mirror of
https://github.com/python/cpython.git
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83205972a2
- file URL now starts with "file://" (standard) rather than "file:" - new optional argument 'context' to enable() - repeated variable names don't have their values shown twice - dotted attributes are shown; missing attributes handled reasonably - highlight the whole logical line even if it has multiple physical lines - use nice generator interface to tokenize - formatting fixed so that it looks good in lynx, links, and w3m too
201 lines
7.9 KiB
Python
201 lines
7.9 KiB
Python
"""Handle exceptions in CGI scripts by formatting tracebacks into nice HTML.
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To enable this module, do:
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import cgitb; cgitb.enable()
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at the top of your CGI script. The optional arguments to enable() are:
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display - if true, tracebacks are displayed in the web browser
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logdir - if set, tracebacks are written to files in this directory
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context - number of lines of source code to show for each stack frame
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By default, tracebacks are displayed but not saved, and context is 5.
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Alternatively, if you have caught an exception and want cgitb to display it
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for you, call cgitb.handle(). The optional argument to handle() is a 3-item
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tuple (etype, evalue, etb) just like the value of sys.exc_info()."""
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__author__ = 'Ka-Ping Yee'
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__version__ = '$Revision$'
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def reset():
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"""Return a string that resets the CGI and browser to a known state."""
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return '''<!--: spam
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Content-Type: text/html
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<body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> -->
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<body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --> -->
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</font> </font> </font> </script> </object> </blockquote> </pre>
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</table> </table> </table> </table> </table> </font> </font> </font>'''
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__UNDEF__ = [] # a special sentinel object
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def small(text): return '<small>' + text + '</small>'
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def strong(text): return '<strong>' + text + '</strong>'
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def grey(text): return '<font color="#909090">' + text + '</font>'
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def lookup(name, frame, locals):
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"""Find the value for a given name in the given environment."""
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if name in locals:
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return 'local', locals[name]
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if name in frame.f_globals:
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return 'global', frame.f_globals[name]
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return None, __UNDEF__
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def scanvars(reader, frame, locals):
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"""Scan one logical line of Python and look up values of variables used."""
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import tokenize, keyword
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vars, lasttoken, parent, prefix = [], None, None, ''
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for ttype, token, start, end, line in tokenize.generate_tokens(reader):
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if ttype == tokenize.NEWLINE: break
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if ttype == tokenize.NAME and token not in keyword.kwlist:
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if lasttoken == '.':
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if parent is not __UNDEF__:
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value = getattr(parent, token, __UNDEF__)
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vars.append((prefix + token, prefix, value))
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else:
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where, value = lookup(token, frame, locals)
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vars.append((token, where, value))
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elif token == '.':
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prefix += lasttoken + '.'
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parent = value
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else:
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parent, prefix = None, ''
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lasttoken = token
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return vars
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def html((etype, evalue, etb), context=5):
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"""Return a nice HTML document describing a given traceback."""
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import sys, os, types, time, traceback, linecache, inspect, pydoc
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if type(etype) is types.ClassType:
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etype = etype.__name__
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pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
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date = time.ctime(time.time())
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head = '<body bgcolor="#f0f0f8">' + pydoc.html.heading(
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'<big><big><strong>%s</strong></big></big>' % str(etype),
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'#ffffff', '#6622aa', pyver + '<br>' + date) + '''
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<p>A problem occurred in a Python script. Here is the sequence of
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function calls leading up to the error, in the order they occurred.'''
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indent = '<tt>' + small(' ' * 5) + ' </tt>'
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frames = []
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records = inspect.getinnerframes(etb, context)
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for frame, file, lnum, func, lines, index in records:
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file = file and os.path.abspath(file) or '?'
