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# Lighthouse: an Ethereum Serenity client
# Lighthouse: Ethereum 2.0
An open-source Ethereum 2.0 client, written in Rust and maintained by Sigma Prime.
[![Build Status]][Build Link] [![Doc Status]][Doc Link] [![Gitter Badge]][Gitter Link]
@ -9,24 +11,119 @@
[Doc Status]: https://img.shields.io/badge/docs-master-blue.svg
[Doc Link]: http://lighthouse-docs.sigmaprime.io/
A work-in-progress, open-source implementation of the Serenity Beacon
Chain, maintained by Sigma Prime.
## Overview
The "Serenity" project is also known as "Ethereum 2.0" or "Shasper".
Lighthouse is:
## Lighthouse Client
- Fully open-source, licensed under Apache 2.0.
- Security-focussed, fuzzing has begun and security reviews are planned
for late-2019.
- Built in [Rust](https://www.rust-lang.org/), a modern language providing unique safety guarantees and
excellent performance (comparable to C++).
- Funded by various organisations, including Sigma Prime, the
Ethereum Foundation, Consensys and private individuals.
- Actively working to promote an inter-operable, multi-client Ethereum 2.0.
Lighthouse is an open-source Ethereum Serenity client that is currently under
development. Designed as a Serenity-only client, Lighthouse will not
re-implement the existing proof-of-work protocol. Maintaining a forward-focus
on Ethereum Serenity ensures that Lighthouse avoids reproducing the high-quality
work already undertaken by existing projects. As such, Lighthouse will connect
to existing clients, such as
[Geth](https://github.com/ethereum/go-ethereum) or
[Parity-Ethereum](https://github.com/paritytech/parity-ethereum), via RPC to enable
present-Ethereum functionality.
### Further Reading
## Development Status
Lighthouse, like all Ethereum 2.0 clients, is a work-in-progress. Instructions
are provided for running the client, however these instructions are designed
for developers and researchers working on the project. We do not (yet) provide
user-facing functionality.
Current development overview:
- Specification `v0.6.3` implemented, optimized and passing test vectors.
- Rust-native libp2p integrated, with Gossipsub.
- Discv5 (P2P discovery mechanism) integration started.
- Metrics via Prometheus.
- Basic gRPC API, soon to be replaced with RESTful HTTP/JSON.
### Roadmap
- **July 2019**: `lighthouse-0.0.1` release: A stable testnet for developers with a useful
HTTP API.
- **September 2019**: Inter-operability with other Ethereum 2.0 clients.
- **October 2019**: Public, multi-client testnet with user-facing functionality.
- **January 2020**: Production Beacon Chain testnet.
## Usage
Lighthouse consists of multiple binaries:
- [`beacon_node/`](beacon_node/): produces and verifies blocks from the P2P
connected validators and the P2P network. Provides an API for external services to
interact with Ethereum 2.0.
- [`validator_client/`](validator_client/): connects to a `beacon_node` and
performs the role of a proof-of-stake validator.
- [`account_manager/`](account_manager/): a stand-alone component providing key
management and creation for validators.
### Simple Local Testnet
**Note: these instructions are intended for developers and researchers. We do
not yet support end-users.**
In this example we use the `account_manager` to create some keys, launch two
`beacon_node` instances and connect a `validator_client` to one. The two
`beacon_nodes` should stay in sync and build a Beacon Chain.
First, clone this repository, [setup a development
environment](docs/installation.md) and navigate to the root directory of this repository.
Then, run `$ cargo build --all --release` and navigate to the `target/release`
directory.
#### 1. Generate Validator Keys
Generate 16 validator keys and store them in `~/.lighthouse-validator`:
```
$ ./account_manager -d ~/.lighthouse-validator generate_deterministic -i 0 -n 16
```
_Note: these keys are for development only. The secret keys are
deterministically generated from low integers. Assume they are public
knowledge._
#### 2. Start a Beacon Node
This node will act as the boot node and provide an API for the
`validator_client`.
```
$ ./beacon_node --recent-genesis --rpc
```
_Note: `--recent-genesis` defines the genesis time as either the start of the
current hour, or half-way through the current hour (whichever is most recent).
This makes it very easy to create a testnet, but does not allow nodes to
connect if they were started in separate 30-minute windows._
#### 3. Start Another Beacon Node
In another terminal window, start another boot node that will connect to the
running node.
```
$ ./beacon_node -r --boot-nodes /ip4/127.0.0.1/tcp/9000 --listen-address /ip4/127.0.0.1/tcp/9001
```
#### 4. Start a Validator Client
In a third terminal window, start a validator client:
```
$ ./validator-client
```
You should be able to observe the validator signing blocks, the boot node
processing these blocks and publishing them to the other node. If you have
issues, try restarting the beacon nodes to ensure they have the same genesis
time. Alternatively, raise an issue and include your terminal output.
