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MIT License
Copyright (c) 2018 Szymon Marczak
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# http-timer
> Timings for HTTP requests
[![Build Status](https://travis-ci.org/szmarczak/http-timer.svg?branch=master)](https://travis-ci.org/szmarczak/http-timer)
[![Coverage Status](https://coveralls.io/repos/github/szmarczak/http-timer/badge.svg?branch=master)](https://coveralls.io/github/szmarczak/http-timer?branch=master)
[![install size](https://packagephobia.now.sh/badge?p=@szmarczak/http-timer)](https://packagephobia.now.sh/result?p=@szmarczak/http-timer)
Inspired by the [`request` package](https://github.com/request/request).
## Installation
NPM:
> `npm install @szmarczak/http-timer`
Yarn:
> `yarn add @szmarczak/http-timer`
## Usage
**Note:**
> - The measured events resemble Node.js events, not the kernel ones.
> - Sending a chunk greater than [`highWaterMark`](https://nodejs.org/api/stream.html#stream_new_stream_writable_options) will result in invalid `upload` and `response` timings. You can avoid this by splitting the payload into smaller chunks.
```js
import https from 'https';
import timer from '@szmarczak/http-timer';
const request = https.get('https://httpbin.org/anything');
timer(request);
request.once('response', response => {
response.resume();
response.once('end', () => {
console.log(response.timings); // You can use `request.timings` as well
});
});
// {
// start: 1572712180361,
// socket: 1572712180362,
// lookup: 1572712180415,
// connect: 1572712180571,
// upload: 1572712180884,
// response: 1572712181037,
// end: 1572712181039,
// error: undefined,
// abort: undefined,
// phases: {
// wait: 1,
// dns: 53,
// tcp: 156,
// request: 313,
// firstByte: 153,
// download: 2,
// total: 678
// }
// }
```
## API
### timer(request)
Returns: `Object`
**Note**: The time is a `number` representing the milliseconds elapsed since the UNIX epoch.
- `start` - Time when the request started.
- `socket` - Time when a socket was assigned to the request.
- `lookup` - Time when the DNS lookup finished.
- `connect` - Time when the socket successfully connected.
- `secureConnect` - Time when the socket securely connected.
- `upload` - Time when the request finished uploading.
- `response` - Time when the request fired `response` event.
- `end` - Time when the response fired `end` event.
- `error` - Time when the request fired `error` event.
- `abort` - Time when the request fired `abort` event.
- `phases`
- `wait` - `timings.socket - timings.start`
- `dns` - `timings.lookup - timings.socket`
- `tcp` - `timings.connect - timings.lookup`
- `tls` - `timings.secureConnect - timings.connect`
- `request` - `timings.upload - (timings.secureConnect || timings.connect)`
- `firstByte` - `timings.response - timings.upload`
- `download` - `timings.end - timings.response`
- `total` - `(timings.end || timings.error || timings.abort) - timings.start`
If something has not been measured yet, it will be `undefined`.
## License
MIT

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/// <reference types="node" />
import type { ClientRequest, IncomingMessage } from 'http';
export interface Timings {
start: number;
socket?: number;
lookup?: number;
connect?: number;
secureConnect?: number;
upload?: number;
response?: number;
end?: number;
error?: number;
abort?: number;
phases: {
wait?: number;
dns?: number;
tcp?: number;
tls?: number;
request?: number;
firstByte?: number;
download?: number;
total?: number;
};
}
export interface ClientRequestWithTimings extends ClientRequest {
timings?: Timings;
}
export interface IncomingMessageWithTimings extends IncomingMessage {
timings?: Timings;
}
declare const timer: (request: ClientRequestWithTimings) => Timings;
export default timer;

