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Tiny node client for distributed Openstack Swift Object Storage

Highlight

  • 🚀 Vanilla JS + Only 2 dependencies simple-get for HTTP requests and aws4 for signing S3 requests.
  • 🌎 Provide one or a list of storages credentials: the SDK will switch storage if something goes wrong (Server/DNS not responding, timeout, error 500, too many redirection, authentication error, and more...). As soon as the main storage is available, the SDK returns to the main storage
  • ✨ If a request fails due to an authentication token expiration, the SDK fetches a new authentication token and retry the initial request with it (Concerns only Swift Storage).
  • 🚩 When initialising the Tiny SDK client, provide only a list of S3 or a list of Swift credentials, switching from one storage system to another is not supported.
  • ✅ Production battle-tested against hundreds of GBs of file uploads & downloads

Install

1. Prior installing

you need a minimum of one object storage container, or you can synchronize Object Storages containers in order to access same objects if a fallback occur:

  • Sync 2 containers: 1 <=> 2. They would both need to share the same secret synchronization key.
  • You can also set up a chain of synced containers if you want more than two. You would point 1 -> 2, then 2 -> 3, and finally 3 -> 1 for three containers. They would all need to share the same secret synchronization key. Learn more on the OpenStack documentation or on the OVHCloud documentation.
Quick tutorial to synchronise 1 container into another with OVHCloud Object Storage (1 -> 2 one way sync)
  1. Install the swift-pythonclient, an easy way to access Storages is with the Swift command line client, run on your terminal:
$ pip install python-swiftclient
  1. Download the OpenStack RC file on the OVH account to change environment variables. Tab Public Cloud > Users & Roles > Pick the user and “Download OpenStack’s RC file”
  2. Open a terminal, load the contents of the file into the current environment:
$ source openrc.sh
  1. In order for the containers to identify themselves, a key must be created and then configured on each container:
$ sharedKey=$(openssl rand -base64 32)
  1. See which region you are connected to:
env | grep OS_REGION
  1. Retrieve the Account ID AUTH_xxxxxxx of the destination container in order to configure the source container:
destContainer=$(swift --debug stat containerBHS 2>&1 | grep 'curl -i.*storage' | awk '{ print $4 }') && echo $destContainer
  1. Change to the source region:
OS_REGION_NAME=RegionSource
  1. Upload the key and the destination sync url to the source container:
$ swift post -t ‘//OVH_PUBLIC_CLOUD/RegionDestination/AUTH_xxxxxxxxx/containerNameDestination’ -k "$sharedKey" containerNameSource
  1. You can check that this has been configured by using the following command:
$ swift stat containerName
  1. You can check if the synchronization worked by listing the files in each of the containers:
$ OS_REGION_NAME=RegionSource && swift list containerName
$ OS_REGION_NAME=RegionDestination && swift list containerName

2. Install the package with your package manager:

$ npm install --save tiny-storage-client
// or
$ yarn add tiny-storage-client

API Usage

Connection

Initialise the SDK with one or multiple storage, if something goes wrong, the next region will take over automatically. If any storage is available, an error message is returned Error: Object Storages are not available.

const storageClient = require('tiny-storage-client');

let storage = storageClient([{
  authUrl    : 'https://auth.cloud.ovh.net/v3', // REQUIRED
  username   : 'username-1',                    // REQUIRED
  password   : 'password-1',                    // REQUIRED
  region     : 'region-1',                      // REQUIRED
  tenantName : 'tenantName-1'                   // OPTIONAL
},
{
  authUrl    : 'https://auth.cloud.ovh.net/v3',
  username   : 'username-2',
  password   : 'password-2',
  region     : 'region-2'
}]);

storage.connection((err) => {
  if (err) {
    // Invalid credentials
  }
  // Success, connected!
})

Upload a file

const path = require(path);

/** SOLUTION 1: The file content can be passed by giving the file absolute path **/
storage.uploadFile('container', 'filename.jpg', path.join(__dirname, './assets/file.txt'), (err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

/** SOLUTION 2: A Buffer can be passed for the file content **/
storage.uploadFile('container', 'filename.jpg', Buffer.from("File content"), (err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

