rezendi/index1.js

## index1.js
const express = require('express');
const helmet = require('helmet');

const Web3 = require('web3');
const contractAddress = undefined; // TODO
const abi = [{"constant":false,"inputs":[{"name":"prizeId","type":"uint256"},{"name":"geohash","type":"bytes10"},{"name":"_metadata","type":"string"}],"name":"placePrize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"prizeId","type":"uint256"},{"name":"geohash","type":"bytes10"}],"name":"claimPrize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"prizes","outputs":[{"name":"id","type":"uint256"},{"name":"owner","type":"address"},{"name":"geohash","type":"bytes10"},{"name":"metadata","type":"string"},{"name":"placedAt","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"}];

const app = express();
const port = process.env.PORT || 8801;
app.use(helmet());

app.get('/', (req, response) => {
  var html = "<HTML><HEAD><TITLE>Webthereum Tutorial</TITLE></HEAD><BODY>";
  html += "<FORM action='prize'><SELECT name='prizeId'>";
  for (var i=1; i<=10; i++) {
    html += "<OPTION>"+i;
  }
  html += "</SELECT><INPUT type='submit'></FORM>";
  html += "</BODY></HTML>";
  response.send(html);
});

// Display the prize data, if any
app.get('/prize', (req, response) => {
  get_prize_data(req.query.prizeId, function(err, res) {
    if (err) {
      response.json( {"err": err} );
    } else {
      response.json( {"res": res} );
    }
  });
});

// error handling: for now just console.log
app.use((err, request, response, next) => {
  console.log(err);
  response.status(500).send('Something broke! '+ JSON.stringify(err));
});

app.listen(port, (err) => {
  if (err) {
    return console.log('something bad happened', err);
  }
  console.log(`server is listening on ${port}`);
});

// Get prize data
function get_prize_data(prizeId, callback) {
  web3 = new Web3(new Web3.providers.HttpProvider("https://rinkeby.infura.io/"));
  var contract = new web3.eth.Contract(abi, contractAddress);
  contract.methods.prizes(prizeId).call(function(error, result) {
    if (error) {
      console.log('error', error);
      callback(error, null);
    } else {
      console.log('result', result);
      callback(null, result);
    }
  })
  .catch(function(error) {
    console.log('call error ' + error);
    callback(error, null);
  });
};
	const express = require('express');
	const helmet = require('helmet');

	const Web3 = require('web3');
	const contractAddress = undefined; // TODO
	const abi = [{"constant":false,"inputs":[{"name":"prizeId","type":"uint256"},{"name":"geohash","type":"bytes10"},{"name":"_metadata","type":"string"}],"name":"placePrize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"prizeId","type":"uint256"},{"name":"geohash","type":"bytes10"}],"name":"claimPrize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"prizes","outputs":[{"name":"id","type":"uint256"},{"name":"owner","type":"address"},{"name":"geohash","type":"bytes10"},{"name":"metadata","type":"string"},{"name":"placedAt","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"}];

	const app = express();
	const port = process.env.PORT \|\| 8801;
	app.use(helmet());

	app.get('/', (req, response) => {
	var html = "<HTML><HEAD><TITLE>Webthereum Tutorial</TITLE></HEAD><BODY>";
	html += "<FORM action='prize'><SELECT name='prizeId'>";
	for (var i=1; i<=10; i++) {
	html += "<OPTION>"+i;
	}
	html += "</SELECT><INPUT type='submit'></FORM>";
	html += "</BODY></HTML>";
	response.send(html);
	});

	// Display the prize data, if any
	app.get('/prize', (req, response) => {
	get_prize_data(req.query.prizeId, function(err, res) {
	if (err) {
	response.json( {"err": err} );
	} else {
	response.json( {"res": res} );
	}
	});
	});

	// error handling: for now just console.log
	app.use((err, request, response, next) => {
	console.log(err);
	response.status(500).send('Something broke! '+ JSON.stringify(err));
	});

	app.listen(port, (err) => {
	if (err) {
	return console.log('something bad happened', err);
	}
	console.log(`server is listening on ${port}`);
	});

	// Get prize data
	function get_prize_data(prizeId, callback) {
	web3 = new Web3(new Web3.providers.HttpProvider("https://rinkeby.infura.io/"));
	var contract = new web3.eth.Contract(abi, contractAddress);
	contract.methods.prizes(prizeId).call(function(error, result) {
	if (error) {
	console.log('error', error);
	callback(error, null);
	} else {
	console.log('result', result);
	callback(null, result);
	}
	})
	.catch(function(error) {
	console.log('call error ' + error);
	callback(error, null);
	});
	};