Minio Service for the Moleculer framework

This Services provides actions for managing buckets and objects in an AWS S3 or Minio powered backend. It utilizes the file streaming capabilities of the moleculer framework

Features

The following List details which features are implemented

• Bucket Management (Create, Delete, List)
• Object Management (Put, List, Delete, Stat)
• Presigned URL Management (Generate presigned URLs and Post Policy signed URLs)

Roadmap

The following List details which features are yet to be implemented

• Caching
• Broadcasting Bucket Notification as moleculer events

Requirements

This service relies on Minio or a generic AWS S3 endpoint available. Make sure to configure the service properly in order to connect to your endpoint. Using Minio Gatewy capabilities, you can easily fan out to Azure and the like. This repository includes an example, which itself includes a docker-compose file connecting to an inlcuded minio backend.

Install

This package is available in the npm-registry. In order to use it simply install it with yarn (or npm):

yarn add moleculer-minio

Usage

To make use of this Service, simply require it and create a new service:

const fs = require("fs");
let { ServiceBroker } = require("moleculer");
let MinioService = require("moleculer-minio");

let broker = new ServiceBroker({ logger: console });

// Create a service
broker.createService({
    mixins: MinioService,
    settings: {
        // ... see settings for connectivity
    }
});

// Start server
broker.start()
    .then(() => broker.call('minio.makeBucket', {bucketName: 'my-bucket', region: 'us-east-1'}))
    .then(() => 
        broker.call(
            'minio.putObject', 
            fs.createReadStream('./archive.tar.gz'), 
            {
                meta: {
                    bucketName: 'my-bucket',
                    objectName: 'my-object.tar.gz',
                    metaData: {
                        foo: 'bar'
                    }
                }
            }
        ))
    .then(() =>
        broker.call('minio.presignedGetObject', {
            bucketName: 'my-bucket',
            objectName: 'my-object.tar.gz',
            expires: 600
        }))
    .then(console.log);

For a more indepth example checkout out the examples folder. It includes a docker-compose file, running docker-compose up will boot a broker with a minio service, a connected minio backend and an API Gateway to upload files to. This project includes a published postman collection enabling you to quickly explore the service in your local environment.

Settings

Property	Type	Default	Description
endPoint	String	required	The Hostname minio is running on and available at. Hostname or IP-Address
port	Number	required	TCP/IP port number minio is listening on. Default value set to 80 for HTTP and 443 for HTTPs.
useSSL	Boolean	null	If set to true, https is used instead of http. Default is true.
accessKey	String	required	The AccessKey to use when connecting to minio
secretKey	String	required	The SecretKey to use when connecting to minio
region	String	null	Set this value to override region cache
transport	String	null	Set this value to pass in a custom transport. (Optional)
sessionToken	String	null	Set this value to provide x-amz-security-token (AWS S3 specific). (Optional)
minioHealthCheckInterval	Number	null	This service will perform a periodic healthcheck of Minio. Use this setting to configure the inverval in which the healthcheck is performed. Set to 0 to turn healthcheks of

Actions

makeBucket

Creates a new Bucket

Parameters

Property	Type	Default	Description
bucketName	string	required	The name of the bucket
region	string	required	The region to create the bucket in. Defaults to "us-east-1"

Results

Type: PromiseLike.<(undefined|Error)>

listBuckets

Lists all buckets.

Parameters

Property	Type	Default	Description
No input parameters.

Results

Type: PromiseLike.<(Array.<Bucket>|Error)>

bucketExists

Checks if a bucket exists.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket

Results

Type: PromiseLike.<(boolean|Error)>

removeBucket

Removes a bucket.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket

Results

Type: PromiseLike.<(boolean|Error)>

listObjects

Lists all objects in a bucket.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket
prefix	string	required	The prefix of the objects that should be listed (optional, default '').
recursive	boolean	required	true indicates recursive style listing and false indicates directory style listing delimited by '/'. (optional, default false).

Results

Type: PromiseLike.<(Array.<Object>|Error)>

listObjectsV2

Lists all objects in a bucket using S3 listing objects V2 API

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket
prefix	string	required	The prefix of the objects that should be listed (optional, default '').
recursive	boolean	required	true indicates recursive style listing and false indicates directory style listing delimited by '/'. (optional, default false).
startAfter	string	required	Specifies the object name to start after when listing objects in a bucket. (optional, default '').

Results

Type: PromiseLike.<(Array.<Object>|Error)>

listIncompleteUploads

Lists partially uploaded objects in a bucket.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket
prefix	string	required	The prefix of the objects that should be listed (optional, default '').
recursive	boolean	required	true indicates recursive style listing and false indicates directory style listing delimited by '/'. (optional, default false).

