144 lines
3.8 KiB
JavaScript
144 lines
3.8 KiB
JavaScript
'use strict';
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var Promise = require('bluebird');
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var bitcore = require('bitcore');
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var TransactionService = require('./transaction');
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var RPC = require('bitcoind-rpc');
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var _ = bitcore.deps._;
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var NULLTXHASH = bitcore.util.buffer.emptyBuffer(32).toString('hex');
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var LASTTXHASH = bitcore.util.buffer.fill(bitcore.util.buffer.emptyBuffer(32), -1).toString('hex');
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var MAXOUTPUT = 4294967295;
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function AddressService(opts) {
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opts = _.extend({}, opts);
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this.transactionService = opts.transactionService;
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this.blockService = opts.blockService;
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this.database = opts.database || Promise.promisifyAll(new LevelUp(config.get('LevelUp')));
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this.rpc = opts.rpc || Promise.promisifyAll(new RPC(config.get('RPC')));
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}
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AddressService.prototype.getSummary = function(address, confirmations) {
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var self = this;
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var tip, allOutputs, spent;
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return Promise.try(function() {
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return self.blockService.getLatest();
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}).then(function(latest) {
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tip = latest;
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return self.getAllOutputs(address);
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}).then(function(outputs) {
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allOutputs = outputs;
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return self.getSpent(address);
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}).then(function(spent) {
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return self.buildAddressSummary(address, tip, allOutputs, spent, confirmations);
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});
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};
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AddressService.processOutput = function(data) {
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var elements = data.key.split('-');
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var output = _.extend(JSON.parse(data.value), {
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address: elements[1],
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txId: elements[2],
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outputIndex: elements[3]
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});
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return output;
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};
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var retrieveOutputs = function(indexFunction, processElement) {
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return function(address) {
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var results = [];
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var self = this;
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return new Promise(function(resolve, reject) {
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self.database.createReadStream({
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gte: indexFunction(address, NULLTXHASH, 0),
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lte: indexFunction(address, LASTTXHASH, MAXOUTPUT)
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}).on('data', function(element) {
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results.push(processElement(element));
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}).on('error', reject).on('end', function() {
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return resolve(results);
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});
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});
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};
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};
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AddressService.prototype.getAllOutputs = retrieveOutputs(
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TransactionService.Index.getOutputsForAddress,
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function(e) {
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return AddressService.processOutput(e);
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}
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);
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AddressService.prototype.getSpent = retrieveOutputs(
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TransactionService.Index.getSpentOutputsForAddress,
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function(element) {
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return JSON.parse(element.value);
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}
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);
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AddressService.prototype.buildAddressSummary = function(address, tip, allOutputs, spent, confirmations) {
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var result = {};
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var transactionsAppended = {};
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confirmations = confirmations || 6;
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result.address = address.toString();
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result.transactions = [];
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result.confirmed = {
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balance: 0,
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sent: 0,
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received: 0
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};
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result.unconfirmed = {
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balance: 0,
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sent: 0,
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received: 0
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};
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var outputValues = {};
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_.each(allOutputs, function(output) {
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var value = output.satoshis;
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outputValues[output.txId + '-' + output.outputIndex] = value;
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result.unconfirmed.balance += value;
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result.unconfirmed.received += value;
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if (tip.height - output.heightConfirmed + 1 >= confirmations) {
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result.confirmed.balance += value;
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result.confirmed.received += value;
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}
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if (!transactionsAppended[output.txId]) {
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transactionsAppended[output.txId] = true;
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result.transactions.push(output.txId);
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}
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});
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_.each(spent, function(output) {
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var value = outputValues[output.spendInput.prevTxId + '-' + output.spendInput.outputIndex];
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if (!transactionsAppended[output.spentTx]) {
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transactionsAppended[output.spentTx] = true;
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result.transactions.push(output.spentTx);
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}
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result.unconfirmed.balance -= value;
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result.unconfirmed.sent += value;
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if (tip.height - output.heightSpent + 1 >= confirmations) {
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result.confirmed.balance -= value;
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result.confirmed.sent += value;
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}
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});
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return result;
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};
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module.exports = AddressService;
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