ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / lib / python3.9 / site-packages / dns

# 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)
    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>=41"],
    "doh": ["httpcore>=1.0.0", "httpx>=0.26.0", "h2>=4.1.0"],
    "doq": ["aioquic>=0.9.25"],
    "idna": ["idna>=3.6"],
    "trio": ["trio>=0.23"],
    "wmi": ["wmi>=1.5.1"],
    ### END generated requirements
}

[-] enum.py [edit]
[-] rdata.py [edit]
[-] resolver.py [edit]
[-] _asyncbackend.py [edit]
[-] message.py [edit]
[-] e164.py [edit]
[+] rdtypes
[-] win32util.py [edit]
[-] zone.py [edit]
[-] versioned.py [edit]
[-] tokenizer.py [edit]
[-] tsig.py [edit]
[-] xfr.py [edit]
[-] tsigkeyring.py [edit]
[-] set.py [edit]
[-] rdataset.py [edit]
[-] dnssec.py [edit]
[-] namedict.py [edit]
[-] nameserver.py [edit]
[-] wire.py [edit]
[-] _immutable_ctx.py [edit]
[-] immutable.py [edit]
[-] opcode.py [edit]
[-] ttl.py [edit]
[-] asyncresolver.py [edit]
[-] __init__.py [edit]
[-] name.py [edit]
[-] _ddr.py [edit]
[-] rdatatype.py [edit]
[-] rcode.py [edit]
[-] rrset.py [edit]
[-] zonefile.py [edit]
[-] edns.py [edit]
[-] renderer.py [edit]
[+] ..
[-] _features.py [edit]
[-] zonetypes.py [edit]
[-] asyncquery.py [edit]
[-] dnssectypes.py [edit]
[-] grange.py [edit]
[-] transaction.py [edit]
[-] asyncbackend.py [edit]
[-] reversename.py [edit]
[+] dnssecalgs
[-] entropy.py [edit]
[-] ipv4.py [edit]
[-] inet.py [edit]
[-] version.py [edit]
[-] _asyncio_backend.py [edit]
[+] __pycache__
[-] update.py [edit]
[-] exception.py [edit]
[-] ipv6.py [edit]
[+] quic
[-] serial.py [edit]
[-] node.py [edit]
[-] flags.py [edit]
[-] rdataclass.py [edit]
[-] query.py [edit]