1096 lines
25 KiB
JavaScript
1096 lines
25 KiB
JavaScript
/**
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* mempool.js - mempool for bcoin
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* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
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* https://github.com/indutny/bcoin
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*/
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var EventEmitter = require('events').EventEmitter;
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var bcoin = require('../bcoin');
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var bn = require('bn.js');
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var constants = bcoin.protocol.constants;
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var network = bcoin.protocol.network;
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var utils = require('./utils');
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var assert = utils.assert;
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var BufferWriter = require('./writer');
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var BufferReader = require('./reader');
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var VerifyError = utils.VerifyError;
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/**
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* Mempool
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*/
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function Mempool(node, options) {
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if (!(this instanceof Mempool))
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return new Mempool(node, options);
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EventEmitter.call(this);
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if (!options)
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options = {};
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this.options = options;
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this.node = node;
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this.chain = node.chain;
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this.loaded = false;
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this.locker = new bcoin.locker(this, this.addTX, 20 << 20);
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this.db = null;
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this.tx = null;
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this.size = 0;
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this.orphans = 0;
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this.freeCount = 0;
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this.lastTime = 0;
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this.limitFree = this.options.limitFree !== false;
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this.limitFreeRelay = this.options.limitFreeRelay || 15;
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this.relayPriority = this.options.relayPriority !== false;
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this.requireStandard = this.options.requireStandard !== false;
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this.rejectInsaneFees = this.options.rejectInsaneFees !== false;
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this.relay = this.options.relay || false;
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// Use an in-memory binary search tree by default
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this.backend = this.options.memory === false ? 'leveldb' : 'memory';
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Mempool.global = this;
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this._init();
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}
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utils.inherits(Mempool, EventEmitter);
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Mempool.flags = constants.flags.STANDARD_VERIFY_FLAGS;
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Mempool.mandatory = constants.flags.MANDATORY_VERIFY_FLAGS;
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Mempool.lockFlags = constants.flags.STANDARD_LOCKTIME_FLAGS;
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Mempool.ANCESTOR_LIMIT = 25;
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Mempool.MAX_MEMPOOL_SIZE = 300 << 20;
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Mempool.MEMPOOL_EXPIRY = 72 * 60 * 60;
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Mempool.MAX_ORPHAN_TX = 100;
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Mempool.prototype._lock = function _lock(func, args, force) {
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return this.locker.lock(func, args, force);
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};
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Mempool.prototype.purgePending = function purgePending() {
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return this.locker.purgePending();
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};
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Mempool.prototype._init = function _init() {
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var self = this;
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var unlock = this._lock(utils.nop, []);
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assert(unlock);
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// Clean the database before loading. The only
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// reason for using an on-disk db for the mempool
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// is not for persistence, but to keep ~300mb of
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// txs out of main memory.
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bcoin.ldb.destroy('mempool', this.backend, function(err) {
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if (err) {
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unlock();
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return self.emit('error', err);
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}
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self.db = bcoin.ldb('mempool', {
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db: self.backend
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});
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self.tx = new bcoin.txdb('m', self.db, {
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indexExtra: false,
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indexAddress: false,
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mapAddress: false,
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verify: false
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});
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self.db.open(function(err) {
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if (err) {
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unlock();
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return self.emit('error', err);
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}
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self.dynamicMemoryUsage(function(err, size) {
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if (err)
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self.emit('error', err);
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else
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self.size = size;
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self.chain.open(function(err) {
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if (err) {
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unlock();
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return self.emit('error', err);
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}
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unlock();
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self.loaded = true;
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self.emit('open');
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});
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});
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});
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});
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};
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Mempool.prototype.dynamicMemoryUsage = function dynamicMemoryUsage(callback) {
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return this.db.approximateSize('m', 'm~', callback);
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};
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Mempool.prototype.open = function open(callback) {
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if (this.loaded)
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return utils.nextTick(callback);
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return this.once('open', callback);
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};
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Mempool.prototype.close =
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Mempool.prototype.destroy = function destroy(callback) {
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this.db.close(utils.ensure(callback));
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};
