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wallet2: fix sending a rct tx with a single output available

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This would have tried to send a second output to make the tx
look like the 2/2 ideal, but it would not fail to find one
because picking an output from preferred_inputs priority list
did not remove it from the unused tranfer/dust outputs, so
it would try to send the same output twice.

While there, I also added a check to avoid sending a second
input if it's related to the first. Better 1/2 than linking
inputs, I think.
This commit is contained in:
moneromooo-monero 2017-01-22 15:12:13 +00:00
parent 71ac698b78
commit 20f7152769
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 50 additions and 3 deletions
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53
src/wallet/wallet2.cpp
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@ -87,6 +87,8 @@ using namespace cryptonote;
#define FEE_ESTIMATE_GRACE_BLOCKS 10 // estimate fee valid for that many blocks
#define SECOND_OUTPUT_RELATEDNESS_THRESHOLD 0.0f
#define KILL_IOSERVICE() \
do { \
work.reset(); \
@ -2720,6 +2722,19 @@ namespace
vec.pop_back();
return res;
}
template<typename T>
void pop_if_present(std::vector<T>& vec, T e)
{
for (size_t i = 0; i < vec.size(); ++i)
{
if (e == vec[i])
{
pop_index (vec, i);
return;
}
}
}
}
//----------------------------------------------------------------------------------------------------
// This returns a handwavy estimation of how much two outputs are related
@ -4028,6 +4043,17 @@ std::vector<size_t> wallet2::pick_preferred_rct_inputs(uint64_t needed_money) co
return picks;
}
static bool should_pick_a_second_output(bool use_rct, size_t n_transfers, const std::vector<size_t> &unused_transfers_indices, const std::vector<size_t> &unused_dust_indices)
{
if (!use_rct)
return false;
if (n_transfers > 1)
return false;
if (unused_dust_indices.empty() && unused_transfers_indices.empty())
return false;
return true;
}
// Another implementation of transaction creation that is hopefully better
// While there is anything left to pay, it goes through random outputs and tries
// to fill the next destination/amount. If it fully fills it, it will use the
@ -4152,9 +4178,19 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
// - we have something to send
// - or we need to gather more fee
// - or we have just one input in that tx, which is rct (to try and make all/most rct txes 2/2)
while ((!dsts.empty() && dsts[0].amount > 0) || adding_fee || (use_rct && txes.back().selected_transfers.size() == 1)) {
while ((!dsts.empty() && dsts[0].amount > 0) || adding_fee || should_pick_a_second_output(use_rct, txes.back().selected_transfers.size(), unused_transfers_indices, unused_dust_indices)) {
TX &tx = txes.back();
LOG_PRINT_L2("Start of loop with " << unused_transfers_indices.size() << " " << unused_dust_indices.size());
LOG_PRINT_L2("unused_transfers_indices:");
for (auto t: unused_transfers_indices)
LOG_PRINT_L2(" " << t);
LOG_PRINT_L2("unused_dust_indices:");
for (auto t: unused_dust_indices)
LOG_PRINT_L2(" " << t);
LOG_PRINT_L2("dsts size " << dsts.size() << ", first " << (dsts.empty() ? -1 : dsts[0].amount));
LOG_PRINT_L2("adding_fee " << adding_fee << ", use_rct " << use_rct);
// if we need to spend money and don't have any left, we fail
if (unused_dust_indices.empty() && unused_transfers_indices.empty()) {
LOG_PRINT_L2("No more outputs to choose from");
@ -4167,9 +4203,20 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
if ((dsts.empty() || dsts[0].amount == 0) && !adding_fee)
// the "make rct txes 2/2" case - we pick a small value output to "clean up" the wallet too
idx = pop_best_value(unused_dust_indices.empty() ? unused_transfers_indices : unused_dust_indices, tx.selected_transfers, true);
else if (!prefered_inputs.empty())
else if (!prefered_inputs.empty()) {
idx = pop_back(prefered_inputs);
else
pop_if_present(unused_transfers_indices, idx);
pop_if_present(unused_dust_indices, idx);
// since we're trying to add a second output which is not strictly needed,
// we only add it if it's unrelated enough to the first one
float relatedness = get_output_relatedness(m_transfers[idx], m_transfers[tx.selected_transfers.front()]);
if (relatedness > SECOND_OUTPUT_RELATEDNESS_THRESHOLD)
{
LOG_PRINT_L2("Second outout was not strictly needed, and relatedness " << relatedness << ", not adding");
break;
}
} else
idx = pop_best_value(unused_transfers_indices.empty() ? unused_dust_indices : unused_transfers_indices, tx.selected_transfers);
const transfer_details &td = m_transfers[idx];