385 lines
8.8 KiB
JavaScript
385 lines
8.8 KiB
JavaScript
'use strict';
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var util = require('util');
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var chainlib = require('chainlib');
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var BaseDB = chainlib.DB;
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var Transaction = require('./transaction');
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var async = require('async');
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var bitcore = require('bitcore');
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var BufferWriter = bitcore.encoding.BufferWriter;
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var errors = require('./errors');
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var levelup = chainlib.deps.levelup;
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var log = chainlib.log;
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var PublicKey = bitcore.PublicKey;
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var Address = bitcore.Address;
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function DB(options) {
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if(!options) {
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options = {};
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}
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BaseDB.call(this, options);
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this.coinbaseAddress = options.coinbaseAddress;
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this.coinbaseAmount = options.coinbaseAmount || 50 * 1e8;
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this.Transaction = Transaction;
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this.network = bitcore.Networks.get(options.network) || bitcore.Networks.testnet;
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}
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util.inherits(DB, BaseDB);
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DB.PREFIXES = {
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OUTPUTS: 'outs'
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};
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DB.CONCURRENCY = 10;
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DB.prototype.getBlock = function(hash, callback) {
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var self = this;
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// get block from bitcoind
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this.bitcoind.getBlock(hash, function(err, blockData) {
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if(err) {
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return callback(err);
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}
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callback(null, self.Block.fromBuffer(blockData));
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});
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};
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DB.prototype.putBlock = function(block, callback) {
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// block is already stored in bitcoind, but we need to update
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// our prevhash index still
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this._updatePrevHashIndex(block, callback);
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};
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DB.prototype.getTransaction = function(txid, queryMempool, callback) {
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this.bitcoind.getTransaction(txid, queryMempool, function(err, txBuffer) {
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if(err) {
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return callback(err);
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}
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callback(null, Transaction().fromBuffer(txBuffer));
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});
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};
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DB.prototype.validateBlockData = function(block, callback) {
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// bitcoind does the validation
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setImmediate(callback);
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};
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DB.prototype._updateWeight = function(hash, weight, callback) {
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// bitcoind has all work for each block
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setImmediate(callback);
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};
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DB.prototype.buildGenesisData = function() {
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var coinbaseTx = this.buildCoinbaseTransaction();
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var bw = new BufferWriter();
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bw.writeVarintNum(1);
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bw.write(coinbaseTx.toBuffer());
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var merkleRoot = this.getMerkleRoot([coinbaseTx]);
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var buffer = bw.concat();
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return {
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merkleRoot: merkleRoot,
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buffer: buffer
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};
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};
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DB.prototype.buildCoinbaseTransaction = function(transactions, data) {
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if(!this.coinbaseAddress) {
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throw new Error('coinbaseAddress required to build coinbase');
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}
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if(!data) {
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data = bitcore.crypto.Random.getRandomBuffer(40);
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}
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var fees = 0;
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if(transactions && transactions.length) {
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fees = this.getInputTotal(transactions) - this.getOutputTotal(transactions, true);
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}
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var coinbaseTx = new this.Transaction();
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coinbaseTx.to(this.coinbaseAddress, this.coinbaseAmount + fees);
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var script = bitcore.Script.buildDataOut(data);
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var input = new bitcore.Transaction.Input({
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prevTxId: '0000000000000000000000000000000000000000000000000000000000000000',
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outputIndex: 0xffffffff,
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sequenceNumber: 4294967295,
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script: script
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});
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coinbaseTx.inputs = [input];
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return coinbaseTx;
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};
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DB.prototype.getOutputTotal = function(transactions, excludeCoinbase) {
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var totals = transactions.map(function(tx) {
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if(tx.isCoinbase() && excludeCoinbase) {
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return 0;
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} else {
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return tx._getOutputAmount();
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}
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});
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var grandTotal = totals.reduce(function(previousValue, currentValue) {
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return previousValue + currentValue;
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});
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return grandTotal;
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};
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DB.prototype.getInputTotal = function(transactions) {
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var totals = transactions.map(function(tx) {
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if(tx.isCoinbase()) {
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return 0;
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} else {
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return tx._getInputAmount();
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}
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});
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var grandTotal = totals.reduce(function(previousValue, currentValue) {
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return previousValue + currentValue;
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});
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return grandTotal;
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};
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DB.prototype._updateOutputs = function(block, addOutput, callback) {
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var txs = this.getTransactionsFromBlock(block);
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log.debug('Processing transactions', txs);
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log.debug('Updating outputs');
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var action = 'put';
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if (!addOutput) {
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action = 'del';
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}
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var operations = [];
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for (var i = 0; i < txs.length; i++) {
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var tx = txs[i];
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var txid = tx.id;
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var inputs = tx.inputs;
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var outputs = tx.outputs;
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for (var j = 0; j < outputs.length; j++) {
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var output = outputs[j];
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var script = output.script;
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if(!script) {
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log.debug('Invalid script');
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continue;
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}
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if (!script.isPublicKeyHashOut() && !script.isScriptHashOut() && !script.isPublicKeyOut()) {
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// ignore for now
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log.debug('script was not pubkeyhashout, scripthashout, or pubkeyout');
