Hands-On Microservices with Rust

Get value message

The GetValue struct represents a message to extract a value from Redis by key (or path, in our case). It contains only one field with a path value:

struct GetValue {    pub path: String,}

We also have to implement the Message trait to it, but we want it to return an optional Vec<u8> value if Redis contains a value for the provided key:

impl Message for GetValue {    type Result = Result<Option<Vec<u8>>, RedisError>;}

CacheActor also implements a Handler trait for the GetValue message type, and uses the GET command of Redis storage by calling the get method of Client to extract a value from storage:

impl Handler<GetValue> for CacheActor {    type Result = Result<Option<Vec<u8>>, RedisError>; fn handle(&mut self, msg: GetValue, ...