174 175 self.params = test_parameters 176 self.io_manager = IoManager(self.params.test, self.params.suite) 177 178 self.p = ExceptionProcess(target=self.entrypoint) 179 # Daemon + Join to not lock up main thread if something breaks 180 self.p.daemon = True 181 self.io_manager.start_loggers() 182 self.p.start() 183 self.io_manager.close_parent_pipes() 184 self.p.join() 185 self.io_manager.join_loggers() 186 187 status = self.p.status 188 if status.exitcode: 189 raise SubprocessException(status.exception, status.trace) 190 191 def entrypoint(self): 192 self.io_manager.setup() 193 self.params.test.test(self.params) 194