Fix rust template

Author: gvdongen

templates/rust/Cargo.lock

@@ -8,3 +8,4 @@ restate-sdk = "0.3"
 tokio = { version = "1", features = ["full"] }
 tracing-subscriber = "0.3"
 rand = "0.8.5"
+anyhow = "1.0.86"

templates/rust/Cargo.toml

@@ -15,15 +15,9 @@ impl Greeter for GreeterImpl {
     async fn greet(&self, mut ctx: Context<'_>, name: String) -> HandlerResult<String> {
         // Durably execute a set of steps; resilient against failures
         let greeting_id = ctx.rand_uuid().to_string();
-        ctx.run(|| async {
-            send_notification(&greeting_id, &name);
-            Ok(())
-        }).await?;
+        ctx.run(|| send_notification(&greeting_id, &name)).await?;
         ctx.sleep(Duration::from_millis(1000)).await?;
-        ctx.run(|| async {
-            send_reminder(&greeting_id);
-            Ok(())
-        }).await?;
+        ctx.run(|| send_reminder(&greeting_id)).await?;
 
         // Respond to caller
         Ok(format!("Greetings {name}"))

templates/rust/src/main.rs

@@ -1,17 +1,21 @@
 use rand::random;
+use anyhow::{anyhow, Result};
+use restate_sdk::errors::HandlerError;
 
-pub fn send_notification(greeting_id: &str, name: &str) {
+pub async fn send_notification(greeting_id: &str, name: &str) -> Result<(), HandlerError> {
     if random::<f32>() < 0.5 {
         println!("👻 Failed to send notification: {} - {}", greeting_id, name);
-        panic!("Failed to send notification: {} - {}", greeting_id, name);
+        return Err(HandlerError::from(anyhow!("Failed to send notification: {} - {}", greeting_id, name)));
     }
     println!("Notification sent: {} - {}", greeting_id, name);
+    Ok(())
 }
 
-pub fn send_reminder(greeting_id: &str) {
+pub async fn send_reminder(greeting_id: &str)-> Result<(), HandlerError> {
     if random::<f32>() < 0.5 {
         println!("👻 Failed to send reminder:  - {}", greeting_id);
-        panic!("Failed to send reminder:  - {}", greeting_id);
+        return Err(HandlerError::from(anyhow!("Failed to send reminder: {}", greeting_id)));
     }
     println!("Reminder sent: {}", greeting_id);
+    Ok(())
 }