Best way to internally send a request to ALL running vms?

8

@carter is this Node.js or another runtime? Here’s some TypeScript from a node project doing this:

import { resolve6 } from "dns/promises";

async function getFlyInstances(): Promise<string[]> {
  let address = `global.${process.env.FLY_APP_NAME}.internal`;
  let ipv6s = await resolve6(address);
  return ipv6s.map((ip) => `http://[${ip}]:8080`);
}
const instances = await getFlyInstances();

    for (const instance of instances) {
      const url = new URL(instance);
      url.pathname = "/_refreshlocal";
      url.search = search;

      console.log(`forwarding post to ${url.toString()}`);

      // we purposefully don't await, we're just notifying everybody
      fetch(url.toString(), {
        method: "POST",
        headers: {
          Authorization: process.env.AUTH_TOKEN!,
        },
      });
    }

This grabs the internal IPv6 addresses, then sends an HTTP request to each of them in parallel.

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