509 lines
16 KiB
Python
509 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug.debug.tbtools
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~~~~~~~~~~~~~~~~~~~~~~
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This module provides various traceback related utility functions.
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:copyright: (c) 2013 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD.
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"""
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import re
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import os
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import sys
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import json
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import inspect
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import traceback
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import codecs
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from tokenize import TokenError
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from werkzeug.utils import cached_property, escape
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from werkzeug.debug.console import Console
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from werkzeug._compat import range_type, PY2, text_type, string_types
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_coding_re = re.compile(r'coding[:=]\s*([-\w.]+)')
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_line_re = re.compile(r'^(.*?)$(?m)')
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_funcdef_re = re.compile(r'^(\s*def\s)|(.*(?<!\w)lambda(:|\s))|^(\s*@)')
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UTF8_COOKIE = '\xef\xbb\xbf'
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system_exceptions = (SystemExit, KeyboardInterrupt)
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try:
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system_exceptions += (GeneratorExit,)
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except NameError:
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pass
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HEADER = u'''\
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>%(title)s // Werkzeug Debugger</title>
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<link rel="stylesheet" href="?__debugger__=yes&cmd=resource&f=style.css" type="text/css">
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<!-- We need to make sure this has a favicon so that the debugger does not by
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accident trigger a request to /favicon.ico which might change the application
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state. -->
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<link rel="shortcut icon" href="?__debugger__=yes&cmd=resource&f=console.png">
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<script type="text/javascript" src="?__debugger__=yes&cmd=resource&f=jquery.js"></script>
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<script type="text/javascript" src="?__debugger__=yes&cmd=resource&f=debugger.js"></script>
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<script type="text/javascript">
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var TRACEBACK = %(traceback_id)d,
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CONSOLE_MODE = %(console)s,
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EVALEX = %(evalex)s,
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SECRET = "%(secret)s";
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</script>
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</head>
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<body>
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<div class="debugger">
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'''
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FOOTER = u'''\
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<div class="footer">
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Brought to you by <strong class="arthur">DON'T PANIC</strong>, your
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friendly Werkzeug powered traceback interpreter.
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</div>
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</div>
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</body>
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</html>
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'''
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PAGE_HTML = HEADER + u'''\
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<h1>%(exception_type)s</h1>
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<div class="detail">
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<p class="errormsg">%(exception)s</p>
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</div>
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<h2 class="traceback">Traceback <em>(most recent call last)</em></h2>
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%(summary)s
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<div class="plain">
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<form action="/?__debugger__=yes&cmd=paste" method="post">
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<p>
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<input type="hidden" name="language" value="pytb">
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This is the Copy/Paste friendly version of the traceback. <span
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class="pastemessage">You can also paste this traceback into
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a <a href="https://gist.github.com/">gist</a>:
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<input type="submit" value="create paste"></span>
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</p>
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<textarea cols="50" rows="10" name="code" readonly>%(plaintext)s</textarea>
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</form>
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</div>
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<div class="explanation">
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The debugger caught an exception in your WSGI application. You can now
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look at the traceback which led to the error. <span class="nojavascript">
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If you enable JavaScript you can also use additional features such as code
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execution (if the evalex feature is enabled), automatic pasting of the
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exceptions and much more.</span>
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</div>
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''' + FOOTER + '''
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<!--
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%(plaintext_cs)s
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-->
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'''
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CONSOLE_HTML = HEADER + u'''\
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<h1>Interactive Console</h1>
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<div class="explanation">
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In this console you can execute Python expressions in the context of the
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application. The initial namespace was created by the debugger automatically.
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</div>
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<div class="console"><div class="inner">The Console requires JavaScript.</div></div>
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''' + FOOTER
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SUMMARY_HTML = u'''\
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<div class="%(classes)s">
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%(title)s
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<ul>%(frames)s</ul>
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%(description)s
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</div>
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'''
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FRAME_HTML = u'''\
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<div class="frame" id="frame-%(id)d">
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<h4>File <cite class="filename">"%(filename)s"</cite>,
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line <em class="line">%(lineno)s</em>,
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in <code class="function">%(function_name)s</code></h4>
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<pre>%(current_line)s</pre>
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</div>
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'''
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SOURCE_TABLE_HTML = u'<table class=source>%s</table>'
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SOURCE_LINE_HTML = u'''\
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<tr class="%(classes)s">
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<td class=lineno>%(lineno)s</td>
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<td>%(code)s</td>
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</tr>
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'''
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def render_console_html(secret):
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return CONSOLE_HTML % {
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'evalex': 'true',
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'console': 'true',
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'title': 'Console',
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'secret': secret,
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'traceback_id': -1
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}
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def get_current_traceback(ignore_system_exceptions=False,
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show_hidden_frames=False, skip=0):
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"""Get the current exception info as `Traceback` object. Per default
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calling this method will reraise system exceptions such as generator exit,
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system exit or others. This behavior can be disabled by passing `False`
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to the function as first parameter.
