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A lexicon-driven AppView for ATProto.
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Rust
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use serde_json::Value;
use crate::AppState;use crate::db::{adapt_sql, now_rfc3339};use crate::event_log::{EventLog, Severity, log_event};use crate::lexicon::{LexiconType, ParsedLexicon, ProcedureAction};
/// The static collection we always include for lexicon schema updates.pub const LEXICON_SCHEMA_COLLECTION: &str = "com.atproto.lexicon.schema";
/// A generic record event that can originate from any source (Jetstream, backfill, etc.).pub struct RecordEvent { pub did: String, pub collection: String, pub rkey: String, pub action: String, pub record: Option<Value>, pub cid: Option<String>,}
/// Process a record event: upsert/delete the record in the database, run index/// hooks, and handle lexicon schema events.pub async fn handle_record_event(state: &AppState, record: &RecordEvent) { let db = &state.db; let lexicons = &state.lexicons;
let uri = format!("at://{}/{}/{}", record.did, record.collection, record.rkey);
// Handle lexicon schema events for tracked network lexicons. if record.collection == LEXICON_SCHEMA_COLLECTION { handle_lexicon_schema_event(state, &record.did, record).await; return; }
// Skip records whose collection is not tracked by a registered record-type lexicon. let is_tracked = lexicons .get(&record.collection) .await .is_some_and(|lex| lex.lexicon_type == LexiconType::Record);
if !is_tracked { tracing::debug!( collection = %record.collection, "skipping record for untracked collection" ); return; }
match record.action.as_str() { "create" | "update" => { let rec = match &record.record { Some(r) => r, None => return, }; let cid = record.cid.as_deref().unwrap_or_default();
// Run record-event script (if any) before storing. The script's // return value determines what gets written: // None → skip indexing entirely // Some(record) → upsert with that record body // The dispatcher cascades `record.<action>:<nsid>` → // `record.index:<nsid>`; failures are dead-lettered fail-open. let hook_result = crate::lua::run_record_event_script( state, crate::lua::RecordEventPayload { nsid: &record.collection, action: &record.action, uri: &uri, did: &record.did, rkey: &record.rkey, record: Some(rec), }, ) .await; let rec_to_store = match hook_result { None => { log_event( db, EventLog { event_type: "record.skipped".to_string(), severity: Severity::Info, actor_did: None, subject: Some(uri.clone()), detail: serde_json::json!({ "collection": record.collection, "did": record.did, "rkey": record.rkey, "reason": "script returned nil", }), }, state.db_backend, ) .await; return; } Some(v) => v, };
let now = now_rfc3339(); let backend = state.db_backend; let insert_sql = adapt_sql( r#" INSERT INTO happyview_records (uri, did, collection, rkey, record, cid, indexed_at, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?) ON CONFLICT (uri) DO UPDATE SET record = EXCLUDED.record, cid = EXCLUDED.cid, indexed_at = ? "#, backend, ); match sqlx::query(&insert_sql) .bind(&uri) .bind(&record.did) .bind(&record.collection) .bind(&record.rkey) .bind(serde_json::to_string(&rec_to_store).unwrap_or_default()) .bind(cid) .bind(&now) .bind(&now) .bind(&now) .execute(db) .await { Ok(_) => { let _ = crate::record_refs::sync_refs( db, &uri, &record.collection, &rec_to_store, backend, ) .await;
if state.verbose_event_logging.load(Ordering::Relaxed) { log_event( db, EventLog { event_type: "record.created".to_string(), severity: Severity::Info, actor_did: None, subject: Some(uri.clone()), detail: serde_json::json!({ "collection": record.collection, "did": record.did, "rkey": record.rkey, }), }, backend, ) .await; }
crate::labeler::backfill_labels_for_uri(Arc::new(state.clone()), uri.clone()); } Err(e) => { tracing::warn!(uri = %uri, "failed to upsert record: {e}"); log_event( db, EventLog { event_type: "record.created".to_string(), severity: Severity::Error, actor_did: None, subject: Some(uri.clone()), detail: serde_json::json!({ "collection": record.collection, "did": record.did, "rkey": record.rkey, "error": e.to_string(), }), }, backend, ) .await; } } } "delete" => { let backend = state.db_backend;