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Mempool.prototype.addBlock = function addBlock(block, callback, force) {
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var self = this;
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var txs = [];
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var unlock = this._lock(addBlock, [block, callback], force);
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if (!unlock)
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return;
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callback = utils.wrap(callback, unlock);
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utils.forEachSerial(block.txs, function(tx, next) {
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var hash = tx.hash('hex');
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var copy;
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if (tx.isCoinbase())
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return next();
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self.getTX(hash, function(err, existing) {
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if (err)
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return callback(err);
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if (!existing)
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return self.removeOrphan(hash, next);
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copy = tx.clone();
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copy.ts = existing.ts;
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copy.block = existing.block;
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copy.height = existing.height;
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copy.ps = existing.ps;
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self.removeUnchecked(copy, function(err) {
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if (err)
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return next(err);
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self.emit('confirmed', tx, block);
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return next();
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});
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});
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}, callback);
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};
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Mempool.prototype.removeBlock = function removeBlock(block, callback, force) {
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var self = this;
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var unlock = this._lock(removeBlock, [block, callback], force);
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if (!unlock)
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return;
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callback = utils.wrap(callback, unlock);
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utils.forEachSerial(block.txs.slice().reverse(), function(tx, next) {
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var copy;
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if (tx.isCoinbase())
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return next();
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self.hasTX(tx.hash('hex'), function(err, result) {
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if (err)
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return next(err);
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if (result)
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return next();
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copy = tx.clone();
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copy.ts = 0;
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copy.block = null;
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copy.height = -1;
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copy.ps = utils.now();
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self.addUnchecked(copy, function(err) {
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if (err)
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return next(err);
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self.emit('unconfirmed', tx, block);
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return next();
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});
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});
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}, callback);
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};
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Mempool.prototype.limitMempoolSize = function limitMempoolSize(callback) {
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var self = this;
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if (this.size <= Mempool.MAX_MEMPOOL_SIZE)
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return callback(null, true);
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this.tx.getRange({
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start: 0,
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end: utils.now() - Mempool.MEMPOOL_EXPIRY
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}, function(err, txs) {
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if (err)
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return callback(err);
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utils.forEachSerial(function(tx, next) {
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self.removeUnchecked(tx, next);
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}, function(err) {
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if (err)
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return callback(err);
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self.purgeOrphans(function(err) {
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if (err)
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return callback(err);
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return callback(self.size <= Mempool.MAX_MEMPOOL_SIZE);
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});
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});
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});
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};
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Mempool.prototype.purgeOrphans = function purgeOrphans(callback) {
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var self = this;
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var batch = this.db.batch();
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callback = utils.ensure(callback);
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utils.forEachSerial(['m/D', 'm/d'], function(type, callback) {
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var iter = self.db.iterator({
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gte: type,
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lte: type + '~',
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keys: true,
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values: false,
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fillCache: false,
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keyAsBuffer: false
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});
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(function next() {
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iter.next(function(err, key, value) {
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if (err) {
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return iter.end(function() {
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callback(err);
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});
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}
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if (key === undefined)
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return iter.end(callback);
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batch.del(key);
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next();
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});
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})();
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}, function(err) {
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if (err)
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return callback(err);
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batch.write(function(err) {
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if (err)
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return callback(err);
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self.dynamicMemoryUsage(function(err, size) {
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if (err)
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return callback(err);
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self.size = size;
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self.orphans = 0;
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return callback();
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});
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});
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});
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};
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Mempool.prototype.getTX = function getTX(hash, callback) {
