All: Use Lerna to manage monorepo

packages/lib/net-utils.js

@@ -0,0 +1,40 @@
+const shim = require('./shim').default;
+
+const netUtils = {};
+
+netUtils.ip = async () => {
+	const response = await shim.fetch('https://api.ipify.org/?format=json');
+	if (!response.ok) {
+		throw new Error(`Could not retrieve IP: ${await response.text()}`);
+	}
+
+	const ip = await response.json();
+	return ip.ip;
+};
+
+netUtils.findAvailablePort = async (possiblePorts, extraRandomPortsToTry = 20) => {
+	const tcpPortUsed = require('tcp-port-used');
+
+	for (let i = 0; i < extraRandomPortsToTry; i++) {
+		possiblePorts.push(Math.floor(8000 + Math.random() * 2000));
+	}
+
+	let port = null;
+	for (let i = 0; i < possiblePorts.length; i++) {
+		const inUse = await tcpPortUsed.check(possiblePorts[i]);
+		if (!inUse) {
+			port = possiblePorts[i];
+			break;
+		}
+	}
+	return port;
+};
+
+netUtils.mimeTypeFromHeaders = headers => {
+	if (!headers || !headers['content-type']) return null;
+
+	const splitted = headers['content-type'].split(';');
+	return splitted[0].trim().toLowerCase();
+};
+
+module.exports = { netUtils };