Merge pull request #2355

f906d87e wallet: new option to check/confirm txpool backlog when sending (moneromooo-monero)
55bec1f0 rpc: add a new RPC to get current txpool backlog (sizes and fees) (moneromooo-monero)

11 files changed, 203 insertions, 3 deletions

diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index 19f4aaca9..98569b46b 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -246,6 +246,12 @@ namespace cryptonote
     return m_blockchain_storage.get_transactions_blobs(txs_ids, txs, missed_txs);
   }
   //-----------------------------------------------------------------------------------------------
+  bool core::get_txpool_backlog(std::vector<tx_backlog_entry>& backlog) const
+  {
+    m_mempool.get_transaction_backlog(backlog);
+    return true;
+  }
+  //-----------------------------------------------------------------------------------------------
   bool core::get_transactions(const std::vector<crypto::hash>& txs_ids, std::list<transaction>& txs, std::list<crypto::hash>& missed_txs) const
   {
     return m_blockchain_storage.get_transactions(txs_ids, txs, missed_txs);
diff --git a/src/cryptonote_core/cryptonote_core.h b/src/cryptonote_core/cryptonote_core.h
index f17a6dfe6..84f59919e 100644
--- a/src/cryptonote_core/cryptonote_core.h
+++ b/src/cryptonote_core/cryptonote_core.h
@@ -428,6 +428,13 @@ namespace cryptonote
      bool get_pool_transactions(std::list<transaction>& txs) const;
      
      /**
+      * @copydoc tx_memory_pool::get_txpool_backlog
+      *
+      * @note see tx_memory_pool::get_txpool_backlog
+      */
+     bool get_txpool_backlog(std::vector<tx_backlog_entry>& backlog) const;
+     
+     /**
       * @copydoc tx_memory_pool::get_transactions
       *
       * @note see tx_memory_pool::get_transactions
diff --git a/src/cryptonote_core/tx_pool.cpp b/src/cryptonote_core/tx_pool.cpp
index 73f519079..7b98acb63 100644
--- a/src/cryptonote_core/tx_pool.cpp
+++ b/src/cryptonote_core/tx_pool.cpp
@@ -553,6 +553,17 @@ namespace cryptonote
     });
   }
   //------------------------------------------------------------------
+  void tx_memory_pool::get_transaction_backlog(std::vector<tx_backlog_entry>& backlog) const
+  {
+    CRITICAL_REGION_LOCAL(m_transactions_lock);
+    CRITICAL_REGION_LOCAL1(m_blockchain);
+    const uint64_t now = time(NULL);
+    m_blockchain.for_all_txpool_txes([&backlog, now](const crypto::hash &txid, const txpool_tx_meta_t &meta, const cryptonote::blobdata *bd){
+      backlog.push_back({meta.blob_size, meta.fee, meta.receive_time - now});
+      return true;
+    });
+  }
+  //------------------------------------------------------------------
   void tx_memory_pool::get_transaction_stats(struct txpool_stats& stats) const
   {
     CRITICAL_REGION_LOCAL(m_transactions_lock);
diff --git a/src/cryptonote_core/tx_pool.h b/src/cryptonote_core/tx_pool.h
index 47a41d070..6414620c9 100644
--- a/src/cryptonote_core/tx_pool.h
+++ b/src/cryptonote_core/tx_pool.h
@@ -243,6 +243,13 @@ namespace cryptonote
     void get_transaction_hashes(std::vector<crypto::hash>& txs) const;
 
