1 files changed, 99 insertions, 0 deletions
diff --git a/node_modules/@szmarczak/http-timer/source/index.js b/node_modules/@szmarczak/http-timer/source/index.js
new file mode 100755
index 0000000..e294580
--- /dev/null
+++ b/node_modules/@szmarczak/http-timer/source/index.js
@@ -0,0 +1,99 @@
+'use strict';
+const deferToConnect = require('defer-to-connect');
+
+module.exports = request => {
+	const timings = {
+		start: Date.now(),
+		socket: null,
+		lookup: null,
+		connect: null,
+		upload: null,
+		response: null,
+		end: null,
+		error: null,
+		phases: {
+			wait: null,
+			dns: null,
+			tcp: null,
+			request: null,
+			firstByte: null,
+			download: null,
+			total: null
+		}
+	};
+
+	const handleError = origin => {
+		const emit = origin.emit.bind(origin);
+		origin.emit = (event, ...args) => {
+			// Catches the `error` event
+			if (event === 'error') {
+				timings.error = Date.now();
+				timings.phases.total = timings.error - timings.start;
+
+				origin.emit = emit;
+			}
+
+			// Saves the original behavior
+			return emit(event, ...args);
+		};
+	};
+
+	let uploadFinished = false;
+	const onUpload = () => {
+		timings.upload = Date.now();
+		timings.phases.request = timings.upload - timings.connect;
+	};
+
+	handleError(request);
+
+	request.once('socket', socket => {
+		timings.socket = Date.now();
+		timings.phases.wait = timings.socket - timings.start;
+
+		const lookupListener = () => {
+			timings.lookup = Date.now();
+			timings.phases.dns = timings.lookup - timings.socket;
+		};
+
+		socket.once('lookup', lookupListener);
+
+		deferToConnect(socket, () => {
+			timings.connect = Date.now();
+
+			if (timings.lookup === null) {
+				socket.removeListener('lookup', lookupListener);
+				timings.lookup = timings.connect;
+				timings.phases.dns = timings.lookup - timings.socket;
+			}
+
+			timings.phases.tcp = timings.connect - timings.lookup;
+
+			if (uploadFinished && !timings.upload) {
+				onUpload();
+			}
+		});
+	});
+
+	request.once('finish', () => {
+		uploadFinished = true;
+
+		if (timings.connect) {
+			onUpload();
+		}
+	});
+
+	request.once('response', response => {
+		timings.response = Date.now();
+		timings.phases.firstByte = timings.response - timings.upload;
+
+		handleError(response);
+
+		response.once('end', () => {
+			timings.end = Date.now();
+			timings.phases.download = timings.end - timings.response;
+			timings.phases.total = timings.end - timings.start;
+		});
+	});
+
+	return timings;
+};