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if (hash instanceof bcoin.tx)
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hash = hash.hash('hex');
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return this.tx.getTX(hash, callback);
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};
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Mempool.prototype.getCoin = function getCoin(hash, index, callback) {
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return this.tx.getCoin(hash, index, callback);
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};
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Mempool.prototype.isSpent = function isSpent(hash, index, callback) {
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return this.tx.isSpent(hash, index, callback);
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};
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Mempool.prototype.getCoinsByAddress = function getCoinsByAddress(addresses, callback) {
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return this.tx.getCoinsByAddress(addresses, callback);
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};
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Mempool.prototype.getTXByAddress = function getTXByAddress(addresses, callback) {
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return this.tx.getTXByAddress(addresses, callback);
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};
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Mempool.prototype.fillTX = function fillTX(tx, callback) {
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return this.tx.fillTX(tx, callback);
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};
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Mempool.prototype.fillCoins = function fillCoins(tx, callback) {
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return this.tx.fillCoins(tx, callback);
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};
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Mempool.prototype.hasTX = function hasTX(hash, callback) {
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return this.tx.hasTX(hash, callback);
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};
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Mempool.prototype.addTX = function addTX(tx, callback, force) {
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var self = this;
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var flags = Mempool.flags;
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var lockFlags = Mempool.lockFlags;
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var ret = {};
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var now;
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var unlock = this._lock(addTX, [tx, callback], force);
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if (!unlock)
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return;
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if (this.chain.segwitActive) {
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flags |= constants.flags.VERIFY_WITNESS;
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flags |= constants.flags.VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM;
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}
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callback = utils.wrap(callback, unlock);
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callback = utils.asyncify(callback);
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if (tx.ts !== 0) {
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return callback(new VerifyError(tx,
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'alreadyknown',
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'txn-already-in-mempool',
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0));
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}
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if (!this.chain.segwitActive) {
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if (tx.hasWitness())
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return callback(new VerifyError(tx, 'nonstandard', 'no-witness-yet', 0));
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}
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if (!tx.isSane(ret))
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return callback(new VerifyError(tx, 'invalid', ret.reason, ret.score));
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if (tx.isCoinbase())
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return callback(new VerifyError(tx, 'invalid', 'coinbase', 100));
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this.chain.checkFinal(this.chain.tip, tx, lockFlags, function(err, isFinal) {
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if (err)
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return callback(err);
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if (!isFinal)
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return callback(new VerifyError(tx, 'nonstandard', 'non-final', 0));
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if (self.requireStandard) {
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if (!tx.isStandard(flags, ret))
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return callback(new VerifyError(tx, ret.reason, 0));
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}
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self.seenTX(tx, function(err, exists) {
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if (err)
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return callback(err);
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if (exists) {
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return callback(new VerifyError(tx,
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'alreadyknown',
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'txn-already-in-mempool',
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0));
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}
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self.isDoubleSpend(tx, function(err, doubleSpend) {
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if (err)
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return callback(err);
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if (doubleSpend) {
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return callback(new VerifyError(tx,
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'duplicate',
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'bad-txns-inputs-spent',
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0));
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}
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self.fillAllCoins(tx, function(err) {
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if (err)
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return callback(err);
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if (!tx.hasCoins()) {
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if (self.totalSize > Mempool.MAX_MEMPOOL_SIZE) {
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return callback(new VerifyError(tx,
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'insufficientfee',
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'mempool full',
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0));
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}
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utils.debug('Added orphan %s to mempool.', tx.rhash);
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return self.storeOrphan(tx, callback);
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}
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self.verify(tx, function(err) {
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if (err)
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return callback(err);
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self.limitMempoolSize(function(err, result) {
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if (err)
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return callback(err);
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if (!result) {
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return callback(new VerifyError(tx,
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'insufficientfee',
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'mempool full',
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0));
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}
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self.addUnchecked(tx, callback);
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});
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});
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});
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});
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});
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});
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};
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Mempool.prototype.addUnchecked = function addUnchecked(tx, callback) {
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var self = this;
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this.tx.addUnchecked(tx, function(err) {