## Further Reading
- [About Lighthouse](docs/lighthouse.md): Goals, Ideology and Ethos surrounding
this implementation.
@ -37,7 +134,7 @@ If you'd like some background on Sigma Prime, please see the [Lighthouse Update
\#00](https://lighthouse.sigmaprime.io/update-00.html) blog post or the
[company website](https://sigmaprime.io).
### Directory Structure
## Directory Structure
- [`beacon_node/`](beacon_node/): the "Beacon Node" binary and crates exclusively
associated with it.
@ -50,112 +147,10 @@ If you'd like some background on Sigma Prime, please see the [Lighthouse Update
- [`validator_client/`](validator_client/): the "Validator Client" binary and crates exclusively
associated with it.
### Components
The following list describes some of the components actively under development
by the team:
## Contributing
- **BLS cryptography**: Lighthouse presently use the [Apache
Milagro](https://milagro.apache.org/) cryptography library to create and
verify BLS aggregate signatures. BLS signatures are core to Serenity as they
allow the signatures of many validators to be compressed into a constant 96
bytes and efficiently verified. The Lighthouse project is presently
maintaining its own [BLS aggregates
library](https://github.com/sigp/signature-schemes), gratefully forked from
[@lovesh](https://github.com/lovesh).
- **DoS-resistant block pre-processing**: Processing blocks in proof-of-stake
is more resource intensive than proof-of-work. As such, clients need to
ensure that bad blocks can be rejected as efficiently as possible. At
present, blocks having 10 million ETH staked can be processed in 0.006
seconds, and invalid blocks are rejected even more quickly. See
[issue #103](https://github.com/ethereum/beacon_chain/issues/103) on
[ethereum/beacon_chain](https://github.com/ethereum/beacon_chain).
- **P2P networking**: Serenity will likely use the [libp2p
framework](https://libp2p.io/). Lighthouse is working alongside
[Parity](https://www.parity.io/) to ensure
[libp2p-rust](https://github.com/libp2p/rust-libp2p) is fit-for-purpose.
- **Validator duties** : The project involves development of "validator
services" for users who wish to stake ETH. To fulfill their duties,
validators require a consistent view of the chain and the ability to vote
upon blocks from both shard and beacon chains.
- **New serialization formats**: Lighthouse is working alongside researchers
from the Ethereum Foundation to develop *simpleserialize* (SSZ), a
purpose-built serialization format for sending information across a network.
Check out the [SSZ
implementation](https://github.com/ethereum/eth2.0-specs/blob/00aa553fee95963b74fbec84dbd274d7247b8a0e/specs/simple-serialize.md)
and this
[research](https://github.com/sigp/serialization_sandbox/blob/report/report/serialization_report.md)
on serialization formats for more information.
- **Fork-choice**: The current fork choice rule is
[*LMD Ghost*](https://vitalik.ca/general/2018/12/05/cbc_casper.html#lmd-ghost),
which effectively takes the latest messages and forms the canonical chain using
the [GHOST](https://eprint.iacr.org/2013/881.pdf) mechanism.
- **Efficient state transition logic**: State transition logic governs
updates to the validator set as validators log in/out, penalizes/rewards
validators, rotates validators across shards, and implements other core tasks.
- **Fuzzing and testing environments**: Implementation of lab environments with
continuous integration (CI) workflows, providing automated security analysis.
In addition to these components we are also working on database schemas, RPC
frameworks, specification development, database optimizations (e.g.,
bloom-filters), and tons of other interesting stuff (at least we think so).
### Running
**NOTE: The cryptography libraries used in this implementation are
experimental. As such all cryptography is assumed to be insecure.**
This code-base is still very much under-development and does not provide any
user-facing functionality. For developers and researchers, there are several
tests and benchmarks which may be of interest.
A few basic steps are needed to get set up:
1. Install [rustup](https://rustup.rs/). It's a toolchain manager for Rust (Linux | macOS | Windows). For installation, download the script with `$ curl -f https://sh.rustup.rs > rustup.sh`, review its content (e.g. `$ less ./rustup.sh`) and run the script `$ ./rustup.sh` (you may need to change the permissions to allow execution, i.e. `$ chmod +x rustup.sh`)
2. (Linux & MacOS) To configure your current shell run: `$ source $HOME/.cargo/env`
3. Use the command `rustup show` to get information about the Rust installation. You should see that the
active toolchain is the stable version.
