# Prysmatic Labs Ethereum Serenity Implementation

[![Build status](https://badge.buildkite.com/b555891daf3614bae4284dcf365b2340cefc0089839526f096.svg)](https://buildkite.com/prysmatic-labs/prysm)

This is the main repository for the beacon chain and sharding implementation for Ethereum Serenity [Prysmatic Labs](https://prysmaticlabs.com).

Before you begin, check out our [Contribution Guidelines](#contributing) and join our active chat room on Discord or Gitter below:

[![Discord](https://user-images.githubusercontent.com/7288322/34471967-1df7808a-efbb-11e7-9088-ed0b04151291.png)](https://discord.gg/KSA7rPr)
[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/prysmaticlabs/geth-sharding?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)

Also, read our [Sharding Reference Implementation Doc](https://github.com/prysmaticlabs/prysm/blob/master/docs/SHARDING.md). This doc provides a background on the sharding implementation we follow at Prysmatic Labs.


# Table of Contents

-   [Running Our Demo Release](#running-our-demo-release)
    - [Installation](#installation)
    - [Run Our Pre-Compiled Binaries](#run-our-pre-compiled-binaries)
    - [Run Via Bazel (Recommended)](#run-via-bazel-recommended)
    - [Running The Beacon Chain](#running-the-beacon-chain)
    - [Running an ETH2.0 Validator Client](#running-an-eth2.0-validator-client)
    - [Running Via Docker](#running-via-docker)
    - [Running Under Windows](#running-under-windows)
-   [Testing](#testing)
-   [Contributing](#contributing)
-   [License](#license)

# Running Our Demo Release

To run our current release, v0.0.0, as a local demo, you'll need to run a beacon chain node and a validator client.

In this local demo, you can start a beacon chain from genesis, connect as a validator client through a public key, and propose/vote on beacon blocks during each cycle. For more information on the full scope of the public demo, see the demo information [here](https://github.com/prysmaticlabs/prysm/blob/master/docs/DEMO_INFORMATION.md).

## Installation

You can either choose to run our system via:

- Downloading our Precompiled Binaries from our latest [release](https://github.com/prysmaticlabs/prysm/releases)
- Use Docker
- Use Our Build Tool, Bazel **(Recommended)**

## Run Our Pre-Compiled Binaries

First, download our latest [release](https://github.com/prysmaticlabs/prysm/releases) for your operating system. Then:

```
chmod +x ./beacon-chain
chmod +x ./validator
```

## Run Via Bazel (Recommended)

First, clone our repository:

```
git clone https://github.com/prysmaticlabs/prysm
```

Download the Bazel build tool by Google [here](https://docs.bazel.build/versions/master/install.html) and ensure it works by typing:

```
bazel version
```

Bazel manages all of the dependencies for you (including go and necessary compilers) so you are all set to build prysm.


### Building

Then, build both parts of our system: a beacon chain node implementation, and a validator client:

```
bazel build //beacon-chain:beacon-chain
bazel build //validator:validator
```

## Running The Beacon Chain

To start the system, we need to seed the beacon chain state with an initial validator set for local development. We created a reference [genesis.json](https://github.com/prysmaticlabs/prysm/blob/master/genesis.json) in the prysm base directory for this! You'll also need a special data directory where all the beacon chain data will be persisted to. 

Then, you can run the node as follows:

With the binary executable:

```
./beacon-chain \
  --genesis-json /path/to/genesis.json \
  --datadir /path/to/your/datadir \
  --rpc-port 4000 \
  --simulator \
  --demo-config
```

With bazel:

```
bazel run //beacon-chain --\
  --genesis-json /path/to/genesis.json \
  --datadir /path/to/your/datadir \
  --rpc-port 4000 \
  --simulator \
  --demo-config
```


We added a `--simulator` flag that simulates other nodes connected to you sending your node blocks for processing. Given this is a local development version and you'll only be running 1 validator client, this gives us a good idea of what the system will need to handle in the wild and will help advance the chain.

