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"""
A module that implements tooling to enable easy warnings about deprecations.
"""
import logging
import warnings
from typing import Any, Optional, TextIO, Type, Union
from pip._vendor.packaging.version import parse
from pip import __version__ as current_version # NOTE: tests patch this name.
DEPRECATION_MSG_PREFIX = "DEPRECATION: "
class PipDeprecationWarning(Warning):
pass
_original_showwarning: Any = None
# Warnings <-> Logging Integration
def _showwarning(
message: Union[Warning, str],
category: Type[Warning],
filename: str,
lineno: int,
file: Optional[TextIO] = None,
line: Optional[str] = None,
) -> None:
if file is not None:
if _original_showwarning is not None:
_original_showwarning(message, category, filename, lineno, file, line)
elif issubclass(category, PipDeprecationWarning):
# We use a specially named logger which will handle all of the
# deprecation messages for pip.
logger = logging.getLogger("pip._internal.deprecations")
logger.warning(message)
else:
_original_showwarning(message, category, filename, lineno, file, line)
def install_warning_logger() -> None:
# Enable our Deprecation Warnings
warnings.simplefilter("default", PipDeprecationWarning, append=True)
global _original_showwarning
if _original_showwarning is None:
_original_showwarning = warnings.showwarning
warnings.showwarning = _showwarning
def deprecated(
*,
reason: str,
replacement: Optional[str],
gone_in: Optional[str],
feature_flag: Optional[str] = None,
issue: Optional[int] = None,
) -> None:
"""Helper to deprecate existing functionality.
reason:
Textual reason shown to the user about why this functionality has
been deprecated. Should be a complete sentence.
replacement:
Textual suggestion shown to the user about what alternative
functionality they can use.
gone_in:
The version of pip does this functionality should get removed in.
Raises an error if pip's current version is greater than or equal to
this.
feature_flag:
Command-line flag of the form --use-feature={feature_flag} for testing
upcoming functionality.
issue:
Issue number on the tracker that would serve as a useful place for
users to find related discussion and provide feedback.
"""
# Determine whether or not the feature is already gone in this version.
is_gone = gone_in is not None and parse(current_version) >= parse(gone_in)
message_parts = [
(reason, f"{DEPRECATION_MSG_PREFIX}{{}}"),
(
gone_in,
"pip {} will enforce this behaviour change."
if not is_gone
else "Since pip {}, this is no longer supported.",
),
(
replacement,
"A possible replacement is {}.",
),
(
feature_flag,
"You can use the flag --use-feature={} to test the upcoming behaviour."
if not is_gone
else None,
),
(
issue,
"Discussion can be found at https://github.com/pypa/pip/issues/{}",
),
]
message = " ".join(
format_str.format(value)
for value, format_str in message_parts
if format_str is not None and value is not None
)
# Raise as an error if this behaviour is deprecated.
if is_gone:
raise PipDeprecationWarning(message)
warnings.warn(message, category=PipDeprecationWarning, stacklevel=2)
class LegacyInstallReason:
def __init__(
self,
reason: str,
replacement: Optional[str] = None,
gone_in: Optional[str] = None,
feature_flag: Optional[str] = None,
issue: Optional[int] = None,
emit_after_success: bool = False,
emit_before_install: bool = False,
):
self._reason = reason
self._replacement = replacement
self._gone_in = gone_in
self._feature_flag = feature_flag
self._issue = issue
self.emit_after_success = emit_after_success
self.emit_before_install = emit_before_install
def emit_deprecation(self, name: str) -> None:
deprecated(
reason=self._reason.format(name=name),
replacement=self._replacement,
gone_in=self._gone_in,
feature_flag=self._feature_flag,
issue=self._issue,
)
LegacyInstallReasonFailedBdistWheel = LegacyInstallReason(
reason=(
"{name} was installed using the legacy 'setup.py install' "
"method, because a wheel could not be built for it."
),
replacement="to fix the wheel build issue reported above",
gone_in="23.1",
issue=8368,
emit_after_success=True,
)
LegacyInstallReasonMissingWheelPackage = LegacyInstallReason(
reason=(
"{name} is being installed using the legacy "
"'setup.py install' method, because it does not have a "
"'pyproject.toml' and the 'wheel' package "
"is not installed."
),
replacement="to enable the '--use-pep517' option",
gone_in="23.1",
issue=8559,
emit_before_install=True,
)
LegacyInstallReasonNoBinaryForcesSetuptoolsInstall = LegacyInstallReason(
reason=(
"{name} is being installed using the legacy "
"'setup.py install' method, because the '--no-binary' option was enabled "
"for it and this currently disables local wheel building for projects that "
"don't have a 'pyproject.toml' file."
),
replacement="to enable the '--use-pep517' option",
gone_in="23.1",
issue=11451,
emit_before_install=True,
)
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