mhost 0.11.3

Fast, async DNS lookup library and CLI -- modern dig/host replacement with parallel multi-server queries, DoH, DoT, subdomain discovery, and zone verification
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// Copyright 2017-2021 Lukas Pustina <lukas@pustina.de>
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

pub mod logging {
    use std::sync::Once;

    use tracing::subscriber::set_global_default;
    use tracing_log::LogTracer;
    use tracing_subscriber::fmt;
    use tracing_subscriber::layer::SubscriberExt;
    use tracing_subscriber::EnvFilter;

    static INIT: Once = Once::new();

    pub fn init() {
        INIT.call_once(|| {
            // Subscribe to all log crate log messages and transform them to a tracing events
            LogTracer::init().expect("failed to init logging for testing");

            let filter = if std::env::var_os("RUST_LOG").is_some() {
                // This is controlled by the env variable RUST_LOG
                EnvFilter::from_default_env()
            } else {
                // If RUST_LOG is not set
                EnvFilter::from(format!("{}=info", env!("CARGO_CRATE_NAME")))
            };

            let fmt = fmt::layer()
                .with_test_writer()
                .with_ansi(true)
                .with_thread_ids(true)
                .with_thread_names(true)
                .with_target(false);

            let registry = tracing_subscriber::registry().with(filter).with(fmt);
            set_global_default(registry).expect("failed to init tracing for testing");
        });
    }
}