/** SOLUTION 3: Pass a function returning a ReadStream **/
storage.uploadFile('container', 'filename.jpg', () => fs.createReadStream(path.join(__dirname, './assets/file.txt')), (err, resp) => {
  if (err) {
    // handle error
  }
    /** 
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

/** SOLUTION 4: the function accepts a optionnal fourth argument `option` including query parameters and headers. List of query parameters and headers: https://docs.openstack.org/api-ref/object-store/?expanded=create-or-replace-object-detail#create-or-replace-object **/
storage.uploadFile('container', 'filename.jpg', Buffer.from("File content"), { queries: { temp_url_expires: '1440619048' }, headers: { 'X-Object-Meta-LocationOrigin': 'Paris/France' }}, (err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

Download a file

/** Solution 1: Download the file as Buffer **/
storage.downloadFile('containerName', 'filename.jpg', (err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body => the content of the file as a Buffer
   **/
});

/** Solution 2: Download the file as Stream,  set the option `output` with a function returning the output Stream */
function createOutputStream(opts, res) {
  const writer = fs.createWriteStream('2023-invoice.pdf')
  writer.on('error', (e) => { /* clean up your stuff */ })
  return writer
}

storage.downloadFile('containerName', '2023-invoice.pdf', { output: createOutputStream }, (err, resp) => {
  if (err) {
    return console.log("Error on download: ", err);
  }
  /**
   * Request reponse:
   * - resp.headers
   * - resp.statusCode
   *
   * When the callback is called, the stream is closed and the file created,
   * you don't have to pipe yourself!
   */
})

Delete a file

storage.deleteFile('templates', 'filename.jpg', (err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

List objects from a container

/**
 * SOLUTION 1
 **/
storage.listFiles('templates', function (err, resp) {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body => List of objects as an Array, example:
   * [
   *    {
   *      "bytes": 47560,
   *      "last_modified": "2020-12-03T10:14:40.049830",
   *      "hash": "bd3593e317e71fd9992405f29475afd4",
   *      "name": "invoice.pdf",
   *      "content_type": "application/pdf"
   *    }
   * ]
   **/
});

/**
 * SOLUTION 2
 * Possible to pass queries and overwrite request headers, list of options: https://docs.openstack.org/api-ref/object-store/? expanded=show-container-details-and-list-objects-detail#show-container-details-and-list-objects
 **/
storage.listFiles('templates', { queries: { prefix: 'prefixName' }, headers: { Accept: 'application/xml' } }, function (err, resp) {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

Get file metadata

Shows object metadata. Checkout the list of headers.

storage.getFileMetadata('templates', 'filename.jpg', (err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/

  /**
   * Returned headers `resp.headers`: {
   *  Content-Length: 14
   *  Accept-Ranges: bytes
   *  Last-Modified: Thu, 16 Jan 2014 21:12:31 GMT
   *  Etag: 451e372e48e0f6b1114fa0724aa79fa1
   *  X-Timestamp: 1389906751.73463
   *  X-Object-Meta-Book: GoodbyeColumbus
   *  Content-Type: application/octet-stream
   *  X-Trans-Id: tx37ea34dcd1ed48ca9bc7d-0052d84b6f
   *  X-Openstack-Request-Id: tx37ea34dcd1ed48ca9bc7d-0052d84b6f
   *  Date: Thu, 16 Jan 2014 21:13:19 GMT
   *  X-Object-Meta-Custom-Metadata-1: Value
   *  X-Object-Meta-Custom-Metadata-2: Value
   * }
   * 
   * Related documentation: https://docs.openstack.org/api-ref/object-store/?expanded=show-object-metadata-detail#show-object-metadata
   */
});

Set file metadata

To create or update custom metadata, use the "X-Object-Meta-name" header, where name is the name of the metadata item. The function overwrite all custom metadata applied on the file. Checkout the list of headers availables.

storage.setFileMetadata('templates', 'filename.jpg', { headers: { 'Content-Type': 'image/jpeg', 'X-Object-Meta-LocationOrigin': 'Paris/France', 'X-Delete-At': 1440619048 }} (err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

Delete files

Bulk delete files (Maximum 10 000 objects per requests).

