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A lexicon-driven AppView for ATProto.
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use futures_util::StreamExt;use serde::Deserialize;use serde_json::Value;use sqlx::AnyPool;use tokio::sync::{Semaphore, watch};use tokio_tungstenite::tungstenite::Message;
use crate::AppState;use crate::db::{DatabaseBackend, adapt_sql, now_rfc3339};use crate::event_log::{EventLog, Severity, log_event};use crate::record_handler::{self, LEXICON_SCHEMA_COLLECTION, RecordEvent};
// ---------------------------------------------------------------------------// Jetstream event types// ---------------------------------------------------------------------------
#[derive(Deserialize)]struct JetstreamEvent { #[serde(rename = "kind")] event_type: String, did: String, time_us: i64, commit: Option<CommitEvent>, identity: Option<IdentityEvent>,}
#[derive(Deserialize)]struct CommitEvent { operation: String, collection: String, rkey: String, record: Option<Value>, cid: Option<String>,}
#[derive(Deserialize)]struct IdentityEvent { did: String, handle: Option<String>,}
// ---------------------------------------------------------------------------// Cursor persistence// ---------------------------------------------------------------------------
async fn load_cursor(db: &AnyPool, backend: DatabaseBackend) -> Option<i64> { let sql = adapt_sql( "SELECT value FROM happyview_instance_settings WHERE key = ?", backend, ); let row: Option<(String,)> = crate::db::query_as(&sql) .bind("jetstream_cursor") .fetch_optional(db) .await .ok()?; row.and_then(|(v,)| v.parse::<i64>().ok())}
async fn save_cursor(db: &AnyPool, backend: DatabaseBackend, cursor: i64) { let now = now_rfc3339(); let sql = adapt_sql( r#" INSERT INTO happyview_instance_settings (key, value, updated_at) VALUES (?, ?, ?) ON CONFLICT (key) DO UPDATE SET value = ?, updated_at = ? "#, backend, ); if let Err(e) = crate::db::query(&sql) .bind("jetstream_cursor") .bind(cursor.to_string()) .bind(&now) .bind(cursor.to_string()) .bind(&now) .execute(db) .await { tracing::warn!("failed to save jetstream cursor: {e}"); }}
// ---------------------------------------------------------------------------// URL builder// ---------------------------------------------------------------------------
fn build_subscribe_url(base_url: &str, collections: &[String]) -> String { let base = base_url.trim_end_matches('/'); let mut url = format!("{base}/subscribe?compress=false");
let mut has_lexicon_schema = false; for col in collections { url.push_str(&format!("&wantedCollections={col}")); if col == LEXICON_SCHEMA_COLLECTION { has_lexicon_schema = true; } }
if !has_lexicon_schema { url.push_str(&format!("&wantedCollections={LEXICON_SCHEMA_COLLECTION}")); }
url}
// ---------------------------------------------------------------------------// Public API// ---------------------------------------------------------------------------
/// Spawn a background task that connects to Jetstream's WebSocket stream and/// processes record + identity events. Uses exponential backoff on disconnects.pub fn spawn(state: AppState, mut collections_rx: watch::Receiver<Vec<String>>) { tokio::spawn(async move { let mut backoff = Duration::from_secs(2); let max_backoff = Duration::from_secs(60);
loop { match run(&state, &mut collections_rx).await { Ok(()) => { // Clean reconnect (collection change) — reset backoff. backoff = Duration::from_secs(2); tracing::info!("jetstream reconnecting due to collection change"); } Err(e) => { tracing::warn!("jetstream disconnected: {e}"); tracing::info!( backoff_secs = backoff.as_secs(), "reconnecting to jetstream after backoff" ); tokio::time::sleep(backoff).await; backoff = (backoff * 2).min(max_backoff); } } } });}
// ---------------------------------------------------------------------------// Connection loop// ---------------------------------------------------------------------------
