node-libcoin/Transaction.js at master · UnsupportedCallbackException/node-libcoin · GitHub

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require('classtool');

function spec(b) {

var config = b.config || require('./config');

var log = b.log || require('./util/log');

var Script = b.Script || require('./Script').class();

var ScriptInterpreter = b.ScriptInterpreter || require('./ScriptInterpreter').class();

var util = b.util || require('./util/util');

var bignum = b.bignum || require('bignum');

var Put = b.Put || require('bufferput');

var Parser = b.Parser || require('./util/BinaryParser').class();

var Step = b.Step || require('step');

var error = b.error || require('./util/error');

var VerificationError = error.VerificationError;

var MissingSourceError = error.MissingSourceError;

var COINBASE_OP = util.NULL_HASH.concat(new Buffer("FFFFFFFF", 'hex'));

function TransactionIn(data) {

if ("object" !== typeof data) {

data = {};

}

if (data.o) {

this.o = data.o;

}

this.s = Buffer.isBuffer(data.s) ? data.s :

Buffer.isBuffer(data.script) ? data.script : util.EMPTY_BUFFER;

this.q = data.q ? data.q : data.sequence;

};

TransactionIn.prototype.getScript = function getScript() {

return new Script(this.s);

};

TransactionIn.prototype.isCoinBase = function isCoinBase() {

return this.o.compare(COINBASE_OP) === 0;

};

TransactionIn.prototype.serialize = function serialize() {

var slen = util.varIntBuf(this.s.length);

var qbuf = new Buffer(4);

qbuf.writeUInt32LE(this.q, 0);

return Buffer.concat([this.o, slen, this.s, qbuf]);

};

TransactionIn.prototype.getOutpointHash = function getOutpointHash() {

if ("undefined" !== typeof this.o.outHashCache) {

return this.o.outHashCache;

}

return this.o.outHashCache = this.o.slice(0, 32);

};

TransactionIn.prototype.getOutpointIndex = function getOutpointIndex() {

return (this.o[32] ) +

(this.o[33] << 8) +

(this.o[34] << 16) +

(this.o[35] << 24);

};

TransactionIn.prototype.setOutpointIndex = function setOutpointIndex(n) {

this.o[32] = n & 0xff;

this.o[33] = n >> 8 & 0xff;

this.o[34] = n >> 16 & 0xff;

this.o[35] = n >> 24 & 0xff;

};

function TransactionOut(data) {

if ("object" !== typeof data) {

data = {};

}

this.v = data.v ? data.v : data.value;

this.s = data.s ? data.s : data.script;

};

TransactionOut.prototype.getValue = function getValue() {

return new Parser(this.v).word64lu();

};

TransactionOut.prototype.getScript = function getScript() {

return new Script(this.s);

};

TransactionOut.prototype.serialize = function serialize() {

var slen = util.varIntBuf(this.s.length);

return Buffer.concat([this.v, slen, this.s]);

};

function Transaction(data) {

if ("object" !== typeof data) {

data = {};

}

this.hash = data.hash || null;

this.version = data.version;

this.lock_time = data.lock_time;

this.ins = Array.isArray(data.ins) ? data.ins.map(function (data) {

var txin = new TransactionIn();

txin.s = data.s;

txin.q = data.q;

txin.o = data.o;

return txin;

}) : [];

this.outs = Array.isArray(data.outs) ? data.outs.map(function (data) {

var txout = new TransactionOut();

txout.v = data.v;

txout.s = data.s;

return txout;

}) : [];

if (data.buffer) this._buffer = data.buffer;

};

this.class = Transaction;

Transaction.In = TransactionIn;

Transaction.Out = TransactionOut;

Transaction.prototype.isCoinBase = function () {

return this.ins.length == 1 && this.ins[0].isCoinBase();

};

Transaction.prototype.isStandard = function isStandard() {

var i;

for (i = 0; i < this.ins.length; i++) {

if (this.ins[i].getScript().getInType() == "Strange") {

return false;

}

for (i = 0; i < this.outs.length; i++) {

if (this.outs[i].getScript().getOutType() == "Strange") {

return false;

}

return true;

};

