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wallet: better tx input selection

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We try to avoid related inputs, when possible
This commit is contained in:
moneromooo-monero 2016-07-12 22:00:43 +01:00
parent 1e21651f24
commit 84c82cd775
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GPG key ID: 686F07454D6CEFC3
2 changed files with 77 additions and 29 deletions
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103
src/wallet/wallet2.cpp
View file

@ -2097,6 +2097,7 @@ namespace
T pop_index(std::vector<T>& vec, size_t idx)
{
CHECK_AND_ASSERT_MES(!vec.empty(), T(), "Vector must be non-empty");
CHECK_AND_ASSERT_MES(idx < vec.size(), T(), "idx out of bounds");
T res = vec[idx];
if (idx + 1 != vec.size())
@ -2128,6 +2129,76 @@ namespace
}
}
//----------------------------------------------------------------------------------------------------
// This returns a handwavy estimation of how much two outputs are related
// If they're from the same tx, then they're fully related. From close block
// heights, they're kinda related. The actual values don't matter, just
// their ordering, but it could become more murky if we add scores later.
float wallet2::get_output_relatedness(const transfer_details &td0, const transfer_details &td1) const
{
int dh;
#if 0
// expensive test, and same tx will fall onto the same block height below
if (get_transaction_hash(td0.m_tx) == get_transaction_hash(td1.m_tx))
return 1.0f;
#endif
// same block height -> possibly tx burst, or same tx (since above is disabled)
dh = td0.m_block_height > td1.m_block_height ? td0.m_block_height - td1.m_block_height : td1.m_block_height - td0.m_block_height;
if (dh == 0)
return 0.9f;
// adjacent blocks -> possibly tx burst
if (dh == 1)
return 0.8f;
// could extract the payment id, and compare them, but this is a bit expensive too
// similar block heights
if (dh < 10)
return 0.2f;
// don't think these are particularly related
return 0.0f;
}
//----------------------------------------------------------------------------------------------------
size_t wallet2::pop_best_value_from(const transfer_container &transfers, std::vector<size_t> &unused_indices, const std::list<transfer_container::iterator>& selected_transfers) const
{
std::vector<size_t> candidates;
float best_relatedness = 1.0f;
for (size_t n = 0; n < unused_indices.size(); ++n)
{
const transfer_details &candidate = transfers[unused_indices[n]];
float relatedness = 0.0f;
for (const auto &i: selected_transfers)
{
float r = get_output_relatedness(candidate, *i);
if (r > relatedness)
{
relatedness = r;
if (relatedness == 1.0f)
break;
}
}
if (relatedness < best_relatedness)
{
best_relatedness = relatedness;
candidates.clear();
}
if (relatedness == best_relatedness)
candidates.push_back(n);
}
size_t idx = crypto::rand<size_t>() % candidates.size();
return pop_index (unused_indices, candidates[idx]);
}
//----------------------------------------------------------------------------------------------------
size_t wallet2::pop_best_value(std::vector<size_t> &unused_indices, const std::list<transfer_container::iterator>& selected_transfers) const
{
return pop_best_value_from(m_transfers, unused_indices, selected_transfers);
}
//----------------------------------------------------------------------------------------------------
// Select random input sources for transaction.
// returns:
// direct return: amount of money found
@ -2137,7 +2208,7 @@ uint64_t wallet2::select_transfers(uint64_t needed_money, std::vector<size_t> un
uint64_t found_money = 0;
while (found_money < needed_money && !unused_transfers_indices.empty())
{
size_t idx = pop_random_value(unused_transfers_indices);
size_t idx = pop_best_value(unused_transfers_indices, selected_transfers);
transfer_container::iterator it = m_transfers.begin() + idx;
selected_transfers.push_back(it);
@ -3053,32 +3124,6 @@ static size_t estimate_rct_tx_size(int n_inputs, int mixin, int n_outputs)
