js

'use strict';
// import blockchain parameters for Dash
var params = require('webcoin-dash').blockchain
var levelup = require('levelup');
// create a LevelUp database where the block data should be stored
var db = levelup('dash.chain', { db: require('memdown') })

var DBH = require('dash-blockchain-helpers');

var dbh = new DBH({
    insightAPI_URI:"http://192.168.0.19:3001/insight-api-dash"
});

// create blockchain
var Blockchain = require('./index.js');//replace with blockchain-spv-dash
var chain = new Blockchain(params, db)

// wait for the blockchain to be ready
chain.on('ready', async function () {
    console.log('chain is ready');

	//1) GET LAST HASH
	let tip = chain.getTip();
	console.log('\n');
	console.log('---tip from webcoin-dash).blockchain');
	console.log(tip);
	console.log('----reversed and tohexed string');
	console.log((reverse(tip.hash).toString('hex')));

    function reverse (src) {
        var buffer = new Buffer(src.length)

        for (var i = 0, j = src.length - 1; i <= j; ++i, --j) {
            buffer[i] = src[j]
            buffer[j] = src[i]
        }

        return buffer
    }

	let headers = (await dbh.retrieveBlockHeaders(0,1)).headers;
	//hash must be buffer
	console.log('\n');
	console.log('----data from block0')
	headers = headers.filter(function(_h){
        // console.log(reverse(new Buffer("e0028eb9648db56b1ac77cf090b99048a8007e2bb64b68f092c03c7f56a662c7",'hex')));
		_h.hash = new Buffer(_h.hash, "hex");
        if(_h.hasOwnProperty('prevHash'))
	        _h.prevHash = new Buffer(_h.prevHash, 'hex');
        if(_h.hasOwnProperty('nextHash'))
            _h.nextHash = new Buffer(_h.nextHash, 'hex');
        _h.chainWork = new Buffer(_h.chainWork, 'hex');
        _h.merkleRoot = new Buffer(_h.merkleRoot, 'hex');
        return _h;
	})
	console.log(headers);

	/*chain.addHeaders(headers, function(err, header){
		console.log(err, header);
        console.log(chain.getTip());

    });*/
	//chain.getBlockAtHeight(0, function(err, block){
	//	console.log('block', block);
	//})
  // use the blockchain
})
process.on('unhandledRejection',(e)=>{console.log(e);});