4. Run `rustc --version` to check the installation and version of rust.
- Updates can be performed using` rustup update` .
5. Install build dependencies (Arch packages are listed here, your distribution will likely be similar):
- `clang`: required by RocksDB.
- `protobuf`: required for protobuf serialization (gRPC).
- `cmake`: required for building protobuf
6. Navigate to the working directory.
7. Run the test by using command `cargo test --all`. By running, it will pass all the required test cases.
If you are doing it for the first time, then you can grab a coffee in the meantime. Usually, it takes time
to build, compile and pass all test cases. If there is no error then it means everything is working properly
and it's time to get your hands dirty.
In case, if there is an error, then please raise the [issue](https://github.com/sigp/lighthouse/issues).
We will help you.
8. As an alternative to, or instead of the above step, you may also run benchmarks by using
the command `cargo bench --all`
##### Note:
Lighthouse presently runs on Rust `stable`, however, benchmarks currently require the
`nightly` version.
##### Note for Windows users:
Perl may also be required to build lighthouse. You can install [Strawberry Perl](http://strawberryperl.com/),
or alternatively use a choco install command `choco install strawberryperl`.
Additionally, the dependency `protoc-grpcio v0.3.1` is reported to have issues compiling in Windows. You can specify
a known working version by editing version in protos/Cargo.toml's "build-dependencies" section to
`protoc-grpcio = "<=0.3.0"`.
### Contributing
**Lighthouse welcomes contributors with open-arms.**
If you would like to learn more about Ethereum Serenity and/or
[Rust](https://www.rust-lang.org/), we are more than happy to on-board you
and assign you some tasks. We aim to be as accepting and understanding as
possible; we are more than happy to up-skill contributors in exchange for their
assistance with the project.
Alternatively, if you are an ETH/Rust veteran, we'd love your input. We're
always looking for the best way to implement things and welcome all
respectful criticisms.
**Lighthouse welcomes contributors.**
If you are looking to contribute, please head to our
[onboarding documentation](https://github.com/sigp/lighthouse/blob/master/docs/onboarding.md).
@ -170,10 +165,9 @@ your support!
## Contact
The best place for discussion is the [sigp/lighthouse gitter](https://gitter.im/sigp/lighthouse).
Ping @paulhauner or @AgeManning to get the quickest response.
# Donations
## Donations
If you support the cause, we could certainly use donations to help fund development:
If you support the cause, we accept donations to help fund development:
`0x25c4a76E7d118705e7Ea2e9b7d8C59930d8aCD3b` (donation.sigmaprime.eth)

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# Development Environment Setup
A few basic steps are needed to get set up (skip to #5 if you already have Rust
installed):
1. Install [rustup](https://rustup.rs/). It's a toolchain manager for Rust (Linux | macOS | Windows). For installation, download the script with `$ curl -f https://sh.rustup.rs > rustup.sh`, review its content (e.g. `$ less ./rustup.sh`) and run the script `$ ./rustup.sh` (you may need to change the permissions to allow execution, i.e. `$ chmod +x rustup.sh`)
2. (Linux & MacOS) To configure your current shell run: `$ source $HOME/.cargo/env`
3. Use the command `rustup show` to get information about the Rust installation. You should see that the
active toolchain is the stable version.
4. Run `rustc --version` to check the installation and version of rust.
- Updates can be performed using` rustup update` .
5. Install build dependencies (Arch packages are listed here, your distribution will likely be similar):
- `clang`: required by RocksDB.
- `protobuf`: required for protobuf serialization (gRPC).
- `cmake`: required for building protobuf
6. Navigate to the working directory.
7. Run the test by using command `cargo test --all`. By running, it will pass all the required test cases.
If you are doing it for the first time, then you can grab a coffee in the meantime. Usually, it takes time
to build, compile and pass all test cases. If there is no error then it means everything is working properly
and it's time to get your hands dirty.
In case, if there is an error, then please raise the [issue](https://github.com/sigp/lighthouse/issues).
We will help you.
8. As an alternative to, or instead of the above step, you may also run benchmarks by using
the command `cargo bench --all`
## Notes:
Lighthouse targets Rust `stable` but _should_ run on `nightly`.
### Note for Windows users:
Perl may also be required to build lighthouse. You can install [Strawberry Perl](http://strawberryperl.com/),
or alternatively use a choco install command `choco install strawberryperl`.
Additionally, the dependency `protoc-grpcio v0.3.1` is reported to have issues compiling in Windows. You can specify
a known working version by editing version in protos/Cargo.toml's "build-dependencies" section to
`protoc-grpcio = "<=0.3.0"`.