Loading Web3, accounts, and contract...
;
}
return (
Good to Go!
Your Truffle Box is installed and ready.
Smart Contract Example
If your contracts compiled and migrated successfully, below will show
a stored value of 5 (by default).
Try changing the value stored on line 40 of App.js.
The stored value is: {this.state.storageValue}
);
}
}
export default App;
================================================
FILE: chapter-6/fundraiser/client/src/App.test.js
================================================
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
it('renders without crashing', () => {
const div = document.createElement('div');
ReactDOM.render(
// to customize your Truffle configuration!
contracts_build_directory: path.join(__dirname, "client/src/contracts"),
networks: {
develop: {
port: 8545
}
}
};
================================================
FILE: chapter-7/fundraiser/LICENSE
================================================
The MIT License (MIT)
Copyright (c) 2018 Truffle
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
================================================
FILE: chapter-7/fundraiser/client/.gitignore
================================================
# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.js
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*
================================================
FILE: chapter-7/fundraiser/client/README.md
================================================
This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
## Available Scripts
In the project directory, you can run:
### `npm start`
Runs the app in the development mode.React App
You need to enable JavaScript to run this app.
================================================
FILE: chapter-7/fundraiser/client/public/manifest.json
================================================
{
"short_name": "React App",
"name": "Create React App Sample",
"icons": [
{
"src": "favicon.ico",
"sizes": "64x64 32x32 24x24 16x16",
"type": "image/x-icon"
}
],
"start_url": ".",
"display": "standalone",
"theme_color": "#000000",
"background_color": "#ffffff"
}
================================================
FILE: chapter-7/fundraiser/client/src/App.css
================================================
.App {
text-align: center;
}
.App-logo {
animation: App-logo-spin infinite 20s linear;
height: 40vmin;
}
.App-header {
background-color: #282c34;
min-height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
font-size: calc(10px + 2vmin);
color: white;
}
.App-link {
color: #61dafb;
}
@keyframes App-logo-spin {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}
================================================
FILE: chapter-7/fundraiser/client/src/App.js
================================================
import React, { Component } from "react";
import SimpleStorageContract from "./contracts/SimpleStorage.json";
import getWeb3 from "./utils/getWeb3";
import "./App.css";
class App extends Component {
state = { storageValue: 0, web3: null, accounts: null, contract: null };
componentDidMount = async () => {
try {
// Get network provider and web3 instance.
const web3 = await getWeb3();
// Use web3 to get the user's accounts.
const accounts = await web3.eth.getAccounts();
// Get the contract instance.
const networkId = await web3.eth.net.getId();
const deployedNetwork = SimpleStorageContract.networks[networkId];
const instance = new web3.eth.Contract(
SimpleStorageContract.abi,
deployedNetwork && deployedNetwork.address,
);
// Set web3, accounts, and contract to the state, and then proceed with an
// example of interacting with the contract's methods.
this.setState({ web3, accounts, contract: instance }, this.runExample);
} catch (error) {
// Catch any errors for any of the above operations.
alert(
`Failed to load web3, accounts, or contract. Check console for details.`,
);
console.error(error);
}
};
runExample = async () => {
const { accounts, contract } = this.state;
// Stores a given value, 5 by default.
await contract.methods.set(5).send({ from: accounts[0] });
// Get the value from the contract to prove it worked.
const response = await contract.methods.get().call();
// Update state with the result.
this.setState({ storageValue: response });
};
render() {
if (!this.state.web3) {
return Loading Web3, accounts, and contract...
;
}
return (
Good to Go!
Your Truffle Box is installed and ready.
Smart Contract Example
If your contracts compiled and migrated successfully, below will show
a stored value of 5 (by default).
Try changing the value stored on line 40 of App.js.
The stored value is: {this.state.storageValue}
);
}
}
export default App;
================================================
FILE: chapter-7/fundraiser/client/src/App.test.js
================================================
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
it('renders without crashing', () => {
const div = document.createElement('div');
ReactDOM.render(
// to customize your Truffle configuration!
contracts_build_directory: path.join(__dirname, "client/src/contracts"),
networks: {
develop: {
port: 8545
}
}
};
================================================
FILE: chapter-9/README.md
================================================
This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
## Available Scripts
In the project directory, you can run:
### `npm start`
Runs the app in the development mode.React App
You need to enable JavaScript to run this app.
