PR Preview Environments

npm install dedalus-labs

import Dedalus from "dedalus-labs";
const dedalus = new Dedalus({ apiKey: process.env.DEDALUS_API_KEY! });

async function provisionPreview(prNumber: number, branch: string) {
  const m = await dedalus.machines.create({
    vcpu: 2,
    memory_mib: 4096,
    storage_gib: 20,
  });

  await runAndWait(m.machine_id, ["/bin/bash", "-c", `
    set -e
    apt-get update && apt-get install -y git nodejs postgresql
    git clone --depth 1 -b ${branch} https://github.com/your-org/your-app /root/app
    cd /root/app && npm install
    pg_ctlcluster 16 main start && createdb app && npm run migrate && npm run seed
    nohup npm run dev -- --host 0.0.0.0 --port 3000 >/var/log/app.log 2>&1 &
  `]);

  const port = await dedalus.machines.ports.create({
    machine_id: m.machine_id,
    port: 3000,
  });
  if (!port.url) throw new Error(`Port ${port.port_id} is not reachable yet: ${port.status}`);

  return { machineId: m.machine_id, url: port.url };
}

import http from "node:http";

http.createServer(async (req, res) => {
  const prNumber = parseInt(req.headers["x-pr-number"] as string);
  const machineId = await lookupMachine(prNumber);   // your DB

  await dedalus.machines.wake(machineId);
  // ...then proxy req to the port URL stored at provision time.
}).listen(8080);

async function teardownPreview(prNumber: number) {
  const machineId = await lookupMachine(prNumber);
  await dedalus.machines.delete(machineId);
}