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database: add downcasting support for NostrDatabase
Implement downcasting for `NostrDatabase`, allowing access to concrete database types. Pull-Request: #845 Signed-off-by: Yuki Kishimoto <yukikishimoto@protonmail.com>
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6 files changed

+112
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lines changed

‎Cargo.lock

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‎Cargo.toml

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@@ -33,6 +33,7 @@ nostr-relay-builder = { version = "0.42", path = "./crates/nostr-relay-builder",
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nostr-relay-pool = { version = "0.42", path = "./crates/nostr-relay-pool", default-features = false }
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nostr-sdk = { version = "0.42", path = "./crates/nostr-sdk", default-features = false }
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reqwest = { version = "0.12", default-features = false }
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rustversion = "1.0"
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serde = { version = "1.0", default-features = false }
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serde_json = { version = "1.0", default-features = false }
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tempfile = "3.19"

‎crates/nostr-database/Cargo.toml

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@@ -19,6 +19,7 @@ flatbuf = ["dep:flatbuffers"]
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flatbuffers = { version = "23.5", optional = true }
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lru.workspace = true
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nostr = { workspace = true, features = ["std"] }
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rustversion.workspace = true
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tokio = { workspace = true, features = ["sync"] }
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[dev-dependencies]

‎crates/nostr-database/src/lib.rs

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@@ -193,6 +193,43 @@ pub trait NostrDatabase: Any + Debug + Send + Sync {
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fn wipe(&self) -> BoxedFuture<Result<(), DatabaseError>>;
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}
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#[rustversion::since(1.86)]
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impl dyn NostrDatabase {
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/// Upcast to [`Any`].
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#[inline]
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fn as_any(&self) -> &dyn Any {
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self
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}
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/// Upcast to [`Any`].
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#[inline]
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fn as_any_arc(self: Arc<Self>) -> Arc<dyn Any + Send + Sync> {
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self
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}
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/// Downcast [`NostrDatabase`] to a concrete type reference.
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///
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/// **Requires rustc >= 1.86!**
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#[inline]
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pub fn downcast_ref<T>(&self) -> Option<&T>
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where
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T: NostrDatabase,
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{
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self.as_any().downcast_ref()
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}
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/// Downcast [`NostrDatabase`] to a concrete type.
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///
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/// **Requires rustc >= 1.86!**
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#[inline]
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pub fn downcast<T>(self: Arc<Self>) -> Option<Arc<T>>
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where
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T: NostrDatabase,
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{
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self.as_any_arc().downcast().ok()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;

