RIF Storage.js
Client library integrating distributed storage projects
Warning: This project is in alpha state. There might (and most probably will) be changes in the future to its API and working. Also, no guarantees can be made about its stability, efficiency, and security at this stage.
Table of Contents
Install
npm
> npm install @rsksmart/rif-storage
Use in Node.js
var RifStorage = require('@rsksmart/rif-storage')
Use in a browser with browserify, webpack or any other bundler
var RifStorage = require('@rsksmart/rif-storage')
Use in a browser Using a script tag
Loading this module through a script tag will make the RifStorage
obj available in the global namespace.
<script src="https://unpkg.com/@rsksmart/rif-storage/dist/index.min.js"></script>
<!-- OR -->
<script src="https://unpkg.com/@rsksmart/rif-storage/dist/index.js"></script>
Usage
This is a client library, therefore you need to provide access to the provider's running node for specifics see Providers.
import RifStorage, { Provider } from '@rsksmart/rif-storage'
// Connects to locally running node
const storage = RifStorage(Provider.IPFS, { host: 'localhost', port: '5001', protocol: 'http' })
const fileHash = await storage.put(Buffer.from('hello world!'))
const retrievedData = await storage.get(fileHash) // Returns Buffer
console.log(retrievedData.toString()) // prints 'hello world!'
const directory = {
'file': { data: Buffer.from('nice essay')},
'other-file': { data: Buffer.from('nice essay')},
'folder/with-file': { data: Buffer.from('nice essay')},
'folder/with-other-folder/and-file': { data: Buffer.from('nice essay')}
}
const rootHash = await storage.put(directory)
const retrievedDirectory = await storage.get(rootHash)
Manager
This tool ships with utility class Manager
that supports easy usage of multiple providers in your applications.
It allows registration of all supported providers and then easy putting/getting data with
the same interface as providers.
It has concept of active provider which is the one to which the data are put()
.
When registering providers the first one will become the active one by default.
import { Manager, Provider } from '@rsksmart/rif-storage'
const storage = new Manager()
// The first added provider becomes also the active one
storage.addProvider(Provider.IPFS, { host: 'localhost', port: '5001', protocol: 'http' })
storage.addProvider(Provider.SWARM, { url: 'http://localhost:8500' })
const ipfsHash = await storage.put(Buffer.from('hello ipfs!')) // Stored to IPFS
storage.makeActive(Provider.SWARM)
const swarmHash = await storage.put(Buffer.from('hello swarm!')) // Stored to Swarm
console.log(storage.get(ipfsHash)) // Retrieves data from IPFS and prints 'hello ipfs!'
console.log(storage.get(swarmHash)) // Retrieves data from Swarm and prints 'hello swarm!'
See Manager's API documentation
Providers
This library integrates several (decentralized) storage providers, currently supported is:
- IPFS using js-ipfs-http-client
- Swarm
IPFS
in-browser node
✅
content-type support❌
RifStorage(Provider.IPFS, ipfsOptions)
ipfsOptions
are directly passed to js-ipfs-http-client, hence check that for syntax and options.
You can run a node directly in browser using js-ipfs. Just create instance and pass it instance instead of ipfsOption
.
When data are putted to IPFS they are automatically pinned on the node and CIDv1 is returned.
You can access the js-ipfs-http-client instance using .ipfs
property of the StorageProvider
object.
Swarm
in-browser node
❌
content-type support✅
RifStorage(Provider.SWARM, bzzOptions)
bzzOptions
can be:
-
url?: string
: URL of the running Swarm node. If not specified than requests will be aimed to from which URL the script of served (in browser). Or it fails (in NodeJs). -
timeout?: number | false
: number which specifies timeout period. Default value is10000
(ms). Iffalse
then no timeout.
API
Bellow is summary of the main APIs. See full API documentation here
factory(type: Provider, options: object) -> IpfsStorageProvider | SwarmStorageProvider
exposed as default export of the library
import RifStorage, {Provider} from '@rsksmart/rif-storage'
const provider = RifStorage(Provider.IPFS, options)
Provider
enum
IPFS | SWARM | MANAGER
Enum of supported providers.
import {Provider} from '@rsksmart/rif-storage'
Provider.IPFS
Directory
interface
Directory represents directory structure where keys are paths and values is DirectoryEntry
object. For example like:
const directory = {
'some/directory/with/file': {
data: 'some string to store',
contentType: 'text/plain',
size: 20
}
}
DirectoryEntry
interface
Object represents a file and some of its metadata in Directory
object.
Used both for data input (eq. as part of Directory
for put()
) or when retrieving data using get()
in case the address is not a single file.
-
data
can bestring
,Buffer
,Readable
-
size?: number
can be left out except whendata
isReadable
. Only applicable for Swarm. -
contentType?: string
is applicable only for Swarm provider.
DirectoryArray
Alternative data structure for representing directories. Used mainly together with streaming.
It is an array containing Entry
objects that is DirectoryEntry & { path: string }
Example:
const directory = [
{
path: 'file',
data: 'some string to store',
},
{
path: 'folder/and/file',
data: 'some string to store',
}
]
StorageProvider
interface
Interface implemented by IPFS and Swarm providers. Returned by factory()
.
StorageProvider.put(data, options) -> Promise<string>
Parameters:
-
data
- one of the following:-
string
,Buffer
,Readable
that represents single file -
Directory<string | Buffer | Readable>
|DirectoryArray<Buffer | Readable>
-
-
options
- options passed to either IPFS'sadd()
or Swarmsupload()
functions, they share:-
fileName?: string
- applicable only for single files, see note before
-
Filenames
When you are adding single-file or buffer/string/readable you can specify file-name under which it should be stored, using
the options
. When you do that the original data are wrapped in folder in order to persist this information. Therefore
when you .get()
this address then the result will be Directory
of one file.
StorageProvider.get(address, options) -> Promise<Directory<Buffer> | Buffer>
Retrieves data from provider's network.
Parameters:
-
address
- string hash or CID -
options
- options passed to either IPFS'sget()
or Swarm.
Returns:
-
Buffer
if the address was pointing to single raw file -
Directory
if the address was pointing to directory or single file with metadata
You can distinguish between these two using isDirectory(obj)
or isFile(obj)
.
import {isFile, isDirectory} from '@rsksmart/rif-storage'
const data = await provider.get('some directory hash')
console.log(isFile(data)) // false
console.log(isDirectory(data)) // true
StorageProvider.getReadable(address, options) -> Promise<Readable<DirectoryArray>>
Retrieves data from provider's network using streaming support.
Parameters:
-
address
- string hash or CID -
options
- options passed to either IPFS'sgetReadable()
or Swarm.
Returns Readable
in object mode that yields Entry
objects with Readable
as data
.
The data
has to be fully processed before moving to next entry.
Contribute
There are some ways you can make this module better:
- Consult our open issues and take on one of them
- Help our tests reach 100% coverage!