Hands-On Microservices with Rust

Developing a microservice

We need the following types in our code:

use serde_derive::{Serialize, Deserialize};use lambda_runtime::{lambda, Context, error::HandlerError};use rand::Rng;use rand::distributions::{Bernoulli, Normal, Uniform};use std::error::Error;use std::ops::Range;

It make sense to look at imports from the lambda_runtime crate. The lambda macro is used to export a handler from a binary, which will be used by the AWS Lambda runtime. Context is a required parameter of a handler, and we also have   imported HandlerError to use in the returning Result value of a handler.

Then we can write a main function that initializes simple_logger and wraps rng_handler, which we will implement in the following code, to export the handler of ...