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>

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

cd harmony

make

Note: make sure to run scripts/install_build_tools.shto make sure build tools are of correct versions.

Build

If you want to bypass the Makefile:

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
export GO111MODULE=on

Note : Some of our scripts require bash 4.x support, please install bash 4.x on MacOS X.

Build all executables

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

Build individual executables

Harmony server / main node:

./scripts/go_executable_build.sh harmony

Wallet:

./scripts/go_executable_build.sh wallet

Tx Generator:

./scripts/go_executable_build.sh txgen

Usage

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

Running local test

The debug.sh script calls test/deploy.sh script to create 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 2 shards and 7 nodes in each shard.

./test/debug.sh

Test local blockchain

source scripts/setup_bls_build_flags.sh
./bin/wallet list
./bin/wallet -p local balances

Terminate the local blockchain

./test/kill_nodes.sh

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
• Sharded P2P network and P2P gossiping
• FBFT (Fast Byzantine Fault Tolerance) Consensus with BLS multi-signature
• Consensus view-change protocol
• Account model and support for Solidity
• Cross-shard transaction
• VRF (Verifiable Random Function) and VDF (Verifiable Delay Function)
• Cross-links
• Information disposal algorithm using erasure encoding (to be integrated)
• Transaction generator for loadtesting
• Cuckoo-rule based resharding

Features To Be Implemented

• EPoS staking mechanism
• Leader rotation

Features Planned after Mainnet

• Integration with WASM
• Fast state synchronization
• Kademlia routing