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The elixir-omg repository contains OmiseGO's Elixir implementation of Plasma and forms the basis for the OMG Network.

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IMPORTANT NOTICE: Heavily WIP, expect anything

Table of Contents

Getting Started

A public testnet for the OMG Network is coming soon. However, if you are brave and want to test being a Plasma chain operator, read on!

Service start up using Docker Compose

This is the recommended method of starting the blockchain services, with the auxiliary services automatically provisioned through Docker.

Before attempting the start up please ensure that you are not running any services that are listening on the following TCP ports: 9656, 7434, 7534, 5000, 8545, 5432, 5433. All commands should be run from the root of the repo.

To bring the entire system up you will first need to bring in the compatible Geth snapshot of plasma contracts:

make init_test
docker-compose up

To bring only specific services up (eg: the childchain service, geth, etc...):

docker-compose up childchain geth ...

(Note: This will also bring up any services childchain depends on.)

To run a Watcher only, first make sure you sent an ENV variable called with INFURA_API_KEY with your api key and then run:

docker-compose -f docker-compose-watcher.yml up

Troubleshooting Docker

You can view the running containers via docker ps

If service start up is unsuccessful, containers can be left hanging which impacts the start of services on the future attempts of docker-compose up. You can stop all running containers via docker kill $(docker ps -q).

If the blockchain services are not already present on the host, docker-compose will attempt to pull the latest build coming from master. If you want Docker to use the latest commit from elixir-omg you can trigger a fresh build by building all three services with make docker-childchain, make docker-watcher and make docker-watcher_info.

Install on a Linux host

Follow the guide to install the Child Chain server, Watcher and Watcher Info.

Installing Plasma contract snapshots

To pull in the compatible snapshot for Geth:

make init_test

Testing & development

Docker building of source code and dependencies used to directly use common mix folders like _build and deps. To support workflows that switch between bare metal and Docker containers we've introduced _build_docker and deps_docker folders.

You can setup the docker environment to run testing and development tasks:

docker-compose -f docker-compose.yml -f run --rm --entrypoint bash elixir-omg

Once the shell has loaded, you can continue and run additional tasks.

Get the necessary dependencies for building:

mix deps.get

Pull in the compatible Plasma contracts snapshot:

make init_test

Quick test (no integration tests):

mix test

Longer-running integration tests (requires compiling contracts):

mix test --trace --only integration

For other kinds of checks, refer to the CI/CD pipeline ( or build steps (

To run a development iex REPL with all code loaded:

MIX_ENV=test iex -S mix run --no-start

Working with API Spec's

This repo contains gh-pages branch intended to host Swagger-based API specification. Branch gh-pages is totally diseparated from other development branches and contains just Slate generated page's files.

See gh-pages README for more details.

More details about the design and arhitecture

Details about the repository, code, arhitecture and design decisions are available here.

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