1 files changed, 91 insertions, 13 deletions

diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index aa638143c..7d308e615 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -2508,7 +2508,7 @@ uint64_t wallet2::unlocked_dust_balance(const tx_dust_policy &dust_policy) const
 }
 
 template<typename T>
-void wallet2::transfer_dust(size_t num_outputs, uint64_t unlock_time, uint64_t needed_fee, T destination_split_strategy, const tx_dust_policy& dust_policy, const std::vector<uint8_t> &extra, cryptonote::transaction& tx, pending_tx &ptx)
+void wallet2::transfer_from(const std::vector<size_t> &outs, size_t num_outputs, uint64_t unlock_time, uint64_t needed_fee, T destination_split_strategy, const tx_dust_policy& dust_policy, const std::vector<uint8_t> &extra, cryptonote::transaction& tx, pending_tx &ptx)
 {
   using namespace cryptonote;
 
@@ -2518,6 +2518,19 @@ void wallet2::transfer_dust(size_t num_outputs, uint64_t unlock_time, uint64_t n
   // throw if there are none
   uint64_t money = 0;
   std::list<transfer_container::iterator> selected_transfers;
+#if 1
+  for (size_t n = 0; n < outs.size(); ++n)
+  {
+    const transfer_details& td = m_transfers[outs[n]];
+    if (!td.m_spent)
+    {
+      selected_transfers.push_back (m_transfers.begin() + outs[n]);
+      money += td.amount();
+      if (selected_transfers.size() >= num_outputs)
+        break;
+    }
+  }
+#else
   for (transfer_container::iterator i = m_transfers.begin(); i != m_transfers.end(); ++i)
   {
     const transfer_details& td = *i;
@@ -2529,6 +2542,7 @@ void wallet2::transfer_dust(size_t num_outputs, uint64_t unlock_time, uint64_t n
         break;
     }
   }
+#endif
 
   // we don't allow no output to self, easier, but one may want to burn the dust if = fee
   THROW_WALLET_EXCEPTION_IF(money <= needed_fee, error::not_enough_money, money, needed_fee, needed_fee);
@@ -2622,8 +2636,8 @@ bool wallet2::use_fork_rules(uint8_t version)
   r = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/json_rpc", req_t, resp_t, m_http_client);
   m_daemon_rpc_mutex.unlock();
   CHECK_AND_ASSERT_MES(r, false, "Failed to connect to daemon");
-  CHECK_AND_ASSERT_MES(res.status != CORE_RPC_STATUS_BUSY, false, "Failed to connect to daemon");
-  CHECK_AND_ASSERT_MES(res.status == CORE_RPC_STATUS_OK, false, "Failed to get hard fork status");
+  CHECK_AND_ASSERT_MES(resp_t.result.status != CORE_RPC_STATUS_BUSY, false, "Failed to connect to daemon");
+  CHECK_AND_ASSERT_MES(resp_t.result.status == CORE_RPC_STATUS_OK, false, "Failed to get hard fork status");
 
