@energyweb/exchange NPM

Exchange package provides the order book based exchange functionality for the certificates issued by issuer package. The major difference between classic (asset, time, price) order book system is the product based matching engine, providing the ability to create custom matching rules.

Main features

Order book matching engine for time, price and product matching
ERC 1155 / ERC 1888 compatible
Supply / Demand modules

Trading product concept

Definition

Product defines the characteristics of the given producing device as well as buyers preferences . Currently it's represented as:

export class Product {
    public deviceType?: string[];

    public location?: string[];

    public deviceVintage?: number;
}

Where

deviceType - describes the type of the device for e.g. using I-REC types
location - describes the location of the the device for e.g. can be multi-level like Country->Region->Province
deviceVintage - describes the vintage of the device for e.g. the start year of the device operation

For a producing device all fields are mandatory.

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',

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=user@domain.com' \
    -e 'PGADMIN_DEFAULT_PASSWORD=SuperSecret' \
    -d dpage/pgadmin4

SQL dump

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

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

@everything-registry/sub-chunk-290 @energyweb/origin-backend-irec-app @energyweb/origin-backend-app @energyweb/migrations-irec @energyweb/exchange-io-erc1888 @energyweb/exchange-irec

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