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Edit File : _features.py \| Size : 2.43 KB
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license import importlib.metadata import itertools import string from typing import Dict, List, Tuple def _tuple_from_text(version: str) -> Tuple: text_parts = version.split(".") int_parts = [] for text_part in text_parts: digit_prefix = "".join( itertools.takewhile(lambda x: x in string.digits, text_part) ) try: int_parts.append(int(digit_prefix)) except Exception: break return tuple(int_parts) def _version_check( requirement: str, ) -> bool: """Is the requirement fulfilled? The requirement must be of the form package>=version """ package, minimum = requirement.split(">=") try: version = importlib.metadata.version(package) # This shouldn't happen, but it apparently can. if version is None: return False except Exception: return False t_version = _tuple_from_text(version) t_minimum = _tuple_from_text(minimum) if t_version < t_minimum: return False return True _cache: Dict[str, bool] = {} def have(feature: str) -> bool: """Is feature available? This tests if all optional packages needed for the feature are available and recent enough. Returns ``True`` if the feature is available, and ``False`` if it is not or if metadata is missing. """ value = _cache.get(feature) if value is not None: return value requirements = _requirements.get(feature) if requirements is None: # we make a cache entry here for consistency not performance _cache[feature] = False return False ok = True for requirement in requirements: if not _version_check(requirement): ok = False break _cache[feature] = ok return ok def force(feature: str, enabled: bool) -> None: """Force the status of feature to be enabled. This method is provided as a workaround for any cases where importlib.metadata is ineffective, or for testing. """ _cache[feature] = enabled _requirements: Dict[str, List[str]] = { ### BEGIN generated requirements "dnssec": ["cryptography>=43"], "doh": ["httpcore>=1.0.0", "httpx>=0.26.0", "h2>=4.1.0"], "doq": ["aioquic>=1.0.0"], "idna": ["idna>=3.7"], "trio": ["trio>=0.23"], "wmi": ["wmi>=1.5.1"], ### END generated requirements } Back

Edit File : _features.py | Size : 2.43 KB

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

import importlib.metadata
import itertools
import string
from typing import Dict, List, Tuple

def _tuple_from_text(version: str) -> Tuple:
    text_parts = version.split(".")
    int_parts = []
    for text_part in text_parts:
        digit_prefix = "".join(
            itertools.takewhile(lambda x: x in string.digits, text_part)
        )
        try:
            int_parts.append(int(digit_prefix))
        except Exception:
            break
    return tuple(int_parts)

def _version_check(
    requirement: str,
) -> bool:
    """Is the requirement fulfilled?

The requirement must be of the form

package>=version
    """
    package, minimum = requirement.split(">=")
    try:
        version = importlib.metadata.version(package)
        # This shouldn't happen, but it apparently can.
        if version is None:
            return False
    except Exception:
        return False
    t_version = _tuple_from_text(version)
    t_minimum = _tuple_from_text(minimum)
    if t_version < t_minimum:
        return False
    return True

_cache: Dict[str, bool] = {}

def have(feature: str) -> bool:
    """Is *feature* available?

This tests if all optional packages needed for the
    feature are available and recent enough.

Returns ``True`` if the feature is available,
    and ``False`` if it is not or if metadata is
    missing.
    """
    value = _cache.get(feature)
    if value is not None:
        return value
    requirements = _requirements.get(feature)
    if requirements is None:
        # we make a cache entry here for consistency not performance
        _cache[feature] = False
        return False
    ok = True
    for requirement in requirements:
        if not _version_check(requirement):
            ok = False
            break
    _cache[feature] = ok
    return ok

def force(feature: str, enabled: bool) -> None:
    """Force the status of *feature* to be *enabled*.

This method is provided as a workaround for any cases
    where importlib.metadata is ineffective, or for testing.
    """
    _cache[feature] = enabled

_requirements: Dict[str, List[str]] = {
    ### BEGIN generated requirements
    "dnssec": ["cryptography>=43"],
    "doh": ["httpcore>=1.0.0", "httpx>=0.26.0", "h2>=4.1.0"],
    "doq": ["aioquic>=1.0.0"],
    "idna": ["idna>=3.7"],
    "trio": ["trio>=0.23"],
    "wmi": ["wmi>=1.5.1"],
    ### END generated requirements
}

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