Wallet: Distingush amounts for a single subaddress

Adding a new `amounts` field ot the output of `get_transfers` RPC
method. This field specifies individual payments made to a single
subaddress in a single transaction, e.g., made by this command:

    transfer <addr1> <amount1> <addr1> <amount2>

4 files changed, 38 insertions, 2 deletions

diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index ea556ec45..a850f6bfb 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -1842,7 +1842,11 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
   // (that is, the prunable stuff may or may not be included)
   if (!miner_tx && !pool)
     process_unconfirmed(txid, tx, height);
-  std::unordered_map<cryptonote::subaddress_index, uint64_t> tx_money_got_in_outs;  // per receiving subaddress index
+
+  // per receiving subaddress index
+  std::unordered_map<cryptonote::subaddress_index, uint64_t> tx_money_got_in_outs;
+  std::unordered_map<cryptonote::subaddress_index, amounts_container> tx_amounts_individual_outs;
+
   crypto::public_key tx_pub_key = null_pkey;
   bool notify = false;
 
@@ -1971,6 +1975,10 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
           {
             hwdev.conceal_derivation(tx_scan_info[i].received->derivation, tx_pub_key, additional_tx_pub_keys.data, derivation, additional_derivations);
             scan_output(tx, miner_tx, tx_pub_key, i, tx_scan_info[i], num_vouts_received, tx_money_got_in_outs, outs, pool);
+            if (!tx_scan_info[i].error)
+            {
+              tx_amounts_individual_outs[tx_scan_info[i].received->index].push_back(tx_scan_info[i].money_transfered);
+            }
           }
         }
       }
@@ -1994,6 +2002,10 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
         {
           hwdev.conceal_derivation(tx_scan_info[i].received->derivation, tx_pub_key, additional_tx_pub_keys.data, derivation, additional_derivations);
           scan_output(tx, miner_tx, tx_pub_key, i, tx_scan_info[i], num_vouts_received, tx_money_got_in_outs, outs, pool);
+          if (!tx_scan_info[i].error)
+          {
+            tx_amounts_individual_outs[tx_scan_info[i].received->index].push_back(tx_scan_info[i].money_transfered);
+          }
         }
       }
     }
@@ -2010,6 +2022,10 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
           hwdev.set_mode(hw::device::NONE);
           hwdev.conceal_derivation(tx_scan_info[i].received->derivation, tx_pub_key, additional_tx_pub_keys.data, derivation, additional_derivations);
           scan_output(tx, miner_tx, tx_pub_key, i, tx_scan_info[i], num_vouts_received, tx_money_got_in_outs, outs, pool);
+          if (!tx_scan_info[i].error)
+          {
+            tx_amounts_individual_outs[tx_scan_info[i].received->index].push_back(tx_scan_info[i].money_transfered);
+          }
         }
       }
     }
@@ -2118,6 +2134,12 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
           THROW_WALLET_EXCEPTION_IF(tx_money_got_in_outs[tx_scan_info[o].received->index] < tx_scan_info[o].amount,
               error::wallet_internal_error, "Unexpected values of new and old outputs");
           tx_money_got_in_outs[tx_scan_info[o].received->index] -= tx_scan_info[o].amount;
+
+          amounts_container& tx_amounts_this_out = tx_amounts_individual_outs[tx_scan_info[o].received->index]; // Only for readability on the following lines
+          auto amount_iterator = std::find(tx_amounts_this_out.begin(), tx_amounts_this_out.end(), tx_scan_info[o].amount);
+          THROW_WALLET_EXCEPTION_IF(amount_iterator == tx_amounts_this_out.end(),
+              error::wallet_internal_error, "Unexpected values of new and old outputs");
+          tx_amounts_this_out.erase(amount_iterator);
         }
         else
         {
@@ -2183,6 +2205,8 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
     }
   }
 