const filesToDelete = [ { name: '1685696359848.jpg' }, { name: 'template-column.docx' }, { name: 'test file |1234.odt' } ]

swift.deleteFiles('', filesToDelete, function(err, resp) {
  if (err) {
    // handle error
  }
 /**
   * Request reponse:
   * - resp.headers
   * - resp.statusCode
   * - resp.body => body as Object, example: {"Response Status":"200 OK","Response Body":"","Number Deleted":3,"Number Not Found":0,"Errors":[]}
   **/
})

Head Bucket

Shows container metadata, including the number of objects and the total bytes of all objects stored in the container.

storage.headBucket('templates', (err, resp) => {
  if (err) {
    // handle error
  }
   /**
   * Request reponse:
   * - resp.headers
   * - resp.statusCode
   * - resp.body
   **/
});

List Buckets

Shows details for an account and lists containers, sorted by name, in the account.

storage.listBuckets((err, resp) => {
  if (err) {
    // handle error
  }
  /**
   * Request reponse:
   * - resp.headers
   * - resp.statusCode
   * - resp.body > The response body returns a list of containers as an Array, example: 
   * [
   *     {
   *      name: 'container1',
   *      count: 55,
   *      bytes: 106522,
   *      last_modified: '2022-01-12T14:02:33.672010'
   *    }
   * ]
   **/
})

Custom request

The request function can be used to request the object storage with custom options. Prototype to get the data as Buffer:

request(method, path, { headers, queries, body }, (err, body, headers) => {}).

Prototype to get the data as Stream Set the option output with a function returning the output Stream. When the callback is called, the stream is closed and the file created.

function createOutputStream(opts, res) {
  const writer = fs.createWriteStream('file.pdf')
  writer.on('error', (e) => { /* clean up your stuff */ })
  return writer
}

request(method, path, { headers, queries, body, output: createOutputStream }, (err) => {})`.

The base URL requests by default the account, passing an empty string will request the account details. For container requests, pass the container name, such as: /{container}. For file requests, pass the container and the file, such as: /{container}/{filename}. Object Storage Swift API specification: https://docs.openstack.org/api-ref/object-store/

The request function automatically reconnects to the Object Storage or switch storage if something goes wrong.

Example of custom request, bulk delete file from a customerDocuments container:

  const _headers = {
    'Content-Type': 'text/plain',
    'Accept'      : 'application/json'
  }

 storage.request('POST', '/customerDocuments?bulk-delete', { headers: _headers, body: 'file1\nfile2\n' }, (err, resp) => {
  /**
   * Response details:
   * - resp.headers
   * - resp.statusCode
   * - resp.body => body as Javascript Object, example: {"Response Status":"200 OK","Response Body":"","Number Deleted":3,"Number Not Found":0,"Errors":[]}
   **/
});

Logs

By default, logs are printed with to console.log. You can use the setLogFunction to override the default log function. Create a function with two arguments: message as a string, level as a string and the value can be: info/warning/error. Example to use:

storage.setLogFunction((message, level) => {
  console.log(`${level} : ${message}`);
})

Timeout

The default request timeout is 5 seconds, change it by calling setTimeout:

storage.setTimeout(30000); // 30 seconds

Container Alias

To simplify requests to custom named containers into different SWIFT providers, it is possible to create aliases by providing a buckets object on credentials. When calling a function, define the bucket alias as first argument, it will request the current active storage automatically.

const storageClient = require('')

const swift = storageClient([
  /** SWIFT Storage 1 **/
  {
    username                     : '',
    password                     : '',
    authUrl                      : '',
    region                       : '',
    buckets                      : {
      invoices: "invoices-ovh-gra",
      www     : "www-ovh-gra"
    }
  },
  /** SWIFT Storage 2 **/
  {
    username                     : '',
    password                     : '',
    authUrl                      : '',
    region                       : '',
    buckets                      : {
      invoices: "invoices-aws-paris",
      www     : "www-aws-paris"
    }
  }
])

/**
 * On the following example, "downloadFile" will request the main storage "invoices-ovh-gra"
 * or the backup "invoices-aws-paris" if something goes wrong.
 */
swift.downloadFile('invoices', '2023-invoice.pdf', (err, resp) => {
  if (err) {
    return console.log("Error on download: ", err);
  }
  /**
   * Request reponse:
   * - resp.body => downloaded file as Buffer
   * - resp.headers
   * - resp.statusCode
   */
})