mirror of
https://github.com/ceph/ceph
synced 2024-12-19 18:02:46 +00:00
44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
import contextlib
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import sys
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import logging
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log = logging.getLogger(__name__)
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@contextlib.contextmanager
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def nested(*managers):
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"""
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Like contextlib.nested but takes callables returning context
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managers, to avoid the major reason why contextlib.nested was
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deprecated.
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This version also logs any exceptions early, much like run_tasks,
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to ease debugging. TODO combine nested and run_tasks.
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"""
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exits = []
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vars = []
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exc = (None, None, None)
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try:
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for mgr_fn in managers:
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mgr = mgr_fn()
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exit = mgr.__exit__
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enter = mgr.__enter__
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vars.append(enter())
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exits.append(exit)
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yield vars
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except Exception:
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log.exception('Saw exception from nested tasks')
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exc = sys.exc_info()
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finally:
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while exits:
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exit = exits.pop()
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try:
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if exit(*exc):
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exc = (None, None, None)
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except Exception:
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exc = sys.exc_info()
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if exc != (None, None, None):
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# Don't rely on sys.exc_info() still containing
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# the right information. Another exception may
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# have been raised and caught by an exit method
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raise exc[0], exc[1], exc[2]
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