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630 lines
20 KiB
630 lines
20 KiB
5 years ago
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# -*- 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: 2007 Pallets
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:license: BSD-3-Clause
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"""
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import codecs
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import inspect
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import json
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import os
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import re
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import sys
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import sysconfig
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import traceback
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from tokenize import TokenError
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from .._compat import PY2
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from .._compat import range_type
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from .._compat import reraise
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from .._compat import string_types
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from .._compat import text_type
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from .._compat import to_native
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from .._compat import to_unicode
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from ..filesystem import get_filesystem_encoding
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from ..utils import cached_property
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from ..utils import escape
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from .console import Console
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_coding_re = re.compile(br"coding[:=]\s*([-\w.]+)")
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_line_re = re.compile(br"^(.*?)$", re.MULTILINE)
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_funcdef_re = re.compile(r"^(\s*def\s)|(.*(?<!\w)lambda(:|\s))|^(\s*@)")
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UTF8_COOKIE = b"\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"
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type="text/css">
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<!-- We need to make sure this has a favicon so that the debugger does
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not by accident trigger a request to /favicon.ico which might
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change the application state. -->
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<link rel="shortcut icon"
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href="?__debugger__=yes&cmd=resource&f=console.png">
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<script src="?__debugger__=yes&cmd=resource&f=jquery.js"></script>
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<script 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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EVALEX_TRUSTED = %(evalex_trusted)s,
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SECRET = "%(secret)s";
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</script>
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</head>
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<body style="background-color: #fff">
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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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<div class="pin-prompt">
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<div class="inner">
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<h3>Console Locked</h3>
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<p>
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The console is locked and needs to be unlocked by entering the PIN.
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You can find the PIN printed out on the standard output of your
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shell that runs the server.
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<form>
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<p>PIN:
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<input type=text name=pin size=14>
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<input type=submit name=btn value="Confirm Pin">
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</form>
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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 = (
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HEADER
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+ 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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"""
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+ FOOTER
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+ """
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<!--
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%(plaintext_cs)s
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-->
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"""
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)
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CONSOLE_HTML = (
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HEADER
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+ 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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"""
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+ FOOTER
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)
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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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<div class="source %(library)s">%(lines)s</div>
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</div>
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"""
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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, evalex_trusted=True):
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return CONSOLE_HTML % {
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"evalex": "true",
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"evalex_trusted": "true" if evalex_trusted else "false",
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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(
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ignore_system_exceptions=False, show_hidden_frames=False, skip=0
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):
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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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reraise(exc_type, exc_value, tb)
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for _ 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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@property
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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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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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self.tb = tb
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exception_type = exc_type.__name__
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if exc_type.__module__ not in {"builtins", "__builtin__", "exceptions"}:
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exception_type = exc_type.__module__ + "." + exception_type
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self.exception_type = exception_type
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self.groups = []
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memo = set()
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while True:
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self.groups.append(Group(exc_type, exc_value, tb))
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memo.add(id(exc_value))
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if PY2:
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break
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exc_value = exc_value.__cause__ or exc_value.__context__
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if exc_value is None or id(exc_value) in memo:
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break
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exc_type = type(exc_value)
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tb = exc_value.__traceback__
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self.groups.reverse()
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self.frames = [frame for group in self.groups for frame in group.frames]
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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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for group in self.groups:
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group.filter_hidden_frames()
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self.frames[:] = [frame for group in self.groups for frame in group.frames]
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@property
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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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@property
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def exception(self):
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"""String representation of the final exception."""
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return self.groups[-1].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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logfile.write(to_native(tb, "utf-8", "replace"))
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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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{
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"description": "Werkzeug Internal Server Error",
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"public": False,
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"files": {"traceback.txt": {"content": self.plaintext}},
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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 {"url": resp["html_url"], "id": resp["id"]}
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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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classes = ["traceback"]
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if not self.frames:
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classes.append("noframe-traceback")
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frames = []
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else:
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library_frames = sum(frame.is_library for frame in self.frames)
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mark_lib = 0 < library_frames < len(self.frames)
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frames = [group.render(mark_lib=mark_lib) for group in self.groups]
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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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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": u"<h3>%s</h3>" % title if title else 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, evalex_trusted=True):
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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": "true" if evalex else "false",
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"evalex_trusted": "true" if evalex_trusted else "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": escape(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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@cached_property
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def plaintext(self):
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return u"\n".join([group.render_text() for group in self.groups])
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@property
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def id(self):
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return id(self)
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class Group(object):
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"""A group of frames for an exception in a traceback. On Python 3,
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if the exception has a ``__cause__`` or ``__context__``, there are
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multiple exception groups.
