fcoin/lib/bcoin/blockdb.js
Christopher Jeffrey 42818c0646 drop block subtype.
2016-02-24 07:08:02 -08:00

1378 lines
30 KiB
JavaScript

/**
* db.js - db object for bcoin
* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
* https://github.com/indutny/bcoin
*/
var bcoin = require('../bcoin');
var utils = bcoin.utils;
var assert = utils.assert;
var EventEmitter = require('events').EventEmitter;
var network = bcoin.protocol.network;
var fs = bcoin.fs;
/**
* BlockDB
*/
function BlockDB(options) {
var self = this;
var levelup;
if (!(this instanceof BlockDB))
return new BlockDB(options);
// Some lazy loading
levelup = require('levelup');
EventEmitter.call(this);
if (!options)
options = {};
this.file = options.indexFile;
bcoin.ensurePrefix();
if (!this.file)
this.file = bcoin.prefix + '/index-' + network.type + '.db';
this.options = options;
this.parser = new bcoin.protocol.parser();
this.data = new BlockData(options);
this.cache = {
unspent: new bcoin.lru(32 * 1024 * 1024),
tx: new bcoin.lru(32 * 1024 * 1024)
};
if (+process.env.BCOIN_FRESH === 1 && bcoin.cp)
bcoin.cp.execFileSync('rm', ['-rf', this.file], { stdio: 'ignore' });
this.index = new levelup(this.file, {
keyEncoding: 'ascii',
valueEncoding: 'binary',
createIfMissing: true,
errorIfExists: false,
compression: true,
cacheSize: 16 * 1024 * 1024,
writeBufferSize: 8 * 1024 * 1024,
// blockSize: 4 * 1024,
maxOpenFiles: 8192,
// blockRestartInterval: 16,
db: bcoin.isBrowser
? require('level-js')
: require('level' + 'down')
});
}
utils.inherits(BlockDB, EventEmitter);
BlockDB.prototype.close = function close(callback) {
var self = this;
this.index.close(function(err) {
if (err)
return callback(err);
self.data.closeAsync(function(err) {
if (err)
return callback(err);
return callback();
});
});
};
BlockDB.prototype.migrate = function migrate(blockSize, compression, callback) {
var options, db, pending, stream, total, done;
callback = utils.once(callback);
options = utils.merge({}, this.index.options);
if (blockSize != null)
options.blockSize = blockSize;
if (compression != null)
options.compression = compression;
options.maxOpenFiles = 60000;
utils.print('Migrating DB with options:');
utils.print(options);
db = levelup(this.file + '.migrated', options);
stream = this.index.createReadStream();
pending = 0;
total = 0;
function onPut(err) {
if (err)
return callback(err);
if (++total % 10000 === 0)
utils.print('%d written.', total);
pending--;
if (done && !pending)
callback();
}
stream.on('data', function(data) {
pending++;
db.put(data.key, data.value, onPut);
});
stream.on('error', function(err) {
callback(err);
});
stream.on('end', function() {
done = true;
if (!pending)
callback();
});
};
BlockDB.prototype.createOffset = function createOffset(size, offset, height) {
var buf = new Buffer(16);
utils.writeU32(buf, size, 0);
utils.writeU64(buf, offset, 4);
utils.writeU32(buf, height, 12);
return buf;
};
BlockDB.prototype.parseOffset = function parseOffset(data) {
// Avoid using bignumbers here to increase performance.