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if (err)
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return callback(err);
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self.size += tx.getSize();
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self.emit('tx', tx);
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self.emit('add tx', tx);
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utils.debug('Added tx %s to the mempool.', tx.rhash);
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if (self.options.relay)
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self.node.broadcast(tx);
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self.resolveOrphans(tx, function(err, resolved) {
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if (err)
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return callback(err);
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utils.forEachSerial(resolved, function(tx, next) {
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self.verify(tx, function(err) {
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if (err) {
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if (err.type === 'VerifyError') {
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utils.debug('Could not resolved orphan %s: %s.',
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tx.rhash,
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err.message);
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return next();
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}
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self.emit('error', err);
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return next();
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}
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self.addUnchecked(tx, function(err) {
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if (err) {
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self.emit('error', err);
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return next();
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}
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utils.debug('Resolved orphan %s in mempool.', tx.rhash);
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next();
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});
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});
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}, callback);
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});
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});
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};
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Mempool.prototype.removeUnchecked = function removeUnchecked(tx, callback) {
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var self = this;
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this.fillAllTX(tx, function(err, tx) {
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if (err)
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return callback(err);
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self.removeOrphan(tx, function(err) {
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if (err)
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return callback(err);
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self.tx.removeUnchecked(tx, function(err) {
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if (err)
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return callback(err);
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self.size -= tx.getSize();
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self.emit('remove tx', tx);
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return callback();
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});
|
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});
|
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});
|
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};
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Mempool.prototype.verify = function verify(tx, callback) {
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var self = this;
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var height = this.chain.height + 1;
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var lockFlags = Mempool.lockFlags;
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var flags = Mempool.flags;
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var mandatory = Mempool.mandatory;
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var ret = {};
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var fee, now, free, minFee;
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|
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if (this.chain.segwitActive) {
|
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flags |= constants.flags.VERIFY_WITNESS;
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flags |= constants.flags.VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM;
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mandatory |= constants.flags.VERIFY_WITNESS;
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}
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this.checkLocks(tx, lockFlags, function(err, result) {
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if (err)
|
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return callback(err);
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|
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if (!result) {
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return callback(new VerifyError(tx,
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'nonstandard',
|
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'non-BIP68-final',
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0));
|
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}
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|
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if (self.requireStandard && !tx.hasStandardInputs(flags)) {
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return callback(new VerifyError(tx,
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'nonstandard',
|
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'bad-txns-nonstandard-inputs',
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0));
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}
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|
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if (tx.getSigops(true) > constants.tx.maxSigops) {
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return callback(new VerifyError(tx,
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'nonstandard',
|
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'bad-txns-too-many-sigops',
|
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0));
|
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}
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|
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if (!tx.checkInputs(height, ret))
|
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return callback(new VerifyError(tx, 'invalid', ret.reason, ret.score));
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|
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fee = tx.getFee();
|
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minFee = tx.getMinFee();
|
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if (fee.cmp(minFee) < 0) {
|
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if (self.relayPriority) {
|
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free = tx.isFree(height);
|
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if (!free) {
|
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return callback(new VerifyError(tx,
|
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'insufficientfee',
|
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'insufficient priority',
|
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0));
|
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}
|
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} else {
|
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return callback(new VerifyError(tx,
|
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'insufficientfee',
|
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'insufficient fee',
|
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0));
|
|
}
|
|
}
|
|
|
|
if (self.limitFree && free) {
|
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now = utils.now();
|
|
|
|
if (!self.lastTime)
|
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self.lastTime = now;
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|
|
self.freeCount *= Math.pow(1 - 1 / 600, now - self.lastTime);
|
|
self.lastTime = now;
|
|
|
|
if (self.freeCount > self.limitFreeRelay * 10 * 1000) {
|
|
return callback(new VerifyError(tx,
|
|
'insufficientfee',
|
|
'rate limited free transaction',
|
|
0));
|
|
}
|
|
|
|
self.freeCount += tx.getSize();
|
|
}
|
|
|
|
if (self.rejectInsaneFees && fee.cmp(minFee.muln(10000)) > 0)
|
|
return callback(new VerifyError(tx, 'highfee', 'absurdly-high-fee', 0));
|
|
|
|
self.countAncestors(tx, function(err, count) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (count > Mempool.ANCESTOR_LIMIT) {
|
|
return callback(new VerifyError(tx,
|
|
'nonstandard',
|
|
'too-long-mempool-chain',
|
|
0));
|
|
}
|
|
|
|
// Do this in the worker pool.
