final changes to get transaction splitting building. needs testing.

src/simplewallet/simplewallet.cpp

@@ -790,10 +790,10 @@ bool simple_wallet::show_blockchain_height(const std::vector<std::string>& args)
 //
 // split amount for each dst in dsts into num_splits parts
 // and make num_splits new vector<crypt...> instances to hold these new amounts
-vector<vector<cryptonote::tx_destination_entry>> simple_wallet::split_amounts(
-    vector<cryptonote::tx_destination_entry> dsts, size_t num_splits)
+std::vector<std::vector<cryptonote::tx_destination_entry>> simple_wallet::split_amounts(
+    std::vector<cryptonote::tx_destination_entry> dsts, size_t num_splits)
 {
-  vector<vector<cryptonote::tx_destination_entry>> retVal;
+  std::vector<std::vector<cryptonote::tx_destination_entry>> retVal;
 
   if (num_splits <= 1)
   {
@@ -804,7 +804,7 @@ vector<vector<cryptonote::tx_destination_entry>> simple_wallet::split_amounts(
   // for each split required
   for (size_t i=0; i < num_splits; i++)
   {
-    vector<cryptonote::tx_destination_entry> new_dsts;
+    std::vector<cryptonote::tx_destination_entry> new_dsts;
 
     // for each destination
     for (size_t j=0; j < dsts.size(); j++)
@@ -836,33 +836,94 @@ vector<vector<cryptonote::tx_destination_entry>> simple_wallet::split_amounts(
 //
 // this function will make multiple calls to wallet2::transfer if multiple
 // transactions will be required
-void simple_wallet::create_transactions(vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, const uint64_t fee, const std::vector<uint8_t> extra)
+void simple_wallet::create_transactions(std::vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, const uint64_t fee, const std::vector<uint8_t> extra)
 {
+  // for now, limit to 5 attempts.  TODO: discuss a good number to limit to.
+  const size_t MAX_ATTEMPTS = 5;
+
   // failsafe split attempt counter
   size_t attempt_count = 0;
 
-  for(attempt_count = 1;;attempt_count++)
+  for(attempt_count = 1; attempt_count <= 5 ;attempt_count++)
   {
+    auto split_values = split_amounts(dsts, attempt_count);
+
+    // Throw if split_amounts comes back with a vector of size different than it should
+    if (split_values.size() != attempt_count)
+    {
+      throw std::runtime_error("Splitting transactions returned a number of potential tx not equal to what was requested");
+    }
+
+    std::vector<tools::wallet2::pending_tx> ptx_vector;
     try
     {
-      vector<cryptonote::transaction> tx_vector;
       for (size_t i=0; i < attempt_count; i++)
       {
         cryptonote::transaction tx;
-        m_wallet->transfer(dsts, fake_outs_count, 0, DEFAULT_FEE, extra, tx);
-        tx_vector.push_back(tx);
+        tools::wallet2::pending_tx ptx;
+        m_wallet->transfer(dsts, fake_outs_count, unlock_time, fee, extra, tx, ptx);
+        ptx_vector.push_back(ptx);
+
+        // mark transfers to be used as "spent"
+        BOOST_FOREACH(tools::wallet2::transfer_container::iterator it, ptx.selected_transfers)
+          it->m_spent = true;
       }
+
+      // if we made it this far, we've selected our transactions.  committing them will mark them spent,
+      // so this is a failsafe in case they don't go through
+      // unmark pending tx transfers as spent
+      for (auto & ptx : ptx_vector)
+      {
+        // mark transfers to be used as not spent
+        BOOST_FOREACH(tools::wallet2::transfer_container::iterator it2, ptx.selected_transfers)
+          it2->m_spent = false;
+
+      }
+
       // if we made it this far, we're OK to actually send the transactions
+      while (!ptx_vector.empty())
+      {
+        m_wallet->commit_tx(ptx_vector.back());
+        // if no exception, remove element from vector
+        ptx_vector.pop_back();
+      }
+
     }
-        success_msg_writer(true) << "Money successfully sent, transaction " << get_transaction_hash(tx);
     // only catch this here, other exceptions need to pass through to the calling function
     catch (const tools::error::tx_too_big& e)
     {
-      cryptonote::transaction tx = e.tx();
-      fail_msg_writer() << "transaction " << get_transaction_hash(e.tx()) << " is too big. Transaction size: " <<
-          get_object_blobsize(e.tx()) << " bytes, transaction size limit: " << e.tx_size_limit() << " bytes";
+
+      // unmark pending tx transfers as spent
+      for (auto & ptx : ptx_vector)
+      {
+        // mark transfers to be used as not spent
+        BOOST_FOREACH(tools::wallet2::transfer_container::iterator it2, ptx.selected_transfers)
+          it2->m_spent = false;
+
+      }
+
+      if (attempt_count >= MAX_ATTEMPTS)
+      {
+        throw;
+      }
+    }
+    catch (...)
+    {
+      // in case of some other exception, make sure any tx in queue are marked unspent again
+
+      // unmark pending tx transfers as spent
+      for (auto & ptx : ptx_vector)
+      {
+        // mark transfers to be used as not spent
+        BOOST_FOREACH(tools::wallet2::transfer_container::iterator it2, ptx.selected_transfers)
+          it2->m_spent = false;
+
+      }
+
+      throw;
     }
   }
+  //success_msg_writer(true) << "Money successfully sent, transaction " << get_transaction_hash(tx);
 }
 