     /**
+     * @brief get (size, fee, receive time) for all transaction in the pool
+     *
+     * @param txs return-by-reference that data
+     */
+    void get_transaction_backlog(std::vector<tx_backlog_entry>& backlog) const;
+
+    /**
      * @brief get a summary statistics of all transaction hashes in the pool
      *
      * @param stats return-by-reference the pool statistics
diff --git a/src/rpc/core_rpc_server.cpp b/src/rpc/core_rpc_server.cpp
index a5de36118..02d2935f6 100644
--- a/src/rpc/core_rpc_server.cpp
+++ b/src/rpc/core_rpc_server.cpp
@@ -1725,6 +1725,26 @@ namespace cryptonote
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  bool core_rpc_server::on_get_txpool_backlog(const COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG::request& req, COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG::response& res, epee::json_rpc::error& error_resp)
+  {
+    if(!check_core_busy())
+    {
+      error_resp.code = CORE_RPC_ERROR_CODE_CORE_BUSY;
+      error_resp.message = "Core is busy.";
+      return false;
+    }
+
+    if (!m_core.get_txpool_backlog(res.backlog))
+    {
+      error_resp.code = CORE_RPC_ERROR_CODE_INTERNAL_ERROR;
+      error_resp.message = "Failed to get txpool backlog";
+      return false;
+    }
+
+    res.status = CORE_RPC_STATUS_OK;
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
 
   const command_line::arg_descriptor<std::string> core_rpc_server::arg_rpc_bind_port = {
       "rpc-bind-port"
diff --git a/src/rpc/core_rpc_server.h b/src/rpc/core_rpc_server.h
index 1d1d9da66..b526277a8 100644
--- a/src/rpc/core_rpc_server.h
+++ b/src/rpc/core_rpc_server.h
@@ -125,6 +125,7 @@ namespace cryptonote
         MAP_JON_RPC_WE_IF("get_alternate_chains",on_get_alternate_chains,       COMMAND_RPC_GET_ALTERNATE_CHAINS, !m_restricted)
         MAP_JON_RPC_WE_IF("relay_tx",            on_relay_tx,                   COMMAND_RPC_RELAY_TX, !m_restricted)
         MAP_JON_RPC_WE_IF("sync_info",           on_sync_info,                  COMMAND_RPC_SYNC_INFO, !m_restricted)
+        MAP_JON_RPC_WE_IF("get_txpool_backlog",  on_get_txpool_backlog,         COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG, !m_restricted)
       END_JSON_RPC_MAP()
     END_URI_MAP2()
 
@@ -182,6 +183,7 @@ namespace cryptonote
     bool on_get_alternate_chains(const COMMAND_RPC_GET_ALTERNATE_CHAINS::request& req, COMMAND_RPC_GET_ALTERNATE_CHAINS::response& res, epee::json_rpc::error& error_resp);
     bool on_relay_tx(const COMMAND_RPC_RELAY_TX::request& req, COMMAND_RPC_RELAY_TX::response& res, epee::json_rpc::error& error_resp);
     bool on_sync_info(const COMMAND_RPC_SYNC_INFO::request& req, COMMAND_RPC_SYNC_INFO::response& res, epee::json_rpc::error& error_resp);
+    bool on_get_txpool_backlog(const COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG::request& req, COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG::response& res, epee::json_rpc::error& error_resp);
     //-----------------------
 
 private:
diff --git a/src/rpc/core_rpc_server_commands_defs.h b/src/rpc/core_rpc_server_commands_defs.h
index c413f9af8..59508bcaa 100644
--- a/src/rpc/core_rpc_server_commands_defs.h
+++ b/src/rpc/core_rpc_server_commands_defs.h
@@ -1071,6 +1071,33 @@ namespace cryptonote
     };
   };
 
+  struct tx_backlog_entry
+  {
+    uint64_t blob_size;
+    uint64_t fee;
+    uint64_t time_in_pool;
+  };
+
+  struct COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG
+  {
+    struct request
+    {
+      BEGIN_KV_SERIALIZE_MAP()
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      std::string status;
+      std::vector<tx_backlog_entry> backlog;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(status)
+        KV_SERIALIZE_CONTAINER_POD_AS_BLOB(backlog)
+      END_KV_SERIALIZE_MAP()
+    };
+  };
+
   struct txpool_histo
   {
     uint32_t txs;
diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 1811eeb3c..59916c30a 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -646,6 +646,17 @@ bool simple_wallet::set_merge_destinations(const std::vector<std::string> &args/
   return true;
 }
 