   bool close_enough = res.height >=  resp_t.result.earliest_height - 10; // start using the rules a bit beforehand
   if (close_enough)
@@ -2641,20 +2655,84 @@ uint64_t wallet2::get_upper_tranaction_size_limit()
   return ((full_reward_zone * 125) / 100) - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE;
 }
 //----------------------------------------------------------------------------------------------------
-std::vector<wallet2::pending_tx> wallet2::create_dust_sweep_transactions()
+std::vector<size_t> wallet2::select_available_outputs(std::function<bool(const transfer_details &td)> f)
+{
+  std::vector<size_t> outputs;
+  size_t n = 0;
+  for (transfer_container::const_iterator i = m_transfers.begin(); i != m_transfers.end(); ++i, ++n)
+  {
+    if (i->m_spent)
+      continue;
+    if (!is_transfer_unlocked(*i))
+      continue;
+    if (f(*i))
+      outputs.push_back(n);
+  }
+  return outputs;
+}
+//----------------------------------------------------------------------------------------------------
+std::vector<uint64_t> wallet2::get_unspent_amounts_vector()
+{
+  std::set<uint64_t> set;
+  for (const auto &td: m_transfers)
+  {
+    if (!td.m_spent)
+      set.insert(td.amount());
+  }
+  std::vector<uint64_t> vector;
+  vector.reserve(set.size());
+  for (const auto &i: set)
+  {
+    vector.push_back(i);
+  }
+  return vector;
+}
+//----------------------------------------------------------------------------------------------------
+std::vector<size_t> wallet2::select_available_unmixable_outputs()
+{
+  // request all outputs with at least 3 instances, so we can use mixin 2 with
+  epee::json_rpc::request<cryptonote::COMMAND_RPC_GET_OUTPUT_HISTOGRAM::request> req_t = AUTO_VAL_INIT(req_t);
+  epee::json_rpc::response<cryptonote::COMMAND_RPC_GET_OUTPUT_HISTOGRAM::response, std::string> resp_t = AUTO_VAL_INIT(resp_t);
+  m_daemon_rpc_mutex.lock();
+  req_t.jsonrpc = "2.0";
+  req_t.id = epee::serialization::storage_entry(0);
+  req_t.method = "get_output_histogram";
+  req_t.params.amounts = get_unspent_amounts_vector();
+  req_t.params.min_count = 3;
+  req_t.params.max_count = 0;
+  bool r = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/json_rpc", req_t, resp_t, m_http_client);
+  m_daemon_rpc_mutex.unlock();
+  THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "select_available_unmixable_outputs");
+  THROW_WALLET_EXCEPTION_IF(resp_t.result.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "get_output_histogram");
+  THROW_WALLET_EXCEPTION_IF(resp_t.result.status != CORE_RPC_STATUS_OK, error::get_histogram_error, resp_t.result.status);
+
+  std::set<uint64_t> mixable;
+  for (const auto &i: resp_t.result.histogram)
+  {
+    mixable.insert(i.amount);
+  }
+
+  return select_available_outputs([mixable](const transfer_details &td) {
+    const uint64_t amount = td.amount();
+    if (mixable.find(amount) == mixable.end())
+      return true;
+    return false;
+  });
+}
+//----------------------------------------------------------------------------------------------------
+std::vector<wallet2::pending_tx> wallet2::create_unmixable_sweep_transactions()
 {
   // From hard fork 1, we don't consider small amounts to be dust anymore
   const bool hf1_rules = use_fork_rules(2); // first hard fork has version 2
   tx_dust_policy dust_policy(hf1_rules ? 0 : ::config::DEFAULT_DUST_THRESHOLD);
 
-  size_t num_dust_outputs = 0;
-  for (transfer_container::const_iterator i = m_transfers.begin(); i != m_transfers.end(); ++i)
+  // may throw
+  std::vector<size_t> unmixable_outputs = select_available_unmixable_outputs();
+  size_t num_dust_outputs = unmixable_outputs.size();
+
+  if (num_dust_outputs == 0)
   {
-    const transfer_details& td = *i;
-    if (!td.m_spent && (td.amount() < dust_policy.dust_threshold || !is_valid_decomposed_amount(td.amount())) && is_transfer_unlocked(td))
-    {
-      num_dust_outputs++;
-    }
+    return std::vector<wallet2::pending_tx>();
   }
 
   // failsafe split attempt counter
@@ -2679,13 +2757,13 @@ std::vector<wallet2::pending_tx> wallet2::create_dust_sweep_transactions()
 	uint64_t needed_fee = 0;
 	do
 	{
-	  transfer_dust(num_outputs_per_tx, (uint64_t)0 /* unlock_time */, 0, detail::digit_split_strategy, dust_policy, extra, tx, ptx);
+	  transfer_from(unmixable_outputs, num_outputs_per_tx, (uint64_t)0 /* unlock_time */, 0, detail::digit_split_strategy, dust_policy, extra, tx, ptx);
 	  auto txBlob = t_serializable_object_to_blob(ptx.tx);
           needed_fee = calculate_fee(txBlob);
 
           // reroll the tx with the actual amount minus the fee
           // if there's not enough for the fee, it'll throw
-	  transfer_dust(num_outputs_per_tx, (uint64_t)0 /* unlock_time */, needed_fee, detail::digit_split_strategy, dust_policy, extra, tx, ptx);
+	  transfer_from(unmixable_outputs, num_outputs_per_tx, (uint64_t)0 /* unlock_time */, needed_fee, detail::digit_split_strategy, dust_policy, extra, tx, ptx);
 	  txBlob = t_serializable_object_to_blob(ptx.tx);
           needed_fee = calculate_fee(txBlob);
 	} while (ptx.fee < needed_fee);