// This is safe because this number will never exceed
// 53 bits (up to 8.3 petabytes).
var hi = utils.readU32(data, 8);
var lo = utils.readU32(data, 4);
return {
size: utils.readU32(data, 0),
offset: (hi * 0x100000000) + lo,
height: utils.readU32(data, 12)
};
};
BlockDB.prototype.saveBlock = function saveBlock(block, callback) {
var self = this;
this.data.saveAsync(block._raw, function(err, data) {
var batch, blockOffset;
if (err)
return callback(err);
batch = self.index.batch();
blockOffset = self.createOffset(data.size, data.offset, block.height);
batch.put('b/b/' + block.hash('hex'), blockOffset);
batch.put('b/h/' + block.height, blockOffset);
block.txs.forEach(function(tx, i) {
var hash = tx.hash('hex');
var uniq = {};
var txOffset;
txOffset = self.createOffset(
tx._size,
data.offset + tx._offset,
block.height
);
batch.put('t/t/' + hash, txOffset);
tx.inputs.forEach(function(input) {
var type = input.getType();
var address = input.getAddress();
var uaddr;
if (input.isCoinbase())
return;
if (type === 'pubkey' || type === 'multisig')
address = null;
uaddr = address;
if (uaddr) {
if (!uniq[uaddr])
uniq[uaddr] = true;
else
uaddr = null;
}
if (uaddr)
batch.put('t/a/' + uaddr + '/' + hash, txOffset);
if (address) {
batch.del(
'u/a/' + address
+ '/' + input.prevout.hash
+ '/' + input.prevout.index);
}
batch.del('u/t/' + input.prevout.hash + '/' + input.prevout.index);
if (self.options.cache)
self.cache.unspent.remove(input.prevout.hash + '/' + input.prevout.index);
});
tx.outputs.forEach(function(output, i) {
var type = output.getType();
var address = output.getAddress();
var uaddr, coinOffset;
if (type === 'pubkey' || type === 'multisig')
address = null;
uaddr = address;
if (uaddr) {
if (!uniq[uaddr])
uniq[uaddr] = true;
else
uaddr = null;
}
coinOffset = self.createOffset(
output._size,
data.offset + tx._offset + output._offset,
block.height
);
if (uaddr)
batch.put('t/a/' + uaddr + '/' + hash, txOffset);
if (address)
batch.put('u/a/' + address + '/' + hash + '/' + i, coinOffset);
batch.put('u/t/' + hash + '/' + i, coinOffset);
});
});
batch.write(function(err) {
if (err)
return callback(err);
self.emit('save block', block);
return callback(null, block);
});
});
};
BlockDB.prototype.removeBlock = function removeBlock(hash, callback) {
var self = this;
this.getBlock(hash, function(err, block) {
var batch;
if (err)
return callback(err);
if (!block)
return callback();
batch = self.index.batch();
if (typeof hash === 'string')
assert(block.hash('hex') === hash);
batch.del('b/b/' + block.hash('hex'));
batch.del('b/h/' + block.height);
utils.forEach(block.txs, function(tx, next, i) {
var hash = tx.hash('hex');
var uniq = {};
if (self.options.cache)
self.cache.tx.remove(hash);
batch.del('t/t/' + hash);
self.fillTX(tx, function(err) {
if (err)
return next(err);
tx.inputs.forEach(function(input) {
var type = input.getType();
var address = input.getAddress();
var uaddr, coinOffset;
if (input.isCoinbase())
return;
if (type === 'pubkey' || type === 'multisig')
address = null;
uaddr = address;
if (uaddr) {
if (!uniq[uaddr])
uniq[uaddr] = true;
else
uaddr = null;
}
assert(input.output._fileOffset >= 0);
coinOffset = self.createOffset(
input.output._size,
input.output._fileOffset,
input.output.height
);
if (uaddr)
batch.del('t/a/' + uaddr + '/' + hash);
if (address) {
batch.put('u/a/' + address
+ '/' + input.prevout.hash
+ '/' + input.prevout.index,
coinOffset);
}
batch.put('u/t/'
+ input.prevout.hash
+ '/' + input.prevout.index,
coinOffset);
});
tx.outputs.forEach(function(output, i) {
var type = output.getType();
var address = output.getAddress();
var uaddr;
if (type === 'pubkey' || type === 'multisig')
address = null;
uaddr = address;
if (uaddr) {
if (!uniq[uaddr])
uniq[uaddr] = true;
else
uaddr = null;
}
if (uaddr)
batch.del('t/a/' + uaddr + '/' + hash);
if (address)
batch.del('u/a/' + address + '/' + hash + '/' + i);
batch.del('u/t/' + hash + '/' + i);
if (self.options.cache)
self.cache.unspent.remove(hash + '/' + i);
});
next();
});
}, function(err) {
if (err)
return callback(err);
batch.write(function(err) {
if (err)
return callback(err);
// TODO: Add check to make sure we
// can ONLY remove the last block.