+bool simple_wallet::set_confirm_backlog(const std::vector<std::string> &args/* = std::vector<std::string>()*/)
+{
+  const auto pwd_container = get_and_verify_password();
+  if (pwd_container)
+  {
+    m_wallet->confirm_backlog(is_it_true(args[1]));
+    m_wallet->rewrite(m_wallet_file, pwd_container->password());
+  }
+  return true;
+}
+
 bool simple_wallet::help(const std::vector<std::string> &args/* = std::vector<std::string>()*/)
 {
   success_msg_writer() << get_commands_str();
@@ -686,7 +697,7 @@ simple_wallet::simple_wallet()
   m_cmd_binder.set_handler("viewkey", boost::bind(&simple_wallet::viewkey, this, _1), tr("Display private view key"));
   m_cmd_binder.set_handler("spendkey", boost::bind(&simple_wallet::spendkey, this, _1), tr("Display private spend key"));
   m_cmd_binder.set_handler("seed", boost::bind(&simple_wallet::seed, this, _1), tr("Display Electrum-style mnemonic seed"));
-  m_cmd_binder.set_handler("set", boost::bind(&simple_wallet::set_variable, this, _1), tr("Available options: seed language - set wallet seed language; always-confirm-transfers <1|0> - whether to confirm unsplit txes; print-ring-members <1|0> - whether to print detailed information about ring members during confirmation; store-tx-info <1|0> - whether to store outgoing tx info (destination address, payment ID, tx secret key) for future reference; default-ring-size <n> - set default ring size (default is 5); auto-refresh <1|0> - whether to automatically sync new blocks from the daemon; refresh-type <full|optimize-coinbase|no-coinbase|default> - set wallet refresh behaviour; priority [0|1|2|3|4] - default/unimportant/normal/elevated/priority fee; confirm-missing-payment-id <1|0>; ask-password <1|0>; unit <monero|millinero|micronero|nanonero|piconero> - set default monero (sub-)unit; min-outputs-count [n] - try to keep at least that many outputs of value at least min-outputs-value; min-outputs-value [n] - try to keep at least min-outputs-count outputs of at least that value; merge-destinations <1|0> - whether to merge multiple payments to the same destination address"));
+  m_cmd_binder.set_handler("set", boost::bind(&simple_wallet::set_variable, this, _1), tr("Available options: seed language - set wallet seed language; always-confirm-transfers <1|0> - whether to confirm unsplit txes; print-ring-members <1|0> - whether to print detailed information about ring members during confirmation; store-tx-info <1|0> - whether to store outgoing tx info (destination address, payment ID, tx secret key) for future reference; default-ring-size <n> - set default ring size (default is 5); auto-refresh <1|0> - whether to automatically sync new blocks from the daemon; refresh-type <full|optimize-coinbase|no-coinbase|default> - set wallet refresh behaviour; priority [0|1|2|3|4] - default/unimportant/normal/elevated/priority fee; confirm-missing-payment-id <1|0>; ask-password <1|0>; unit <monero|millinero|micronero|nanonero|piconero> - set default monero (sub-)unit; min-outputs-count [n] - try to keep at least that many outputs of value at least min-outputs-value; min-outputs-value [n] - try to keep at least min-outputs-count outputs of at least that value; merge-destinations <1|0> - whether to merge multiple payments to the same destination address; confirm-backlog <1|0> - whether to warn if there is transaction backlog"));
   m_cmd_binder.set_handler("rescan_spent", boost::bind(&simple_wallet::rescan_spent, this, _1), tr("Rescan blockchain for spent outputs"));
   m_cmd_binder.set_handler("get_tx_key", boost::bind(&simple_wallet::get_tx_key, this, _1), tr("Get transaction key (r) for a given <txid>"));
   m_cmd_binder.set_handler("check_tx_key", boost::bind(&simple_wallet::check_tx_key, this, _1), tr("Check amount going to <address> in <txid>"));
@@ -728,6 +739,7 @@ bool simple_wallet::set_variable(const std::vector<std::string> &args)
     success_msg_writer() << "min-outputs-count = " << m_wallet->get_min_output_count();
     success_msg_writer() << "min-outputs-value = " << cryptonote::print_money(m_wallet->get_min_output_value());
     success_msg_writer() << "merge-destinations = " << m_wallet->merge_destinations();
+    success_msg_writer() << "confirm-backlog = " << m_wallet->confirm_backlog();
     return true;
   }
   else
@@ -773,6 +785,7 @@ bool simple_wallet::set_variable(const std::vector<std::string> &args)
     CHECK_SIMPLE_VARIABLE("min-outputs-count", set_min_output_count, tr("unsigned integer"));
     CHECK_SIMPLE_VARIABLE("min-outputs-value", set_min_output_value, tr("amount"));
     CHECK_SIMPLE_VARIABLE("merge-destinations", set_merge_destinations, tr("0 or 1"));
+    CHECK_SIMPLE_VARIABLE("confirm-backlog", set_confirm_backlog, tr("0 or 1"));
   }
   fail_msg_writer() << tr("set: unrecognized argument(s)");
   return true;
@@ -2421,6 +2434,49 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
       return true;
     }
 
