xdairelay.js

"use strict";
const express = require('express');
const helmet = require('helmet');
const app = express();
const fs = require('fs');
require('dotenv').config()
const ContractLoader = function(contractList,web3){
  let contracts = []
  for(let c in contractList){
    try{
      let abi = require("./src/contracts/"+contractList[c]+".abi.js")
      let address = require("./src/contracts/"+contractList[c]+".address.js")
      console.log(contractList[c],address,abi.length)
      contracts[contractList[c]] = new web3.eth.Contract(abi,address)
      console.log("contract")
      contracts[contractList[c]].blockNumber = require("./src/contracts/"+contractList[c]+".blocknumber.js")
      console.log("@ Block",contracts[contractList[c]].blockNumber)
    }catch(e){console.log(e)}
  }
  return contracts
}

var bodyParser = require('body-parser')
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
app.use(helmet());
var cors = require('cors')
app.use(cors())
let contracts;
var Web3 = require('web3');
let relayHttpProvider = fs.readFileSync("relayhttpprovider.env").toString()

let transactions = {}

const HDWalletProvider = require("truffle-hdwallet-provider")
let DESKTOPMINERACCOUNT = 0

let web3
if(relayHttpProvider.indexOf("localhost")>=0||relayHttpProvider.indexOf("dai.poa.network")>=0){
  web3 = new Web3(
     new HDWalletProvider(
       process.env.mnemonic,
       relayHttpProvider
     )
 );
}else{
  web3 = new Web3();
  web3.setProvider(new web3.providers.HttpProvider(relayHttpProvider));
}


let accounts
web3.eth.getAccounts().then((_accounts)=>{
  accounts=_accounts
  console.log("ACCOUNTS",accounts)
})

console.log("LOADING CONTRACTS")
contracts = ContractLoader(["Links"],web3);


app.get('/', (req, res) => {
  res.setHeader('Access-Control-Allow-Origin', '*');
  console.log("/")
  res.set('Content-Type', 'application/json');
  res.end(JSON.stringify({hello:"world"}));

});

app.get('/miner', (req, res) => {
  res.setHeader('Access-Control-Allow-Origin', '*');
  console.log("/miner")
  res.set('Content-Type', 'application/json');
  res.end(JSON.stringify({address:accounts[DESKTOPMINERACCOUNT]}));
});

app.post('/link', async (req, res) => {
  res.setHeader('Access-Control-Allow-Origin', '*');
  console.log("/link",req.body)


  let validClaim = await contracts.Links.methods.isClaimValid(req.body.id,req.body.sig,req.body.claimHash,req.body.dest).call()

  if(!validClaim){
    console.log("INVALID CLAIM!!!!")
    res.set('Content-Type', 'application/json');
    res.end(JSON.stringify({invalid:"claim"}));
  }else{
    console.log("CLAIM IS VALID...")

    //console.log("dApp reward estimation: ",req.body.reward)
    //web3.eth.getGasPrice()
  //  .then((gasPrice) => {
    //  gasPrice = gasPrice < 500000000 ? 1000000000 : gasPrice; // Fix for xDai 0 Txs avg

  //    console.log("Relay gas estimation: ",gasAmount)
    //  console.log("PARAMS",{from: accounts[DESKTOPMINERACCOUNT],gas: parseInt(gasAmount)+10000,gasPrice: parseInt(gasPrice)+500000000})
      /// OLD CODE BUT REVERTING FOR NOW, (gasAmount+10000)*(gasPrice+500000000)
      contracts.Links.methods.claim(req.body.id,req.body.sig,req.body.claimHash,req.body.dest)
      .send({from: accounts[DESKTOPMINERACCOUNT],gas: 240000,gasPrice: 1010101010},
        (error, transactionHash)=>{
          console.log("TX CALLBACK",error,transactionHash)
          res.set('Content-Type', 'application/json');
          res.end(JSON.stringify({transactionHash:transactionHash}));
        }
      )
      .on('error',(err,receiptMaybe)=>{
        console.log("TX ERROR",err,receiptMaybe)
      })
      .on('transactionHash',(transactionHash)=>{
        console.log("TX HASH",transactionHash)
      })
      .on('receipt',(receipt)=>{
        console.log("TX RECEIPT",receipt)
      })
      .then((receipt)=>{
        console.log("TX THEN",receipt)
      })
      .catch((error) => {
        console.log(error); //Tx promise
      });

    /*})
    .catch((error) => {
      console.log(error); //Get Gas price promise
    });*/
  }




});

app.listen(18462);
console.log(`http listening on 18462`);