================================================
FILE: chapter-9/public/manifest.json
================================================
{
"short_name": "React App",
"name": "Create React App Sample",
"icons": [
{
"src": "favicon.ico",
"sizes": "64x64 32x32 24x24 16x16",
"type": "image/x-icon"
}
],
"start_url": ".",
"display": "standalone",
"theme_color": "#000000",
"background_color": "#ffffff"
}
================================================
FILE: chapter-9/src/App.css
================================================
body {
margin: 0 !important;
}
.App {
text-align: center;
}
.donation-input-container {
display: flex;
}
.withdrawal-button {
margin-left: 10px;
}
.receipt-header {
border-bottom: 1px solid gray;
}
.receipt-container {
text-align: center;
}
.receipt-info {
display: flex;
padding: 50px;
justify-content: space-between;
}
.donation-receipt-link {
color: inherit;
text-decoration: none;
}
.main-container {
margin: 20px;
}
.donation-list {
margin-top: 10px;
margin-bottom: 10px;
display: flex;
justify-content: space-between;
}
.fundraiser-card-container {
display: inline-flex;
width: 250px;
height: 250px;
margin: 20px;
}
.MuiTextField-root {
display: block !important;
}
.MuiInputBase-root {
width: 300px !important;
margin-left: 3px;
}
.App-logo {
animation: App-logo-spin infinite 20s linear;
height: 40vmin;
}
.App-header {
background-color: #282c34;
min-height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
font-size: calc(10px + 2vmin);
color: white;
}
.App-link {
color: #61dafb;
}
@keyframes App-logo-spin {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}
.nav-link {
color: inherit;
text-decoration: none;
margin-right: 15px;
}
.nav-link:hover,
.nav-link:active,
.nav-link:visited {
color: black;
text-decoration: none;
}
================================================
FILE: chapter-9/src/App.js
================================================
import React, { useState, useEffect } from "react";
import FactoryContract from "./contracts/Factory.json";
import getWeb3 from "./utils/getWeb3";
import { makeStyles } from '@material-ui/core/styles';
import AppBar from '@material-ui/core/AppBar';
import Toolbar from '@material-ui/core/Toolbar';
import Typography from '@material-ui/core/Typography';
import { BrowserRouter as Router, Route, Link, NavLink } from "react-router-dom";
import NewFundraiser from './NewFundraiser'
import Home from './Home'
import Receipts from './Receipts'
import "./App.css";
const App = () => {
const [state, setState] = useState({web3: null, accounts: null, contract: null});
const [storageValue, setStorageValue] = useState(0);
useEffect(() => {
const init = async() => {
try {
// Get network provider and web3 instance.
const web3 = await getWeb3();
// Use web3 to get the user's accounts.
const accounts = await web3.eth.getAccounts();
// Get the contract instance.
const networkId = await web3.eth.net.getId();
const deployedNetwork = FactoryContract.networks[networkId];
const instance = new web3.eth.Contract(
FactoryContract.abi,
deployedNetwork && deployedNetwork.address,
);
// Set web3, accounts, and contract to the state, and then proceed with an
setState({web3, accounts, contract: instance});
} catch(error) {
// Catch any errors for any of the above operations.
alert(
`Failed to load web3, accounts, or contract. Check console for details.`,
);
console.error(error);
}
}
init();
}, []);
const useStyles = makeStyles({
root: {
flexGrow: 1,
},
});
const classes = useStyles();
const runExample = async () => {
const { accounts, contract } = state;
};
return (
)
}
export default App;
================================================
FILE: chapter-9/src/App.test.js
================================================
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
it('renders without crashing', () => {
const div = document.createElement('div');
ReactDOM.render(
${donation.donationAmount}
)
})
}
const withdrawalFunds = async () => {
await contract.methods.withdraw().send({
from: accounts[0],
})
alert('Funds Withdrawn!')
