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gerrit-public.fairphone.software / platform / external / python / cpython2 / 18a818bc63d993c3d3433f69cf2b7d2b9bd63ebf / . / Lib / cgitb.py
blob: 35f4a50d5f5729acc6153e853dec08e3757ad8fa [file] [log] [blame]
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]1"""More comprehensive traceback formatting for Python scripts.
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]2
3To enable this module, do:
4
5 import cgitb; cgitb.enable()
6
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]7at the top of your script. The optional arguments to enable() are:
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]8
9 display - if true, tracebacks are displayed in the web browser
10 logdir - if set, tracebacks are written to files in this directory
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]11 context - number of lines of source code to show for each stack frame
Tim Peters478c1052003-06-29 05:46:54 +0000[diff] [blame]12 format - 'text' or 'html' controls the output format
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]13
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]14By default, tracebacks are displayed but not saved, the context is 5 lines
15and the output format is 'html' (for backwards compatibility with the
16original use of this module)
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]17
18Alternatively, if you have caught an exception and want cgitb to display it
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]19for you, call cgitb.handler(). The optional argument to handler() is a
203-item tuple (etype, evalue, etb) just like the value of sys.exc_info().
21The default handler displays output as HTML.
Brett Cannonad078a02009-04-01 16:00:34 +0000[diff] [blame]22
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]23"""
Brett Cannonad078a02009-04-01 16:00:34 +0000[diff] [blame]24import inspect
25import keyword
26import linecache
27import os
28import pydoc
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]29import sys
Brett Cannonad078a02009-04-01 16:00:34 +0000[diff] [blame]30import tempfile
31import time
32import tokenize
33import traceback
34import types
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]35
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]36def reset():
37 """Return a string that resets the CGI and browser to a known state."""
38 return '''<!--: spam
39Content-Type: text/html
40
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]41<body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> -->
42<body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --> -->
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]43</font> </font> </font> </script> </object> </blockquote> </pre>
44</table> </table> </table> </table> </table> </font> </font> </font>'''
45
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]46__UNDEF__ = [] # a special sentinel object
Andrew M. Kuchling5fcefdb2004-07-10 14:14:51 +0000[diff] [blame]47def small(text):
48 if text:
49 return '<small>' + text + '</small>'
50 else:
51 return ''
Tim Peters182b5ac2004-07-18 06:16:08 +0000[diff] [blame]52
Andrew M. Kuchling5fcefdb2004-07-10 14:14:51 +0000[diff] [blame]53def strong(text):
54 if text:
55 return '<strong>' + text + '</strong>'
56 else:
57 return ''
Tim Peters182b5ac2004-07-18 06:16:08 +0000[diff] [blame]58
Andrew M. Kuchling5fcefdb2004-07-10 14:14:51 +0000[diff] [blame]59def grey(text):
60 if text:
61 return '<font color="#909090">' + text + '</font>'
62 else:
63 return ''
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]64
65def lookup(name, frame, locals):
66 """Find the value for a given name in the given environment."""
67 if name in locals:
68 return 'local', locals[name]
69 if name in frame.f_globals:
70 return 'global', frame.f_globals[name]
Ka-Ping Yee711cad72002-06-26 07:10:56 +0000[diff] [blame]71 if '__builtins__' in frame.f_globals:
72 builtins = frame.f_globals['__builtins__']
73 if type(builtins) is type({}):
74 if name in builtins:
75 return 'builtin', builtins[name]
76 else:
77 if hasattr(builtins, name):
78 return 'builtin', getattr(builtins, name)
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]79 return None, __UNDEF__
80
81def scanvars(reader, frame, locals):
82 """Scan one logical line of Python and look up values of variables used."""
Andrew M. Kuchling26f6bdf2004-06-05 19:15:34 +0000[diff] [blame]83 vars, lasttoken, parent, prefix, value = [], None, None, '', __UNDEF__
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]84 for ttype, token, start, end, line in tokenize.generate_tokens(reader):
85 if ttype == tokenize.NEWLINE: break
86 if ttype == tokenize.NAME and token not in keyword.kwlist:
87 if lasttoken == '.':
88 if parent is not __UNDEF__:
89 value = getattr(parent, token, __UNDEF__)
90 vars.append((prefix + token, prefix, value))
91 else:
92 where, value = lookup(token, frame, locals)
93 vars.append((token, where, value))
94 elif token == '.':
95 prefix += lasttoken + '.'
96 parent = value
97 else:
98 parent, prefix = None, ''
99 lasttoken = token
100 return vars
101
102def html((etype, evalue, etb), context=5):
103 """Return a nice HTML document describing a given traceback."""
