Building the update client

Our update function takes the following signature:

// nanoservices/user-session-cache/cache-client/src/lib.rs
#[derive(Debug)]
pub enum UserSessionStatus {
    Ok(i32),
    Refresh
}
pub async fn update(address: &str, user_id: &str)
    -> Result<UserSessionStatus, NanoServiceError> {
    let mut con = get_connnection(address).await?;
    . . .
}

The command is defined with the code below:

// nanoservices/user-session-cache/cache-client/src/lib.rs
let result = con
    .req_packed_command(
        &redis::cmd("update.set")
            .arg(user_id)
            .clone(),
    )
    .await.map_err(|e|{
        NanoServiceError::new(
            e.to_string(),
            NanoServiceErrorStatus::Unknown
        )
    })?;

With the result, we can inspect the string, returning a status depending on the response string with the code below:

// nanoservices/user-session-cache/cache-client/src/lib.rs
let result_string = unpack_result_string...