fix: react - pt2. (#28)
This commit is contained in:
Richard Ramos
GitHub
parent
6cf911741b
commit
f4781943ec
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@ -0,0 +1,6 @@
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node_modules/
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.vscode/
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phoenix.db
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examples/
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test/
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.editorconfig
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@ -1,11 +1,34 @@
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#
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```
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In the parent folder:
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yarn link
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phoenix - react example
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===
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Simple application using a react observable component to receive a stream of emitted events. This app will deploy a test contract to **Ganache**.
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In the current folder:
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## Requirements
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- `ganache-cli`
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- `yarn` or `npm` installed.
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## Install
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In the parent folder, link the package with `yarn` or `npm`
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```
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yarn link
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```
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Then in the current folder link `phoenix`, and install the packages
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```
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yarn link phoenix
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yarn
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```
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## Usage
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In a terminal execute
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```
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ganache-cli
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```
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In a different session, execute
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```
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yarn run start
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```
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Browse the DApp in [http://localhost:3000](http://localhost:3000)
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*Note*: this is a simple example application that does not include error handling for the web3 connection. Be sure `ganache-cli` is running in `localhost:8545` before browsing the dapp.
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@ -1,138 +1,50 @@
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import React from "react";
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import Phoenix from "phoenix";
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import Web3 from "web3";
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import { web3, MyContract, onWeb3Available } from "./ethService";
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import { scan } from 'rxjs/operators';
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import MyComponentObserver from "./MyComponentObserver";
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const web3 = new Web3("ws://localhost:8545");
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let MyContractInstance;
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class App extends React.Component {
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state = {
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escrowObservable: null
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myEventObservable$: null
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};
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constructor(props) {
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super(props);
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this.EscrowContract = null;
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}
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componentDidMount() {
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(async () => {
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let accounts = await web3.eth.getAccounts();
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this.EscrowContract = await deployContract();
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await this.EscrowContract.methods.createEscrow(1, accounts[0], accounts[1]).send({ from: accounts[0] });
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await this.EscrowContract.methods.createEscrow(1, accounts[1], accounts[2]).send({ from: accounts[0] });
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await this.EscrowContract.methods.createEscrow(1, accounts[1], accounts[0]).send({ from: accounts[0] });
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await this.EscrowContract.methods.createEscrow(1, accounts[0], accounts[2]).send({ from: accounts[0] });
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// Verify if web3 connection is available
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onWeb3Available(async () => {
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MyContractInstance = await MyContract.deploy().send({ from: web3.eth.defaultAccount });
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const eventSyncer = new Phoenix(web3.currentProvider);
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await eventSyncer.init();
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eventSyncer.init().then(() => {
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const myEventObservable$ = eventSyncer.trackEvent(MyContractInstance, "MyEvent", {filter: {}, fromBlock: 1 });
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this.setState({
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escrowObservable: eventSyncer.trackEvent(this.EscrowContract, "Created", { filter: { buyer: accounts[0] }, fromBlock: 1 })
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// If you want to return all the events in an array, you can pipe the scan operator to the observable
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// const myEventObservable$ = eventSyncer.trackEvent(MyContractInstance, "MyEvent", {filter: {}, fromBlock: 1 })
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// .pipe(scan((accum, val) => [...accum, val], []));
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// Your observable component would receive the eventData as an array instead of an object
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this.setState({ myEventObservable$ });
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});
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});
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})();
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}
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createTrx = async () => {
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let accounts = await web3.eth.getAccounts();
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await this.EscrowContract.methods
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.createEscrow(Date.now(), accounts[0], accounts[1])
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.send({ from: accounts[0] });
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createTrx = () => {
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MyContractInstance.methods
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.myFunction()
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.send({ from: web3.eth.defaultAccount });
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};
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render() {
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const {escrowObservable} = this.state;
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return (
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<div>
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<button onClick={this.createTrx}>Create Trx</button>
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<MyComponentObserver escrow={escrowObservable} myCustomProperty="Test" />
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<button onClick={this.createTrx}>Create a Transaction</button>
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<MyComponentObserver eventData={this.state.myEventObservable$} />
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</div>
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);
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}
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}
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export default App;
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async function deployContract() {
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let accounts = await web3.eth.getAccounts();
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// pragma solidity >=0.4.22 <0.6.0;
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// contract Escrow {
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// event Created(uint indexed escrowId, address buyer, address seller);
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// function createEscrow(uint escrowId, address buyer, address seller) external {
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// emit Created(escrowId, buyer, seller);
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// }
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// }
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let abi = [
