https://github.com/dimapaloskin/micro-chain

🤝 Helps to build chains from your micro services.
https://github.com/dimapaloskin/micro-chain

async await javascript micro microservice microservices node

Last synced: 3 months ago
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🤝 Helps to build chains from your micro services.

• Host: GitHub
• URL: https://github.com/dimapaloskin/micro-chain
• Owner: dimapaloskin
• Created: 2017-03-11T09:07:47.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2020-06-03T09:18:47.000Z (over 4 years ago)
• Last Synced: 2024-10-08T16:17:07.179Z (4 months ago)
• Topics: async, await, javascript, micro, microservice, microservices, node
• Language: JavaScript
• Homepage:
• Size: 3.29 MB
• Stars: 24
• Watchers: 3
• Forks: 2
• Open Issues: 10
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-micro - micro-chain - Builds flexible requests chains and pass them into micro handler. (Modules / Utilities)

README

        
# micro-chain 

> Helps to build chains from your [micro](https://github.com/zeit/micro/) services.

[![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/sindresorhus/xo)

[![Build Status](https://travis-ci.org/dimapaloskin/micro-chain.svg?branch=master)](https://travis-ci.org/dimapaloskin/micro-chain)

[![Greenkeeper badge](https://badges.greenkeeper.io/dimapaloskin/micro-chain.svg)](https://greenkeeper.io/)

### Overview

Module provides simple ability to build chains like:

```

first.api.your-domain.com

  -> second.api.your-domain.com

    -> third.api.your-domain.com

      -> final.api.your-domain.com

```

### Install

```bash

npm install --save micro-chain

```

### Example

**index.js**

```js

  const chain = require('micro-chain');

  

  const options = {

    micro: 'app.js', // or just your micro async function required before

    location: /\/some-path$/, // optional. chain will be executed only if request url matched

    chain: [{

      target: 'account.api.your-domain.com',

      mergeJson: true // response json will be merged with

                      // request json and will be passed down the chain

     }, {

      target: 'storage.api.your-domain.com/s3/save',

      mergeJson: true,

      allowedStatuses: [200, 201], // array of allowed statuses. 

                                   // request will rejected if target's response has not included status

                                   // rejected response will be equal target's response

      // transformRequestBody will modify request data and return result if declared

      // receive Buffer

      transformRequestBody: body => {

        if (!body || !body.length) return body;

        body = JSON.parse(body);

        delete body.secret;

        return body;

      },

      // transformReponseBody will modify response body if declared

      // receive Buffer

      transformReponseBody: body => {

        if (!body || !body.length) return body;

        body = JSON.parse(body);

        body.newProp = true;

        delete body.token;

        return body;

      }

     }, {

       // if host is not declared will extract host from original request

       target: '/notify'

     }, {

       target: 'some-stuff.api.your-domain.com',

       sendOriginalBody: true // modifed body passed down the chain.

                              // use this option if you want send original data

     }]

  };

  

  module.exports = chain(options);

```

Run:

```bash

micro index.js

```

### See in action

Clone this repo

Install dependencies

```bash

npm install

```

Build project

```bash

npm run build

```

Run `npm start`

Make POST request

```bash

curl http://localhost:3000/public -XPOST -d '{"what": "you want", "message": "ping"}'

```

### Author

[Dmitry Pavlovsky](http://palosk.in)