wallet: automatically use low priority if safe (no backlog & recent blocks not full)

src/simplewallet/simplewallet.cpp

@@ -1519,6 +1519,19 @@ bool simple_wallet::set_refresh_from_block_height(const std::vector<std::string>
   return true;
 }
 
+bool simple_wallet::set_auto_low_priority(const std::vector<std::string> &args/* = std::vector<std::string>()*/)
+{
+  const auto pwd_container = get_and_verify_password();
+  if (pwd_container)
+  {
+    parse_bool_and_use(args[1], [&](bool r) {
+      m_wallet->auto_low_priority(r);
+      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>()*/)
 {
   if(args.empty())
@@ -1691,7 +1704,9 @@ simple_wallet::simple_wallet()
                                   "confirm-backlog-threshold [n]\n "
                                   "  Set a threshold for confirm-backlog to only warn if the transaction backlog is greater than n blocks.\n "
                                   "refresh-from-block-height [n]\n "
-                                  "  Set the height before which to ignore blocks."));
+                                  "  Set the height before which to ignore blocks.\n "
+                                  "auto-low-priority <1|0>\n "
+                                  "  Whether to automatically use the low priority fee level when it's safe to do so."));
   m_cmd_binder.set_handler("encrypted_seed",
                            boost::bind(&simple_wallet::encrypted_seed, this, _1),
                            tr("Display the encrypted Electrum-style mnemonic seed."));
@@ -1858,6 +1873,7 @@ bool simple_wallet::set_variable(const std::vector<std::string> &args)
     success_msg_writer() << "confirm-backlog-threshold = " << m_wallet->get_confirm_backlog_threshold();
     success_msg_writer() << "confirm-export-overwrite = " << m_wallet->confirm_export_overwrite();
     success_msg_writer() << "refresh-from-block-height = " << m_wallet->get_refresh_from_block_height();
+    success_msg_writer() << "auto-low-priority = " << m_wallet->auto_low_priority();
     return true;
   }
   else
@@ -1907,6 +1923,7 @@ bool simple_wallet::set_variable(const std::vector<std::string> &args)
     CHECK_SIMPLE_VARIABLE("confirm-backlog-threshold", set_confirm_backlog_threshold, tr("unsigned integer"));
     CHECK_SIMPLE_VARIABLE("confirm-export-overwrite", set_confirm_export_overwrite, tr("0 or 1"));
     CHECK_SIMPLE_VARIABLE("refresh-from-block-height", set_refresh_from_block_height, tr("block height"));
+    CHECK_SIMPLE_VARIABLE("auto-low-priority", set_auto_low_priority, tr("0 or 1"));
   }
   fail_msg_writer() << tr("set: unrecognized argument(s)");
   return true;
@@ -3667,6 +3684,8 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
   if (local_args.size() > 0 && parse_priority(local_args[0], priority))
     local_args.erase(local_args.begin());
 
+  priority = m_wallet->adjust_priority(priority);
+
   size_t fake_outs_count = 0;
   if(local_args.size() > 0) {
     size_t ring_size;
@@ -4144,6 +4163,8 @@ bool simple_wallet::sweep_main(uint64_t below, const std::vector<std::string> &a
   if (local_args.size() > 0 && parse_priority(local_args[0], priority))
     local_args.erase(local_args.begin());
 
+  priority = m_wallet->adjust_priority(priority);
+
   size_t fake_outs_count = 0;
   if(local_args.size() > 0) {
     size_t ring_size;
@@ -4356,17 +4377,11 @@ bool simple_wallet::sweep_single(const std::vector<std::string> &args_)
 
   std::vector<std::string> local_args = args_;
 