return size;
}
// This returns a handwavy estimation of how much two outputs are related
// If they're from the same tx, then they're fully related. From close block
// heights, they're kinda related. The actual values don't matter, just
// their ordering, but it could become more murky if we add scores later.
float wallet2::get_output_relatedness(const transfer_details &td0, const transfer_details &td1) const
{
#if 0
// expensive test, and same tx will fall onto the same block height below
if (get_transaction_hash(td0.m_tx) == get_transaction_hash(td1.m_tx))
return 1.0f;
#endif
// same block height -> possibly tx burst, or same tx (since above is disabled)
if (td0.m_block_height == td1.m_block_height)
return 0.9f;
// could extract the payment id, and compare them, but this is a bit expensive too
// similar block heights
if ((td0.m_block_height > td1.m_block_height ? td0.m_block_height - td1.m_block_height : td1.m_block_height - td0.m_block_height) < 10)
return 0.2f;
// don't think these are particularly related
return 0.0f;
}
std::vector<size_t> wallet2::pick_prefered_rct_inputs(uint64_t needed_money) const
{
std::vector<size_t> picks;
@ -3255,7 +3300,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
// get a random unspent output and use it to pay part (or all) of the current destination (and maybe next one, etc)
// This could be more clever, but maybe at the cost of making probabilistic inferences easier
size_t idx = !prefered_inputs.empty() ? pop_back(prefered_inputs) : !unused_transfers_indices.empty() ? pop_random_value(unused_transfers_indices) : pop_random_value(unused_dust_indices);
size_t idx = !prefered_inputs.empty() ? pop_back(prefered_inputs) : !unused_transfers_indices.empty() ? pop_best_value(unused_transfers_indices, tx.selected_transfers) : pop_best_value(unused_dust_indices, tx.selected_transfers);
const transfer_details &td = m_transfers[idx];
LOG_PRINT_L2("Picking output " << idx << ", amount " << print_money(td.amount()));
@ -3459,7 +3504,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_all(const cryptono
// get a random unspent output and use it to pay next chunk. We try to alternate
// dust and non dust to ensure we never get with only dust, from which we might
// get a tx that can't pay for itself
size_t idx = unused_transfers_indices.empty() ? pop_random_value(unused_dust_indices) : unused_dust_indices.empty() ? pop_random_value(unused_transfers_indices) : ((tx.selected_transfers.size() & 1) || accumulated_outputs > FEE_PER_KB * fee_multiplier * (upper_transaction_size_limit + 1023) / 1024) ? pop_random_value(unused_dust_indices) : pop_random_value(unused_transfers_indices);
size_t idx = unused_transfers_indices.empty() ? pop_best_value(unused_dust_indices, tx.selected_transfers) : unused_dust_indices.empty() ? pop_best_value(unused_transfers_indices, tx.selected_transfers) : ((tx.selected_transfers.size() & 1) || accumulated_outputs > FEE_PER_KB * fee_multiplier * (upper_transaction_size_limit + 1023) / 1024) ? pop_best_value(unused_dust_indices, tx.selected_transfers) : pop_best_value(unused_transfers_indices, tx.selected_transfers);
const transfer_details &td = m_transfers[idx];
LOG_PRINT_L2("Picking output " << idx << ", amount " << print_money(td.amount()));

3
src/wallet/wallet2.h
View file

@ -404,6 +404,9 @@ namespace tools
std::vector<size_t> select_available_unmixable_outputs(bool trusted_daemon);
std::vector<size_t> select_available_mixable_outputs(bool trusted_daemon);
size_t pop_best_value_from(const transfer_container &transfers, std::vector<size_t> &unused_dust_indices, const std::list<transfer_container::iterator>& selected_transfers) const;
size_t pop_best_value(std::vector<size_t> &unused_dust_indices, const std::list<transfer_container::iterator>& selected_transfers) const;
void set_tx_note(const crypto::hash &txid, const std::string &note);
std::string get_tx_note(const crypto::hash &txid) const;