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import sys
import traceback
def walk_exception_chain(exc, ignore_first=False, reverse=False):
l = _inner_walk_exception_chain(exc, ignore_first)
if reverse:
l = reversed(list(l))
return l
def _inner_walk_exception_chain(exc, ignore_first):
if not ignore_first:
yield exc
exc = getattr(exc, '__cause__', None)
while exc is not None:
yield exc
exc = getattr(exc, '__cause__', None)
def dump_error(raw_exc, msg=None, handle=sys.stderr, tb=None):
# force default output for exceptions
if getattr(handle, 'reset', False):
handle.write(handle.reset)
prefix = ''
if msg:
prefix = ' '
handle.write(msg.rstrip("\n") + ":\n")
if tb:
handle.write("Traceback follows:\n")
traceback.print_tb(tb, file=handle)
exc_strings = []
if raw_exc is not None:
for exc in walk_exception_chain(raw_exc):
exc_strings.extend(
prefix + x.strip()
for x in (x for x in str(exc).split("\n") if x))
if exc_strings:
if msg and tb:
handle.write(f"\n{raw_exc.__class__.__name__}:\n")
handle.write("\n".join(exc_strings))
handle.write("\n")
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