Transaction.prototype.serialize = function serialize() {

var bufs = [];

var buf = new Buffer(4);

buf.writeUInt32LE(this.version, 0);

bufs.push(buf);

bufs.push(util.varIntBuf(this.ins.length));

this.ins.forEach(function (txin) {

bufs.push(txin.serialize());

});

bufs.push(util.varIntBuf(this.outs.length));

this.outs.forEach(function (txout) {

bufs.push(txout.serialize());

});

var buf = new Buffer(4);

buf.writeUInt32LE(this.lock_time, 0);

bufs.push(buf);

return this._buffer = Buffer.concat(bufs);

};

Transaction.prototype.getBuffer = function getBuffer() {

if (this._buffer) return this._buffer;

return this.serialize();

};

Transaction.prototype.calcHash = function calcHash() {

return util.twoSha256(this.getBuffer());

};

Transaction.prototype.checkHash = function checkHash() {

if (!this.hash || !this.hash.length) return false;

return this.calcHash().compare(this.hash) == 0;

};

Transaction.prototype.getHash = function getHash() {

if (!this.hash || !this.hash.length) {

this.hash = this.calcHash();

}

return this.hash;

};

// convert encoded list of inputs to easy-to-use JS list-of-lists

Transaction.prototype.inputs = function inputs() {

var res = [];

for (var i = 0; i < this.ins.length; i++) {

var txin = this.ins[i];

var outHash = txin.getOutpointHash();

var outIndex = txin.getOutpointIndex();

res.push([outHash, outIndex]);

}

return res;

}

/**

* Load and cache transaction inputs.

* This function will try to load the inputs for a transaction.

* @param {BlockChain} blockChain A reference to the BlockChain object.

* @param {TransactionMap|null} txStore Additional transactions to consider.

* @param {Boolean} wait Whether to keep trying until the dependencies are

* met (or a timeout occurs.)

* @param {Function} callback Function to call on completion.

Transaction.prototype.cacheInputs =

function cacheInputs(blockChain, txStore, wait, callback) {

var self = this;

var txCache = new TransactionInputsCache(this);

txCache.buffer(blockChain, txStore, wait, callback);

};

Transaction.prototype.verify = function verify(txCache, blockChain, callback) {

var self = this;

var txIndex = txCache.txIndex;

var outpoints = [];

var valueIn = bignum(0);

var valueOut = bignum(0);

function getTxOut(txin, n) {

var outHash = txin.getOutpointHash();

var outIndex = txin.getOutpointIndex();

var outHashBase64 = outHash.toString('base64');

var fromTxOuts = txIndex[outHashBase64];

if (!fromTxOuts) {

throw new MissingSourceError(

"Source tx " + util.formatHash(outHash) +

" for inputs " + n + " not found",

// We store the hash of the missing tx in the error

// so that the txStore can watch out for it.

outHash.toString('base64')

);

}

var txout = fromTxOuts[outIndex];

if (!txout) {

throw new Error("Source output index "+outIndex+

" for input "+n+" out of bounds");

}

return txout;

};

Step(

function verifyInputs() {

var group = this.group();

if (self.isCoinBase()) {

throw new Error("Coinbase tx are invalid unless part of a block");

}

self.ins.forEach(function (txin, n) {

var txout = getTxOut(txin, n);

// TODO: Verify coinbase maturity

valueIn = valueIn.add(util.valueToBigInt(txout.v));

outpoints.push(txin.o);

self.verifyInput(n, txout.getScript(), group());

});

function verifyInputsResults(err, results) {

if (err) throw err;

for (var i = 0, l = results.length; i < l; i++) {

if (!results[i]) {

var txout = getTxOut(self.ins[i]);

log.debug('Script evaluated to false');

log.debug('|- scriptSig', ""+self.ins[i].getScript());

log.debug('`- scriptPubKey', ""+txout.getScript());

throw new VerificationError('Script for input '+i+' evaluated to false');

}

this();

function queryConflicts(err) {

if (err) throw err;

// Make sure there are no other transactions spending the same outs

blockChain.countConflictingTransactions(outpoints, this);

function checkConflicts(err, count) {

if (err) throw err;

self.outs.forEach(function (txout) {

valueOut = valueOut.add(util.valueToBigInt(txout.v));

