813 lines
22 KiB
JavaScript
813 lines
22 KiB
JavaScript
'use strict';
|
|
|
|
var util = require('util');
|
|
var fs = require('fs');
|
|
var async = require('async');
|
|
var levelup = require('levelup');
|
|
var leveldown = require('leveldown');
|
|
var mkdirp = require('mkdirp');
|
|
var bitcore = require('bitcore-lib');
|
|
var BufferUtil = bitcore.util.buffer;
|
|
var Networks = bitcore.Networks;
|
|
var Block = bitcore.Block;
|
|
var $ = bitcore.util.preconditions;
|
|
var index = require('../');
|
|
var errors = index.errors;
|
|
var log = index.log;
|
|
var Transaction = require('../transaction');
|
|
var Service = require('../service');
|
|
|
|
/**
|
|
* This service synchronizes a leveldb database with bitcoin block chain by connecting and
|
|
* disconnecting blocks to build new indexes that can be queried. Other services can extend
|
|
* the data that is indexed by implementing a `blockHandler` method.
|
|
*
|
|
* @param {Object} options
|
|
* @param {Node} options.node - A reference to the node
|
|
* @param {Node} options.store - A levelup backend store
|
|
*/
|
|
function DB(options) {
|
|
/* jshint maxstatements: 20 */
|
|
|
|
if (!(this instanceof DB)) {
|
|
return new DB(options);
|
|
}
|
|
if (!options) {
|
|
options = {};
|
|
}
|
|
|
|
Service.call(this, options);
|
|
|
|
// Used to keep track of the version of the indexes
|
|
// to determine during an upgrade if a reindex is required
|
|
this.version = 2;
|
|
|
|
this.tip = null;
|
|
this.genesis = null;
|
|
|
|
$.checkState(this.node.network, 'Node is expected to have a "network" property');
|
|
this.network = this.node.network;
|
|
|
|
this._setDataPath();
|
|
|
|
this.maxOpenFiles = options.maxOpenFiles || DB.DEFAULT_MAX_OPEN_FILES;
|
|
this.maxTransactionLimit = options.maxTransactionLimit || DB.MAX_TRANSACTION_LIMIT;
|
|
|
|
this.levelupStore = leveldown;
|
|
if (options.store) {
|
|
this.levelupStore = options.store;
|
|
}
|
|
|
|
this.retryInterval = 60000;
|
|
|
|
this.subscriptions = {
|
|
transaction: [],
|
|
block: []
|
|
};
|
|
}
|
|
|
|
util.inherits(DB, Service);
|
|
|
|
DB.dependencies = ['bitcoind'];
|
|
|
|
DB.PREFIXES = {
|
|
VERSION: new Buffer('ff', 'hex'),
|
|
BLOCKS: new Buffer('01', 'hex'),
|
|
TIP: new Buffer('04', 'hex')
|
|
};
|
|
|
|
// The maximum number of transactions to query at once
|
|
// Used for populating previous inputs
|
|
DB.MAX_TRANSACTION_LIMIT = 5;
|
|
|
|
// The default maxiumum number of files open for leveldb
|
|
DB.DEFAULT_MAX_OPEN_FILES = 200;
|
|
|
|
/**
|
|
* This function will set `this.dataPath` based on `this.node.network`.
