Xetera/metrics.js

## metrics.js
import Random from "seedrandom";
import express from "express";

const alphabet = "abcdefghijklmnoprstuvwyz123456789////";

const random = (rnd: () => number, len: number, min = 0) =>
  Math.floor(rnd() * (len - min)) + min;

function generateEndpoints(salts: string[]) {
  return salts.map((salt) => {
    const rnd = Random(salt);

    const length = random(rnd, 30, 20);
    const extension = [...Array(length)]
      .map(() => {
        const num = random(rnd, alphabet.length);
        return alphabet[num];
      })
      .join("");

    // making sure we can't have double leading slashes in the generated url
    return `/${extension.replace(/^\/*/g, "")}`;
  });
}

const app = express();

const metricEndpoints = generateEndpoints(process.env.METRIC_SEEDS!.split(","));

const latestMetricEndpoint = metricEndpoints[1];

for (const endpoint of metricEndpoints) {
  console.log(`Listening for metrics on ${endpoint}`);
  app.post(endpoint, () => {
    console.log("User did something!");
  });
}

app.get("/", (_, res) => {
  res.write(
    `
      <!Doctype html>
      <html>
        <body>
          <h1>Let's make data-driven business decisions</h1>
          <script type="text/javascript">
            fetch("${latestMetricEndpoint}", { method: "POST" })
          </script>
        </body>
      </html>
    `
  );
});

app.listen(1234);
	import Random from "seedrandom";
	import express from "express";

	const alphabet = "abcdefghijklmnoprstuvwyz123456789////";

	const random = (rnd: () => number, len: number, min = 0) =>
	Math.floor(rnd() * (len - min)) + min;

	function generateEndpoints(salts: string[]) {
	return salts.map((salt) => {
	const rnd = Random(salt);

	const length = random(rnd, 30, 20);
	const extension = [...Array(length)]
	.map(() => {
	const num = random(rnd, alphabet.length);
	return alphabet[num];
	})
	.join("");

	// making sure we can't have double leading slashes in the generated url
	return `/${extension.replace(/^\/*/g, "")}`;
	});
	}

	const app = express();

	const metricEndpoints = generateEndpoints(process.env.METRIC_SEEDS!.split(","));

	const latestMetricEndpoint = metricEndpoints[1];

	for (const endpoint of metricEndpoints) {
	console.log(`Listening for metrics on ${endpoint}`);
	app.post(endpoint, () => {
	console.log("User did something!");
	});
	}

	app.get("/", (_, res) => {
	res.write(
	`
	<!Doctype html>
	<html>
	<body>
	<h1>Let's make data-driven business decisions</h1>
	<script type="text/javascript">
	fetch("${latestMetricEndpoint}", { method: "POST" })
	</script>
	</body>
	</html>
	`
	);
	});

	app.listen(1234);