Hands-On Microservices with Rust

Setting a value message

The first message type we add is SetValue, which provides a pair of key and new value for caching. The struct has two fields—path, which is used as a key, and content, which holds a value:

struct SetValue {    pub path: String,    pub content: Vec<u8>,}

Let's implement a Message trait for the SetValue struct with an empty unit type if the value is set, and return RedisError if there are issues with a database connection:

impl Message for SetValue {    type Result = Result<(), RedisError>;}

CacheActor has support for receiving SetValue messages. Let's implement this with the Handler trait:

impl Handler<SetValue> for CacheActor {    type Result = Result<(), RedisError>; fn handle(&mut self, msg: SetValue, _: &mut Self::Context) ...