Liteflow-test

This project is a technical skills test

A basic service to read and expose new NFT sales on opensea

Usage

git clone https://github.com/Sceat/liteflow-test
cd liteflow-test
npm i

Create a .env file

POSTGRE_ENDPOINT=
WS_RPC_ENDPOINT=

npm start

Run the Graphql API

npm run graphql -- \
  --connection $POSTGRE_ENDPOINT \
  --jwt-secret $JWT_SECRET

Tests

npm test

Thoughts process

This service is quite basic, not a lot of thoughts to give,

Listening to a seaport event
Transforming the values into a storable object
- Computing the paid amount seems a bit tricky, not much time to deep dive into it but when the ItemType is not 0 (not ETH) then retrieving the monetary value of the spentItem require more context
Storing the object

CREATE TABLE IF NOT EXISTS sales (
  tx_hash CHAR(66), -- length of 64 prefixed with 0X
  seller CHAR(42),
  buyer CHAR(42),
  token_id NUMERIC(78), -- numeric(78) is an uint256
  collection CHAR(42),
  sold_quantity NUMERIC(78),
  amount_paid NUMERIC(78)
);

Having to use typescript is quite a drawback on the simplicity of node, i didn't manage to make NYC coverage works along with ESM and TS