nft.storage/dist/src/bs-car-reader.cjs

A client library for the https://nft.storage/ service. It provides a convenient interface for working with the HTTP API from a web browser or Node.js

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

/**
 * An implementation of the CAR reader interface that is backed by a blockstore.
 *
 * @typedef {import('multiformats').CID} CID
 * @typedef {import('@ipld/car/api').CarReader} CarReader
 * @implements {CarReader}
 */
class BlockstoreCarReader {
  /**
   * @param {number} version
   * @param {CID[]} roots
   * @param {import('ipfs-car/blockstore').Blockstore} blockstore
   */
  constructor(version, roots, blockstore) {
    /**
     * @private
     */
    this._version = version;
    /**
     * @private
     */
    this._roots = roots;
    /**
     * @private
     */
    this._blockstore = blockstore;
  }

  get version() {
    return this._version
  }

  get blockstore() {
    return this._blockstore
  }

  async getRoots() {
    return this._roots
  }

  /**
   * @param {CID} cid
   */
  has(cid) {
    return this._blockstore.has(cid)
  }

  /**
   * @param {CID} cid
   */
  async get(cid) {
    const bytes = await this._blockstore.get(cid);
    return { cid, bytes }
  }

  blocks() {
    return this._blockstore.blocks()
  }

  async *cids() {
    for await (const b of this.blocks()) {
      yield b.cid;
    }
  }
}

exports.BlockstoreCarReader = BlockstoreCarReader;
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