-- This file is part of the Wire Server implementation. -- -- Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com> -- -- This program is free software: you can redistribute it and/or modify it under -- the terms of the GNU Affero General Public License as published by the Free -- Software Foundation, either version 3 of the License, or (at your option) any -- later version. -- -- This program is distributed in the hope that it will be useful, but WITHOUT -- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS -- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more -- details. -- -- You should have received a copy of the GNU Affero General Public License along -- with this program. If not, see <https://www.gnu.org/licenses/>. module Wire.Network.DNS.Helper where import Imports import Network.DNS -- | Set up a thread-safe resolver with a global cache. Records will only be -- re-resolved after their TTLs expire withCachingResolver :: ResolvConf -> (Resolver -> IO a) -> IO a withCachingResolver :: forall a. ResolvConf -> (Resolver -> IO a) -> IO a withCachingResolver ResolvConf conf Resolver -> IO a action = do let confWithCaching :: ResolvConf confWithCaching = ResolvConf conf {resolvCache = Just defaultCacheConf} ResolvSeed resolvSeed <- ResolvConf -> IO ResolvSeed makeResolvSeed ResolvConf confWithCaching ResolvSeed -> (Resolver -> IO a) -> IO a forall a. ResolvSeed -> (Resolver -> IO a) -> IO a withResolver ResolvSeed resolvSeed Resolver -> IO a action