 //----------------------------------------------------------------------------------------------------
@@ -931,6 +992,7 @@ bool simple_wallet::transfer(const std::vector<std::string> &args_)
 
   try
   {
+    create_transactions(dsts, fake_outs_count, 0 /* unlock_time */, DEFAULT_FEE, extra);
   }
   catch (const tools::error::daemon_busy&)
   {
@@ -980,6 +1042,10 @@ bool simple_wallet::transfer(const std::vector<std::string> &args_)
   {
     fail_msg_writer() << "one of destinations is zero";
   }
+  catch (const tools::error::tx_too_big& e)
+  {
+    fail_msg_writer() << "Failed to find a suitable way to split transactions";
+  }
   catch (const tools::error::transfer_error& e)
   {
     LOG_ERROR("unknown transfer error: " << e.to_string());

src/simplewallet/simplewallet.h

@@ -54,10 +54,10 @@ namespace cryptonote
     bool show_payments(const std::vector<std::string> &args);
     bool show_blockchain_height(const std::vector<std::string> &args);
     bool transfer(const std::vector<std::string> &args);
-    vector<vector<cryptonote::tx_destination_entry>> simple_wallet::split_amounts(
-        vector<cryptonote::tx_destination_entry> dsts, size_t num_splits
+    std::vector<std::vector<cryptonote::tx_destination_entry>> split_amounts(
+        std::vector<cryptonote::tx_destination_entry> dsts, size_t num_splits
     );
-    void create_transactions(vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, const uint64_t fee, const std::vector<uint8_t> extra);
+    void create_transactions(std::vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, const uint64_t fee, const std::vector<uint8_t> extra);
     bool print_address(const std::vector<std::string> &args = std::vector<std::string>());
     bool save(const std::vector<std::string> &args);
     bool set_log(const std::vector<std::string> &args);

