Core is a Kotlin based cryptocurrency exchange and matching engine from the OPEX project. This extendable and microservice project work as a vanilla core for running cryptocurrency exchanges.

Contents

• Build and Run
• Environment Variables
• Live Demo
• Architecture Overview
• How to Contribute
• License

Build and Run

You need to have Maven and Docker installed on your machine.

1. Clone the repository.
2. cd to the cloned directory.
3. Create .env file in the root directory of the project and add the required environment variables.
4. Run mvn clean install command to build the project.
5. After successful build, create docker images using docker compose -f docker-compose.yml -f docker-compose.override.yml -f docker-compose.build.yml -f docker-compose.local.yml build.
6. Run the project using docker compose -f docker-compose.yml -f docker-compose.override.yml -f docker-compose.build.yml -f docker-compose.local.yml up -d.
7. Now run docker ps command to see if services are healthy.

Environment Variables

APP_NAME=Opex-local
APP_BASE_URL=localhost:8080
PANEL_PASS=admin
BACKEND_USER=admin
KEYCLOAK_ADMIN_USERNAME=opex
KEYCLOAK_ADMIN_PASSWORD=hiopex
SMTP_PASS=x
API_KEY_CLIENT_SECRET=x
KEYCLOAK_FRONTEND_URL=http://localhost:8083/auth
KEYCLOAK_ADMIN_URL=http://localhost:8083/auth
KEYCLOAK_VERIFY_REDIRECT_URL=http://localhost:8080/verify
KEYCLOAK_FORGOT_REDIRECT_URL=http://localhost:8080/forgot
PREFERENCES=preferences-demo.yml
WHITELIST_REGISTER_ENABLED=true
WHITELIST_LOGIN_ENABLED=true
WALLET_BACKUP_ENABLED=false
OPEX_ADMIN_KEYCLOAK_CLIENT_SECRET=x
TAG=debug

Variable	Description
APP_NAME APP_BASE_URL	Application metadata used by Keycloak
PANEL_PASS	Vault's admin panel password
BACKEND_USER	Username used by services to access vault data. Also used as the username for Vault admin panel
KEYCLOAK_ADMIN_USERNAME	Username for Keycloak admin panel
KEYCLOAK_ADMIN_PASSWORD	Password for Keycloak admin panel
SMTP_PASS	SMTP password used by keycloak to send emails for various operations (e.g. user verification, reset password)
API_KEY_CLIENT_SECRET	In order to access the api key feature, please follow the steps below: 1. Go to Keycloak admin panel located at http://localhost:8083/auth/admin/master/console/#/realms/opex/clients 2. Login with the username and password you provided in the .env file (KEYCLOAK_ADMIN_USERNAME and KEYCLOAK_ADMIN_PASSWORD) 3. Go to clients section on the left menu 4. Click on opex-api-key client 5. In the credentials section, click on Regenerate Secret button 6. Copy the generated secret and paste it into this section
KEYCLOAK_FRONTEND_URL KEYCLOAK_ADMIN_URL KEYCLOAK_VERIFY_REDIRECT_URL KEYCLOAK_FORGOT_REDIRECT_URL	Replace localhost with your server's IP if you're not running on local machine. Do not change the rest.
PREFERENCES	Points to a file containing seed data used to by modules to initialize their databases. An example of this file is provided and is available inside the root directory (preferences-demo.yml). It's deprecated and will be removed soon
WHITELIST_REGISTER_ENABLED	Allows registration only for whitelisted emails
WHITELIST_LOGIN_ENABLED	Allows login only for whitelisted emails
WALLET_BACKUP_ENABLED	Enables wallet data backup to google drive folder. In order to use this feature, you need to have drive-key.json file (obtained from google drive API panel) in the root directory of project
OPEX_ADMIN_KEYCLOAK_CLIENT_SECRET	Ignore this for now. Will be removed soon
Tag	Labels locally built docker images

Live Demo

Deployed at app.opex.dev.

Architecture Overview

    graph LR
        USER_MANAGMENT(User Management)
        KAFKA(Kafka)
        ZOOKEEPER(Zookeeper)
        REDIS[(Redis)]
        ACCOUNTANT_POSTGRESQL[(PSQL)]
        REFERRAL_POSTGRESQL[(PSQL)]
        USER_MANAGMENT_POSTGRESQL[(PSQL)]
        WALLET_POSTGRESQL[(PSQL)]
        BC_GATEWAY_POSTGRESQL[(PSQL)]
        EVENTLOG_POSTGRESQL[(PSQL)]
        ACCOUNTANT(Accountant)
        API(API)
        WALLET(Wallet)
        MATCHING_ENGINE(Matching Engine)
        MATCHING_GATEWAY(Matching Gateway)
        REFERRAL(Referral)
        STORAGE(Storage)
        BC_GATEWAY(Blockchain Gateway)
        WEBSOCKET(Websocket)
        ADMIN(Admin)
        CAPTCHA(Captcha)
        EVENTLOG(Event Log)
                
        API-->MATCHING_GATEWAY
        API-->WALLET
        API-->REFERRAL
        API-->STORAGE
        API-->BC_GATEWAY
        API-->ACCOUNTANT
        
        MATCHING_ENGINE-->REDIS
        USER_MANAGMENT-->USER_MANAGMENT_POSTGRESQL
        BC_GATEWAY-->BC_GATEWAY_POSTGRESQL
        REFERRAL-->REFERRAL_POSTGRESQL
        WALLET-->WALLET_POSTGRESQL
        ACCOUNTANT-->ACCOUNTANT_POSTGRESQL
        EVENTLOG-->EVENTLOG_POSTGRESQL
        
        subgraph MESSAGING
            KAFKA
            ZOOKEEPER
        end
        
        subgraph MATCHING DOMAIN
            MATCHING_GATEWAY-->MATCHING_ENGINE
        end
        
        subgraph ACCOUNTANT DOMAIN
            ACCOUNTANT-->WALLET
            REFERRAL-->WALLET
        end
        
        subgraph DATA STORE
            BC_GATEWAY_POSTGRESQL
            REFERRAL_POSTGRESQL
            ACCOUNTANT_POSTGRESQL
            WALLET_POSTGRESQL
            USER_MANAGMENT_POSTGRESQL
            EVENTLOG_POSTGRESQL
            REDIS
        end

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How to Contribute

We want to make contributing to this project as easy and transparent as possible, and we are grateful to the developer for contributing bug fixes and improvements.

License

OPEX is MIT licensed.