-  int priority = 0;
+  uint32_t priority = 0;
-  if(local_args.size() > 0) {
+  if (local_args.size() > 0 && parse_priority(local_args[0], priority))
-    auto priority_pos = std::find(
-      allowed_priority_strings.begin(),
-      allowed_priority_strings.end(),
-      local_args[0]);
-    if(priority_pos != allowed_priority_strings.end()) {
     local_args.erase(local_args.begin());
-      priority = std::distance(allowed_priority_strings.begin(), priority_pos);
+
-    }
+  priority = m_wallet->adjust_priority(priority);
-  }
 
   size_t fake_outs_count = 0;
   if(local_args.size() > 0) {

src/simplewallet/simplewallet.h

@@ -130,6 +130,7 @@ namespace cryptonote
     bool set_confirm_backlog_threshold(const std::vector<std::string> &args = std::vector<std::string>());
     bool set_confirm_export_overwrite(const std::vector<std::string> &args = std::vector<std::string>());
     bool set_refresh_from_block_height(const std::vector<std::string> &args = std::vector<std::string>());
+    bool set_auto_low_priority(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);

src/wallet/api/wallet.cpp

@@ -1074,6 +1074,8 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
     if (fake_outs_count == 0)
         fake_outs_count = DEFAULT_MIXIN;
 
+    uint32_t adjusted_priority = m_wallet->adjust_priority(static_cast<uint32_t>(priority));
+
     PendingTransactionImpl * transaction = new PendingTransactionImpl(*this);
 
     do {
@@ -1133,7 +1135,7 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
                 de.is_subaddress = info.is_subaddress;
                 dsts.push_back(de);
                 transaction->m_pending_tx = m_wallet->create_transactions_2(dsts, fake_outs_count, 0 /* unlock_time */,
-                                                                          static_cast<uint32_t>(priority),
+                                                                          adjusted_priority,
                                                                           extra, subaddr_account, subaddr_indices, m_trustedDaemon);
             } else {
                 // for the GUI, sweep_all (i.e. amount set as "(all)") will always sweep all the funds in all the addresses
@@ -1143,7 +1145,7 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
                         subaddr_indices.insert(index);
                 }
                 transaction->m_pending_tx = m_wallet->create_transactions_all(0, info.address, info.is_subaddress, fake_outs_count, 0 /* unlock_time */,
-                                                                          static_cast<uint32_t>(priority),
+                                                                          adjusted_priority,
                                                                           extra, subaddr_account, subaddr_indices, m_trustedDaemon);
             }
 

src/wallet/api/wallet2_api.h

@@ -70,6 +70,7 @@ struct PendingTransaction
     };
 
     enum Priority {
+        Priority_Default = 0,
         Priority_Low = 1,
         Priority_Medium = 2,
         Priority_High = 3,

src/wallet/wallet2.cpp

@@ -612,6 +612,7 @@ wallet2::wallet2(bool testnet, bool restricted):
   m_confirm_backlog(true),
   m_confirm_backlog_threshold(0),
   m_confirm_export_overwrite(true),
+  m_auto_low_priority(true),
   m_is_initialized(false),
   m_restricted(restricted),
   is_old_file_format(false),
@@ -2447,6 +2448,9 @@ bool wallet2::store_keys(const std::string& keys_file_name, const epee::wipeable
   value2.SetInt(m_confirm_export_overwrite ? 1 :0);
   json.AddMember("confirm_export_overwrite", value2, json.GetAllocator());
 
+  value2.SetInt(m_auto_low_priority ? 1 : 0);
+  json.AddMember("auto_low_priority", value2, json.GetAllocator());
+
   value2.SetInt(m_testnet ? 1 :0);
   json.AddMember("testnet", value2, json.GetAllocator());
 