We also have a `--demo-config` flag that configures some internal parameters for you to run a local demo version of the system.

If you want to see what's happening in the system underneath the hood, add a `--verbosity debug` flag to show every single thing the beacon chain node does during its run time. If you want to rerun the beacon chain, delete and create a new data directory for the system to start from scratch.

![beaconsystem](https://i.imgur.com/vsUfLFu.png)

## Running an ETH2.0 Validator Client

Once your beacon node is up, you'll need to attach a validator client as a separate process. This validator is in charge of running Casper+Sharding responsibilities (shard state execution to be designed in phase 2). This validator will listen for incoming beacon blocks and shard assignments and determine when its time to perform attester/proposer responsibilities accordingly.

To get started, you'll need to use a public key from the initial validator set of the beacon node. Here are a few you can try out:

```
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
```

Run as follows:

With the binary executable:

```
./validator \
  --beacon-rpc-provider http://localhost:4000 \
  --datadir /path/to/uniquevalidatordatadir \
  --pubkey CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
```

With Bazel:

```
bazel run //validator --\
  --beacon-rpc-provider http://localhost:4000 \
  --datadir /path/to/uniquevalidatordatadir \
  --pubkey CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
```


This will connect you to your running beacon node and listen for shard/slot assignments! The beacon node will update you at every cycle transition and shuffle your validator into different shards and slots in order to vote on or propose beacon blocks.

if you want to run multiple validator clients, **each one needs to have its own data directory where it will persist information, so create a new one each time** and pass it into the validator command with the flag `--datadir /path/to/validatordatadir`.

## Running Via Docker

```
docker run -p 4000:4000 -v /path/to/genesis.json:/genesis.json gcr.io/prysmaticlabs/prysm/beacon-chain:latest \
  --genesis-json /genesis.json \
  --rpc-port 4000 \
  --simulator \
  --demo-config
```

Then, to run a validator client, use:

```
docker run gcr.io/prysmaticlabs/prysm/validator:latest \
  --beacon-rpc-provider http://{YOUR_LOCAL_IP}:4000 \
  --pubkey CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
```


This will connect you to your running beacon node and listen for shard/slot assignments! The beacon node will update you at every cycle transition and shuffle your validator into different shards and slots in order to vote on or propose beacon blocks.

## Running While Connected to a Mainchain Ethereum 1.0 Node

If you want to run the system with a real Web3 endpoint to listen for incoming Ethereum 1.0 block hashes, follow the instructions on setting up a geth node [here](https://github.com/prysmaticlabs/prysm/blob/master/docs/MAINCHAIN.md).

## Running Under Windows

The best way to run under Windows is to clone the repository and then run the node with go run from the Windows command line. Go 1.10 fails due to documented permission errors so be sure you are running Go 1.11 or later. Go through the source code and resolve any dependencies. Create two empty files for use as data directories by the beacon chain and validator respectively. The contents of these files should be deleted each time you run the software. After cloning the Prsym repository, run the node as follows:

```
go run ./beacon-chain main.go \
   --genesis-json /path/to/genesis.json \
   --datadir /path/to/your/datadir \
   --rpc-port 4000 \
   --simulator \
   --demo-config
```

After the beacon chain is up and running, run the validator client as a separate process as follows:

```
go run ./validator/main.go \
  --beacon-rpc-provider http://localhost:4000 \
  --datadir /path/to/uniquevalidatordatadir \
  --pubkey CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
```

# Testing

To run the unit tests of our system do:

```
bazel test //...
```

To run our linter, make sure you have [gometalinter](https://github.com/alecthomas/gometalinter) installed and then run:

```
gometalinter ./...
```

# Contributing

We have put all of our contribution guidelines into [CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/master/CONTRIBUTING.md)! Check it out to get started.

![nyancat](https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRBSus2ozk_HuGdHMHKWjb1W5CmwwoxmYIjIBmERE1u-WeONpJJXg)

# License

[GNU General Public License v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html)