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continue;
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}
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var address;
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if(script.isPublicKeyOut()) {
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var pubkey = script.chunks[0].buf;
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address = Address.fromPublicKey(new PublicKey(pubkey), this.network);
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} else {
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address = output.script.toAddress(this.network);
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}
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var outputIndex = j;
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var timestamp = block.timestamp.getTime();
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var height = block.height;
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operations.push({
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type: action,
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key: [DB.PREFIXES.OUTPUTS, address, timestamp, txid, outputIndex].join('-'),
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value: [output.satoshis, script, height].join(':')
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});
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}
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if(tx.isCoinbase()) {
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continue;
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}
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}
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setImmediate(function() {
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callback(null, operations);
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});
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};
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DB.prototype._onChainAddBlock = function(block, callback) {
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var self = this;
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log.debug('DB handling new chain block');
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// Remove block from mempool
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self.mempool.removeBlock(block.hash);
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async.series([
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this._updateOutputs.bind(this, block, true), // add outputs
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], function(err, results) {
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if (err) {
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return callback(err);
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}
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var operations = [];
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for (var i = 0; i < results.length; i++) {
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operations = operations.concat(results[i]);
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}
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log.debug('Updating the database with operations', operations);
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self.store.batch(operations, callback);
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});
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};
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DB.prototype._onChainRemoveBlock = function(block, callback) {
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var self = this;
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async.series([
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this._updateOutputs.bind(this, block, false), // remove outputs
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], function(err, results) {
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if (err) {
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return callback(err);
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}
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var operations = [];
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for (var i = 0; i < results.length; i++) {
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operations = operations.concat(results[i]);
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}
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self.store.batch(operations, callback);
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});
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};
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DB.prototype.getAPIMethods = function() {
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return [
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['getTransaction', this, this.getTransaction, 2],
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['getBalance', this, this.getBalance, 2],
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['getOutputs', this, this.getOutputs, 2],
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['getUnspentOutputs', this, this.getUnspentOutputs, 2],
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['isSpent', this, this.isSpent, 2]
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];
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};
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DB.prototype.getBalance = function(address, queryMempool, callback) {
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this.getUnspentOutputs(address, queryMempool, function(err, outputs) {
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if(err) {
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return callback(err);
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}
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var satoshis = outputs.map(function(output) {
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return output.satoshis;
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});
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var sum = satoshis.reduce(function(a, b) {
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return a + b;
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}, 0);
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return callback(null, sum);
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});
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};
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DB.prototype.getOutputs = function(address, queryMempool, callback) {
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var self = this;
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var outputs = [];
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var key = [DB.PREFIXES.OUTPUTS, address].join('-');
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var stream = this.store.createReadStream({
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start: key,
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end: key + '~'
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});
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stream.on('data', function(data) {
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var key = data.key.split('-');
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var value = data.value.split(':');
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var output = {
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address: key[1],
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txid: key[3],
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outputIndex: Number(key[4]),
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satoshis: Number(value[0]),
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script: value[1],
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blockHeight: Number(value[2])
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};
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outputs.push(output);
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});
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var error;
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stream.on('error', function(streamError) {
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if (streamError) {
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error = streamError;
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}
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});
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stream.on('close', function() {
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if (error) {
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return callback(error);
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}
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if(queryMempool) {
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outputs = outputs.concat(self.bitcoind.getMempoolOutputs(address));
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}
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callback(null, outputs);
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});
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return stream;
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};
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DB.prototype.getUnspentOutputs = function(address, queryMempool, callback) {
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var self = this;
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this.getOutputs(address, queryMempool, function(err, outputs) {
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if (err) {
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return callback(err);
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} else if(!outputs.length) {
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return callback(new errors.NoOutputs('Address ' + address + ' has no outputs'), []);
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}
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var isUnspent = function(output, callback) {
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self.isUnspent(output, queryMempool, callback);
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};
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async.filter(outputs, isUnspent, function(results) {
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callback(null, results);
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});
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});
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};
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DB.prototype.isUnspent = function(output, queryMempool, callback) {
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this.isSpent(output, queryMempool, function(spent) {
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callback(!spent);
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});
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};
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DB.prototype.isSpent = function(output, queryMempool, callback) {
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var self = this;
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var txid = output.prevTxId ? output.prevTxId.toString('hex') : output.txid;
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setImmediate(function() {
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callback(self.bitcoind.isSpent(txid, output.outputIndex));
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});
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};
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module.exports = DB;
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