Add react hooks demo (#77)
This commit is contained in:
acolytec3
GitHub
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This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
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# Subspace Defi Dashboard Debo
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This demo app is a simple DeFi dashboard that uses [Subspace](https://github.com/embarklabs/subspace) to track the `EthPurchase` event for the Uniswap DAI contract to show the most recent trades and the DAI->ETH exchange rate over time.
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{
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"name": "subspace-demo",
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"version": "0.1.0",
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"private": true,
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"homepage": "https://acolytec3.github.io/subspace-demo",
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"dependencies": {
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"@embarklabs/subspace": "^2.0.2",
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"@embarklabs/subspace-react": "^1.0.2",
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"@testing-library/jest-dom": "^4.2.4",
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"@testing-library/react": "^9.3.2",
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"@testing-library/user-event": "^7.1.2",
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"gh-pages": "^2.2.0",
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"grommet": "^2.11.1",
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"grommet-icons": "^4.4.0",
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"react": "^16.13.0",
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"react-bootstrap": "^1.0.0-beta.17",
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"react-dom": "^16.13.0",
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"react-scripts": "3.4.0",
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"rxjs": "^6.5.4",
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"styled-components": "^5.0.1",
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"web3": "^1.2.6"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"eject": "react-scripts eject",
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"predeploy": "npm run build",
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"deploy": "gh-pages -d build"
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},
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"eslintConfig": {
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"extends": "react-app"
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},
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"browserslist": {
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"production": [
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">0.2%",
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"not dead",
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"not op_mini all"
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],
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"development": [
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"last 1 chrome version",
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"last 1 firefox version",
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"last 1 safari version"
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]
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}
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}
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta name="theme-color" content="#000000" />
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<meta
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name="description"
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content="Web site created using create-react-app"
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/>
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<link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
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<!--
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manifest.json provides metadata used when your web app is installed on a
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user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
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-->
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<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
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<!--
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Notice the use of %PUBLIC_URL% in the tags above.
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It will be replaced with the URL of the `public` folder during the build.
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Only files inside the `public` folder can be referenced from the HTML.
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Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
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work correctly both with client-side routing and a non-root public URL.
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Learn how to configure a non-root public URL by running `npm run build`.
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-->
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500" />
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<title>Subspace DeFi Dashboard Demo</title>
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<style type="text/css">
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body {
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margin: 0;
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}
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</style>
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<div id="root"></div>
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<!--
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This HTML file is a template.
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If you open it directly in the browser, you will see an empty page.
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You can add webfonts, meta tags, or analytics to this file.
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The build step will place the bundled scripts into the <body> tag.
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To begin the development, run `npm start` or `yarn start`.
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To create a production bundle, use `npm run build` or `yarn build`.
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-->
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</body>
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</html>
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{
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"short_name": "React App",
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"name": "Create React App Sample",
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"icons": [
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{
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"src": "favicon.ico",
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"sizes": "64x64 32x32 24x24 16x16",
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"type": "image/x-icon"
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},
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{
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"src": "logo192.png",
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"type": "image/png",
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"sizes": "192x192"
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},
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{
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"src": "logo512.png",
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"type": "image/png",
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"sizes": "512x512"
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}
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],
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"start_url": ".",
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"display": "standalone",
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"theme_color": "#000000",
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"background_color": "#ffffff"
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}
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# https://www.robotstxt.org/robotstxt.html
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User-agent: *
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Disallow:
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import React, {useEffect, useState} from 'react';
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import {
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Box,
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Grommet,
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DataTable,
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Text
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} from 'grommet';
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import { pipe } from 'rxjs';
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import {$latest} from '@embarklabs/subspace';
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import { useSubspace } from '@embarklabs/subspace-react';
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import exchangeABI from './contract/exchange_abi.json'
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import Web3 from 'web3';
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const web3 = new Web3("https://cloudflare-eth.com");
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const dai = new web3.eth.Contract(exchangeABI, '0x2a1530C4C41db0B0b2bB646CB5Eb1A67b7158667');
