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wallet: select part of the fake outs from recent outputs

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25% of the outputs are selected from the last 5 days (if possible),
in order to avoid the common case of sending recently received
outputs again. 25% and 5 days are subject to review later, since
it's just a wallet level change.
This commit is contained in:
moneromooo-monero 2016-09-17 15:45:51 +01:00
parent 34fcfcd7cc
commit 88faec75fe
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GPG key ID: 686F07454D6CEFC3
9 changed files with 92 additions and 32 deletions
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36
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -2657,7 +2657,7 @@ void BlockchainLMDB::get_output_tx_and_index(const uint64_t& amount, const std::
LOG_PRINT_L3("db3: " << db3);
}
std::map<uint64_t, uint64_t> BlockchainLMDB::get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked) const
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> BlockchainLMDB::get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff) const
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open();
@ -2665,7 +2665,7 @@ std::map<uint64_t, uint64_t> BlockchainLMDB::get_output_histogram(const std::vec
TXN_PREFIX_RDONLY();
RCURSOR(output_amounts);
std::map<uint64_t, uint64_t> histogram;
std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> histogram;
MDB_val k;
MDB_val v;
@ -2683,7 +2683,7 @@ std::map<uint64_t, uint64_t> BlockchainLMDB::get_output_histogram(const std::vec
mdb_size_t num_elems = 0;
mdb_cursor_count(m_cur_output_amounts, &num_elems);
uint64_t amount = *(const uint64_t*)k.mv_data;
histogram[amount] = num_elems;
histogram[amount] = std::make_tuple(num_elems, 0, 0);
}
}
else
@ -2694,13 +2694,13 @@ std::map<uint64_t, uint64_t> BlockchainLMDB::get_output_histogram(const std::vec
int ret = mdb_cursor_get(m_cur_output_amounts, &k, &v, MDB_SET);
if (ret == MDB_NOTFOUND)
{
histogram[amount] = 0;
histogram[amount] = std::make_tuple(0, 0, 0);
}
else if (ret == MDB_SUCCESS)
{
mdb_size_t num_elems = 0;
mdb_cursor_count(m_cur_output_amounts, &num_elems);
histogram[amount] = num_elems;
histogram[amount] = std::make_tuple(num_elems, 0, 0);
}
else
{
@ -2709,11 +2709,11 @@ std::map<uint64_t, uint64_t> BlockchainLMDB::get_output_histogram(const std::vec
}
}
if (unlocked) {
if (unlocked || recent_cutoff > 0) {
const uint64_t blockchain_height = height();
for (auto i: histogram) {
uint64_t amount = i.first;
uint64_t num_elems = i.second;
for (std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>>::iterator i = histogram.begin(); i != histogram.end(); ++i) {
uint64_t amount = i->first;
uint64_t num_elems = std::get<0>(i->second);
while (num_elems > 0) {
const tx_out_index toi = get_output_tx_and_index(amount, num_elems - 1);
const uint64_t height = get_tx_block_height(toi.first);
@ -2722,7 +2722,23 @@ std::map<uint64_t, uint64_t> BlockchainLMDB::get_output_histogram(const std::vec
--num_elems;
}
// modifying second does not invalidate the iterator
i.second = num_elems;
std::get<1>(i->second) = num_elems;
if (recent_cutoff > 0)
{
uint64_t recent = 0;
while (num_elems > 0) {
const tx_out_index toi = get_output_tx_and_index(amount, num_elems - 1);
const uint64_t height = get_tx_block_height(toi.first);
const uint64_t ts = get_block_timestamp(height);
if (ts < recent_cutoff)
break;
--num_elems;
++recent;
}
// modifying second does not invalidate the iterator
std::get<2>(i->second) = recent;
}
}
}