duckdb_server/
cache.rs

1use anyhow::Result;
2use serde_json::to_value;
3use tokio::sync::Mutex;
4
5use crate::interfaces::Command;
6
7#[must_use]
8pub fn get_key(sql: &str, command: &Command) -> String {
9    use sha2::{Digest, Sha256};
10    let mut hasher = Sha256::new();
11    hasher.update(sql);
12    format!(
13        "{:x}.{}",
14        hasher.finalize(),
15        to_value(command).unwrap().as_str().unwrap()
16    )
17}
18
19pub async fn retrieve<F, Fut>(
20    cache: &Mutex<lru::LruCache<String, Vec<u8>>>,
21    sql: &str,
22    command: &Command,
23    persist: bool,
24    f: F,
25) -> Result<Vec<u8>>
26where
27    F: FnOnce() -> Fut,
28    Fut: std::future::Future<Output = Result<Vec<u8>>>,
29{
30    let key = get_key(sql, command);
31
32    if let Some(cached) = cache.lock().await.get(&key) {
33        tracing::debug!("Cache hit {}!", key);
34        return Ok(cached.clone());
35    }
36
37    let result = f().await?;
38
39    if persist {
40        cache.lock().await.put(key, result.clone());
41    }
42
43    Ok(result)
44}
duckdb_server/cache.rs

duckdb_server/
cache.rs
