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use std::{error::Error as StdError, fmt, io};
pub type DiscoveryResult<T> = Result<T, DiscoveryError>;
#[derive(Debug)]
pub struct DiscoveryError(Box<ErrorKind>);
impl DiscoveryError {
pub fn new(kind: ErrorKind) -> Self {
DiscoveryError(Box::new(kind))
}
pub fn new_other(s: &str) -> Self {
DiscoveryError::new(ErrorKind::Other(s.to_owned()))
}
pub fn kind(&self) -> &ErrorKind {
&self.0
}
pub fn into_kind(self) -> ErrorKind {
*self.0
}
}
#[derive(Debug)]
pub enum ErrorKind {
Io(io::Error),
Other(String),
#[doc(hidden)]
__Nonexhaustive,
}
impl StdError for DiscoveryError {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
match *self.0 {
ErrorKind::Io(ref err) => Some(err),
ErrorKind::Other(ref _s) => None,
_ => unreachable!(),
}
}
}
impl fmt::Display for DiscoveryError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self.0 {
ErrorKind::Io(ref err) => err.fmt(f),
ErrorKind::Other(ref s) => write!(f, "Unknown error encountered: '{}'.", s),
_ => unreachable!(),
}
}
}
impl From<io::Error> for DiscoveryError {
fn from(err: io::Error) -> Self {
DiscoveryError::new(ErrorKind::Io(err))
}
}