+  THROW_WALLET_EXCEPTION_IF(tx_money_got_in_outs.size() != tx_amounts_individual_outs.size(), error::wallet_internal_error, "Inconsistent size of output arrays");
+
   uint64_t tx_money_spent_in_ins = 0;
   // The line below is equivalent to "boost::optional<uint32_t> subaddr_account;", but avoids the GCC warning: ‘*((void*)& subaddr_account +4)’ may be used uninitialized in this function
   // It's a GCC bug with boost::optional, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47679
@@ -2286,6 +2310,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
     if (subaddr_account && i->first.major == *subaddr_account)
     {
       sub_change += i->second;
+      tx_amounts_individual_outs.erase(i->first);
       i = tx_money_got_in_outs.erase(i);
     }
     else
@@ -2363,6 +2388,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
       payment.m_tx_hash      = txid;
       payment.m_fee          = fee;
       payment.m_amount       = i.second;
+      payment.m_amounts      = tx_amounts_individual_outs[i.first];
       payment.m_block_height = height;
       payment.m_unlock_time  = tx.unlock_time;
       payment.m_timestamp    = ts;
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index b6f72c7e1..f643c0d1a 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -360,10 +360,12 @@ private:
       END_SERIALIZE()
     };
 
+    typedef std::vector<uint64_t> amounts_container;
     struct payment_details
     {
       crypto::hash m_tx_hash;
       uint64_t m_amount;
+      amounts_container m_amounts;
       uint64_t m_fee;
       uint64_t m_block_height;
       uint64_t m_unlock_time;
@@ -1628,7 +1630,7 @@ BOOST_CLASS_VERSION(tools::wallet2::transfer_details, 12)
 BOOST_CLASS_VERSION(tools::wallet2::multisig_info, 1)
 BOOST_CLASS_VERSION(tools::wallet2::multisig_info::LR, 0)
 BOOST_CLASS_VERSION(tools::wallet2::multisig_tx_set, 1)
-BOOST_CLASS_VERSION(tools::wallet2::payment_details, 4)
+BOOST_CLASS_VERSION(tools::wallet2::payment_details, 5)
 BOOST_CLASS_VERSION(tools::wallet2::pool_payment_details, 1)
 BOOST_CLASS_VERSION(tools::wallet2::unconfirmed_transfer_details, 8)
 BOOST_CLASS_VERSION(tools::wallet2::confirmed_transfer_details, 6)
@@ -1939,6 +1941,9 @@ namespace boost
         return;
       }
       a & x.m_coinbase;
+      if (ver < 5)
+        return;
+      a & x.m_amounts;
     }
 
     template <class Archive>
diff --git a/src/wallet/wallet_rpc_server.cpp b/src/wallet/wallet_rpc_server.cpp
index de501f056..ae81e211e 100644
--- a/src/wallet/wallet_rpc_server.cpp
+++ b/src/wallet/wallet_rpc_server.cpp
@@ -326,6 +326,7 @@ namespace tools
     entry.height = pd.m_block_height;
     entry.timestamp = pd.m_timestamp;
     entry.amount = pd.m_amount;
+    entry.amounts = pd.m_amounts;
     entry.unlock_time = pd.m_unlock_time;
     entry.locked = !m_wallet->is_transfer_unlocked(pd.m_unlock_time, pd.m_block_height);
     entry.fee = pd.m_fee;
@@ -408,6 +409,7 @@ namespace tools
     entry.height = 0;
     entry.timestamp = pd.m_timestamp;
     entry.amount = pd.m_amount;
+    entry.amounts = pd.m_amounts;
     entry.unlock_time = pd.m_unlock_time;
     entry.locked = true;
     entry.fee = pd.m_fee;
diff --git a/src/wallet/wallet_rpc_server_commands_defs.h b/src/wallet/wallet_rpc_server_commands_defs.h
index 0c86f404d..9b7d72279 100644
--- a/src/wallet/wallet_rpc_server_commands_defs.h
+++ b/src/wallet/wallet_rpc_server_commands_defs.h
@@ -1354,6 +1354,7 @@ namespace wallet_rpc
     typedef epee::misc_utils::struct_init<response_t> response;
   };
 
+  typedef std::vector<uint64_t> amounts_container;
   struct transfer_entry
   {
     std::string txid;
@@ -1361,6 +1362,7 @@ namespace wallet_rpc
     uint64_t height;
     uint64_t timestamp;
     uint64_t amount;
+    amounts_container amounts;
     uint64_t fee;
     std::string note;
     std::list<transfer_destination> destinations;
@@ -1380,6 +1382,7 @@ namespace wallet_rpc
       KV_SERIALIZE(height);
       KV_SERIALIZE(timestamp);
       KV_SERIALIZE(amount);
+      KV_SERIALIZE(amounts);
       KV_SERIALIZE(fee);
       KV_SERIALIZE(note);
       KV_SERIALIZE(destinations);