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use std::{
pin::Pin,
task::{Context, Poll},
};
use futures_util::{Future, FutureExt};
use http::StatusCode;
use pin_project_lite::pin_project;
use tower::{Layer, Service};
use crate::{proto::Error as HrpcError, request::BoxRequest, response::BoxResponse};
#[derive(Clone)]
pub struct ErrorIdentifierToStatusLayer<ToStatus> {
to_status: ToStatus,
}
impl<ToStatus> ErrorIdentifierToStatusLayer<ToStatus>
where
ToStatus: Fn(&str) -> Option<StatusCode>,
{
pub fn new(to_status: ToStatus) -> Self {
Self { to_status }
}
}
impl<ToStatus, S> Layer<S> for ErrorIdentifierToStatusLayer<ToStatus>
where
ToStatus: Clone,
{
type Service = ErrorIdentifierToStatus<ToStatus, S>;
fn layer(&self, inner: S) -> Self::Service {
ErrorIdentifierToStatus::new(self.to_status.clone(), inner)
}
}
#[derive(Clone)]
pub struct ErrorIdentifierToStatus<ToStatus, S> {
inner: S,
to_status: ToStatus,
}
impl<ToStatus, S> ErrorIdentifierToStatus<ToStatus, S> {
pub fn new(to_status: ToStatus, inner: S) -> Self {
Self { inner, to_status }
}
}
impl<ToStatus, S> Service<BoxRequest> for ErrorIdentifierToStatus<ToStatus, S>
where
S: Service<BoxRequest, Response = BoxResponse>,
ToStatus: Fn(&str) -> Option<StatusCode> + Clone,
{
type Response = BoxResponse;
type Error = S::Error;
type Future = ErrorIdentifierToStatusFuture<ToStatus, S::Future>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Service::poll_ready(&mut self.inner, cx)
}
fn call(&mut self, req: BoxRequest) -> Self::Future {
ErrorIdentifierToStatusFuture {
resp_fut: Service::call(&mut self.inner, req),
to_status: self.to_status.clone(),
}
}
}
pin_project! {
pub struct ErrorIdentifierToStatusFuture<ToStatus, Fut> {
#[pin]
resp_fut: Fut,
to_status: ToStatus,
}
}
impl<ToStatus, Fut, Err> Future for ErrorIdentifierToStatusFuture<ToStatus, Fut>
where
Fut: Future<Output = Result<BoxResponse, Err>>,
ToStatus: Fn(&str) -> Option<StatusCode>,
{
type Output = Result<BoxResponse, Err>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.project();
this.resp_fut.poll_unpin(cx).map_ok(|mut resp| {
if let Some(status) = resp
.extensions()
.get::<HrpcError>()
.and_then(|err| (this.to_status)(&err.identifier))
{
resp.extensions_mut().insert(status);
}
resp
})
}
}