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//! Typed cache wrapper that dispatches to either moka (in-process) or a custom
//! [`CacheStore`] backend (e.g., Redis).
//!
//! [`TypedCache`] presents the same interface regardless of the backing store.
//! Keys are serialised via [`Display`]; values are serialised with `serde_json`
//! only on the custom-store path — the moka path has zero extra overhead.
use std::borrow::Borrow;
use std::fmt::Display;
use std::marker::PhantomData;
use std::sync::Arc;
use std::time::Duration;
use crate::cache::Cache;
use serde::{Serialize, de::DeserializeOwned};
pub use wacore::store::cache::CacheStore;
// ── Internal storage variant ──────────────────────────────────────────────────
enum Inner<K, V> {
Moka(Cache<K, V>),
Custom {
store: Arc<dyn CacheStore>,
namespace: &'static str,
ttl: Option<Duration>,
_marker: PhantomData<fn(K, V)>,
},
}
// ── TypedCache ─────────────────────────────────────────────────────────────────
/// A cache over `K → V` backed by either moka or any [`CacheStore`].
///
/// The moka path has **zero extra overhead** — values are stored in-process
/// without any serialisation. The custom-store path serialises values with
/// `serde_json` and keys via [`Display`].
///
/// Methods mirror moka's API so call sites need no changes.
pub struct TypedCache<K, V> {
inner: Inner<K, V>,
}
impl<K, V> TypedCache<K, V>
where
K: std::hash::Hash + Eq + Clone + Send + Sync + 'static,
V: Clone + Send + Sync + 'static,
{
/// Wrap an existing cache (zero overhead vs. using the cache directly).
pub fn from_moka(cache: Cache<K, V>) -> Self {
Self {
inner: Inner::Moka(cache),
}
}
}
impl<K, V> TypedCache<K, V>
where
K: std::hash::Hash + Eq + Clone + Display + Send + Sync + 'static,
V: Clone + Serialize + DeserializeOwned + Send + Sync + 'static,
{
/// Create a cache backed by a custom store.
///
/// - `namespace` — unique string for this cache (e.g., `"group"`)
/// - `ttl` — forwarded to [`CacheStore::set`]; `None` means no expiry
pub fn from_store(
store: Arc<dyn CacheStore>,
namespace: &'static str,
ttl: Option<Duration>,
) -> Self {
Self {
inner: Inner::Custom {
store,
namespace,
ttl,
_marker: PhantomData,
},
}
}
/// Look up a value.
///
/// Accepts borrowed keys (`&str` for `String`, `&Jid` for `Jid`, etc.)
/// following the same pattern as [`std::collections::HashMap::get`].
///
/// Cache misses and deserialisation failures both return `None`; the
/// caller re-fetches from the authoritative source.
pub async fn get<Q>(&self, key: &Q) -> Option<V>
where
K: Borrow<Q>,
Q: std::hash::Hash + Eq + Display + ?Sized,
{
match &self.inner {
Inner::Moka(cache) => cache.get(key).await,
Inner::Custom {
store, namespace, ..
} => {
let key_str = key.to_string();
match store.get(namespace, &key_str).await {
Ok(Some(bytes)) => serde_json::from_slice(&bytes)
.inspect_err(|e| {
log::warn!(
"TypedCache[{namespace}]: deserialise failed for {key_str}: {e}"
);
})
.ok(),
Ok(None) => None,
Err(e) => {
log::warn!("TypedCache[{namespace}]: get({key_str}) error: {e}");
None
}
}
}
}
}
/// Insert or update a value (takes ownership of key and value).
pub async fn insert(&self, key: K, value: V) {
match &self.inner {
Inner::Moka(cache) => cache.insert(key, value).await,
Inner::Custom {
store,
namespace,
ttl,
..
} => {
let key_str = key.to_string();
match serde_json::to_vec(&value) {
Ok(bytes) => {
if let Err(e) = store.set(namespace, &key_str, &bytes, *ttl).await {
log::warn!("TypedCache[{namespace}]: set({key_str}) error: {e}");
}
}
Err(e) => {
log::warn!("TypedCache[{namespace}]: serialise failed for {key_str}: {e}");
}
}
}
}
}
/// Remove a single key.
///
/// Accepts borrowed keys following the same pattern as `get`.
pub async fn invalidate<Q>(&self, key: &Q)
where
K: Borrow<Q>,
Q: std::hash::Hash + Eq + Display + ?Sized,
{
match &self.inner {
Inner::Moka(cache) => cache.invalidate(key).await,
Inner::Custom {
store, namespace, ..
} => {
let key_str = key.to_string();
if let Err(e) = store.delete(namespace, &key_str).await {
log::warn!("TypedCache[{namespace}]: delete({key_str}) error: {e}");
}
}
}
}
/// Remove all entries.
///
/// For the moka backend this is synchronous (matching moka's API).
/// For the custom backend this spawns a fire-and-forget task via
/// [`tokio::runtime::Handle::try_current`] (requires `tokio-runtime`
/// feature) to avoid panicking if called outside a Tokio runtime.
/// Without `tokio-runtime`, the clear is skipped with a warning.
pub fn invalidate_all(&self) {
match &self.inner {
Inner::Moka(cache) => cache.invalidate_all(),
Inner::Custom {
store, namespace, ..
} => {
let _store = store.clone();
let _ns = *namespace;
#[cfg(all(not(target_arch = "wasm32"), feature = "tokio-runtime"))]
match tokio::runtime::Handle::try_current() {
Ok(handle) => {
handle.spawn(async move {
if let Err(e) = _store.clear(_ns).await {
log::warn!("TypedCache[{_ns}]: clear() error: {e}");
}
});
}
Err(_) => {
log::warn!("TypedCache[{_ns}]: clear() skipped: no runtime");
}
}
#[cfg(all(not(target_arch = "wasm32"), not(feature = "tokio-runtime")))]
log::warn!("TypedCache[{_ns}]: clear() skipped: tokio-runtime feature not enabled");
}
}
}
/// Remove all entries, awaiting completion for custom backends.
pub async fn clear(&self) {
match &self.inner {
Inner::Moka(cache) => cache.invalidate_all(),
Inner::Custom {
store, namespace, ..
} => {
if let Err(e) = store.clear(namespace).await {
log::warn!("TypedCache[{namespace}]: clear() error: {e}");
}
}
}
}
/// Run any pending internal housekeeping tasks (moka only).
///
/// For the moka backend this ensures all writes have been applied before
/// calling [`entry_count`](Self::entry_count), which can otherwise lag.
/// For custom backends this is a no-op.
pub async fn run_pending_tasks(&self) {
if let Inner::Moka(cache) = &self.inner {
cache.run_pending_tasks().await;
}
}
/// Approximate entry count (sync). Returns `0` for custom backends.
///
/// For diagnostics that need custom backend counts, use
/// [`entry_count_async`](Self::entry_count_async) instead.
pub fn entry_count(&self) -> u64 {
match &self.inner {
Inner::Moka(cache) => cache.entry_count(),
Inner::Custom { .. } => 0,
}
}
/// Approximate entry count, delegating to the custom backend if available.
pub async fn entry_count_async(&self) -> u64 {
match &self.inner {
Inner::Moka(cache) => cache.entry_count(),
Inner::Custom {
store, namespace, ..
} => store.entry_count(namespace).await.unwrap_or(0),
}
}
}