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Merge pull request #63 from embarklabs/feat/graphql-example
feat: graphql example with react
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Diff for: ‎examples/react-graphql-example1/README.md

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subspace - react graphql example
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===
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Simple application using graphql queries to receive a stream of events
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This app will deploy a test contract to **Ganache**.
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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, install, build and link the package with `yarn` or `npm`
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```
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yarn
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yarn build:dev
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yarn link
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```
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Then in the current folder link `@embarklabs/subspace`, and install the packages
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```
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yarn link "@embarklabs/subspace"
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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 deploy
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```
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And then:
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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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### node-gyp problems
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node-gyp can cause problems, because it requires a C++ compiler.
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If you do have problems caused by it, first follow the installation steps for your OS [here](https://github.com/nodejs/node-gyp#installation).
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If you still have problems and are on Windows, try the following:
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- run `npm config set msvs_version 2015` before `npm install`
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- Repair Windows Build tools that the node-gyp doc made you install. If it tells you to remove a conflicting version do it. After the repair succeeded, reboot.

Diff for: ‎examples/react-graphql-example1/deploy.js

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const Web3 = require("web3");
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const web3 = new Web3("ws://localhost:8545");
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const fs = require("fs-extra");
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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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{
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"internalType": "string",
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"name": "title",
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"type": "string"
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}
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],
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"name": "createProduct",
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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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"constant": false,
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"inputs": [
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{
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"internalType": "uint256",
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"name": "productId",
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"type": "uint256"
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},
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{
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"internalType": "string",
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"name": "title",
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"type": "string"
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}
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],
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"name": "editProduct",
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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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"constant": true,
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"inputs": [
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{
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"internalType": "uint256",
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"name": "",
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"type": "uint256"
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}
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],
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"name": "products",
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"outputs": [
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{
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"internalType": "string",
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"name": "title",
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"type": "string"
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},
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{
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"internalType": "uint256",
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"name": "latestRating",
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"type": "uint256"
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}
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],
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"payable": false,
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"stateMutability": "view",
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"type": "function"
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},
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{
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"constant": false,
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"inputs": [
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{
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"internalType": "uint256",
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"name": "productId",
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"type": "uint256"
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},
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{
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"internalType": "uint256",
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"name": "rating",
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"type": "uint256"
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}
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],
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"name": "rateProduct",
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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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"inputs": [],
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"payable": false,
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"stateMutability": "nonpayable",
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"type": "constructor"
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},
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{
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"payable": true,
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"stateMutability": "payable",
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"type": "fallback"
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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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"internalType": "uint256",
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"name": "productId",
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"type": "uint256"
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}
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],
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"name": "newProduct",
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"type": "event"
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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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"internalType": "uint256",
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"name": "productId",
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"type": "uint256"
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},
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{
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"indexed": false,
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"internalType": "uint256",
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"name": "rating",
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"type": "uint256"
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}
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],
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"name": "Rating",
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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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const MyContract = new web3.eth.Contract(abi, {data, gas: "800000"});
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(async () => {
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if (!web3.eth.defaultAccount) {
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const accounts = await web3.eth.getAccounts();
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web3.eth.defaultAccount = accounts[0];
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}
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const instance = await MyContract.deploy().send({ from: web3.eth.defaultAccount });
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let address = instance.options.address;
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console.dir("deployment done!");
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fs.writeJsonSync("./src/contract.json", { address, abi });
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console.dir("artifact written to src/contract.json")
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process.exit(0)
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})()

Diff for: ‎examples/react-graphql-example1/package.json

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{
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"name": "observables",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"fs-extra": "^8.1.0",
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"graphql-tag": "^2.10.1",
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"graphql-tools": "^4.0.6",
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"react": "^16.9.0",
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"react-dom": "^16.9.0",
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"react-scripts": "3.1.1",
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"reactive-graphql": "^4.0.1",
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"rxjs": "^6.5.2",
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"web3": "^1.2.1"
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},
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"scripts": {
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"start": "react-scripts start",
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"deploy": "node deploy.js",
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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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},
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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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}

Diff for: ‎examples/react-graphql-example1/public/index.html

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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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<title>React App</title>
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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>

Diff for: ‎examples/react-graphql-example1/src/App.js

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import React from "react";
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import Subspace from "@status-im/subspace";
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import { $average, $latest } from "@embarklabs/subspace";
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import { makeExecutableSchema } from "graphql-tools";
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import { graphql } from "reactive-graphql";
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import { map, scan } from "rxjs/operators";
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import web3 from "./web3";
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import { abi, address } from "./contract.json";
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let Product;
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class App extends React.Component {
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state = {
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userRating: 0,
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averageRating: 0,
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last5Ratings: [],
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filteredRatings: []
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};
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async componentDidMount() {
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const subspace = new Subspace(web3.currentProvider);
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await subspace.init();
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Product = subspace.contract({ abi, address });
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const typeDefs = `
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type Query {
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averageRating: Float!
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last5Ratings: [Int!]
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filteredRatings(gte: Int): [Int!]
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}
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`;
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const rating$ = Product.events.Rating.track()
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.map("rating")
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.pipe(map(x => parseInt(x)));
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const resolvers = {
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Query: {
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averageRating: () => rating$.pipe($average()),
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last5Ratings: () => rating$.pipe($latest(5)),
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filteredRatings: (a, conditions) => {
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const gte = (conditions && conditions.gte) || 0;
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return rating$.pipe(
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scan((accum, val) => {
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if (val >= gte) {
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return [...accum, val];
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} else {
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return accum;
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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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const schema = makeExecutableSchema({ typeDefs, resolvers });
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const summaryQuery = `
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query {
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averageRating
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last5Ratings
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}
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`;
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graphql(schema, summaryQuery).subscribe(
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({ data: { averageRating, last5Ratings } }) => {
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this.setState({ averageRating, last5Ratings });
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}
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);
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const filterRatingsQuery = `
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query {
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filteredRatings(gte: 3)
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}
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`;
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graphql(schema, filterRatingsQuery).subscribe(
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({ data: { filteredRatings } }) => {
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this.setState({ filteredRatings });
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}
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);
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}
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rateProduct = async () => {
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let accounts = await web3.eth.getAccounts();
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await Product.methods
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.rateProduct(0, this.state.userRating)
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.send({ from: accounts[0] });
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};
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render() {
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return (
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<div>
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<button onClick={this.rateProduct}>Rate Product</button>
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<input
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type="number"
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value={this.state.userRating}
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onChange={evt =>
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this.setState({ userRating: parseInt(evt.target.value) })
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}
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/>
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<ul>
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<li><b>average rating: </b> {this.state.averageRating}</li>
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<li><b>last 5 ratings: </b> {(this.state.last5Ratings || []).join(', ')}</li>
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<li><b>all ratings greater than 2:</b> {(this.state.filteredRatings || []).join(', ')}</li>
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</ul>
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</div>
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);
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}
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}
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export default App;

Diff for: ‎examples/react-graphql-example1/src/MyContract.js

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import web3 from './web3';
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import {abi, address} from './contract.json'
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const MyContract = new web3.eth.Contract(abi, {from: web3.eth.default, gas: "800000"});
5+
MyContract.options.address = address;
6+
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MyContract.getInstance = async () => {
8+
if (!web3.eth.defaultAccount) {
9+
const accounts = await web3.eth.getAccounts();
10+
web3.eth.defaultAccount = accounts[0];
11+
}
12+
MyContract.options.from = web3.eth.defaultAccount;
13+
return MyContract;
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}
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export default MyContract;

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