assert(block._fileOffset >= 0);
assert(block._fileOffset < self.data.size);
self.emit('remove block', block);
return callback(null, block);
// XXX This seems to be truncating too much right now
self.data.truncateAsync(block._fileOffset, function(err) {
if (err)
return callback(err);
self.emit('remove block', block);
return callback(null, block);
});
});
});
});
};
BlockDB.prototype.fillCoins = function fillCoins(txs, callback) {
var self = this;
var pending = txs.length;
callback = utils.asyncify(callback);
utils.forEach(txs, function(tx, next) {
self.fillCoin(tx, function(err) {
if (err)
return next(err);
next();
});
}, callback);
};
BlockDB.prototype.fillTXs = function fillTXs(txs, callback) {
var self = this;
callback = utils.asyncify(callback);
utils.forEach(txs, function(err, next) {
self.fillTX(tx, function(err) {
if (err)
return next(err);
next();
});
}, callback);
};
BlockDB.prototype.fillCoin = function fillCoin(tx, callback) {
var self = this;
callback = utils.asyncify(callback);
if (tx.isCoinbase())
return callback();
utils.forEach(tx.inputs, function(input, next) {
if (input.output)
return next();
self.getCoin(input.prevout.hash, input.prevout.index, function(err, coin) {
if (err)
return callback(err);
if (coin)
input.output = coin;
next();
});
}, function(err) {
if (err)
return callback(err);
return callback(null, tx);
});
};
BlockDB.prototype.fillTX = function fillTX(tx, callback) {
var self = this;
callback = utils.asyncify(callback);
if (tx.isCoinbase())
return callback();
utils.forEach(tx.inputs, function(input, next) {
if (input.output)
return next();
self.getTX(input.prevout.hash, function(err, tx) {
if (err)
return next(err);
if (tx) {
input.output = bcoin.coin(tx, input.prevout.index);
input.output._fileOffset = tx._fileOffset + input.output._offset;
}
next();
});
}, function(err) {
if (err)
return callback(err);
return callback(null, tx);
});
};
BlockDB.prototype.getCoinsByAddress = function getCoinsByAddress(addresses, options, callback) {
var self = this;
var coins = [];
if (!callback) {
callback = options;
options = {};
}
if (typeof addresses === 'string')
addresses = [addresses];
addresses = utils.uniqs(addresses);
utils.forEach(addresses, function(address, done) {
var iter = self.index.db.iterator({
gte: 'u/a/' + address,
lte: 'u/a/' + address + '~',
keys: true,
values: true,
fillCache: true,
keyAsBuffer: false,
valueAsBuffer: true
});
(function next() {
iter.next(function(err, key, value) {
var record, parts, hash, index;
if (err) {
return iter.end(function() {
done(err);
});
}
// iter.end() here?