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]104 if type(etype) is types.ClassType:
105 etype = etype.__name__
106 pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
107 date = time.ctime(time.time())
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]108 head = '<body bgcolor="#f0f0f8">' + pydoc.html.heading(
Andrew M. Kuchling5fcefdb2004-07-10 14:14:51 +0000[diff] [blame]109 '<big><big>%s</big></big>' %
110 strong(pydoc.html.escape(str(etype))),
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]111 '#ffffff', '#6622aa', pyver + '<br>' + date) + '''
112<p>A problem occurred in a Python script. Here is the sequence of
Andrew M. Kuchling5fcefdb2004-07-10 14:14:51 +0000[diff] [blame]113function calls leading up to the error, in the order they occurred.</p>'''
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]114
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]115 indent = '<tt>' + small('&nbsp;' * 5) + '&nbsp;</tt>'
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]116 frames = []
117 records = inspect.getinnerframes(etb, context)
118 for frame, file, lnum, func, lines, index in records:
Georg Brandl07c81d92005-06-26 21:57:55 +0000[diff] [blame]119 if file:
120 file = os.path.abspath(file)
121 link = '<a href="file://%s">%s</a>' % (file, pydoc.html.escape(file))
122 else:
123 file = link = '?'
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]124 args, varargs, varkw, locals = inspect.getargvalues(frame)
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]125 call = ''
126 if func != '?':
127 call = 'in ' + strong(func) + \
128 inspect.formatargvalues(args, varargs, varkw, locals,
129 formatvalue=lambda value: '=' + pydoc.html.repr(value))
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]130
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]131 highlight = {}
132 def reader(lnum=[lnum]):
133 highlight[lnum[0]] = 1
134 try: return linecache.getline(file, lnum[0])
135 finally: lnum[0] += 1
136 vars = scanvars(reader, frame, locals)
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]137
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]138 rows = ['<tr><td bgcolor="#d8bbff">%s%s %s</td></tr>' %
139 ('<big>&nbsp;</big>', link, call)]
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]140 if index is not None:
141 i = lnum - index
142 for line in lines:
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]143 num = small('&nbsp;' * (5-len(str(i))) + str(i)) + '&nbsp;'
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]144 if i in highlight:
Georg Brandl7ab5eb92009-04-05 18:34:58 +0000[diff] [blame]145 line = '<tt>=&gt;%s%s</tt>' % (num, pydoc.html.preformat(line))
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]146 rows.append('<tr><td bgcolor="#ffccee">%s</td></tr>' % line)
147 else:
Georg Brandl7ab5eb92009-04-05 18:34:58 +0000[diff] [blame]148 line = '<tt>&nbsp;&nbsp;%s%s</tt>' % (num, pydoc.html.preformat(line))
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]149 rows.append('<tr><td>%s</td></tr>' % grey(line))
150 i += 1
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]151
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]152 done, dump = {}, []
153 for name, where, value in vars:
154 if name in done: continue
155 done[name] = 1
156 if value is not __UNDEF__:
Raymond Hettingerdbecd932005-02-06 06:57:08 +0000[diff] [blame]157 if where in ('global', 'builtin'):
Ka-Ping Yee711cad72002-06-26 07:10:56 +0000[diff] [blame]158 name = ('<em>%s</em> ' % where) + strong(name)
159 elif where == 'local':
160 name = strong(name)
161 else:
162 name = where + strong(name.split('.')[-1])
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]163 dump.append('%s&nbsp;= %s' % (name, pydoc.html.repr(value)))
164 else:
165 dump.append(name + ' <em>undefined</em>')
166
167 rows.append('<tr><td>%s</td></tr>' % small(grey(', '.join(dump))))
Andrew M. Kuchling5fcefdb2004-07-10 14:14:51 +0000[diff] [blame]168 frames.append('''
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]169<table width="100%%" cellspacing=0 cellpadding=0 border=0>
170%s</table>''' % '\n'.join(rows))
171
Andrew M. Kuchlingb67c9432004-03-31 20:17:56 +0000[diff] [blame]172 exception = ['<p>%s: %s' % (strong(pydoc.html.escape(str(etype))),
173 pydoc.html.escape(str(evalue)))]
Georg Brandl135c3172007-04-11 19:25:11 +0000[diff] [blame]174 if isinstance(evalue, BaseException):
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]175 for name in dir(evalue):
Ka-Ping Yee711cad72002-06-26 07:10:56 +0000[diff] [blame]176 if name[:1] == '_': continue
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]177 value = pydoc.html.repr(getattr(evalue, name))
178 exception.append('\n<br>%s%s&nbsp;=\n%s' % (indent, name, value))
179
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]180 return head + ''.join(frames) + ''.join(exception) + '''
181
182
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]183<!-- The above is a description of an error in a Python program, formatted
184 for a Web browser because the 'cgitb' module was enabled. In case you
185 are not reading this in a Web browser, here is the original traceback:
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]186
187%s
188-->
Georg Brandla09a96a2007-05-15 20:19:34 +0000[diff] [blame]189''' % pydoc.html.escape(
190 ''.join(traceback.format_exception(etype, evalue, etb)))
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]191
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]192def text((etype, evalue, etb), context=5):
193 """Return a plain text document describing a given traceback."""
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]194 if type(etype) is types.ClassType:
195 etype = etype.__name__
196 pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
197 date = time.ctime(time.time())
198 head = "%s\n%s\n%s\n" % (str(etype), pyver, date) + '''
199A problem occurred in a Python script. Here is the sequence of
200function calls leading up to the error, in the order they occurred.
