orengine 0.7.0-alpha.1

Optimized ring engine for Rust. It is a lighter and faster asynchronous library than tokio-rs, async-std, may, and even smol.
Documentation 
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use std::io;

/// `EachAddrRes` is used to return results from `each_addr`.
///
/// When successful, it contains an `Ok(R)` variant.
///
/// It contains a last error in an `Err` variant.
///
/// By default, it contains `None`.
pub(crate) enum EachAddrRes<R> {
    Ok(R),
    Err(io::Error),
    None,
}

/// `each_addr` is a macro that will iterate over the addresses in `addrs` and call `f` for each one
/// before first successful connection or the last address.
#[macro_export]
macro_rules! each_addr {
    ($addrs: expr, $f: expr) => {{
        use $crate::utils::each_addr::EachAddrRes;

        let addrs = match std::net::ToSocketAddrs::to_socket_addrs($addrs) {
            Ok(addrs) => addrs,
            Err(e) => return Err(e),
        };

        let mut res = EachAddrRes::None;
        for addr in addrs {
            match $f(addr).await {
                Ok(connect_res) => {
                    res = EachAddrRes::Ok(connect_res);
                    break;
                }
                Err(error) => {
                    res = EachAddrRes::Err(error);
                }
            }
        }

        match res {
            EachAddrRes::Ok(res) => std::io::Result::Ok(res),
            EachAddrRes::Err(err) => std::io::Result::Err(err),
            EachAddrRes::None => std::io::Result::Err(std::io::Error::new(
                std::io::ErrorKind::InvalidInput,
                "could not resolve to any addresses",
            )),
        }
    }};
}

/// `each_addr_sync` is a macro that will iterate over the addresses in `addrs` and call
/// `f` for each one before first successful connection or the last address.
#[macro_export]
macro_rules! each_addr_sync {
    ($addrs: expr, $f: expr) => {{
        use $crate::utils::each_addr::EachAddrRes;

        let addrs = match std::net::ToSocketAddrs::to_socket_addrs($addrs) {
            Ok(addrs) => addrs,
            Err(e) => return Err(e),
        };

        let mut res = EachAddrRes::None;
        for addr in addrs {
            match $f(addr) {
                Ok(connect_res) => {
                    res = EachAddrRes::Ok(connect_res);
                    break;
                }
                Err(error) => {
                    res = EachAddrRes::Err(error);
                }
            }
        }

        match res {
            EachAddrRes::Ok(res) => std::io::Result::Ok(res),
            EachAddrRes::Err(err) => std::io::Result::Err(err),
            EachAddrRes::None => std::io::Result::Err(std::io::Error::new(
                std::io::ErrorKind::InvalidInput,
                "could not resolve to any addresses",
            )),
        }
    }};
}