}
return (
Donate to {fundName}
{bio}
Donate
My donations
{renderDonationsList()}
Cancel
{isOwner &&
Withdrawal
}
{fundName}
{bio}
Total Donations: ${totalDonations}
View More
)
}
export default FundraiserCard;
================================================
FILE: chapter-9/src/Home.js
================================================
import React, { useState, useEffect } from "react";
import { makeStyles } from '@material-ui/core/styles';
import FundraiserCard from './FundraiserCard'
import getWeb3 from "./utils/getWeb3";
import FactoryContract from "./contracts/Factory.json";
import Web3 from 'web3'
const useStyles = makeStyles(theme => ({
button: {
margin: theme.spacing(1),
},
input: {
display: 'none',
},
}));
const Home = () => {
const classes = useStyles();
const [ contract, setContract] = useState(null)
const [ accounts, setAccounts ] = useState(null)
const [ funds, setFunds ] = useState([])
const web3 = new Web3(new Web3.providers.HttpProvider('http://localhost:8545'))
useEffect(() => {
init()
}, []);
const init = async () => {
try {
const networkId = await web3.eth.net.getId();
const deployedNetwork = FactoryContract.networks[networkId];
const accounts = await web3.eth.getAccounts();
const instance = new web3.eth.Contract(
FactoryContract.abi,
deployedNetwork && deployedNetwork.address,
);
setContract(instance)
setAccounts(accounts)
const funds = await instance.methods.fundraisers().call()
setFunds(funds)
}
catch(error) {
alert(
`Failed to load web3, accounts, or contract. Check console for details.`,
);
console.error(error);
}
}
const displayFundraisers = () => {
return funds.map((fundraiser) => {
return (
{displayFundraisers()}
)
}
export default Home;
================================================
FILE: chapter-9/src/NewFundraiser.js
================================================
import React, { useState, useEffect } from "react";
import FormControl from '@material-ui/core/FormControl';
import { makeStyles } from '@material-ui/core/styles';
import Button from '@material-ui/core/Button';
import MenuItem from '@material-ui/core/MenuItem';
import TextField from '@material-ui/core/TextField';
import getWeb3 from "./utils/getWeb3";
import FactoryContract from "./contracts/Factory.json";
import Web3 from 'web3'
const useStyles = makeStyles(theme => ({
container: {
display: 'flex',
flexWrap: 'wrap',
},
textField: {
marginLeft: theme.spacing(1),
marginRight: theme.spacing(1),
},
dense: {
marginTop: theme.spacing(2),
},
menu: {
width: 200,
},
}));
const NewFundraiser = () => {
const [labelWidth, setLabelWidth] = React.useState(0);
const labelRef = React.useRef(null);
const classes = useStyles();
const [ web3, setWeb3 ] = useState(null)
useEffect(() => {
const init = async() => {
try {
const web3 = await getWeb3();
const networkId = await web3.eth.net.getId();
const deployedNetwork = FactoryContract.networks[networkId];
const accounts = await web3.eth.getAccounts();
const instance = new web3.eth.Contract(
FactoryContract.abi,
deployedNetwork && deployedNetwork.address,
);
setWeb3(web3)
setContract(instance)
setAccounts(accounts)
} catch(error) {
alert(
`Failed to load web3, accounts, or contract. Check console for details.`,
);
console.error(error);
}
}
init();
}, []);
const [ name, setFundraiserName ] = useState(null)
const [ website, setFundraiserWebsite ] = useState(null)
const [ description, setFundraiserDescription ] = useState(null)
const [ image, setImage ] = useState(null)
const [ address, setAddress ] = useState(null)
const [ custodian, setCustodian ] = useState(null)
const [ contract, setContract] = useState(null)
const [ accounts, setAccounts ] = useState(null)
const handleSubmit = async () => {
const imageURL = image
const bio = description
const beneficiary = address
const transaction = await contract.methods.createFundraiser(
name,
website,
imageURL,
bio,
beneficiary,
custodian
).send({ from: accounts[0] })
alert('Successfully created fundraiser')
}
return (
Create A New Fundraiser
Name
setFundraiserName(e.target.value)}
variant="outlined"
inputProps={{ 'aria-label': 'bare' }}
/>
Website
setFundraiserWebsite(e.target.value)}
variant="outlined"
inputProps={{ 'aria-label': 'bare' }}
/>
Description
setFundraiserDescription(e.target.value)}
variant="outlined"
inputProps={{ 'aria-label': 'bare' }}
/>
Image
setImage(e.target.value)}
variant="outlined"
inputProps={{ 'aria-label': 'bare' }}
/>
Address
setAddress(e.target.value)}
variant="outlined"
inputProps={{ 'aria-label': 'bare' }}
/>
Custodian
setCustodian(e.target.value)}
variant="outlined"
inputProps={{ 'aria-label': 'bare' }}
/>
Submit
)
}
export default NewFundraiser;
================================================
FILE: chapter-9/src/Receipts.js
================================================
import React, { useState, useEffect } from "react";
const Receipts = (props) => {
const [ donation, setDonation ] = useState(null)
const [ fundName, setFundName ] = useState(null)
const [ date, setDate ] = useState(null)
useEffect(() => {
const { donation, date, fund } = props.location.state
const formattedDate = new Date(parseInt(date))
setDonation(donation)
setDate(formattedDate.toString())
setFundName(fund)
}, []);
return (
Thank you for your donation to {fundName}
Date of Donation: {date}
Donation Value: ${donation}
)
}
export default Receipts;
================================================
FILE: chapter-9/src/contracts/Factory.json
================================================
{
