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A lexicon-driven AppView for ATProto.
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Rust
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#[derive(Debug, thiserror::Error)]pub enum KvError { #[error("Storage quota exceeded: {0} > {MAX_KV_SIZE_PER_USER}")] QuotaExceeded(u64), #[error("Database error: {0}")] Database(#[from] sqlx::Error),}
pub async fn kv_get(ctx: &HostContext, key: &str) -> Result<Option<Vec<u8>>, KvError> { let sql = adapt_sql( "SELECT value FROM happyview_plugin_kv WHERE plugin_id = ? AND scope = ? AND key = ? AND (expires_at IS NULL OR expires_at > datetime('now'))", ctx.db_backend, );
let result: Option<(Vec<u8>,)> = crate::db::query_as(&sql) .bind(&ctx.plugin_id) .bind(&ctx.scope) .bind(key) .fetch_optional(&ctx.db) .await?;
Ok(result.map(|(v,)| v))}
pub async fn kv_set( ctx: &HostContext, usage: &mut ResourceUsage, key: &str, value: Vec<u8>, ttl_secs: Option<u32>,) -> Result<(), KvError> { // Check quota (simple check - full implementation would sum all keys) usage.kv_bytes_used += value.len() as u64; if usage.kv_bytes_used > MAX_KV_SIZE_PER_USER { return Err(KvError::QuotaExceeded(usage.kv_bytes_used)); }
let expires_at = ttl_secs .map(|secs| (chrono::Utc::now() + chrono::Duration::seconds(secs as i64)).to_rfc3339());
// Upsert let sql = adapt_sql( "INSERT INTO happyview_plugin_kv (plugin_id, scope, key, value, expires_at, created_at) VALUES (?, ?, ?, ?, ?, datetime('now')) ON CONFLICT (plugin_id, scope, key) DO UPDATE SET value = excluded.value, expires_at = excluded.expires_at", ctx.db_backend, );
crate::db::query(&sql) .bind(&ctx.plugin_id) .bind(&ctx.scope) .bind(key) .bind(&value) .bind(expires_at) .execute(&ctx.db) .await?;
Ok(())}
pub async fn kv_delete(ctx: &HostContext, key: &str) -> Result<(), KvError> { let sql = adapt_sql( "DELETE FROM happyview_plugin_kv WHERE plugin_id = ? AND scope = ? AND key = ?", ctx.db_backend, );
crate::db::query(&sql) .bind(&ctx.plugin_id) .bind(&ctx.scope) .bind(key) .execute(&ctx.db) .await?;
Ok(())}
#[cfg(test)]mod tests { use super::*;
#[test] fn test_quota_exceeded_check() { let mut usage = ResourceUsage { kv_bytes_used: MAX_KV_SIZE_PER_USER, ..Default::default() };
// Adding more would exceed quota usage.kv_bytes_used += 1; assert!(usage.kv_bytes_used > MAX_KV_SIZE_PER_USER); }
#[test] fn test_kv_error_display() { let err = KvError::QuotaExceeded(2_000_000); assert!(err.to_string().contains("exceeded")); }}