@@ -2529,6 +2533,7 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
     m_confirm_backlog = true;
     m_confirm_backlog_threshold = 0;
     m_confirm_export_overwrite = true;
+    m_auto_low_priority = true;
   }
   else if(json.IsObject())
   {
@@ -2630,6 +2635,8 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
     m_confirm_backlog_threshold = field_confirm_backlog_threshold;
     GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, confirm_export_overwrite, int, Int, false, true);
     m_confirm_export_overwrite = field_confirm_export_overwrite;
+    GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, m_auto_low_priority, int, Int, false, true);
+    m_auto_low_priority = field_m_auto_low_priority;
     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");
@@ -5033,6 +5040,90 @@ uint64_t wallet2::adjust_mixin(uint64_t mixin) const
   return mixin;
 }
 //----------------------------------------------------------------------------------------------------
+uint32_t wallet2::adjust_priority(uint32_t priority)
+{
+  if (priority == 0 && get_default_priority() != 1 && auto_low_priority())
+  {
+    try
+    {
+      // check if there's a backlog in the tx pool
+      const double fee_level = get_fee_multiplier(1) * get_per_kb_fee() * (12/(double)13) / (double)1024;
+      const std::vector<std::pair<uint64_t, uint64_t>> blocks = estimate_backlog({std::make_pair(fee_level, fee_level)});
+      if (blocks.size() != 1)
+      {
+        MERROR("Bad estimated backlog array size");
+        return priority;
+      }
+      else if (blocks[0].first > 0)
+      {
+        MINFO("We don't use the low priority because there's a backlog in the tx pool.");
+        return priority;
+      }
+
+      // get the current full reward zone
+      epee::json_rpc::request<cryptonote::COMMAND_RPC_GET_INFO::request> getinfo_req = AUTO_VAL_INIT(getinfo_req);
+      epee::json_rpc::response<cryptonote::COMMAND_RPC_GET_INFO::response, std::string> getinfo_res = AUTO_VAL_INIT(getinfo_res);
+      m_daemon_rpc_mutex.lock();
+      getinfo_req.jsonrpc = "2.0";
+      getinfo_req.id = epee::serialization::storage_entry(0);
+      getinfo_req.method = "get_info";
+      bool r = net_utils::invoke_http_json("/json_rpc", getinfo_req, getinfo_res, m_http_client);
+      m_daemon_rpc_mutex.unlock();
+      THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "get_info");
+      THROW_WALLET_EXCEPTION_IF(getinfo_res.result.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "get_info");
+      THROW_WALLET_EXCEPTION_IF(getinfo_res.result.status != CORE_RPC_STATUS_OK, error::get_tx_pool_error);
+      const uint64_t full_reward_zone = getinfo_res.result.block_size_limit / 2;
+
+      // get the last N block headers and sum the block sizes
+      const size_t N = 10;
+      if (m_blockchain.size() < N)
+      {
+        MERROR("The blockchain is too short");
+        return priority;
+      }
+      epee::json_rpc::request<cryptonote::COMMAND_RPC_GET_BLOCK_HEADERS_RANGE::request> getbh_req = AUTO_VAL_INIT(getbh_req);
+      epee::json_rpc::response<cryptonote::COMMAND_RPC_GET_BLOCK_HEADERS_RANGE::response, std::string> getbh_res = AUTO_VAL_INIT(getbh_res);
+      m_daemon_rpc_mutex.lock();
+      getbh_req.jsonrpc = "2.0";
+      getbh_req.id = epee::serialization::storage_entry(0);
+      getbh_req.method = "getblockheadersrange";
+      getbh_req.params.start_height = m_blockchain.size() - N;
+      getbh_req.params.end_height = m_blockchain.size() - 1;
+      r = net_utils::invoke_http_json("/json_rpc", getbh_req, getbh_res, m_http_client, rpc_timeout);
+      m_daemon_rpc_mutex.unlock();
+      THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "getblockheadersrange");
+      THROW_WALLET_EXCEPTION_IF(getbh_res.result.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "getblockheadersrange");
+      THROW_WALLET_EXCEPTION_IF(getbh_res.result.status != CORE_RPC_STATUS_OK, error::get_blocks_error, getbh_res.result.status);
+      if (getbh_res.result.headers.size() != N)
+      {
+        MERROR("Bad blockheaders size");
+        return priority;
+      }
+      size_t block_size_sum = 0;
+      for (const cryptonote::block_header_response &i : getbh_res.result.headers)
+      {
+        block_size_sum += i.block_size;
+      }
+
+      // estimate how 'full' the last N blocks are
+      const size_t P = 100 * block_size_sum / (N * full_reward_zone);
+      MINFO((boost::format("The last %d blocks fill roughly %d%% of the full reward zone.") % N % P).str());
+      if (P > 80)
+      {
+        MINFO("We don't use the low priority because recent blocks are quite full.");
+        return priority;
+      }
+      MINFO("We'll use the low priority because probably it's safe to do so.");
+      return 1;
+    }
+    catch (const std::exception &e)
+    {
+      MERROR(e.what());
+    }
+  }
+  return priority;
+}
+//----------------------------------------------------------------------------------------------------
 // separated the call(s) to wallet2::transfer into their own function
 //
 // this function will make multiple calls to wallet2::transfer if multiple