"contractName": "Factory",
"abi": [
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "fundraiser",
"type": "address"
},
{
"indexed": true,
"name": "name",
"type": "string"
}
],
"name": "LogFundraiserCreated",
"type": "event"
},
{
"constant": false,
"inputs": [
{
"name": "name",
"type": "string"
},
{
"name": "url",
"type": "string"
},
{
"name": "imageURL",
"type": "string"
},
{
"name": "bio",
"type": "string"
},
{
"name": "beneficiary",
"type": "address"
},
{
"name": "custodian",
"type": "address"
}
],
"name": "createFundraiser",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "fundraisersCount",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "fundraisers",
"outputs": [
{
"name": "fs",
"type": "address[]"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}
],
"metadata": "{\"compiler\":{\"version\":\"0.5.8+commit.23d335f2\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"constant\":true,\"inputs\":[],\"name\":\"fundraisers\",\"outputs\":[{\"name\":\"fs\",\"type\":\"address[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"fundraisersCount\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"name\",\"type\":\"string\"},{\"name\":\"url\",\"type\":\"string\"},{\"name\":\"imageURL\",\"type\":\"string\"},{\"name\":\"bio\",\"type\":\"string\"},{\"name\":\"beneficiary\",\"type\":\"address\"},{\"name\":\"custodian\",\"type\":\"address\"}],\"name\":\"createFundraiser\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"fundraiser\",\"type\":\"address\"},{\"indexed\":true,\"name\":\"name\",\"type\":\"string\"}],\"name\":\"LogFundraiserCreated\",\"type\":\"event\"}],\"devdoc\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/randallkanna/Documents/dev/book/fundraiser/contracts/Factory.sol\":\"Factory\"},\"evmVersion\":\"petersburg\",\"libraries\":{},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/randallkanna/Documents/dev/book/fundraiser/client/node_modules/@openzeppelin/contracts/ownership/Ownable.sol\":{\"keccak256\":\"0xf79fb10e8235770eb4aea7249034076a3cc9f9119ad944fc48705bae9c9d20dc\",\"urls\":[\"bzzr://d12a11272051eb6586de8f7e0a82c04a98c9984ce8b2a6cf1ee439f65aba29a9\"]},\"/Users/randallkanna/Documents/dev/book/fundraiser/contracts/Factory.sol\":{\"keccak256\":\"0xc191a38221745e86be7454a147164100b00a612403359084ce4bc5d825b18124\",\"urls\":[\"bzzr://aad8ace28c5063db8bb8748350dc7e41ce036df200f891c72799f54f7f0e96a0\"]},\"/Users/randallkanna/Documents/dev/book/fundraiser/contracts/Fundraiser.sol\":{\"keccak256\":\"0x19055c641f5ff96a84149a81b8950c1387518095d8ce4451b951bc03d46d5c20\",\"urls\":[\"bzzr://2b8f024402ccb06c57f6a57a77f446a65b4a98be633351a4aa39aacd8c00a355\"]}},\"version\":1}",
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"stateVariable": false,
"storageLocation": "memory",
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"typeString": "contract Fundraiser[]"
},
"typeName": {
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"id": 174,
"name": "Fundraiser",
"nodeType": "UserDefinedTypeName",
"referencedDeclaration": 519,
"src": "872:10:1",
"typeDescriptions": {
"typeIdentifier": "t_contract$_Fundraiser_$519",
"typeString": "contract Fundraiser"
}
},
"id": 175,
"length": null,
"nodeType": "ArrayTypeName",
"src": "872:12:1",
"typeDescriptions": {
"typeIdentifier": "t_array$_t_contract$_Fundraiser_$519_$dyn_storage_ptr",
"typeString": "contract Fundraiser[]"
}
},
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}
],
"src": "871:24:1"
},
"scope": 215,
"src": "829:267:1",
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}
],
"scope": 216,
"src": "63:1035:1"
}
],
"src": "0:1099:1"
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"networks": {
"5777": {
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"links": {},
"address": "0xB7780C9AD3ef38bb4C8B48fab37Ef176603E7787",
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},
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"updatedAt": "2019-09-02T16:31:37.475Z",
"devdoc": {
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},
"userdoc": {
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}
}
================================================
FILE: chapter-9/src/contracts/Fundraiser.json
================================================
{
"contractName": "Fundraiser",
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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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{
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================================================
FILE: chapter-9/src/contracts/Migrations.json
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================================================
FILE: chapter-9/src/index.css
================================================
body {
margin: 0;
padding: 0;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
"Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
code {
font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
monospace;
}
================================================
FILE: chapter-9/src/index.js
================================================
import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter } from 'react-router-dom'
import App from './App';
ReactDOM.render((
//
//
), document.getElementById('root'))
================================================
FILE: chapter-9/src/serviceWorker.js
================================================
// This optional code is used to register a service worker.
