ethers.js 和 node.js获取合约里的事件_ettherjs provider

上面几篇文章有用到web3.js 获取合约里的事件，发现有时候事件多的话会报超出访问限制，我用ethers.js的 JsonRpcBatchProvider解决了这个问题。

JsonRpcBatchProvider他是把多个访问rpc的请求组装成一个请求返回数据， 减少了rpc的调用次数， 降低了rpc响应时间

安装环境

电脑要安装node 环境

npm install ethers
yarn add ethers
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主要代码

import { providers, utils} from 'ethers'
import path from 'path'
import fs from 'fs'

class Model {
  introBindAbi: any
  provider: any
  constructor () {
    this.initWeb3()
  }
   
  async initWeb3 () {
    this.introBindAbi = JSON.parse((fs.readFileSync(path.resolve(__dirname, '../abi/introBindAbi.json'))).toString())
    
    this.provider = new providers.JsonRpcBatchProvider(config.rpcUrl);
  }
  getBlockNumber () {
    return this.provider.getBlockNumber()
  }
  
  async getIntroBindLogData (localBlock: Number, endBlock: Number) {
    let Interface = new utils.Interface(this.introBindAbi)
    let filter = {
      address: config.introBindContractAddress,
      fromBlock: localBlock,
      toBlock: endBlock,
    }
    let logs = await this.provider.getLogs(filter)
    console.log(logs.length, 'logs.length')
    for(let i = 0; i < logs.length ;i++) {
      let item = logs[i]
      try {
        let data = Interface.parseLog({topics:item.topics, data: item.data})
        switch(data.name) {
          case 'BindIntroLog':
            break
        }
      
      } catch (error) {
      
      }
    }
  }
}
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