fs-gzip-blob-storage

fs-gzip-blob-storage

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

This is a wrapper for fs-blob-storage

Requirements

This module requires ES6 with Node >= 10.

Installation

npm install fs-gzip-blob-storage

Additionally for Typescript:

npm install -D @types/node

Usage

const {FsGzipBlobStorage} = require("fs-gzip-blob-storage")

Typescript:

import FsGzipBlobStorage from "fs-gzip-blob-storage"
// or
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 file name for the object (optional, default: this.ext)
• part is a extension added to file name which can be later commited (optional, default: this.part)

Creates a writable stream for a new object in the storage. 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 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 the object doesn't exist or its size is zero.

commit

await storage.commit(key, options)

Options:

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

Commits the object in the storage. It means that 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.

remove

await storage.remove(key, options)

Options:

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

Removes the object from the storage. Throws an error if has occurred or the object doesn't exist.

License

Copyright (c) 2018-2020 Piotr Roszatycki [e-mail]

MIT

Changelog

v3.0.0 2020-10-07

• DEFAULT_EXT, DEFAULT_PART and DEFAULT_GZIP_EXT are constant strings.
• Requires Node >= 10.
• Converted from tslint to eslint.