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use std::convert::Infallible;
use std::error::Error as StdError;
use std::fmt;
type BoxError = Box<dyn std::error::Error + Send + Sync>;
/// Errors that can happen inside warp.
pub struct Error {
inner: BoxError,
}
impl Error {
pub(crate) fn new<E: Into<BoxError>>(err: E) -> Error {
Error { inner: err.into() }
}
}
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// Skip showing worthless `Error { .. }` wrapper.
fmt::Debug::fmt(&self.inner, f)
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(&self.inner, f)
}
}
impl StdError for Error {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
Some(self.inner.as_ref())
}
}
impl From<Infallible> for Error {
fn from(infallible: Infallible) -> Error {
match infallible {}
}
}
#[test]
fn error_size_of() {
assert_eq!(
::std::mem::size_of::<Error>(),
::std::mem::size_of::<usize>() * 2
);
}
#[test]
fn error_source() {
let e = Error::new(std::fmt::Error {});
assert!(e.source().unwrap().is::<std::fmt::Error>());
}
macro_rules! unit_error {
(
$(#[$docs:meta])*
$pub:vis $typ:ident: $display:literal
) => (
$(#[$docs])*
$pub struct $typ { _p: (), }
impl ::std::fmt::Debug for $typ {
fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
f.debug_struct(stringify!($typ)).finish()
}
}
impl ::std::fmt::Display for $typ {
fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
f.write_str($display)
}
}
impl ::std::error::Error for $typ {}
)
}