Function pickEphemeralPort

apps/cli/src/daemon.ts:269–291

(hostname: string)

  });

const pickEphemeralPort = (hostname: string): Effect.Effect<number, Error> =>
  Effect.tryPromise({
    try: () =>
      new Promise<number>((resolve, reject) => {
        const server = createServer() as ProbeServer;

        server.once("error", (error: unknown) => {
          reject(error);
        });

        server.once("listening", () => {
          const address = server.address();
          const port = typeof address === "object" && address !== null ? address.port : 0;
          server.close(() => resolve(port));
        });

        server.listen({ port: 0, host: toProbeHost(hostname) });
      }),
    catch: (cause) =>
      cause instanceof Error
        ? cause
        : new Error(`Failed selecting ephemeral port: ${String(cause)}`),
  });

export const chooseDaemonPort = (input: {
  preferredPort: number;