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Drive

Auto-Drive Package Documentation​

Introduction​

The @autonomys/auto-drive package provides utilities for creating and managing IPLD DAGs (InterPlanetary Linked Data Directed Acyclic Graphs) for files and folders. It facilitates chunking large files, handling metadata, and creating folder structures suitable for distributed storage systems like IPFS.

Features​

  • File Chunking and DAG Creation: Efficiently split large files into smaller chunks and create IPLD DAGs.
  • Folder Structure Creation: Generate IPLD DAGs for directory structures.
  • Metadata Handling: Add and manage metadata for files and folders.
  • CID Management: Utilities for working with Content Identifiers (CIDs).
  • TypeScript Support: Fully typed for enhanced developer experience.

Installation​

Install the package via npm or yarn:

# Using npm
npm install @autonomys/auto-drive

# Using yarn
yarn add @autonomys/auto-drive

Importing the Package​

Before using the functions provided by the auto-drive package, you need to import them into your project:

// Import specific functions
import { createFileIPLDDag, createFolderIPLDDag } from '@autonomys/auto-drive';

// Or import everything
import * as drive from '@autonomys/auto-drive';

Available Functions​

File and Folder DAG Creation​

  • createFileIPLDDag(fileBuffer, fileName): IPLDDag: Creates an IPLD DAG for a file from its buffer and name.
  • createFolderIPLDDag(childCIDs, folderName, folderSize): IPLDDag: Creates an IPLD DAG for a folder with given child CIDs, name, and size.

CID Utilities​

  • cidOfNode(node): CID: Generates a CID from an IPLD node.
  • cidToString(cid): string: Converts a CID to its string representation.
  • stringToCid(cidString): CID: Parses a CID string back into a CID object.

Node Encoding and Decoding​

  • encodeNode(node): Uint8Array: Encodes an IPLD node into a byte array.
  • decodeNode(encodedNode): any: Decodes a byte array back into an IPLD node.

Metadata Handling​

  • createMetadataNode(metadata): any: Creates a metadata node for an IPLD DAG.
  • createMetadataIPLDDag(metadata): IPLDDag: Creates an IPLD DAG for metadata.

Note: All asynchronous functions return a Promise and should be used with await for proper execution flow.

Usage Examples​

1. Creating an IPLD DAG from a File​

Create an IPLD DAG for a file:

import { createFileIPLDDag } from '@autonomys/auto-drive';
import fs from 'fs';

const fileBuffer = fs.readFileSync('path/to/your/file.txt');

const dag = createFileIPLDDag(fileBuffer, 'file.txt');

console.log('File DAG created:', dag);

2. Creating an IPLD DAG from a Folder​

Create an IPLD DAG for a folder:

import { createFolderIPLDDag } from '@autonomys/auto-drive';
import { CID } from 'multiformats';

// Example child CIDs and folder information
const childCIDs: CID[] = [
  /* array of CIDs */
];
const folderName = 'my-folder';
const folderSize = 1024; // size in bytes

const folderDag = createFolderIPLDDag(childCIDs, folderName, folderSize);

console.log('Folder DAG created:', folderDag);

3. Working with CIDs​

Generate and manipulate CIDs:

import { cidOfNode, cidToString, stringToCid } from '@autonomys/auto-drive';

// Assuming you have an IPLD node
const node = { /* IPLD node data */ };

// Create a CID from a node
const cid = cidOfNode(node);

// Convert the CID to a string
const cidString = cidToString(cid);
console.log('CID as string:', cidString);

// Parse a string back into a CID
const parsedCID = stringToCid(cidString);
console.log('Parsed CID:', parsedCID);

4. Encoding and Decoding Nodes​

Encode and decode IPLD nodes:

import { encodeNode, decodeNode } from '@autonomys/auto-drive';

// Assume you have an IPLD node
const node = { /* IPLD node data */ };

// Encode a node
const encodedNode = encodeNode(node);

// Decode a node
const decodedNode = decodeNode(encodedNode);

console.log('Decoded node:', decodedNode);

5. Handling Metadata​

Add metadata to a node:

import { createMetadataNode } from '@autonomys/auto-drive';

const metadata = {
  name: 'My File',
  description: 'This is a sample file',
  // ... other metadata fields
};

const metadataNode = createMetadataNode(metadata);

console.log('Metadata node created:', metadataNode);

6. Example: Creating a File DAG and Converting to CID​

import { createFileIPLDDag, cidOfNode, cidToString } from '@autonomys/auto-drive';
import fs from 'fs';

const fileBuffer = fs.readFileSync('path/to/your/file.txt');

const dag = createFileIPLDDag(fileBuffer, 'file.txt');

// Generate CID from the DAG
const cid = cidOfNode(dag.head);

// Convert CID to string
const cidString = cidToString(cid);

console.log(`CID of the file DAG: ${cidString}`);

7. Example: Converting Metadata to DAG​

import {
  createMetadataIPLDDag,
  cidOfNode,
  cidToString,
  type OffchainMetadata,
} from '@autonomys/auto-drive';
import fs from 'fs';

const metadataContent = fs.readFileSync('path/to/your/metadata.json', 'utf-8');
const metadata: OffchainMetadata = JSON.parse(metadataContent);

const dag = createMetadataIPLDDag(metadata);

const cid = cidOfNode(dag.head);
const cidString = cidToString(cid);

console.log(`CID of the metadata DAG: ${cidString}`);

Notes​

  • Asynchronous Functions: Use await with all promises for proper execution flow.
  • Error Handling: Wrap asynchronous calls in try...catch blocks to handle potential errors gracefully.
  • File System Operations: Ensure that file paths are correct and accessible when reading from or writing to the file system.