openstack/deb-python-pecan
Code Issues Proposed changes

Adding the ability to re-process a failed request with a pdb breakpoint

Browse Source 
in the debug middleware.
This commit is contained in:
Jonathan LaCour
2012-03-20 09:47:57 -07:00
parent 9c581f86fa
commit 9a91cb5695
1 changed files with 75 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

76
pecan/middleware/debug.py
View File

@@ -6,6 +6,8 @@ from mako.template import Template
from webob import Response
import pdb
debug_template_raw = '''<html>
<head>
<title>Pecan - Application Error</title>
@@ -119,6 +121,12 @@ debug_template_raw = '''<html>
color: #C70 !important;
}
#debug {
background: #FDF6E3;
padding: 10px !important;
margin-top: 10px;
font-family: monospace;
}
</style>
<script type="text/javascript">
@@ -126,6 +134,38 @@ debug_template_raw = '''<html>
SyntaxHighlighter.defaults['toolbar'] = false;
SyntaxHighlighter.all()
</script>
<script type="text/javascript">
function get_request() {
/* ajax sans jquery makes me sad */
var request = false;
// Mozilla/Safari
if (window.XMLHttpRequest) {
request = new XMLHttpRequest();
}
// IE
else if (window.ActiveXObject) {
request = new ActiveXObject("Microsoft.XMLHTTP");
}
return request;
}
function debug_request(btn) {
btn.disabled = true;
request = get_request();
request.open('GET', '/__pecan_initiate_pdb__', true);
request.onreadystatechange = function() {
if (request.readyState == 4) {
btn.disabled = false;
}
}
request.send('/__pecan_initiate_pdb__');
}
</script>
</head>
<body>
@@ -151,6 +191,15 @@ debug_template_raw = '''<html>
<pre class="brush: python">${traceback}</pre>
</div>
% if not debugging:
<b>Want to debug this request?</b>
<div id="debug">
You can <button onclick="debug_request(this)">
repeat this request
</button> with a Python debugger breakpoint.
</div>
% endif
<h2>WSGI Environment</h2>
<div id="environ">
<pre class="brush: python">${environment}</pre>
@@ -161,6 +210,18 @@ debug_template_raw = '''<html>
'''
debug_template = Template(debug_template_raw)
__debug_environ__ = None
class PdbMiddleware(object):
def __init__(self, app):
self.app = app
def __call__(self, environ, start_response):
try:
return self.app(environ, start_response)
except:
pdb.post_mortem()
class DebugMiddleware(object):
@@ -171,9 +232,21 @@ class DebugMiddleware(object):
assert not environ['wsgi.multiprocess'], (
"The DebugMiddleware middleware is not usable in a "
"multi-process environment")
# initiate a PDB session if requested
global __debug_environ__
debugging = environ['PATH_INFO'] == '/__pecan_initiate_pdb__'
if debugging:
PdbMiddleware(self.app)(__debug_environ__, start_response)
environ = __debug_environ__
try:
return self.app(environ, start_response)
except:
# save the environ for debugging
if not debugging:
__debug_environ__ = environ
# get a formatted exception
out = StringIO()
print_exc(file=out)
@@ -189,7 +262,8 @@ class DebugMiddleware(object):
shcore=shcore,
shbrushpython=shbrushpython,
shcorecss=shcorecss,
shthemedefault=shthemedefault
shthemedefault=shthemedefault,
debugging=debugging
)
# construct and return our response