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const theme = {
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global: {
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font: {
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family: 'Roboto',
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size: '18px',
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height: '20px'
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}
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}
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};
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function App(props) {
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const subspace = useSubspace();
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const daiContract = subspace.contract(dai);
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const [txnObserver, setObservable] = useState();
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const [last5Observable, setlast5Observable] = useState();
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const [latestBlock, setBlock] = useState();
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const [last5, setLast5] = useState([]);
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//Trade details object for calculating exchange rate
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function TradeDetails(tokensSold, ethBought) {
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this.tokensSold = web3.utils.fromWei(tokensSold);
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this.ethBought = web3.utils.fromWei(ethBought);
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this.exchangeRate = this.tokensSold / this.ethBought;
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}
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//Effect hook to define subspace observables
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useEffect(() => {
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web3.eth.getBlockNumber().then((block) => setBlock(block));
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if (typeof(latestBlock) != "number")
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return;
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const EthPurchased$ = daiContract.events.EthPurchase.track({
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fromBlock: latestBlock - 50
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});
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const last5$ = EthPurchased$.pipe($latest(5));
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setObservable(EthPurchased$);
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setlast5Observable(last5$)
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},[latestBlock])
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//Effect hook to set up subscription for Uniswap DAI Contract EthPurchase event
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useEffect(() => {
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if ((txnObserver === undefined) || (typeof latestBlock != "number")) {
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return;
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}
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txnObserver.subscribe((trade) => {
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console.log(trade);
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});
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return () => { txnObserver.unsubscribe(); }
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}, [txnObserver, latestBlock]);
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//Effect hook to source last 5 trades from EthPurchase observableyarn
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useEffect(() => {
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if (last5Observable === undefined) {
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return;
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}
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last5Observable.subscribe((fiveTrades) => {
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const prices = fiveTrades.map(trade => {
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const txnDetails = new TradeDetails(trade.tokens_sold, trade.eth_bought);
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return {'block': trade.blockNumber, 'rate': txnDetails.exchangeRate}
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});
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setLast5(prices);
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});
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return () => { last5Observable.unsubscribe(); }
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}, [last5Observable]);
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return (
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<Grommet theme={theme}>
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<AppBar>Subspace DeFi Dashboard Demo</AppBar>
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<Box align="center">
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<Text margin="medium" textAlign="center">Average Exchange Rate on 5 latest Uniswap DAI->ETH trades = {
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(last5.reduce((a,b) => a + b.rate, 0) / last5.length).toFixed(6)
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}</Text>
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</Box>
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<Box align="center"><Text textAlign="center"> Last 5 DAI -> Eth Trades</Text></Box>
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<Tradelist last5={last5}/> </Grommet>
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);
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}
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const AppBar = (props) => (
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<Box tag='header' direction='row' align='center' alignContent="center" background='brand'
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pad={
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{
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left: 'medium',
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right: 'small',
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vertical: 'small'
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}
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}
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elevation='medium'
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style={
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{zIndex: '1'}
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}
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{...props}/>
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);
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const Tradelist = (props) => (
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<Box direction='column' align='center' pad="medium">
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<DataTable columns={
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[
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{
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property: 'block',
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header: <Text>Block</Text>,
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}, {
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property: 'rate',
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header: <Text>ETH/DAI</Text>,
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primary: true
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}
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]
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}
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data={
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props.last5
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}/>
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</Box>
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)
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export default App;
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import React from 'react';
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import ReactDOM from 'react-dom';
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import App from './App';
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import * as serviceWorker from './serviceWorker';
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import { SubspaceProvider } from '@embarklabs/subspace-react';
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import Web3 from 'web3';
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const web3 = new Web3("https://cloudflare-eth.com");
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const rootElement = document.getElementById('root')
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ReactDOM.render(
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<SubspaceProvider web3={web3}>
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<App />
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</SubspaceProvider>,
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rootElement
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);
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// If you want your app to work offline and load faster, you can change
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// unregister() to register() below. Note this comes with some pitfalls.
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// Learn more about service workers: https://bit.ly/CRA-PWA
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serviceWorker.unregister();
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// This optional code is used to register a service worker.
