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121 lines
3.5 KiB
121 lines
3.5 KiB
3 years ago
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"""
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A module that implements tooling to enable easy warnings about deprecations.
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"""
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import logging
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import warnings
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from typing import Any, Optional, TextIO, Type, Union
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from pip._vendor.packaging.version import parse
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from pip import __version__ as current_version # NOTE: tests patch this name.
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DEPRECATION_MSG_PREFIX = "DEPRECATION: "
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class PipDeprecationWarning(Warning):
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pass
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_original_showwarning: Any = None
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# Warnings <-> Logging Integration
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def _showwarning(
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message: Union[Warning, str],
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category: Type[Warning],
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filename: str,
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lineno: int,
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file: Optional[TextIO] = None,
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line: Optional[str] = None,
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) -> None:
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if file is not None:
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if _original_showwarning is not None:
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_original_showwarning(message, category, filename, lineno, file, line)
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elif issubclass(category, PipDeprecationWarning):
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# We use a specially named logger which will handle all of the
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# deprecation messages for pip.
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logger = logging.getLogger("pip._internal.deprecations")
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logger.warning(message)
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else:
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_original_showwarning(message, category, filename, lineno, file, line)
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def install_warning_logger() -> None:
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# Enable our Deprecation Warnings
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warnings.simplefilter("default", PipDeprecationWarning, append=True)
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global _original_showwarning
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if _original_showwarning is None:
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_original_showwarning = warnings.showwarning
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warnings.showwarning = _showwarning
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def deprecated(
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*,
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reason: str,
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replacement: Optional[str],
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gone_in: Optional[str],
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feature_flag: Optional[str] = None,
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issue: Optional[int] = None,
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) -> None:
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"""Helper to deprecate existing functionality.
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reason:
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Textual reason shown to the user about why this functionality has
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been deprecated. Should be a complete sentence.
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replacement:
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Textual suggestion shown to the user about what alternative
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functionality they can use.
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gone_in:
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The version of pip does this functionality should get removed in.
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Raises an error if pip's current version is greater than or equal to
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this.
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feature_flag:
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Command-line flag of the form --use-feature={feature_flag} for testing
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upcoming functionality.
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issue:
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Issue number on the tracker that would serve as a useful place for
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users to find related discussion and provide feedback.
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"""
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# Determine whether or not the feature is already gone in this version.
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is_gone = gone_in is not None and parse(current_version) >= parse(gone_in)
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message_parts = [
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(reason, f"{DEPRECATION_MSG_PREFIX}{{}}"),
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(
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gone_in,
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"pip {} will enforce this behaviour change."
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if not is_gone
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else "Since pip {}, this is no longer supported.",
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),
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(
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replacement,
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"A possible replacement is {}.",
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),
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(
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feature_flag,
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"You can use the flag --use-feature={} to test the upcoming behaviour."
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if not is_gone
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else None,
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),
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(
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issue,
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"Discussion can be found at https://github.com/pypa/pip/issues/{}",
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),
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]
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message = " ".join(
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format_str.format(value)
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for value, format_str in message_parts
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if format_str is not None and value is not None
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)
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# Raise as an error if this behaviour is deprecated.
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if is_gone:
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raise PipDeprecationWarning(message)
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warnings.warn(message, category=PipDeprecationWarning, stacklevel=2)
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