Auto merge of #1862 - bitcartel:1854_z_sendmany_transparent_change, r=bitcartel
Closes #1854. z_sendmany selects more utxos to avoid dust change output.
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343b0d6723
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@ -127,6 +127,15 @@ class WalletProtectCoinbaseTest (BitcoinTestFramework):
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assert_equal(Decimal(resp["private"]), Decimal('9.9998'))
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assert_equal(Decimal(resp["total"]), Decimal('39.9998'))
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# z_sendmany will return an error if there is transparent change output considered dust.
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# UTXO selection in z_sendmany sorts in ascending order, so smallest utxos are consumed first.
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# At this point in time, unspent notes all have a value of 10.0 and standard z_sendmany fee is 0.0001.
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recipients = []
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amount = Decimal('10.0') - Decimal('0.00010000') - Decimal('0.00000001') # this leaves change at 1 zatoshi less than dust threshold
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recipients.append({"address":self.nodes[0].getnewaddress(), "amount":amount })
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myopid = self.nodes[0].z_sendmany(mytaddr, recipients)
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self.wait_and_assert_operationid_status(myopid, "failed", "Insufficient transparent funds, have 10.00, need 0.00000545 more to avoid creating invalid change output 0.00000001 (dust threshold is 0.00000546)")
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# Send will fail because send amount is too big, even when including coinbase utxos
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errorString = ""
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try:
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@ -215,6 +215,14 @@ bool AsyncRPCOperation_sendmany::main_impl() {
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CAmount selectedUTXOAmount = 0;
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bool selectedUTXOCoinbase = false;
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if (isfromtaddr_) {
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// Get dust threshold
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CKey secret;
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secret.MakeNewKey(true);
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CScript scriptPubKey = GetScriptForDestination(secret.GetPubKey().GetID());
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CTxOut out(CAmount(1), scriptPubKey);
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CAmount dustThreshold = out.GetDustThreshold(minRelayTxFee);
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CAmount dustChange = -1;
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std::vector<SendManyInputUTXO> selectedTInputs;
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for (SendManyInputUTXO & t : t_inputs_) {
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bool b = std::get<3>(t);
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@ -224,9 +232,21 @@ bool AsyncRPCOperation_sendmany::main_impl() {
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selectedUTXOAmount += std::get<2>(t);
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selectedTInputs.push_back(t);
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if (selectedUTXOAmount >= targetAmount) {
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break;
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// Select another utxo if there is change less than the dust threshold.
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dustChange = selectedUTXOAmount - targetAmount;
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if (dustChange == 0 || dustChange >= dustThreshold) {
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break;
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}
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}
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}
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// If there is transparent change, is it valid or is it dust?
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if (dustChange < dustThreshold && dustChange != 0) {
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throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS,
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strprintf("Insufficient transparent funds, have %s, need %s more to avoid creating invalid change output %s (dust threshold is %s)",
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FormatMoney(t_inputs_total), FormatMoney(dustThreshold - dustChange), FormatMoney(dustChange), FormatMoney(dustThreshold)));
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}
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t_inputs_ = selectedTInputs;
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t_inputs_total = selectedUTXOAmount;
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@ -772,6 +792,11 @@ bool AsyncRPCOperation_sendmany::find_utxos(bool fAcceptCoinbase=false) {
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t_inputs_.push_back(utxo);
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}
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// sort in ascending order, so smaller utxos appear first
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std::sort(t_inputs_.begin(), t_inputs_.end(), [](SendManyInputUTXO i, SendManyInputUTXO j) -> bool {
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return ( std::get<2>(i) < std::get<2>(j));
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});
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return t_inputs_.size() > 0;
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}
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