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+//! Per-mint cryptographic key and metadata cache
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+//!
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+//! Provides on-demand fetching and caching of mint metadata (info, keysets, and keys)
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+//! with atomic in-memory cache updates and deferred database persistence.
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+//!
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+//! # Architecture
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+//!
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+//! - **Pull-based loading**: Keys fetched on-demand from mint HTTP API
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+//! - **Atomic cache**: Single `MintMetadata` snapshot updated via `ArcSwap`
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+//! - **Deferred persistence**: Database writes happen asynchronously after cache update
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+//! - **Multi-database support**: Tracks sync status per storage instance via pointer identity
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+//!
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+//! # Usage
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+//!
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+//! ```ignore
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+//! // Create manager (cheap, no I/O)
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+//! let manager = Arc::new(MintMetadataCache::new(mint_url));
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+//!
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+//! // Load metadata (returns cached if available, fetches if not)
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+//! let metadata = manager.load(&storage, &client).await?;
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+//! let keys = metadata.keys.get(&keyset_id).ok_or(Error::UnknownKeySet)?;
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+//!
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+//! // Force refresh from mint
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+//! let fresh = manager.load_from_mint(&storage, &client).await?;
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+//! ```
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+
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+use std::collections::HashMap;
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+use std::fmt::Debug;
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+use std::sync::Arc;
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+use std::time::Instant;
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+
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+use arc_swap::ArcSwap;
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+use cdk_common::database::{self, WalletDatabase};
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+use cdk_common::mint_url::MintUrl;
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+use cdk_common::nuts::{KeySetInfo, Keys};
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+use cdk_common::parking_lot::RwLock;
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+use cdk_common::task::spawn;
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+use cdk_common::{KeySet, MintInfo};
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+
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+use crate::nuts::Id;
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+#[cfg(feature = "auth")]
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+use crate::wallet::AuthMintConnector;
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+use crate::wallet::MintConnector;
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+use crate::Error;
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+
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+/// Metadata freshness and versioning information
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+///
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+/// Tracks when data was last fetched and which version is currently cached.
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+/// Used to determine if cache is ready and if database sync is needed.
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+#[derive(Clone, Debug)]
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+struct FreshnessStatus {
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+ /// Whether this data has been successfully fetched at least once
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+ is_populated: bool,
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+
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+ /// When this data was last fetched from the mint
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+ last_fetched_at: Instant,
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+
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+ /// Monotonically increasing version number (for database sync tracking)
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+ version: usize,
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+}
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+
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+impl Default for FreshnessStatus {
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+ fn default() -> Self {
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+ Self {
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+ is_populated: false,
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+ last_fetched_at: Instant::now(),
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+ version: 0,
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+ }
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+ }
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+}
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+
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+/// Complete metadata snapshot for a single mint
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+///
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+/// Contains all cryptographic keys, keyset metadata, and mint information
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+/// fetched from a mint server. This struct is atomically swapped as a whole
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+/// to ensure readers always see a consistent view.
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+///
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+/// Cloning is cheap due to `Arc` wrapping of large data structures.
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+#[derive(Clone, Debug, Default)]
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+pub struct MintMetadata {
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+ /// Mint server information (name, description, supported features, etc.)
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+ pub mint_info: MintInfo,
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+
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+ /// All keysets indexed by their ID (includes both active and inactive)
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+ pub keysets: HashMap<Id, Arc<KeySetInfo>>,
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+
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+ /// Cryptographic keys for each keyset, indexed by keyset ID
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+ pub keys: HashMap<Id, Arc<Keys>>,
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+
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+ /// Subset of keysets that are currently active (cached for convenience)
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+ pub active_keysets: Vec<Arc<KeySetInfo>>,
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+
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+ /// Freshness tracking for regular (non-auth) mint data
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+ status: FreshnessStatus,
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+
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+ /// Freshness tracking for blind auth keysets (when `auth` feature enabled)
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+ #[cfg(feature = "auth")]
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+ auth_status: FreshnessStatus,
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+}
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+
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+/// On-demand mint metadata cache with deferred database persistence
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+///
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+/// Manages a single mint's cryptographic keys and metadata. Fetches data from
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+/// the mint's HTTP API on-demand and caches it in memory. Database writes are
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+/// deferred to background tasks to avoid blocking operations.
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+///
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+/// # Thread Safety
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+///
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+/// All methods are safe to call concurrently. The cache uses `ArcSwap` for
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+/// lock-free reads and atomic updates.
