@energyweb/exchange

Exchange

Description

The Exchange package is a NestJS application that provides backend services to manage the Exchange's functionality (account management and buying, selling and transferring Energy Attribute Certificates through an order book system).

It is a component of Energy Web Origin's Trade SDK.

Documentation

• Exchange
• Trade SDK

Contributing Guidelines

See contributing.md

Energy Web Decentralized Operating System

EW-Origin is a component of the Energy Web Decentralized Operating System (EW-DOS).

The purpose of EW-DOS is to develop and deploy an open and decentralized digital operating system for the energy sector in support of a low-carbon, customer-centric energy future.

We develop blockchain technology, full-stack applications and middleware packages that facilitate participation of Distributed Energy Resources on the grid and create open market places for transparent and efficient renewable energy trading.

• To learn about more about the EW-DOS tech stack, see our documentation

For a deep-dive into the motivation and methodology behind our technical solutions, read our White Papers:

• Energy Web White Paper on Vision and Purpose
• Energy Web White Paper on Technology Detail

Connect with Energy Web

• Twitter
• Discord
• Telegram

License

This project is licensed under the MIT License - see the LICENSE file for details

Development

Exchange project is currently not meant to be run as a separate nest application. In order to run exchange project please refer to https://github.com/energywebfoundation/origin/tree/master/packages/origin-backend-app

Default TypeOrm configuration requires running PostgreSQL database. The detailed config with .env parameters is:

DB_HOST      - default 'localhost'
DB_PORT      - default 5432
DB_USERNAME  - default 'postgres',
DB_PASSWORD  - default 'postgres',
DB_DATABASE  - default 'origin',

or

DATABASE_URL  - postgres://{user}:{password}@{host}:{port}/{database}

Using TypeORM migrations

Exchange project uses TypeORM mechanism to perform SQL data migrations. For detailed information please refer to https://github.com/typeorm/typeorm/blob/master/docs/migrations.md

• yarn typeorm:run to update DB to latest exchange tables schema
• yarn typeorm:migrate SampleMigrationName to create new migration file based on the changes in the code entities

Development flow:

• run yarn typeorm:run - to apply latest migrations
• apply changes in the entities, like change the variable name or type
• run yarn typeorm:migrate LastestChanges...
• inspect newly created migration in /migrations folder
• run yarn typeorm:run to apply newly created migration

Warning:

Existing migration files from /migration folder should never be edited after being committed.

PostgreSQL installation using Docker

docker pull postgres
docker run --name origin-postgres -e POSTGRES_PASSWORD=postgres -d -p 5432:5432 postgres

pgAdmin

docker pull dpage/pgadmin4
docker run -p 80:80 \
    -e 'PGADMIN_DEFAULT_EMAIL=[e-mail]' \
    -e 'PGADMIN_DEFAULT_PASSWORD=SuperSecret' \
    -d dpage/pgadmin4

SQL dump

example/example.sql contains a dump of database filled in with the example data:

1. User with id=1 as a buyer (owner of the bid orders)
2. User with id=2 as a seller (owner of the ask orders), with confirmed deposit of 100MWh (100000000)
3. 3 open bids with prices 90,85,75 for {"deviceType":["Solar;Photovoltaic;Classic silicon"],"location":["Thailand;Central;Nakhon Pathom"],"deviceVintage":{"year":2016}}
4. 3 open asks with prices 110,120,130 for {"deviceType":["Solar;Photovoltaic;Classic silicon"],"location":["Thailand;Central;Nakhon Pathom"],"deviceVintage":{"year":2016}}
5. 3 open bids with prices 79,78,77 for {"deviceType":["Wind"],"location":["Thailand;Northeast"]
6. 3 open asks with prices 80,85,86 for {"deviceType":["Wind;Onshore"],"location":["Thailand;Northeast;Nakhon Ratchasima"],"deviceVintage":{"year":2014}}
7. 1 filled ask
8. 1 partially filled bid
9. 1 trade

In order to deploy the data please use pgadmin or psql or similar tools to import *.sql tool.

Notice that you might need to remove previously imported data in case of PK violations. Use

TRUNCATE "account","asset","demand","order","trade","transfer" CASCADE

with caution.

This can be used for fast integrations and testing

Swagger

Swagger endpoint can be found at

http://localhost:3033/api