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import { errorMonitor } from 'events';
import { types } from 'util';
import deferToConnect from 'defer-to-connect';
const timer = (request) => {
if (request.timings) {
return request.timings;
}
const timings = {
start: Date.now(),
socket: undefined,
lookup: undefined,
connect: undefined,
secureConnect: undefined,
upload: undefined,
response: undefined,
end: undefined,
error: undefined,
abort: undefined,
phases: {
wait: undefined,
dns: undefined,
tcp: undefined,
tls: undefined,
request: undefined,
firstByte: undefined,
download: undefined,
total: undefined,
},
};
request.timings = timings;
const handleError = (origin) => {
origin.once(errorMonitor, () => {
timings.error = Date.now();
timings.phases.total = timings.error - timings.start;
});
};
handleError(request);
const onAbort = () => {
timings.abort = Date.now();
timings.phases.total = timings.abort - timings.start;
};
request.prependOnceListener('abort', onAbort);
const onSocket = (socket) => {
timings.socket = Date.now();
timings.phases.wait = timings.socket - timings.start;
if (types.isProxy(socket)) {
return;
}
const lookupListener = () => {
timings.lookup = Date.now();
timings.phases.dns = timings.lookup - timings.socket;
};
socket.prependOnceListener('lookup', lookupListener);
deferToConnect(socket, {
connect: () => {
timings.connect = Date.now();
if (timings.lookup === undefined) {
socket.removeListener('lookup', lookupListener);
timings.lookup = timings.connect;
timings.phases.dns = timings.lookup - timings.socket;
}
timings.phases.tcp = timings.connect - timings.lookup;
},
secureConnect: () => {
timings.secureConnect = Date.now();
timings.phases.tls = timings.secureConnect - timings.connect;
},
});
};
if (request.socket) {
onSocket(request.socket);
}
else {
request.prependOnceListener('socket', onSocket);
}
const onUpload = () => {
timings.upload = Date.now();
timings.phases.request = timings.upload - (timings.secureConnect ?? timings.connect);
};
if (request.writableFinished) {
onUpload();
}
else {
request.prependOnceListener('finish', onUpload);
}
request.prependOnceListener('response', (response) => {
timings.response = Date.now();
timings.phases.firstByte = timings.response - timings.upload;
response.timings = timings;
handleError(response);
response.prependOnceListener('end', () => {
request.off('abort', onAbort);
response.off('aborted', onAbort);
if (timings.phases.total) {
// Aborted or errored
return;
}
timings.end = Date.now();
timings.phases.download = timings.end - timings.response;
timings.phases.total = timings.end - timings.start;
});
response.prependOnceListener('aborted', onAbort);
});
return timings;
};
export default timer;

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{
"name": "@szmarczak/http-timer",
"version": "5.0.1",
"description": "Timings for HTTP requests",
"type": "module",
"exports": "./dist/source/index.js",
"engines": {
"node": ">=14.16"
},
"scripts": {
"test": "xo && ava",
"build": "del-cli dist && tsc",
"prepare": "npm run build",
"coveralls": "exit 0 && nyc report --reporter=text-lcov | coveralls"
},
"files": [
"dist/source"
],
"keywords": [
"http",
"https",
"http2",
"timer",
"timings",
"performance",
"measure"
],
"repository": {
"type": "git",
"url": "git+https://github.com/szmarczak/http-timer.git"
},
"author": "Szymon Marczak",
"license": "MIT",
"bugs": {
"url": "https://github.com/szmarczak/http-timer/issues"
},
"homepage": "https://github.com/szmarczak/http-timer#readme",
"dependencies": {
"defer-to-connect": "^2.0.1"
},
"devDependencies": {
"@ava/typescript": "^2.0.0",
"@sindresorhus/tsconfig": "^1.0.2",
"@types/node": "^16.7.0",
"ava": "^3.15.0",
"coveralls": "^3.1.1",
"del-cli": "^4.0.1",
"http2-wrapper": "^2.1.4",
"nyc": "^15.1.0",
"p-event": "^4.2.0",
"ts-node": "^10.2.1",
"typescript": "^4.3.5",
"xo": "^0.44.0"
},
"types": "dist/source",
"nyc": {
"extension": [
".ts"
],
"exclude": [
"**/tests/**"
]
},
"xo": {
"rules": {
"@typescript-eslint/no-non-null-assertion": "off",
"@typescript-eslint/no-unsafe-assignment": "off",
"@typescript-eslint/no-unsafe-member-access": "off",
"@typescript-eslint/no-unsafe-call": "off",
"unicorn/prefer-node-protocol": "off"
}
},
"ava": {
"files": [
"tests/*"
],
"timeout": "1m",
"nonSemVerExperiments": {
"nextGenConfig": true,
"configurableModuleFormat": true
},
"extensions": {
"ts": "module"
},
"nodeArguments": [
"--loader=ts-node/esm"
]
}
}