blockchain-javascript/scripts/lib/token-lib.js

const {web3} = require("hardhat");
const ierc20abi = require("../../abi/IERC20_ABI.json");

module.exports = class TokenLib {
  async handleToken(pool, zero) {
    const token = {
      'address': zero ? pool.token0 : pool.token1,
      'symbol': zero ? pool.symbol0 : pool.symbol1,
      'decimals': zero ? pool.decimals0 : pool.decimals1,
      'name': 'xxxxxxxx'
    }

    let tokenObj = this.tokenInstance[token.address]
    if (!tokenObj) {
      tokenObj = new web3.eth.Contract(ierc20abi, token.address)
      this.tokenInstance[token.address] = tokenObj
    }

    token.name = await tokenObj.methods.name().call()
    token.name = token.name.replace(/[^A-Za-z0-9 ]+/g, '').substring(0, 37)

    return token
  }

  async saveToken(lp, type = 'token') {
    try {
      const token = await this.handleToken(lp, true)

      // token的hash不同时为lp的情况才更新
      if (!this.lpInstance[token.address.toLowerCase()]) {
        await history.appendOrUpdate(type, token.address, token)
      }
    } catch (e) {
    }

    try {
      const token = await this.handleToken(lp, false)

      // token的hash不同时为lp的情况才更新
      if (!this.lpInstance[token.address.toLowerCase()]) {
        await history.appendOrUpdate(type, token.address, token)
      }
    } catch (e) {
    }
  }
}