|
|
* @private
|
|
*/
|
|
DB.prototype._setDataPath = function() {
|
|
$.checkState(this.node.datadir, 'Node is expected to have a "datadir" property');
|
|
if (this.node.network === Networks.livenet) {
|
|
this.dataPath = this.node.datadir + '/bitcore-node.db';
|
|
} else if (this.node.network === Networks.testnet) {
|
|
if (this.node.network.regtestEnabled) {
|
|
this.dataPath = this.node.datadir + '/regtest/bitcore-node.db';
|
|
} else {
|
|
this.dataPath = this.node.datadir + '/testnet3/bitcore-node.db';
|
|
}
|
|
} else {
|
|
throw new Error('Unknown network: ' + this.network);
|
|
}
|
|
};
|
|
|
|
DB.prototype._checkVersion = function(callback) {
|
|
var self = this;
|
|
var options = {
|
|
keyEncoding: 'binary',
|
|
valueEncoding: 'binary'
|
|
};
|
|
self.store.get(DB.PREFIXES.TIP, options, function(err) {
|
|
if (err instanceof levelup.errors.NotFoundError) {
|
|
// The database is brand new and doesn't have a tip stored
|
|
// we can skip version checking
|
|
return callback();
|
|
} else if (err) {
|
|
return callback(err);
|
|
}
|
|
self.store.get(DB.PREFIXES.VERSION, options, function(err, buffer) {
|
|
var version;
|
|
if (err instanceof levelup.errors.NotFoundError) {
|
|
// The initial version (1) of the database didn't store the version number
|
|
version = 1;
|
|
} else if (err) {
|
|
return callback(err);
|
|
} else {
|
|
version = buffer.readUInt32BE();
|
|
}
|
|
if (self.version !== version) {
|
|
var helpUrl = 'https://github.com/bitpay/bitcore-node/blob/master/docs/services/db.md#how-to-reindex';
|
|
return callback(new Error(
|
|
'The version of the database "' + version + '" does not match the expected version "' +
|
|
self.version + '". A recreation of "' + self.dataPath + '" (can take several hours) is ' +
|
|
'required or to switch versions of software to match. Please see ' + helpUrl +
|
|
' for more information.'
|
|
));
|
|
}
|
|
callback();
|
|
});
|
|
});
|
|
};
|
|
|
|
DB.prototype._setVersion = function(callback) {
|
|
var versionBuffer = new Buffer(new Array(4));
|
|
versionBuffer.writeUInt32BE(this.version);
|
|
this.store.put(DB.PREFIXES.VERSION, versionBuffer, callback);
|
|
};
|
|
|
|
/**
|
|
* Called by Node to start the service.
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.start = function(callback) {
|
|
|
|
var self = this;
|
|
if (!fs.existsSync(this.dataPath)) {
|
|
mkdirp.sync(this.dataPath);
|
|
}
|
|
|
|
this.genesis = Block.fromBuffer(this.node.services.bitcoind.genesisBuffer);
|
|
this.store = levelup(this.dataPath, { db: this.levelupStore, maxOpenFiles: this.maxOpenFiles });
|
|
this.node.services.bitcoind.on('tx', this.transactionHandler.bind(this));
|
|
|
|
this.once('ready', function() {
|
|
log.info('Bitcoin Database Ready');
|
|
|
|
// Notify that there is a new tip
|
|
self.node.services.bitcoind.on('tip', function(height) {
|
|
if(!self.node.stopping) {
|
|
self.sync();
|
|
}
|
|
});
|
|
});
|
|
|
|
async.series([
|
|
function(next) {
|
|
self._checkVersion(next);
|
|
},
|
|
function(next) {
|
|
self._setVersion(next);
|
|
}
|
|
], function(err) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
self.loadTip(function(err) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
|
|
self.sync();
|
|
self.emit('ready');
|
|
setImmediate(callback);
|
|
});
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Called by Node to stop the service
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.stop = function(callback) {
|
|
var self = this;
|
|
|
|
// Wait until syncing stops and all db operations are completed before closing leveldb
|
|
async.whilst(function() {
|
|
return self.bitcoindSyncing;
|
|
}, function(next) {
|
|
setTimeout(next, 10);
|
|
}, function() {
|
|
self.store.close(callback);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Will give information about the database from bitcoin.
