Skip to content

decorative_secrets.utilities

get_logger

get_logger(
    name: str | None = None,
    level: int | None = None,
    formatter: (
        logging.Formatter
        | type[logging.Formatter]
        | str
        | None
    ) = None,
    stream: (
        typing.TextIO | pathlib.Path | str | None
    ) = None,
    *,
    propagate: bool | None = None
) -> logging.Logger

Get a non-blocking logger.

Parameters:

  • name (str | None, default: None ) –

    Logger name, typically the __name__ of the calling module.

  • level (int | None, default: None ) –

    Optional log level to set on the logger and handlers. If not specified, defaults to logging.INFO if creating a new logger, otherwise uses the existing logger's level.

  • formatter (logging.Formatter | type[logging.Formatter] | str | None, default: None ) –

    Optional formatter to use for the logger. Can be an instance of logging.Formatter, a subclass of logging.Formatter, or a format string.

  • propagate (bool | None, default: None ) –

    Whether the logger should propagate messages to the root logger. If None (the default), propagation is left unchanged for an existing logger and defaults to True for a new one.

  • stream (typing.TextIO | pathlib.Path | str | None, default: None ) –

    A file-like object or path to write the log to.

Example
import logging
import sys
from decorative_secrets.utilities import get_logger

log: logging.Logger = get_logger(
    __name__,
    formatter="%(asctime)s [%(levelname)s] %(message)s",
    stream=sys.stdout,
)
Source code in src/decorative_secrets/utilities.py
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
def get_logger(
    name: str | None = None,
    level: int | None = None,
    formatter: logging.Formatter | type[logging.Formatter] | str | None = None,
    stream: TextIO | Path | str | None = None,
    *,
    propagate: bool | None = None,
) -> logging.Logger:
    """
    Get a non-blocking logger.

    Parameters:
        name: Logger name, typically the `__name__` of the calling module.
        level: Optional log level to set on the logger and handlers. If not
            specified, defaults to `logging.INFO` if creating a new
            logger, otherwise uses the existing logger's level.
        formatter: Optional formatter to use for the logger. Can be an instance
            of `logging.Formatter`, a subclass of `logging.Formatter`, or a
            format string.
        propagate: Whether the logger should propagate messages to the root
            logger. If `None` (the default), propagation is left unchanged
            for an existing logger and defaults to `True` for a new one.
        stream: A file-like object or path to write the log to.

    Example:
        ```python
        import logging
        import sys
        from decorative_secrets.utilities import get_logger

        log: logging.Logger = get_logger(
            __name__,
            formatter="%(asctime)s [%(levelname)s] %(message)s",
            stream=sys.stdout,
        )
        ```
    """
    logger: logging.Logger = logging.getLogger(name)
    if logger.handlers:
        if propagate is not None:
            logger.propagate = propagate
        if level is not None:
            logger.setLevel(level)
            for handler in logger.handlers:
                handler.setLevel(level)
                # Also update the downstream handlers owned by the
                # `QueueListener`. The listener is created with
                # `respect_handler_level=True`, so a level set only on the
                # logger and its `QueueHandler` would still be enforced at
                # the original (higher) level here, dropping records the
                # logger now permits.
                listener: QueueListener | None = getattr(
                    handler, "listener", None
                )
                if listener is not None:
                    for downstream_handler in listener.handlers:
                        downstream_handler.setLevel(level)
    else:
        level = level if (level is not None) else logging.INFO
        logger.setLevel(level)
        logger.propagate = True if propagate is None else propagate
        log_queue: queue.Queue = queue.Queue(-1)
        log_queue_listener: QueueListener
        stream_handler: logging.StreamHandler
        if stream is not None:
            if isinstance(stream, str | Path):
                stream = open(stream, "w")  # noqa: SIM115
                atexit.register(stream.close)
            stream_handler = logging.StreamHandler(stream)
        else:
            stream_handler = logging.StreamHandler()
        stream_handler.setLevel(level)
        log_queue_listener = QueueListener(
            log_queue, stream_handler, respect_handler_level=True
        )
        queue_handler: QueueHandler = QueueHandler(log_queue)
        # Store the listener on the handler so a later `get_logger` call can
        # reach (and re-level) the listener's downstream handlers. The
        # stdlib `QueueHandler` has no `listener` attribute, so this is set
        # unconditionally rather than guarded behind `hasattr`.
        queue_handler.listener = log_queue_listener  # type: ignore[attr-defined]
        queue_handler.setLevel(level)
        if formatter is not None:
            stream_handler.setFormatter(
                logging.Formatter(formatter)
                if isinstance(formatter, str)
                else formatter()
                if isinstance(formatter, type)
                else formatter
            )
        logger.addHandler(queue_handler)
        log_queue_listener.start()
        atexit.register(log_queue_listener.stop)
    return logger