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+///
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+/// # Cloning
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+///
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+/// Cheap to clone - all data is behind `Arc`. Clones share the same cache.
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+#[derive(Clone)]
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+pub struct MintMetadataCache {
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+ /// The mint server URL this cache manages
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+ mint_url: MintUrl,
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+
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+ /// Atomically-updated metadata snapshot (lock-free reads)
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+ metadata: Arc<ArcSwap<MintMetadata>>,
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+
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+ /// Tracks which database instances have been synced to which cache version.
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+ /// Key: pointer identity of storage Arc, Value: last synced cache version
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+ db_sync_versions: Arc<RwLock<HashMap<usize, usize>>>,
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+}
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+
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+impl std::fmt::Debug for MintMetadataCache {
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+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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+ f.debug_struct("MintMetadataCache")
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+ .field("mint_url", &self.mint_url)
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+ .field("is_populated", &self.metadata.load().status.is_populated)
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+ .field("keyset_count", &self.metadata.load().keysets.len())
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+ .finish()
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+ }
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+}
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+
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+impl MintMetadataCache {
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+ /// Compute a unique identifier for an Arc pointer
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+ ///
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+ /// Used to track which storage instances have been synced. We use pointer
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+ /// identity rather than a counter because wallets may use multiple storage
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+ /// backends simultaneously (e.g., different databases for different mints).
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+ fn arc_pointer_id<T>(arc: &Arc<T>) -> usize
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+ where
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+ T: ?Sized,
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+ {
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+ Arc::as_ptr(arc) as *const () as usize
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+ }
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+
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+ /// Create a new metadata cache for the given mint
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+ ///
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+ /// This is a cheap operation that only allocates memory. No network or
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+ /// database I/O occurs until `load()` or `load_from_mint()` is called.
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+ ///
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+ /// # Example
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+ ///
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+ /// ```ignore
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+ /// let cache = MintMetadataCache::new(mint_url);
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+ /// // No data loaded yet - call load() to fetch
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+ /// ```
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+ pub fn new(mint_url: MintUrl) -> Self {
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+ Self {
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+ mint_url,
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+ metadata: Arc::new(ArcSwap::default()),
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+ db_sync_versions: Arc::new(Default::default()),
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+ }
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+ }
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+
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+ /// Load metadata from mint server and update cache
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+ ///
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+ /// Always performs an HTTP fetch from the mint server to get fresh data.
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+ /// Updates the in-memory cache and spawns a background task to persist
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+ /// to the database.
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+ ///
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+ /// Use this when you need guaranteed fresh data from the mint.
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+ ///
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+ /// # Arguments
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+ ///
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+ /// * `storage` - Database to persist metadata to (async background write)
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+ /// * `client` - HTTP client for fetching from mint server
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+ ///
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+ /// # Returns
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+ ///
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+ /// Fresh metadata from the mint server
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+ ///
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+ /// # Example
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+ ///
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+ /// ```ignore
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+ /// // Force refresh from mint (ignores cache)
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+ /// let fresh = cache.load_from_mint(&storage, &client).await?;
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+ /// ```
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+ #[inline(always)]
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+ pub async fn load_from_mint(
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+ &self,
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+ storage: &Arc<dyn WalletDatabase<Err = database::Error> + Send + Sync>,
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+ client: &Arc<dyn MintConnector + Send + Sync>,
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+ ) -> Result<Arc<MintMetadata>, Error> {
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+ #[cfg(feature = "auth")]
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+ let metadata = self.fetch_from_http(Some(client), None).await?;
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+
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+ #[cfg(not(feature = "auth"))]
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+ let metadata = self.fetch_from_http(Some(client)).await?;
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+
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+ // Spawn background task to persist to database (non-blocking)
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+ self.spawn_database_sync(storage.clone(), metadata.clone());
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+
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+ Ok(metadata)
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+ }
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+
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+ /// Load metadata from cache or fetch if not available
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+ ///
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+ /// Returns cached metadata if available, otherwise fetches from the mint.
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+ /// If cache is stale relative to the database, spawns a background sync task.
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+ ///
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+ /// This is the primary method for normal operations - it balances freshness
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+ /// with performance by returning cached data when available.
