Show traceback on error

Closes: #21
This commit is contained in:
Edward Betts 2023-10-06 23:29:22 +01:00
parent 02b32dd5ef
commit e6e113e14a
4 changed files with 158 additions and 3 deletions

78
static/css/exception.css Normal file
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@ -0,0 +1,78 @@
div.debugger { text-align: left; padding: 12px; margin: auto;
background-color: white; }
div.detail { cursor: pointer; }
div.detail p { margin: 0 0 8px 13px; font-size: 14px; white-space: pre-wrap;
font-family: monospace; }
div.explanation { margin: 20px 13px; font-size: 15px; color: #555; }
div.footer { font-size: 13px; text-align: right; margin: 30px 0;
color: #86989B; }
h2 { font-size: 16px; margin: 1.3em 0 0.0 0; padding: 9px;
background-color: #11557C; color: white; }
h2 em, h3 em { font-style: normal; color: #A5D6D9; font-weight: normal; }
div.traceback, div.plain { border: 1px solid #ddd; margin: 0 0 1em 0; padding: 10px; }
div.plain p { margin: 0; }
div.plain textarea,
div.plain pre { margin: 10px 0 0 0; padding: 4px;
background-color: #E8EFF0; border: 1px solid #D3E7E9; }
div.plain textarea { width: 99%; height: 300px; }
div.traceback h3 { font-size: 1em; margin: 0 0 0.8em 0; }
div.traceback ul { list-style: none; margin: 0; padding: 0 0 0 1em; }
div.traceback h4 { font-size: 13px; font-weight: normal; margin: 0.7em 0 0.1em 0; }
div.traceback pre { margin: 0; padding: 5px 0 3px 15px;
background-color: #E8EFF0; border: 1px solid #D3E7E9; }
div.traceback .library .current { background: white; color: #555; }
div.traceback .expanded .current { background: #E8EFF0; color: black; }
div.traceback pre:hover { background-color: #DDECEE; color: black; cursor: pointer; }
div.traceback div.source.expanded pre + pre { border-top: none; }
div.traceback span.ws { display: none; }
div.traceback pre.before, div.traceback pre.after { display: none; background: white; }
div.traceback div.source.expanded pre.before,
div.traceback div.source.expanded pre.after {
display: block;
}
div.traceback div.source.expanded span.ws {
display: inline;
}
div.traceback blockquote { margin: 1em 0 0 0; padding: 0; white-space: pre-line; }
div.traceback img { float: right; padding: 2px; margin: -3px 2px 0 0; display: none; }
div.traceback img:hover { background-color: #ddd; cursor: pointer;
border-color: #BFDDE0; }
div.traceback pre:hover img { display: block; }
div.traceback cite.filename { font-style: normal; color: #3B666B; }
pre.console { border: 1px solid #ccc; background: white!important;
color: black; padding: 5px!important;
margin: 3px 0 0 0!important; cursor: default!important;
max-height: 400px; overflow: auto; }
pre.console form { color: #555; }
pre.console input { background-color: transparent; color: #555;
width: 90%; font-family: 'Consolas', 'Deja Vu Sans Mono',
'Bitstream Vera Sans Mono', monospace; font-size: 14px;
border: none!important; }
span.string { color: #30799B; }
span.number { color: #9C1A1C; }
span.help { color: #3A7734; }
span.object { color: #485F6E; }
span.extended { opacity: 0.5; }
span.extended:hover { opacity: 1; }
a.toggle { text-decoration: none; background-repeat: no-repeat;
background-position: center center;
background-image: url(?__debugger__=yes&cmd=resource&f=more.png); }
a.toggle:hover { background-color: #444; }
a.open { background-image: url(?__debugger__=yes&cmd=resource&f=less.png); }
div.traceback pre, div.console pre {
white-space: pre-wrap; /* css-3 should we be so lucky... */
white-space: -moz-pre-wrap; /* Mozilla, since 1999 */
white-space: -pre-wrap; /* Opera 4-6 ?? */
white-space: -o-pre-wrap; /* Opera 7 ?? */
word-wrap: break-word; /* Internet Explorer 5.5+ */
_white-space: pre; /* IE only hack to re-specify in
addition to word-wrap */
}

22
templates/base.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{% block title %}{% endblock %}</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">
{% block style %}
{% endblock %}
</head>
<body>
{% block content %}
{% endblock %}
{% block scripts %}
{% endblock %}
</body>
</html>

23
templates/show_error.html Normal file
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@ -0,0 +1,23 @@
{% extends "base.html" %}
{% block style %}
<link rel="stylesheet" href="{{url_for('static', filename='css/exception.css')}}" />
{% endblock %}
{% block content %}
<div class="p-2">
<h1>Software error: {{ exception_type }}</h1>
<div>
<pre>{{ exception }}</pre>
</div>
<h2 class="traceback">Traceback <em>(most recent call last)</em></h2>
{{ summary | safe }}
<p>Error in function "{{ last_frame.f_code.co_name }}": {{ last_frame_args | pprint }}</p>
<pre>{{ last_frame.f_locals | pprint }}</pre>
</div>
{% endblock %}

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@ -2,16 +2,48 @@
"""Web page to show upcoming events.""" """Web page to show upcoming events."""
import inspect
import sys
import traceback
from datetime import date, datetime, timezone from datetime import date, datetime, timezone
from flask import Flask, render_template import flask
import werkzeug
import werkzeug.debug.tbtools
from agenda import get_data from agenda import get_data
app = Flask(__name__) app = flask.Flask(__name__)
app.debug = True app.debug = True
@app.errorhandler(werkzeug.exceptions.InternalServerError)
def exception_handler(e: werkzeug.exceptions.InternalServerError) -> tuple[str, int]:
"""Handle exception."""
exec_type, exc_value, current_traceback = sys.exc_info()
assert exc_value
tb = werkzeug.debug.tbtools.DebugTraceback(exc_value)
summary = tb.render_traceback_html(include_title=False)
exc_lines = "".join(tb._te.format_exception_only())
last_frame = list(traceback.walk_tb(current_traceback))[-1][0]
last_frame_args = inspect.getargs(last_frame.f_code)
return (
flask.render_template(
"show_error.html",
plaintext=tb.render_traceback_text(),
exception=exc_lines,
exception_type=tb._te.exc_type.__name__,
summary=summary,
last_frame=last_frame,
last_frame_args=last_frame_args,
),
500,
)
@app.route("/") @app.route("/")
def index() -> str: def index() -> str:
"""Index page.""" """Index page."""
@ -27,7 +59,7 @@ def index() -> str:
def days(when: date) -> str: def days(when: date) -> str:
return "today" if when == today else f"{(when - today).days:,d} days" return "today" if when == today else f"{(when - today).days:,d} days"
return render_template("index.html", days=days, days_hours=days_hours, **data) return flask.render_template("index.html", days=days, days_hours=days_hours, **data)
if __name__ == "__main__": if __name__ == "__main__":