iscoroutinefunction

iscoroutinefunction(function: typing.Any) -> bool

An adaptation of asyncio.iscoroutinefunction

Source code in src/decorative_secrets/utilities.py
121
122
123
124
125
126
127
128
129
130
def iscoroutinefunction(function: Any) -> bool:
    """
    An adaptation of `asyncio.iscoroutinefunction`
    """
    if isinstance(function, partial):
        return iscoroutinefunction(function.func)
    return (
        inspect.iscoroutinefunction(function)
        or type(getattr(function, "_is_coroutine", None)) is object
    )

as_tuple

as_tuple(
    function: collections.abc.Callable[
        ...,
        collections.abc.Iterable[typing.Any]
        | collections.abc.Awaitable[
            collections.abc.Iterable[typing.Any]
        ],
    ],
) -> collections.abc.Callable[..., typing.Any]

This is a decorator which will return an iterable as a tuple.

Examples:

from decorative_secrets.utilities import as_tuple


@as_tuple
def get_numbers() -> Iterable[int]:
    yield 1
    yield 2
    yield 3


assert get_numbers() == (1, 2, 3)
Source code in src/decorative_secrets/utilities.py
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
def as_tuple(
    function: Callable[..., Iterable[Any] | Awaitable[Iterable[Any]]],
) -> Callable[..., Any]:
    """
    This is a decorator which will return an iterable as a tuple.

    Examples:
        ```python
        from decorative_secrets.utilities import as_tuple


        @as_tuple
        def get_numbers() -> Iterable[int]:
            yield 1
            yield 2
            yield 3


        assert get_numbers() == (1, 2, 3)
        ```
    """
    if iscoroutinefunction(function):

        @wraps(function)
        async def wrapper(*args: Any, **kwargs: Any) -> tuple[Any, ...]:
            return tuple(  # --
                await function(*args, **kwargs) or ()  # type: ignore[misc]
            )

    else:

        @wraps(function)
        def wrapper(*args: Any, **kwargs: Any) -> tuple[Any, ...]:
            return tuple(
                function(*args, **kwargs) or ()  # type: ignore[arg-type]
            )

    return wrapper

as_str

as_str(
    function: None = None, separator: str = ""
) -> collections.abc.Callable[
    ..., collections.abc.Callable[..., str]
]
as_str(
    function: collections.abc.Callable[
        ..., collections.abc.Iterable[str]
    ] = ...,
    separator: str = "",
) -> collections.abc.Callable[..., str]
as_str(
    function: (
        collections.abc.Callable[
            ..., collections.abc.Iterable[str]
        ]
        | collections.abc.Awaitable[
            collections.abc.Iterable[typing.Any]
        ]
        | None
    ) = None,
    separator: str = "",
) -> (
    collections.abc.Callable[
        ..., collections.abc.Callable[..., str]
    ]
    | collections.abc.Callable[..., str]
)
This decorator causes a function yielding an iterable of strings to
return a single string with the elements joined by the specified
`separator`.

Parameters:
    function: The function to decorate. If `None`, a decorating
        function is returned.
    separator: The string used to join the iterable elements.

Returns:
    A decorator which joins the iterable elements into a single string.

Examples:
    ```python
    from decorative_secrets.utilities import as_str


    @as_str(separator=", ")
    def get_fruits() -> Iterable[str]:
        yield "apple"
        yield "banana"
        yield "cherry"


    assert get_fruits() == "apple, banana, cherry"
    ```

    ```python
    from decorative_secrets.utilities import as_str


    @as_str
    def get_fruits() -> Iterable[str]:
        yield "apple

" yield "banana " yield "cherry"

    assert get_fruits() == "apple

banana cherry" ```

Source code in src/decorative_secrets/utilities.py
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
def as_str(
    function: Callable[..., Iterable[str]]
    | Awaitable[Iterable[Any]]
    | None = None,
    separator: str = "",
) -> Callable[..., Callable[..., str]] | Callable[..., str]:
    """
    This decorator causes a function yielding an iterable of strings to
    return a single string with the elements joined by the specified
    `separator`.

    Parameters:
        function: The function to decorate. If `None`, a decorating
            function is returned.
        separator: The string used to join the iterable elements.