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+ ///
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+ /// # Arguments
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+ ///
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+ /// * `storage` - Database to persist metadata to (if fetched or stale)
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+ /// * `client` - HTTP client for fetching from mint (only if cache empty)
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+ ///
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+ /// # Returns
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+ ///
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+ /// Metadata from cache if available, otherwise fresh from mint
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+ ///
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+ /// # Example
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+ ///
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+ /// ```ignore
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+ /// // Use cached data if available, fetch if not
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+ /// let metadata = cache.load(&storage, &client).await?;
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+ /// ```
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+ #[inline(always)]
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+ pub async fn load(
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+ &self,
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+ storage: &Arc<dyn WalletDatabase<Err = database::Error> + Send + Sync>,
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+ client: &Arc<dyn MintConnector + Send + Sync>,
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+ ) -> Result<Arc<MintMetadata>, Error> {
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+ let cached_metadata = self.metadata.load().clone();
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+ let storage_id = Self::arc_pointer_id(storage);
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+
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+ // Check what version of cache this database has seen
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+ let db_synced_version = self
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+ .db_sync_versions
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+ .read()
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+ .get(&storage_id)
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+ .cloned()
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+ .unwrap_or_default();
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+
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+ if cached_metadata.status.is_populated {
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+ // Cache is ready - check if database needs updating
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+ if db_synced_version != cached_metadata.status.version {
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+ // Database is stale - sync in background
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+ // We spawn rather than await to avoid blocking the caller
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+ // and to prevent deadlocks with any existing transactions
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+ self.spawn_database_sync(storage.clone(), cached_metadata.clone());
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+ }
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+ return Ok(cached_metadata);
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+ }
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+
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+ // Cache not populated - fetch from mint
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+ self.load_from_mint(storage, client).await
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+ }
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+
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+ /// Load auth keysets and keys (auth feature only)
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+ ///
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+ /// Fetches blind authentication keysets from the mint. Always performs
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+ /// an HTTP fetch to get current auth keysets.
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+ ///
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+ /// # Arguments
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+ ///
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+ /// * `storage` - Database to persist metadata to
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+ /// * `auth_client` - Auth-capable HTTP client for fetching blind auth keysets
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+ ///
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+ /// # Returns
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+ ///
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+ /// Metadata containing auth keysets and keys
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+ #[cfg(feature = "auth")]
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+ pub async fn load_auth(
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+ &self,
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+ storage: &Arc<dyn WalletDatabase<Err = database::Error> + Send + Sync>,
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+ auth_client: &Arc<dyn AuthMintConnector + Send + Sync>,
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+ ) -> Result<Arc<MintMetadata>, Error> {
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+ let cached_metadata = self.metadata.load().clone();
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+ let storage_id = Self::arc_pointer_id(storage);
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+
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+ let db_synced_version = self
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+ .db_sync_versions
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+ .read()
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+ .get(&storage_id)
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+ .cloned()
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+ .unwrap_or_default();
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+
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+ // Check if auth data is populated in cache
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+ if cached_metadata.auth_status.is_populated {
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+ if db_synced_version != cached_metadata.status.version {
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+ // Database needs updating - spawn background sync
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+ self.spawn_database_sync(storage.clone(), cached_metadata.clone());
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+ }
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+ return Ok(cached_metadata);
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+ }
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+
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+ // Auth data not in cache - fetch from mint
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+ let metadata = self.fetch_from_http(None, Some(auth_client)).await?;
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+
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+ // Spawn background task to persist
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+ self.spawn_database_sync(storage.clone(), metadata.clone());
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+
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+ Ok(metadata)
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+ }
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+
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+ /// Spawn a background task to sync metadata to database
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+ ///
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+ /// This is non-blocking and happens asynchronously. The task will:
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+ /// 1. Check if this sync is still needed (version may be superseded)
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+ /// 2. Save mint info, keysets, and keys to the database
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+ /// 3. Update the sync tracking to record this storage has been updated
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+ fn spawn_database_sync(
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+ &self,
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+ storage: Arc<dyn WalletDatabase<Err = database::Error> + Send + Sync>,
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+ metadata: Arc<MintMetadata>,
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+ ) {
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+ let mint_url = self.mint_url.clone();
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+ let db_sync_versions = self.db_sync_versions.clone();
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+
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+ spawn(async move {
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+ Self::persist_to_database(mint_url, storage, metadata, db_sync_versions).await
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+ });
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+ }
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+
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+ /// Persist metadata to database (called from background task)
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+ ///
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+ /// Saves mint info, keysets, and keys to the database. Checks version
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+ /// before writing to avoid redundant work if a newer version has already
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+ /// been persisted.