if (!key)
return done();
parts = key.split('/');
hash = parts[3];
index = +parts[4];
record = self.parseOffset(value);
self.data.getAsync(record.size, record.offset, function(err, data) {
var coin;
if (err) {
return iter.end(function() {
done(err);
});
}
if (!data)
return done();
try {
data = self.parser.parseOutput(data);
} catch (e) {
return iter.end(function() {
done(e);
});
}
coin = bcoin.coin({
version: 1,
hash: hash,
index: index,
height: record.height,
script: data.script,
value: data.value,
spent: false
});
if (self.options.cache)
self.cache.unspent.set(id, coin);
coins.push(coin);
next();
});
});
})();
}, function(err) {
if (err)
return callback(err);
return callback(null, coins);
});
};
BlockDB.prototype.getCoin = function getCoin(hash, index, callback) {
var self = this;
var id = 'u/t/' + hash + '/' + index;
this.index.get(id, function(err, record) {
if (err) {
if (err.type === 'NotFoundError')
return callback();
return callback(err);
}
record = self.parseOffset(record);
self.data.getAsync(record.size, record.offset, function(err, data) {
var coin;
if (err)
return callback(err);
if (!data)
return callback();
try {
data = self.parser.parseOutput(data);
} catch (e) {
return callback(e);
}
coin = bcoin.coin({
version: 1,
hash: hash,
index: index,
height: record.height,
script: data.script,
value: data.value,
spent: false
});
return callback(null, coin);
});
});
};
BlockDB.prototype.getTXByAddress = function getTXByAddress(addresses, options, callback) {
var self = this;
var txs = [];
var have = {};
if (!callback) {
callback = options;
options = {};
}
if (typeof addresses === 'string')
addresses = [addresses];
addresses = utils.uniqs(addresses);
utils.forEach(addresses, function(address, done) {
var iter = self.index.db.iterator({
gte: 't/a/' + address,
lte: 't/a/' + address + '~',
keys: true,
values: true,
fillCache: true,
keyAsBuffer: false,
valueAsBuffer: true
});
(function next() {
iter.next(function(err, key, value) {
var record, hash, index;
if (err) {
return iter.end(function() {
done(err);
});
}
// iter.end() here?
if (!key)
return done();
hash = key.split('/')[3];
record = self.parseOffset(value);
if (addresses.length > 1) {
if (have[hash])
return next();
have[hash] = true;
}
if (self.options.cache && self.cache.tx.has(hash)) {
txs.push(self.cache.tx.get(hash));
return done();
}
self.data.getAsync(record.size, record.offset, function(err, data) {
var coin;
if (err) {
return iter.end(function() {
done(err);
});
}
if (!data)
return next();
try {
tx = self.parser.parseTX(data);
tx = new bcoin.tx(tx);
} catch (e) {
return iter.end(function() {
done(e);
});
}
return self._getEntry(record.height, function(err, entry) {
if (err) {
return iter.end(function() {
done(err);
});
}
tx.height = record.height;
if (entry) {
tx.ts = entry.ts;
tx.block = entry.hash;
}
txs.push(tx);
if (self.options.cache)
self.cache.tx.set(hash, tx);
if (self.options.paranoid && tx.hash('hex') !== hash)
return next(new Error('BlockDB is corrupt. All is lost.'));
next();
});
});
});
})();
}, function(err) {
if (err)
return callback(err);
return callback(null, txs);
});
};
BlockDB.prototype.getTX = function getTX(hash, callback) {
var self = this;
var id = 't/t/' + hash;
this.index.get(id, function(err, record) {
if (err) {
if (err.type === 'NotFoundError')
return callback();
return callback(err);
}
record = self.parseOffset(record);
self.data.getAsync(record.size, record.offset, function(err, data) {
var tx;
if (err)
return callback(err);
if (data) {
try {
tx = self.parser.parseTX(data);
tx = new bcoin.tx(tx);
} catch (e) {
return callback(e);
}
return self._getEntry(record.height, function(err, entry) {
if (err)
return callback(err);
tx.height = record.height;
if (entry) {
tx.ts = entry.ts;
tx.block = entry.hash;
}
tx._fileOffset = record.offset;
