Module 31: Redis Caching

Practice Tasks

Complete these tasks to reinforce what you learned in this module.

Task 1: SET and GET

Connect to Redis at redis://127.0.0.1/ (or from env REDIS_URL). Set a key task1_key to the value task1_value, then get it and print the value. Use AsyncCommands and #[tokio::main]. Handle errors with ?.

Expected Output:

With Redis running, program prints `task1_value`.

Hint: Get an async connection from the client, then use the AsyncCommands trait: one method to set a key-value pair, one to get the value. Both are async; use ? and #[tokio::main].

Starter Code:

task.rs

// Task 1: SET and GET. See tasks/TASKS.md.

fn main() {
    todo!("Connect to Redis, set task1_key, get and print");
}

Task 2: SET with TTL

Set a key task2_key to task2_value with an expiry of 10 seconds using .set_ex. Then get the key and print it. (Optional: sleep 11 seconds and get again to see None/error.)

Expected Output:

Immediately after set, get returns `task2_value`.

Hint: There is a variant of set that accepts an expiry in seconds. Use it to set the key with a TTL, then get the value as before.

Starter Code:

task.rs

// Task 2: SET with TTL. See tasks/TASKS.md.

fn main() {
    todo!("set_ex task2_key, get and print");
}