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+ ///
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+ /// # Arguments
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+ ///
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+ /// * `mint_url` - Mint URL for database keys
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+ /// * `storage` - Database to write to
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+ /// * `metadata` - Metadata to persist
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+ /// * `db_sync_versions` - Shared version tracker
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+ async fn persist_to_database(
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+ mint_url: MintUrl,
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+ storage: Arc<dyn WalletDatabase<Err = database::Error> + Send + Sync>,
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+ metadata: Arc<MintMetadata>,
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+ db_sync_versions: Arc<RwLock<HashMap<usize, usize>>>,
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+ ) {
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+ let storage_id = Self::arc_pointer_id(&storage);
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+
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+ // Check if this write is still needed
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+ {
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+ let mut versions = db_sync_versions.write();
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+
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+ let current_synced_version = versions.get(&storage_id).cloned().unwrap_or_default();
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+
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+ if metadata.status.version <= current_synced_version {
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+ // A newer version has already been persisted - skip this write
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+ return;
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+ }
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+
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+ // Mark this version as being synced
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+ versions.insert(storage_id, metadata.status.version);
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+ }
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+
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+ // Save mint info
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+ storage
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+ .add_mint(mint_url.clone(), Some(metadata.mint_info.clone()))
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+ .await
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+ .inspect_err(|e| tracing::warn!("Failed to save mint info for {}: {}", mint_url, e))
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+ .ok();
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+
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+ // Save all keysets
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+ let keysets: Vec<_> = metadata.keysets.values().map(|ks| (**ks).clone()).collect();
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+
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+ if !keysets.is_empty() {
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+ storage
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+ .add_mint_keysets(mint_url.clone(), keysets)
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+ .await
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+ .inspect_err(|e| tracing::warn!("Failed to save keysets for {}: {}", mint_url, e))
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+ .ok();
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+ }
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+
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+ // Save keys for each keyset
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+ for (keyset_id, keys) in &metadata.keys {
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+ if let Some(keyset_info) = metadata.keysets.get(keyset_id) {
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+ let keyset = KeySet {
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+ id: *keyset_id,
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+ unit: keyset_info.unit.clone(),
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+ final_expiry: keyset_info.final_expiry,
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+ keys: (**keys).clone(),
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+ };
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+
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+ storage
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+ .add_keys(keyset)
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+ .await
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+ .inspect_err(|e| {
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+ tracing::warn!(
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+ "Failed to save keys for keyset {} at {}: {}",
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+ keyset_id,
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+ mint_url,
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+ e
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+ )
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+ })
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+ .ok();
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+ }
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+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /// Fetch fresh metadata from mint HTTP API and update cache
|
|
|
+ ///
|
|
|
+ /// Performs the following steps:
|
|
|
+ /// 1. Fetches mint info from server
|
|
|
+ /// 2. Fetches list of all keysets
|
|
|
+ /// 3. Fetches cryptographic keys for each keyset
|
|
|
+ /// 4. Verifies keyset IDs match their keys
|
|
|
+ /// 5. Atomically updates in-memory cache
|
|
|
+ ///
|
|
|
+ /// # Arguments
|
|
|
+ ///
|
|
|
+ /// * `client` - Optional regular mint client (for non-auth operations)
|
|
|
+ /// * `auth_client` - Optional auth client (for blind auth keysets)
|
|
|
+ ///
|
|
|
+ /// # Returns
|
|
|
+ ///
|
|
|
+ /// Newly fetched and cached metadata
|
|
|
+ async fn fetch_from_http(
|
|
|
+ &self,
|
|
|
+ client: Option<&Arc<dyn MintConnector + Send + Sync>>,
|
|
|
+ #[cfg(feature = "auth")] auth_client: Option<&Arc<dyn AuthMintConnector + Send + Sync>>,
|
|
|
+ ) -> Result<Arc<MintMetadata>, Error> {
|
|
|
+ tracing::debug!("Fetching mint metadata from HTTP for {}", self.mint_url);
|
|
|
+
|
|
|
+ // Start with current cache to preserve data from other sources
|
|
|
+ let mut new_metadata = (*self.metadata.load().clone()).clone();
|
|
|
+ let mut keysets_to_fetch = Vec::new();
|
|
|
+
|
|
|
+ // Fetch regular mint data
|
|
|
+ if let Some(client) = client.as_ref() {
|
|
|
+ // Get mint information
|
|
|
+ new_metadata.mint_info = client.get_mint_info().await.inspect_err(|err| {
|
|
|
+ tracing::error!("Failed to fetch mint info for {}: {}", self.mint_url, err);
|
|
|
+ })?;
|
|
|
+
|
|
|
+ // Get list of keysets
|
|
|
+ keysets_to_fetch.extend(
|
|
|
+ client
|
|
|
+ .get_mint_keysets()
|
|
|
+ .await
|
|
|
+ .inspect_err(|err| {
|
|
|
+ tracing::error!("Failed to fetch keysets for {}: {}", self.mint_url, err);
|
|
|
+ })?
