mec/src/utils/utils.js

This package helps to create multi-layer chains upon Ethereum Network. Also it provides easy to use nodejs API to any of consortium network and helps to manage all of them at the same time

const keys = require('../appStructure/keyElements.js').keyElements,
      fs   = require('fs'),
      Q_config = require('../Quorum/config');

function Storage(chain) {
  return new Promise((resolve,reject)=>{
    fs.access(`./Blockchain/${chain}`, (err)=>{
      if(!err) {
        console.log(`[INFO] Blockchain storage for "${chain}" network found\n`);
        resolve(true);
      }
      else {
        console.log('[WARN] Blockchain data folder not found' + '\n');
        reject(false);
      }
    });
  });
}

const asciiToHex = function (str) {
  return keys.infura.utils.asciiToHex(str);
}

const fromHex = function(hexx) {
  // return keys.infura.toAscii(str)
  const hex = hexx.toString();//force conversion
  let str = '';
  for (let i = 0; i < hex.length; i += 2)
    str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
  return str.replace(/\u0000/g, '');
}

const nameToEnode = (name)=>{
  for(let i=0; i<keys.AVAILABLE_NETWORKS.length; i++) {
    if(keys.AVAILABLE_NETWORKS[i].name == name) {
      return keys.AVAILABLE_NETWORKS[i].enode;
    }
  }
}

const nodeToName = (node)=>{
  for(let i=0; i<keys.AVAILABLE_NETWORKS.length; i++) {
    if(keys.AVAILABLE_NETWORKS[i].enode == node) {
      return keys.AVAILABLE_NETWORKS[i].name;
    }
  }
}

/**
 * TODO: make it with pinging ports
 */
function allocateFreePorts() {
  ++Q_config.ports.gethNode;
  ++Q_config.ports.gethNodeRPC;
  ++Q_config.ports.gethNodeWS_RPC;
  ++Q_config.ports.raftHttp;
  ++Q_config.ports.devp2p;
  ++Q_config.ports.constellation;
  ++Q_config.chainId;
}

module.exports = {
	fromHex,
	Storage,
  nameToEnode,
  nodeToName,
  asciiToHex,
  allocateFreePorts
}