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cgitb.py11.8 KB · 322 lines
"""More comprehensive traceback formatting for Python scripts. To enable this module, do:     import cgitb; cgitb.enable() at the top of your 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    context     - number of lines of source code to show for each stack frame    format      - 'text' or 'html' controls the output format By default, tracebacks are displayed but not saved, the context is 5 linesand the output format is 'html' (for backwards compatibility with theoriginal use of this module) Alternatively, if you have caught an exception and want cgitb to display itfor you, call cgitb.handler().  The optional argument to handler() is a3-item tuple (etype, evalue, etb) just like the value of sys.exc_info().The default handler displays output as HTML. """import inspectimport keywordimport linecacheimport osimport pydocimport sysimport tempfileimport timeimport tokenizeimport traceback def reset():    """Return a string that resets the CGI and browser to a known state."""    return '''<!--: spamContent-Type: text/html <body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --><body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --> --></font> </font> </font> </script> </object> </blockquote> </pre></table> </table> </table> </table> </table> </font> </font> </font>''' __UNDEF__ = []                          # a special sentinel objectdef small(text):    if text:        return '<small>' + text + '</small>'    else:        return '' def strong(text):    if text:        return '<strong>' + text + '</strong>'    else:        return '' def grey(text):    if text:        return '<font color="#909090">' + text + '</font>'    else:        return '' def lookup(name, frame, locals):    """Find the value for a given name in the given environment."""    if name in locals:        return 'local', locals[name]    if name in frame.f_globals:        return 'global', frame.f_globals[name]    if '__builtins__' in frame.f_globals:        builtins = frame.f_globals['__builtins__']        if type(builtins) is type({}):            if name in builtins:                return 'builtin', builtins[name]        else:            if hasattr(builtins, name):                return 'builtin', getattr(builtins, name)    return None, __UNDEF__ def scanvars(reader, frame, locals):    """Scan one logical line of Python and look up values of variables used."""    vars, lasttoken, parent, prefix, value = [], None, None, '', __UNDEF__    for ttype, token, start, end, line in tokenize.generate_tokens(reader):        if ttype == tokenize.NEWLINE: break        if ttype == tokenize.NAME and token not in keyword.kwlist:            if lasttoken == '.':                if parent is not __UNDEF__:                    value = getattr(parent, token, __UNDEF__)                    vars.append((prefix + token, prefix, value))            else:                where, value = lookup(token, frame, locals)                vars.append((token, where, value))        elif token == '.':            prefix += lasttoken + '.'            parent = value        else:            parent, prefix = None, ''        lasttoken = token    return vars def html(einfo, context=5):    """Return a nice HTML document describing a given traceback."""    etype, evalue, etb = einfo    if isinstance(etype, type):        etype = etype.__name__    pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable    date = time.ctime(time.time())    head = '<body bgcolor="#f0f0f8">' + pydoc.html.heading(        '<big><big>%s</big></big>' %        strong(pydoc.html.escape(str(etype))),        '#ffffff', '#6622aa', pyver + '<br>' + date) + '''<p>A problem occurred in a Python script.  Here is the sequence offunction calls leading up to the error, in the order they occurred.</p>'''     indent = '<tt>' + small('&nbsp;' * 5) + '&nbsp;</tt>'    frames = []    records = inspect.getinnerframes(etb, context)    for frame, file, lnum, func, lines, index in records:        if file:            file = os.path.abspath(file)            link = '<a href="file://%s">%s</a>' % (file, pydoc.html.escape(file))        else:            file = link = '?'        args, varargs, varkw, locals = inspect.getargvalues(frame)        call = ''        if func != '?':            call = 'in ' + strong(pydoc.html.escape(func))            if func != "<module>":                call += inspect.formatargvalues(args, varargs, varkw, locals,                    formatvalue=lambda value: '=' + pydoc.html.repr(value))         highlight = {}        def reader(lnum=[lnum]):            highlight[lnum[0]] = 1            try: return linecache.getline(file, lnum[0])            finally: lnum[0] += 1        vars = scanvars(reader, frame, locals)         rows = ['<tr><td bgcolor="#d8bbff">%s%s %s</td></tr>' %                ('<big>&nbsp;</big>', link, call)]        if index is not None:            i = lnum - index            for line in lines:                num = small('&nbsp;' * (5-len(str(i))) + str(i)) + '&nbsp;'                if i in highlight:                    line = '<tt>=&gt;%s%s</tt>' % (num, pydoc.html.preformat(line))                    rows.append('<tr><td bgcolor="#ffccee">%s</td></tr>' % line)                else:                    line = '<tt>&nbsp;&nbsp;%s%s</tt>' % (num, pydoc.html.preformat(line))                    rows.append('<tr><td>%s</td></tr>' % grey(line))                i += 1         done, dump = {}, []        for name, where, value in vars:            if name in done: continue            done[name] = 1            if value is not __UNDEF__:                if where in ('global', 'builtin'):                    name = ('<em>%s</em> ' % where) + strong(name)                elif where == 'local':                    name = strong(name)                else:                    name = where + strong(name.split('.')