+    // if we need to check for backlog, check the worst case tx
+    if (m_wallet->confirm_backlog())
+    {
+      std::stringstream prompt;
+      double worst_fee_per_byte = std::numeric_limits<double>::max();
+      uint64_t size = 0, fee = 0;
+      for (size_t n = 0; n < ptx_vector.size(); ++n)
+      {
+        const uint64_t blob_size = cryptonote::tx_to_blob(ptx_vector[n].tx).size();
+        const double fee_per_byte = ptx_vector[n].fee / (double)blob_size;
+        if (fee_per_byte < worst_fee_per_byte)
+        {
+          worst_fee_per_byte = fee_per_byte;
+          fee = ptx_vector[n].fee;
+        }
+        size += blob_size;
+      }
+      try
+      {
+        uint64_t nblocks = m_wallet->estimate_backlog(size, fee);
+        if (nblocks > 0)
+          prompt << (boost::format(tr("There is currently a %u block backlog at that fee level. Is this okay?  (Y/Yes/N/No)")) % nblocks).str();
+      }
+      catch (const std::exception &e)
+      {
+        prompt << tr("Failed to check for backlog: ") << e.what() << ENDL << tr("Is this okay anyway?  (Y/Yes/N/No): ");
+      }
+
+      std::string prompt_str = prompt.str();
+      if (!prompt_str.empty())
+      {
+        std::string accepted = command_line::input_line(prompt_str);
+        if (std::cin.eof())
+          return true;
+        if (!command_line::is_yes(accepted))
+        {
+          fail_msg_writer() << tr("transaction cancelled.");
+
+          return true; 
+        }
+      }
+    }
+
     // if more than one tx necessary, prompt user to confirm
     if (m_wallet->always_confirm_transfers() || ptx_vector.size() > 1)
     {
diff --git a/src/simplewallet/simplewallet.h b/src/simplewallet/simplewallet.h
index 8022c9bb2..eac4cbc99 100644
--- a/src/simplewallet/simplewallet.h
+++ b/src/simplewallet/simplewallet.h
@@ -120,6 +120,7 @@ namespace cryptonote
     bool set_min_output_count(const std::vector<std::string> &args = std::vector<std::string>());
     bool set_min_output_value(const std::vector<std::string> &args = std::vector<std::string>());
     bool set_merge_destinations(const std::vector<std::string> &args = std::vector<std::string>());
+    bool set_confirm_backlog(const std::vector<std::string> &args = std::vector<std::string>());
     bool help(const std::vector<std::string> &args = std::vector<std::string>());
     bool start_mining(const std::vector<std::string> &args);
     bool stop_mining(const std::vector<std::string> &args);
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index b63e07b2d..09ca8efe1 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -1963,6 +1963,9 @@ bool wallet2::store_keys(const std::string& keys_file_name, const std::string& p
   value2.SetInt(m_merge_destinations ? 1 :0);
   json.AddMember("merge_destinations", value2, json.GetAllocator());
 