    Returns:
        A decorator which joins the iterable elements into a single string.

    Examples:
        ```python
        from decorative_secrets.utilities import as_str


        @as_str(separator=", ")
        def get_fruits() -> Iterable[str]:
            yield "apple"
            yield "banana"
            yield "cherry"


        assert get_fruits() == "apple, banana, cherry"
        ```

        ```python
        from decorative_secrets.utilities import as_str


        @as_str
        def get_fruits() -> Iterable[str]:
            yield "apple\n"
            yield "banana\n"
            yield "cherry"


        assert get_fruits() == "apple\nbanana\ncherry"
        ```
    """

    def decorating_function(
        user_function: Callable[..., Iterable[str]],
    ) -> Callable[..., Any]:
        if iscoroutinefunction(user_function):

            @wraps(user_function)
            async def wrapper(*args: Any, **kwargs: Any) -> str:
                return separator.join(
                    await user_function(  # type: ignore[misc]
                        *args, **kwargs
                    )
                    or ()
                )

        else:

            @wraps(user_function)
            def wrapper(*args: Any, **kwargs: Any) -> str:
                return separator.join(user_function(*args, **kwargs) or ())

        return wrapper

    if function is None:
        return decorating_function
    return decorating_function(function)  # type: ignore[arg-type]

as_dict

as_dict(
    function: collections.abc.Callable[
        ...,
        collections.abc.Iterable[
            tuple[typing.Any, typing.Any]
        ]
        | collections.abc.Awaitable[
            collections.abc.Iterable[
                tuple[typing.Any, typing.Any]
            ]
        ],
    ],
) -> collections.abc.Callable[..., typing.Any]

This is a decorator which will return an iterable of key/value pairs as a dictionary.

Examples:

from decorative_secrets.utilities import as_dict


@as_dict
def get_settings() -> Iterable[tuple[str, Any]]:
    yield ("host", "localhost")
    yield ("port", 8080)
    yield ("debug", True)


assert get_settings() == (
    {"host": "localhost", "port": 8080, "debug": True}
)
Source code in src/decorative_secrets/utilities.py
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
def as_dict(
    function: Callable[
        ..., Iterable[tuple[Any, Any]] | Awaitable[Iterable[tuple[Any, Any]]]
    ],
) -> Callable[..., Any]:
    """
    This is a decorator which will return an iterable of key/value pairs
    as a dictionary.

    Examples:
        ```python
        from decorative_secrets.utilities import as_dict


        @as_dict
        def get_settings() -> Iterable[tuple[str, Any]]:
            yield ("host", "localhost")
            yield ("port", 8080)
            yield ("debug", True)


        assert get_settings() == (
            {"host": "localhost", "port": 8080, "debug": True}
        )
        ```
    """

    if iscoroutinefunction(function):

        @wraps(function)
        async def wrapper(*args: Any, **kwargs: Any) -> dict[Any, Any]:
            return dict(
                await function(*args, **kwargs) or ()  # type: ignore[misc]
            )

    else:

        @wraps(function)
        def wrapper(*args: Any, **kwargs: Any) -> dict[Any, Any]:
            return dict(
                function(*args, **kwargs) or ()  # type: ignore[arg-type]
            )

    return wrapper

as_iter

as_iter(
    function: collections.abc.Callable[
        ..., collections.abc.Iterable[typing.Any]
    ],
) -> collections.abc.Callable[..., typing.Any]

This is a decorator which will return an iterator for a function yielding an iterable.

Examples:

from decorative_secrets.utilities import as_iter
from collections.abc import Iterator


@as_iter
def get_settings() -> Iterable[tuple[str, Any]]:
    yield ("host", "localhost")
    yield ("port", 8080)
    yield ("debug", True)


assert issubclass(get_settings(), Iterator)
Source code in src/decorative_secrets/utilities.py
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
def as_iter(
    function: Callable[..., Iterable[Any]],
) -> Callable[..., Any]:
    """
    This is a decorator which will return an iterator for a function
    yielding an iterable.

