@mattersmedia/gcs-resumable-upload

gcs-resumable-upload

Upload a file to Google Cloud Storage with built-in resumable behavior

$ npm install --save gcs-resumable-upload

var upload = require('gcs-resumable-upload');
var fs = require('fs');

fs.createReadStream('titanic.mov')
  .pipe(upload({ bucket: 'legally-owned-movies', file: 'titanic.mov' }))
  .on('finish', function () {
    // Uploaded!
  });

Or from the command line:

$ npm install -g gcs-resumable-upload
$ cat titanic.mov | gcs-upload legally-owned-movies titanic.mov

If somewhere during the operation, you lose your connection to the internet or your tough-guy brother slammed your laptop shut when he saw what you were uploading, the next time you try to upload to that file, it will resume automatically from where you left off.

How it works

This module stores a file using ConfigStore that is written to when you first start an upload. It is aliased by the file name you are uploading to and holds the first 16kb chunk of data* as well as the unique resumable upload URI. (Resumable uploads are complicated)

If your upload was interrupted, next time you run the code, we ask the API how much data it has already, then simply dump all of the data coming through the pipe that it already has.

After the upload completes, the entry in the config file is removed. Done!

* The first 16kb chunk is stored to validate if you are sending the same data when you resume the upload. If not, a new resumable upload is started with the new data.

Authentication

Oh, right. This module uses google-auto-auth and accepts all of the configuration that module does to strike up a connection as config.authConfig. See authConfig.

API

upload = require('gcs-resumable-upload')

---

upload(config)

• Returns: Duplexify

config

• Type: object

Configuration object.

config.authClient

• Type: GoogleAutoAuth
• Optional

If you want to re-use an auth client from google-auto-auth, pass an instance here.

config.authConfig

• Type: object
• Optional

See authConfig.

config.bucket

• Type: string
• Required

The name of the destination bucket.

config.file

• Type: string
• Required

The name of the destination file.

config.generation

• Type: number
• Optional

This will cause the upload to fail if the current generation of the remote object does not match the one provided here.

config.key

• Type: string|buffer
• Optional

A customer-supplied encryption key.

config.metadata

• Type: object
• Optional

Any metadata you wish to set on the object.

config.metadata.contentLength

Set the length of the file being uploaded.

config.metadata.contentType

Set the content type of the incoming data.

config.offset

• Type: number
• Optional

The starting byte of the upload stream, for resuming an interrupted upload.

config.origin

• Type: string
• Optional

Set an Origin header when creating the resumable upload URI.

config.predefinedAcl

• Type: string
• Optional

Apply a predefined set of access controls to the created file.

Acceptable values are:

• authenticatedRead - Object owner gets OWNER access, and allAuthenticatedUsers get READER access.
• bucketOwnerFullControl - Object owner gets OWNER access, and project team owners get OWNER access.
• bucketOwnerRead - Object owner gets OWNER access, and project team owners get READER access.
• private - Object owner gets OWNER access.
• projectPrivate - Object owner gets OWNER access, and project team members get access according to their roles.
• publicRead - Object owner gets OWNER access, and allUsers get READER access.

config.private

• Type: boolean
• Optional

Make the uploaded file private. (Alias for config.predefinedAcl = 'private')

config.public

• Type: boolean
• Optional

Make the uploaded file public. (Alias for config.predefinedAcl = 'publicRead')

config.uri

• Type: string
• Optional

If you already have a resumable URI from a previously-created resumable upload, just pass it in here and we'll use that.

config.userProject

• Type: string
• Optional

If the bucket being accessed has requesterPays functionality enabled, this can be set to control which project is billed for the access of this file.

--

Events

.on('error', function (err) {})

err

• Type: Error

Invoked if the authorization failed, the request failed, or the file wasn't successfully uploaded.

.on('response', function (resp, metadata) {})

resp

• Type: Object

The HTTP response from request.

metadata

• Type: Object

The file's new metadata.

.on('finish', function () {})

The file was uploaded successfully.

---

upload.createURI(config, callback)

callback(err, resumableURI)

callback.err

• Type: Error

Invoked if the authorization failed or the request to start a resumable session failed.

callback.resumableURI

• Type: String

The resumable upload session URI.