‎crates/nostr-sdk/examples/lmdb.rs

Lines changed: 51 additions & 40 deletions
Original file line numberDiff line numberDiff line change
@@ -16,47 +16,58 @@ async fn main() -> Result<()> {
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.database(database)
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.build();
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client.add_relay("wss://relay.damus.io").await?;
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client.add_relay("wss://nostr.wine").await?;
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client.add_relay("wss://nostr.oxtr.dev").await?;
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client.connect().await;
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// Publish a text note
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let builder = EventBuilder::text_note("Hello world");
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client.send_event_builder(builder).await?;
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// Negentropy sync
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let filter = Filter::new().author(keys.public_key());
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let (tx, mut rx) = SyncProgress::channel();
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let opts = SyncOptions::default().progress(tx);
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tokio::spawn(async move {
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while rx.changed().await.is_ok() {
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let progress = *rx.borrow_and_update();
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if progress.total > 0 {
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println!("{:.2}%", progress.percentage() * 100.0);
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}
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}
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});
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let output = client.sync(filter, &opts).await?;
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println!("Local: {}", output.local.len());
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println!("Remote: {}", output.remote.len());
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println!("Sent: {}", output.sent.len());
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println!("Received: {}", output.received.len());
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println!("Failures:");
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for (url, map) in output.send_failures.iter() {
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println!("* '{url}':");
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for (id, e) in map.iter() {
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println!(" - {id}: {e}");
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}
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}
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// client.add_relay("wss://relay.damus.io").await?;
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// client.add_relay("wss://nostr.wine").await?;
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// client.add_relay("wss://nostr.oxtr.dev").await?;
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//
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// client.connect().await;
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// // Publish a text note
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// let builder = EventBuilder::text_note("Hello world");
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// client.send_event_builder(builder).await?;
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// // Negentropy sync
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// let filter = Filter::new().author(keys.public_key());
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// let (tx, mut rx) = SyncProgress::channel();
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// let opts = SyncOptions::default().progress(tx);
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//
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// tokio::spawn(async move {
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// while rx.changed().await.is_ok() {
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// let progress = *rx.borrow_and_update();
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// if progress.total > 0 {
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// println!("{:.2}%", progress.percentage() * 100.0);
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// }
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// }
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// });
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// let output = client.sync(filter, &opts).await?;
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//
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// println!("Local: {}", output.local.len());
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// println!("Remote: {}", output.remote.len());
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// println!("Sent: {}", output.sent.len());
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// println!("Received: {}", output.received.len());
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// println!("Failures:");
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// for (url, map) in output.send_failures.iter() {
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// println!("* '{url}':");
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// for (id, e) in map.iter() {
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// println!(" - {id}: {e}");
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// }
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// }
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//
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// // Query events from database
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// let filter = Filter::new().author(keys.public_key()).limit(10);
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// let events = client.database().query(filter).await?;
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// println!("Events: {events:?}");
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// Query events from database
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let filter = Filter::new().author(keys.public_key()).limit(10);
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let events = client.database().query(filter).await?;
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println!("Events: {events:?}");
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// Database downcasting
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// let database = client.database().clone();
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// let upcast = database as Arc<dyn Any + Send + Sync>;
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// let lmdb: &NostrLMDB = upcast.downcast_ref().unwrap();
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//let lmdb: &NostrLMDB = (database as &dyn Any).downcast_ref::<NostrLMDB>().unwrap();
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// Database downcasting to access to specific APIs
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if let Some(_lmdb) = client.database().downcast_ref::<NostrLMDB>() {
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// Access specific APIs here
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}
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Ok(())
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}

‎crates/nostr-sdk/examples/nostrdb.rs

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Original file line numberDiff line numberDiff line change
@@ -18,22 +18,27 @@ async fn main() -> Result<()> {
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.database(database)
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.build();
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client.add_relay("wss://relay.damus.io").await?;
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client.add_relay("wss://atl.purplerelay.com").await?;
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client.connect().await;
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// Publish a text note
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let builder = EventBuilder::text_note("Hello world");
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client.send_event_builder(builder).await?;
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// Negentropy reconcile
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let filter = Filter::new().author(keys.public_key());
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client.sync(filter, &SyncOptions::default()).await?;
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// Query events from database
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let filter = Filter::new().author(keys.public_key()).limit(10);
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let events = client.database().query(filter).await?;
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println!("Events: {events:?}");
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// client.add_relay("wss://relay.damus.io").await?;
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// client.add_relay("wss://atl.purplerelay.com").await?;
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// client.connect().await;
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//
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// // Publish a text note
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// let builder = EventBuilder::text_note("Hello world");
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// client.send_event_builder(builder).await?;
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//
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// // Negentropy reconcile
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// let filter = Filter::new().author(keys.public_key());
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// client.sync(filter, &SyncOptions::default()).await?;
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//
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// // Query events from database
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// let filter = Filter::new().author(keys.public_key()).limit(10);
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// let events = client.database().query(filter).await?;
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// println!("Events: {events:?}");
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// Database downcasting to access to specific APIs
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if let Some(ndb) = client.database().downcast_ref::<NdbDatabase>() {
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println!("Subscription counts: {}", ndb.subscription_count());
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}
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Ok(())
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}

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