LangChain

区块链 #

概述 #

这篇笔记的目的是为Langchain文档加载程序提供一个测试功能的手段，用于区块链。

最初，这个加载程序支持：

从NFT智能合约（ERC721和ERC1155)加载NFT作为文档
Ethereum Maninnet，Ethereum Testnet，Polgyon Mainnet，Polygon Testnet（默认为eth-mainnet)
Alchemy的getNFTsForCollection API

如果社区发现该加载程序有价值，它可以扩展。具体而言：

可以添加其他API（例如交易相关的API)

这个文档加载器需要：

免费的 Alchemy API Key (opens in a new tab)

输出采用以下格式：

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

将NFT加载到文档加载器中 #

alchemyApiKey = "get from https://www.alchemy.com/ and set in environment variable ALCHEMY_API_KEY"

选项一: Ethereum Mainnet (默认是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]

选项二: Polygon Mainnet #

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]

Blackboard Chatgpt Loader