Queue native collection launches before async placement

src/lib/server/provisioning/launch-worker.ts

@@ -5,9 +5,17 @@ import { relDestForKind } from '../config.js';
 import { captureRecipe, summarizeRecipe } from '../fleet/launch-recipes.js';
 import { sha256Buffer } from '../fleet/files.js';
 import type { NativeLaunchInput } from './launch-preparation.js';
+import { choosePlacement, type PlacementOptions } from '../hosts/capacity.js';
 
-parentPort!.on('message', ({ id, input }: { id: number; input: NativeLaunchInput }) => {
+parentPort!.on('message', (message: { id: number; kind: 'launch'; input: NativeLaunchInput } | { id: number; kind: 'placement'; input: PlacementOptions }) => {
+    const { id } = message;
     try {
+        if (message.kind === 'placement') {
+            const decision = db().transaction(() => choosePlacement(message.input))();
+            parentPort!.postMessage({ id, value: { hostId: decision.host.id, lastHeartbeat: decision.host.lastHeartbeat } });
+            return;
+        }
+        const input = message.input;
         // All file versions and composed configuration belong to one snapshot.
         const recipe = db().transaction(() => ({ ...captureRecipe(input.game, input.mapSlug),
             native: input.native, image: input.instance.image }))();