});

if (valueIn.cmp(valueOut) < 0) {

var outValue = util.formatValue(valueOut);

var inValue = util.formatValue(valueIn);

throw new Error("Tx output value (BTC "+outValue+") "+

"exceeds input value (BTC "+inValue+")");

}

var fees = valueIn.sub(valueOut);

if (count) {

// Spent output detected, retrieve transaction that spends it

blockChain.getConflictingTransactions(outpoints, function (err, results) {

if (results.length) {

if (results[0].getHash().compare(self.getHash()) == 0) {

log.warn("Detected tx re-add (recoverable db corruption): "

+ util.formatHashAlt(results[0].getHash()));

// TODO: Needs to return an error for the memory pool case?

callback(null, fees);

} else {

callback(new Error("At least one referenced output has"

+ " already been spent in tx "

+ util.formatHashAlt(results[0].getHash())));

}

} else {

callback(new Error("Outputs of this transaction are spent, but "+

"the transaction(s) that spend them are not "+

"available. This probably means you need to "+

"reset your database."));

}

});

return;

}

// Success

this(null, fees);

callback

);

};

Transaction.prototype.verifyInput = function verifyInput(n, scriptPubKey, callback) {

return ScriptInterpreter.verify(this.ins[n].getScript(),

scriptPubKey,

this, n, 0,

callback);

};

/**

* Returns an object containing all pubkey hashes affected by this transaction.

* The return object contains the base64-encoded pubKeyHash values as keys

* and the original pubKeyHash buffers as values.

Transaction.prototype.getAffectedKeys = function getAffectedKeys(txCache) {

// TODO: Function won't consider results cached if there are no affected

// accounts.

if (!(this.affects && this.affects.length)) {

this.affects = [];

// Index any pubkeys affected by the outputs of this transaction

for (var i = 0, l = this.outs.length; i < l; i++) {

try {

var txout = this.outs[i];

var script = txout.getScript();

var outPubKey = script.simpleOutPubKeyHash();

if (outPubKey) {

this.affects.push(outPubKey);

}

} catch (err) {

// It's not our job to validate, so we just ignore any errors and issue

// a very low level log message.

log.debug("Unable to determine affected pubkeys: " +

(err.stack ? err.stack : ""+err));

}

};

// Index any pubkeys affected by the inputs of this transaction

var txIndex = txCache.txIndex;

for (var i = 0, l = this.ins.length; i < l; i++) {

try {

var txin = this.ins[i];

if (txin.isCoinBase()) continue;

// In the case of coinbase or IP transactions, the txin doesn't

// actually contain the pubkey, so we look at the referenced txout

// instead.

var outHash = txin.getOutpointHash();

var outIndex = txin.getOutpointIndex();

var outHashBase64 = outHash.toString('base64');

var fromTxOuts = txIndex[outHashBase64];

if (!fromTxOuts) {

throw new Error("Input not found!");

}

var txout = fromTxOuts[outIndex];

var script = txout.getScript();

var outPubKey = script.simpleOutPubKeyHash();

if (outPubKey) {

this.affects.push(outPubKey);

}

} catch (err) {

// It's not our job to validate, so we just ignore any errors and issue

// a very low level log message.

log.debug("Unable to determine affected pubkeys: " +

(err.stack ? err.stack : ""+err));

}

var affectedKeys = {};

this.affects.forEach(function (pubKeyHash) {

affectedKeys[pubKeyHash.toString('base64')] = pubKeyHash;

});

return affectedKeys;

};

var OP_CODESEPARATOR = 171;

var SIGHASH_ALL = 1;

var SIGHASH_NONE = 2;

var SIGHASH_SINGLE = 3;

var SIGHASH_ANYONECANPAY = 80;

Transaction.prototype.hashForSignature =

function hashForSignature(script, inIndex, hashType) {

if (+inIndex !== inIndex ||

inIndex < 0 || inIndex >= this.ins.length) {

throw new Error("Input index '"+inIndex+"' invalid or out of bounds "+

"("+this.ins.length+" inputs)");

}

// Clone transaction

var txTmp = new Transaction();

this.ins.forEach(function (txin, i) {

txTmp.ins.push(new TransactionIn(txin));

});

this.outs.forEach(function (txout) {

txTmp.outs.push(new TransactionOut(txout));

});

txTmp.version = this.version;

txTmp.lock_time = this.lock_time;

