Initial check-in of cgitb.
A few enhancements are pending, but this should work reliably.
This commit is contained in:
Ka-Ping Yee
parent
e5e50591a4
commit
6b5a48d48e
|
|
@ -0,0 +1,182 @@
|
|||
"""Handle exceptions in CGI scripts by formatting tracebacks into nice HTML.
|
||||
|
||||
To enable this module, do:
|
||||
|
||||
import cgitb; cgitb.enable()
|
||||
|
||||
at the top of your CGI script. The optional arguments to enable() are:
|
||||
|
||||
display - if true, tracebacks are displayed in the web browser
|
||||
logdir - if set, tracebacks are written to files in this directory
|
||||
|
||||
By default, tracebacks are displayed but not written to files.
|
||||
|
||||
Alternatively, if you have caught an exception and want cgitb to display it
|
||||
for you, call cgitb.handle(). The optional argument to handle() is a 3-item
|
||||
tuple (etype, evalue, etb) just like the value of sys.exc_info()."""
|
||||
|
||||
__author__ = 'Ka-Ping Yee'
|
||||
__version__ = '$Revision$'
|
||||
|
||||
def reset():
|
||||
"""Return a string that resets the CGI and browser to a known state."""
|
||||
return '''<!--: spam
|
||||
Content-Type: text/html
|
||||
|
||||
<body bgcolor="#f0f0ff"><font color="#f0f0ff" size="-5"> -->
|
||||
<body bgcolor="#f0f0ff"><font color="#f0f0ff" size="-5"> --> -->
|
||||
</font> </font> </font> </script> </object> </blockquote> </pre>
|
||||
</table> </table> </table> </table> </table> </font> </font> </font>'''
|
||||
|
||||
def html(etype, evalue, etb, context=5):
|
||||
"""Return a nice HTML document describing the traceback."""
|
||||
import sys, os, types, time, traceback
|
||||
import keyword, tokenize, linecache, inspect, pydoc
|
||||
|
||||
if type(etype) is types.ClassType:
|
||||
etype = etype.__name__
|
||||
pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
|
||||
date = time.ctime(time.time())
|
||||
head = '<body bgcolor="#f0f0ff">' + pydoc.html.heading(
|
||||
'<big><big><strong>%s</strong></big></big>' % str(etype),
|
||||
'#ffffff', '#aa55cc', pyver + '<br>' + date) + '''
|
||||
<p>A problem occurred in a Python script.
|
||||
Here is the sequence of function calls leading up to
|
||||
the error, with the most recent (innermost) call last.'''
|
||||
|
||||
indent = '<tt><small>' + ' ' * 5 + '</small> </tt>'
|
||||
frames = []
|
||||
records = inspect.getinnerframes(etb, context)
|
||||
for frame, file, lnum, func, lines, index in records:
|
||||
file = file and os.path.abspath(file) or '?'
|
||||
link = '<a href="file:%s">%s</a>' % (file, pydoc.html.escape(file))
|
||||
args, varargs, varkw, locals = inspect.getargvalues(frame)
|
||||
if func == '?':
|
||||
call = ''
|
||||
else:
|
||||
def eqrepr(value): return '=' + pydoc.html.repr(value)
|
||||
call = 'in <strong>%s</strong>' % func + inspect.formatargvalues(
|
||||
args, varargs, varkw, locals, formatvalue=eqrepr)
|
||||
|
||||
names = []
|
||||
def tokeneater(type, token, start, end, line):
|
||||
if type == tokenize.NAME and token not in keyword.kwlist:
|
||||
if token not in names: names.append(token)
|
||||
if type == tokenize.NEWLINE: raise IndexError
|
||||
def linereader(lnum=[lnum]):
|
||||
line = linecache.getline(file, lnum[0])
|
||||
lnum[0] += 1
|
||||
return line
|
||||
|
||||
try:
|
||||
tokenize.tokenize(linereader, tokeneater)
|
||||
except IndexError: pass
|
||||
lvals = []
|
||||
for name in names:
|
||||
if name in frame.f_code.co_varnames:
|
||||
if locals.has_key(name):
|
||||
value = pydoc.html.repr(locals[name])
|
||||
else:
|
||||
value = '<em>undefined</em>'
|
||||
name = '<strong>%s</strong>' % name
