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"""
The tool to check the availability or syntax of domain, IP or URL.
::
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██████╔╝ ╚████╔╝ █████╗ ██║ ██║██╔██╗ ██║██║ █████╗ ██████╔╝██║ █████╗
██╔═══╝ ╚██╔╝ ██╔══╝ ██║ ██║██║╚██╗██║██║ ██╔══╝ ██╔══██╗██║ ██╔══╝
██║ ██║ ██║ ╚██████╔╝██║ ╚████║╚██████╗███████╗██████╔╝███████╗███████╗
╚═╝ ╚═╝ ╚═╝ ╚═════╝ ╚═╝ ╚═══╝ ╚═════╝╚══════╝╚═════╝ ╚══════╝╚══════╝
Provides a way to provide the nameserver to use.
Author:
Nissar Chababy, @funilrys, contactTATAfunilrysTODTODcom
Special thanks:
https://pyfunceble.github.io/#/special-thanks
Contributors:
https://pyfunceble.github.io/#/contributors
Project link:
https://github.com/funilrys/PyFunceble
Project documentation:
https://docs.pyfunceble.com
Project homepage:
https://pyfunceble.github.io/
License:
::
Copyright 2017, 2018, 2019, 2020, 2022, 2023, 2024, 2025 Nissar Chababy
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
from typing import List, Optional, Union
import dns.resolver
import PyFunceble.facility
import PyFunceble.storage
from PyFunceble.query.dns.nameserver import Nameservers
class Resolver:
"""
Provides the right resolver.
:param nameservers:
The list of nameservers to communicate with.
"""
STD_TIMEOUT: float = 5.0
_timeout: float = 3.0
_nameservers: Nameservers = None
_internal_resolver: Optional[dns.resolver.Resolver] = None
def __init__(
self, nameservers: Optional[List[str]] = None, timeout: Optional[float] = None
) -> None:
self._nameservers = Nameservers()
if nameservers is not None:
self.nameservers = nameservers
else:
self.nameservers.guess_and_set_nameservers()
if timeout is not None:
self.timeout = timeout
else:
self.guess_and_set_timeout()
@property
def resolver(self) -> dns.resolver.Resolver:
"""
Provides the resolver to work with.
"""
if not self._internal_resolver:
if self.get_raw_nameservers():
self._internal_resolver = dns.resolver.Resolver(configure=False)
else: # pragma: no cover ## I don't want to play with the default resolver.
self._internal_resolver = dns.resolver.Resolver()
self._internal_resolver.lifetime = self.timeout + 2.0
self._internal_resolver.timeout = self.timeout
self._internal_resolver.nameservers = self.get_raw_nameservers()
self._internal_resolver.nameserver_ports = self.get_raw_nameserver_ports()
return self._internal_resolver
@property
def nameservers(self) -> Nameservers:
"""
Provides the nameservers to use.
"""
return self._nameservers
@nameservers.setter
def nameservers(self, value: List[str]) -> None:
"""
Sets the nameservers to use.
"""
self.nameservers.set_nameservers(value)
self._internal_resolver = None # Invalidate
def set_nameservers(self, value: List[str]) -> "Resolver":
"""
Sets the given nameserver.
"""
self.nameservers = value
return self
@property
def timeout(self) -> float:
"""
Provides the timeout to use.
"""
return self._timeout
@timeout.setter
def timeout(self, value: float) -> None:
"""
Sets the timeout to use.
"""
if not isinstance(value, (float, int)):
raise TypeError(f"<value> should be {float}, {type(value)} given.")
self._timeout = float(value)
self._internal_resolver = None # Invalidate
def set_timeout(self, value: Union[float, int]) -> "Resolver":
"""
Sets the timeout of a query.
"""
self.timeout = value
return self
def get_raw_nameservers(self) -> Optional[List[str]]:
"""
Provides the currently set list of nameserver.
"""
return self.nameservers.get_nameservers()
def get_raw_nameserver_ports(self) -> Optional[dict]:
"""
Provides the currently set list of nameserver ports.
"""
return self.nameservers.get_nameserver_ports()
def guess_and_set_timeout(self) -> "Resolver":
"""
Tries to guess the the timeout from the configuration.
"""
if PyFunceble.facility.ConfigLoader.is_already_loaded():
self.timeout = PyFunceble.storage.CONFIGURATION.lookup.timeout
else:
self.timeout = self.STD_TIMEOUT
return self
def guess_all_settings(
self,
) -> "Resolver": # pragma: no cover ## Method themselves are more important
"""
Try to guess all settings.
"""
to_ignore = ["guess_all_settings"]
for method in dir(self):
if method in to_ignore or not method.startswith("guess_"):
continue
getattr(self, method)()
return self
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