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server.js
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server.js
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require("dotenv").config();
const app = require('express')();
const Web3 = require('web3');
const web3Provider = new Web3.providers.HttpProvider('http://localhost:8545')
const web3 = new Web3(web3Provider);
const bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(bodyParser.raw());
app.use(bodyParser.urlencoded({extended: true}));
const FROM_ACCOUNT = "0xa363810c1eda270f2cb6ed88ddaa6fea5f4116e2"
const PollContractABI = require('./solidityFiles/Poll.json');
const TruffleContract = require('truffle-contract');
const DEFAULT_GAS = 4000000;
let PollContract = TruffleContract(PollContractABI);
PollContract.setProvider(web3Provider);
function createPoll (title, proposition, endTime, votesRequired, votesAllowed, msgSender) {
let myInstance;
return PollContract.new(
title,
proposition,
endTime,
votesRequired,
votesAllowed,
{ from: msgSender, gas: DEFAULT_GAS })
.then((instance) => {
console.log("Instance Address: " + instance.address)
_logPollInfo(instance.address);
return instance.address;
})
.catch(function (error) {
console.trace("THIS THE ERROR: " + error);
console.log("Promise Rejected2");
});
};
function _logPollInfo (contractAddress) {
return PollContract.at(contractAddress)._title.call()
.then((title) => {
console.log(title)
return PollContract.at(contractAddress)._proposition.call()
})
.then((proposition) => {
console.log(proposition);
return PollContract.at(contractAddress)._endTime.call()
})
.then((endTime) => {
console.log(endTime.toNumber())
return PollContract.at(contractAddress)._votesRequired.call()
})
.then((votesRequired) => {
console.log(votesRequired.toNumber())
return PollContract.at(contractAddress)._votesAllowed.call()
})
.then((votesAllowed) => {
console.log(votesAllowed.toNumber())
})
}
let pollAddress;
app.post('/createPoll', (req, res) => {
createPoll('Boba', 'Should we get boba?', 1508691600, 6, 1, '0xa363810c1eda270f2cb6ed88ddaa6fea5f4116e2')
.then((address) => {
pollAddress = address;
res.send(address);
}).catch(function (err) {
console.error("The promise was rejected.");
console.trace(err);
});
});
const EventEmitter = require('events');
const eventEmitter = new EventEmitter();
const voters = [];
const votes = {
"yes": 0,
"no": 0,
"voters": voters
};
app.get('/newAccount', (req, res) => {
const responseObject = web3.eth.accounts.create()
res.send(responseObject)
});
eventEmitter.on('vote', (voter, vote) => {
switch(vote) {
case 0: {
votes.yes += 1;
break;
}
case 1: {
votes.no += 1;
}
}
voters.push(voter);
});
const WebSocket = require('ws');
const wss = new WebSocket.Server({port: 3001});
wss.on('connection', ws => {
ws.on('message', message => {
console.log('Received: %s', message);
});
ws.send('Connection opened');
});
var pollInstance;
app.get('/votes', (req, res) => {
PollContract.at(pollAddress).then(instance => {
pollInstance = instance;
res.send(`Successfully deployed poll.`);
});
});
app.post('/send/:info', require('./verifyIdentity').send);
if (pollInstance) {
let transactions = pollInstance.Voted({fromBlock: "latest"});
transactions.watch((error, result) => {
if (error) {
console.error(error);
} else {
eventEmitter.emit('vote', result.voterAddress, result.voteType);
}
});
};
app.post('/vote', (req, res) => {
PollContract.at(pollAddress).then(instance => {
instance.vote(req.body.voteType, { from: FROM_ACCOUNT, gas: DEFAULT_GAS });
res.status(200).send('Successfully voted.');
}).catch(error => {
console.error(error);
res.status(404).send('Could not vote.');
});
});
app.delete('/votes', (req, res) => {
wss.broadcast = () => {
wss.clients.forEach(client => {
if (client.readyState === WebSocket.OPEN) {
client.send(votes);
}
});
};
wss.broadcast = () => {
wss.clients.forEach(client => {
if (client.readyState === WebSocket.OPEN) {
client.close();
}
});
};
res.status(200).send(`Successfully closed poll.`);
});
process.on('exit', () =>{
wss.close();
});
const server = app.listen(3000, () => {
console.log(`App is listening on port ${server.address().port}...`);
});