async fn run( state: &AppState, collections_rx: &mut watch::Receiver<Vec<String>>,) -> Result<(), Box<dyn std::error::Error + Send + Sync>> { let db = &state.db; let backend = state.db_backend;
// Build subscribe URL with current collections. let collections = collections_rx.borrow().clone(); let url = build_subscribe_url(&state.config.jetstream_url, &collections);
// Load cursor from DB; skip if older than 72 hours. let cursor = load_cursor(db, backend).await; let subscribe_url = if let Some(c) = cursor { let now_us = chrono::Utc::now().timestamp_micros(); let age_hours = (now_us - c) as f64 / 3_600_000_000.0; if age_hours > 72.0 { tracing::warn!( cursor = c, age_hours = age_hours, "jetstream cursor is older than 72 hours, skipping it" ); url } else { format!("{url}&cursor={c}") } } else { url };
tracing::info!(url = %subscribe_url, "connecting to jetstream");
let (ws, _): ( tokio_tungstenite::WebSocketStream< tokio_tungstenite::MaybeTlsStream<tokio::net::TcpStream>, >, _, ) = tokio::time::timeout( Duration::from_secs(15), tokio_tungstenite::connect_async(&subscribe_url), ) .await .map_err(|_| "jetstream websocket connection timed out after 15s")??;
log_event( db, EventLog { event_type: "jetstream.connected".to_string(), severity: Severity::Info, actor_did: None, subject: None, detail: serde_json::json!({ "url": subscribe_url }), }, backend, ) .await;
let (_write, mut read) = ws.split();
let semaphore = Arc::new(Semaphore::new(50));
// Cursor batching state: save every 1000 events or 5 seconds. let mut latest_cursor: Option<i64> = cursor; let mut events_since_flush: u64 = 0; let mut last_flush = Instant::now(); let flush_interval = Duration::from_secs(5); const FLUSH_EVENT_THRESHOLD: u64 = 1000;
loop { tokio::select! { msg = read.next() => { let msg = match msg { Some(Ok(m)) => m, Some(Err(e)) => { tracing::warn!("jetstream websocket read error: {e}"); // Flush cursor before returning error. if let Some(c) = latest_cursor { save_cursor(db, backend, c).await; } log_event( db, EventLog { event_type: "jetstream.disconnected".to_string(), severity: Severity::Warn, actor_did: None, subject: None, detail: serde_json::json!({ "reason": e.to_string() }), }, backend, ) .await; return Err(e.into()); } None => { tracing::info!("jetstream websocket stream ended"); break; } };
let text = match msg { Message::Text(t) => t, Message::Close(_) => { tracing::info!("jetstream websocket received close frame"); break; } other => { tracing::debug!(msg_type = ?other, "ignoring non-text websocket message"); continue; } };
let event: JetstreamEvent = match serde_json::from_str(&text) { Ok(e) => e, Err(e) => { tracing::warn!("skipping unparseable jetstream event: {e}"); continue; } };
// Update cursor tracking. latest_cursor = Some(event.time_us); events_since_flush += 1;
match event.event_type.as_str() { "commit" => { if let Some(commit) = event.commit { tracing::debug!( operation = %commit.operation, collection = %commit.collection, did = %event.did, rkey = %commit.rkey, "received commit event from jetstream" );
let record_event = RecordEvent { did: event.did.clone(), collection: commit.collection, rkey: commit.rkey, action: commit.operation, record: commit.record, cid: commit.cid, };
let sem = semaphore.clone(); let state = state.clone(); tokio::spawn(async move { let _permit = sem.acquire().await.unwrap(); record_handler::handle_record_event(&state, &record_event).await; }); } } "identity" => { if let Some(identity) = event.identity { tracing::debug!( did = %identity.did, handle = ?identity.handle, "received identity event from jetstream" ); } } "account" => { tracing::debug!( did = %event.did, "received account event from jetstream (ignored)" ); } other => { tracing::debug!(event_type = %other, "unknown jetstream event type"); } }