src/wallet/wallet2.h

@@ -838,6 +838,8 @@ namespace tools
     uint32_t get_confirm_backlog_threshold() const { return m_confirm_backlog_threshold; };
     bool confirm_export_overwrite() const { return m_confirm_export_overwrite; }
     void confirm_export_overwrite(bool always) { m_confirm_export_overwrite = always; }
+    bool auto_low_priority() const { return m_auto_low_priority; }
+    void auto_low_priority(bool value) { m_auto_low_priority = value; }
 
     bool get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys) const;
     void check_tx_key(const crypto::hash &txid, const crypto::secret_key &tx_key, const std::vector<crypto::secret_key> &additional_tx_keys, const cryptonote::account_public_address &address, uint64_t &received, bool &in_pool, uint64_t &confirmations);
@@ -962,6 +964,7 @@ namespace tools
     uint64_t get_fee_multiplier(uint32_t priority, int fee_algorithm = -1) const;
     uint64_t get_per_kb_fee() const;
     uint64_t adjust_mixin(uint64_t mixin) const;
+    uint32_t adjust_priority(uint32_t priority);
 
     // Light wallet specific functions
     // fetch unspent outs from lw node and store in m_transfers
@@ -1122,6 +1125,7 @@ namespace tools
     bool m_confirm_backlog;
     uint32_t m_confirm_backlog_threshold;
     bool m_confirm_export_overwrite;
+    bool m_auto_low_priority;
     bool m_is_initialized;
     NodeRPCProxy m_node_rpc_proxy;
     std::unordered_set<crypto::hash> m_scanned_pool_txs[2];

src/wallet/wallet_rpc_server.cpp

@@ -786,7 +786,8 @@ namespace tools
     try
     {
       uint64_t mixin = m_wallet->adjust_mixin(req.mixin);
-      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_2(dsts, mixin, req.unlock_time, req.priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
+      uint32_t priority = m_wallet->adjust_priority(req.priority);
+      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_2(dsts, mixin, req.unlock_time, priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
 
       if (ptx_vector.empty())
       {
@@ -837,8 +838,9 @@ namespace tools
     try
     {
       uint64_t mixin = m_wallet->adjust_mixin(req.mixin);
+      uint32_t priority = m_wallet->adjust_priority(req.priority);
       LOG_PRINT_L2("on_transfer_split calling create_transactions_2");
-      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_2(dsts, mixin, req.unlock_time, req.priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
+      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_2(dsts, mixin, req.unlock_time, priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
       LOG_PRINT_L2("on_transfer_split called create_transactions_2");
 
       return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, req.do_not_relay,
@@ -903,7 +905,8 @@ namespace tools
     try
     {
       uint64_t mixin = m_wallet->adjust_mixin(req.mixin);
-      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_all(req.below_amount, dsts[0].addr, dsts[0].is_subaddress, mixin, req.unlock_time, req.priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
+      uint32_t priority = m_wallet->adjust_priority(req.priority);
+      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_all(req.below_amount, dsts[0].addr, dsts[0].is_subaddress, mixin, req.unlock_time, priority, extra, req.account_index, req.subaddr_indices, m_trusted_daemon);
 
       return fill_response(ptx_vector, req.get_tx_keys, res.tx_key_list, res.amount_list, res.fee_list, res.multisig_txset, req.do_not_relay,
           res.tx_hash_list, req.get_tx_hex, res.tx_blob_list, req.get_tx_metadata, res.tx_metadata_list, er);
@@ -950,7 +953,8 @@ namespace tools
     try
     {
       uint64_t mixin = m_wallet->adjust_mixin(req.mixin);
-      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_single(ki, dsts[0].addr, dsts[0].is_subaddress, mixin, req.unlock_time, req.priority, extra, m_trusted_daemon);
+      uint32_t priority = m_wallet->adjust_priority(req.priority);
+      std::vector<wallet2::pending_tx> ptx_vector = m_wallet->create_transactions_single(ki, dsts[0].addr, dsts[0].is_subaddress, mixin, req.unlock_time, priority, extra, m_trusted_daemon);
 
       if (ptx_vector.empty())
       {