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.getInfo = function(callback) {
|
|
var self = this;
|
|
setImmediate(function() {
|
|
var info = self.node.bitcoind.getInfo();
|
|
callback(null, info);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Closes the underlying store database
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.close = function(callback) {
|
|
this.store.close(callback);
|
|
};
|
|
|
|
/**
|
|
* This function is responsible for emitting `db/transaction` events.
|
|
* @param {Object} txInfo - The data from the bitcoind.on('tx') event
|
|
* @param {Buffer} txInfo.buffer - The transaction buffer
|
|
* @param {Boolean} txInfo.mempool - If the transaction was accepted in the mempool
|
|
* @param {String} txInfo.hash - The hash of the transaction
|
|
*/
|
|
DB.prototype.transactionHandler = function(txInfo) {
|
|
var tx = Transaction().fromBuffer(txInfo.buffer);
|
|
for (var i = 0; i < this.subscriptions.transaction.length; i++) {
|
|
this.subscriptions.transaction[i].emit('db/transaction', {
|
|
rejected: !txInfo.mempool,
|
|
tx: tx
|
|
});
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Called by Node to determine the available API methods.
|
|
*/
|
|
DB.prototype.getAPIMethods = function() {
|
|
var methods = [
|
|
['getBlock', this, this.getBlock, 1],
|
|
['getBlockHashesByTimestamp', this, this.getBlockHashesByTimestamp, 2],
|
|
['getTransaction', this, this.getTransaction, 2],
|
|
['getTransactionWithBlockInfo', this, this.getTransactionWithBlockInfo, 2],
|
|
['sendTransaction', this, this.sendTransaction, 1],
|
|
['estimateFee', this, this.estimateFee, 1]
|
|
];
|
|
return methods;
|
|
};
|
|
|
|
DB.prototype.loadTip = function(callback) {
|
|
var self = this;
|
|
|
|
var options = {
|
|
keyEncoding: 'binary',
|
|
valueEncoding: 'binary'
|
|
};
|
|
|
|
self.store.get(DB.PREFIXES.TIP, options, function(err, tipData) {
|
|
if(err && err instanceof levelup.errors.NotFoundError) {
|
|
self.tip = self.genesis;
|
|
self.tip.__height = 0;
|
|
self.connectBlock(self.genesis, function(err) {
|
|
if(err) {
|
|
return callback(err);
|
|
}
|
|
|
|
self.emit('addblock', self.genesis);
|
|
callback();
|
|
});
|
|
return;
|
|
} else if(err) {
|
|
return callback(err);
|
|
}
|
|
|
|
var hash = tipData.toString('hex');
|
|
|
|
var times = 0;
|
|
async.retry({times: 3, interval: self.retryInterval}, function(done) {
|
|
self.getBlock(hash, function(err, tip) {
|
|
if(err) {
|
|
times++;
|
|
log.warn('Bitcoind does not have our tip (' + hash + '). Bitcoind may have crashed and needs to catch up.');
|
|
if(times < 3) {
|
|
log.warn('Retrying in ' + (self.retryInterval / 1000) + ' seconds.');
|
|
}
|
|
return done(err);
|
|
}
|
|
|
|
done(null, tip);
|
|
});
|
|
}, function(err, tip) {
|
|
if(err) {
|
|
log.warn('Giving up after 3 tries. Please report this bug to https://github.com/bitpay/bitcore-node/issues');
|
|
log.warn('Please reindex your database.');
|
|
return callback(err);
|
|
}
|
|
|
|
self.tip = tip;
|
|
var blockIndex = self.node.services.bitcoind.getBlockIndex(self.tip.hash);
|
|
if(!blockIndex) {
|
|
return callback(new Error('Could not get height for tip.'));
|
|
}
|
|
self.tip.__height = blockIndex.height;
|
|
callback();
|
|
});
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Will get a block from bitcoind and give a Bitcore Block
|
|
* @param {String|Number} hash - A block hash or block height
|
|
*/
|
|
