2022-09-16 13:25:07 +00:00
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# Light Client Proxy
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2022-09-30 10:56:16 +00:00
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[](https://github.com/status-im/nimbus-eth1/actions/workflows/lc_proxy.yml)
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[](https://opensource.org/licenses/Apache-2.0)
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[](https://opensource.org/licenses/MIT)
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[](https://discord.gg/XRxWahP)
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[](https://join.status.im/nimbus-general)
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## Introduction
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This folder holds the development of light client proxy. Light client proxy
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uses the [consensus light client](https://github.com/ethereum/consensus-specs/tree/dev/specs/altair/light-client)
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to follow the tip of the consensus chain and exposes the standard Ethereum [JSON RPC Execution API](https://github.com/ethereum/execution-apis).
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The API calls are proxied to a configured web3 data provider and the provider its responses are verified
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against recent consensus data provided by the light client before returning
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the result to the caller.
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### Build light client proxy
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```bash
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git clone git@github.com:status-im/nimbus-eth1.git
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cd nimbus-eth1
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make lc-proxy
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# See available command line options
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./build/lc_proxy --help
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```
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### Important command line options
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Most of command line options have reasonable defaults. There are two options which
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needs to be explicitly configured by user.
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`--trusted-block-root` - option necessary to initialize the consensus light client.
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The trusted block should be within the weak subjectivity period,
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and its root should be from a finalized Checkpoint.
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`--web3-url` - as the proxy does not have any storage, it needs to know an endpoint which
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will provide all the requested data. This can either be a known full node, or
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an external provider like [Alchemy](https://www.alchemy.com/).
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First requirement for the external provider is that it must support the standard Ethereum JSON RPC Execution API, and specifically
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it MUST also support the [eth_getProof](https://eips.ethereum.org/EIPS/eip-1186) call.
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The latter is necessary to validate the provided data against the light client.
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The second requirement is that data served from provider needs to be consistent with
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the configured light client network. By default the light client proxy is configured
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to work on mainnet. In this case, the configured provider needs to serve mainnet data.
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This is verified on start-up by querying the provider its `eth_chainId` endpoint, and comparing the
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received chain id with the one configured locally. If this validation fails, the light
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client proxy process will quit.
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[Detailed document](./docs/metamask_configuration.md) showing how to configure the proxy and pair it with
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MetaMask.
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### Update and rebuild light client proxy
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```bash
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# From the nimbus-eth1 repository
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git pull
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# To bring the git submodules up to date
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make update
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make lc-proxy
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```
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### Run light client proxy test suite
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```bash
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# From the nimbus-eth1 repository
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make lc-proxy-test
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```
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### Windows support
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Follow the steps outlined [here](../README.md#windows) to build light client proxy on Windows.
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## For Developers
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When working on this repository, you can run the `env.sh` script to run a
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command with the right environment variables set. This means the vendored
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Nim and Nim modules will be used, just as when you use `make`.
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E.g.:
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```bash
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# start a new interactive shell with the right env vars set
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./env.sh bash
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```
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## License
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Licensed and distributed under either of
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* MIT license: [LICENSE-MIT](../LICENSE-MIT) or http://opensource.org/licenses/MIT
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or
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* Apache License, Version 2.0, ([LICENSE-APACHEv2](../LICENSE-APACHEv2) or http://www.apache.org/licenses/LICENSE-2.0)
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at your option. These files may not be copied, modified, or distributed except according to those terms.
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