|
|
tx.verifyAsync(null, true, flags, function(err, result) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (!result) {
|
|
return tx.verifyAsync(null, true, mandatory, function(err, result) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (result) {
|
|
return callback(new VerifyError(tx,
|
|
'nonstandard',
|
|
'non-mandatory-script-verify-flag',
|
|
0));
|
|
}
|
|
|
|
return callback(new VerifyError(tx,
|
|
'nonstandard',
|
|
'mandatory-script-verify-flag',
|
|
0));
|
|
});
|
|
}
|
|
|
|
return callback();
|
|
});
|
|
});
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.countAncestors = function countAncestors(tx, callback) {
|
|
var self = this;
|
|
var max = 0;
|
|
|
|
utils.forEachSerial(tx.inputs, function(input, next, i) {
|
|
var count = 0;
|
|
self.getTX(input.prevout.hash, function(err, tx) {
|
|
if (err)
|
|
return next(err);
|
|
|
|
if (!tx)
|
|
return next();
|
|
|
|
count += 1;
|
|
|
|
self.countAncestors(tx, function(err, prev) {
|
|
if (err)
|
|
return next(err);
|
|
|
|
count += prev;
|
|
|
|
if (count > max)
|
|
max = count;
|
|
|
|
next();
|
|
});
|
|
});
|
|
}, function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
return callback(null, max);
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.storeOrphan = function storeOrphan(tx, callback, force) {
|
|
var self = this;
|
|
var prevout = {};
|
|
var batch = this.db.batch();
|
|
var hash = tx.hash('hex');
|
|
var i, input, p;
|
|
|
|
for (i = 0; i < tx.inputs.length; i++) {
|
|
input = tx.inputs[i];
|
|
if (!input.coin)
|
|
prevout[input.prevout.hash] = true;
|
|
}
|
|
|
|
prevout = Object.keys(prevout);
|
|
|
|
assert(prevout.length > 0);
|
|
|
|
utils.forEachSerial(prevout, function(prev, next) {
|
|
self.getWaiting(prev, function(err, orphans, buf) {
|
|
if (err)
|
|
return next(err);
|
|
|
|
p = new BufferWriter();
|
|
|
|
if (buf)
|
|
p.writeBytes(buf);
|
|
|
|
p.writeHash(hash);
|
|
|
|
batch.put('m/d/' + prev, p.render());
|
|
|
|
next();
|
|
});
|
|
}, function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
self.orphans++;
|
|
|
|
batch.put('m/D/' + hash, tx.toExtended(true));
|
|
|
|
if (self.orphans > Mempool.MAX_ORPHAN_TX) {
|
|
return self.purgeOrphans(function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
batch.write(callback);
|
|
});
|
|
}
|
|
|
|
batch.write(callback);
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.getBalance = function getBalance(callback) {
|
|
return this.tx.getBalance(callback);
|
|
};
|
|
|
|
Mempool.prototype.getAll = function getAll(callback) {
|
|
return this.tx.getAll(callback);
|
|
};
|
|
|
|
Mempool.prototype.getWaiting = function getWaiting(hash, callback) {
|
|
var self = this;
|
|
var hashes = [];
|
|
var p;
|
|
|
|
this.db.get('m/d/' + hash, function(err, buf) {
|
|
if (err && err.type !== 'NotFoundError')
|
|
return callback(err);
|
|
|
|
if (!buf)
|
|
return callback(null, hashes, buf);
|
|
|
|
p = new BufferReader(buf);
|
|
|
|
p.start();
|
|
|
|
try {
|
|
while (p.left())
|
|
hashes.push(p.readHash('hex'));
|
|
} catch (e) {
|
|
return callback(e);
|
|
}
|
|
|
|
p.end();
|
|
|
|
return callback(null, hashes, buf);
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.getOrphan = function getOrphan(orphanHash, callback) {
|
|
var self = this;
|
|
|
|
this.db.get('m/D/' + orphanHash, function(err, orphan) {
|
|
if (err && err.type !== 'NotFoundError')
|
|
return next(err);
|
|
|
|
if (!orphan)
|
|
return callback();
|
|
|
|
try {