DB.prototype.getBlock = function(hash, callback) {
|
|
this.node.services.bitcoind.getBlock(hash, function(err, blockBuffer) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
callback(null, Block.fromBuffer(blockBuffer));
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Get block hashes between two timestamps
|
|
* @param {Number} high - high timestamp, in seconds, inclusive
|
|
* @param {Number} low - low timestamp, in seconds, inclusive
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.getBlockHashesByTimestamp = function(high, low, callback) {
|
|
var self = this;
|
|
var hashes = [];
|
|
var lowKey;
|
|
var highKey;
|
|
|
|
try {
|
|
lowKey = this._encodeBlockIndexKey(low);
|
|
highKey = this._encodeBlockIndexKey(high);
|
|
} catch(e) {
|
|
return callback(e);
|
|
}
|
|
|
|
var stream = this.store.createReadStream({
|
|
gte: lowKey,
|
|
lte: highKey,
|
|
reverse: true,
|
|
valueEncoding: 'binary',
|
|
keyEncoding: 'binary'
|
|
});
|
|
|
|
stream.on('data', function(data) {
|
|
hashes.push(self._decodeBlockIndexValue(data.value));
|
|
});
|
|
|
|
var error;
|
|
|
|
stream.on('error', function(streamError) {
|
|
if (streamError) {
|
|
error = streamError;
|
|
}
|
|
});
|
|
|
|
stream.on('close', function() {
|
|
if (error) {
|
|
return callback(error);
|
|
}
|
|
callback(null, hashes);
|
|
});
|
|
|
|
return stream;
|
|
};
|
|
|
|
/**
|
|
* Will give a Bitcore Transaction from bitcoind by txid
|
|
* @param {String} txid - A transaction hash
|
|
* @param {Boolean} queryMempool - Include the mempool
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.getTransaction = function(txid, queryMempool, callback) {
|
|
this.node.services.bitcoind.getTransaction(txid, queryMempool, function(err, txBuffer) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
if (!txBuffer) {
|
|
return callback(new errors.Transaction.NotFound());
|
|
}
|
|
|
|
callback(null, Transaction().fromBuffer(txBuffer));
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Will give a Bitcore Transaction and populated information about the block included.
|
|
* @param {String} txid - A transaction hash
|
|
* @param {Boolean} queryMempool - Include the mempool
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.getTransactionWithBlockInfo = function(txid, queryMempool, callback) {
|
|
this.node.services.bitcoind.getTransactionWithBlockInfo(txid, queryMempool, function(err, obj) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
|
|
var tx = Transaction().fromBuffer(obj.buffer);
|
|
tx.__blockHash = obj.blockHash;
|
|
tx.__height = obj.height;
|
|
tx.__timestamp = obj.timestamp;
|
|
|
|
callback(null, tx);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Will send a transaction to the Bitcoin network.
|
|
* @param {Transaction} tx - An instance of a Bitcore Transaction
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.sendTransaction = function(tx, callback) {
|
|
var txString;
|
|
if (tx instanceof Transaction) {
|
|
txString = tx.serialize();
|
|
} else {
|
|
txString = tx;
|
|
}
|
|
|
|
try {
|
|
var txid = this.node.services.bitcoind.sendTransaction(txString);
|
|
return callback(null, txid);
|
|
} catch(err) {
|
|
return callback(err);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Will estimate fees for a transaction and give a result in
|
|
* satoshis per kilobyte. Similar to the bitcoind estimateFee method.
|
|
* @param {Number} blocks - The number of blocks for the transaction to be included.
