Harmony

Installation Requirements

GMP and OpenSSL

brew install gmp
brew install openssl

Dev Environment Setup

The required go version is: go1.12

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=$LD_LIBRARY_PATH
export DYLD_FALLBACK_LIBRARY_PATH=$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 BLS_SWAP_G=1 -j4 && cd ..

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

cd harmony

export GO111MODULE=on

./scripts/go_executable_build.sh

Build

Note : Some of our scripts require bash 4.x support, please install bash 4.x on MacOS X. Make sure you set export GO111MODULE=on.

Build all executables

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

Build individual executables

Initialize BLS

source scripts/setup_bls_build_flags.sh

Harmony server / main node:

go build -o bin/harmony cmd/harmony/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

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.

./test/deploy.sh ./test/configs/beaconchain40.txt

Testing

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

./test/test_before_submit.sh

License

Harmony is licensed under the MIT License. See LICENSE file for the terms and conditions.

Harmony includes third-party open source code. In general, a source subtree with a LICENSE or COPYRIGHT file is from a third party, and our modifications thereto are licensed under the same third-party open source license.

Also please see our Fiduciary License Agreement 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 for details.

Development Status

Features Done

• Fully sharded network with beacon chain and shard chains
• Cuckoo-rule based resharding
• Staking on beacon chain
• Distributed randomness generation with VRF and VDF (Proof-of-Concept VDF)
• Sharded P2P network and P2P gossiping
• FBFT (Fast Byzantine Fault Tolerance) Consensus with BLS multi-signature
• Account model and support for Solidity
• Simple wallet program
• 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

• Secure VDF
• Consensus view-change protocol
• Cross-shard transaction

Features Planned after Mainnet

• Integration with WASM
• Fast state synchronization
• Kademlia routing