if (self.options.paranoid && tx.hash('hex') !== hash)
return callback(new Error('BlockDB is corrupt. All is lost.'));
return callback(null, tx);
});
}
return callback(null, tx);
});
});
};
BlockDB.prototype.getBlock = function getBlock(hash, callback) {
var self = this;
var id = 'b/b/' + hash;
if (typeof hash === 'number')
id = 'b/h/' + hash;
this.index.get(id, function(err, record) {
if (err) {
if (err.type === 'NotFoundError')
return callback();
return callback(err);
}
record = self.parseOffset(record);
self.data.getAsync(record.size, record.offset, function(err, data) {
var block;
if (err)
return callback(err);
if (data) {
try {
block = self.parser.parseBlock(data);
block = new bcoin.block(block, 'block');
} catch (e) {
return callback(e);
}
block._fileOffset = record.offset;
block.height = record.height;
block.txs.forEach(function(tx) {
tx.height = block.height;
});
if (self.options.paranoid) {
if (typeof hash === 'number') {
self._getEntry(hash, function(err, entry) {
if (err)
return callback(err);
if (!entry)
return callback(null, block);
if (block.hash('hex') !== entry.hash)
return callback(new Error('BlockDB is corrupt. All is lost.'));
return callback(null, block);
});
return;
}
if (block.hash('hex') !== hash)
return callback(new Error('BlockDB is corrupt. All is lost.'));
}
}
return callback(null, block);
});
});
};
BlockDB.prototype.hasBlock = function hasBlock(hash, callback) {
var self = this;
var id = 'b/b/' + hash;
if (typeof hash === 'number')
id = 'b/h/' + hash;
this.index.get(id, function(err, record) {
if (err && err.type !== 'NotFoundError')
return callback(err);
if (!record)
return callback(null, false);
record = self.parseOffset(record);
if (self.data.size < record.offset + record.size)
return callback(null, false);
return callback(null, true);
});
};
BlockDB.prototype.hasCoin = function hasCoin(hash, index, callback) {
var self = this;
var id = 'u/t/' + hash + '/' + index;
this.index.get(id, function(err, record) {
if (err && err.type !== 'NotFoundError')
return callback(err);
if (!record)
return callback(null, false);
record = self.parseOffset(record);
if (self.data.size < record.offset + record.size)
return callback(null, false);
return callback(null, true);
});
};
// For BIP30
// https://bitcointalk.org/index.php?topic=67738.0
BlockDB.prototype.hasUnspentTX = function hasUnspentTX(hash, callback) {
var self = this;
this.getTX(hash, function(err, tx) {
var hash, spent;
if (err)
return callback(err);
if (!tx)
return callback(null, false);
hash = tx.hash('hex');
spent = 0;
utils.forEach(tx.outputs, function(output, next, i) {
self.isSpent(hash, i, function(err, result) {
if (err)
return next(err);
if (result)
spent++;
next();
});
});
}, function(err) {
if (err)
return callback(err);
return callback(null, spent < tx.outputs.length);
});
};
BlockDB.prototype.hasTX = function hasTX(hash, callback) {
var self = this;
var id = 't/t/' + hash;
this.index.get(id, function(err, record) {
if (err && err.type !== 'NotFoundError')
return callback(err);
if (!record)
return callback(null, false);
record = self.parseOffset(record);
if (self.data.size < record.offset + record.size)
return callback(null, false);
return callback(null, true);
});
};
BlockDB.prototype.isSpent = function isSpent(hash, index, callback) {
return this.hasCoin(hash, index, function(err, result) {
if (err)
return callback(err);
return callback(null, !result);
});
};
BlockDB.prototype.getHeight = function getHeight(callback) {
var self = this;
var maxHeight = -1;
var iter;
iter = this.index.db.iterator({
gte: 'b/h',
lte: 'b/h~',
keys: true,
values: false,
fillCache: false,
keyAsBuffer: false
});
(function next() {
iter.next(function(err, key, value) {
var height;
if (err) {
return iter.end(function() {
return callback(err);
});
}
// iter.end() here?