|
|
|
+ .keysets,
|
|
|
+ );
|
|
|
+ }
|
|
|
+
|
|
|
+ // Fetch auth keysets if auth client provided
|
|
|
+ #[cfg(feature = "auth")]
|
|
|
+ if let Some(auth_client) = auth_client.as_ref() {
|
|
|
+ keysets_to_fetch.extend(auth_client.get_mint_blind_auth_keysets().await?.keysets);
|
|
|
+ }
|
|
|
+
|
|
|
+ tracing::debug!(
|
|
|
+ "Fetched {} keysets for {}",
|
|
|
+ keysets_to_fetch.len(),
|
|
|
+ self.mint_url
|
|
|
+ );
|
|
|
+
|
|
|
+ // Fetch keys for each keyset
|
|
|
+ for keyset_info in keysets_to_fetch {
|
|
|
+ let keyset_arc = Arc::new(keyset_info.clone());
|
|
|
+ new_metadata
|
|
|
+ .keysets
|
|
|
+ .insert(keyset_info.id, keyset_arc.clone());
|
|
|
+
|
|
|
+ // Track active keysets separately for quick access
|
|
|
+ if keyset_info.active {
|
|
|
+ new_metadata.active_keysets.push(keyset_arc);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Only fetch keys if we don't already have them cached
|
|
|
+ if let std::collections::hash_map::Entry::Vacant(e) =
|
|
|
+ new_metadata.keys.entry(keyset_info.id)
|
|
|
+ {
|
|
|
+ let keyset = if let Some(client) = client.as_ref() {
|
|
|
+ client.get_mint_keyset(keyset_info.id).await?
|
|
|
+ } else {
|
|
|
+ #[cfg(feature = "auth")]
|
|
|
+ if let Some(auth_client) = auth_client.as_ref() {
|
|
|
+ auth_client
|
|
|
+ .get_mint_blind_auth_keyset(keyset_info.id)
|
|
|
+ .await?
|
|
|
+ } else {
|
|
|
+ return Err(Error::Internal);
|
|
|
+ }
|
|
|
+
|
|
|
+ #[cfg(not(feature = "auth"))]
|
|
|
+ return Err(Error::Internal);
|
|
|
+ };
|
|
|
+
|
|
|
+ // Verify the keyset ID matches the keys
|
|
|
+ keyset.verify_id()?;
|
|
|
+
|
|
|
+ e.insert(Arc::new(keyset.keys));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Update freshness status based on what was fetched
|
|
|
+ if client.is_some() {
|
|
|
+ new_metadata.status.is_populated = true;
|
|
|
+ new_metadata.status.last_fetched_at = Instant::now();
|
|
|
+ new_metadata.status.version += 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ #[cfg(feature = "auth")]
|
|
|
+ if auth_client.is_some() {
|
|
|
+ new_metadata.auth_status.is_populated = true;
|
|
|
+ new_metadata.auth_status.last_fetched_at = Instant::now();
|
|
|
+ new_metadata.auth_status.version += 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ tracing::info!(
|
|
|
+ "Updated cache for {} with {} keysets (version {})",
|
|
|
+ self.mint_url,
|
|
|
+ new_metadata.keysets.len(),
|
|
|
+ new_metadata.status.version
|
|
|
+ );
|
|
|
+
|
|
|
+ // Atomically update cache
|
|
|
+ let metadata_arc = Arc::new(new_metadata);
|
|
|
+ self.metadata.store(metadata_arc.clone());
|
|
|
+ Ok(metadata_arc)
|
|
|
+ }
|
|
|
+
|
|
|
+ /// Get the mint URL this cache manages
|
|
|
+ pub fn mint_url(&self) -> &MintUrl {
|
|
|
+ &self.mint_url
|
|
|
+ }
|
|
|
+}
|