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{
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"constant": false,
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"inputs": [
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{
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"name": "escrowId",
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"type": "uint256"
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},
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{
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"name": "buyer",
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"type": "address"
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},
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{
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"name": "seller",
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"type": "address"
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}
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],
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"name": "createEscrow",
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"outputs": [],
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"payable": false,
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"stateMutability": "nonpayable",
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"type": "function"
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},
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{
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"anonymous": false,
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"inputs": [
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{
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"indexed": true,
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"name": "escrowId",
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"type": "uint256"
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},
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{
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"indexed": false,
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"name": "buyer",
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"type": "address"
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},
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{
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"indexed": false,
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"name": "seller",
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"type": "address"
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}
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],
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"name": "Created",
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"type": "event"
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}
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]
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var contract = new web3.eth.Contract(abi)
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let instance = await contract.deploy({
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data: '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',
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arguments: []
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}).send({
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from: accounts[0],
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gas: '4700000'
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})
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return instance
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}
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@ -1,17 +1,20 @@
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import React from "react";
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import { observe } from "phoenix/react";
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const MyComponent = props => {
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const { escrow, myCustomProperty } = props;
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if(!escrow) return <p>Loading...</p>;
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return (
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<ul>
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<li>
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{escrow.buyer} {escrow.seller} - <b>EscrowID:{escrow.escrowId}</b>{" "}
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<small>{myCustomProperty}</small>
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</li>
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</ul>
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);
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const MyComponent = ({ eventData }) => {
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// Handle initial state when no data is available
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if (!eventData) {
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return <p>No data</p>;
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}
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console.log("Data received", eventData);
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return <ul>
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<li><b>someValue: </b> {eventData.someValue}</li>
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<li><b>anotherValue: </b> {eventData.anotherValue}</li>
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</ul>;
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};
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// MyComponent will now observe any observable prop it receives
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// and update its state whenever the observable emits an event
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export default observe(MyComponent);
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import Web3 from 'web3';
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export const web3 = new Web3("ws://localhost:8545");
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let web3AvailableCB;
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export const onWeb3Available = (cb) => {
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web3AvailableCB = cb;
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}
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web3.eth.getAccounts().then(async accounts => {
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web3.eth.defaultAccount = accounts[0];
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if(web3AvailableCB){
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web3AvailableCB();
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}
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/*SimpleStorageContract.deploy().send({ from: web3.eth.defaultAccount }).then(instance => {
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SimpleStorage = instance;
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});*/
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});
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// pragma solidity ^0.5.0;
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//
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// contract MyContract {
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// event MyEvent(uint someValue, bytes32 anotherValue);
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//
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// function myFunction() public {
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// uint a = block.timestamp * block.number; // Just to have a pseudo random value
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// bytes32 b = keccak256(abi.encodePacked(a));
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//
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// emit MyEvent(a, b);
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// }
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// }
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const abi = [
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{
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"constant": false,
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"inputs": [],
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"name": "myFunction",
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"outputs": [],
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"payable": false,
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"stateMutability": "nonpayable",
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"type": "function"
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},
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{
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"anonymous": false,
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"inputs": [
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{
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"indexed": false,
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"name": "someValue",
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"type": "uint256"
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},
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{
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"indexed": false,
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"name": "anotherValue",
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"type": "bytes32"
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}
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],
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"name": "MyEvent",
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"type": "event"
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}
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];
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const data = "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";
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export const MyContract = new web3.eth.Contract(abi, {data, gas: "470000"});
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