if (!key)
return callback(null, maxHeight);
height = +key.split('/')[2];
if (height > maxHeight)
maxHeight = height;
next();
});
})();
};
BlockDB.prototype.resetHeight = function resetHeight(height, callback, emit) {
var self = this;
this.getHeight(function(err, currentHeight) {
if (err)
return callback(err);
if (currentHeight < height)
return callback(new Error('Cannot reset to height ' + height));
(function next() {
if (currentHeight === height)
return callback();
self.removeBlock(currentHeight, function(err, block) {
if (err)
return callback(err);
// Emit the blocks we removed.
if (emit && block)
emit(block);
currentHeight--;
next();
});
})();
});
};
BlockDB.prototype._getEntry = function _getEntry(height, callback) {
if (!bcoin.chain.global)
return callback();
return bcoin.chain.global.db.getAsync(height, callback);
};
/**
* BlockData
*/
function BlockData(options) {
if (!(this instanceof BlockData))
return new BlockData(options);
if (!options)
options = {};
this.options = options;
this.file = options.blockFile;
bcoin.ensurePrefix();
if (!this.file)
this.file = bcoin.prefix + '/block-' + network.type + '.db';
this.bufferPool = { used: {} };
this.size = 0;
this.fd = null;
this._init();
}
BlockData.prototype._init = function _init() {
if (!bcoin.fs) {
utils.debug('`fs` module not available. Falling back to ramdisk.');
this.ramdisk = new bcoin.ramdisk(40 * 1024 * 1024);
return;
}
if (+process.env.BCOIN_FRESH === 1) {
try {
fs.unlinkSync(this.file);
} catch (e) {
;
}
}
if (!this.exists())
fs.writeFileSync(this.file, new Buffer([]));
this.size = this.getFileSize();
this.fd = fs.openSync(this.file, 'r+');
};
BlockData.prototype.closeSync = function closeSync() {
if (!bcoin.fs) {
this.ramdisk = null;
return;
}
fs.closeSync(this.fd);
this.fd = null;
};
BlockData.prototype.closeAsync = function closeAsync(callback) {
var self = this;
callback = utils.asyncify(callback);
if (!bcoin.fs) {
this.ramdisk = null;
return callback();
}
fs.close(this.fd, function(err) {
if (err)
return callback(err);
self.fd = null;
return callback();
});
};
BlockData.prototype._malloc = function _malloc(size) {
if (!this.options.usePool)
return new Buffer(size);
if (size > 500)
return new Buffer(size);
if (!this.bufferPool[size])
this.bufferPool[size] = new Buffer(size);
if (this.bufferPool.used[size] === this.bufferPool[size])
return new Buffer(size);
this.bufferPool.used[size] = this.bufferPool[size];
return this.bufferPool[size];
};
BlockData.prototype._free = function _free(buf) {
if (!this.options.usePool)
return;
if (this.bufferPool.used[buf.length] === buf) {
assert(this.bufferPool[buf.length] === buf);
delete this.bufferPool.used[buf.length];
}
};
BlockData.prototype.exists = function exists() {
if (!bcoin.fs)
return true;
try {
fs.statSync(this.file);
return true;
} catch (e) {
return false;
}
};
BlockData.prototype.getFileSize = function getFileSize() {
if (!bcoin.fs)
return this.ramdisk.size;
try {
return fs.statSync(this.file).size;
} catch (e) {
return 0;
}
};
BlockData.prototype.getSync = function getSync(size, offset) {
return this._readSync(size, offset);
};
BlockData.prototype.getAsync = function getAsync(size, offset, callback) {
var self = this;
callback = utils.asyncify(callback);
return this._readAsync(size, offset, callback);
};
BlockData.prototype.saveSync = function saveSync(data) {
var self = this;
var offset = this.size;
this._writeSync(data, offset);
return { size: data.length, offset: offset };
};
BlockData.prototype.saveAsync = function saveAsync(data, callback) {
var self = this;
var offset = this.size;
