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
Documentation 
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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.

use std::env;
use std::time::Instant;

use mhost::resolver::{MultiQuery, ResolverGroupBuilder};
use mhost::statistics::Statistics;
use mhost::RecordType;

#[tokio::main]
async fn main() {
    let name = env::args().nth(1).unwrap_or_else(|| "www.example.com".to_string());

    let resolvers = ResolverGroupBuilder::new()
        .system()
        .build()
        .await
        .expect("failed to create system resolvers");

    let mq = MultiQuery::multi_record(name, vec![RecordType::A, RecordType::AAAA, RecordType::TXT])
        .expect("failed to create multi-query");
    let start_time = Instant::now();
    let lookups = resolvers.lookup(mq).await.expect("failed to execute lookups");
    let total_run_time = Instant::now() - start_time;

    //println!("Multi-Lookup results: {:#?}", lookups);

    let successes = lookups.iter().filter(|x| x.result().is_response()).count();
    println!("Multi-Lookup successful results: {}/{}", successes, lookups.len());

    let failures: Vec<_> = lookups.iter().filter(|x| !x.result().is_response()).collect();
    println!("Multi-Lookup failed results: {:#?}", failures.len());

    let statistics = lookups.statistics();
    println!("Statistics: {:#?}", statistics);

    println!(
        "Received {} within {} ms of total run time.",
        statistics,
        total_run_time.as_millis()
    );
}