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https://github.com/PabloSichert/concurrency-logger

Log HTTP requests/responses separately, visualize their concurrency and report logs/errors in context of a request.
https://github.com/PabloSichert/concurrency-logger

concurrency http koa logger logging middleware request

Last synced: about 1 month ago
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Log HTTP requests/responses separately, visualize their concurrency and report logs/errors in context of a request.

Host: GitHub
URL: https://github.com/PabloSichert/concurrency-logger
Owner: pablosichert
License: mit
Created: 2016-10-24T20:28:11.000Z (almost 8 years ago)
Default Branch: master
Last Pushed: 2018-03-08T20:36:54.000Z (over 6 years ago)
Last Synced: 2024-07-19T12:36:45.873Z (about 2 months ago)
Topics: concurrency, http, koa, logger, logging, middleware, request
Language: JavaScript
Homepage: https://pablosichert.github.io/concurrency-logger/
Size: 441 KB
Stars: 393
Watchers: 8
Forks: 8
Open Issues: 2
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

awesome-koa - concurrency-logger - 分别记录 HTTP 请求/响应，将它们的并发可视化并在请求的上下文中报告日志/错误。 ![](https://img.shields.io/github/stars/PabloSichert/concurrency-logger.svg?style=social&label=Star) ![](https://img.shields.io/npm/dm/concurrency-logger.svg?style=flat-square) (仓库 / 中间件)

README

        # concurrency-logger

[![NPM version][npm-image]][npm-url]

[![Build status][travis-image]][travis-url]

[![Coverage status][coveralls-image]][coveralls-url]

[![Dependency status][david-dm-image]][david-dm-url]

[![Dev dependency status][david-dm-dev-image]][david-dm-dev-url]

HTTP logging middleware especially useful to unwind concurrent operations without losing the request context



    


        

        


        Launch demo in your browser

    




## Install

```

$ npm install concurrency-logger

```

## Usage

### With [koa](https://github.com/koajs/koa)

#### Basic usage

```js

import Koa from 'koa';

import createLogger from 'concurrency-logger';

const app = new Koa;

// Logger is stateful as it contains information about concurrent requests

// Same instance needs to be reused across requests

const logger = createLogger(/* options */);

app.use(logger);

```

#### Log from middleware

```js

// Log something in context to a specific request to trace it back easily -

// also when there are multiple concurrent requests

app.use(async (context, next) => {

    context.log('Log!');

    context.log.info('Info!');

    context.log.error('Error!');

    await next();

});

```

#### Attach more [context](https://github.com/koajs/koa/blob/master/docs/api/context.md#request-aliases) to the log

```js

const logger = createLogger({

    req: context => (

        context.originalUrl + '\n' +

        context.get('User-Agent')

    )

});

```

#### Include localized timestamps

```js

const logger = createLogger({

    timestamp: true

});

```

#### Write log to file

```js

import { createWriteStream } from 'fs';

// To read log use program that interprets ANSI escape codes,

// e.g. cat or less -r

const log = createWriteStream('logs/requests.log');

const logger = createLogger({

    reporter: log

});

```

#### Adjust alert levels per method and response time

```js

const logger = createLogger({

    getLevel: (responseTime, context) => {

        /*

            GET

              0 -  99ms: 0

            100 - 149ms: 1

            150 - 199ms: 2

            200 - 249ms: 3

            250 - 299ms: 4

            300 - 349ms: 5

            > 350ms    : 6

            POST

              0 - 149ms: 0

            150 - 225ms: 1

                   ... : ...

        */

        let threshold = 50; // ms

        if (['POST', 'PUT'].includes(context.method)) {

            threshold *= 1.5;

        }

        return Math.floor(responseTime / threshold) - 1;

    }

});

```

### Standalone

```js

import createLogger from 'concurrency-logger';

const logger = createLogger(/* options */);

(async () => {

    const context = {

        method: 'GET',

        originalUrl: '/'

    };

    const next = async () => {

        await new Promise(resolve => setTimeout(resolve, 100));

        context.status = 200;

    };

    try {

        await logger(context, next);

    } catch (error) {

        // Errors are passed through

    }

})();

```

## API

| Option | Type | Default | Description | Example |

| ---- | ---- | ------- | ----------- | ------- |

| minSlots | integer | `1` | Amount of space that is provisioned to display concurrent request lanes. Number of lanes will automatically scale up as the number of concurrent requests grow. | `3`

| getLevel | integer: function(responseTime: integer) | `responseTime => Math.floor(responseTime / 50) - 1` | Map response time to alert level. Alert levels go from 0 (default color) to 6 (dark red). By default that means `<100ms: 0`, `<150ms: 1` `<200ms: 2`, ..., `>=350ms: 6`. | `responseTime => Math.floor(responseTime / 100)`

| width | integer, boolean(`false`) | `undefined` | If no width is provided, it will be dynamically read from `process.stdout.columns`. Pass in an integer to break all lines according to the specified fixed (terminal character) width. Pass in `false` if you want the lines not to break at all. | `80`, `132`, `false`

| timestamp | boolean | `false` | Print localized timestamp for every requests. | `true`, `false`

| slim | boolean | `false` | "Slim mode": don't use an extra character between request lanes to shrink width, but make them harder to separate visually. | `true`, `false`

| reporter | writable stream | `process.stdout` | Specify a stream that handles the output lines. Write to terminal or stream to a log file, for example. Note that the lines contain ANSI color codes, so when streaming to a file you might need a program that can read those. E.g. `less -r requests.log` | `require('fs').createWriteStream('logs/requests.log')`

| req | any: function(context: object) | `context => context.originalUrl` | Attach additional information to the request log line. | `context => context.originalUrl + '\n' + context.get('User-Agent')`

| res | any: function(context: object) | `context => context.originalUrl` | Attach additional information to the response log line. | `context => context.originalUrl + '\n' + context.get('User-Agent')`

## Developing

Install development dependencies

```

$ npm install

```

Create new fixtures to test against

```

$ npm run create-fixtures

```

Manually review fixtures (you need a program that renders ANSI escape codes)

```

$ less -r test/fixtures/*

```

Run tests

```

$ npm test

```

Run code linter

```

$ npm run lint

```

Compile to ES5 from /src to /lib

```

$ npm run compile

```

Initialize demo project

```

$ git clone [email protected]:PabloSichert/concurrency-logger demo

$ cd demo

demo $ git checkout gh-pages

demo $ npm install

```

Build demo

```

demo $ npm run compile

```

[npm-url]: https://npmjs.org/package/concurrency-logger

[npm-image]: https://badge.fury.io/js/concurrency-logger.svg

[travis-url]: https://travis-ci.org/PabloSichert/concurrency-logger?branch=master

[travis-image]: https://travis-ci.org/PabloSichert/concurrency-logger.svg?branch=master

[coveralls-url]:https://coveralls.io/r/PabloSichert/concurrency-logger?branch=master

[coveralls-image]:https://coveralls.io/repos/PabloSichert/concurrency-logger/badge.svg?branch=master

[david-dm-url]:https://david-dm.org/PabloSichert/concurrency-logger

[david-dm-image]:https://david-dm.org/PabloSichert/concurrency-logger.svg

[david-dm-dev-url]:https://david-dm.org/PabloSichert/concurrency-logger#info=devDependencies

[david-dm-dev-image]:https://david-dm.org/PabloSichert/concurrency-logger/dev-status.svg