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"""
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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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self.info = None
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if not PY2:
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if exc_value.__cause__ is not None:
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self.info = (
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u"The above exception was the direct cause of the"
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u" following exception"
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)
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elif exc_value.__context__ is not None:
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self.info = (
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|
|
u"During handling of the above exception, another"
|
||
|
|
u" exception occurred"
|
||
|
|
)
|
||
|
|
|
||
|
|
self.frames = []
|
||
|
|
while tb is not None:
|
||
|
|
self.frames.append(Frame(exc_type, exc_value, tb))
|
||
|
|
tb = tb.tb_next
|
||
|
|
|
||
|
|
def filter_hidden_frames(self):
|
||
|
|
new_frames = []
|
||
|
|
hidden = False
|
||
|
|
|
||
|
|
for frame in self.frames:
|
||
|
|
hide = frame.hide
|
||
|
|
if hide in ("before", "before_and_this"):
|
||
|
|
new_frames = []
|
||
|
|
hidden = False
|
||
|
|
if hide == "before_and_this":
|
||
|
|
continue
|
||
|
|
elif hide in ("reset", "reset_and_this"):
|
||
|
|
hidden = False
|
||
|
|
if hide == "reset_and_this":
|
||
|
|
continue
|
||
|
|
elif hide in ("after", "after_and_this"):
|
||
|
|
hidden = True
|
||
|
|
if hide == "after_and_this":
|
||
|
|
continue
|
||
|
|
elif hide or hidden:
|
||
|
|
continue
|
||
|
|
new_frames.append(frame)
|
||
|
|
|
||
|
|
# if we only have one frame and that frame is from the codeop
|
||
|
|
# module, remove it.
|
||
|
|
if len(new_frames) == 1 and self.frames[0].module == "codeop":
|
||
|
|
del self.frames[:]
|
||
|
|
|
||
|
|
# if the last frame is missing something went terrible wrong :(
|
||
|
|
elif self.frames[-1] in new_frames:
|
||
|
|
self.frames[:] = new_frames
|
||
|
|
|
||
|
|
@property
|
||
|
|
def exception(self):
|
||
|
|
"""String representation of the exception."""
|
||
|
|
buf = traceback.format_exception_only(self.exc_type, self.exc_value)
|
||
|
|
rv = "".join(buf).strip()
|
||
|
|
return to_unicode(rv, "utf-8", "replace")
|
||
|
|
|
||
|
|
def render(self, mark_lib=True):
|
||
|
|
out = []
|
||
|
|
if self.info is not None:
|
||
|
|
out.append(u'<li><div class="exc-divider">%s:</div>' % self.info)
|
||
|
|
for frame in self.frames:
|
||
|
|
out.append(
|
||
|
|
u"<li%s>%s"
|
||
|
|
% (
|
||
|
|
u' title="%s"' % escape(frame.info) if frame.info else u"",
|
||
|
|
frame.render(mark_lib=mark_lib),
|
||
|
|
)
|
||
|
|
)
|
||
|
|
return u"\n".join(out)
|
||
|
|
|
||
|
|
def render_text(self):
|
||
|
|
out = []
|
||
|
|
if self.info is not None:
|
||
|
|
out.append(u"\n%s:\n" % self.info)
|
||
|
|
out.append(u"Traceback (most recent call last):")
|
||
|
|
for frame in self.frames:
|
||
|
|
out.append(frame.render_text())
|
||
|
|
out.append(self.exception)
|
||
|
|
return u"\n".join(out)
|
||
|
|
|
||
|
|
|
||
|
|
class Frame(object):
|
||
|
|
"""A single frame in a traceback."""
