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annotate roundup/cgi/cgitb.py @ 6747:d32d43e4a5ba

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wsgi can cache tracker instance enabled by feature flag. Patch by Marcus Priesch caches a loaded tracker instance and reuse it for future client sessions. It is enabled by a feature flag in wsgi.py since it arrived during the 2.2.0 beta period. The provided wsgi.py is modified to enable it. Testing is run with flag enabled and disabled. Ralf Schlatterbeck and Marcus tested it on one of their larger more complex trackers and it sped up the response time to a client request by a factor of 3 (270ms down to about 80-85ms).
author John Rouillard <rouilj@ieee.org>
date Sat, 02 Jul 2022 14:04:00 -0400
parents 70e6b053193b
children 3129d73e8535
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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
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11 import pydoc, traceback
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12
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13 from roundup.anypy.html import html_escape
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14
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15 from roundup.cgi import TranslationService
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16 from roundup.anypy.strings import s2b
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18
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19 def get_translator(i18n=None):
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20 """Return message translation function (gettext)
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21
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22 Parameters:
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23 i18n - translation service, such as roundup.i18n module
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24 or TranslationService object.
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25
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26 Return ``gettext`` attribute of the ``i18n`` object, if available
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27 (must be a message translation function with one argument).
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28 If ``gettext`` cannot be obtained from ``i18n``, take default
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29 TranslationService.
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30
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31 """
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32 try:
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33 return i18n.gettext
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34 except AttributeError:
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35 return TranslationService.get_translation().gettext
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36
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37
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38 def breaker():
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39 return ('<body bgcolor="white">' +
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40 '<font color="white" size="-5"> > </font> ' +
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41 '</table>' * 5)
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42
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43
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44 def niceDict(indent, dict):
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45 l = []
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46 for k in sorted(dict):
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47 v = dict[k]
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48 l.append('<tr><td><strong>%s</strong></td><td>%s</td></tr>' % (k,
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49 html_escape(repr(v))))
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50 return '\n'.join(l)
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51
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52
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53 def pt_html(context=5, i18n=None):
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54 _ = get_translator(i18n)
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55 esc = html_escape
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56 exc_info = [esc(str(value)) for value in sys.exc_info()[:2]]
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57 l = [_('<h1>Templating Error</h1>\n'
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58 '<p><b>%(exc_type)s</b>: %(exc_value)s</p>\n'
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59 '<p class="help">Debugging information follows</p>'
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60 ) % {'exc_type': exc_info[0], 'exc_value': exc_info[1]},
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61 '<ol>', ]
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62 from roundup.cgi.PageTemplates.Expressions import TraversalError
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63 t = inspect.trace(context)
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64 t.reverse()
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65 for frame, file, lnum, func, lines, index in t:
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66 args, varargs, varkw, locals = inspect.getargvalues(frame)
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67 if '__traceback_info__' in locals:
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68 ti = locals['__traceback_info__']
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69 if isinstance(ti, TraversalError):
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70 s = []
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71 for name, info in ti.path:
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72 s.append(_('<li>"%(name)s" (%(info)s)</li>')
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73 % {'name': name, 'info': esc(repr(info))})
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74 s = '\n'.join(s)
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75 l.append(_('<li>Looking for "%(name)s", '
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76 'current path:<ol>%(path)s</ol></li>'
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77 ) % {'name': ti.name, 'path': s})
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78 else:
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79 l.append(_('<li>In %s</li>') % esc(str(ti)))
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80 if '__traceback_supplement__' in locals:
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81 ts = locals['__traceback_supplement__']
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82 if len(ts) == 2:
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83 supp, context = ts
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84 s = _('A problem occurred in your template "%s".') \
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85 % str(context.id)
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86 if context._v_errors:
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87 s = s + '<br>' + '<br>'.join(
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88 [esc(x) for x in context._v_errors])
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89 l.append('<li>%s</li>' % s)
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90 elif len(ts) == 3:
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91 supp, context, info = ts
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92 l.append(_('''
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93 <li>While evaluating the %(info)r expression on line %(line)d
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94 <table class="otherinfo" style="font-size: 90%%">
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95 <tr><th colspan="2" class="header">Current variables:</th></tr>
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96 %(globals)s
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97 %(locals)s
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98 </table></li>
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99 ''') % {
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100 'info': info,
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101 'line': context.position[0],
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102 'globals': niceDict(' ', context.global_vars),
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103 'locals': niceDict(' ', context.local_vars)
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104 })
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105
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106 l.append('''
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107 </ol>
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108 <table style="font-size: 80%%; color: gray">
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109 <tr><th class="header" align="left">%s</th></tr>
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110 <tr><td><pre>%s</pre></td></tr>
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111 </table>''' % (_('Full traceback:'), html_escape(''.join(
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112 traceback.format_exception(*sys.exc_info())
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113 ))))
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114 l.append('<p>&nbsp;</p>')
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115 return '\n'.join(l)
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116
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117
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118 def html(context=5, i18n=None):
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119 _ = get_translator(i18n)
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120 etype, evalue = sys.exc_info()[0], sys.exc_info()[1]
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121 if type(etype) is type:
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122 etype = etype.__name__
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123 pyver = 'Python ' + sys.version.split()[0] + '<br>' + sys.executable
