feat(msg-bus): resubscribe topics on reconnect

2026-09-11 03:12:48 +02:00
parent 75a123ae6c
commit 41d25d3a3e
4 changed files with 122 additions and 0 deletions
@@ -0,0 +1,27 @@
+// Svelte 5 rune wrapper around `messageBus.onReconnect`.
+//
+// Fires the given callback the first time the WS reconnects after a
+// prior disconnect (server restart, network blip, sleep/wake).
+// **Not** called on the initial connect — the caller's own load path
+// is already fetching then. Bridges the "events published during the
+// disconnect window are lost" gap; consumers typically pass
+// `reload()` so the view catches up with the server after the outage.
+//
+// See `client.svelte.ts::onReconnect` for lifecycle details and
+// `project_message_bus_reconnect_gap` memory for the gap it closes.
+
+import { messageBus } from '$lib/message-bus/client.svelte';
+
+/**
+ * Register `cb` as a reconnect handler for the lifetime of the
+ * calling component. Auto-unregisters on destroy via `$effect`
+ * cleanup. Passing `null`/`undefined` is a no-op — convenient for
+ * conditional wiring (`useReconnect(handlers.onReconnect)`).
+ */
+export function useReconnect(cb: (() => void) | null | undefined): void {
+	$effect(() => {
+		if (!cb) return;
+		const release = messageBus.onReconnect(cb);
+		return () => release();
+	});
+}