annotate MoinMoin/support/cgitb.py @ 35:f0af060fb82b

making people choose the right approach to page_front_page imported from: moin--main--1.5--patch-36
author Thomas Waldmann <tw@waldmann-edv.de>
date Sun, 25 Sep 2005 14:45:38 +0000
parents 77665d8e2254
children cf52f97a5857
rev   line source
0
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1 """Handle exceptions in CGI scripts by formatting tracebacks into nice HTML.
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2
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3 To enable this module, do:
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4
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5 import cgitb; cgitb.enable()
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6
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7 at the top of your CGI script. The optional arguments to enable() are:
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8
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9 display - if true, tracebacks are displayed in the web browser
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10 logdir - if set, tracebacks are written to files in this directory
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11 context - number of lines of source code to show for each stack frame
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12
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13 By default, tracebacks are displayed but not saved, and context is 5.
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14
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15 Alternatively, if you have caught an exception and want cgitb to display it
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16 for you, call cgitb.handler(). The optional argument to handler() is a 3-item
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17 tuple (etype, evalue, etb) just like the value of sys.exc_info()."""
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18
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19 __author__ = 'Ka-Ping Yee'
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20 __version__ = '$Revision: 1.10 $'
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21
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22 import sys
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23
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24 def reset():
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25 """Return a string that resets the CGI and browser to a known state."""
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26 return '''<!--: spam
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27 Content-Type: text/html
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28
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29 <body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> -->
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30 <body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --> -->
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31 </font> </font> </font> </script> </object> </blockquote> </pre>
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32 </table> </table> </table> </table> </table> </font> </font> </font>'''
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33
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34 __UNDEF__ = [] # a special sentinel object
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35 def small(text): return '<small>' + text + '</small>'
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36 def strong(text): return '<strong>' + text + '</strong>'
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37 def grey(text): return '<font color="#909090">' + text + '</font>'
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38
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39 def lookup(name, frame, locals):
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40 """Find the value for a given name in the given environment."""
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41 if name in locals:
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42 return 'local', locals[name]
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43 if name in frame.f_globals:
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44 return 'global', frame.f_globals[name]
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45 return None, __UNDEF__
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46
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47 def scanvars(reader, frame, locals):
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48 """Scan one logical line of Python and look up values of variables used."""
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49 import tokenize, keyword
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50 vars, lasttoken, parent, prefix = [], None, None, ''
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51 for ttype, token, start, end, line in tokenize.generate_tokens(reader):
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52 if ttype == tokenize.NEWLINE: break
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53 if ttype == tokenize.NAME and token not in keyword.kwlist:
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54 if lasttoken == '.':
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55 if parent is not __UNDEF__:
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56 value = getattr(parent, token, __UNDEF__)
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57 vars.append((prefix + token, prefix, value))
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58 else:
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59 where, value = lookup(token, frame, locals)
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60 vars.append((token, where, value))
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61 elif token == '.':
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62 prefix += lasttoken + '.'
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63 parent = value
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64 else:
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65 parent, prefix = None, ''
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66 lasttoken = token
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67 return vars
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68
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69 def html((etype, evalue, etb), context=5):
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70 """Return a nice HTML document describing a given traceback."""
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71 import os, types, time, traceback, linecache, inspect, pydoc
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72
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73 if type(etype) is types.ClassType:
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74 etype = etype.__name__
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75 # XXX stuff added locally:
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76 from MoinMoin import version
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77 try:
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78 osinfo = " ".join(os.uname()) # only on UNIX
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79 except: # TODO: which error does this raise on Win/Mac?
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80 osinfo = "Platform: %s (%s)" % (sys.platform, os.name)
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81 pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
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82 date = time.ctime(time.time())
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83 versinfo = "<strong>Please include this information in your bug reports!:</strong><br>" + \
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84 "Python %s<br>" % pyver + \
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85 osinfo + '<br>' + \
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86 'MoinMoin Release %s [Revision %s]' % (version.release, version.revision)
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87 head = '<body bgcolor="#f0f0f8">' + pydoc.html.heading(
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88 '<big><big><strong>%s</strong>%s</big></big>' % (str(etype), str(evalue)),
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89 '#ffffff', '#6622aa', versinfo + '<br>' + date) + '''
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90 <p>A problem occurred in a Python script. Here is the sequence of
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91 function calls leading up to the error, in the order they occurred.'''
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92 # XXX end of local changes
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93
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94 indent = '<tt>' + small('&nbsp;' * 5) + '&nbsp;</tt>'
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95 frames = []
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96 records = inspect.getinnerframes(etb, context)
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97 for frame, file, lnum, func, lines, index in records:
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98 file = file and os.path.abspath(file) or '?'
