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区块链

概述​

本笔记本的目的是提供一种测试Langchain区块链文档加载器功能的方法。

最初，此加载器支持：

  • 从NFT智能合约（ERC721和ERC1155）加载NFT作为文档
  • 以太坊主网, 以太坊测试网, Polygon主网, Polygon测试网 (默认为 eth-mainnet)
  • Alchemy的getNFTsForCollection API

如果社区认为这个加载器有价值，它可以被扩展。具体来说：

  • 可以添加额外的API（例如，与交易相关的API）

此文档加载器需要：

输出采用以下格式：

  • pageContent= 单个NFT
  • metadata={'source': '0x1a92f7381b9f03921564a437210bb9396471050c', 'blockchain': 'eth-mainnet', 'tokenId': '0x15'}

将NFTs加载到文档加载器中​

# get ALCHEMY_API_KEY from https://www.alchemy.com/

alchemyApiKey = "..."

选项1：以太坊主网（默认区块链类型）​

from langchain_community.document_loaders.blockchain import (
    BlockchainDocumentLoader,
    BlockchainType,
)

contractAddress = "0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d"  # Bored Ape Yacht Club contract address

blockchainType = BlockchainType.ETH_MAINNET  # default value, optional parameter

blockchainLoader = BlockchainDocumentLoader(
    contract_address=contractAddress, api_key=alchemyApiKey
)

nfts = blockchainLoader.load()

nfts[:2]

选项2：Polygon 主网​

contractAddress = (
    "0x448676ffCd0aDf2D85C1f0565e8dde6924A9A7D9"  # Polygon Mainnet contract address
)

blockchainType = BlockchainType.POLYGON_MAINNET

blockchainLoader = BlockchainDocumentLoader(
    contract_address=contractAddress,
    blockchainType=blockchainType,
    api_key=alchemyApiKey,
)

nfts = blockchainLoader.load()

nfts[:2]

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