opnode

op-node

This is the reference implementation of the rollup-node spec.

Compiling

Compile a binary:

cd op-node
go build -o bin/op-node ./cmd

Testing

Run op-node unit tests:

cd op-node
go test ./...

Run end-to-end tests:

cd op-e2e
go test ./...

Running

Options can be reviewed with:

./bin/op-node --help

To start syncing the rollup:

Connect to at least one L1 RPC and L2 execution engine:

• L1: use any L1 node / RPC (websocket connection path may differ)
• L2: run the Kroma fork of op-geth: kroma-geth

# websockets or IPC preferred for event notifications to improve sync, http RPC works with adaptive polling.
op \
  --l1=ws://localhost:8546 --l2=ws//localhost:9001 \
  --rollup.config=./path-to-network-config/rollup.json \
  --rpc.addr=127.0.0.1 \
  --rpc.port=7000

Devnet Genesis Generation

The op-node can generate geth compatible genesis.json files. These files can be used with geth init to initialize the StateDB with accounts, storage, code and balances. The L2 state must be initialized with predeploy contracts that exist in the state and act as system level contracts. The op-node can generate a genesis file with these predeploys configured correctly given hardhat compilation artifacts, hardhat deployment artifacts, a L1 RPC URL and a deployment config.

The hardhat compilation artifacts are produced by hardhat compile. The native hardhat compiler toolchain produces them by default and the @foundry-rs/hardhat plugin can also produce them when using the foundry compiler toolchain. They can usually be found in an artifacts directory.

The hardhat deployment artifacts are produced by running hardhat deploy. These exist to make it easy to track deployments of smart contract systems over time. They can usually be found in a deployments directory.

The deployment config contains all of the information required to deploy the system. It can be found in packages/contracts/deploy-config. Each deploy config file can be JSON or TypeScript, although only JSON files are supported by the op-node. The network name must match the name of the file in the deploy config directory.

Example usage:

$ op-node genesis devnet-l2 \
   --artifacts $CONTRACTS/artifacts \
   --network $NETWORK \
   --deployments $CONTRACTS/deployments \
   --deploy-config $CONTRACTS/deploy-config \
   --rpc-url http://localhost:8545