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"""
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exc_type, exc_value, tb = sys.exc_info()
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if ignore_system_exceptions and exc_type in system_exceptions:
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raise
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for x in range_type(skip):
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if tb.tb_next is None:
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break
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tb = tb.tb_next
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tb = Traceback(exc_type, exc_value, tb)
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if not show_hidden_frames:
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tb.filter_hidden_frames()
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return tb
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class Line(object):
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"""Helper for the source renderer."""
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__slots__ = ('lineno', 'code', 'in_frame', 'current')
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def __init__(self, lineno, code):
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self.lineno = lineno
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self.code = code
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self.in_frame = False
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self.current = False
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def classes(self):
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rv = ['line']
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if self.in_frame:
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rv.append('in-frame')
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if self.current:
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rv.append('current')
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return rv
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classes = property(classes)
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def render(self):
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return SOURCE_LINE_HTML % {
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'classes': u' '.join(self.classes),
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'lineno': self.lineno,
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'code': escape(self.code)
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}
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class Traceback(object):
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"""Wraps a traceback."""
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def __init__(self, exc_type, exc_value, tb):
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self.exc_type = exc_type
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self.exc_value = exc_value
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if not isinstance(exc_type, str):
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exception_type = exc_type.__name__
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if exc_type.__module__ not in ('__builtin__', 'exceptions'):
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exception_type = exc_type.__module__ + '.' + exception_type
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else:
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exception_type = exc_type
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self.exception_type = exception_type
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# we only add frames to the list that are not hidden. This follows
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# the the magic variables as defined by paste.exceptions.collector
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self.frames = []
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while tb:
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self.frames.append(Frame(exc_type, exc_value, tb))
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tb = tb.tb_next
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def filter_hidden_frames(self):
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"""Remove the frames according to the paste spec."""
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if not self.frames:
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return
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new_frames = []
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hidden = False
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for frame in self.frames:
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hide = frame.hide
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if hide in ('before', 'before_and_this'):
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new_frames = []
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hidden = False
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if hide == 'before_and_this':
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continue
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elif hide in ('reset', 'reset_and_this'):
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hidden = False
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if hide == 'reset_and_this':
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continue
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elif hide in ('after', 'after_and_this'):
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hidden = True
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if hide == 'after_and_this':
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continue
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elif hide or hidden:
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continue
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new_frames.append(frame)
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# if we only have one frame and that frame is from the codeop
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# module, remove it.
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if len(new_frames) == 1 and self.frames[0].module == 'codeop':
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del self.frames[:]
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# if the last frame is missing something went terrible wrong :(
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elif self.frames[-1] in new_frames:
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self.frames[:] = new_frames
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def is_syntax_error(self):
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"""Is it a syntax error?"""
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return isinstance(self.exc_value, SyntaxError)
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is_syntax_error = property(is_syntax_error)
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def exception(self):
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"""String representation of the exception."""
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buf = traceback.format_exception_only(self.exc_type, self.exc_value)
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rv = ''.join(buf).strip()
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return rv.decode('utf-8', 'replace') if PY2 else rv
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exception = property(exception)
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def log(self, logfile=None):
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"""Log the ASCII traceback into a file object."""
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if logfile is None:
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logfile = sys.stderr
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tb = self.plaintext.rstrip() + u'\n'
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if PY2:
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tb.encode('utf-8', 'replace')
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logfile.write(tb)
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def paste(self):
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"""Create a paste and return the paste id."""
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data = json.dumps({
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'description': 'Werkzeug Internal Server Error',
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'public': False,
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'files': {
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'traceback.txt': {
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'content': self.plaintext
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}
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}
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}).encode('utf-8')
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try:
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from urllib2 import urlopen
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except ImportError:
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from urllib.request import urlopen
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rv = urlopen('https://api.github.com/gists', data=data)
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resp = json.loads(rv.read().decode('utf-8'))
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rv.close()
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return {
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'url': resp['html_url'],
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'id': resp['id']
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}
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def render_summary(self, include_title=True):
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"""Render the traceback for the interactive console."""
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title = ''
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frames = []
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classes = ['traceback']
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if not self.frames:
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classes.append('noframe-traceback')
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if include_title:
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if self.is_syntax_error:
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title = u'Syntax Error'
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else:
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title = u'Traceback <em>(most recent call last)</em>:'
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for frame in self.frames:
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frames.append(u'<li%s>%s' % (
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frame.info and u' title="%s"' % escape(frame.info) or u'',
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frame.render()
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))
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if self.is_syntax_error:
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description_wrapper = u'<pre class=syntaxerror>%s</pre>'
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else:
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description_wrapper = u'<blockquote>%s</blockquote>'
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return SUMMARY_HTML % {
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'classes': u' '.join(classes),
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'title': title and u'<h3>%s</h3>' % title or u'',
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'frames': u'\n'.join(frames),
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'description': description_wrapper % escape(self.exception)
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}
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def render_full(self, evalex=False, secret=None):
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"""Render the Full HTML page with the traceback info."""
