constellation-server 1.9.1

Pluggable authoritative DNS server. Entries can be added & removed from an HTTP REST API.
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// Constellation
//
// Pluggable authoritative DNS server
// Copyright: 2018, Valerian Saliou <valerian@valeriansaliou.name>
// License: Mozilla Public License v2.0 (MPL v2.0)

macro_rules! get_cache_store_client {
    ($pool:expr, $error:expr, $client:ident $code:block) => {
        // As the DNS server is mono-threaded, it is safe to perform a 'try_get' there, which does \
        //   not wait if no pool is available to serve request answer. This also prevents all \
        //   threads from being blocked in the event of a Redis failure, and thus allow \
        //   Constellation to serve DNS answers from its internal cache.
        match $pool.try_get() {
            Some(mut $client) => $code,
            None => {
                error!("failed getting a cache store client from pool");

                Err($error)
            }
        }
    };
}