|
|
orphan = bcoin.tx.fromExtended(orphan, true);
|
|
} catch (e) {
|
|
return callback(e);
|
|
}
|
|
|
|
return callback(null, orphan);
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.hasOrphan = function hasOrphan(orphanHash, callback) {
|
|
return this.getOrphan(orphanHash, function(err, tx) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
return callback(null, tx != null);
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.resolveOrphans = function resolveOrphans(tx, callback, force) {
|
|
var self = this;
|
|
var hash = tx.hash('hex');
|
|
var resolved = [];
|
|
var batch = this.db.batch();
|
|
|
|
this.getWaiting(hash, function(err, hashes) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
utils.forEachSerial(hashes, function(orphanHash, next, i) {
|
|
self.getOrphan(orphanHash, function(err, orphan) {
|
|
if (err)
|
|
return next(err);
|
|
|
|
if (!orphan)
|
|
return next();
|
|
|
|
orphan.fillCoins(tx);
|
|
|
|
if (orphan.hasCoins()) {
|
|
self.orphans--;
|
|
batch.del('m/D/' + orphanHash);
|
|
resolved.push(orphan);
|
|
return next();
|
|
}
|
|
|
|
batch.put('m/D/' + orphanHash, orphan.toExtended(true));
|
|
next();
|
|
});
|
|
}, function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
function done(err) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
return callback(null, resolved);
|
|
}
|
|
|
|
batch.del('m/d/' + hash);
|
|
|
|
return batch.write(done);
|
|
});
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.removeOrphan = function removeOrphan(tx, callback) {
|
|
var self = this;
|
|
var batch, prevout, hash;
|
|
|
|
function getOrphan(tx, callback) {
|
|
if (typeof tx === 'string')
|
|
return self.getOrphan(tx, callback);
|
|
return callback(null, tx);
|
|
}
|
|
|
|
return getOrphan(tx, function(err, tx) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (!tx)
|
|
return callback();
|
|
|
|
batch = self.db.batch();
|
|
|
|
hash = tx.hash('hex');
|
|
prevout = tx.getPrevout();
|
|
|
|
batch.del('m/D/' + hash);
|
|
|
|
utils.forEach(prevout, function(prev, next) {
|
|
var i, p;
|
|
self.getWaiting(prev, function(err, hashes) {
|
|
if (err)
|
|
return next(err);
|
|
|
|
if (hashes.length === 0)
|
|
return next();
|
|
|
|
i = hashes.indexOf(hash);
|
|
if (i !== -1)
|
|
hashes.splice(i, 1);
|
|
|
|
if (hashes.length === 0) {
|
|
batch.del('m/d/' + prev);
|
|
return next();
|
|
}
|
|
|
|
p = new BufferWriter();
|
|
hashes.forEach(function(hash) {
|
|
p.writeHash(hash);
|
|
});
|
|
|
|
batch.put('m/d/' + prev, p.render());
|
|
|
|
next();
|
|
});
|
|
}, function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
batch.write(callback);
|
|
});
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.seenTX = function seenTX(tx, callback) {
|
|
var self = this;
|
|
var hash = tx.hash('hex');
|
|
|
|
return this.hasOrphan(hash, function(err, result) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (result)
|
|
return callback(null, true);
|
|
|
|
return self.hasTX(hash, function(err, result) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (result)
|
|
return callback(null, true);
|
|
|
|
return self.chain.db.hasTX(hash, callback);
|
|
});
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.fillAllTX = function fillAllTX(tx, callback) {
|
|
var self = this;
|
|
|
|
this.fillTX(tx, function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (tx.hasCoins())
|
|
return callback(null, tx);
|
|
|
|
self.chain.db.fillTX(tx, callback);
