thumbnailer:使用Minio的listenBucketNotification API的缩略图生成器示例

# Thumbnailer A thumbnail generator example using Minio's [listenBucketNotification API](http://docs.minio.io/docs/javascript-client-api-reference#listenBucketNotification). This is a simple example of how one can build a AWS Lambda like functionality on a laptop. ## Dependencies Dependencies are managed by [npm](https://npm.org) use `npm install`. ```sh npm install ``` ## Configure Please edit `config/development.json` with your local parameters, currently the example points to https://play.minio.io:9000 <blockquote>This example works only with Minio server using an extended API</blockquote> ## Run Once configured proceed to run. ```sh node thumbnail.js Listening for events on "images" ``` Now upload an image using `mc` ```sh mc cp ./toposort/graph.jpg play/images/ ./toposort/graph.jpg: 34.29 KB / 34.29 KB ┃▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓┃ 100.00% 386.91 KB/s 0s ``` You will see thumbnail being generated after uploading the image using `mc`. ```sh node thumbnail.js Listening for events on "images" Uploading new thumbail to "images-processed" Successfully generated "graph-thumbnail.jpg" with md5sum "ca78ee1cc48358b4dbd883a589523e54" ``` To validate if the thumbnail was created at destination bucket use `mc`. ```sh mc ls play/images-processed [2017-01-22 23:44:51 PST] 629B graph-thumbnail.jpg ```