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Code Issues 25 Releases Wiki Activity

Fixed #33701 -- Added fine-grained error locations to the technical 500 debug page.

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This commit is contained in:
Giebisch 2022-11-03 11:49:10 +01:00 committed by Mariusz Felisiak
parent 9d726c7902
commit 85b52d22fd
6 changed files with 101 additions and 5 deletions
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1
AUTHORS
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@ -802,6 +802,7 @@ answer newbie questions, and generally made Django that much better:
Rachel Tobin <rmtobin@me.com>
Rachel Willmer <http://www.willmer.com/kb/>
Radek Švarz <https://www.svarz.cz/translate/>
Rafael Giebisch <rafael@giebisch-mail.de>
Raffaele Salmaso <raffaele@salmaso.org>
Rajesh Dhawan <rajesh.dhawan@gmail.com>
Ramez Ashraf <ramezashraf@gmail.com>

23
django/views/debug.py
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@ -1,4 +1,5 @@
import functools
import itertools
import re
import sys
import types
@ -15,7 +16,7 @@ from django.utils.datastructures import MultiValueDict
from django.utils.encoding import force_str
from django.utils.module_loading import import_string
from django.utils.regex_helper import _lazy_re_compile
from django.utils.version import get_docs_version
from django.utils.version import PY311, get_docs_version
# Minimal Django templates engine to render the error templates
# regardless of the project's TEMPLATES setting. Templates are
@ -546,6 +547,24 @@ class ExceptionReporter:
pre_context = []
context_line = "<source code not available>"
post_context = []
colno = tb_area_colno = ""
if PY311:
_, _, start_column, end_column = next(
itertools.islice(
tb.tb_frame.f_code.co_positions(), tb.tb_lasti // 2, None
)
)
if start_column and end_column:
underline = "^" * (end_column - start_column)
spaces = " " * (start_column + len(str(lineno + 1)) + 2)
colno = f"\n{spaces}{underline}"
tb_area_spaces = " " * (
4
+ start_column
- (len(context_line) - len(context_line.lstrip()))
)
tb_area_colno = f"\n{tb_area_spaces}{underline}"
yield {
"exc_cause": exc_cause,
"exc_cause_explicit": exc_cause_explicit,
@ -562,6 +581,8 @@ class ExceptionReporter:
"context_line": context_line,
"post_context": post_context,
"pre_context_lineno": pre_context_lineno + 1,
"colno": colno,
"tb_area_colno": tb_area_colno,
}
tb = tb.tb_next

4
django/views/templates/technical_500.html
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@ -242,7 +242,7 @@
</ol>
{% endif %}
<ol start="{{ frame.lineno }}" class="context-line">
<li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')"><pre>{{ frame.context_line }}</pre>{% if not is_email %} <span>…</span>{% endif %}</li>
<li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')"><pre>{{ frame.context_line }}{{ frame.colno }}</pre>{% if not is_email %} <span>…</span>{% endif %}</li>
</ol>
{% if frame.post_context and not is_email %}
<ol start='{{ frame.lineno|add:"1" }}' class="post-context" id="post{{ frame.id }}">
@ -327,7 +327,7 @@ The above exception ({{ frame.exc_cause|force_escape }}) was the direct cause of
{% else %}
During handling of the above exception ({{ frame.exc_cause|force_escape }}), another exception occurred:
{% endif %}{% endif %}{% endifchanged %} {% if frame.tb %}File "{{ frame.filename }}"{% if frame.context_line %}, line {{ frame.lineno }}{% endif %}, in {{ frame.function }}
{% if frame.context_line %} {% spaceless %}{{ frame.context_line }}{% endspaceless %}{% endif %}{% elif forloop.first %}None{% else %}Traceback: None{% endif %}{% endfor %}
{% if frame.context_line %} {% spaceless %}{{ frame.context_line }}{% endspaceless %}{{ frame.tb_area_colno }}{% endif %}{% elif forloop.first %}None{% else %}Traceback: None{% endif %}{% endfor %}
Exception Type: {{ exception_type }}{% if request %} at {{ request.path_info }}{% endif %}
Exception Value: {{ exception_value|force_escape }}{% if exception_notes %}{{ exception_notes }}{% endif %}

