Crypto-Exchange / Coin-Exchange

Maybe The best open source core code exchange in the entire net, the architecture/code quality is visible.

I think this may be the best choice for you to build an exchange or secondary development

Statement 1: I have been working in the new company. I will take the time to update some descriptive things here so that everyone can compile, build, and develop
Statement 2: The APP source code and the trading robot source code are not open source (provided for a fee), if necessary, email: 837385225@qq.com

I am a chinese，so chinese is my mother language, But I can also use both English and Japanese to communicate with you.

Introduction

This project is a bitcoin exchange based on Java (SpringCloud) | BTC exchange | ETH exchange | digital currency exchange | trading platform | matching trading engine. This project is based on the development of Spring Cloud microservices, which can be used to build and secondary development digital currency exchanges, and has a complete system component.

• Match trading engine.
• Background management (back-end + front-end)
• Frontend (transaction page, event page, personal center, etc.)）
• Native Android APP source code
• Native Apple APP source code
• Currency wallet RPC source code
• Multi Language Support（Simple Chinese、English）

System architecture overview

Just draw a few sketches, just look at it。。。

Overall structure

Logical architecture

Deployment architecture

Dependencies

System demonstration video

PC front end (user web end)：https://gitee.com/cexchange/CoinExchange/attach_files

Mobile APP：https://gitee.com/cexchange/CoinExchange/attach_files

Management background：https://gitee.com/cexchange/CoinExchange/attach_files

Development Reference

Development Reference Document：https://gitee.com/cexchange/CoinExchange/blob/master/DEVELOP.md

Manage background screenshots：https://gitee.com/cexchange/CoinExchange/tree/master/09_DOC/管理后台截图

About server configuration and deployment

If you want to build an exchange system on your computer or cloud server, I have prepared some basic deployment manuals. Of course, installing software on linux/unix is not a simple matter. You need to have a certain Linux basics and command line skills, but also the courage and patience to solve problems, I wish you success!

• Server Configuration Reference Manual
• Installation Basic Environment Manual
• Service deployment script
• Install MySql Manual
• Install Redis Manual
• Install Zookeeper Manual
• Install Kafka Manual
• nstall Mongodb manual
• Building a BTC wallet node manual
• Building ETH Wallet Node Manual
• Manual of Building USDT Wallet Node

About SpringCloud

Spring Cloud is an ordered collection of frameworks. It uses Spring Boot's development convenience to subtly simplify the development of distributed system infrastructure, such as service discovery registration, configuration center, message bus, load balancing, circuit breaker, data monitoring, etc., can be done using Spring Boot's development style One click to start and deploy. Spring Cloud does not repeat the manufacturing of wheels. It just combines the mature and practical service frameworks developed by various companies. The re-encapsulation through the Spring Boot style shields the complex configuration and implementation principles, and finally gives the development The author has left a set of distributed system development kits that are simple to understand, easy to deploy, and easy to maintain. In general, a complete Spring Cloud framework should be as shown in the following figure:

If you are unfamiliar with Spring Cloud, you can simply learn about Spring Cloud related tutorials first, so that you will come back to this project and it will be easier to get started. As a reminder, because the Springcloud framework diagram is a complete architecture, we will tailor some content appropriately during development to make development and deployment faster, so there are some discrepancies.

About Matchmaking Trading Engine

The system uses memory matching for the transaction queue, Kafka is used for matching order information transmission, MongoDB persists the order transaction details, and MySQL records the overall order transaction. Among them, the 01_Framework/Exchange project is mainly responsible for memory matching, and the 01_Framework/Market project is mainly responsible for order transaction persistence, market generation, market push and other services, including:

• K-line data, the intervals are: 1 minute, 5 minutes, 15 minutes, 30 minutes, 1 hour, 1 day, 1 week, 1 month
• Market depth data for all trading pairs
• The latest prices of all trading pairs
• Recently traded pairs

Modes supported by memory matching transactions

• Matching of limit order and limit order
• Matching market orders and limit orders
• Matching limit orders with market orders
• Matching market orders with market orders

Limit & Market Order Processing Logic

Note: This picture is a long time ago, the logic in the latest code is more complicated

Other features supported by match engine

In addition to the ordinary matching functions of limit and market prices, the matching trading engine of this system also introduces an active transaction mode. By setting the trading start time, initial issuance volume, initial issuance price, and activity of trading pairs (such as BTC/USDT) Modes and other parameters can formulate a wealth of matching transaction modes to meet different matching modes.

for example

The exchange is expected to launch the trading pair AAA/USDT at 12:00:00 on August 8, 2020, but as a newly launched currency, how can it work without activity? The project party or the exchange decided to come up with 10,000 AAA at a price of 0.0001USDT (market price: 0.0005) for everyone to snap up. The system supports the setting of such activities.

