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区块链

概览​

该笔记本的目的是提供一种测试Langchain文档加载器（用于区块链）功能的方法。

起初，此加载器支持:

  • 加载来自NFT智能合约的NFT作为文档（ERC721和ERC1155）
  • 以太坊主网，以太坊测试网，多边形主网，多边形测试网（默认是 eth-mainnet）
  • Alchemy的getNFTsForCollection API

如果社区认为这个加载器有价值，那么它可以扩展。具体来说：

  • 可以添加其他API（例如交易相关的API）

此文档加载器需要:

The output takes the following format:

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

加载NFT到文档加载器​

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

alchemyApiKey = "..."

Option 1: Ethereum 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]

Option 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]