Backup before continuing from Codex 5.2 session - User storage, compaction suggestions, streaming improvements

packages/server/src/utils/port.ts

@@ -0,0 +1,35 @@
+import net from "net"
+
+const DEFAULT_START_PORT = 3000
+const MAX_PORT_ATTEMPTS = 50
+
+function isPortAvailable(port: number): Promise<boolean> {
+  return new Promise((resolve) => {
+    const server = net.createServer()
+    server.once("error", () => {
+      resolve(false)
+    })
+    server.once("listening", () => {
+      server.close()
+      resolve(true)
+    })
+    server.listen(port, "127.0.0.1")
+  })
+}
+
+export async function findAvailablePort(startPort: number = DEFAULT_START_PORT): Promise<number> {
+  for (let port = startPort; port < startPort + MAX_PORT_ATTEMPTS; port++) {
+    if (await isPortAvailable(port)) {
+      return port
+    }
+  }
+  return 0
+}
+
+export async function getAvailablePort(preferredPort: number = DEFAULT_START_PORT): Promise<number> {
+  const isAvailable = await isPortAvailable(preferredPort)
+  if (isAvailable) {
+    return preferredPort
+  }
+  return findAvailablePort(preferredPort + 1)
+}