Cache save details on the controller

Keep a copy of the instance saves details on the controller so that
saves can be queried even when the host is disconnected and the
controller can properly track and provide updates on the saves to
its clients.

packages/controller/src/HostConnection.ts

@@ -82,7 +82,7 @@ export default class HostConnection extends BaseConnection {
 
 		this.handle(lib.InstanceStatusChangedEvent, this.handleInstanceStatusChangedEvent.bind(this));
 		this.handle(lib.InstancesUpdateRequest, this.handleInstancesUpdateRequest.bind(this));
-		this.handle(lib.InstanceSaveListUpdateEvent, this.handleInstanceSaveListUpdateEvent.bind(this));
+		this.handle(lib.InstanceSaveDetailsUpdatesEvent, this.handleInstanceSaveDetailsUpdatesEvent.bind(this));
 		this.handle(lib.LogMessageEvent, this.handleLogMessageEvent.bind(this));
 		this.handle(lib.InstancePlayerUpdateEvent, this.handleInstancePlayerUpdateEvent.bind(this));
 	}
@@ -268,8 +268,31 @@ export default class HostConnection extends BaseConnection {
 		await this.send(new lib.SyncUserListsEvent(adminlist, banlist, whitelist));
 	}
 
-	async handleInstanceSaveListUpdateEvent(event: lib.InstanceSaveListUpdateEvent) {
-		this._controller.saveListUpdate(event.instanceId, event.saves);
+	async handleInstanceSaveDetailsUpdatesEvent(event: lib.InstanceSaveDetailsUpdatesEvent) {
+		const updates: lib.SaveDetails[] = [];
+		for (const save of event.updates) {
+			const existingSave = this._controller.saves.get(save.id);
+			if (existingSave && save.equals(existingSave)) {
+				continue;
+			}
+			this._controller.saves.set(save.id, save);
+			updates.push(save);
+		}
+		if (event.instanceId !== undefined) {
+			const updatedSaves = new Set(event.updates.map(s => s.id));
+			for (const [id, save] of this._controller.saves) {
+				if (save.instanceId === event.instanceId && !updatedSaves.has(id)) {
+					save.isDeleted = true;
+					updates.push(save);
+					this._controller.saves.delete(id);
+				}
+			}
+		}
+		// Hosts eagerly send updates, which means we may get an update
+		// where nothing actualy changed.
+		if (updates.length) {
+			this._controller.savesUpdated(updates);
+		}
 	}
 
 	async handleLogMessageEvent(event: lib.LogMessageEvent) {