+  value2.SetInt(m_confirm_backlog ? 1 :0);
+  json.AddMember("confirm_backlog", value2, json.GetAllocator());
+
   value2.SetInt(m_testnet ? 1 :0);
   json.AddMember("testnet", value2, json.GetAllocator());
 
@@ -2037,6 +2040,7 @@ bool wallet2::load_keys(const std::string& keys_file_name, const std::string& pa
     m_min_output_count = 0;
     m_min_output_value = 0;
     m_merge_destinations = false;
+    m_confirm_backlog = true;
   }
   else
   {
@@ -2107,6 +2111,8 @@ bool wallet2::load_keys(const std::string& keys_file_name, const std::string& pa
     m_min_output_value = field_min_output_value;
     GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, merge_destinations, int, Int, false, false);
     m_merge_destinations = field_merge_destinations;
+    GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, confirm_backlog, int, Int, false, true);
+    m_confirm_backlog = field_confirm_backlog;
     GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, testnet, int, Int, false, m_testnet);
     // Wallet is being opened with testnet flag, but is saved as a mainnet wallet
     THROW_WALLET_EXCEPTION_IF(m_testnet && !field_testnet, error::wallet_internal_error, "Mainnet wallet can not be opened as testnet wallet");
@@ -5741,6 +5747,58 @@ bool wallet2::is_synced() const
   return get_blockchain_current_height() >= height;
 }
 //----------------------------------------------------------------------------------------------------
+uint64_t wallet2::estimate_backlog(uint64_t blob_size, uint64_t fee)
+{
+  THROW_WALLET_EXCEPTION_IF(blob_size == 0, error::wallet_internal_error, "Invalid 0 fee");
+  THROW_WALLET_EXCEPTION_IF(fee == 0, error::wallet_internal_error, "Invalid 0 fee");
+
+  // get txpool backlog
+  epee::json_rpc::request<cryptonote::COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG::request> req = AUTO_VAL_INIT(req);
+  epee::json_rpc::response<cryptonote::COMMAND_RPC_GET_TRANSACTION_POOL_BACKLOG::response, std::string> res = AUTO_VAL_INIT(res);
+  m_daemon_rpc_mutex.lock();
+  req.jsonrpc = "2.0";
+  req.id = epee::serialization::storage_entry(0);
+  req.method = "get_txpool_backlog";
+  bool r = net_utils::invoke_http_json("/json_rpc", req, res, m_http_client, rpc_timeout);
+  m_daemon_rpc_mutex.unlock();
+  THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "Failed to connect to daemon");
+  THROW_WALLET_EXCEPTION_IF(res.result.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "get_txpool_backlog");
+  THROW_WALLET_EXCEPTION_IF(res.result.status != CORE_RPC_STATUS_OK, error::get_tx_pool_error);
+
+  epee::json_rpc::request<cryptonote::COMMAND_RPC_GET_INFO::request> req_t = AUTO_VAL_INIT(req_t);
+  epee::json_rpc::response<cryptonote::COMMAND_RPC_GET_INFO::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_info";
+  r = net_utils::invoke_http_json("/json_rpc", req_t, resp_t, m_http_client);
+  m_daemon_rpc_mutex.unlock();
+  THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "get_info");
+  THROW_WALLET_EXCEPTION_IF(resp_t.result.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "get_info");
+  THROW_WALLET_EXCEPTION_IF(resp_t.result.status != CORE_RPC_STATUS_OK, error::get_tx_pool_error);
+
+  double our_fee_byte = fee / (double)blob_size;
+  uint64_t priority_size = 0;
+  for (const auto &i: res.result.backlog)
+  {
+    if (i.blob_size == 0)
+    {
+      MWARNING("Got 0 sized blob from txpool, ignored");
+      continue;
+    }
+    double this_fee_byte = i.fee / (double)i.blob_size;
+    if (this_fee_byte < our_fee_byte)
+      continue;
+    priority_size += i.blob_size;
+  }
+
+  uint64_t full_reward_zone = resp_t.result.block_size_limit / 2;
+  uint64_t nblocks = (priority_size + full_reward_zone - 1) / full_reward_zone;
+  MDEBUG("estimate_backlog: priority_size " << priority_size << " for " << our_fee_byte << " (" << our_fee_byte << " piconero fee/byte), "
+      << nblocks << " blocks at block size " << full_reward_zone);
+  return nblocks;
+}
+//----------------------------------------------------------------------------------------------------
 void wallet2::generate_genesis(cryptonote::block& b) {
   if (m_testnet)
   {
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index ba9abacf5..f30c97635 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -105,7 +105,7 @@ namespace tools
     };
 
