# Harmony
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## Installation Requirements
GMP and OpenSSL
```bash
brew install gmp
brew install openssl
```

## Dev Environment Setup

```bash
export GOPATH=$HOME/<path_of_your_choice>
export CGO_CFLAGS="-I$GOPATH/src/github.com/harmony-one/bls/include -I$GOPATH/src/github.com/harmony-one/mcl/include -I/usr/local/opt/openssl/include"
export CGO_LDFLAGS="-L$GOPATH/src/github.com/harmony-one/bls/lib -L/usr/local/opt/openssl/lib"
export LD_LIBRARY_PATH=$GOPATH/src/github.com/harmony-one/bls/lib:$GOPATH/src/github.com/harmony-one/mcl/lib:/usr/local/opt/openssl/lib
export LIBRARY_PATH=$LD_LIBRARY_PATH
export DYLD_LIBRARY_PATH=$LD_LIBRARY_PATH

mkdir -p $HOME/<path_of_your_choice>/src/github.com/harmony-one

cd $HOME/<path_of_your_choice>/src/github.com/harmony-one

git clone git@github.com:harmony-one/mcl.git

cd mcl && make -j4 && cd ..

git clone git@github.com:harmony-one/bls.git

cd bls && make -j4 && cd ..

git clone git@github.com:harmony-one/harmony.git

cd harmony

go get ./...

git submodule update --init --recursive

```

## Build

Harmony server / main node:
```
go build -o bin/harmony cmd/harmony.go
```

Beacon node:
```
go build -o bin/beacon cmd/beaconchain/main.go
```

Wallet:
```
go build -o bin/wallet cmd/client/wallet/main.go
```

Tx Generator:
```
go build -o bin/txgen cmd/client/txgen/main.go
```

You can also run the script `./scripts/go_executable_build.sh` to build all the executables.

Some of our scripts require bash 4.x support, please [install bash 4.x](http://tldrdevnotes.com/bash-upgrade-3-4-macos) on MacOS X.

## Usage
You may build the src/harmony.go locally and run local test.

### Running local test
The deploy.sh script creates a local environment of Harmony blockchain devnet based on the configuration file.
The configuration file configures number of nodes and their IP/Port.
The script starts one local beacon chain node, the blockchain nodes, and run a transactional generator program which generates and sends simulated transactions to the local blockchain.

```bash
./test/deploy.sh ./test/configs/local_config1.txt
```

## Testing

Make sure you use the following command and make sure everything passed before submitting your code.

```bash
./test/test_before_submit.sh
```

## License

Harmony is licensed under the MIT License.  See [`LICENSE`](LICENSE) file for
the terms and conditions.

Also please see [our Fiduciary License Agreement](FLA.md) if you are
contributing to the project.  By your submission of your contribution to us, you
and we mutually agree to the terms and conditions of the agreement.


## Contributing To Harmony

See [`CONTRIBUTING`](CONTRIBUTING.md) for details.

## Development Status

### Features Done

* Basic consensus protocol with O(n) complexity
* Basic validator server
* P2p network connection and unicast
* Account model and support for Solidity
* Simple wallet program
* Mock beacon chain with static sharding
* Information disposal algorithm using erasure encoding (to be integrated)
* Blockchain explorer with performance report and transaction lookup
* Transaction generator for loadtesting

### Features To Be Implemented

* Full beacon chain with multiple validators
* Resharding
* Staking on beacon chain
* Fast state synchronization
* Distributed randomness generation with VRF and VDF
* Kademlia routing
* P2P network and gossiping
* Full protocol of consensus with BLS multi-sig and view-change protocol
* Integration with WASM
* Cross-shard transaction