In addition, if the project party or the exchange decides to take out 10,000 AAAs to issue at the price of 0.0001USDT, I don’t want everyone to snap up, but hope that all users who recharge USDT can divide 10,000 AAAs on average. This system also supports the setting of this activity .

to sum up

n short, this system supports a highly customized matching mode. At the same time, you can also develop your own matching transaction mode, just by modifying the matching logic in the Exchange project.

About the technical composition

• Backend development：Spring、SpringMVC、SpringData、SpringCloud、SpringBoot
• DataBase：Mysql、Mongodb
• Other：redis、kafka、Ali OSS、Tencent Captcha
• Frontend：Vue、iView、less

Demo website

https://www.bizzan.com

This was done for the customer, but later the customer stopped operating, so this website was left, because I don’t have server permissions, so this website may not be accessible at any time.

Building a test site requires purchasing several cloud servers, which cost a lot, so I did not set up a test station myself, but the system is complete and has passed the commercial and practical operation test for nearly a year.

About trading robots
Trading robots are automatic trading programs that can automatically trade based on external market conditions, so that the exchange's trading pair prices are consistent with the external, preventing losses caused by some users "moving bricks".

==============================================

System operating environment

1. Centos 6.8
2. MySQL 5.5.16
3. Redis-x64-3.2.100
4. Mongodb 3.6.13
5. kafka_2.11-2.2.1
6. nginx-1.16.0
7. JRE 8u241
8. JDK 1.8
9. Vue
10. Zookeeper

Recommended configuration for production environment

File directory description

00_framework

└─———admin Background management API

└─———bitrade-job Task management（Empty）

└─———chat OTC Chat

└─———cloud SpringCloud Eureka

└─———core Core

└─———exchange match trading

└─———exchange-api order API

└─———exchange-core order core

└─———jar Other lib

└─———market market API、K-line service

└─———otc-api OTC trade API

└─———otc-core OTC core

└─———sql SQL script

└─———ucenter-api user API

└─———wallet wallet

01_wallet_rpc

└─———bitcoin

└─———bsv

└─———btm

└─———eos

└─———erc-eusdt

└─———erc-token（可对接各种ERC20币种）

└─———eth

└─———ltc

└─———usdt

02_App_Android

03_App_IOS

04_Web_Admin

05_Web_Front

Use tutorial

1. Prepare the mysql database and create a database named "xxxx"
2. Prepare redis cache database
3. Prepare kafka streaming environment (first configure to run zookper, then configure to run kafka)
4. Prepare mongodb database environment, create users admin, xxxx, create bitrade database
5. Prepare Alibaba Cloud OSS (modify the place to be configured in the project)
6. Prepare nginx and modify the configuration file (optional, need to be configured for official launch)
7. Modify the configuration file in the framework code to prepare the environment configuration parameters
8. Compile to generate jar executable file
9. Run cloud.jar (microservices registration center)
10. Run exchange.jar (match trading engine)
11. Run market.jar (Quote Center, need to wait for Exchange.jar to fully start)
12. Run ucenter.jar (User Center)
13. Run other modules (wallet.jar, chat.jar, otc-api.jar, etc.)
14. Open mysql and import the xxxxxxx.sql file in the sql folder in the framework code. Note that if the trigger sql reports an error, you need to add a trigger for the wallet table
15. Run the front-end vue project
16. Run the back-end vue project
17. Run wallet RPC
18. Run the automated trading robot program (the code in this part is not uploaded, but it does not affect)
19. Run the Admin project (the service does not depend on other services, so you can just run this project and directly view the background)

Technical Support

This digital currency trading system is a project developed by my company for an exchange. The exchange has c