api: cluster support

still missing synchronization for some structures

api/src/misc/cluster.js

@@ -0,0 +1,29 @@
+import net from "node:net";
+import cluster from "node:cluster";
+import { isCluster } from "../config.js";
+
+export const supportsReusePort = async () => {
+    try {
+        await new Promise((resolve, reject) => {
+            const server = net.createServer().listen({ port: 0, reusePort: true });
+            server.on('listening', () => server.close(resolve));
+            server.on('error', (err) => (server.close(), reject(err)));
+        });
+
+        return true;
+    } catch {
+        return false;
+    }
+}
+
+export const initCluster = async () => {
+    const { getSalt } = await import("../stream/manage.js");
+    const salt = getSalt();
+
+    for (let i = 1; i < env.instanceCount; ++i) {
+        const worker = cluster.fork();
+        worker.once('message', () => {
+            worker.send({ salt });
+        });
+    }
+}