Merge pull request #1271 from isocolsky/fix/fee_estimation
Fix/fee estimation
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commit
a4ac3f50d3
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@ -205,7 +205,7 @@ Transaction.prototype.getSerializationError = function(opts) {
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unspentError = this._hasFeeError(opts, unspent);
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}
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return unspentError ||
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return unspentError ||
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this._hasDustOutputs(opts) ||
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this._isMissingSignatures(opts);
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};
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@ -394,7 +394,7 @@ Transaction.prototype._checkConsistency = function() {
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$.checkState(this._changeScript);
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$.checkState(this.outputs[this._changeIndex]);
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$.checkState(this.outputs[this._changeIndex].script.toString() ===
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this._changeScript.toString());
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this._changeScript.toString());
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}
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// TODO: add other checks
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};
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@ -634,6 +634,21 @@ Transaction.prototype.fee = function(amount) {
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return this;
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};
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/**
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* Manually set the fee per KB for this transaction. Beware that this resets all the signatures
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* for inputs (in further versions, SIGHASH_SINGLE or SIGHASH_NONE signatures will not
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* be reset).
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*
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* @param {number} amount satoshis per KB to be sent
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* @return {Transaction} this, for chaining
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*/
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Transaction.prototype.feePerKb = function(amount) {
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$.checkArgument(_.isNumber(amount), 'amount must be a number');
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this._feePerKb = amount;
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this._updateChangeOutput();
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return this;
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};
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/* Output management */
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/**
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@ -831,7 +846,7 @@ Transaction.prototype.getFee = function() {
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Transaction.prototype._estimateFee = function() {
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var estimatedSize = this._estimateSize();
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var available = this._getUnspentValue();
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return Transaction._estimateFee(estimatedSize, available);
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return Transaction._estimateFee(estimatedSize, available, this._feePerKb);
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};
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Transaction.prototype._getUnspentValue = function() {
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@ -844,12 +859,12 @@ Transaction.prototype._clearSignatures = function() {
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});
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};
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Transaction._estimateFee = function(size, amountAvailable) {
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var fee = Math.ceil(size / Transaction.FEE_PER_KB);
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Transaction._estimateFee = function(size, amountAvailable, feePerKb) {
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var fee = Math.ceil(size / 1000) * (feePerKb || Transaction.FEE_PER_KB);
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if (amountAvailable > fee) {
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size += Transaction.CHANGE_OUTPUT_MAX_SIZE;
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}
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return Math.ceil(size / 1000) * Transaction.FEE_PER_KB;
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return Math.ceil(size / 1000) * (feePerKb || Transaction.FEE_PER_KB);
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};
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Transaction.prototype._estimateSize = function() {
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@ -257,6 +257,22 @@ describe('Transaction', function() {
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transaction.outputs.length.should.equal(2);
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transaction.outputs[1].satoshis.should.equal(10000);
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});
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it('fee per kb can be set up manually', function() {
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var inputs = _.map(_.range(10), function(i) {
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var utxo = _.clone(simpleUtxoWith100000Satoshis);
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utxo.outputIndex = i;
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return utxo;
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});
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var transaction = new Transaction()
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.from(inputs)
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.to(toAddress, 950000)
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.feePerKb(8000)
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.change(changeAddress)
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.sign(privateKey);
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transaction._estimateSize().should.be.within(1000, 1999);
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transaction.outputs.length.should.equal(2);
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transaction.outputs[1].satoshis.should.equal(34000);
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});
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it('if satoshis are invalid', function() {
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var transaction = new Transaction()
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.from(simpleUtxoWith100000Satoshis)
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@ -406,7 +422,9 @@ describe('Transaction', function() {
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.fee(10000000);
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expect(function() {
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return transaction.serialize({disableMoreOutputThanInput: true});
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return transaction.serialize({
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disableMoreOutputThanInput: true
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});
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}).to.throw(errors.Transaction.FeeError.TooLarge);
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});
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describe('skipping checks', function() {
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