// In case concatenating two scripts ends up with two codeseparators,

// or an extra one at the end, this prevents all those possible

// incompatibilities.

script.findAndDelete(OP_CODESEPARATOR);

// Get mode portion of hashtype

var hashTypeMode = hashType & 0x1f;

// Generate modified transaction data for hash

var bytes = (new Put());

bytes.word32le(this.version);

// Serialize inputs

if (hashType & SIGHASH_ANYONECANPAY) {

// Blank out all inputs except current one, not recommended for open

// transactions.

bytes.varint(1);

bytes.put(this.ins[inIndex].o);

bytes.varint(script.buffer.length);

bytes.put(script.buffer);

bytes.word32le(this.ins[inIndex].q);

} else {

bytes.varint(this.ins.length);

for (var i = 0, l = this.ins.length; i < l; i++) {

var txin = this.ins[i];

bytes.put(this.ins[i].o);

// Current input's script gets set to the script to be signed, all others

// get blanked.

if (inIndex === i) {

bytes.varint(script.buffer.length);

bytes.put(script.buffer);

} else {

bytes.varint(0);

}

if (hashTypeMode === SIGHASH_NONE && inIndex !== i) {

bytes.word32le(0);

} else {

bytes.word32le(this.ins[i].q);

}

// Serialize outputs

if (hashTypeMode === SIGHASH_NONE) {

bytes.varint(0);

} else {

var outsLen;

if (hashTypeMode === SIGHASH_SINGLE) {

// TODO: Untested

if (inIndex >= txTmp.outs.length) {

throw new Error("Transaction.hashForSignature(): SIGHASH_SINGLE " +

"no corresponding txout found - out of bounds");

}

outsLen = inIndex + 1;

} else {

outsLen = this.outs.length;

}

// TODO: If hashTypeMode !== SIGHASH_SINGLE, we could memcpy this whole

// section from the original transaction as is.

bytes.varint(outsLen);

for (var i = 0; i < outsLen; i++) {

if (hashTypeMode === SIGHASH_SINGLE && i !== inIndex) {

// Zero all outs except the one we want to keep

bytes.put(util.INT64_MAX);

bytes.varint(0);

} else {

bytes.put(this.outs[i].v);

bytes.varint(this.outs[i].s.length);

bytes.put(this.outs[i].s);

}

bytes.word32le(this.lock_time);

var buffer = bytes.buffer();

// Append hashType

buffer = buffer.concat(new Buffer([parseInt(hashType), 0, 0, 0]));

return util.twoSha256(buffer);

};

/**

* Returns an object with the same field names as jgarzik's getblock patch.

Transaction.prototype.getStandardizedObject = function getStandardizedObject() {

var tx = {

hash: util.formatHashFull(this.getHash()),

version: this.version,

lock_time: this.lock_time

};

var totalSize = 8; // version + lock_time

totalSize += util.getVarIntSize(this.ins.length); // tx_in count

var ins = this.ins.map(function (txin) {

var txinObj = {

prev_out: {

hash: new Buffer(txin.getOutpointHash()).reverse().toString(hex),

n: txin.getOutpointIndex()

}

};

if (txin.isCoinBase()) {

txinObj.coinbase = txin.s.toString('hex');

} else {

txinObj.scriptSig = new Script(txin.s).getStringContent(false, 0);

}

totalSize += 36 + util.getVarIntSize(txin.s.length) +

txin.s.length + 4; // outpoint + script_len + script + sequence

return txinObj;

});

totalSize += util.getVarIntSize(this.outs.length);

var outs = this.outs.map(function (txout) {

totalSize += util.getVarIntSize(txout.s.length) +

txout.s.length + 8; // script_len + script + value

return {

value: util.formatValue(txout.v),

scriptPubKey: new Script(txout.s).getStringContent(false, 0)

};

});

tx.size = totalSize;

tx["in"] = ins;

tx["out"] = outs;

return tx;

};

// Add some Mongoose compatibility functions to the plain object

Transaction.prototype.toObject = function toObject() {

return this;

};

Transaction.prototype.parse = function (parser) {

if (Buffer.isBuffer(parser)) {

parser = new Parser(parser);