201'''
202
203 frames = []
204 records = inspect.getinnerframes(etb, context)
205 for frame, file, lnum, func, lines, index in records:
206 file = file and os.path.abspath(file) or '?'
207 args, varargs, varkw, locals = inspect.getargvalues(frame)
208 call = ''
209 if func != '?':
210 call = 'in ' + func + \
211 inspect.formatargvalues(args, varargs, varkw, locals,
212 formatvalue=lambda value: '=' + pydoc.text.repr(value))
213
214 highlight = {}
215 def reader(lnum=[lnum]):
216 highlight[lnum[0]] = 1
217 try: return linecache.getline(file, lnum[0])
218 finally: lnum[0] += 1
219 vars = scanvars(reader, frame, locals)
220
221 rows = [' %s %s' % (file, call)]
222 if index is not None:
223 i = lnum - index
224 for line in lines:
225 num = '%5d ' % i
226 rows.append(num+line.rstrip())
227 i += 1
228
229 done, dump = {}, []
230 for name, where, value in vars:
231 if name in done: continue
232 done[name] = 1
233 if value is not __UNDEF__:
234 if where == 'global': name = 'global ' + name
Skip Montanaro1c0228a2004-06-07 11:20:40 +0000[diff] [blame]235 elif where != 'local': name = where + name.split('.')[-1]
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]236 dump.append('%s = %s' % (name, pydoc.text.repr(value)))
237 else:
238 dump.append(name + ' undefined')
239
240 rows.append('\n'.join(dump))
241 frames.append('\n%s\n' % '\n'.join(rows))
242
243 exception = ['%s: %s' % (str(etype), str(evalue))]
Georg Brandl135c3172007-04-11 19:25:11 +0000[diff] [blame]244 if isinstance(evalue, BaseException):
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]245 for name in dir(evalue):
246 value = pydoc.text.repr(getattr(evalue, name))
247 exception.append('\n%s%s = %s' % (" "*4, name, value))
248
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]249 return head + ''.join(frames) + ''.join(exception) + '''
250
251The above is a description of an error in a Python program. Here is
252the original traceback:
253
254%s
255''' % ''.join(traceback.format_exception(etype, evalue, etb))
256
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]257class Hook:
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]258 """A hook to replace sys.excepthook that shows tracebacks in HTML."""
259
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]260 def __init__(self, display=1, logdir=None, context=5, file=None,
261 format="html"):
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]262 self.display = display # send tracebacks to browser if true
263 self.logdir = logdir # log tracebacks to files if not None
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]264 self.context = context # number of source code lines per frame
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]265 self.file = file or sys.stdout # place to send the output
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]266 self.format = format
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]267
268 def __call__(self, etype, evalue, etb):
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]269 self.handle((etype, evalue, etb))
270
271 def handle(self, info=None):
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]272 info = info or sys.exc_info()
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]273 if self.format == "html":
274 self.file.write(reset())
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]275
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]276 formatter = (self.format=="html") and html or text
277 plain = False
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]278 try:
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]279 doc = formatter(info, self.context)
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]280 except: # just in case something goes wrong
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]281 doc = ''.join(traceback.format_exception(*info))
282 plain = True
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]283
284 if self.display:
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]285 if plain:
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]286 doc = doc.replace('&', '&amp;').replace('<', '&lt;')
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]287 self.file.write('<pre>' + doc + '</pre>\n')
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]288 else:
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]289 self.file.write(doc + '\n')
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]290 else:
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]291 self.file.write('<p>A problem occurred in a Python script.\n')
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]292
293 if self.logdir is not None:
Andrew M. Kuchling30633c92004-05-06 13:13:44 +0000[diff] [blame]294 suffix = ['.txt', '.html'][self.format=="html"]
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]295 (fd, path) = tempfile.mkstemp(suffix=suffix, dir=self.logdir)
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]296 try:
Guido van Rossum3b0a3292002-08-09 16:38:32 +0000[diff] [blame]297 file = os.fdopen(fd, 'w')
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]298 file.write(doc)
299 file.close()
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]300 msg = '<p> %s contains the description of this error.' % path
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]301 except:
Ka-Ping Yeefa78d0f2001-12-04 18:45:17 +0000[diff] [blame]302 msg = '<p> Tried to save traceback to %s, but failed.' % path
303 self.file.write(msg + '\n')
304 try:
305 self.file.flush()
306 except: pass
Ka-Ping Yee6b5a48d2001-08-18 04:04:50 +0000[diff] [blame]307
308handler = Hook().handle
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]309def enable(display=1, logdir=None, context=5, format="html"):
Ka-Ping Yee83205972001-08-21 06:53:01 +0000[diff] [blame]310 """Install an exception handler that formats tracebacks as HTML.
311
312 The optional argument 'display' can be set to 0 to suppress sending the
313 traceback to the browser, and 'logdir' can be set to a directory to cause
314 tracebacks to be written to files there."""
Skip Montanaro364ca402003-06-17 12:58:31 +0000[diff] [blame]315 sys.excepthook = Hook(display=display, logdir=logdir,
316 context=context, format=format)