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annotate roundup/cgi/cgitb.py @ 5436:e70fe1d1215b

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Python 3 preparation: update tokenize use in cgitb.py. Note that the same interface that has changed incompatibly is also used in tools/pygettext.py. That file also needs fixing, but this patch does *not* attempt such a fix.
author Joseph Myers <jsm@polyomino.org.uk>
date Wed, 25 Jul 2018 11:40:44 +0000
parents 1ab2c81a64df
children 1a835db41674
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #
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2 # This module was written by Ka-Ping Yee, <ping@lfw.org>.
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3 #
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4
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5 """Extended CGI traceback handler by Ka-Ping Yee, <ping@lfw.org>.
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6 """
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7 from __future__ import print_function
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8 __docformat__ = 'restructuredtext'
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9
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10 import sys, os, keyword, linecache, tokenize, inspect, cgi
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11 import pydoc, traceback
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12
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13 from roundup.cgi import templating, TranslationService
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14 from roundup.anypy.strings import s2b
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15
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16 def get_translator(i18n=None):
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17 """Return message translation function (gettext)
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18
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19 Parameters:
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20 i18n - translation service, such as roundup.i18n module
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21 or TranslationService object.
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22
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23 Return ``gettext`` attribute of the ``i18n`` object, if available
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24 (must be a message translation function with one argument).
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25 If ``gettext`` cannot be obtained from ``i18n``, take default
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26 TranslationService.
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27
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28 """
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29 try:
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30 return i18n.gettext
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31 except:
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32 return TranslationService.get_translation().gettext
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33
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34 def breaker():
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35 return ('<body bgcolor="white">' +
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36 '<font color="white" size="-5"> > </font> ' +
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37 '</table>' * 5)
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38
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39 def niceDict(indent, dict):
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40 l = []
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41 for k in sorted(dict):
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42 v = dict[k]
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43 l.append('<tr><td><strong>%s</strong></td><td>%s</td></tr>'%(k,
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44 cgi.escape(repr(v))))
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45 return '\n'.join(l)
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46
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47 def pt_html(context=5, i18n=None):
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48 _ = get_translator(i18n)
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49 esc = cgi.escape
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50 exc_info = [esc(str(value)) for value in sys.exc_info()[:2]]
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51 l = [_('<h1>Templating Error</h1>\n'
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52 '<p><b>%(exc_type)s</b>: %(exc_value)s</p>\n'
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53 '<p class="help">Debugging information follows</p>'
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54 ) % {'exc_type': exc_info[0], 'exc_value': exc_info[1]},
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55 '<ol>',]
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56 from roundup.cgi.PageTemplates.Expressions import TraversalError
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57 t = inspect.trace(context)
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58 t.reverse()
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59 for frame, file, lnum, func, lines, index in t:
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60 args, varargs, varkw, locals = inspect.getargvalues(frame)
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61 if '__traceback_info__' in locals:
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62 ti = locals['__traceback_info__']
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63 if isinstance(ti, TraversalError):
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64 s = []
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65 for name, info in ti.path:
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66 s.append(_('<li>"%(name)s" (%(info)s)</li>')
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67 % {'name': name, 'info': esc(repr(info))})
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68 s = '\n'.join(s)
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69 l.append(_('<li>Looking for "%(name)s", '
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70 'current path:<ol>%(path)s</ol></li>'
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71 ) % {'name': ti.name, 'path': s})
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72 else:
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73 l.append(_('<li>In %s</li>') % esc(str(ti)))
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74 if '__traceback_supplement__' in locals:
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75 ts = locals['__traceback_supplement__']
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76 if len(ts) == 2:
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77 supp, context = ts
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78 s = _('A problem occurred in your template "%s".') \
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79 % str(context.id)
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80 if context._v_errors:
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81 s = s + '<br>' + '<br>'.join(
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82 [esc(x) for x in context._v_errors])
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83 l.append('<li>%s</li>'%s)
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84 elif len(ts) == 3:
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85 supp, context, info = ts
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86 l.append(_('''
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87 <li>While evaluating the %(info)r expression on line %(line)d
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88 <table class="otherinfo" style="font-size: 90%%">
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89 <tr><th colspan="2" class="header">Current variables:</th></tr>
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90 %(globals)s
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91 %(locals)s
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92 </table></li>
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93 ''') % {
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94 'info': info,
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95 'line': context.position[0],
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96 'globals': niceDict(' ', context.global_vars),
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97 'locals': niceDict(' ', context.local_vars)
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98 })
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99
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100 l.append('''
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101 </ol>
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102 <table style="font-size: 80%%; color: gray">
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103 <tr><th class="header" align="left">%s</th></tr>
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104 <tr><td><pre>%s</pre></td></tr>
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105 </table>''' % (_('Full traceback:'), cgi.escape(''.join(
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106 traceback.format_exception(*sys.exc_info())
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107 ))))
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108 l.append('<p>&nbsp;</p>')
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109 return '\n'.join(l)
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110
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111 def html(context=5, i18n=None):
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112 _ = get_translator(i18n)
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113 etype, evalue = sys.exc_info()[0], sys.exc_info()[1]
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114 if type(etype) is type:
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115 etype = etype.__name__
