feat: automatic conversion from anyhow::Error and access to aggregate errors

crates/mad/src/lib.rs

@@ -30,11 +30,23 @@ pub enum MadError {
     CloseNotDefined,
 }
 
+impl From<anyhow::Error> for MadError {
+    fn from(value: anyhow::Error) -> Self {
+        Self::Inner(value)
+    }
+}
+
 #[derive(Debug)]
 pub struct AggregateError {
     errors: Vec<MadError>,
 }
 
+impl AggregateError {
+    pub fn get_errors(&self) -> &[MadError] {
+        &self.errors
+    }
+}
+
 impl Display for AggregateError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.write_str("MadError::AggregateError: (")?;

crates/mad/tests/mod.rs

@@ -1,7 +1,7 @@
 use std::sync::Arc;
 
 use async_trait::async_trait;
-use notmad::{Component, Mad};
+use notmad::{Component, Mad, MadError};
 use rand::Rng;
 use tokio::sync::Mutex;
 use tokio_util::sync::CancellationToken;
@@ -137,3 +137,20 @@ async fn test_can_shutdown_gracefully() -> anyhow::Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn test_can_easily_transform_error() -> anyhow::Result<()> {
+    fn fallible() -> anyhow::Result<()> {
+        Ok(())
+    }
+
+    fn inner() -> Result<(), MadError> {
+        fallible()?;
+
+        Ok(())
+    }
+
+    inner()?;
+
+    Ok(())
+}