264 lines
6.1 KiB
JavaScript
264 lines
6.1 KiB
JavaScript
'use strict';
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var imports = require('soop').imports();
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var config = imports.config || require('../config/config');
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var bitcore = require('bitcore');
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var networks = bitcore.networks;
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var async = require('async');
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var syncId = 0;
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function Sync(opts) {
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this.id = syncId++;
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this.opts = opts || {};
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this.bDb = require('./BlockDb').default();
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this.txDb = require('./TransactionDb').default();
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this.network = config.network === 'testnet' ? networks.testnet : networks.livenet;
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}
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Sync.prototype.close = function(cb) {
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var self = this;
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self.txDb.close(function() {
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self.bDb.close(cb);
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});
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};
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Sync.prototype.destroy = function(next) {
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var self = this;
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async.series([
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function(b) {
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self.bDb.drop(b);
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},
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function(b) {
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self.txDb.drop(b);
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},
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], next);
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};
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/*
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* Arrives a NEW block, which is the new TIP
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*
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* Case 0) Simple case
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* A-B-C-D-E(TIP)-NEW
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*
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* Case 1)
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* A-B-C-D-E(TIP)
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* \
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* NEW
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*
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* 1) Declare D-E orphans (and possible invalidate TXs on them)
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*
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* Case 2)
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* A-B-C-D-E(TIP)
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* \
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* F-G-NEW
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* 1) Set F-G as connected (mark TXs as valid)
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* 2) Declare D-E orphans (and possible invalidate TXs on them)
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*
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*
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* Case 3)
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*
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* A-B-C-D-E(TIP) ... NEW
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*
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* NEW is ignored (if allowReorgs is false)
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*
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*
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*/
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Sync.prototype.storeTipBlock = function(b, allowReorgs, cb) {
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if (typeof allowReorgs === 'function') {
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cb = allowReorgs;
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allowReorgs = true;
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}
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if (!b) return cb();
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var self = this;
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var oldTip, oldNext, needReorg = false;
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var newPrev = b.previousblockhash;
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async.series([
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function(c) {
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self.bDb.has(b.hash, function(err, val) {
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return c(err ||
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(val ? new Error('WARN: Ignoring already existing block:' + b.hash) : null));
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});
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},
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function(c) {
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if (!allowReorgs) return c();
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self.bDb.has(newPrev, function(err, val) {
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if (!val && newPrev.match(/^0+$/)) return c();
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return c(err ||
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(!val ? new Error('NEED_SYNC Ignoring block with non existing prev:' + b.hash) : null));
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});
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},
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function(c) {
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self.txDb.createFromBlock(b, function(err) {
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return c(err);
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});
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},
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function(c) {
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if (!allowReorgs) return c();
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self.bDb.getTip(function(err, val) {
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oldTip = val;
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if (oldTip && newPrev !== oldTip) needReorg = true;
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return c();
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});
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},
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function(c) {
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if (!needReorg) return c();
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self.bDb.getNext(newPrev, function(err, val) {
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if (err) return c(err);
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oldNext = val;
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return c();
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});
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},
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function(c) {
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self.bDb.add(b, c);
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},
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function(c) {
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if (!needReorg) return c();
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console.log('NEW TIP: %s NEED REORG (old tip: %s)', b.hash, oldTip);
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self.processReorg(oldTip, oldNext, newPrev, c);
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},
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function(c) {
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if (!allowReorgs) return c();
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self.bDb.setTip(b.hash, function(err) {
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return c(err);
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});
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},
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function(c) {
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self.bDb.setNext(newPrev, b.hash, function(err) {
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return c(err);
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});
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}
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],
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function(err) {
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if (err && err.toString().match(/WARN/)) {
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err = null;
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}
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return cb(err);
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});
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};
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Sync.prototype.processReorg = function(oldTip, oldNext, newPrev, cb) {
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var self = this;
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var orphanizeFrom;
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async.series([
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function(c) {
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self.bDb.isMain(newPrev, function(err, val) {
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if (!val) return c();
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console.log('# Reorg Case 1)');
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// case 1
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orphanizeFrom = oldNext;
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return c(err);
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});
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},
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function(c) {
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if (orphanizeFrom) return c();
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console.log('# Reorg Case 2)');
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self.setBranchConnectedBackwards(newPrev, function(err, yHash, newYHashNext) {
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if (err) return c(err);
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self.bDb.getNext(yHash, function(err, yHashNext) {
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orphanizeFrom = yHashNext;
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self.bDb.setNext(yHash, newYHashNext, function(err) {
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return c(err);
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});
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});
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});
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},
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function(c) {
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if (!orphanizeFrom) return c();
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self.setBranchOrphan(orphanizeFrom, function(err) {
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return c(err);
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});
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},
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],
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function(err) {
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return cb(err);
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});
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};
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Sync.prototype.setBlockMain = function(hash, isMain, cb) {
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var self = this;
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self.bDb.setMain(hash, isMain, function(err) {
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if (err) return cb(err);
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return self.txDb.handleBlockChange(hash, isMain, cb);
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});
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};
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Sync.prototype.setBranchOrphan = function(fromHash, cb) {
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var self = this,
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hashInterator = fromHash;
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async.whilst(
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function() {
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return hashInterator;
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},
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function(c) {
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self.setBlockMain(hashInterator, false, function(err) {
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if (err) return cb(err);
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self.bDb.getNext(hashInterator, function(err, val) {
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hashInterator = val;
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return c(err);
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});
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});
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}, cb);
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};
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Sync.prototype.setBranchConnectedBackwards = function(fromHash, cb) {
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var self = this,
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hashInterator = fromHash,
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lastHash = fromHash,
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isMain;
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async.doWhilst(
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function(c) {
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self.setBlockMain(hashInterator, true, function(err) {
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if (err) return c(err);
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self.bDb.getPrev(hashInterator, function(err, val) {
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if (err) return c(err);
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lastHash = hashInterator;
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hashInterator = val;
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self.bDb.isMain(hashInterator, function(err, val) {
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isMain = val;
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return c();
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});
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});
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});
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},
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function() {
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return hashInterator && !isMain;
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},
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function(err) {
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console.log('\tFound yBlock:', hashInterator);
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return cb(err, hashInterator, lastHash);
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}
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);
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};
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Sync.prototype.storeTxs = function(txs, cb) {
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var self = this;
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self.txDb.createFromArray(txs, null, function(err) {
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if (err) return cb(err);
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return cb(err);
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});
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};
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module.exports = require('soop')(Sync);
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