Rollup Boost

This repo implements a proxy server for the Ethereum Engine API and is under active development. To read more about the design, check out the design doc.

Usage

Run the server using the following command:

cargo run -- [OPTIONS]

Command-line Options

• --jwt-token <TOKEN>: JWT token for authentication (required)
• --l2-url <URL>: URL of the local L2 execution engine (required)
• --builder-url <URL>: URL of the builder execution engine (required)
• --rpc-host <HOST>: Host to run the server on (default: 0.0.0.0)
• --rpc-port <PORT>: Port to run the server on (default: 8081)
• --tracing: Enable tracing (default: false)
• --log-level <LEVEL>: Log level (default: info)
• --boost-sync: Enable syncing the builder with the proposer op-node (default: false)

Environment Variables

You can also set the options using environment variables. See .env.example to use the default values.

Example

cargo run --jwt-token your_jwt_token --l2-url http://localhost:8545 --builder-url http://localhost:8546

Core System Workflow

1. By default, rollup-boost forwards all JSON-RPC API calls from proposer-op-node to proposer-op-geth.
2. When rollup-boost receives an engine_FCU with attributes (initiating block building):
   • It relays the call to proposer-op-geth as usual.
   • If builder-op-geth is synced to the chain tip, the call is also multiplexed to it.
   • The FCU call returns a PayloadID, which should be identical for both proposer-op-geth and builder-op-geth.
3. When rollup-boost receives an engine_getPayload:
   • It first queries proposer-op-geth for a fallback block.
   • In parallel, it queries builder-op-geth.
4. Upon receiving the builder-op-geth block:
   • rollup-boost validates the block with proposer-op-geth using engine_newPayload.
   • This validation ensures the block will be valid for proposer-op-geth, preventing network stalls due to invalid blocks.
   • If the external block is valid, it is returned to the proposer-op-node.
5. As per its normal workflow, the proposer-op-node sends another newPayload request to the sidecar and another FCU(without) to update the state of its op-geth node.
   • In this case, the sidecar just relays the data and does not introspect anything.
   • Note that since we already tested newPayload on the proposer-op-geth in the previous step, this process should be cached.

License

The code in this project is free software under the MIT License.

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