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.estimateFee = function(blocks, callback) {
|
|
var self = this;
|
|
setImmediate(function() {
|
|
callback(null, self.node.services.bitcoind.estimateFee(blocks));
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Called by the Bus to determine the available events.
|
|
*/
|
|
DB.prototype.getPublishEvents = function() {
|
|
return [
|
|
{
|
|
name: 'db/transaction',
|
|
scope: this,
|
|
subscribe: this.subscribe.bind(this, 'transaction'),
|
|
unsubscribe: this.unsubscribe.bind(this, 'transaction')
|
|
},
|
|
{
|
|
name: 'db/block',
|
|
scope: this,
|
|
subscribe: this.subscribe.bind(this, 'block'),
|
|
unsubscribe: this.unsubscribe.bind(this, 'block')
|
|
}
|
|
];
|
|
};
|
|
|
|
DB.prototype.subscribe = function(name, emitter) {
|
|
this.subscriptions[name].push(emitter);
|
|
};
|
|
|
|
DB.prototype.unsubscribe = function(name, emitter) {
|
|
var index = this.subscriptions[name].indexOf(emitter);
|
|
if (index > -1) {
|
|
this.subscriptions[name].splice(index, 1);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Will give the previous hash for a block.
|
|
* @param {String} blockHash
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.getPrevHash = function(blockHash, callback) {
|
|
var blockIndex = this.node.services.bitcoind.getBlockIndex(blockHash);
|
|
setImmediate(function() {
|
|
if (blockIndex) {
|
|
callback(null, blockIndex.prevHash);
|
|
} else {
|
|
callback(new Error('Could not get prevHash, block not found'));
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Connects a block to the database and add indexes
|
|
* @param {Block} block - The bitcore block
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.connectBlock = function(block, callback) {
|
|
log.debug('DB handling new chain block');
|
|
this.runAllBlockHandlers(block, true, callback);
|
|
};
|
|
|
|
/**
|
|
* Disconnects a block from the database and removes indexes
|
|
* @param {Block} block - The bitcore block
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.disconnectBlock = function(block, callback) {
|
|
log.debug('DB removing chain block');
|
|
this.runAllBlockHandlers(block, false, callback);
|
|
};
|
|
|
|
/**
|
|
* Will collect all database operations for a block from other services that implement
|
|
* `blockHandler` methods and then save operations to the database.
|
|
* @param {Block} block - The bitcore block
|
|
* @param {Boolean} add - If the block is being added/connected or removed/disconnected
|
|
* @param {Function} callback
|
|
*/
|
|
DB.prototype.runAllBlockHandlers = function(block, add, callback) {
|
|
var self = this;
|
|
var operations = [];
|
|
|
|
// Notify block subscribers
|
|
for (var i = 0; i < this.subscriptions.block.length; i++) {
|
|
this.subscriptions.block[i].emit('db/block', block.hash);
|
|
}
|
|
|
|
// Update tip
|
|
var tipHash = add ? new Buffer(block.hash, 'hex') : BufferUtil.reverse(block.header.prevHash);
|
|
operations.push({
|
|
type: 'put',
|
|
key: DB.PREFIXES.TIP,
|
|
value: tipHash
|
|
});
|
|
|
|
// Update block index
|
|
operations.push({
|
|
type: add ? 'put' : 'del',
|
|
key: this._encodeBlockIndexKey(block.header.timestamp),
|
|
value: this._encodeBlockIndexValue(block.hash)
|
|
});
|
|
|
|
async.eachSeries(
|
|
this.node.services,
|
|
function(mod, next) {
|
|
if(mod.blockHandler) {
|
|
$.checkArgument(typeof mod.blockHandler === 'function', 'blockHandler must be a function');
|
|
|
|
mod.blockHandler.call(mod, block, add, function(err, ops) {
|
|
if (err) {
|
|
return next(err);
|
|
}
|
|
if (ops) {
|
|
$.checkArgument(Array.isArray(ops), 'blockHandler for ' + mod.name + ' returned non-array');
|
|
operations = operations.concat(ops);
|
|
}
|
|
next();
|
|
});
|
|
} else {
|
|
setImmediate(next);
|
|
}
|
|
},
|
|
function(err) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
|
|
log.debug('Updating the database with operations', operations);
|
|
self.store.batch(operations, callback);
|
|
}
|
|
);
|
|
};
|
|
|
|
DB.prototype._encodeBlockIndexKey = function(timestamp) {
|
|
$.checkArgument(timestamp >= 0 && timestamp <= 4294967295, 'timestamp out of bounds');
|
|
var timestampBuffer = new Buffer(4);
|
|
timestampBuffer.writeUInt32BE(timestamp);
|
|
return Buffer.concat([DB.PREFIXES.BLOCKS, timestampBuffer]);
|
|
};
|
|
|
|
DB.prototype._encodeBlockIndexValue = function(hash) {
|
|
return new Buffer(hash, 'hex');
|
|
};
|
|
|
|
DB.prototype._decodeBlockIndexValue = function(value) {
|
|
return value.toString('hex');
|
|
};
|
|
|
|
/**
|
|
* This function will find the common ancestor between the current chain and a forked block,
|
|
* by moving backwards on both chains until there is a meeting point.
