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__CONFIG_HELP__ = '''
<div class="traceback">
<b>To disable this interface, set </b>
<a target="window"
href="https://pecan.readthedocs.io/en/latest/deployment.html#disabling-debug-mode">
<pre>conf.app.debug = False</pre>
</a>
</div>
''' # noqa
try:
import re
from six import b
from backlash.debug import DebuggedApplication
class DebugMiddleware(DebuggedApplication):
body_re = re.compile(b('(<body[^>]*>)'), re.I)
def debug_application(self, environ, start_response):
for part in super(DebugMiddleware, self).debug_application(
environ, start_response
):
yield self.body_re.sub(b('\g<1>%s' % __CONFIG_HELP__), part)
except ImportError:
import logging
from traceback import print_exc
from pprint import pformat
from mako.template import Template
from six.moves import cStringIO as StringIO
from webob import Response
from webob.exc import HTTPException
LOG = logging.getLogger(__file__)
debug_template_raw = '''<html>
<head>
<title>Pecan - Application Error</title>
<body>
<header>
<h1>
An error occurred!
</h1>
</header>
<div id="error-content">
<p>
%(config_help)s
Pecan offers support for interactive debugging by installing the <a href="https://pypi.python.org/pypi/backlash" target="window">backlash</a> package:
<br />
<b><pre>pip install backlash</pre></b>
...and reloading this page.
</p>
<h2>Traceback</h2>
<div id="traceback">
<pre>${traceback}</pre>
</div>
<h2>WSGI Environment</h2>
<div id="environ">
<pre>${environment}</pre>
</div>
</div>
</body>
</html>
''' % {'config_help': __CONFIG_HELP__} # noqa
debug_template = Template(debug_template_raw)
class DebugMiddleware(object):
def __init__(self, app, *args, **kwargs):
self.app = app
def __call__(self, environ, start_response):
try:
return self.app(environ, start_response)
except Exception as exc:
# get a formatted exception
out = StringIO()
print_exc(file=out)
LOG.exception(exc)
# get formatted WSGI environment
formatted_environ = pformat(environ)
# render our template
result = debug_template.render(
traceback=out.getvalue(),
environment=formatted_environ
)
# construct and return our response
response = Response()
if isinstance(exc, HTTPException):
response.status_int = exc.status
else:
response.status_int = 500
response.unicode_body = result
return response(environ, start_response)