Results

Type: PromiseLike.<(Array.<Object>|Error)>

getObject

Downloads an object as a stream.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket
objectName	string	required	Name of the object.

Results

Type: PromiseLike.<(ReadableStream|Error)>

getPartialObject

Downloads the specified range bytes of an object as a stream.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
offset	number	required	offset of the object from where the stream will start.
length	number	required	length of the object that will be read in the stream (optional, if not specified we read the rest of the file from the offset).

Results

Type: PromiseLike.<(ReadableStream|Error)>

fGetObject

Downloads and saves the object as a file in the local filesystem.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
filePath	string	required	Path on the local filesystem to which the object data will be written.

Results

Type: PromiseLike.<(undefined|Error)>

putObject

Uploads an object from a stream/Buffer.

Parameters

Property	Type	Default	Description
params	ReadableStream	required	Readable stream.
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
size	number	required	Size of the object (optional).
metaData	object	required	metaData of the object (optional).

Results

Type: PromiseLike.<(undefined|Error)>

fPutObject

Uploads contents from a file to objectName.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
filePath	string	required	Path of the file to be uploaded.
metaData	object	required	metaData of the object (optional).

Results

Type: PromiseLike.<(undefined|Error)>

copyObject

Copy a source object into a new object in the specified bucket.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
sourceObject	string	required	Path of the file to be copied.
conditions	object	required	Conditions to be satisfied before allowing object copy.
metaData	object	required	metaData of the object (optional).

Results

Type: PromiseLike.<({etag: {string}, lastModified: {string}}|Error)>

statObject

Gets metadata of an object.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.

Results

Type: PromiseLike.<({size: {number}, metaData: {object}, lastModified: {string}, etag: {string}}|Error)>

removeObject

Removes an Object

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.

Results

Type: PromiseLike.<(undefined|Error)>

removeObjects

Removes a list of Objects

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectNames	Array.<string>	required	Names of the objects.

Results

Type: PromiseLike.<(undefined|Error)>

removeIncompleteUpload

Removes a partially uploaded object.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.

Results

Type: PromiseLike.<(undefined|Error)>

presignedUrl

Generates a presigned URL for the provided HTTP method, 'httpMethod'. Browsers/Mobile clients may point to this URL to directly download objects even if the bucket is private. This presigned URL can have an associated expiration time in seconds after which the URL is no longer valid. The default value is 7 days.

Parameters

Property	Type	Default	Description
httpMethod	string	required	The HTTP-Method (eg. GET).
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
expires	number	required	Expiry time in seconds. Default value is 7 days. (optional)
reqParams	object	required	request parameters. (optional)
requestDate	string	required	An ISO date string, the url will be issued at. Default value is now. (optional)

Results

Type: PromiseLike.<(String|Error)>

presignedGetObject

Generates a presigned URL for HTTP GET operations. Browsers/Mobile clients may point to this URL to directly download objects even if the bucket is private. This presigned URL can have an associated expiration time in seconds after which the URL is no longer valid. The default value is 7 days.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
expires	number	required	Expiry time in seconds. Default value is 7 days. (optional)
reqParams	object	required	request parameters. (optional)
requestDate	string	required	An ISO date string, the url will be issued at. Default value is now. (optional)

Results

Type: PromiseLike.<(String|Error)>

presignedPutObject

Generates a presigned URL for HTTP PUT operations. Browsers/Mobile clients may point to this URL to upload objects directly to a bucket even if it is private. This presigned URL can have an associated expiration time in seconds after which the URL is no longer valid. The default value is 7 days.

Parameters

Property	Type	Default	Description
bucketName	string	required	Name of the bucket.
objectName	string	required	Name of the object.
expires	number	required	Expiry time in seconds. Default value is 7 days. (optional)

Results

Type: PromiseLike.<(String|Error)>

presignedPostPolicy

Allows setting policy conditions to a presigned URL for POST operations. Policies such as bucket name to receive object uploads, key name prefixes, expiry policy may be set.

Parameters

Property	Type	Default	Description
policy	object	required	Policy object created by minioClient.newPostPolicy()

Results

Type: PromiseLike.<({postURL: {string}, formData: {object}}|Error)>

Methods

createMinioClient

Creates and returns a new Minio client

Parameters

Property	Type	Default	Description
No input parameters.

Results

Type: Client

Test

$ docker-compose exec package yarn test

In development with watching

$ docker-compose up

License

moleculer-minio is available under the MIT license.