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124 head = pydoc.html.heading(
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125 _('<font size=+1><strong>%(exc_type)s</strong>: %(exc_value)s</font>')
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126 % {'exc_type': etype, 'exc_value': evalue},
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127 '#ffffff', '#777777', pyver)
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128
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129 head = head + (_('<p>A problem occurred while running a Python script. '
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130 'Here is the sequence of function calls leading up to '
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131 'the error, with the most recent (innermost) call first. '
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132 'The exception attributes are:'))
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133
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134 indent = '<tt><small>%s</small>&nbsp;</tt>' % ('&nbsp;' * 5)
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135 traceback = []
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136 for frame, file, lnum, func, lines, index in inspect.trace(context):
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137 if file is None:
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138 link = _("&lt;file is None - probably inside <tt>eval</tt> "
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139 "or <tt>exec</tt>&gt;")
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140 else:
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141 file = os.path.abspath(file)
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142 link = '<a href="file:%s">%s</a>' % (file, pydoc.html.escape(file))
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143 args, varargs, varkw, locals = inspect.getargvalues(frame)
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144 if func == '?':
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145 call = ''
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146 else:
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147 call = _('in <strong>%s</strong>') % \
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148 func + inspect.formatargvalues(
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149 args, varargs, varkw, locals,
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150 formatvalue=lambda value: '=' + pydoc.html.repr(value))
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151
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152 level = '''
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153 <table width="100%%" bgcolor="#dddddd" cellspacing=0 cellpadding=2 border=0>
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154 <tr><td>%s %s</td></tr></table>''' % (link, call)
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155
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156 if index is None or file is None:
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157 traceback.append('<p>' + level)
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158 continue
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159
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160 # do a file inspection
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161 names = []
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162
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163 def tokeneater(type, token, start, end, line, names=names):
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164 if type == tokenize.NAME and token not in keyword.kwlist:
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165 if token not in names:
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166 names.append(token)
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167 if type == tokenize.NEWLINE: raise IndexError
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168
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169 def linereader(file=file, lnum=[lnum]):
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170 line = s2b(linecache.getline(file, lnum[0]))
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171 lnum[0] = lnum[0] + 1
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172 return line
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173
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174 # The interface that is tokenize.tokenize in Python 3 is
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175 # called tokenize.generate_tokens in Python 2. However,
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176 # Python 2 has tokenize.tokenize with a different interface,
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177 # and Python 3 has an undocumented generate_tokens function,
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178 # also with a different interface, so a version check is
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179 # needed instead of checking for which functions exist.
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180 if sys.version_info[0] > 2:
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181 tokenize_fn = tokenize.tokenize
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182 else:
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183 tokenize_fn = tokenize.generate_tokens
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184 try:
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185 for t in tokenize_fn(linereader):
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186 tokeneater(*t)
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187 except IndexError:
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188 pass
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189 lvals = []
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190 for name in names:
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191 if name in frame.f_code.co_varnames:
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192 if name in locals:
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193 value = pydoc.html.repr(locals[name])
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194 else:
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195 value = _('<em>undefined</em>')
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196 name = '<strong>%s</strong>' % name
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197 else:
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198 if name in frame.f_globals:
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199 value = pydoc.html.repr(frame.f_globals[name])
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200 else:
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201 value = _('<em>undefined</em>')
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202 name = '<em>global</em> <strong>%s</strong>' % name
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203 lvals.append('%s&nbsp;= %s' % (name, value))
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204 if lvals:
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205 lvals = ', '.join(lvals)
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206 lvals = indent + '<small><font color="#909090">%s'\
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207 '</font></small><br>' % lvals
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208 else:
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209 lvals = ''
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210
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211 excerpt = []
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212 i = lnum - index
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213 for line in lines:
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214 number = '&nbsp;' * (5-len(str(i))) + str(i)
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215 number = '<small><font color="#909090">%s</font></small>' % number
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216 line = '<tt>%s&nbsp;%s</tt>' % (number, pydoc.html.preformat(line))
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217 if i == lnum:
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218 line = '''
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219 <table width="100%%" bgcolor="white" cellspacing=0 cellpadding=0 border=0>
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220 <tr><td>%s</td></tr></table>''' % line
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221 excerpt.append('\n' + line)
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222 if i == lnum:
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223 excerpt.append(lvals)
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224 i = i + 1
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225 traceback.append('<p>' + level + '\n'.join(excerpt))
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226
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227 traceback.reverse()
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228
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229 exception = '<p><strong>%s</strong>: %s' % (str(etype), str(evalue))
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230 attribs = []
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231 for name in dir(evalue):
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232 value = pydoc.html.repr(getattr(evalue, name))
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233 attribs.append('<br>%s%s&nbsp;= %s' % (indent, name, value))
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234
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235 return head + ' '.join(attribs) + ' '.join(traceback) + '<p>&nbsp;</p>'
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236
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237
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238 def handler():
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239 print(breaker())
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240 print(html())
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241
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242 # vim: set filetype=python ts=4 sw=4 et si :
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