c-ares-resolver 4.0.0

An asynchronous DNS resolver, backed by c-ares.
Documentation 
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use std::error;
use std::fmt;
use std::io;

use c_ares;

/// Error codes that the library might return.
#[derive(Debug)]
pub enum Error {
    /// An `io::Error`.
    Io(io::Error),

    /// A `c_ares::Error`.
    Ares(c_ares::Error),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Error::Io(ref err) => err.fmt(f),
            Error::Ares(ref err) => err.fmt(f),
        }
    }
}

impl error::Error for Error {
    fn description(&self) -> &str {
        match *self {
            Error::Io(ref err) => err.description(),
            Error::Ares(ref err) => err.description(),
        }
    }

    fn cause(&self) -> Option<&error::Error> {
        match *self {
            Error::Io(ref err) => Some(err),
            Error::Ares(ref err) => Some(err),
        }
    }
}

impl From<io::Error> for Error {
    fn from(err: io::Error) -> Error {
        Error::Io(err)
    }
}

impl From<c_ares::Error> for Error {
    fn from(err: c_ares::Error) -> Error {
        Error::Ares(err)
    }
}