pipeline: broadcast deletions to all known relays

src/firehose.ts

@@ -4,15 +4,15 @@ import { nostrNow } from '@/utils.ts';
 
 import * as pipeline from './pipeline.ts';
 
-const relays = await getActiveRelays();
+const _relays = await getActiveRelays();
-const pool = new RelayPool(relays);
+const pool = new RelayPool(_relays);
 
 // This file watches events on all known relays and performs
 // side-effects based on them, such as trending hashtag tracking
 // and storing events for notifications and the home feed.
 pool.subscribe(
   [{ kinds: [0, 1, 3, 5, 6, 7, 10002], limit: 0, since: nostrNow() }],
-  relays,
+  _relays,
   handleEvent,
   undefined,
   undefined,
@@ -26,3 +26,10 @@ function handleEvent(event: Event): Promise<void> {
     .handleEvent(event)
     .catch(() => {});
 }
+
+/** Publish an event to the given relays, or the entire pool. */
+function publish(event: Event, relays: string[] = _relays) {
+  return pool.publish(event, relays);
+}
+
+export { publish };

src/pipeline.ts

@@ -3,6 +3,7 @@ import * as eventsDB from '@/db/events.ts';
 import { addRelays } from '@/db/relays.ts';
 import { findUser } from '@/db/users.ts';
 import { type Event, LRUCache } from '@/deps.ts';
+import { publish } from '@/firehose.ts';
 import { isEphemeralKind } from '@/kinds.ts';
 import * as mixer from '@/mixer.ts';
 import { isLocallyFollowed } from '@/queries.ts';
@@ -27,6 +28,7 @@ async function handleEvent(event: Event): Promise<void> {
     trackRelays(event),
     trackHashtags(event),
     streamOut(event, data),
+    broadcast(event, data),
   ]);
 }
 
@@ -130,6 +132,18 @@ function streamOut(event: Event, data: EventData) {
   }
 }
 
+/**
+ * Publish the event to other relays.
+ * This should only be done in certain circumstances, like mentioning a user or publishing deletions.
+ */
+function broadcast(event: Event, data: EventData) {
+  if (!data.user || !isFresh(event)) return;
+
+  if (event.kind === 5) {
+    publish(event);
+  }
+}
+
 /** NIP-20 command line result. */
 class RelayError extends Error {
   constructor(prefix: 'duplicate' | 'pow' | 'blocked' | 'rate-limited' | 'invalid' | 'error', message: string) {