preprintd 0.3.8

Printer swarm-worker daemon implementation for PreConnect.
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macro_rules! debug_log {
    ($l:expr, $($arg:tt)*) => {
        let _ = (|| {
            if *DEBUG {
                let format = format!(
                    "[{}] {}",
                    match $l {
                        LogLevel::Error => "ERR",
                        LogLevel::Warn => "WARNING",
                        LogLevel::Ok => "OK"
                    },
                    format_args!($($arg)*)
                );

                match $l {
                    LogLevel::Ok => println!("{}", format),
                    _ => eprintln!("{}", format)
                }
            }
        })();

    };
}

macro_rules! sock {
    ($x:ident, $h:ident, $p:ident, $t:expr) => {
        let $x = (|| -> std::io::Result<TcpStream> {
            let addrs = ($h, $p).to_socket_addrs()?;
            let mut last_error = None;

            for addr in addrs {
                match TcpStream::connect_timeout(&addr, $t) {
                    Ok(socket) => return Ok(socket),
                    Err(error) => last_error = Some(error),
                }
            }

            Err(last_error.unwrap_or_else(|| {
                std::io::Error::new(
                    std::io::ErrorKind::AddrNotAvailable,
                    "no socket addresses resolved",
                )
            }))
        })();
    };
}