callback = utils.asyncify(callback);
return this._writeAsync(data, offset, function(err, success) {
if (err)
return callback(err);
return callback(null, { size: data.length, offset: offset });
});
};
BlockData.prototype.truncateSync = function truncateSync(size) {
if (!bcoin.fs) {
this.ramdisk.truncate(size);
this.size = size;
return;
}
fs.ftruncateSync(this.fd, size);
this.size = size;
};
BlockData.prototype.truncateAsync = function truncateAsync(size, callback) {
var self = this;
callback = utils.asyncify(callback);
if (!bcoin.fs) {
this.ramdisk.truncate(size);
this.size = size;
return callback();
}
fs.ftruncate(this.fd, size, function(err) {
if (err)
return callback(err);
self.size = size;
return callback();
});
};
BlockData.prototype._ioError = function _ioError(name, size, offset) {
return new Error(name
+ '() failed at offset '
+ offset
+ ' with '
+ size
+ ' bytes left.');
};
BlockData.prototype._readSync = function _readSync(size, offset) {
var index = 0;
var data, bytes;
if (offset < 0 || offset == null)
return;
if (!bcoin.fs)
return this.ramdisk.read(size, offset);
data = this._malloc(size);
try {
while (bytes = fs.readSync(this.fd, data, index, size, offset)) {
index += bytes;
size -= bytes;
offset += bytes;
if (index === data.length) {
this._free(data);
return data;
}
}
} catch (e) {
this._free(data);
throw e;
}
this._free(data);
throw this._ioError('_readSync', size, offset);
};
BlockData.prototype._readAsync = function _readAsync(size, offset, callback) {
var self = this;
var index = 0;
var data, bytes;
callback = utils.asyncify(callback);
if (offset < 0 || offset == null)
return callback();
if (!bcoin.fs)
return callback(null, this.ramdisk.read(size, offset));
data = this._malloc(size);
(function next() {
fs.read(self.fd, data, index, size, offset, function(err, bytes) {
if (err) {
self._free(data);
return callback(err);
}
if (!bytes)
return callback(self._ioError('_readAsync', size, offset));
index += bytes;
size -= bytes;
offset += bytes;
if (index === data.length) {
self._free(data);
return callback(null, data);
}
next();
});
})();
};
BlockData.prototype._writeSync = function _writeSync(data, offset) {
var size = data.length;
var added = Math.max(0, (offset + data.length) - this.size);
var index = 0;
var bytes;
if (offset < 0 || offset == null)
return false;
if (!bcoin.fs) {
this.size += added;
this.ramdisk.write(data, offset);
return;
}
try {
while (bytes = fs.writeSync(this.fd, data, index, size, offset)) {
index += bytes;
size -= bytes;
offset += bytes;
if (index === data.length) {
this.size += added;
return true;
}
}
} catch (e) {
throw e;
}
fs.fsyncSync(this.fd);
throw this._ioError('_writeSync', size, offset);
};
BlockData.prototype._writeAsync = function _writeAsync(data, offset, callback) {
var self = this;
var added = Math.max(0, (offset + data.length) - this.size);
var size = data.length;
var index = 0;
callback = utils.asyncify(callback);
if (offset < 0 || offset == null)
return callback(null, false);
if (!bcoin.fs) {
this.size += added;
this.ramdisk.write(data, offset);
return callback(null, true);
}
this.size += added;
(function next() {
fs.write(self.fd, data, index, size, offset, function(err, bytes) {
if (err) {
self.size -= (added - index);
return callback(err);
}
if (!bytes)
return callback(self._ioError('_writeAsync', size, offset));
index += bytes;
size -= bytes;
offset += bytes;
if (index === data.length) {
return fs.fsync(self.fd, function(err) {
if (err)
return callback(err);
return callback(null, true);
});
}
next();
});
})();
};
/**
* Expose
*/
module.exports = BlockDB;