zksync-layerzero/src/bridge/StargateClient.ts

import { ethers } from 'ethers'
import { Router__factory, RouterETH, RouterETH__factory, StargateFeeLibraryV07__factory } from '../contract'
import { ChainId, chainInfoMap } from '../config/chain'
import polly from 'polly-js'
import { newLogger } from '../utils/logger'

export class StargateClient {
  static logger = newLogger('StargateClient')

  wallet: ethers.Wallet
  chainId: number
  provider: ethers.JsonRpcProvider

  constructor(privateKey: string, chainId: number) {
    this.chainId = chainId
    this.provider = new ethers.JsonRpcProvider(chainInfoMap[chainId].rpcUrl)
    this.wallet = new ethers.Wallet(privateKey, this.provider)
  }

  async getFeeInfo(fromChainId: number, toChainId: number, sendAmount: bigint) {
    const dummyAddress = '0x0000000000000000000000000000000000000001'
    const fee = StargateFeeLibraryV07__factory.connect(chainInfoMap[fromChainId].feeAddress, this.wallet)
    const { eqFee, eqReward, lpFee, protocolFee, lkbRemove } = await fee.getFees(
      13n,
      13n,
      toChainId,
      dummyAddress,
      sendAmount,
    )

    const finalFee = eqFee - eqReward + lpFee + protocolFee + lkbRemove
    console.log('fee', ethers.formatEther(finalFee))
  }

  async getL0GasCost(toChainId: number) {
    const dummyAddress = '0x0000000000000000000000000000000000000001'
    const router = Router__factory.connect(chainInfoMap[this.chainId].routerAddress, this.wallet)

    const [gasCost] = await router.quoteLayerZeroFee(toChainId, 1, dummyAddress, '0x', {
      dstGasForCall: 0n,
      dstNativeAmount: 0n,
      dstNativeAddr: dummyAddress,
    })
    return (gasCost * 120n) / 100n
  }

  async bridge(toChainId: number) {
    if(toChainId === ChainId.ZKSYNC) throw new Error('Unsupported.')
    return await polly()
      .waitAndRetry([1000 * 10, 1000 * 20, 1000 * 30, 1000 * 40])
      .executeForPromise(async info => {
        try {
          const routerEth = RouterETH__factory.connect(chainInfoMap[this.chainId].ethRouterAddress, this.wallet)
          const lzGasCost = await this.getL0GasCost(toChainId)
          const { gasCost, gasPrice, gasLimit } = await this.calculateGasCost(toChainId, routerEth, lzGasCost)
          let cost = gasCost
          let limit = gasLimit
          const balance = await this.provider.getBalance(this.wallet.address)
          // the cost is not precisely calculated, should be sufficient for common L2s
          if (balance < gasCost + lzGasCost) throw new Error('Insufficient balance')
          if (info.count > 0) {
            StargateClient.logger.info(`${this.wallet.address}: Retry ${info.count} times`)
          }
          const rate = BigInt(info.count) * 50n + 100n
          // add 20% gas cost for each retry
          cost = (cost * rate) / 100n
          limit = (limit * rate) / 100n
          const sendAmount = balance - lzGasCost - cost
          // const sendAmount = ethers.parseEther('0.01')
          const minReceiveAmount = (sendAmount * 995n) / 1000n
          const res = await routerEth.swapETH(
            toChainId,
            this.wallet.address,
            this.wallet.address,
            sendAmount,
            minReceiveAmount,
            { value: sendAmount + lzGasCost, gasLimit: limit, gasPrice },
          )
          const receipt = await res.wait()
          if (!receipt.status) {
            throw new Error('Transaction reverted')
          }
          return res.hash
        } catch (e) {
          StargateClient.logger.error(e.message, `Failed to bridge to ${toChainId}`)
          throw e
        }
      })
  }

  async calculateGasCost(toChainId: number, routerEth: RouterETH, lzGasCost: bigint) {
    const feeData = await this.provider.getFeeData()
    const gasPrice = feeData.gasPrice
    const amount = ethers.parseEther('0.001')
    const gasLimit = await routerEth.swapETH.estimateGas(
      toChainId,
      this.wallet.address,
      this.wallet.address,
      amount,
      0n,
      {
        value: amount + lzGasCost,
      },
    )
    // const gasCost = ((this.chainId === 110 ? gasPrice : ethers.parseUnits('0.6', 'gwei')) * gasLimit * 110n) / 100n
    return { gasCost: ethers.parseEther('0.00015'), gasPrice, gasLimit: (gasLimit * 150n) / 100n }
  }
}