|
|
* @param {Block} block - The new tip that forks the current chain.
|
|
* @param {Function} done - A callback function that is called when complete.
|
|
*/
|
|
DB.prototype.findCommonAncestor = function(block, done) {
|
|
|
|
var self = this;
|
|
|
|
var mainPosition = self.tip.hash;
|
|
var forkPosition = block.hash;
|
|
|
|
var mainHashesMap = {};
|
|
var forkHashesMap = {};
|
|
|
|
mainHashesMap[mainPosition] = true;
|
|
forkHashesMap[forkPosition] = true;
|
|
|
|
var commonAncestor = null;
|
|
|
|
async.whilst(
|
|
function() {
|
|
return !commonAncestor;
|
|
},
|
|
function(next) {
|
|
|
|
if(mainPosition) {
|
|
var mainBlockIndex = self.node.services.bitcoind.getBlockIndex(mainPosition);
|
|
if(mainBlockIndex && mainBlockIndex.prevHash) {
|
|
mainHashesMap[mainBlockIndex.prevHash] = true;
|
|
mainPosition = mainBlockIndex.prevHash;
|
|
} else {
|
|
mainPosition = null;
|
|
}
|
|
}
|
|
|
|
if(forkPosition) {
|
|
var forkBlockIndex = self.node.services.bitcoind.getBlockIndex(forkPosition);
|
|
if(forkBlockIndex && forkBlockIndex.prevHash) {
|
|
forkHashesMap[forkBlockIndex.prevHash] = true;
|
|
forkPosition = forkBlockIndex.prevHash;
|
|
} else {
|
|
forkPosition = null;
|
|
}
|
|
}
|
|
|
|
if(forkPosition && mainHashesMap[forkPosition]) {
|
|
commonAncestor = forkPosition;
|
|
}
|
|
|
|
if(mainPosition && forkHashesMap[mainPosition]) {
|
|
commonAncestor = mainPosition;
|
|
}
|
|
|
|
if(!mainPosition && !forkPosition) {
|
|
return next(new Error('Unknown common ancestor'));
|
|
}
|
|
|
|
setImmediate(next);
|
|
},
|
|
function(err) {
|
|
done(err, commonAncestor);
|
|
}
|
|
);
|
|
};
|
|
|
|
/**
|
|
* This function will attempt to rewind the chain to the common ancestor
|
|
* between the current chain and a forked block.
|
|
* @param {Block} block - The new tip that forks the current chain.
|
|
* @param {Function} done - A callback function that is called when complete.