   private:
-    wallet2(const wallet2&) : m_run(true), m_callback(0), m_testnet(false), m_always_confirm_transfers(true), m_print_ring_members(false), m_store_tx_info(true), m_default_mixin(0), m_default_priority(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true), m_refresh_from_block_height(0), m_confirm_missing_payment_id(true), m_ask_password(true), m_min_output_count(0), m_min_output_value(0), m_merge_destinations(false), m_is_initialized(false),m_node_rpc_proxy(m_http_client, m_daemon_rpc_mutex) {}
+    wallet2(const wallet2&) : m_run(true), m_callback(0), m_testnet(false), m_always_confirm_transfers(true), m_print_ring_members(false), m_store_tx_info(true), m_default_mixin(0), m_default_priority(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true), m_refresh_from_block_height(0), m_confirm_missing_payment_id(true), m_ask_password(true), m_min_output_count(0), m_min_output_value(0), m_merge_destinations(false), m_confirm_backlog(true), m_is_initialized(false),m_node_rpc_proxy(m_http_client, m_daemon_rpc_mutex) {}
 
   public:
     static const char* tr(const char* str);
@@ -131,7 +131,7 @@ namespace tools
 
     static bool verify_password(const std::string& keys_file_name, const std::string& password, bool watch_only);
 
-    wallet2(bool testnet = false, bool restricted = false) : m_run(true), m_callback(0), m_testnet(testnet), m_always_confirm_transfers(true), m_print_ring_members(false), m_store_tx_info(true), m_default_mixin(0), m_default_priority(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true), m_refresh_from_block_height(0), m_confirm_missing_payment_id(true), m_ask_password(true), m_min_output_count(0), m_min_output_value(0), m_merge_destinations(false), m_is_initialized(false), m_restricted(restricted), is_old_file_format(false), m_node_rpc_proxy(m_http_client, m_daemon_rpc_mutex) {}
+    wallet2(bool testnet = false, bool restricted = false) : m_run(true), m_callback(0), m_testnet(testnet), m_always_confirm_transfers(true), m_print_ring_members(false), m_store_tx_info(true), m_default_mixin(0), m_default_priority(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true), m_refresh_from_block_height(0), m_confirm_missing_payment_id(true), m_ask_password(true), m_min_output_count(0), m_min_output_value(0), m_merge_destinations(false), m_confirm_backlog(true), m_is_initialized(false), m_restricted(restricted), is_old_file_format(false), m_node_rpc_proxy(m_http_client, m_daemon_rpc_mutex) {}
 
     struct transfer_details
     {
@@ -539,6 +539,8 @@ namespace tools
     uint64_t get_min_output_value() const { return m_min_output_value; }
     void merge_destinations(bool merge) { m_merge_destinations = merge; }
     bool merge_destinations() const { return m_merge_destinations; }
+    bool confirm_backlog() const { return m_confirm_backlog; }
+    void confirm_backlog(bool always) { m_confirm_backlog = always; }
 
     bool get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key) const;
 
@@ -602,6 +604,8 @@ namespace tools
 
     bool is_synced() const;
 
+    uint64_t estimate_backlog(uint64_t blob_size, uint64_t fee);
+
   private:
     /*!
      * \brief  Stores wallet information to wallet file.
@@ -700,6 +704,7 @@ namespace tools
     uint32_t m_min_output_count;
     uint64_t m_min_output_value;
     bool m_merge_destinations;
+    bool m_confirm_backlog;
     bool m_is_initialized;
     NodeRPCProxy m_node_rpc_proxy;
     std::unordered_set<crypto::hash> m_scanned_pool_txs[2];