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99 link = '<a href="file://%s">%s</a>' % (file, pydoc.html.escape(file))
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100 args, varargs, varkw, locals = inspect.getargvalues(frame)
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101 call = ''
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102 if func != '?':
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103 call = 'in ' + strong(func) + \
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104 inspect.formatargvalues(args, varargs, varkw, locals,
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105 formatvalue=lambda value: '=' + pydoc.html.repr(value))
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106
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107 highlight = {}
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108 def reader(lnum=[lnum]):
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109 highlight[lnum[0]] = 1
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110 try: return linecache.getline(file, lnum[0])
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111 finally: lnum[0] += 1
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112 vars = scanvars(reader, frame, locals)
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113
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114 rows = ['<tr><td bgcolor="#d8bbff">%s%s %s</td></tr>' %
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115 ('<big>&nbsp;</big>', link, call)]
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116 if index is not None:
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117 i = lnum - index
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
118 for line in lines:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
119 num = small('&nbsp;' * (5-len(str(i))) + str(i)) + '&nbsp;'
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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diff changeset
120 line = '<tt>%s%s</tt>' % (num, pydoc.html.preformat(line))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
121 if i in highlight:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
122 rows.append('<tr><td bgcolor="#ffccee">%s</td></tr>' % line)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
123 else:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
124 rows.append('<tr><td>%s</td></tr>' % grey(line))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
125 i += 1
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
126
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
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127 done, dump = {}, []
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
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diff changeset
128 for name, where, value in vars:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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129 if name in done: continue
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
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diff changeset
130 done[name] = 1
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
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131 if value is not __UNDEF__:
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132 if where == 'global': name = '<em>global</em> ' + strong(name)
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133 elif where == 'local': name = strong(name)
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134 else: name = where + strong(name.split('.')[-1])
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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135 dump.append('%s&nbsp;= %s' % (name, pydoc.html.repr(value)))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
136 else:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
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diff changeset
137 dump.append(name + ' <em>undefined</em>')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
138
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
139 rows.append('<tr><td>%s</td></tr>' % small(grey(', '.join(dump))))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
140 frames.append('''<p>
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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141 <table width="100%%" cellspacing=0 cellpadding=0 border=0>
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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142 %s</table>''' % '\n'.join(rows))
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diff changeset
143
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
144 exception = ['<p>%s: %s' % (strong(str(etype)), str(evalue))]
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Thomas Waldmann <tw-public@gmx.de>
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diff changeset
145 if type(evalue) is types.InstanceType:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
146 for name in dir(evalue):
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diff changeset
147 value = pydoc.html.repr(getattr(evalue, name))
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148 exception.append('\n<br>%s%s&nbsp;=\n%s' % (indent, name, value))
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diff changeset
149
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diff changeset
150 import traceback
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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151 return head + ''.join(frames) + ''.join(exception) + '''
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diff changeset
152
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
153
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
154 <!-- The above is a description of an error in a Python program, formatted
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
155 for a Web browser because the 'cgitb' module was enabled. In case you
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
156 are not reading this in a Web browser, here is the original traceback:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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diff changeset
157
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
158 %s
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
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diff changeset
159 -->
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
160 ''' % ''.join(traceback.format_exception(etype, evalue, etb))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
161
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
162 class Hook:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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diff changeset
163 """A hook to replace sys.excepthook that shows tracebacks in HTML."""
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
164
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
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diff changeset
165 def __init__(self, display=1, logdir=None, context=5, file=None):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
166 self.display = display # send tracebacks to browser if true
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
167 self.logdir = logdir # log tracebacks to files if not None
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
168 self.context = context # number of source code lines per frame
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parents:
diff changeset
169 self.file = file or sys.stdout # place to send the output
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
170
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
171 def __call__(self, etype, evalue, etb):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
172 self.handle((etype, evalue, etb))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
173
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
174 def handle(self, info=None):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
175 info = info or sys.exc_info()
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
176 self.file.write(reset())
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
177
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
178 try:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
179 text, doc = 0, html(info, self.context)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
180 except: # just in case something goes wrong
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
181 import traceback
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
182 text, doc = 1, ''.join(traceback.format_exception(*info))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
183
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
184 if self.display:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
185 if text:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
186 doc = doc.replace('&', '&amp;').replace('<', '&lt;')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
187 self.file.write('<pre>' + doc + '</pre>\n')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
188 else:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
189 self.file.write(doc + '\n')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
190 else:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
191 self.file.write('<p>A problem occurred in a Python script.\n')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
192
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
193 if self.logdir is not None:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
194 import os, tempfile
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
195 name = tempfile.mktemp(['.html', '.txt'][text])
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
196 path = os.path.join(self.logdir, os.path.basename(name))
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
197 try:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
198 file = open(path, 'w')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
199 file.write(doc)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
200 file.close()
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
201 msg = '<p> %s contains the description of this error.' % path
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
202 except:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
203 msg = '<p> Tried to save traceback to %s, but failed.' % path
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
204 self.file.write(msg + '\n')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
205 try:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
206 self.file.flush()
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
207 except: pass
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
208
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
209 handler = Hook().handle
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
210 def enable(display=1, logdir=None, context=5):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
211 """Install an exception handler that formats tracebacks as HTML.
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
212
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
213 The optional argument 'display' can be set to 0 to suppress sending the
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
214 traceback to the browser, and 'logdir' can be set to a directory to cause
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
215 tracebacks to be written to files there."""
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
216 sys.excepthook = Hook(display, logdir, context)