Partial Block Explorer

index.js

var Web3 = require('web3');
var	web3 = new Web3('https://mainnet.infura.io/v3/bf5c3d819a0d4492a387eb40cdf82d6b');

var finalBlock = web3.eth.getBlockNumber().then(captureBlockRange);

//This will contain an ordered list of all transactions
var transactionList = new Array();
var ethTransferred = 0;
var addressRecords = [];//{address:"0x0",sent:0,received:0,contract:false}

function captureBlockRange(finalBlock){
	console.log("Final Block #", finalBlock);
	var startingBlock = finalBlock - 2;
	var promiseForBlocks = [];

	for(var i = startingBlock; i <= finalBlock; i += 1 ){
		let blockPromise = web3.eth.getBlock(i, true);
		promiseForBlocks.push( blockPromise );
	}
	
	Promise.all(promiseForBlocks).then( handlePromiseForBlocks );
}

function handlePromiseForBlocks(resultsArray){
	resultsArray.forEach( (block) => {
		//this will add the transactions to the transaction list
		if(block.transactions)
			transactionList = transactionList.concat(block.transactions);
	});

	transactionList.forEach( recordTransaction );

	var promisesForContractDetection = [];
	var ii = 0;
	
	addressRecords.forEach( (address,i)=>{
		if(address.address){
			let contractDetection = web3.eth.getCode(address.address).then( (result)=>{
				address.isContract = (result.length>2);
				var isContract = 'No';
				if(address.isContract){
					isContract = 'Yes';
				}
				console.log(address.address+"\t Contract["+isContract+"]\nSent: "+address.sent+" Received:"+address.received);
			}).catch( ()=>{console.log("Couldn't get this one")} );

			promisesForContractDetection.push(contractDetection); 
		}
	});
	Promise.all(promisesForContractDetection).then( ()=>{
		console.log("All requests complete");
		//a report document would be created here.
	});

}

function recordTransaction(transaction){
	var addressRecord_ofSender = getAddressRecord(transaction.from);
	var addressRecord_ofReceiver = getAddressRecord(transaction.to);
	
	var transactionValue = parseInt(transaction.value);
	addressRecord_ofSender.sent += transactionValue;
	addressRecord_ofReceiver.received += transactionValue;
	ethTransferred += transactionValue;
}

function getAddressRecord(address){
	var addressRecord = addressRecords.find( (addressRecord)=>{ return addressRecord.address === address } );

	if (addressRecord === undefined){
		addressRecords.push({
			address: address,
			sent:0,
			received:0,
			isContract: false
		});
		//console.log("new address record: \t" + address);
		return addressRecords[addressRecords.length-1];
	}else{
		//console.log("existing address:\t " + address);
		return addressRecord;
	}
}