// register() is not called by default.
// This lets the app load faster on subsequent visits in production, and gives
// it offline capabilities. However, it also means that developers (and users)
// will only see deployed updates on subsequent visits to a page, after all the
// existing tabs open on the page have been closed, since previously cached
// resources are updated in the background.
// To learn more about the benefits of this model and instructions on how to
// opt-in, read http://bit.ly/CRA-PWA
const isLocalhost = Boolean(
window.location.hostname === 'localhost' ||
// [::1] is the IPv6 localhost address.
window.location.hostname === '[::1]' ||
// 127.0.0.1/8 is considered localhost for IPv4.
window.location.hostname.match(
/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
)
);
export function register(config) {
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
// The URL constructor is available in all browsers that support SW.
const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
if (publicUrl.origin !== window.location.origin) {
// Our service worker won't work if PUBLIC_URL is on a different origin
// from what our page is served on. This might happen if a CDN is used to
// serve assets; see https://github.com/facebook/create-react-app/issues/2374
return;
}
window.addEventListener('load', () => {
const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
if (isLocalhost) {
// This is running on localhost. Let's check if a service worker still exists or not.
checkValidServiceWorker(swUrl, config);
// Add some additional logging to localhost, pointing developers to the
// service worker/PWA documentation.
navigator.serviceWorker.ready.then(() => {
console.log(
'This web app is being served cache-first by a service ' +
'worker. To learn more, visit http://bit.ly/CRA-PWA'
);
});
} else {
// Is not localhost. Just register service worker
registerValidSW(swUrl, config);
}
});
}
}
function registerValidSW(swUrl, config) {
navigator.serviceWorker
.register(swUrl)
.then(registration => {
registration.onupdatefound = () => {
const installingWorker = registration.installing;
if (installingWorker == null) {
return;
}
installingWorker.onstatechange = () => {
if (installingWorker.state === 'installed') {
if (navigator.serviceWorker.controller) {
// At this point, the updated precached content has been fetched,
// but the previous service worker will still serve the older
// content until all client tabs are closed.
console.log(
'New content is available and will be used when all ' +
'tabs for this page are closed. See http://bit.ly/CRA-PWA.'
);
// Execute callback
if (config && config.onUpdate) {
config.onUpdate(registration);
}
} else {
// At this point, everything has been precached.
// It's the perfect time to display a
// "Content is cached for offline use." message.
console.log('Content is cached for offline use.');
// Execute callback
if (config && config.onSuccess) {
config.onSuccess(registration);
}
}
}
};
};
})
.catch(error => {
console.error('Error during service worker registration:', error);
});
}
function checkValidServiceWorker(swUrl, config) {
// Check if the service worker can be found. If it can't reload the page.
fetch(swUrl)
.then(response => {
// Ensure service worker exists, and that we really are getting a JS file.
const contentType = response.headers.get('content-type');
if (
response.status === 404 ||
(contentType != null && contentType.indexOf('javascript') === -1)
) {
// No service worker found. Probably a different app. Reload the page.
navigator.serviceWorker.ready.then(registration => {
registration.unregister().then(() => {
window.location.reload();
});
});
} else {
// Service worker found. Proceed as normal.
registerValidSW(swUrl, config);
}
})
.catch(() => {
console.log(
'No internet connection found. App is running in offline mode.'
);
});
}
export function unregister() {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready.then(registration => {
registration.unregister();
});
}
}
================================================
FILE: chapter-9/src/utils/getWeb3.js
================================================
import Web3 from "web3";
const getWeb3 = () =>
new Promise((resolve, reject) => {
// Wait for loading completion to avoid race conditions with web3 injection timing.
window.addEventListener("load", async () => {
// Modern dapp browsers...
if (window.ethereum) {
const web3 = new Web3(window.ethereum);
try {
// Request account access if needed
await window.ethereum.enable();
// Acccounts now exposed
resolve(web3);
} catch (error) {
reject(error);
}
}
// Legacy dapp browsers...
else if (window.web3) {
// Use Mist/MetaMask's provider.
const web3 = window.web3;
console.log("Injected web3 detected.");
resolve(web3);
}
// Fallback to localhost; use dev console port by default...
else {
const provider = new Web3.providers.HttpProvider(
"http://127.0.0.1:8545"
);
const web3 = new Web3(provider);
console.log("No web3 instance injected, using Local web3.");
resolve(web3);
}
});
});
export default getWeb3;