feat: out-of-box experience (#2)

Reviewed-on: https://git.reya.su/reya/signed/pulls/2

crates/signed_nostr/src/backend.rs

@@ -1,6 +1,8 @@
+#[cfg(not(target_arch = "wasm32"))]
+use std::path::Path;
 use std::time::Duration;
 
-use anyhow::{Context, Result, anyhow};
+use anyhow::{Context, Result};
 use nostr_gossip_memory::prelude::*;
 #[cfg(not(target_arch = "wasm32"))]
 use nostr_lmdb::prelude::*;
@@ -10,117 +12,45 @@ use nostr_sdk::prelude::*;
 
 use crate::signer::UniversalSigner;
 
-/// Owns the nostr client: relay pool, LMDB database and signer.
+/// Open (or create) the LMDB database at `db_path` and build a client
+/// configured for Signed, together with a fresh signer.
 ///
-/// The SDK manages its own internal tokio runtime; every method here is a
-/// plain async fn that can be driven by GPUI's executors.
-#[derive(Clone)]
-pub struct NostrBackend {
-    client: Client,
-    signer: UniversalSigner,
+/// The SDK manages its own internal tokio runtime; the returned client can be
+/// driven by GPUI's executors.
+#[cfg(not(target_arch = "wasm32"))]
+pub async fn new_backend(db_path: impl AsRef<Path>) -> Result<(Client, UniversalSigner)> {
+    let signer = UniversalSigner::new(Keys::generate());
+    let database = NostrLmdb::open(db_path)
+        .await
+        .context("failed to open nostr database")?;
+    Ok(with_database(signer, database))
 }
 
-impl NostrBackend {
-    /// Open (or create) the LMDB database at `db_path` and build the client.
-    #[cfg(not(target_arch = "wasm32"))]
-    pub async fn new(db_path: impl AsRef<std::path::Path>) -> Result<Self> {
-        let signer = UniversalSigner::new(Keys::generate());
-        let database = NostrLmdb::open(db_path)
-            .await
-            .context("failed to open nostr database")?;
-        Ok(Self::with_database(signer, database))
-    }
-
-    /// In-memory database on wasm (no LMDB available).
-    #[cfg(target_arch = "wasm32")]
-    pub fn new() -> Result<Self> {
-        let signer = UniversalSigner::new(Keys::generate());
-        Ok(Self::with_database(signer, MemoryDatabase::unbounded()))
-    }
-
-    fn with_database<D>(signer: UniversalSigner, database: D) -> Self
-    where
-        D: IntoNostrDatabase,
-    {
-        let authenticator = SignerAuthenticator::new(signer.clone());
-
-        let client = ClientBuilder::default()
-            .database(database)
-            .authenticator(authenticator)
-            .gossip(NostrGossipMemory::unbounded())
-            .gossip_config(GossipConfig::default().no_background_refresh())
-            .connect_timeout(Duration::from_secs(10))
-            .verify_subscriptions(true)
-            .ban_relay_on_mismatch(true)
-            .sleep_when_idle(SleepWhenIdle::Enabled {
-                timeout: Duration::from_secs(600),
-            })
-            .build();
-
-        Self { client, signer }
-    }
-
-    pub fn client(&self) -> Client {
-        self.client.clone()
-    }
-
-    pub fn signer(&self) -> UniversalSigner {
-        self.signer.clone()
-    }
-
-    pub async fn add_relay(&self, url: &str) -> Result<()> {
-        self.client.add_relay(url).await?;
-        Ok(())
-    }
-
-    /// Add a relay used only for discovery (e.g. NIP-65 indexer relays).
-    /// No subscriptions or writes are routed through it.
-    pub async fn add_discovery_relay(&self, url: &str) -> Result<()> {
-        self.client
-            .add_relay(url)
-            .capabilities(RelayCapabilities::DISCOVERY)
-            .await?;
-        Ok(())
-    }
-
-    pub async fn connect(&self) {
-        self.client.connect().await;
-    }
-
-    /// Start a persistent subscription. Received events are stored in the
-    /// database automatically by the relay pool.
-    pub async fn subscribe(&self, filter: Filter) -> Result<SubscriptionId> {
-        let output = self.client.subscribe(filter).await?;
-        Ok(output.value)
-    }
-
-    /// Query the local database (the single source of truth for the UI).
-    pub async fn query(&self, filter: Filter) -> Result<Vec<Event>> {
-        let events = self.client.database().query(filter).await?;
-        Ok(events.into_iter().collect())
-    }
-
-    /// Sign with the current signer, broadcast, and save locally so the
-    /// event is immediately visible to [`NostrBackend::query`].
-    pub async fn send(&self, builder: EventBuilder) -> Result<Event> {
-        let event = builder.finalize_async(&self.signer).await?;
-
-        let output = self.client.send_event(&event).await?;
-
-        // Keep our own events in the local database; the notification pump
-        // only fires for events received from relays.
-        self.client.database().save_event(&event).await?;
-
-        if output.success.is_empty() && !output.failed.is_empty() {
-            let reasons = output
-                .failed
-                .values()
-                .cloned()
-                .collect::<Vec<String>>()
-                .join(", ");
-            return Err(anyhow!("event not accepted by any relay: {reasons}"));
-        }
-
-        Ok(event)
-    }
+/// In-memory database on wasm (no LMDB available).
+#[cfg(target_arch = "wasm32")]
+pub fn new_backend() -> Result<(Client, UniversalSigner)> {
+    let signer = UniversalSigner::new(Keys::generate());
+    Ok(with_database(signer, MemoryDatabase::unbounded()))
+}
+
+fn with_database<D>(signer: UniversalSigner, database: D) -> (Client, UniversalSigner)
+where
+    D: IntoNostrDatabase,
+{
+    let authenticator = SignerAuthenticator::new(signer.clone());
+
+    let client = ClientBuilder::default()
+        .database(database)
+        .authenticator(authenticator)
+        .gossip(NostrGossipMemory::unbounded())
+        .gossip_config(GossipConfig::default().no_background_refresh())
+        .connect_timeout(Duration::from_secs(10))
+        .verify_subscriptions(true)
+        .ban_relay_on_mismatch(true)
+        .sleep_when_idle(SleepWhenIdle::Enabled {
+            timeout: Duration::from_secs(600),
+        })
+        .build();
+
+    (client, signer)
 }