|
||
|
|
|
||
|
|
def __init__(self, exc_type, exc_value, tb):
|
||
|
|
self.lineno = tb.tb_lineno
|
||
|
|
self.function_name = tb.tb_frame.f_code.co_name
|
||
|
|
self.locals = tb.tb_frame.f_locals
|
||
|
|
self.globals = tb.tb_frame.f_globals
|
||
|
|
|
||
|
|
fn = inspect.getsourcefile(tb) or inspect.getfile(tb)
|
||
|
|
if fn[-4:] in (".pyo", ".pyc"):
|
||
|
|
fn = fn[:-1]
|
||
|
|
# if it's a file on the file system resolve the real filename.
|
||
|
|
if os.path.isfile(fn):
|
||
|
|
fn = os.path.realpath(fn)
|
||
|
|
self.filename = to_unicode(fn, get_filesystem_encoding())
|
||
|
|
self.module = self.globals.get("__name__")
|
||
|
|
self.loader = self.globals.get("__loader__")
|
||
|
|
self.code = tb.tb_frame.f_code
|
||
|
|
|
||
|
|
# support for paste's traceback extensions
|
||
|
|
self.hide = self.locals.get("__traceback_hide__", False)
|
||
|
|
info = self.locals.get("__traceback_info__")
|
||
|
|
if info is not None:
|
||
|
|
info = to_unicode(info, "utf-8", "replace")
|
||
|
|
self.info = info
|
||
|
|
|
||
|
|
def render(self, mark_lib=True):
|
||
|
|
"""Render a single frame in a traceback."""
|
||
|
|
return FRAME_HTML % {
|
||
|
|
"id": self.id,
|
||
|
|
"filename": escape(self.filename),
|
||
|
|
"lineno": self.lineno,
|
||
|
|
"function_name": escape(self.function_name),
|
||
|
|
"lines": self.render_line_context(),
|
||
|
|
"library": "library" if mark_lib and self.is_library else "",
|
||
|
|
}
|
||
|
|
|
||
|
|
@cached_property
|
||
|
|
def is_library(self):
|
||
|
|
return any(
|
||
|
|
self.filename.startswith(path) for path in sysconfig.get_paths().values()
|
||
|
|
)
|
||
|
|
|
||
|
|
def render_text(self):
|
||
|
|
return u' File "%s", line %s, in %s\n %s' % (
|
||
|
|
self.filename,
|
||
|
|
self.lineno,
|
||
|
|
self.function_name,
|
||
|
|
self.current_line.strip(),
|
||
|
|
)
|
||
|
|
|
||
|
|
def render_line_context(self):
|
||
|
|
before, current, after = self.get_context_lines()
|
||
|
|
rv = []
|
||
|
|
|
||
|
|
def render_line(line, cls):
|
||
|
|
line = line.expandtabs().rstrip()
|
||
|
|
stripped_line = line.strip()
|
||
|
|
prefix = len(line) - len(stripped_line)
|
||
|
|
rv.append(
|
||
|
|
'<pre class="line %s"><span class="ws">%s</span>%s</pre>'
|
||
|
|
% (cls, " " * prefix, escape(stripped_line) or " ")
|
||
|
|
)
|
||
|
|
|
||
|
|
for line in before:
|
||
|
|
render_line(line, "before")
|
||
|
|
render_line(current, "current")
|
||
|
|
for line in after:
|
||
|
|
render_line(line, "after")
|
||
|
|
|
||
|
|
return "\n".join(rv)
|
||
|
|
|
||
|
|
def get_annotated_lines(self):
|
||
|
|
"""Helper function that returns lines with extra information."""
