//! Errors coming from the DNS resolver

use hickory_net::NetError;

use thiserror::Error;

use tor_error::Bug;

/// An error representing a failed DNS lookup.

#[derive(Clone, Debug, Error)]

pub(crate) enum LookupError {

    /// The hostname from the RESOLVE message was not valid ASCII.

    #[error("Hostname is not ASCII")]

    NonAsciiHostname,

    /// An error coming from hickory

    #[error("failed to resolve name")]

    Hickory(#[from] NetError),

    /// An internal error

    #[error("internal error")]

    Bug(#[from] Bug),

}

impl LookupError {

    /// Whether this is a transient error

        use LookupError as LE;

            LE::Hickory(_) => {

                // TODO(relay): not all of these are transient!

                // We should see if the hickory folks would be happy with us

                // adding NetError::is_transient() method,

                // or, alternatively, just match on the inner error here

            }

        }

}