2015-07-21 13:59:08 -07:00
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'use strict';
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var BaseModule = require('../module');
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var inherits = require('util').inherits;
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var async = require('async');
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var chainlib = require('chainlib');
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var log = chainlib.log;
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2015-07-23 08:33:42 -07:00
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var errors = chainlib.errors;
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2015-07-21 13:59:08 -07:00
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var bitcore = require('bitcore');
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var PublicKey = bitcore.PublicKey;
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var Address = bitcore.Address;
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var AddressModule = function(options) {
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BaseModule.call(this, options);
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2015-07-29 10:34:53 -07:00
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this.txSubscriptions = {};
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this.balanceSubscriptions = {};
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2015-07-21 13:59:08 -07:00
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};
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inherits(AddressModule, BaseModule);
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AddressModule.PREFIXES = {
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OUTPUTS: 'outs'
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};
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AddressModule.prototype.getAPIMethods = function() {
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return [
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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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2015-07-29 10:34:53 -07:00
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AddressModule.prototype.getEvents = function() {
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return [
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['transaction', this, this.subscribeTransaction, this.unsubscribeTransaction],
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['balance', this, this.subscribeBalance, this.unsubscribeBalance]
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];
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};
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2015-07-21 13:59:08 -07:00
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AddressModule.prototype.blockHandler = function(block, addOutput, callback) {
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var txs = this.db.getTransactionsFromBlock(block);
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log.debug('Updating output index');
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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.db.network);
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} else {
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address = output.script.toAddress(this.db.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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2015-07-21 13:59:08 -07:00
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operations.push({
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type: action,
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key: [AddressModule.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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if(self.txSubscriptions[address]) {
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var subscriptions = self.txSubscriptions[address];
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for(var i = 0; i < subscriptions.length; i++) {
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subscriptions[i].emit('transaction', tx);
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}
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}
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if(self.balanceSubscriptions[address]) {
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var emitters = self.balanceSubsriptions[address];
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self.getBalance(address, true, function(err, balance) {
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if(err) {
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return self.emit(err);
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}
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for(var i = 0; i < subscriptions.length; i++) {
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emitters[i].emit('balance', address, balance, block);
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}
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});
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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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2015-07-29 10:34:53 -07:00
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AddressModule.prototype.subscribeTransaction = function(emitter, addresses) {
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for(var i = 0; i < addresses.length; i++) {
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if(!this.txSubscriptions[addresses[i]]) {
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this.txSubscriptions[addresses[i]] = [];
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}
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this.txSubscriptions[addresses[i]].push(emitter);
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}
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};
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AddressModule.prototype.subscribeBalance = function(emitter, addresses) {
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for(var i = 0; i < addresses.length; i++) {
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if(!this.balanceSubscriptions[addresses[i]]) {
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this.balanceSubscriptions[addresses[i]] = [];
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}
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this.balanceSubscriptions[addresses[i]].push(emitter);
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}
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};
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AddressModule.prototype.unsubscribeTransaction = function(emitter, addresses) {
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for(var i = 0; i < addresses.length; i++) {
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if(this.txSubscriptions[addresses[i]]) {
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var emitters = self.txSubscriptions[addresses[i]];
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var index = emitters.indexOf(emitter);
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if(index > -1) {
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emitters.splice(index, 1);
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}
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}
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}
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};
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AddressModule.prototype.unsubscribeBalance = function(emitter, addresses) {
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for(var i = 0; i < addresses.length; i++) {
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if(this.balanceSubscriptions[addresses[i]]) {
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var emitters = self.balanceSubscriptions[addresses[i]];
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var index = emitters.indexOf(emitter);
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if(index > -1) {
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emitters.splice(index, 1);
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}
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}
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}
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};
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AddressModule.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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AddressModule.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 = [AddressModule.PREFIXES.OUTPUTS, address].join('-');
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var stream = this.db.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.db.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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AddressModule.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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AddressModule.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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AddressModule.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.db.bitcoind.isSpent(txid, output.outputIndex));
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});
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};
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module.exports = AddressModule;
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