// Run record-event script (if any) before deleting. A nil // return aborts the delete; any other return continues. let hook_result = crate::lua::run_record_event_script( state, crate::lua::RecordEventPayload { nsid: &record.collection, action: "delete", uri: &uri, did: &record.did, rkey: &record.rkey, record: None, }, ) .await; if hook_result.is_none() { log_event( db, EventLog { event_type: "record.skipped".to_string(), severity: Severity::Info, actor_did: None, subject: Some(uri.clone()), detail: serde_json::json!({ "collection": record.collection, "did": record.did, "rkey": record.rkey, "reason": "script returned nil", }), }, backend, ) .await; return; }
let delete_sql = adapt_sql("DELETE FROM happyview_records WHERE uri = ?", backend); match sqlx::query(&delete_sql).bind(&uri).execute(db).await { Ok(_) => { if state.verbose_event_logging.load(Ordering::Relaxed) { log_event( db, EventLog { event_type: "record.deleted".to_string(), severity: Severity::Info, actor_did: None, subject: Some(uri.clone()), detail: serde_json::json!({ "collection": record.collection, "did": record.did, "rkey": record.rkey, }), }, backend, ) .await; } } Err(e) => { tracing::warn!(uri = %uri, "failed to delete record: {e}"); log_event( db, EventLog { event_type: "record.deleted".to_string(), severity: Severity::Error, actor_did: None, subject: Some(uri.clone()), detail: serde_json::json!({ "collection": record.collection, "did": record.did, "rkey": record.rkey, "error": e.to_string(), }), }, backend, ) .await; } } } _ => {} }}
/// Handle a `com.atproto.lexicon.schema` record event for tracked network lexicons.pub async fn handle_lexicon_schema_event(state: &AppState, did: &str, record: &RecordEvent) { let db = &state.db; let lexicons = &state.lexicons; let collections_tx = &state.collections_tx; let nsid = &record.rkey;
let backend = state.db_backend;
// Check if this NSID is one we're tracking and the DID matches the authority. let select_sql = adapt_sql( "SELECT target_collection FROM happyview_lexicons WHERE id = ? AND source = 'network' AND authority_did = ?", backend, ); let tracked: Option<(Option<String>,)> = sqlx::query_as(&select_sql) .bind(nsid) .bind(did) .fetch_optional(db) .await .unwrap_or(None);
let target_collection = match tracked { Some((tc,)) => tc, None => return, // Not a tracked network lexicon. };
match record.action.as_str() { "create" | "update" => { let rec = match &record.record { Some(r) => r, None => return, };
let parsed = match ParsedLexicon::parse( rec.clone(), 1, target_collection.clone(), ProcedureAction::Upsert, None, ) { Ok(p) => p, Err(e) => { tracing::warn!(nsid, "failed to parse lexicon schema event: {e}"); return; } };
let is_record = parsed.lexicon_type == crate::lexicon::LexiconType::Record;
// Upsert into lexicons table with last_fetched_at. let now = now_rfc3339(); let upsert_sql = adapt_sql( r#" INSERT INTO happyview_lexicons (id, lexicon_json, backfill, target_collection, source, authority_did, last_fetched_at, created_at) VALUES (?, ?, 0, ?, 'network', ?, ?, ?) ON CONFLICT (id) DO UPDATE SET lexicon_json = EXCLUDED.lexicon_json, target_collection = EXCLUDED.target_collection, last_fetched_at = ?, revision = happyview_lexicons.revision + 1, updated_at = ? "#, backend, ); if let Err(e) = sqlx::query(&upsert_sql) .bind(nsid) .bind(serde_json::to_string(rec).unwrap_or_default()) .bind(&target_collection) .bind(did) .bind(&now) .bind(&now) .bind(&now) .bind(&now) .execute(db) .await { tracing::warn!(nsid, "failed to upsert lexicon from event: {e}"); return; }
lexicons.upsert(parsed).await; tracing::info!(nsid, "updated network lexicon from network event");
if is_record { let collections = lexicons.get_record_collections().await; let _ = collections_tx.send(collections); } } "delete" => { // Remove from lexicons table and registry. let delete_sql = adapt_sql("DELETE FROM happyview_lexicons WHERE id = ?", backend); let _ = sqlx::query(&delete_sql).bind(nsid).execute(db).await;
let was_present = lexicons.remove(nsid).await; if was_present { tracing::info!(nsid, "removed network lexicon from network delete event"); let collections = lexicons.get_record_collections().await; let _ = collections_tx.send(collections); } } _ => {} }}