// Flush cursor periodically. if (events_since_flush >= FLUSH_EVENT_THRESHOLD || last_flush.elapsed() >= flush_interval) && let Some(c) = latest_cursor { save_cursor(db, backend, c).await; events_since_flush = 0; last_flush = Instant::now(); } } _ = collections_rx.changed() => { let new_collections = collections_rx.borrow_and_update().clone(); tracing::info!(?new_collections, "collection filter changed, reconnecting to jetstream");
// Flush cursor before reconnecting. if let Some(c) = latest_cursor { save_cursor(db, backend, c).await; }
return Ok(()); } } }
// Stream ended cleanly — flush cursor and log disconnect. if let Some(c) = latest_cursor { save_cursor(db, backend, c).await; }
log_event( db, EventLog { event_type: "jetstream.disconnected".to_string(), severity: Severity::Warn, actor_did: None, subject: None, detail: serde_json::json!({ "reason": "connection closed" }), }, backend, ) .await;
Ok(())}
// ---------------------------------------------------------------------------// Tests// ---------------------------------------------------------------------------
#[cfg(test)]mod tests { use super::*;
#[test] fn test_build_subscribe_url_basic() { let url = build_subscribe_url( "https://jetstream.example.com", &["app.bsky.feed.post".to_string()], ); assert!(url.starts_with("https://jetstream.example.com/subscribe?compress=false")); assert!(url.contains("&wantedCollections=app.bsky.feed.post")); assert!(url.contains(&format!("&wantedCollections={LEXICON_SCHEMA_COLLECTION}"))); }
#[test] fn test_build_subscribe_url_strips_trailing_slash() { let url = build_subscribe_url( "https://jetstream.example.com/", &["app.bsky.feed.post".to_string()], ); assert!(url.starts_with("https://jetstream.example.com/subscribe")); assert!(!url.contains("//subscribe")); }
#[test] fn test_build_subscribe_url_does_not_duplicate_lexicon_schema() { let url = build_subscribe_url( "https://jetstream.example.com", &[ "app.bsky.feed.post".to_string(), LEXICON_SCHEMA_COLLECTION.to_string(), ], ); let count = url.matches(LEXICON_SCHEMA_COLLECTION).count(); assert_eq!( count, 1, "lexicon schema collection should appear exactly once" ); }
#[test] fn test_build_subscribe_url_empty_collections() { let url = build_subscribe_url("https://jetstream.example.com", &[]); assert!(url.contains(&format!("&wantedCollections={LEXICON_SCHEMA_COLLECTION}"))); }
#[test] fn test_deserialize_commit_event() { let json = r#"{ "kind": "commit", "did": "did:plc:abc123", "time_us": 1700000000000000, "commit": { "operation": "create", "collection": "app.bsky.feed.post", "rkey": "3k2y6e7wh4k2a", "record": {"text": "hello world", "$type": "app.bsky.feed.post"}, "cid": "bafyreiabc123" } }"#;
let event: JetstreamEvent = serde_json::from_str(json).unwrap(); assert_eq!(event.event_type, "commit"); assert_eq!(event.did, "did:plc:abc123"); assert_eq!(event.time_us, 1700000000000000);
let commit = event.commit.unwrap(); assert_eq!(commit.operation, "create"); assert_eq!(commit.collection, "app.bsky.feed.post"); assert_eq!(commit.rkey, "3k2y6e7wh4k2a"); assert!(commit.record.is_some()); assert_eq!(commit.cid.as_deref(), Some("bafyreiabc123")); }
#[test] fn test_deserialize_identity_event() { let json = r#"{ "kind": "identity", "did": "did:plc:abc123", "time_us": 1700000000000000, "identity": { "did": "did:plc:abc123", "handle": "alice.bsky.social" } }"#;
let event: JetstreamEvent = serde_json::from_str(json).unwrap(); assert_eq!(event.event_type, "identity");
let identity = event.identity.unwrap(); assert_eq!(identity.did, "did:plc:abc123"); assert_eq!(identity.handle.as_deref(), Some("alice.bsky.social")); }
#[test] fn test_deserialize_delete_commit_no_record() { let json = r#"{ "kind": "commit", "did": "did:plc:abc123", "time_us": 1700000000000000, "commit": { "operation": "delete", "collection": "app.bsky.feed.post", "rkey": "3k2y6e7wh4k2a" } }"#;
let event: JetstreamEvent = serde_json::from_str(json).unwrap(); let commit = event.commit.unwrap(); assert_eq!(commit.operation, "delete"); assert!(commit.record.is_none()); assert!(commit.cid.is_none()); }}