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use std::error::Error;
use std::panic::Location;
use std::sync::Arc;
pub struct Located<E>(pub E);
#[derive(Debug)]
pub struct LocatedError<'a, E>
where
E: Error + ?Sized + Send + Sync,
{
source: Arc<E>,
location: Box<Location<'a>>,
}
impl<'a, E> std::fmt::Display for LocatedError<'a, E>
where
E: Error + ?Sized + Send + Sync,
{
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}, {}", self.source, self.location)
}
}
impl<'a, E> Error for LocatedError<'a, E>
where
E: Error + ?Sized + Send + Sync + 'static,
{
fn source(&self) -> Option<&(dyn Error + 'static)> {
Some(&self.source)
}
}
impl<'a, E> Clone for LocatedError<'a, E>
where
E: Error + ?Sized + Send + Sync,
{
fn clone(&self) -> Self {
LocatedError {
source: self.source.clone(),
location: self.location.clone(),
}
}
}
#[allow(clippy::from_over_into)]
impl<'a, E> Into<LocatedError<'a, E>> for Located<E>
where
E: Error + Send + Sync,
Arc<E>: Clone,
{
#[track_caller]
fn into(self) -> LocatedError<'a, E> {
let e = LocatedError {
source: Arc::new(self.0),
location: Box::new(*std::panic::Location::caller()),
};
log::debug!("{e}");
e
}
}
#[allow(clippy::from_over_into)]
impl<'a> Into<LocatedError<'a, dyn std::error::Error + Send + Sync>> for Arc<dyn std::error::Error + Send + Sync> {
#[track_caller]
fn into(self) -> LocatedError<'a, dyn std::error::Error + Send + Sync> {
LocatedError {
source: self,
location: Box::new(*std::panic::Location::caller()),
}
}
}
#[cfg(test)]
mod tests {
use std::panic::Location;
use super::LocatedError;
use crate::located_error::Located;
#[derive(thiserror::Error, Debug)]
enum TestError {
#[error("Test")]
Test,
}
#[track_caller]
fn get_caller_location() -> Location<'static> {
*Location::caller()
}
#[test]
fn error_should_include_location() {
let e = TestError::Test;
let b: LocatedError<TestError> = Located(e).into();
let l = get_caller_location();
assert_eq!(b.location.file(), l.file());
}
}