src/wallet/wallet2.cpp

@@ -685,16 +685,43 @@ void wallet2::add_unconfirmed_tx(const cryptonote::transaction& tx, uint64_t cha
 }
 //----------------------------------------------------------------------------------------------------
 void wallet2::transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count,
-                       uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, cryptonote::transaction& tx)
+                       uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, cryptonote::transaction& tx, pending_tx& ptx)
 {
-  transfer(dsts, fake_outputs_count, unlock_time, fee, extra, detail::digit_split_strategy, tx_dust_policy(fee), tx);
+  transfer(dsts, fake_outputs_count, unlock_time, fee, extra, detail::digit_split_strategy, tx_dust_policy(fee), tx, ptx);
 }
 //----------------------------------------------------------------------------------------------------
 void wallet2::transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count,
                        uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra)
 {
   cryptonote::transaction tx;
-  transfer(dsts, fake_outputs_count, unlock_time, fee, extra, tx);
+  pending_tx ptx;
+  transfer(dsts, fake_outputs_count, unlock_time, fee, extra, tx, ptx);
 }
 //----------------------------------------------------------------------------------------------------
+// take a pending tx and actually send it to the daemon
+void wallet2::commit_tx(pending_tx& ptx)
+{
+  using namespace cryptonote;
+  COMMAND_RPC_SEND_RAW_TX::request req;
+  req.tx_as_hex = epee::string_tools::buff_to_hex_nodelimer(tx_to_blob(ptx.tx));
+  COMMAND_RPC_SEND_RAW_TX::response daemon_send_resp;
+  bool r = epee::net_utils::invoke_http_json_remote_command2(m_daemon_address + "/sendrawtransaction", req, daemon_send_resp, m_http_client, 200000);
+  THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "sendrawtransaction");
+  THROW_WALLET_EXCEPTION_IF(daemon_send_resp.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "sendrawtransaction");
+  THROW_WALLET_EXCEPTION_IF(daemon_send_resp.status != CORE_RPC_STATUS_OK, error::tx_rejected, ptx.tx, daemon_send_resp.status);
+
+  add_unconfirmed_tx(ptx.tx, ptx.change_dts.amount);
+
+  LOG_PRINT_L2("transaction " << get_transaction_hash(ptx.tx) << " generated ok and sent to daemon, key_images: [" << ptx.key_images << "]");
+
+  BOOST_FOREACH(transfer_container::iterator it, ptx.selected_transfers)
+    it->m_spent = true;
+
+  LOG_PRINT_L0("Transaction successfully sent. <" << get_transaction_hash(ptx.tx) << ">" << ENDL
+                << "Commission: " << print_money(ptx.fee+ptx.dust) << " (dust: " << print_money(ptx.dust) << ")" << ENDL
+                << "Balance: " << print_money(balance()) << ENDL
+                << "Unlocked: " << print_money(unlocked_balance()) << ENDL
+                << "Please, wait for confirmation for your balance to be unlocked.");
+}
+
 }

src/wallet/wallet2.h

@@ -86,6 +86,15 @@ namespace tools
     typedef std::vector<transfer_details> transfer_container;
     typedef std::unordered_multimap<crypto::hash, payment_details> payment_container;
 
+    struct pending_tx
+    {
+      cryptonote::transaction tx;
+      uint64_t dust, fee;
+      cryptonote::tx_destination_entry change_dts;
+      std::list<transfer_container::iterator> selected_transfers;
+      std::string key_images;
+    };
+
     struct keys_file_data
     {
       crypto::chacha8_iv iv;
@@ -125,9 +134,10 @@ namespace tools
     template<typename T>
     void transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count, uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy);
     template<typename T>
-    void transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count, uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy, cryptonote::transaction &tx);
+    void transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count, uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy, cryptonote::transaction& tx, pending_tx& ptx);
     void transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count, uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra);
-    void transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count, uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, cryptonote::transaction& tx);
+    void transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count, uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, cryptonote::transaction& tx, pending_tx& ptx);
+    void commit_tx(pending_tx& ptx);
     bool check_connection();
     void get_transfers(wallet2::transfer_container& incoming_transfers) const;
     void get_payments(const crypto::hash& payment_id, std::list<wallet2::payment_details>& payments) const;
@@ -295,13 +305,14 @@ namespace tools
   void wallet2::transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count,
     uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy)
   {
+    pending_tx ptx;
     cryptonote::transaction tx;
-    transfer(dsts, fake_outputs_count, unlock_time, fee, extra, destination_split_strategy, dust_policy, tx);
+    transfer(dsts, fake_outputs_count, unlock_time, fee, extra, destination_split_strategy, dust_policy, tx, ptx);
   }
 