[-1])                dump.append('%s&nbsp;= %s' % (name, pydoc.html.repr(value)))            else:                dump.append(name + ' <em>undefined</em>')         rows.append('<tr><td>%s</td></tr>' % small(grey(', '.join(dump))))        frames.append('''<table width="100%%" cellspacing=0 cellpadding=0 border=0>%s</table>''' % '\n'.join(rows))     exception = ['<p>%s: %s' % (strong(pydoc.html.escape(str(etype))),                                pydoc.html.escape(str(evalue)))]    for name in dir(evalue):        if name[:1] == '_': continue        value = pydoc.html.repr(getattr(evalue, name))        exception.append('\n<br>%s%s&nbsp;=\n%s' % (indent, name, value))     return head + ''.join(frames) + ''.join(exception) + '''  <!-- The above is a description of an error in a Python program, formatted     for a Web browser because the 'cgitb' module was enabled.  In case you     are not reading this in a Web browser, here is the original traceback: %s-->''' % pydoc.html.escape(          ''.join(traceback.format_exception(etype, evalue, etb))) def text(einfo, context=5):    """Return a plain text document describing a given traceback."""    etype, evalue, etb = einfo    if isinstance(etype, type):        etype = etype.__name__    pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable    date = time.ctime(time.time())    head = "%s\n%s\n%s\n" % (str(etype), pyver, date) + '''A problem occurred in a Python script.  Here is the sequence offunction calls leading up to the error, in the order they occurred.'''     frames = []    records = inspect.getinnerframes(etb, context)    for frame, file, lnum, func, lines, index in records:        file = file and os.path.abspath(file) or '?'        args, varargs, varkw, locals = inspect.getargvalues(frame)        call = ''        if func != '?':            call = 'in ' + func            if func != "<module>":                call += inspect.formatargvalues(args, varargs, varkw, locals,                    formatvalue=lambda value: '=' + pydoc.text.repr(value))         highlight = {}        def reader(lnum=[lnum]):            highlight[lnum[0]] = 1            try: return linecache.getline(file, lnum[0])            finally: lnum[0] += 1        vars = scanvars(reader, frame, locals)         rows = [' %s %s' % (file, call)]        if index is not None:            i = lnum - index            for line in lines:                num = '%5d ' % i                rows.append(num+line.rstrip())                i += 1         done, dump = {}, []        for name, where, value in vars:            if name in done: continue            done[name] = 1            if value is not __UNDEF__:                if where == 'global': name = 'global ' + name                elif where != 'local': name = where + name.split('.')[-1]                dump.append('%s = %s' % (name, pydoc.text.repr(value)))            else:                dump.append(name + ' undefined')         rows.append('\n'.join(dump))        frames.append('\n%s\n' % '\n'.join(rows))     exception = ['%s: %s' % (str(etype), str(evalue))]    for name in dir(evalue):        value = pydoc.text.repr(getattr(evalue, name))        exception.append('\n%s%s = %s' % (" "*4, name, value))     return head + ''.join(frames) + ''.join(exception) + ''' The above is a description of an error in a Python program.  Here isthe original traceback: %s''' % ''.join(traceback.format_exception(etype, evalue, etb)) class Hook:    """A hook to replace sys.excepthook that shows tracebacks in HTML."""     def __init__(self, display=1, logdir=None, context=5, file=None,                 format="html"):        self.display = display          # send tracebacks to browser if true        self.logdir = logdir            # log tracebacks to files if not None        self.context = context          # number of source code lines per frame        self.file = file or sys.stdout  # place to send the output        self.format = format     def __call__(self, etype, evalue, etb):        self.handle((etype, evalue, etb))     def handle(self, info=None):        info = info or sys.exc_info()        if self.format == "html":            self.file.write(reset())         formatter = (self.format=="html") and html or text        plain = False        try:            doc = formatter(info, self.context)        except:                         # just in case something goes wrong            doc = ''.join(traceback.format_exception(*info))            plain = True         if self.display:            if plain:                doc = pydoc.html.escape(doc)                self.file.write('<pre>' + doc + '</pre>\n')            else:                self.file.write(doc + '\n')        else:            self.file.write('<p>A problem occurred in a Python script.\n')         if self.logdir is not None:            suffix = ['.txt', '.html'][self.format=="html"]            (fd, path) = tempfile.mkstemp(suffix=suffix, dir=self.logdir)             try:                with os.fdopen(fd, 'w') as file:                    file.write(doc)                msg = '%s contains the description of this error.' % path            except:                msg = 'Tried to save traceback to %s, but failed.' % path             if self.format == 'html':                self.file.write('<p>%s</p>\n' % msg)            else:                self.file.write(msg + '\n')        try:            self.file.flush()        except: pass handler = Hook().handledef enable(display=1, logdir=None, context=5, format="html"):    """Install an exception handler that formats tracebacks as HTML.     The optional argument 'display' can be set to 0 to suppress sending the    traceback to the browser, and 'logdir' can be set to a directory to cause    tracebacks to be written to files there."""    sys.excepthook = Hook(display=display, logdir=logdir,                          context=context, format=format)