TheGraph 智能合约

下载相应依赖

 npm install -g @graphprotocol/graph-cli
 yarn global add @graphprotocol/graph-cli

配置文件 subgraph.yaml

specVersion: 版本
description: 描述
repository: 子图git仓库地址
schema:
  file: 子图数据目录结构文件 (相对路径 ./)
dataSources:
  - kind: ethereum/contract  (子图类型 合约)
    name: 合约名称
    network: 网络 (bsc,eth 等)
    source:
      address: 子图对应合约地址
      abi: abi名称
      startBlock: 开始查询的区块数
    mapping:
      kind: ethereum/events (子图类型 合约里的事件)
      apiVersion: 0.0.4 (版本)
      language: wasm/assemblyscript
      entities:
        - OptionNft
      abis:
        - name: OptionNft
          file: ./abis/OptionNft.json (相对路径)
      eventHandlers:
        - event: Transfer(indexed address,indexed address,indexed uint256) （查询事件名称）
          handler: handleTransfer （对应函数）
      file: ./src/OptionNft.ts （对应函数文件 相对路径）

创建对应文件
配置子图数据结构

type Option @entity {
  id: ID!
  from: Bytes!
  to: Bytes!
  tokenId: BigInt!
}

或(单层数据结构多层数据结构)

type Option @entity {
  id: ID!
  creator: Bytes!
  collateral: Bytes!
  underlying: Bytes!
  strikePrice: BigInt!
  expiry: BigInt!
  long: Bytes!
  short: Bytes!
  asks: [OrderAsk!]! @derivedFrom(field: "option")
}

type OrderAsk @entity {
  id: ID!
  askID: BigInt!
  binds: [OrderBid!]! @derivedFrom(field: "orderAsk")
  seller: Bytes!
  long: Bytes!
  volume: BigInt!
  settleToken: Bytes!
  price: BigInt!
  isCancel: Boolean!
  option: Option!
}

type OrderBid @entity {
  id: ID!
  bidID: BigInt!
  askID: BigInt!
  buyer: Bytes!
  volume: BigInt!
  amount: BigInt!
  orderAsk: OrderAsk!
}

命令行运行 graph codegen

npm i @graphprotocol/graph-ts
yarn add @graphprotocol/graph-ts

配置子图函数文件

import { Transfer } from '../generated/OptionNft/OptionNft'
import { Option } from '../generated/schema'
export function handleTransfer(event: Transfer): void {
    let option = new Option(event.params.tokenId.toHex())
    option.from = event.params.from
    option.to = event.params.to
    option.tokenId = event.params.tokenId
    option.save()
}