Hands-On Microservices with Rust

Data manipulation functions

Our example needs three functions. The first function, add_session, adds an association between the token and user ID:

fn add_session(conn: &Connection, token: &str, uid: &str) -> Result<(), RedisError> {    conn.hset(SESSIONS, token, uid)}

This function only calls the hset method of a Connection and sets the uid value by the token key in the SESSIONS map. It returns RedisError if something is wrong with a set operation.

The next function, remove_session, is also pretty simple and calls the hdel method of Connection:

fn remove_session(conn: &Connection, token: &str) -> Result<(), RedisError> {    conn.hdel(SESSIONS, token)}

This function deletes a record with the token key from the SESSIONS map.

The last function,