    Examples:
        ```python
        from decorative_secrets.utilities import as_iter
        from collections.abc import Iterator


        @as_iter
        def get_settings() -> Iterable[tuple[str, Any]]:
            yield ("host", "localhost")
            yield ("port", 8080)
            yield ("debug", True)


        assert issubclass(get_settings(), Iterator)
        ```
    """

    if iscoroutinefunction(function):

        @wraps(function)
        async def wrapper(*args: Any, **kwargs: Any) -> Iterator[Any]:
            return iter(
                await function(*args, **kwargs) or ()  # type: ignore[misc]
            )

    else:

        @wraps(function)
        def wrapper(*args: Any, **kwargs: Any) -> Iterator[Any]:
            return iter(function(*args, **kwargs) or ())

    return wrapper

warn_retry_hook

warn_retry_hook(
    error: Exception,
    attempt_number: int,
    *args: typing.Any,
    **kwargs: typing.Any
) -> bool

This is a retry hook which will issue a warning and retry number whenever an error occurs.

Source code in src/decorative_secrets/utilities.py
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
def warn_retry_hook(
    error: Exception,
    attempt_number: int,
    *args: Any,  # noqa: ARG001
    **kwargs: Any,  # noqa: ARG001
) -> bool:
    """
    This is a retry hook which will issue a warning and retry number
    whenever an error occurs.
    """
    message: str = f"Attempt # {attempt_number} failed with error: {error}"
    warn(
        message,
        stacklevel=2,
    )
    return True

create_log_warning_retry_hook

create_log_warning_retry_hook(
    logger: (
        logging.Logger
        | collections.abc.Callable[[], logging.Logger]
    ),
) -> decorative_secrets.utilities.RetryHook

This factory creates a retry hook which logs warning using the provided logger.

Parameters:

  • logger (logging.Logger | collections.abc.Callable[[], logging.Logger]) –

    The logger to use for logging warnings, or a callable which

Source code in src/decorative_secrets/utilities.py
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
def create_log_warning_retry_hook(
    logger: logging.Logger | Callable[[], logging.Logger],
) -> RetryHook:
    """
    This factory creates a retry hook which logs warning using the provided
    logger.

    Parameters:
        logger: The logger to use for logging warnings, or a callable which
        returns a logger.
    """
    if not isinstance(logger, logging.Logger) and callable(logger):
        logger = logger()
    if not isinstance(logger, logging.Logger):
        raise TypeError(logger)

    def retry_hook(
        error: Exception,
        attempt_number: int,
        *args: Any,  # noqa: ARG001
        **kwargs: Any,  # noqa: ARG001
    ) -> bool:
        logger.warning(
            "Attempt # %d failed with error: %s",
            attempt_number,
            str(error),
            stacklevel=2,
        )
        return True

    return retry_hook

create_async_log_warning_retry_hook

create_async_log_warning_retry_hook(
    logger: logging.Logger,
) -> decorative_secrets.utilities.AsyncRetryHook

This factory creates an async retry hook which logs warning using the provided logger.

!!! Note Please make sure to use a non-blocking logger .

Parameters:

  • logger (logging.Logger) –

    The logger to use for logging warnings.

Source code in src/decorative_secrets/utilities.py
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
def create_async_log_warning_retry_hook(
    logger: logging.Logger,
) -> AsyncRetryHook:
    """
    This factory creates an async retry hook which logs warning using the
    provided logger.

    !!! Note
        Please make sure to use a [non-blocking logger
        ](https://docs.python.org/3/howto/logging-cookbook.html#dealing-with-handlers-that-block).

    Parameters:
        logger: The logger to use for logging warnings.
    """

    async def retry_hook(
        error: Exception,
        attempt_number: int,
        *args: Any,  # noqa: ARG001
        **kwargs: Any,  # noqa: ARG001
    ) -> bool:
        logger.warning(
            "Attempt # %d failed with error: %s",
            attempt_number,
            str(error),
            stacklevel=2,
        )
        return True

    return retry_hook

retry

retry(
    errors: tuple[type[Exception], ...],
    retry_hook: (
        decorative_secrets.utilities.RetryHook
        | decorative_secrets.utilities.AsyncRetryHook
    ) = decorative_secrets.utilities._default_retry_hook,
    number_of_attempts: int = 2,
) -> collections.abc.Callable

This is a decorator which will retry a function a specified number of times, with exponential backoff, if it raises one of the specified errors types.

Parameters:

  • errors (tuple[type[Exception], ...]) –

    A tuple of exception types which should trigger a retry.

  • retry_hook (decorative_secrets.utilities.RetryHook | decorative_secrets.utilities.AsyncRetryHook, default: decorative_secrets.utilities._default_retry_hook ) –

    A function which is called with the exception instance (optionally) and an attempt number when an error occurs. If this function returns False, the exception is re-raised and no further retries are attempted.

  • number_of_attempts (int, default: 2 ) –

    The total number of attempts to make, including the initial attempt.