   template<typename T>
   void wallet2::transfer(const std::vector<cryptonote::tx_destination_entry>& dsts, size_t fake_outputs_count,
-    uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy, cryptonote::transaction &tx)
+    uint64_t unlock_time, uint64_t fee, const std::vector<uint8_t>& extra, T destination_split_strategy, const tx_dust_policy& dust_policy, cryptonote::transaction& tx, pending_tx &ptx)
   {
     using namespace cryptonote;
     // throw if attempting a transaction with no destinations
@@ -432,25 +443,14 @@ namespace tools
     });
     THROW_WALLET_EXCEPTION_IF(!all_are_txin_to_key, error::unexpected_txin_type, tx);
 
-    COMMAND_RPC_SEND_RAW_TX::request req;
-    req.tx_as_hex = epee::string_tools::buff_to_hex_nodelimer(tx_to_blob(tx));
-    COMMAND_RPC_SEND_RAW_TX::response daemon_send_resp;
-    r = epee::net_utils::invoke_http_json_remote_command2(m_daemon_address + "/sendrawtransaction", req, daemon_send_resp, m_http_client, 200000);
-    THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "sendrawtransaction");
-    THROW_WALLET_EXCEPTION_IF(daemon_send_resp.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "sendrawtransaction");
-    THROW_WALLET_EXCEPTION_IF(daemon_send_resp.status != CORE_RPC_STATUS_OK, error::tx_rejected, tx, daemon_send_resp.status);
-
-    add_unconfirmed_tx(tx, change_dts.amount);
+    ptx.key_images = key_images;
+    ptx.fee = fee;
+    ptx.dust = dust;
+    ptx.tx = tx;
+    ptx.change_dts = change_dts;
+    ptx.selected_transfers = selected_transfers;
 
-    LOG_PRINT_L2("transaction " << get_transaction_hash(tx) << " generated ok and sent to daemon, key_images: [" << key_images << "]");
+  }
 
-    BOOST_FOREACH(transfer_container::iterator it, selected_transfers)
-      it->m_spent = true;
 
-    LOG_PRINT_L0("Transaction successfully sent. <" << get_transaction_hash(tx) << ">" << ENDL
-                  << "Commission: " << print_money(fee+dust) << " (dust: " << print_money(dust) << ")" << ENDL
-                  << "Balance: " << print_money(balance()) << ENDL
-                  << "Unlocked: " << print_money(unlocked_balance()) << ENDL
-                  << "Please, wait for confirmation for your balance to be unlocked.");
-  }
 }

src/wallet/wallet_rpc_server.cpp

@@ -132,7 +132,8 @@ namespace tools
     try
     {
       cryptonote::transaction tx;
-      m_wallet.transfer(dsts, req.mixin, req.unlock_time, req.fee, extra, tx);
+      wallet2::pending_tx ptx;
+      m_wallet.transfer(dsts, req.mixin, req.unlock_time, req.fee, extra, tx, ptx);
       res.tx_hash = boost::lexical_cast<std::string>(cryptonote::get_transaction_hash(tx));
       return true;
     }

tests/functional_tests/transactions_flow_test.cpp

@@ -52,7 +52,9 @@ bool do_send_money(tools::wallet2& w1, tools::wallet2& w2, size_t mix_in_factor,
 
   try
   {
-    w1.transfer(dsts, mix_in_factor, 0, DEFAULT_FEE, std::vector<uint8_t>(), tools::detail::null_split_strategy, tools::tx_dust_policy(DEFAULT_FEE), tx);
+    tools::wallet2::pending_tx ptx;
+    w1.transfer(dsts, mix_in_factor, 0, DEFAULT_FEE, std::vector<uint8_t>(), tools::detail::null_split_strategy, tools::tx_dust_policy(DEFAULT_FEE), tx, ptx);
+    w1.commit_tx(ptx);
     return true;
   }
   catch (const std::exception&)