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Diffstat (limited to 'Lib/cgitb.py')
| -rw-r--r-- | Lib/cgitb.py | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/Lib/cgitb.py b/Lib/cgitb.py new file mode 100644 index 0000000..8084464 --- /dev/null +++ b/Lib/cgitb.py @@ -0,0 +1,182 @@ +"""Handle exceptions in CGI scripts by formatting tracebacks into nice HTML. + +To enable this module, do: + + import cgitb; cgitb.enable() + +at the top of your CGI script. The optional arguments to enable() are: + + display - if true, tracebacks are displayed in the web browser + logdir - if set, tracebacks are written to files in this directory + +By default, tracebacks are displayed but not written to files. + +Alternatively, if you have caught an exception and want cgitb to display it +for you, call cgitb.handle(). The optional argument to handle() is a 3-item +tuple (etype, evalue, etb) just like the value of sys.exc_info().""" + +__author__ = 'Ka-Ping Yee' +__version__ = '$Revision$' + +def reset(): + """Return a string that resets the CGI and browser to a known state.""" + return '''<!--: spam +Content-Type: text/html + +<body bgcolor="#f0f0ff"><font color="#f0f0ff" size="-5"> --> +<body bgcolor="#f0f0ff"><font color="#f0f0ff" size="-5"> --> --> +</font> </font> </font> </script> </object> </blockquote> </pre> +</table> </table> </table> </table> </table> </font> </font> </font>''' + +def html(etype, evalue, etb, context=5): + """Return a nice HTML document describing the traceback.""" + import sys, os, types, time, traceback + import keyword, tokenize, linecache, inspect, pydoc + + if type(etype) is types.ClassType: + etype = etype.__name__ + pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable + date = time.ctime(time.time()) + head = '<body bgcolor="#f0f0ff">' + pydoc.html.heading( + '<big><big><strong>%s</strong></big></big>' % str(etype), + '#ffffff', '#aa55cc', pyver + '<br>' + date) + ''' +<p>A problem occurred in a Python script. +Here is the sequence of function calls leading up to +the error, with the most recent (innermost) call last.''' + + indent = '<tt><small>' + ' ' * 5 + '</small> </tt>' + frames = [] + records = inspect.getinnerframes(etb, context) + for frame, file, lnum, func, lines, index in records: + file = file and os.path.abspath(file) or '?' + link = '<a href="file:%s">%s</a>' % (file, pydoc.html.escape(file)) + args, varargs, varkw, locals = inspect.getargvalues(frame) + if func == '?': + call = '' + else: + def eqrepr(value): return '=' + pydoc.html.repr(value) + call = 'in <strong>%s</strong>' % func + inspect.formatargvalues( + args, varargs, varkw, locals, formatvalue=eqrepr) + + names = [] + def tokeneater(type, token, start, end, line): + if type == tokenize.NAME and token not in keyword.kwlist: + if token not in names: names.append(token) + if type == tokenize.NEWLINE: raise IndexError + def linereader(lnum=[lnum]): + line = linecache.getline(file, lnum[0]) + lnum[0] += 1 + return line + + try: + tokenize.tokenize(linereader, tokeneater) + except IndexError: pass + lvals = [] + for name in names: + if name in frame.f_code.co_varnames: + if locals.has_key(name): + value = pydoc.html.repr(locals[name]) + else: + value = '<em>undefined</em>' + name = '<strong>%s</strong>' % name + else: + if frame.f_globals.has_key(name): + value = pydoc.html.repr(frame.f_globals[name]) + else: + value = '<em>undefined</em>' + name = '<em>global</em> <strong>%s</strong>' % name + lvals.append('%s = %s' % (name, value)) + if lvals: + lvals = indent + ''' +<small><font color="#909090">%s</font></small><br>''' % (', '.join(lvals)) + else: + lvals = '' + + level = ''' +<table width="100%%" bgcolor="#d8bbff" cellspacing=0 cellpadding=2 border=0> +<tr><td>%s %s</td></tr></table>\n''' % (link, call) + excerpt = [] + if index is not None: + i = lnum - index + for line in lines: + num = '<small><font color="#909090">%s</font></small>' % ( + ' ' * (5-len(str(i))) + str(i)) + line = '<tt>%s %s</tt>' % (num, pydoc.html.preformat(line)) + if i == lnum: + line = ''' +<table width="100%%" bgcolor="#ffccee" cellspacing=0 cellpadding=0 border=0> +<tr><td>%s</td></tr></table>\n''' % line + excerpt.append('\n' + line) + if i == lnum: + excerpt.append(lvals) + i = i + 1 + frames.append('<p>' + level + '\n'.join(excerpt)) + + exception = ['<p><strong>%s</strong>: %s' % (str(etype), str(evalue))] + if type(evalue) is types.InstanceType: + for name in dir(evalue): + value = pydoc.html.repr(getattr(evalue, name)) + exception.append('\n<br>%s%s =\n%s' % (indent, name, value)) + + import traceback + plaintrace = ''.join(traceback.format_exception(etype, evalue, etb)) + + return head + ''.join(frames) + ''.join(exception) + ''' + + +<!-- The above is a description of an error that occurred in a Python program. + It is formatted for display in a Web browser because it appears that + we are running in a CGI environment. In case you are viewing this + message outside of a Web browser, here is the original error traceback: + +%s +--> +''' % plaintrace + +class Hook: + def __init__(self, display=1, logdir=None): + self.display = display # send tracebacks to browser if true + self.logdir = logdir # log tracebacks to files if not None + + def __call__(self, etype, evalue, etb): + """This hook can replace sys.excepthook (for Python 2.1 or higher).""" + self.handle((etype, evalue, etb)) + + def handle(self, info=None): + import sys, os + info = info or sys.exc_info() + text = 0 + print reset() + + try: + doc = html(*info) + except: # just in case something goes wrong + import traceback + doc = ''.join(traceback.format_exception(*info)) + text = 1 + + if self.display: + if text: + doc = doc.replace('&', '&').replace('<', '<') + print '<pre>', doc, '</pre>' + else: + print doc + else: + print '<p>A problem occurred in a Python script.' + + if self.logdir is not None: + import tempfile + name = tempfile.mktemp(['.html', '.txt'][text]) + path = os.path.join(self.logdir, os.path.basename(name)) + try: + file = open(path, 'w') + file.write(doc) + file.close() + print '<p>%s contains the description of this error.' % path + except: + print '<p>Tried to write to %s, but failed.' % path + +handler = Hook().handle +def enable(display=1, logdir=None): + import sys + sys.excepthook = Hook(display, logdir) |