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- __all__ = ()
- import concurrent.futures._base
- import reprlib
- from . import format_helpers
- Error = concurrent.futures._base.Error
- CancelledError = concurrent.futures.CancelledError
- TimeoutError = concurrent.futures.TimeoutError
- class InvalidStateError(Error):
- """The operation is not allowed in this state."""
- # States for Future.
- _PENDING = 'PENDING'
- _CANCELLED = 'CANCELLED'
- _FINISHED = 'FINISHED'
- def isfuture(obj):
- """Check for a Future.
- This returns True when obj is a Future instance or is advertising
- itself as duck-type compatible by setting _asyncio_future_blocking.
- See comment in Future for more details.
- """
- return (hasattr(obj.__class__, '_asyncio_future_blocking') and
- obj._asyncio_future_blocking is not None)
- def _format_callbacks(cb):
- """helper function for Future.__repr__"""
- size = len(cb)
- if not size:
- cb = ''
- def format_cb(callback):
- return format_helpers._format_callback_source(callback, ())
- if size == 1:
- cb = format_cb(cb[0][0])
- elif size == 2:
- cb = '{}, {}'.format(format_cb(cb[0][0]), format_cb(cb[1][0]))
- elif size > 2:
- cb = '{}, <{} more>, {}'.format(format_cb(cb[0][0]),
- size - 2,
- format_cb(cb[-1][0]))
- return f'cb=[{cb}]'
- def _future_repr_info(future):
- # (Future) -> str
- """helper function for Future.__repr__"""
- info = [future._state.lower()]
- if future._state == _FINISHED:
- if future._exception is not None:
- info.append(f'exception={future._exception!r}')
- else:
- # use reprlib to limit the length of the output, especially
- # for very long strings
- result = reprlib.repr(future._result)
- info.append(f'result={result}')
- if future._callbacks:
- info.append(_format_callbacks(future._callbacks))
- if future._source_traceback:
- frame = future._source_traceback[-1]
- info.append(f'created at {frame[0]}:{frame[1]}')
- return info
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