|
||
|
|
lines = [Line(idx + 1, x) for idx, x in enumerate(self.sourcelines)]
|
||
|
|
|
||
|
|
# find function definition and mark lines
|
||
|
|
if hasattr(self.code, "co_firstlineno"):
|
||
|
|
lineno = self.code.co_firstlineno - 1
|
||
|
|
while lineno > 0:
|
||
|
|
if _funcdef_re.match(lines[lineno].code):
|
||
|
|
break
|
||
|
|
lineno -= 1
|
||
|
|
try:
|
||
|
|
offset = len(inspect.getblock([x.code + "\n" for x in lines[lineno:]]))
|
||
|
|
except TokenError:
|
||
|
|
offset = 0
|
||
|
|
for line in lines[lineno : lineno + offset]:
|
||
|
|
line.in_frame = True
|
||
|
|
|
||
|
|
# mark current line
|
||
|
|
try:
|
||
|
|
lines[self.lineno - 1].current = True
|
||
|
|
except IndexError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
return lines
|
||
|
|
|
||
|
|
def eval(self, code, mode="single"):
|
||
|
|
"""Evaluate code in the context of the frame."""
|
||
|
|
if isinstance(code, string_types):
|
||
|
|
if PY2 and isinstance(code, text_type): # noqa
|
||
|
|
code = UTF8_COOKIE + code.encode("utf-8")
|
||
|
|
code = compile(code, "<interactive>", mode)
|
||
|
|
return eval(code, self.globals, self.locals)
|
||
|
|
|
||
|
|
@cached_property
|
||
|
|
def sourcelines(self):
|
||
|
|
"""The sourcecode of the file as list of unicode strings."""
|
||
|
|
# get sourcecode from loader or file
|
||
|
|
source = None
|
||
|
|
if self.loader is not None:
|
||
|
|
try:
|
||
|
|
if hasattr(self.loader, "get_source"):
|
||
|
|
source = self.loader.get_source(self.module)
|
||
|
|
elif hasattr(self.loader, "get_source_by_code"):
|
||
|
|
source = self.loader.get_source_by_code(self.code)
|
||
|
|
except Exception:
|
||
|
|
# we munch the exception so that we don't cause troubles
|
||
|
|
# if the loader is broken.
|
||
|
|
pass
|
||
|
|
|
||
|
|
if source is None:
|
||
|
|
try:
|
||
|
|
f = open(to_native(self.filename, get_filesystem_encoding()), mode="rb")
|
||
|
|
except IOError:
|
||
|
|
return []
|
||
|
|
try:
|
||
|
|
source = f.read()
|
||
|
|
finally:
|
||
|
|
f.close()
|
||
|
|
|
||
|
|
# already unicode? return right away
|
||
|
|
if isinstance(source, text_type):
|
||
|
|
return source.splitlines()
|
||
|
|
|
||
|
|
# yes. it should be ascii, but we don't want to reject too many
|
||
|
|
# characters in the debugger if something breaks
|
||
|
|
charset = "utf-8"
|
||
|
|
if source.startswith(UTF8_COOKIE):
|
||
|
|
source = source[3:]
|
||
|
|
else:
|
||
|
|
for idx, match in enumerate(_line_re.finditer(source)):
|
||
|
|
match = _coding_re.search(match.group())
|
||
|
|
if match is not None:
|
||
|
|
charset = match.group(1)
|
||
|
|
break
|
||
|
|
if idx > 1:
|
||
|
|
break
|
||
|
|
|
||
|
|
# on broken cookies we fall back to utf-8 too
|
||
|
|
charset = to_native(charset)
|
||
|
|
try:
|
||
|
|
codecs.lookup(charset)
|
||
|
|
except LookupError:
|
||
|
|
charset = "utf-8"
|
||
|
|
|
||
|
|
return source.decode(charset, "replace").splitlines()
|
||
|
|
|
||
|
|
def get_context_lines(self, context=5):
|
||
|
|
before = self.sourcelines[self.lineno - context - 1 : self.lineno - 1]
|
||
|
|
past = self.sourcelines[self.lineno : self.lineno + context]
|
||
|
|
return (before, self.current_line, past)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def current_line(self):
|
||
|
|
try:
|
||
|
|
return self.sourcelines[self.lineno - 1]
|
||
|
|
except IndexError:
|
||
|
|
return u""
|
||
|
|
|
||
|
|
@cached_property
|
||
|
|
def console(self):
|
||
|
|
return Console(self.globals, self.locals)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def id(self):
|
||
|
|
return id(self)
|