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.fillAllCoins = function fillAllCoins(tx, callback) {
|
|
var self = this;
|
|
var doubleSpend = false;
|
|
|
|
this.fillCoins(tx, function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (tx.hasCoins())
|
|
return callback(null, tx);
|
|
|
|
utils.forEach(tx.inputs, function(input, next) {
|
|
var hash = input.prevout.hash;
|
|
var index = input.prevout.index;
|
|
|
|
self.isSpent(hash, index, function(err, spent) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (spent) {
|
|
doubleSpend = true;
|
|
return next();
|
|
}
|
|
|
|
self.chain.db.getCoin(hash, index, function(err, coin) {
|
|
if (err)
|
|
return next(err);
|
|
|
|
if (!coin)
|
|
return next();
|
|
|
|
input.coin = coin;
|
|
|
|
next();
|
|
});
|
|
});
|
|
}, function(err) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
return callback(null, tx, doubleSpend);
|
|
});
|
|
});
|
|
};
|
|
|
|
Mempool.prototype.getSnapshot = function getSnapshot(callback) {
|
|
return this.tx.getAllHashes(callback);
|
|
};
|
|
|
|
Mempool.prototype.checkLocks = function checkLocks(tx, flags, callback) {
|
|
var self = this;
|
|
var tip = this.chain.tip;
|
|
|
|
var index = new bcoin.chainblock(this.chain, {
|
|
hash: utils.toHex(constants.zeroHash),
|
|
version: tip.version,
|
|
prevBlock: tip.hash,
|
|
merkleRoot: utils.toHex(constants.zeroHash),
|
|
ts: utils.now(),
|
|
bits: 0,
|
|
nonce: 0,
|
|
height: tip.height + 1,
|
|
chainwork: tip.chainwork
|
|
});
|
|
|
|
return this.chain.checkLocks(tx, flags, index, callback);
|
|
};
|
|
|
|
Mempool.prototype.isDoubleSpend = function isDoubleSpend(tx, callback) {
|
|
return this.tx.isDoubleSpend(tx, callback);
|
|
};
|
|
|
|
// Use bitcoinj-style confidence calculation
|
|
Mempool.prototype.getConfidence = function getConfidence(hash, callback) {
|
|
var self = this;
|
|
var tx;
|
|
|
|
callback = utils.asyncify(callback);
|
|
|
|
function isDoubleSpend(callback) {
|
|
if (tx)
|
|
return self.isDoubleSpend(tx, callback);
|
|
return callback(null, false);
|
|
}
|
|
|
|
function done(tx, hash) {
|
|
return isDoubleSpend(function(err, result) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (result)
|
|
return callback(null, constants.confidence.INCONFLICT);
|
|
|
|
return self.hasTX(hash, function(err, result) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (result)
|
|
return callback(null, constants.confidence.PENDING);
|
|
|
|
function getBlock(callback) {
|
|
if (tx && tx.block)
|
|
return callback(null, tx.block);
|
|
return self.chain.db.getTX(hash, function(err, existing) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (!existing)
|
|
return callback();
|
|
|
|
return callback(null, existing.block);
|
|
});
|
|
}
|
|
|
|
return getBlock(function(err, block) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (!block)
|
|
return callback(null, constants.confidence.UNKNOWN);
|
|
|
|
self.chain.db.isMainChain(block, function(err, result) {
|
|
if (err)
|
|
return callback(err);
|
|
|
|
if (result)
|
|
return callback(null, constants.confidence.BUILDING);
|
|
|
|
return callback(null, constants.confidence.DEAD);
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
if (hash instanceof bcoin.tx)
|
|
return done(hash, hash.hash('hex'));
|
|
|
|
return this.getTX(hash, function(err, tx) {
|
|
if (err)
|
|
return callback(err);
|
|
done(tx, hash);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Expose
|
|
*/
|
|
|
|
module.exports = Mempool;
|