}

var i, sLen, startPos = parser.pos;

this.version = parser.word32le();

var txinCount = parser.varInt();

this.ins = [];

for (j = 0; j < txinCount; j++) {

var txin = new TransactionIn();

txin.o = parser.buffer(36); // outpoint

sLen = parser.varInt(); // script_len

txin.s = parser.buffer(sLen); // script

txin.q = parser.word32le(); // sequence

this.ins.push(txin);

}

var txoutCount = parser.varInt();

this.outs = [];

for (j = 0; j < txoutCount; j++) {

var txout = new TransactionOut();

txout.v = parser.buffer(8); // value

sLen = parser.varInt(); // script_len

txout.s = parser.buffer(sLen); // script

this.outs.push(txout);

}

this.lock_time = parser.word32le();

};

var TransactionInputsCache = exports.TransactionInputsCache =

function TransactionInputsCache(tx)

{

var txList = [];

var txList64 = [];

var reqOuts = {};

// Get list of transactions required for verification

tx.ins.forEach(function (txin) {

if (txin.isCoinBase()) return;

var hash = txin.o.slice(0, 32);

var hash64 = hash.toString('base64');

if (txList64.indexOf(hash64) == -1) {

txList.push(hash);

txList64.push(hash64);

}

if (!reqOuts[hash64]) {

reqOuts[hash64] = [];

}

reqOuts[hash64][txin.getOutpointIndex()] = true;

});

this.tx = tx;

this.txList = txList;

this.txList64 = txList64;

this.txIndex = {};

this.requiredOuts = reqOuts;

this.callbacks = [];

};

TransactionInputsCache.prototype.buffer = function buffer(blockChain, txStore, wait, callback)

{

var self = this;

var complete = false;

if ("function" === typeof callback) {

self.callbacks.push(callback);

}

var missingTx = {};

self.txList64.forEach(function (hash64) {

missingTx[hash64] = true;

});

// A utility function to create the index object from the txs result lists

function indexTxs(err, txs) {

if (err) throw err;

// Index memory transactions

txs.forEach(function (tx) {

var hash64 = tx.getHash().toString('base64');

var obj = {};

Object.keys(self.requiredOuts[hash64]).forEach(function (o) {

obj[+o] = tx.outs[+o];

});

self.txIndex[hash64] = obj;

delete missingTx[hash64];

});

this(null);

};

Step(

// First find and index memory transactions (if a txStore was provided)

function findMemTx() {

if (txStore) {

txStore.find(self.txList64, this);

} else {

this(null, []);

}

indexTxs,

// Second find and index persistent transactions

function findBlockChainTx(err) {

if (err) throw err;

// TODO: Major speedup should be possible if we load only the outs and not

// whole transactions.

var callback = this;

blockChain.getOutputsByHashes(self.txList, function (err, result) {

callback(err, result);

});

indexTxs,

function saveTxCache(err) {

if (err) throw err;

var missingTxDbg = '';

if (Object.keys(missingTx).length) {

missingTxDbg = Object.keys(missingTx).map(function (hash64) {

return util.formatHash(new Buffer(hash64, 'base64'));

}).join(',');

}

if (wait && Object.keys(missingTx).length) {

// TODO: This might no longer be needed now that saveTransactions uses

// the safe=true option.

setTimeout(function () {

var missingHashes = Object.keys(missingTx);

if (missingHashes.length) {

self.callback(new Error('Missing inputs (timeout while searching): '

+ missingTxDbg));

} else if (!complete) {

self.callback(new Error('Callback failed to trigger'));

}

}, 10000);

} else {

complete = true;

this(null, self);

}

self.callback.bind(self)

);

};

TransactionInputsCache.prototype.callback = function callback(err)

{

var args = Array.prototype.slice.apply(arguments);

// Empty the callback array first (because downstream functions could add new

// callbacks or otherwise interfere if were not in a consistent state.)

var cbs = this.callbacks;

this.callbacks = [];

try {

cbs.forEach(function (cb) {

cb.apply(null, args);

});

} catch (err) {

log.err("Callback error after connecting tx inputs: "+

(err.stack ? err.stack : err.toString()));

}

};

return Transaction;

};

module.defineClass(spec);

node-libcoin/Transaction.js at master · UnsupportedCallbackException/node-libcoin · GitHub

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