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import sys
import traceback
import cgi
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
from paste.exceptions import formatter, collector, reporter
class ErrorMiddleware(object):
def __init__(self, application, show_exceptions=True,
email_exceptions_to=[], smtp_server='localhost'):
self.application = application
self.show_exceptions = show_exceptions
self.email_exceptions_to = email_exceptions_to
self.smtp_server = smtp_server
def __call__(self, environ, start_response):
# We want to be careful about not sending headers twice,
# and the content type that the app has committed to (if there
# is an exception in the iterator body of the response)
started = []
def detect_start_response(status, headers):
started.append(True)
return start_response(status, headers)
try:
app_iter = self.application(environ, detect_start_response)
return self.catching_iter(app_iter, environ)
except:
if not started:
start_response('500 Internal Server Error',
[('content-type', 'text/html')])
# @@: it would be nice to deal with bad content types here
dummy_file = StringIO()
response = self.exception_handler(sys.exc_info(), environ)
return [response]
def catching_iter(self, iter, environ):
if not iter:
raise StopIteration
error_on_close = False
try:
for v in iter:
yield v
if hasattr(iter, 'close'):
error_on_close = True
iter.close()
except:
response = self.exception_handler(sys.exc_info(), environ)
if not error_on_close and hasattr(iter, 'close'):
try:
iter.close()
except:
close_response = self.exception_handler(
sys.exc_info(), environ)
response += (
'<hr noshade>Error in .close():<br>%s'
% close_response)
yield response
def exception_handler(self, exc_info, environ):
reported = False
exc_data = collector.collect_exception(*exc_info)
conf = environ.get('paste.config', {})
extra_data = ''
if conf.get('error_email'):
rep = reporter.EmailReporter(
to_addresses=conf['error_email'],
from_address=conf.get('error_email_from', 'errors@localhost'),
smtp_server=conf.get('smtp_server', 'localhost'),
subject_prefix=conf.get('error_subject_prefix', ''))
extra_data += self.send_report(rep, exc_data)
reported = True
if conf.get('error_log'):
rep = reporter.LogReporter(
filename=conf['error_log'])
extra_data += self.send_report(rep, exc_data)
# Well, this isn't really true, is it?
reported = True
if conf.get('show_exceptions_in_error_log', True):
rep = reporter.FileReporter(
file=environ['wsgi.errors'])
extra_data += self.send_report(rep, exc_data)
# Well, this isn't really true, is it?
reported = True
if conf.get('debug', False):
html = self.error_template(
formatter.format_html(exc_data), extra_data)
reported = True
else:
html = self.error_template(
'''
An error occurred. See the error logs for more information.
(Turn debug on to display exception reports here)
''', '')
if not reported:
stderr = environ['wsgi.errors']
err_report = formatter.format_text(exc_data, show_hidden_frames=True)
err_report += '\n' + '-'*60 + '\n'
stderr.write(err_report)
return html
def error_template(self, exception, extra):
return '''
<html>
<head>
<title>Server Error</title>
</head>
<body>
<h1>Server Error</h1>
%s
%s
</body>
</html>''' % (exception, extra)
def send_report(self, reporter, exc_data):
try:
reporter.report(exc_data)
except:
output = StringIO()
traceback.print_exc(file=output)
return """
<p>Additionally an error occurred while sending the %s report:
<pre>%s</pre>
</p>""" % (
cgi.escape(str(reporter)), output.getvalue())
else:
return ''
|