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// register() is not called by default.
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// This lets the app load faster on subsequent visits in production, and gives
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// it offline capabilities. However, it also means that developers (and users)
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// will only see deployed updates on subsequent visits to a page, after all the
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// existing tabs open on the page have been closed, since previously cached
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// resources are updated in the background.
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// To learn more about the benefits of this model and instructions on how to
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// opt-in, read https://bit.ly/CRA-PWA
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const isLocalhost = Boolean(
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window.location.hostname === 'localhost' ||
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// [::1] is the IPv6 localhost address.
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window.location.hostname === '[::1]' ||
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// 127.0.0.0/8 are considered localhost for IPv4.
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window.location.hostname.match(
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/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
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)
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);
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export function register(config) {
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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// The URL constructor is available in all browsers that support SW.
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
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if (publicUrl.origin !== window.location.origin) {
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// Our service worker won't work if PUBLIC_URL is on a different origin
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// from what our page is served on. This might happen if a CDN is used to
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// serve assets; see https://github.com/facebook/create-react-app/issues/2374
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return;
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}
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window.addEventListener('load', () => {
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
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if (isLocalhost) {
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// This is running on localhost. Let's check if a service worker still exists or not.
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checkValidServiceWorker(swUrl, config);
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// Add some additional logging to localhost, pointing developers to the
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// service worker/PWA documentation.
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navigator.serviceWorker.ready.then(() => {
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console.log(
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'This web app is being served cache-first by a service ' +
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'worker. To learn more, visit https://bit.ly/CRA-PWA'
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);
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});
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} else {
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// Is not localhost. Just register service worker
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registerValidSW(swUrl, config);
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}
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});
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}
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}
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function registerValidSW(swUrl, config) {
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navigator.serviceWorker
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.register(swUrl)
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.then(registration => {
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registration.onupdatefound = () => {
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const installingWorker = registration.installing;
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if (installingWorker == null) {
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return;
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}
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installingWorker.onstatechange = () => {
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if (installingWorker.state === 'installed') {
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if (navigator.serviceWorker.controller) {
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// At this point, the updated precached content has been fetched,
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// but the previous service worker will still serve the older
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// content until all client tabs are closed.
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console.log(
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'New content is available and will be used when all ' +
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'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
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);
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// Execute callback
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if (config && config.onUpdate) {
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config.onUpdate(registration);
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}
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} else {
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// At this point, everything has been precached.
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// It's the perfect time to display a
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// "Content is cached for offline use." message.
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console.log('Content is cached for offline use.');
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// Execute callback
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if (config && config.onSuccess) {
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config.onSuccess(registration);
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}
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}
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}
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};
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};
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})
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.catch(error => {
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console.error('Error during service worker registration:', error);
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});
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}
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function checkValidServiceWorker(swUrl, config) {
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// Check if the service worker can be found. If it can't reload the page.
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fetch(swUrl, {
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headers: { 'Service-Worker': 'script' }
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})
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.then(response => {
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// Ensure service worker exists, and that we really are getting a JS file.
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const contentType = response.headers.get('content-type');
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if (
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response.status === 404 ||
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(contentType != null && contentType.indexOf('javascript') === -1)
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) {
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// No service worker found. Probably a different app. Reload the page.
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navigator.serviceWorker.ready.then(registration => {
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registration.unregister().then(() => {
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window.location.reload();
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});
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});
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} else {
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// Service worker found. Proceed as normal.
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registerValidSW(swUrl, config);
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}
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})
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.catch(() => {
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console.log(
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'No internet connection found. App is running in offline mode.'
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);
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});
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}
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export function unregister() {
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if ('serviceWorker' in navigator) {
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navigator.serviceWorker.ready
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.then(registration => {
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registration.unregister();
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})
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.catch(error => {
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console.error(error.message);
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});
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}
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}
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// jest-dom adds custom jest matchers for asserting on DOM nodes.
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// allows you to do things like:
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// expect(element).toHaveTextContent(/react/i)
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// learn more: https://github.com/testing-library/jest-dom
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import '@testing-library/jest-dom/extend-expect';
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