|
||||
else:
|
||||
if frame.f_globals.has_key(name):
|
||||
value = pydoc.html.repr(frame.f_globals[name])
|
||||
else:
|
||||
value = '<em>undefined</em>'
|
||||
name = '<em>global</em> <strong>%s</strong>' % name
|
||||
lvals.append('%s = %s' % (name, value))
|
||||
if lvals:
|
||||
lvals = indent + '''
|
||||
<small><font color="#909090">%s</font></small><br>''' % (', '.join(lvals))
|
||||
else:
|
||||
lvals = ''
|
||||
|
||||
level = '''
|
||||
<table width="100%%" bgcolor="#d8bbff" cellspacing=0 cellpadding=2 border=0>
|
||||
<tr><td>%s %s</td></tr></table>\n''' % (link, call)
|
||||
excerpt = []
|
||||
if index is not None:
|
||||
i = lnum - index
|
||||
for line in lines:
|
||||
num = '<small><font color="#909090">%s</font></small>' % (
|
||||
' ' * (5-len(str(i))) + str(i))
|
||||
line = '<tt>%s %s</tt>' % (num, pydoc.html.preformat(line))
|
||||
if i == lnum:
|
||||
line = '''
|
||||
<table width="100%%" bgcolor="#ffccee" cellspacing=0 cellpadding=0 border=0>
|
||||
<tr><td>%s</td></tr></table>\n''' % line
|
||||
excerpt.append('\n' + line)
|
||||
if i == lnum:
|
||||
excerpt.append(lvals)
|
||||
i = i + 1
|
||||
frames.append('<p>' + level + '\n'.join(excerpt))
|
||||
|
||||
exception = ['<p><strong>%s</strong>: %s' % (str(etype), str(evalue))]
|
||||
if type(evalue) is types.InstanceType:
|
||||
for name in dir(evalue):
|
||||
value = pydoc.html.repr(getattr(evalue, name))
|
||||
exception.append('\n<br>%s%s =\n%s' % (indent, name, value))
|
||||
|
||||
import traceback
|
||||
plaintrace = ''.join(traceback.format_exception(etype, evalue, etb))
|
||||
|
||||
return head + ''.join(frames) + ''.join(exception) + '''
|
||||
|
||||
|
||||
<!-- The above is a description of an error that occurred in a Python program.
|
||||
It is formatted for display in a Web browser because it appears that
|
||||
we are running in a CGI environment. In case you are viewing this
|
||||
message outside of a Web browser, here is the original error traceback:
|
||||
|
||||
%s
|
||||
-->
|
||||
''' % plaintrace
|
||||
|
||||
class Hook:
|
||||
def __init__(self, display=1, logdir=None):
|
||||
self.display = display # send tracebacks to browser if true
|
||||
self.logdir = logdir # log tracebacks to files if not None
|
||||
|
||||
def __call__(self, etype, evalue, etb):
|
||||
"""This hook can replace sys.excepthook (for Python 2.1 or higher)."""
|
||||
self.handle((etype, evalue, etb))
|
||||
|
||||
def handle(self, info=None):
|
||||
import sys, os
|
||||
info = info or sys.exc_info()
|
||||
text = 0
|
||||
print reset()
|
||||
|
||||
try:
|
||||
doc = html(*info)
|
||||
except: # just in case something goes wrong
|
||||
import traceback
|
||||
doc = ''.join(traceback.format_exception(*info))
|
||||
text = 1
|
||||
|
||||
if self.display:
|
||||
if text:
|
||||
doc = doc.replace('&', '&').replace('<', '<')
|
||||
print '<pre>', doc, '</pre>'
|
||||
else:
|
||||
print doc
|
||||
else:
|
||||
print '<p>A problem occurred in a Python script.'
|
||||
|
||||
if self.logdir is not None:
|
||||
import tempfile
|
||||
name = tempfile.mktemp(['.html', '.txt'][text])
|
||||
path = os.path.join(self.logdir, os.path.basename(name))
|
||||
try:
|
||||
file = open(path, 'w')
|
||||
file.write(doc)
|
||||
file.close()
|
||||
print '<p>%s contains the description of this error.' % path
|
||||
except:
|
||||
print '<p>Tried to write to %s, but failed.' % path
|
||||
|
||||
handler = Hook().handle
|
||||
def enable(display=1, logdir=None):
|
||||
import sys
|
||||
sys.excepthook = Hook(display, logdir)
|
||||
Loading…
Reference in New Issue