Grid file storage

Simple GridFS filestorage with simple API

Install

npm i --save grid-filestorage

Usage

const fs = require('fs');
const path = require('path');
const FileStorage = require('grid-filestorage');

const filestorage = new FileStorage(db, { title: 'Test' });
// db — is the native db connection to mongodb
// options.title — title of storage, optional. Title prepend with "-" before filename

const filestream = fs.createReadStream(path.join(__dirname, './test.png'));
const filename = 'testfile';
const meta = {
  "content_type": 'image/png'
}

filestorage.write(filestream, filename, meta).
then(filename => console.info(`file ${filename} in storage`));
// file Test-testfile in storage

With mongoose

// ...
const mongoose = require('mongoose');
const FileStorage = require('grid-filestorage');

const filestorage = new FileStorage(mongoose.connection.db);
// ...

Methods

Write a file — filestorage.write(stream, filename = new ObjectID(), meta = {})

This mehod streams stream into GridFS with filename and meta

1. stream — Readable stream
2. filename — name of file, optional. If filename does not exist, filestorage will auto-generate it
3. meta — meta information about file for GridFS, optional

{
  content_type: 'image/png',
  metadata:{
    author: 'Daniel'
  },
  chunk_size: 1024 * 4
}

• returns Promise
• resolve saved filename

Read a file — filestorage.read(filename, isExists = true)

This method read file from GridFS by filename

1. filename — name of file to read. If filestorage has title, filename must exclude title + '-' part
2. isExists — if this flag is true, method will check file before read

• returns Promise
• resolve Readable Stream or null, if file does not exist

Remove a file — filestorage.remove(filename, isExists = true)

This method remove file from GridFS by filename

1. filename — name of file to remove. If filestorage has title, filename must exclude title + '-' part
2. isExists — if this flag is true, method will check file before remove

• returns Promise
• reject FileStorageError — File does not exist, if file does not exist into GridFS