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//! Error types for the `Buffer` middleware.
use crate::BoxError;
use std::{fmt, sync::Arc};
/// An error produced by a [`Service`] wrapped by a [`Buffer`]
///
/// [`Service`]: crate::Service
/// [`Buffer`]: crate::buffer::Buffer
#[derive(Debug)]
pub struct ServiceError {
inner: Arc<BoxError>,
}
/// An error produced when the a buffer's worker closes unexpectedly.
pub struct Closed {
_p: (),
}
// ===== impl ServiceError =====
impl ServiceError {
pub(crate) fn new(inner: BoxError) -> ServiceError {
let inner = Arc::new(inner);
ServiceError { inner }
}
// Private to avoid exposing `Clone` trait as part of the public API
pub(crate) fn clone(&self) -> ServiceError {
ServiceError {
inner: self.inner.clone(),
}
}
}
impl fmt::Display for ServiceError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "buffered service failed: {}", self.inner)
}
}
impl std::error::Error for ServiceError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
Some(&**self.inner)
}
}
// ===== impl Closed =====
impl Closed {
pub(crate) fn new() -> Self {
Closed { _p: () }
}
}
impl fmt::Debug for Closed {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.debug_tuple("Closed").finish()
}
}
impl fmt::Display for Closed {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.write_str("buffer's worker closed unexpectedly")
}
}
impl std::error::Error for Closed {}
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