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116 pyver = 'Python ' + sys.version.split()[0] + '<br>' + sys.executable
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117 head = pydoc.html.heading(
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118 _('<font size=+1><strong>%(exc_type)s</strong>: %(exc_value)s</font>')
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119 % {'exc_type': etype, 'exc_value': evalue},
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120 '#ffffff', '#777777', pyver)
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121
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122 head = head + (_('<p>A problem occurred while running a Python script. '
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123 'Here is the sequence of function calls leading up to '
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124 'the error, with the most recent (innermost) call first. '
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125 'The exception attributes are:'))
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126
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127 indent = '<tt><small>%s</small>&nbsp;</tt>' % ('&nbsp;' * 5)
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128 traceback = []
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129 for frame, file, lnum, func, lines, index in inspect.trace(context):
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130 if file is None:
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131 link = _("&lt;file is None - probably inside <tt>eval</tt> "
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132 "or <tt>exec</tt>&gt;")
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133 else:
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134 file = os.path.abspath(file)
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135 link = '<a href="file:%s">%s</a>' % (file, pydoc.html.escape(file))
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136 args, varargs, varkw, locals = inspect.getargvalues(frame)
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137 if func == '?':
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138 call = ''
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139 else:
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140 call = _('in <strong>%s</strong>') % func + inspect.formatargvalues(
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141 args, varargs, varkw, locals,
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142 formatvalue=lambda value: '=' + pydoc.html.repr(value))
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143
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144 level = '''
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145 <table width="100%%" bgcolor="#dddddd" cellspacing=0 cellpadding=2 border=0>
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146 <tr><td>%s %s</td></tr></table>''' % (link, call)
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147
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148 if index is None or file is None:
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149 traceback.append('<p>' + level)
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150 continue
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151
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152 # do a file inspection
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153 names = []
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154 def tokeneater(type, token, start, end, line, names=names):
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155 if type == tokenize.NAME and token not in keyword.kwlist:
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156 if token not in names:
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157 names.append(token)
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158 if type == tokenize.NEWLINE: raise IndexError
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159 def linereader(file=file, lnum=[lnum]):
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160 line = s2b(linecache.getline(file, lnum[0]))
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161 lnum[0] = lnum[0] + 1
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162 return line
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163
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164 # The interface that is tokenize.tokenize in Python 3 is
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165 # called tokenize.generate_tokens in Python 2. However,
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166 # Python 2 has tokenize.tokenize with a different interface,
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167 # and Python 3 has an undocumented generate_tokens function,
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168 # also with a different interface, so a version check is
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169 # needed instead of checking for which functions exist.
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170 if sys.version_info[0] > 2:
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171 tokenize_fn = tokenize.tokenize
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172 else:
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173 tokenize_fn = tokenize.generate_tokens
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174 try:
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175 for t in tokenize_fn(linereader):
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176 tokeneater(*t)
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177 except IndexError:
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178 pass
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179 lvals = []
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180 for name in names:
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181 if name in frame.f_code.co_varnames:
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182 if name in locals:
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183 value = pydoc.html.repr(locals[name])
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184 else:
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185 value = _('<em>undefined</em>')
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186 name = '<strong>%s</strong>' % name
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187 else:
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188 if name in frame.f_globals:
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189 value = pydoc.html.repr(frame.f_globals[name])
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190 else:
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191 value = _('<em>undefined</em>')
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192 name = '<em>global</em> <strong>%s</strong>' % name
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193 lvals.append('%s&nbsp;= %s'%(name, value))
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194 if lvals:
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195 lvals = ', '.join(lvals)
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196 lvals = indent + '<small><font color="#909090">%s'\
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197 '</font></small><br>'%lvals
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198 else:
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199 lvals = ''
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200
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201 excerpt = []
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202 i = lnum - index
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203 for line in lines:
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204 number = '&nbsp;' * (5-len(str(i))) + str(i)
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205 number = '<small><font color="#909090">%s</font></small>' % number
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206 line = '<tt>%s&nbsp;%s</tt>' % (number, pydoc.html.preformat(line))
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207 if i == lnum:
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208 line = '''
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209 <table width="100%%" bgcolor="white" cellspacing=0 cellpadding=0 border=0>
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210 <tr><td>%s</td></tr></table>''' % line
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211 excerpt.append('\n' + line)
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212 if i == lnum:
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213 excerpt.append(lvals)
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214 i = i + 1
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215 traceback.append('<p>' + level + '\n'.join(excerpt))
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216
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217 traceback.reverse()
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218
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219 exception = '<p><strong>%s</strong>: %s' % (str(etype), str(evalue))
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220 attribs = []
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221 for name in dir(evalue):
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222 value = pydoc.html.repr(getattr(evalue, name))
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223 attribs.append('<br>%s%s&nbsp;= %s' % (indent, name, value))
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224
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225 return head + ' '.join(attribs) + ' '.join(traceback) + '<p>&nbsp;</p>'
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226
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227 def handler():
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228 print(breaker())
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229 print(html())
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230
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231 # vim: set filetype=python ts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/