Source code in src/decorative_secrets/utilities.py
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
def retry(  # noqa: C901
    errors: tuple[type[Exception], ...],
    retry_hook: RetryHook | AsyncRetryHook = _default_retry_hook,
    number_of_attempts: int = 2,
) -> Callable:
    """
    This is a decorator which will retry a function a specified
    number of times, with exponential backoff, if it raises one of the
    specified errors types.

    Parameters:
        errors: A tuple of exception types which should trigger a retry.
        retry_hook: A function which is called with the exception instance
            (optionally) and an attempt number when an error occurs. If this
            function returns `False`, the exception is re-raised and no further
            retries are attempted.
        number_of_attempts: The total number of attempts to make, including
            the initial attempt.
    """

    def decorating_function(function: Callable) -> Callable:
        if iscoroutinefunction(function):

            @wraps(function)
            async def wrapper(*args: Any, **kwargs: Any) -> Any:
                __attempt_number: int = kwargs.pop("__attempt_number", 1)
                if (number_of_attempts - __attempt_number) > 0:
                    # If `number_of_attempts` is greater than `attempt_number`,
                    # we have remaining attempts to try, so catch errors.
                    try:
                        return await function(*args, **kwargs)
                    except errors as error:
                        if not (
                            (
                                await retry_hook(  # type: ignore[misc]
                                    error, __attempt_number
                                )
                                if len(
                                    inspect.signature(retry_hook).parameters
                                )
                                > 1
                                else await retry_hook(  # type: ignore[misc]
                                    error
                                )
                            )
                            if iscoroutinefunction(retry_hook)
                            else (
                                retry_hook(error, __attempt_number)
                                if len(
                                    inspect.signature(retry_hook).parameters
                                )
                                > 1
                                else retry_hook(error)
                            )
                        ):
                            raise
                        await asyncio.sleep(2**__attempt_number)
                        __attempt_number += 1
                        return await wrapper(
                            *args, __attempt_number=__attempt_number, **kwargs
                        )
                # This is our last attempt, so just call the function.
                return await function(*args, **kwargs)

        else:

            @wraps(function)
            def wrapper(*args: Any, **kwargs: Any) -> Any:
                __attempt_number: int = kwargs.pop("__attempt_number", 1)
                if (number_of_attempts - __attempt_number) > 0:
                    try:
                        return function(*args, **kwargs)
                    except errors as error:
                        if not (
                            retry_hook(error, __attempt_number)
                            if len(inspect.signature(retry_hook).parameters)
                            > 1
                            else retry_hook(error)
                        ):
                            raise
                        sleep(2**__attempt_number)
                        __attempt_number += 1
                        return wrapper(
                            *args, __attempt_number=__attempt_number, **kwargs
                        )
                return function(*args, **kwargs)

        return wrapper

    return decorating_function

timeout

timeout(
    seconds: float, *, use_signals: bool | None = None
) -> collections.abc.Callable[
    [collections.abc.Callable], collections.abc.Callable
]

This is a decorator which enforces a maximum execution time on the decorated function. If the function does not return within seconds, a TimeoutError is raised.

This works for both synchronous and asynchronous functions:

  • Asynchronous functions are bounded using asyncio.wait, which cancels the coroutine on timeout. asyncio.wait is used in preference to asyncio.wait_for so the timeout does not rely on current_task(), which is unavailable once a running loop has been patched by nest_asyncio.
  • Synchronous functions are bounded using signal.SIGALRM when it is available, the call originates from the main thread, and no other timeout is already active, which interrupts the function in place.
  • Otherwise (for example on Windows, when called from a non-main thread, or when nested inside another timeout), synchronous functions are run in a daemon thread. The daemon thread cannot be killed, so it continues running to completion after the TimeoutError is raised; if it subsequently raises, that exception is logged rather than silently discarded. A daemon thread is used so that such a call cannot block interpreter shutdown.

Parameters:

  • seconds (float) –

    The maximum number of seconds to allow. Must be greater than zero.

  • use_signals (bool | None, default: None ) –

    If False, the SIGALRM strategy is passed over in favor of the daemon-thread strategy even when SIGALRM is available. If True or None, the SIGALRM strategy is used when available, and the daemon-thread strategy is used otherwise.

Examples:

from time import sleep

from decorative_secrets.utilities import timeout


@timeout(0.1)
def slow() -> str:
    sleep(1)
    return "done"


try:
    slow()
except TimeoutError:
    print("timed out")
Source code in src/decorative_secrets/utilities.py
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
def timeout(
    seconds: float,
    *,
    use_signals: bool | None = None,
) -> Callable[[Callable], Callable]:
    """
    This is a decorator which enforces a maximum execution time on the
    decorated function. If the function does not return within `seconds`,
    a `TimeoutError` is raised.