|
|
*/
|
|
DB.prototype.syncRewind = function(block, done) {
|
|
|
|
var self = this;
|
|
|
|
self.findCommonAncestor(block, function(err, ancestorHash) {
|
|
if (err) {
|
|
return done(err);
|
|
}
|
|
log.warn('Reorg common ancestor found:', ancestorHash);
|
|
// Rewind the chain to the common ancestor
|
|
async.whilst(
|
|
function() {
|
|
// Wait until the tip equals the ancestor hash
|
|
return self.tip.hash !== ancestorHash;
|
|
},
|
|
function(removeDone) {
|
|
|
|
var tip = self.tip;
|
|
|
|
// TODO: expose prevHash as a string from bitcore
|
|
var prevHash = BufferUtil.reverse(tip.header.prevHash).toString('hex');
|
|
|
|
self.getBlock(prevHash, function(err, previousTip) {
|
|
if (err) {
|
|
removeDone(err);
|
|
}
|
|
|
|
// Undo the related indexes for this block
|
|
self.disconnectBlock(tip, function(err) {
|
|
if (err) {
|
|
return removeDone(err);
|
|
}
|
|
|
|
// Set the new tip
|
|
previousTip.__height = self.tip.__height - 1;
|
|
self.tip = previousTip;
|
|
self.emit('removeblock', tip);
|
|
removeDone();
|
|
});
|
|
|
|
});
|
|
|
|
}, done
|
|
);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* This function will synchronize additional indexes for the chain based on
|
|
* the current active chain in the bitcoin daemon. In the event that there is
|
|
* a reorganization in the daemon, the chain will rewind to the last common
|
|
* ancestor and then resume syncing.
|
|
*/
|
|
DB.prototype.sync = function() {
|
|
var self = this;
|
|
|
|
if (self.bitcoindSyncing || self.node.stopping || !self.tip) {
|
|
return;
|
|
}
|
|
|
|
self.bitcoindSyncing = true;
|
|
|
|
var height;
|
|
|
|
async.whilst(function() {
|
|
height = self.tip.__height;
|
|
return height < self.node.services.bitcoind.height && !self.node.stopping;
|
|
}, function(done) {
|
|
self.node.services.bitcoind.getBlock(height + 1, function(err, blockBuffer) {
|
|
if (err) {
|
|
return done(err);
|
|
}
|
|
|
|
var block = Block.fromBuffer(blockBuffer);
|
|
|
|
// TODO: expose prevHash as a string from bitcore
|
|
var prevHash = BufferUtil.reverse(block.header.prevHash).toString('hex');
|
|
|
|
if (prevHash === self.tip.hash) {
|
|
|
|
// This block appends to the current chain tip and we can
|
|
// immediately add it to the chain and create indexes.
|
|
|
|
// Populate height
|
|
block.__height = self.tip.__height + 1;
|
|
|
|
// Create indexes
|
|
self.connectBlock(block, function(err) {
|
|
if (err) {
|
|
return done(err);
|
|
}
|
|
self.tip = block;
|
|
log.debug('Chain added block to main chain');
|
|
self.emit('addblock', block);
|
|
setImmediate(done);
|
|
});
|
|
} else {
|
|
// This block doesn't progress the current tip, so we'll attempt
|
|
// to rewind the chain to the common ancestor of the block and
|
|
// then we can resume syncing.
|
|
log.warn('Beginning reorg! Current tip: ' + self.tip.hash + '; New tip: ' + block.hash);
|
|
self.syncRewind(block, function(err) {
|
|
if(err) {
|
|
return done(err);
|
|
}
|
|
|
|
log.warn('Reorg complete. New tip is ' + self.tip.hash);
|
|
done();
|
|
});
|
|
}
|
|
});
|
|
}, function(err) {
|
|
if (err) {
|
|
Error.captureStackTrace(err);
|
|
return self.node.emit('error', err);
|
|
}
|
|
|
|
if(self.node.stopping) {
|
|
self.bitcoindSyncing = false;
|
|
return;
|
|
}
|
|
|
|
if (self.node.services.bitcoind.isSynced()) {
|
|
self.bitcoindSyncing = false;
|
|
self.node.emit('synced');
|
|
} else {
|
|
self.bitcoindSyncing = false;
|
|
}
|
|
|
|
});
|
|
|
|
};
|
|
|
|
module.exports = DB;
|