Bridge app based on block header proofs

• main.ts - entry point for the validator app submiting blocks to the registry
• sdk.ts - sdk for submiting signed blocks from the registry to a bridge

Running the bridge validator app

• Run the script where you run your validator node
• The docker expects a local fusenet/config to exists where the private key is
• Alternatively you can provide a private key or mnemonic via env variables PRIVATE_KEY and MNEMONIC (see below how to set env variables)

curl https://raw.githubusercontent.com/GoodDollar/GoodBridge/master/packages/bridge-app/dockerstart.sh -o dockerstart.sh
chmod u+x dockerstart.sh
./dockerstart.sh

Using the sdk

import { BridgeSDK } from "@gooddollar/bridge-app/dist/sdk.js";

// blockheaderregistry contract
const registry = "0x44a1E0A83821E239F9Cef248CECc3AC5b910aeD2";

// your custom bridges contracts implementing BridgeCore, key is chainId and value the bridge contract
const bridges = {"122":"0x...","1":"0x..."};

//the checkpoint update frequency
const stepSize = 10;

const bridgeSDK = new BridgeSDK(
    registry,
    bridges,
    stepSize
  );

// relayTx = async (sourceChainId: number, targetChainId: number, txHash: string, signer: Signer)
// this will fetch the signed block from the registry and the receipt proof for that txHash and submit them
// to the bridge contract
const = { relayTxHash, relayPromise } = await sdk.relayTx(sourceChain, targetChain, txHash, signer)

Advanced configuration via env variables

• Edit the dockerstart.sh script and overwrite env variables with -e
• OR create a .env file in your local fusenet/config folder, env vars defined in this file will override any defined via -e

Env variables

• POLLING_INTERVAL (default 5000) - How often to query RPCs for new blocks (milliseconds)
• LOG_LEVEL (default info)
• REGISTRY_RPC (default http://172.17.0.1:8545) - RPC to for the blockchain with the registry contract
• FUSE_RPC (default http://172.17.0.1:8545) - RPC for fuse
• BLOCK_REGISTRY_ADDRESS
• CONSENSUS_ADDRESS (default 0x3014ca10b91cb3D0AD85fEf7A3Cb95BCAc9c0f79) - The fuse consensus contract to fetch latest set of validators and sign them
• TEST_MODE (default false) - When true will not submit blocks to registry
• STEP_SIZE (default 10) - Submit signed blockchain block every STEP_SIZE blocks
• CONFIG_DIR (default /config/) - Docker folder where private key json can be found
• DOTENV_FILE (default /config/.env) - Docker folder for .env to override defaults

Running app/sdk tests

• first deploy dev env by running in the bridge-contracts package the command yarn start:dev
• run yarn test