def bare_error(extrabody=None):
"""Produce status, headers, body for a critical error.
Returns a triple without calling any other questionable functions,
so it should be as error-free as possible. Call it from an HTTP server
if you get errors outside of the request.
If extrabody is None, a friendly but rather unhelpful error message
is set in the body. If extrabody is a string, it will be appended
as-is to the body.
"""
# The whole point of this function is to be a last line-of-defense
# in handling errors. That is, it must not raise any errors itself;
# it cannot be allowed to fail. Therefore, don't add to it!
# In particular, don't call any other CP functions.
body = ntob('Unrecoverable error in the server.')
if extrabody is not None:
if not isinstance(extrabody, bytes):
extrabody = extrabody.encode('utf-8')
body += ntob('\n') + extrabody
return (ntob('500 Internal Server Error'),
[(ntob('Content-Type'), ntob('text/plain')),
(ntob('Content-Length'), ntob(str(len(body)), 'ISO-8859-1'))],
[body])
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