Fs-gzip-blob-storage NPM

fs-gzip-blob-storage

Blob storage on a filesystem, with gzip, streams and promises API.

This is a wrapper for fs-blob-storage

Requirements

This module requires ES6 with Node >= 16.

Installation

npm install fs-gzip-blob-storage

Additionally for Typescript:

npm install -D @types/node

Usage

import FsGzipBlobStorage from "fs-gzip-blob-storage"

DEFAULT_EXT

The default ext option is ''

DEFAULT_GZIP_EXT

The default gzipExt option is '.gz'

DEFAULT_PART

The default part option is '.part'

constructor

const storage = new FsGzipBlobStorage(options)

Options:

ext is a default ext argument for methods (optional, default: DEFAULT_EXT)
part is a default part argument for methods (optional, default: DEFAULT_PART)
exclusive if is true then can't create new object if already exists with the same key (optional, default: false)
gzipExt is an extra extension for gzipped files (optional, default: DEFAULT_GZIP_EXT)
gzipOptions is an object with options for gzip/gunzip (optional)
path is a directory path of the storage (optional, default: ".")

Example:

const storage = new FsGzipBlobStorage({
  path: "/usr/share/man",
  exclusive: true,
})

createWriteStream

const writable = await storage.createWriteStream(key, options)

Options:

ext is a default extension added to the file name for the object (optional, default: this.ext)
part is a extension added to the file name which can be later committed (optional, default: this.part)

Creates a writable stream for a new object in the storage. The object is gzipped and stored with the file name based on key and ext and gzipExt and part. Throws an error if has occurred and if the file already exists for exclusive mode.

createReadStream

const readable = await storage.createWriteStream(key, options)

Options:

ext is a default extension added to the file name for the object (optional, default: this.ext)

Creates a readable stream for an existing, gunzipped object in the storage. Throws an error if has occurred or if the object doesn't exist or its size is zero.

commit

await storage.commit(key, options)

Options:

ext is a default extension added to the file name for the object (optional, default: this.ext)
part is a extension added to the file name which can be later committed (optional, default: this.part)

Commits the object in the storage. It means that the file name for the object is renamed and the additional extension for partial objects is removed. Throws an error if has occurred or the object doesn't exist.