2
django/views/templates/technical_500.txt
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@ -31,7 +31,7 @@ Traceback (most recent call last):
{% for frame in frames %}{% ifchanged frame.exc_cause %}{% if frame.exc_cause %}
{% if frame.exc_cause_explicit %}The above exception ({{ frame.exc_cause }}) was the direct cause of the following exception:{% else %}During handling of the above exception ({{ frame.exc_cause }}), another exception occurred:{% endif %}
{% endif %}{% endifchanged %} {% if frame.tb %}File "{{ frame.filename }}"{% if frame.context_line %}, line {{ frame.lineno }}{% endif %}, in {{ frame.function }}
{% if frame.context_line %} {% spaceless %}{{ frame.context_line }}{% endspaceless %}{% endif %}{% elif forloop.first %}None{% else %}Traceback: None{% endif %}
{% if frame.context_line %} {% spaceless %}{{ frame.context_line }}{% endspaceless %}{{ frame.tb_area_colno }}{% endif %}{% elif forloop.first %}None{% else %}Traceback: None{% endif %}
{% endfor %}
{% if exception_type %}Exception Type: {{ exception_type }}{% if request %} at {{ request.path_info }}{% endif %}
{% if exception_value %}Exception Value: {{ exception_value }}{% endif %}{% if exception_notes %}{{ exception_notes }}{% endif %}{% endif %}{% endif %}

3
docs/releases/4.2.txt
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@ -161,7 +161,8 @@ Email
Error Reporting
~~~~~~~~~~~~~~~
* The debug page now shows :pep:`exception notes <678>` on Python 3.11+.
* The debug page now shows :pep:`exception notes <678>` and
:pep:`fine-grained error locations <657>` on Python 3.11+.
File Storage
~~~~~~~~~~~~

73
tests/view_tests/tests/test_debug.py
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@ -766,6 +766,79 @@ class ExceptionReporterTests(SimpleTestCase):
self.assertIn(implicit_exc.format("<p>Second exception</p>"), text)
self.assertEqual(3, text.count("<p>Final exception</p>"))
@skipIf(
sys._xoptions.get("no_debug_ranges", False)
or os.environ.get("PYTHONNODEBUGRANGES", False),
"Fine-grained error locations are disabled.",
)
@skipUnless(PY311, "Fine-grained error locations were added in Python 3.11.")
def test_highlight_error_position(self):
request = self.rf.get("/test_view/")
try:
try:
raise AttributeError("Top level")
except AttributeError as explicit:
try:
raise ValueError(mark_safe("<p>2nd exception</p>")) from explicit
except ValueError:
raise IndexError("Final exception")
except Exception:
exc_type, exc_value, tb = sys.exc_info()
reporter = ExceptionReporter(request, exc_type, exc_value, tb)
html = reporter.get_traceback_html()
self.assertIn(
"<pre> raise AttributeError(&quot;Top level&quot;)\n"
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^</pre>",
html,
)
self.assertIn(
"<pre> raise ValueError(mark_safe("
"&quot;&lt;p&gt;2nd exception&lt;/p&gt;&quot;)) from explicit\n"
" "
"^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^</pre>",
html,
)
self.assertIn(
"<pre> raise IndexError(&quot;Final exception&quot;)\n"
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^</pre>",
html,
)
# Pastebin.
self.assertIn(
" raise AttributeError(&quot;Top level&quot;)\n"
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
html,
)
self.assertIn(
" raise ValueError(mark_safe("
"&quot;&lt;p&gt;2nd exception&lt;/p&gt;&quot;)) from explicit\n"
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
html,
)
self.assertIn(
" raise IndexError(&quot;Final exception&quot;)\n"
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
html,
)
# Text traceback.
text = reporter.get_traceback_text()
self.assertIn(
' raise AttributeError("Top level")\n'
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
text,
)
self.assertIn(
' raise ValueError(mark_safe("<p>2nd exception</p>")) from explicit\n'
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
text,
)
self.assertIn(
' raise IndexError("Final exception")\n'
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
text,
)
def test_reporting_frames_without_source(self):
try:
source = "def funcName():\n raise Error('Whoops')\nfuncName()"