Fri, 07 Oct 2016 22:50:48 +0200
Insert import hook to modify thread module to use our bootstrap.
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Relocated some methods from Debug*Thread and the remaining modules into a new one.
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1  # * coding: utf8 * 
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2  
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3  # Copyright (c) 2014  2016 Detlev Offenbach <detlev@dieoffenbachs.de> 
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4  # 
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5  
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6  """ 
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7  Module implementing an import hook patching thread modules to get debugged too. 
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8  """ 
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9  
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10  import os.path 
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11  import sys 
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12  
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13  if sys.version_info[0] == 2: 
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14  import thread as _thread 
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15  else: 
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16  import _thread 
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17  
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18  import threading 
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19  
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20  from DebugBase import DebugBase 
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21  
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22  
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23  class ThreadExtension(object): 
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24  """ 
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25  Class implementing the thread support for the debugger. 
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26  
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27  Provides methods for intercepting thread creation, retriving the running 
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28  threads and their name and state. 
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29  """ 
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30  def __init__(self): 
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31  """ 
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32  Constructor 
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33  """ 
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34  self.threadNumber = 1 
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35  self.enableImportHooks = True 
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36  self._original_start_new_thread = None 
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37  
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38  self.clientLock = threading.RLock() 
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39  
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40  # dictionary of all threads running {id: DebugBase} 
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41  self.threads = {_thread.get_ident(): self} 
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42  
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43  # the "current" thread, basically for variables view 
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44  self.currentThread = self 
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45  
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46  # special objects representing the main scripts thread and frame 
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47  self.mainThread = self 
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48  
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49  if sys.version_info[0] == 2: 
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50  self.threadModName = 'thread' 
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51  else: 
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52  self.threadModName = '_thread' 
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53  
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54  # reset already imported thread module to apply hooks at next import 
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55  del sys.modules[self.threadModName] 
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56  del sys.modules['threading'] 
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57  
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58  sys.meta_path.insert(0, self) 
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59  
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60  # provide a hook to perform a hard breakpoint 
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61  # Use it like this: 
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62  # if hasattr(sys, 'breakpoint): sys.breakpoint() 
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63  sys.breakpoint = self.set_trace 
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64  
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65  def attachThread(self, target=None, args=None, kwargs={}, 
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66  mainThread=False): 
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67  """ 
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68  Public method to setup a standard thread for DebugClient to debug. 
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69  
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70  If mainThread is True, then we are attaching to the already 
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71  started mainthread of the app and the rest of the args are ignored. 
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72  
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73  @param target the start function of the target thread (i.e. the user 
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74  code) 
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75  @param args arguments to pass to target 
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76  @param kwargs keyword arguments to pass to target 
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77  @param mainThread True, if we are attaching to the already 
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78  started mainthread of the app 
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79  @return identifier of the created thread 
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80  """ 
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81  if mainThread: 
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82  ident = _thread.get_ident() 
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83  name = 'MainThread' 
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84  newThread = self.mainThread 
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85  newThread.isMainThread = True 
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86  if self.debugging: 
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87  sys.setprofile(newThread.profile) 
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88  
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89  else: 
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90  newThread = DebugBase(self) 
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91  ident = self._original_start_new_thread( 
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92  newThread.bootstrap, (target, args, kwargs)) 
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93  name = 'Thread{0}'.format(self.threadNumber) 
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94  self.threadNumber += 1 
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95  
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96  newThread.id = ident 
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97  newThread.name = name 
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98  
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99  self.threads[ident] = newThread 
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100  
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101  return ident 
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102  
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103  def threadTerminated(self, threadId): 
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104  """ 
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105  Public method called when a DebugThread has exited. 
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106  
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107  @param threadId id of the DebugThread that has exited 
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108  @type int 
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109  """ 
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110  self.lockClient() 
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111  try: 
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112  del self.threads[threadId] 
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113  except KeyError: 
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114  pass 
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115  finally: 
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116  self.unlockClient() 
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117  
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118  def lockClient(self, blocking=True): 
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119  """ 
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120  Public method to acquire the lock for this client. 
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121  
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122  @param blocking flag to indicating a blocking lock 
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123  @type bool 
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124  @return flag indicating successful locking 
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125  @rtype bool 
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126  """ 
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127  if blocking: 
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128  self.clientLock.acquire() 
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129  else: 
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130  return self.clientLock.acquire(blocking) 
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131  
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132  def unlockClient(self): 
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133  """ 
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134  Public method to release the lock for this client. 
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135  """ 
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136  try: 
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137  self.clientLock.release() 
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138  except AssertionError: 
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139  pass 
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140  
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141  def setCurrentThread(self, id): 
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142  """ 
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143  Public method to set the current thread. 
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144  
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145  @param id the id the current thread should be set to. 
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146  """ 
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147  try: 
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148  self.lockClient() 
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149  if id is None: 
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150  self.currentThread = None 
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151  else: 
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152  self.currentThread = self.threads.get(id) 
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153  finally: 
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154  self.unlockClient() 
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155  
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156  def dumpThreadList(self): 
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157  """ 
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158  Public method to send the list of threads. 
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159  """ 
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160  threadList = [] 
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161  if len(self.threads) > 1: 
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162  currentId = _thread.get_ident() 
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163  # update thread names set by user (threading.setName) 
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164  threadNames = {t.ident: t.getName() for t in threading.enumerate()} 
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165  
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166  for id, thd in self.threads.items(): 
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167  d = {"id": id} 
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168  try: 
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169  d["name"] = threadNames.get(id, thd.name) 
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170  d["broken"] = thd.isBroken 
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171  except Exception: 
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172  d["name"] = 'UnknownThread' 
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173  d["broken"] = False 
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174  
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175  threadList.append(d) 
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176  else: 
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177  currentId = 1 
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178  d = {"id": 1} 
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179  d["name"] = "MainThread" 
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180  d["broken"] = self.isBroken 
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181  threadList.append(d) 
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182  
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183  self.sendJsonCommand("ResponseThreadList", { 
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184  "currentID": currentId, 
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185  "threadList": threadList, 
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186  }) 
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187  
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188  def find_module(self, fullname, path=None): 
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189  """ 
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190  Public method returning the module loader. 
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191  
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192  @param fullname name of the module to be loaded 
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193  @type str 
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194  @param path path to resolve the module name 
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195  @type str 
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196  @return module loader object 
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197  @rtype object 
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198  """ 
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199  if fullname in sys.modules or not self.debugging: 
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200  return None 
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201  if fullname == self.threadModName and self.enableImportHooks: 
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202  # Disable hook to be able to import original module 
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203  self.enableImportHooks = False 
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204  return self 
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205  
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206  return None 
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207  
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208  def load_module(self, fullname): 
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209  """ 
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210  Public method to load a module. 
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211  
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212  @param fullname name of the module to be loaded 
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213  @type str 
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214  @return reference to the loaded module 
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215  @rtype module 
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216  """ 
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217  module = __import__(fullname) 
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218  sys.modules[fullname] = module 
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219  if (fullname == self.threadModName and 
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220  self._original_start_new_thread is None): 
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221  # make thread hooks available to system 
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222  self._original_start_new_thread = module.start_new_thread 
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223  module.start_new_thread = self.attachThread 
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224  
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225  self.enableImportHooks = True 
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226  return module 
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227  
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228  
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229  # 
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230  # eflag: noqa = M702 