Frontier is Substrate's Ethereum compatibility layer. It allows you to run unmodified Ethereum dapps.
The goal of Ethereum compatibility layer is to be able to:
- Run a normal web3 application via the compatibility layer, using local nodes, where an extra bridge binary is acceptable.
- Be able to import state from Ethereum mainnet.
It consists of the following components:
- pallet-evm: EVM execution engine for Substrate.
- pallet-ethereum: Emulation of full Ethereum block processing.
- rpc-ethereum: Compatibility layer for web3 RPC methods.
Frontier is still work-in-progress. Below are some notes about the development.
The vendor folder contains dependencies that contains changes that has not yet been upstreamed. Once the upstreaming process is finished, the corresponding submodule should be removed from vendor folder, and directly use upstream.
The substrate submodule contains a large quantity of dependencies, so they
should directly use path directive in dependency declarations. For other
dependencies, they should use Cargo's patch feature in workspace declaration.
To install those submodules, from the frontier root folder:
git submodule init
git submodule update