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link = '<a href="file://%s">%s</a>' % (file, pydoc.html.escape(file))
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args, varargs, varkw, locals = inspect.getargvalues(frame)
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call = ''
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if func != '?':
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call = 'in ' + strong(func) + \
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inspect.formatargvalues(args, varargs, varkw, locals,
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formatvalue=lambda value: '=' + pydoc.html.repr(value))
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highlight = {}
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def reader(lnum=[lnum]):
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highlight[lnum[0]] = 1
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try: return linecache.getline(file, lnum[0])
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finally: lnum[0] += 1
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vars = scanvars(reader, frame, locals)
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rows = ['<tr><td bgcolor="#d8bbff">%s%s %s</td></tr>' %
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('<big> </big>', link, call)]
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if index is not None:
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i = lnum - index
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for line in lines:
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num = small(' ' * (5-len(str(i))) + str(i)) + ' '
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line = '<tt>%s%s</tt>' % (num, pydoc.html.preformat(line))
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if i in highlight:
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rows.append('<tr><td bgcolor="#ffccee">%s</td></tr>' % line)
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else:
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rows.append('<tr><td>%s</td></tr>' % grey(line))
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i += 1
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done, dump = {}, []
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for name, where, value in vars:
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if name in done: continue
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done[name] = 1
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if value is not __UNDEF__:
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if where == 'global': name = '<em>global</em> ' + strong(name)
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elif where == 'local': name = strong(name)
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else: name = where + strong(name.split('.')[-1])
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dump.append('%s = %s' % (name, pydoc.html.repr(value)))
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else:
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dump.append(name + ' <em>undefined</em>')
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rows.append('<tr><td>%s</td></tr>' % small(grey(', '.join(dump))))
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frames.append('''<p>
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<table width="100%%" cellspacing=0 cellpadding=0 border=0>
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%s</table>''' % '\n'.join(rows))
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exception = ['<p>%s: %s' % (strong(str(etype)), str(evalue))]
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if type(evalue) is types.InstanceType:
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for name in dir(evalue):
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value = pydoc.html.repr(getattr(evalue, name))
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exception.append('\n<br>%s%s =\n%s' % (indent, name, value))
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import traceback
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return head + ''.join(frames) + ''.join(exception) + '''
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<!-- The above is a description of an error in a Python program, formatted
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for a Web browser because the 'cgitb' module was enabled. In case you
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are not reading this in a Web browser, here is the original traceback:
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%s
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-->
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''' % ''.join(traceback.format_exception(etype, evalue, etb))
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class Hook:
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"""A hook to replace sys.excepthook that shows tracebacks in HTML."""
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def __init__(self, display=1, logdir=None, context=5):
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self.display = display # send tracebacks to browser if true
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self.logdir = logdir # log tracebacks to files if not None
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self.context = context # number of source code lines per frame
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def __call__(self, etype, evalue, etb):
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self.handle((etype, evalue, etb))
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def handle(self, info=None):
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import sys
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info = info or sys.exc_info()
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print reset()
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try:
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text, doc = 0, html(info, self.context)
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except: # just in case something goes wrong
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import traceback
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text, doc = 1, ''.join(traceback.format_exception(*info))
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if self.display:
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if text:
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doc = doc.replace('&', '&').replace('<', '<')
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print '<pre>' + doc + '</pre>'
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else:
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print doc
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else:
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print '<p>A problem occurred in a Python script.'
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if self.logdir is not None:
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import os, tempfile
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name = tempfile.mktemp(['.html', '.txt'][text])
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path = os.path.join(self.logdir, os.path.basename(name))
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try:
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file = open(path, 'w')
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file.write(doc)
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file.close()
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print '<p> %s contains the description of this error.' % path
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except:
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print '<p> Tried to save traceback to %s, but failed.' % path
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handler = Hook().handle
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def enable(display=1, logdir=None, context=5):
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"""Install an exception handler that formats tracebacks as HTML.
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The optional argument 'display' can be set to 0 to suppress sending the
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traceback to the browser, and 'logdir' can be set to a directory to cause
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tracebacks to be written to files there."""
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import sys
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sys.excepthook = Hook(display, logdir, context)
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