Hands-On Microservices with Rust

Handler

The handler performs the same logic as the original example, but it is completely rewritten with Rust and the lambda_runtime crate. Look at the implementation of the handler function:

fn handler(event: Request, _: Context) -> Result<Response, HandlerError> {     let region = Region::default();     let client = DynamoDbClient::new(region);     let username = event         .request_context         .authorizer         .claims         .get("cognito:username")         .unwrap()         .to_owned();     debug!("USERNAME: {}", username);     let ride_id = Uuid::new_v4().to_string();     let request: RequestBody = serde_json::from_str(&event.body).unwrap();     let unicorn = find_unicorn(&request.pickup_location);     record_ride(&client, &ride_id, &username, &unicorn).unwrap();     let body = ResponseBody { ride_id: ride_id.clone(), ...