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use std::{any::Any, panic::AssertUnwindSafe};
use futures_util::FutureExt;
use http::StatusCode;
use crate::{Endpoint, IntoResponse, Middleware, Request, Response, Result};
pub trait PanicHandler: Clone + Sync + Send + 'static {
type Response: IntoResponse;
fn get_response(&self, err: Box<dyn Any + Send + 'static>) -> Self::Response;
}
impl PanicHandler for () {
type Response = (StatusCode, &'static str);
fn get_response(&self, _err: Box<dyn Any + Send + 'static>) -> Self::Response {
(StatusCode::INTERNAL_SERVER_ERROR, "internal server error")
}
}
impl<F, R> PanicHandler for F
where
F: Fn(Box<dyn Any + Send + 'static>) -> R + Send + Sync + Clone + 'static,
R: IntoResponse,
{
type Response = R;
fn get_response(&self, err: Box<dyn Any + Send + 'static>) -> Self::Response {
(self)(err)
}
}
pub struct CatchPanic<H> {
panic_handler: H,
}
impl CatchPanic<()> {
#[inline]
pub fn new() -> Self {
CatchPanic { panic_handler: () }
}
}
impl Default for CatchPanic<()> {
#[inline]
fn default() -> Self {
Self::new()
}
}
impl<H> CatchPanic<H> {
#[inline]
pub fn with_handler<T: PanicHandler>(self, handler: T) -> CatchPanic<T> {
CatchPanic {
panic_handler: handler,
}
}
}
impl<E: Endpoint, H: PanicHandler> Middleware<E> for CatchPanic<H> {
type Output = CatchPanicEndpoint<E, H>;
fn transform(&self, ep: E) -> Self::Output {
CatchPanicEndpoint {
inner: ep,
panic_handler: self.panic_handler.clone(),
}
}
}
pub struct CatchPanicEndpoint<E, H> {
inner: E,
panic_handler: H,
}
#[async_trait::async_trait]
impl<E: Endpoint, H: PanicHandler> Endpoint for CatchPanicEndpoint<E, H> {
type Output = Response;
async fn call(&self, req: Request) -> Result<Self::Output> {
match AssertUnwindSafe(self.inner.call(req)).catch_unwind().await {
Ok(resp) => resp.map(IntoResponse::into_response),
Err(err) => Ok(self.panic_handler.get_response(err).into_response()),
}
}
}