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annotate pydershell/pydershell.py @ 12:f024e41d0fb9

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More refactoring, a bit more documentation.
author Atul Varma <varmaa@toolness.com>
date Sun, 06 Sep 2009 14:25:10 -0700
parents 74f27983a350
children 2a3313bfe574
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11
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1 #! /usr/bin/env python
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2
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3 import sys
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4 import time
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5 import threading
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6 import traceback
12
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7 import weakref
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8
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9 import pydermonkey
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10
12
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11 class ContextWatchdogThread(threading.Thread):
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12 """
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13 Watches active JS contexts and triggers their operation callbacks
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14 at a regular interval.
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15 """
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16
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17 def __init__(self, interval=0.25):
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18 threading.Thread.__init__(self)
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19 self._lock = threading.Lock()
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20 self._stop = threading.Event()
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21 self._contexts = []
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22 self.interval = interval
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23 self.setDaemon(True)
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24
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25 def add_context(self, cx):
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26 self._lock.acquire()
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27 try:
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28 self._contexts.append(weakref.ref(cx))
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29 finally:
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30 self._lock.release()
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31
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32 def join(self):
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33 self._stop.set()
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34 threading.Thread.join(self)
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35
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36 def run(self):
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37 while not self._stop.isSet():
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38 time.sleep(self.interval)
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39 new_list = []
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40 self._lock.acquire()
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41 try:
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42 for weakcx in self._contexts:
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43 cx = weakcx()
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44 if cx:
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45 new_list.append(weakcx)
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46 cx.trigger_operation_callback()
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47 self._contexts = new_list
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48 finally:
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49 self._lock.release()
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50
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51 # Create a global watchdog.
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52 watchdog = ContextWatchdogThread()
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53 watchdog.start()
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54
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55 class InternalError(BaseException):
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56 """
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57 Represents an error in a JS-wrapped Python function that wasn't
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58 expected to happen; because it's derived from BaseException, it
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59 unrolls the whole JS/Python stack so that the error can be
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60 reported to the outermost calling code.
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61 """
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62
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63 def __init__(self):
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64 BaseException.__init__(self)
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65 self.exc_info = sys.exc_info()
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66
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67 def safejsfunc(cx, on_obj, name=None):
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68 """
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69 Exposes the decorated Python function on the given JS object.
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70
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71 Any unexpected exceptions raised by the function will be
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72 re-raised as InternalError exceptions.
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73 """
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74
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75 def make_wrapper(func):
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76 if name is None:
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77 func_name = func.__name__
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78 else:
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79 func_name = name
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80 def wrapper(func_cx, this, args):
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81 try:
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82 return func(func_cx, this, args)
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83 except pydermonkey.error:
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84 raise
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85 except Exception:
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86 raise InternalError()
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87 cx.define_property(
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88 on_obj,
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89 func_name,
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90 cx.new_function(wrapper, func_name)
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91 )
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92 return func
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93 return make_wrapper
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94
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95 def format_stack(js_stack):
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96 """
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97 Returns a formatted Python-esque stack traceback of the given
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98 JS stack.
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99 """
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100
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101 STACK_LINE =" File \"%(filename)s\", line %(lineno)d, in %(name)s"
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102
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103 lines = []
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104 while js_stack:
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105 script = js_stack['script']
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106 function = js_stack['function']
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107 if script:
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108 frameinfo = dict(filename = script.filename,
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109 lineno = js_stack['lineno'],
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110 name = '<module>')
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111 elif function and not function.is_python:
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112 frameinfo = dict(filename = function.filename,
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113 lineno = js_stack['lineno'],
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114 name = function.name)
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115 else:
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116 frameinfo = None
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117 if frameinfo:
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118 lines.insert(0, STACK_LINE % frameinfo)
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119 js_stack = js_stack['caller']
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120 lines.insert(0, "Traceback (most recent call last):")
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121 return '\n'.join(lines)
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122
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123 class JSRuntime(object):
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124 """
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125 A JS runtime capable of loading and executing scripts.
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126 """
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127
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128 def __init__(self, watchdog=watchdog):
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129 rt = pydermonkey.Runtime()
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130 cx = rt.new_context()
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131 globalobj = cx.new_object()
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132 cx.init_standard_classes(globalobj)
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133
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134 @safejsfunc(cx, globalobj)
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135 def foo(cx, this, args):
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136 return cx.call_function(this, args[0], ())
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137
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138 @safejsfunc(cx, globalobj, 'print')
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139 def jsprint(cx, this, args):
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140 if len(args) > 0:
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141 print args[0]
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142
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143 cx.set_operation_callback(self._opcb)
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144 cx.set_throw_hook(self._throwhook)
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145 watchdog.add_context(cx)
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146
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147 self.rt = rt
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148 self.cx = cx
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149 self.globalobj = globalobj
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150 self.curr_exc = None
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151 self.py_stack = None
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152 self.js_stack = None
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153
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154 def _opcb(self, cx):
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155 # Don't do anything; if a keyboard interrupt was triggered,
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156 # it'll get raised here automatically.
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157 pass
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158
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159 def _throwhook(self, cx):
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160 curr_exc = cx.get_pending_exception()
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161 if self.curr_exc != curr_exc:
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162 self.curr_exc = curr_exc
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163 self.py_stack = traceback.extract_stack()
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164 self.js_stack = cx.get_stack()
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165
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166 def run_script(self, filename):
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167 contents = open(filename).read()
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168 cx = self.cx
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169 try:
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170 cx.evaluate_script(self.globalobj, contents,
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171 filename, 1)
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172 except pydermonkey.error, e:
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173 print format_stack(self.js_stack)
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174 print e.args[1]
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175 except InternalError, e:
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176 print "An internal error occurred."
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177 traceback.print_tb(e.exc_info[2])
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178 print e.exc_info[1]
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179
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180 if __name__ == '__main__':
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181 runtime = JSRuntime()
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182 runtime.run_script('test.js')