fnct

Simple caching library for Rust that supports cache invalidation via tags

Example

```rust use std::time::Duration;

use fnct::{backend::AsyncRedisBackend, format::PostcardFormatter, keyfn, AsyncCache}; use redis::{aio::MultiplexedConnection, Client};

struct Application { cache: AsyncCache, PostcardFormatter>, }

keyfn!(mycachekey(a: i32, b: i32)); impl Application { async fn test(&self, a: i32, b: i32) -> i32 { self.cache .cached(mycachekey(a, b), &["sum"], None, || async { // expensive computation a + b }) .await .unwrap() } }

[tokio::main]

async fn main() { let Ok(redisserver) = std::env::var("REDISSERVER") else { return; }; let client = Client::open(redisserver).unwrap(); let conn = client.getmultiplexedasyncconnection().await.unwrap(); let app = Application { cache: AsyncCache::new( AsyncRedisBackend::new(conn, "myapplication".toowned()), PostcardFormatter, Duration::fromsecs(600), ), }; asserteq!(app.test(1, 2).await, 3); // run expensive computation and fill cache asserteq!(app.test(1, 2).await, 3); // load result from cache app.cache.popkey(mycachekey(1, 2)).await.unwrap(); // invalidate cache by key app.cache.pop_tag("sum").await.unwrap(); // invalidate cache by tag } ```