Merge pull request #484 from isocolsky/fix/utxo-selection
Add threshold for change creation when selecting UTXOs
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commit
68ec16d35a
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@ -63,4 +63,7 @@ Defaults.UTXO_SELECTION_MAX_FEE_VS_TX_AMOUNT_FACTOR = 0.05;
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// when fees are significant (proportional to how much we would pay for using that big input only).
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Defaults.UTXO_SELECTION_MAX_FEE_VS_SINGLE_UTXO_FEE_FACTOR = 5;
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// Do not generate change for less than the specified amount
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Defaults.UTXO_SELECTION_MIN_CHANGE_AMOUNT = 5000;
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module.exports = Defaults;
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@ -1480,8 +1480,9 @@ WalletService.prototype._selectTxInputs = function(txp, utxosToExclude, cb) {
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var changeAmount = Math.round(total - txpAmount - fee);
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log.debug('Tx change: ', Utils.formatAmountInBtc(changeAmount));
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if (changeAmount > 0 && changeAmount <= Bitcore.Transaction.DUST_AMOUNT) {
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log.debug('Change below dust amount (' + Utils.formatAmountInBtc(Bitcore.Transaction.DUST_AMOUNT) + ')');
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var smallChangeThreshold = Math.max(Defaults.UTXO_SELECTION_MIN_CHANGE_AMOUNT, Bitcore.Transaction.DUST_AMOUNT);
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if (changeAmount > 0 && changeAmount <= smallChangeThreshold) {
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log.debug('Change below threshold (' + Utils.formatAmountInBtc(smallChangeThreshold) + '). Incrementing fee to remove change.');
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// Remove dust change by incrementing fee
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fee += changeAmount;
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}
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@ -2326,18 +2326,18 @@ describe('Wallet service', function() {
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it('should be possible to use a smaller fee', function(done) {
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helpers.stubUtxos(server, wallet, 1, function() {
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var txOpts = helpers.createSimpleProposalOpts('18PzpUFkFZE8zKWUPvfykkTxmB9oMR8qP7', 0.99995, TestData.copayers[0].privKey_1H_0, {
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var txOpts = helpers.createSimpleProposalOpts('18PzpUFkFZE8zKWUPvfykkTxmB9oMR8qP7', 0.9999, TestData.copayers[0].privKey_1H_0, {
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feePerKb: 80000
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});
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server.createTxLegacy(txOpts, function(err, tx) {
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should.exist(err);
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err.code.should.equal('INSUFFICIENT_FUNDS_FOR_FEE');
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var txOpts = helpers.createSimpleProposalOpts('18PzpUFkFZE8zKWUPvfykkTxmB9oMR8qP7', 0.99995, TestData.copayers[0].privKey_1H_0, {
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var txOpts = helpers.createSimpleProposalOpts('18PzpUFkFZE8zKWUPvfykkTxmB9oMR8qP7', 0.9999, TestData.copayers[0].privKey_1H_0, {
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feePerKb: 5000
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});
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server.createTxLegacy(txOpts, function(err, tx) {
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should.not.exist(err);
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var estimatedFee = 5000 * 400 / 1000; // fully signed tx should have about 400 bytes
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var estimatedFee = 5000 * 410 / 1000; // fully signed tx should have about 410 bytes
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tx.fee.should.be.within(0.9 * estimatedFee, 1.1 * estimatedFee);
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// Sign it to make sure Bitcore doesn't complain about the fees
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@ -3597,17 +3597,18 @@ describe('Wallet service', function() {
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});
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});
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});
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it('should correct fee if resulting change would be below dust', function(done) {
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it('should correct fee if resulting change would be below threshold', function(done) {
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helpers.stubUtxos(server, wallet, ['200bit', '500sat'], function() {
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var txOpts = {
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outputs: [{
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toAddress: '18PzpUFkFZE8zKWUPvfykkTxmB9oMR8qP7',
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amount: 200e2,
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amount: 150e2,
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}],
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feePerKb: 400,
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feePerKb: 100e2,
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};
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server.createTx(txOpts, function(err, txp) {
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should.not.exist(err);
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txp.inputs.length.should.equal(1);
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(_.sum(txp.inputs, 'satoshis') - txp.outputs[0].amount - txp.fee).should.equal(0);
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var changeOutput = txp.getBitcoreTx().getChangeOutput();
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should.not.exist(changeOutput);
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