Add better error logging

Author: thecodingwizard

Dockerfile

@@ -10,5 +10,7 @@ RUN dnf install -y time tar
 
 COPY target/lambda/online-judge-rust/bootstrap ${LAMBDA_RUNTIME_DIR}/bootstrap
 
+ENV RUST_BACKTRACE=1
+
 # This is passed in as argv[1] to /var/runtime/bootstrap. The value shouldn't matter.
 CMD [ "_handler" ]

src/error.rs

@@ -2,17 +2,18 @@
 //! Taken from https://github.com/tokio-rs/axum/blob/main/examples/anyhow-error-response/src/main.rs
 
 use axum::{http::StatusCode, response::{IntoResponse, Response}};
+use lambda_http::tracing::error;
 
 // Make our own error that wraps `anyhow::Error`.
 pub struct AppError(anyhow::Error);
 
 // Tell axum how to convert `AppError` into a response.
 impl IntoResponse for AppError {
     fn into_response(self) -> Response {
-        println!("Returning Internal Server Error: {}", self.0);
+        error!("Returning Internal Server Error: {:?}", self.0);
         (
             StatusCode::INTERNAL_SERVER_ERROR,
-            format!("Internal Server Error: {}", self.0),
+            format!("Internal Server Error: {:?}", self.0),
         )
             .into_response()
     }