Merge pull request #291 from subyraman/master
Add rich HTML traceback in debug mode, add HTML 500 page in prod
This commit is contained in:
Eli Uriegas
GitHub
commit
9108a4c69f
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@ -12,3 +12,4 @@ kyoukai
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falcon
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tornado
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aiofiles
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beautifulsoup4
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@ -1,6 +1,104 @@
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from .response import text
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from .response import text, html
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from .log import log
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from traceback import format_exc
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from traceback import format_exc, extract_tb
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import sys
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TRACEBACK_STYLE = '''
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<style>
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body {
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padding: 20px;
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font-family: Arial, sans-serif;
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}
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p {
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margin: 0;
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}
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.summary {
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padding: 10px;
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}
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h1 {
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margin-bottom: 0;
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}
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h3 {
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margin-top: 10px;
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}
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h3 code {
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font-size: 24px;
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}
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.frame-line > * {
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padding: 5px 10px;
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}
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.frame-line {
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margin-bottom: 5px;
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}
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.frame-code {
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font-size: 16px;
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padding-left: 30px;
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}
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.tb-wrapper {
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border: 1px solid #f3f3f3;
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}
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.tb-header {
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background-color: #f3f3f3;
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padding: 5px 10px;
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}
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.frame-descriptor {
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background-color: #e2eafb;
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}
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.frame-descriptor {
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font-size: 14px;
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}
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</style>
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'''
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TRACEBACK_WRAPPER_HTML = '''
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<html>
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<head>
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{style}
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</head>
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<body>
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<h1>{exc_name}</h1>
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<h3><code>{exc_value}</code></h3>
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<div class="tb-wrapper">
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<p class="tb-header">Traceback (most recent call last):</p>
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{frame_html}
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<p class="summary">
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<b>{exc_name}: {exc_value}</b>
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while handling uri <code>{uri}</code>
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</p>
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</div>
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</body>
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</html>
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'''
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TRACEBACK_LINE_HTML = '''
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<div class="frame-line">
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<p class="frame-descriptor">
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File {0.filename}, line <i>{0.lineno}</i>,
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in <code><b>{0.name}</b></code>
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</p>
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<p class="frame-code"><code>{0.line}</code></p>
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</div>
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'''
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INTERNAL_SERVER_ERROR_HTML = '''
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<h1>Internal Server Error</h1>
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<p>
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The server encountered an internal error and cannot complete
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your request.
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</p>
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'''
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class SanicException(Exception):
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@ -46,6 +144,21 @@ class Handler:
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self.handlers = {}
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self.sanic = sanic
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def _render_traceback_html(self, exception, request):
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exc_type, exc_value, tb = sys.exc_info()
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frames = extract_tb(tb)
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frame_html = []
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for frame in frames:
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frame_html.append(TRACEBACK_LINE_HTML.format(frame))
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return TRACEBACK_WRAPPER_HTML.format(
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style=TRACEBACK_STYLE,
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exc_name=exc_type.__name__,
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exc_value=exc_value,
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frame_html=''.join(frame_html),
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uri=request.url)
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def add(self, exception, handler):
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self.handlers[exception] = handler
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@ -77,11 +190,12 @@ class Handler:
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'Error: {}'.format(exception),
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status=getattr(exception, 'status_code', 500))
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elif self.sanic.debug:
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html_output = self._render_traceback_html(exception, request)
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response_message = (
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'Exception occurred while handling uri: "{}"\n{}'.format(
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request.url, format_exc()))
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log.error(response_message)
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return text(response_message, status=500)
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return html(html_output, status=500)
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else:
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return text(
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'An error occurred while generating the response', status=500)
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return html(INTERNAL_SERVER_ERROR_HTML, status=500)
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@ -1,4 +1,5 @@
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import pytest
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from bs4 import BeautifulSoup
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from sanic import Sanic
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from sanic.response import text
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@ -75,7 +76,13 @@ def test_handled_unhandled_exception(exception_app):
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request, response = sanic_endpoint_test(
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exception_app, uri='/divide_by_zero')
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assert response.status == 500
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assert response.body == b'An error occurred while generating the response'
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soup = BeautifulSoup(response.body, 'html.parser')
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assert soup.h1.text == 'Internal Server Error'
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message = " ".join(soup.p.text.split())
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assert message == (
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"The server encountered an internal error and "
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"cannot complete your request.")
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def test_exception_in_exception_handler(exception_app):
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@ -2,6 +2,7 @@ from sanic import Sanic
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from sanic.response import text
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from sanic.exceptions import InvalidUsage, ServerError, NotFound
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from sanic.utils import sanic_endpoint_test
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from bs4 import BeautifulSoup
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exception_handler_app = Sanic('test_exception_handler')
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@ -21,6 +22,12 @@ def handler_3(request):
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raise NotFound("OK")
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@exception_handler_app.route('/4')
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def handler_4(request):
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foo = bar
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return text(foo)
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@exception_handler_app.exception(NotFound, ServerError)
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def handler_exception(request, exception):
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return text("OK")
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@ -47,3 +54,20 @@ def test_text_exception__handler():
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exception_handler_app, uri='/random')
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assert response.status == 200
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assert response.text == 'OK'
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def test_html_traceback_output_in_debug_mode():
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request, response = sanic_endpoint_test(
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exception_handler_app, uri='/4', debug=True)
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assert response.status == 500
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soup = BeautifulSoup(response.body, 'html.parser')
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html = str(soup)
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assert 'response = handler(request, *args, **kwargs)' in html
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assert 'handler_4' in html
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assert 'foo = bar' in html
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summary_text = " ".join(soup.select('.summary')[0].text.split())
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assert (
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"NameError: name 'bar' "
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"is not defined while handling uri /4") == summary_text
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