    This works for both synchronous and asynchronous functions:

    -   Asynchronous functions are bounded using `asyncio.wait`, which
        cancels the coroutine on timeout. `asyncio.wait` is used in
        preference to `asyncio.wait_for` so the timeout does not rely on
        `current_task()`, which is unavailable once a running loop has been
        patched by `nest_asyncio`.
    -   Synchronous functions are bounded using `signal.SIGALRM` when it is
        available, the call originates from the main thread, and no other
        `timeout` is already active, which interrupts the function in
        place.
    -   Otherwise (for example on Windows, when called from a non-main
        thread, or when nested inside another `timeout`), synchronous
        functions are run in a daemon thread. The daemon thread cannot be
        killed, so it continues running to completion after the
        `TimeoutError` is raised; if it subsequently raises, that exception
        is logged rather than silently discarded. A daemon thread is used
        so that such a call cannot block interpreter shutdown.

    Parameters:
        seconds: The maximum number of seconds to allow. Must be greater
            than zero.
        use_signals: If `False`, the `SIGALRM` strategy is passed over
            in favor of the daemon-thread strategy even when `SIGALRM` is
            available. If `True` or `None`, the `SIGALRM` strategy is used when
            available, and the daemon-thread strategy is used otherwise.

    Examples:
        ```python
        from time import sleep

        from decorative_secrets.utilities import timeout


        @timeout(0.1)
        def slow() -> str:
            sleep(1)
            return "done"


        try:
            slow()
        except TimeoutError:
            print("timed out")
        ```
    """
    if seconds <= 0:
        raise ValueError(seconds)

    def decorating_function(function: Callable) -> Callable:
        message: str = (
            f"{function.__qualname__} timed out after {seconds} seconds"
        )
        if iscoroutinefunction(function):

            @wraps(function)
            async def wrapper(*args: Any, **kwargs: Any) -> Any:
                # `asyncio.wait` (rather than `asyncio.wait_for`) is used so
                # the timeout does not depend on `current_task()`: on Python
                # 3.12+, `wait_for` delegates to `asyncio.timeouts.timeout`,
                # which raises `RuntimeError("Timeout should be used inside a
                # task")` when no current task is set -- as happens once
                # `nest_asyncio` has patched the running loop (see
                # `decorative_secrets._utilities.asyncio_run`).
                task: asyncio.Future = asyncio.ensure_future(
                    function(*args, **kwargs)
                )

                async def _cancel_and_drain() -> None:
                    # Cancel the inner task and await it so the cancellation
                    # propagates into the coroutine rather than leaving it
                    # running in the background (and so any exception it
                    # raises is retrieved rather than reported as "Task
                    # exception was never retrieved").
                    task.cancel()
                    with contextlib.suppress(
                        asyncio.CancelledError, Exception
                    ):
                        await task

                try:
                    await asyncio.wait({task}, timeout=seconds)
                except asyncio.CancelledError:
                    # The caller cancelled this wrapper; drain the inner
                    # task before propagating the cancellation.
                    await _cancel_and_drain()
                    raise
                if task.done():
                    # Completed within the limit: return its value, or
                    # re-raise the exception it raised.
                    return task.result()
                # The call exceeded the limit; the documented contract is
                # that a timed-out call always raises `TimeoutError`.
                await _cancel_and_drain()
                raise TimeoutError(message) from None

        else:

            @wraps(function)
            def wrapper(*args: Any, **kwargs: Any) -> Any:
                if (use_signals is not False) and _can_use_sigalrm():
                    return _run_with_sigalrm_timeout(
                        function, seconds, message, args, kwargs
                    )
                return _run_with_thread_timeout(
                    function, seconds, message, args, kwargs
                )

        return wrapper

    return decorating_function

get_exception_text

get_exception_text() -> str

When called within an exception, this function returns a text representation of the error matching what is found in traceback.print_exception, but is returned as a string value rather than printing.

Source code in src/decorative_secrets/utilities.py
796
797
798
799
800
801
802
803
def get_exception_text() -> str:
    """
    When called within an exception, this function returns a text
    representation of the error matching what is found in
    `traceback.print_exception`, but is returned as a string value rather than
    printing.
    """
    return "".join(format_exception(*sys.exc_info()))