SQLite-based on-disk cache for Rust.

Related tags

Database sqlite-cache
Overview

sqlite-cache

crates.io

SQLite-based on-disk cache for Rust.

Usage

let cache = Cache::new(
    CacheConfig::default(),
    rusqlite::Connection::open_in_memory().unwrap(),
).unwrap();
let topic = cache.topic("test-topic").unwrap();
assert!(topic.get("hello").unwrap().is_none());
topic.set("hello", b"world", Duration::from_secs(60))
assert!(&topic.get("hello").unwrap().unwrap().data[..] == b"world");

Locked updates

This library supports locked updates to prevent the thundering herd problem on cache misses. The get_for_update API acquires a per-key lock and returns a KeyUpdater; subsequent get_for_update calls on the same key will block until the previous KeyUpdater is dropped.

let (updater, current_value) = topic.get_for_update("hello").await.unwrap();
let new_value = expensive_computation(current_value).await;
updater.write(new_value, Duration::from_secs(60)).unwrap();

Benchmark

These results are from running benches/cache_benchmark.rs on an Apple M1 processor.

  • mt(4): Per-thread operation latency when running the same task on 4 threads.
lookup - cache size 10000
                        time:   [1.5978 us 1.6051 us 1.6130 us]
lookup mt(4) - cache size 10000
                        time:   [9.7801 us 9.8464 us 9.9329 us]
insert - cache size 10000
                        time:   [4.6316 us 4.6785 us 4.7169 us]
insert mt(4) - cache size 10000
                        time:   [21.195 us 21.420 us 21.614 us]
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Comments
  • Specifying Duration::MAX as TTL leads to addition with overflow panic

    Specifying Duration::MAX as TTL leads to addition with overflow panic

    When attempting to set an entry with the maximum possible TTL, sqlite-cache will panic:

    topic.set("key", value, std::time::Duration::MAX);

    I can work around this by using an arbitrary value like 300 days worth. I think the panic should at least be an Err variant so that the program doesn't terminate in surprising situations, such as when setting a TTL based on a max-age cache header returned from some external source.

    opened by wez 3
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