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exc = escape(self.exception)
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return PAGE_HTML % {
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'evalex': evalex and 'true' or 'false',
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'console': 'false',
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'title': exc,
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'exception': exc,
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'exception_type': escape(self.exception_type),
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'summary': self.render_summary(include_title=False),
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'plaintext': self.plaintext,
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'plaintext_cs': re.sub('-{2,}', '-', self.plaintext),
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'traceback_id': self.id,
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'secret': secret
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}
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def generate_plaintext_traceback(self):
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"""Like the plaintext attribute but returns a generator"""
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yield u'Traceback (most recent call last):'
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for frame in self.frames:
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yield u' File "%s", line %s, in %s' % (
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frame.filename,
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frame.lineno,
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frame.function_name
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)
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yield u' ' + frame.current_line.strip()
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yield self.exception
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def plaintext(self):
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return u'\n'.join(self.generate_plaintext_traceback())
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plaintext = cached_property(plaintext)
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id = property(lambda x: id(x))
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class Frame(object):
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"""A single frame in a traceback."""
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def __init__(self, exc_type, exc_value, tb):
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self.lineno = tb.tb_lineno
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self.function_name = tb.tb_frame.f_code.co_name
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self.locals = tb.tb_frame.f_locals
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self.globals = tb.tb_frame.f_globals
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fn = inspect.getsourcefile(tb) or inspect.getfile(tb)
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if fn[-4:] in ('.pyo', '.pyc'):
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fn = fn[:-1]
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# if it's a file on the file system resolve the real filename.
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if os.path.isfile(fn):
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fn = os.path.realpath(fn)
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self.filename = fn
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self.module = self.globals.get('__name__')
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self.loader = self.globals.get('__loader__')
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self.code = tb.tb_frame.f_code
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# support for paste's traceback extensions
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self.hide = self.locals.get('__traceback_hide__', False)
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info = self.locals.get('__traceback_info__')
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if info is not None:
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try:
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info = text_type(info)
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except UnicodeError:
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info = str(info).decode('utf-8', 'replace')
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self.info = info
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def render(self):
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"""Render a single frame in a traceback."""
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return FRAME_HTML % {
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'id': self.id,
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'filename': escape(self.filename),
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'lineno': self.lineno,
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'function_name': escape(self.function_name),
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'current_line': escape(self.current_line.strip())
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}
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def get_annotated_lines(self):
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"""Helper function that returns lines with extra information."""
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lines = [Line(idx + 1, x) for idx, x in enumerate(self.sourcelines)]
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# find function definition and mark lines
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if hasattr(self.code, 'co_firstlineno'):
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lineno = self.code.co_firstlineno - 1
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while lineno > 0:
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if _funcdef_re.match(lines[lineno].code):
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break
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lineno -= 1
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try:
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offset = len(inspect.getblock([x.code + '\n' for x
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in lines[lineno:]]))
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except TokenError:
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offset = 0
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for line in lines[lineno:lineno + offset]:
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line.in_frame = True
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# mark current line
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try:
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lines[self.lineno - 1].current = True
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except IndexError:
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pass
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return lines
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def render_source(self):
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"""Render the sourcecode."""
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return SOURCE_TABLE_HTML % u'\n'.join(line.render() for line in
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self.get_annotated_lines())
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def eval(self, code, mode='single'):
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"""Evaluate code in the context of the frame."""
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if isinstance(code, string_types):
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if PY2 and isinstance(code, unicode):
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code = UTF8_COOKIE + code.encode('utf-8')
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code = compile(code, '<interactive>', mode)
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return eval(code, self.globals, self.locals)
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@cached_property
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def sourcelines(self):
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"""The sourcecode of the file as list of unicode strings."""
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# get sourcecode from loader or file
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source = None
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if self.loader is not None:
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try:
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if hasattr(self.loader, 'get_source'):
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source = self.loader.get_source(self.module)
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elif hasattr(self.loader, 'get_source_by_code'):
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source = self.loader.get_source_by_code(self.code)
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except Exception:
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# we munch the exception so that we don't cause troubles
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# if the loader is broken.
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pass
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if source is None:
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try:
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f = open(self.filename)
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except IOError:
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return []
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try:
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source = f.read()
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finally:
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f.close()
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# already unicode? return right away
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if isinstance(source, text_type):
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return source.splitlines()
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# yes. it should be ascii, but we don't want to reject too many
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# characters in the debugger if something breaks
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charset = 'utf-8'
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if source.startswith(UTF8_COOKIE):
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source = source[3:]
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else:
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for idx, match in enumerate(_line_re.finditer(source)):
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match = _line_re.search(match.group())
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if match is not None:
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charset = match.group(1)
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break
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if idx > 1:
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break
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# on broken cookies we fall back to utf-8 too
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try:
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codecs.lookup(charset)
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except LookupError:
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charset = 'utf-8'
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return source.decode(charset, 'replace').splitlines()
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@property
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def current_line(self):
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try:
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return self.sourcelines[self.lineno - 1]
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except IndexError:
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return u''
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@cached_property
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def console(self):
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return Console(self.globals, self.locals)
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id = property(lambda x: id(x))
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