bridge_bot_example.ts

// Copyright 2025 bsnowden
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     https://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import {
    AddressLike,
    BigNumberish,
    Contract,
    WebSocketProvider,
    formatEther,
    Wallet,
    JsonRpcProvider,
  } from "ethers";
  import { Bridge__factory } from "./typechain-types";
  import * as dotenv from "dotenv";
  
  dotenv.config();
  
  const sepoliaProvider = new WebSocketProvider(
    process.env.SEPOLIA_WS_RPC_URL!!,
    {
      name: "sepolia",
      chainId: 11155111,
    },
  );

  const holeskyProvider = new WebSocketProvider(
    process.env.HOLESKY_WS_RPC_URL!!,
    {
      name: "holesky",
      chainId: 17000,
    },
  );
  
  const sepoliaBridgeContract = new Contract(
    process.env.SEPOLIA_BRIDGE_ADDRESS!!,
    Bridge__factory.abi,
    sepoliaProvider,
  );

  const holeskyBridgeContract = new Contract(
    process.env.SEPOLIA_BRIDGE_ADDRESS!!,
    Bridge__factory.abi,
    holeskyProvider,
  );
  
  console.log("bot listening!");
  
  sepoliaBridgeContract.on(
    "Deposit",
    async (depositor: AddressLike, amount: BigNumberish) => {
      const provider = new JsonRpcProvider(process.env.HOLESKY_RPC_URL!!, {
        name: "holesky",
        chainId: 17000,
      });
      const sender = new Wallet(process.env.PRIVATE_KEY!!, provider);
      const bridge = Bridge__factory.connect(
        process.env.HOLESKY_BRIDGE_ADDRESS!!,
        sender,
      );
      console.log(`sending ${formatEther(amount)} tokens to ${depositor}`);
      await bridge.release(depositor, amount);
      console.log(
        `sent ${formatEther(amount)} tokens to ${depositor} on Holesky contract: ${
          process.env.HOLESKY_BRIDGE_ADDRESS
        }`,
      );
    },
  );

  holeskyBridgeContract.on(
    "Deposit",
    async (depositor: AddressLike, amount: BigNumberish) => {
      const provider = new JsonRpcProvider(process.env.SEPOLIA_RPC_URL!!, {
        name: "sepolia",
        chainId: 11155111,
      });
      const sender = new Wallet(process.env.PRIVATE_KEY!!, provider);
      const bridge = Bridge__factory.connect(
        process.env.SEPOLIA_BRIDGE_ADDRESS!!,
        sender,
      );
      console.log(`sending ${formatEther(amount)} tokens to ${depositor}`);
      await bridge.release(depositor, amount);
      console.log(
        `sent ${formatEther(amount)} tokens to ${depositor} on Sepolia contract: ${
          process.env.SEPOLIA_BRIDGE_ADDRESS
        }`,
      );
    },
  );