simplewallet: new "fee" command to display fee information

including expected transaction backlog at different priorities

src/simplewallet/simplewallet.cpp

@@ -391,6 +391,61 @@ bool simple_wallet::payment_id(const std::vector<std::string> &args/* = std::vec
   return true;
 }
 
+bool simple_wallet::print_fee_info(const std::vector<std::string> &args/* = std::vector<std::string>()*/)
+{
+  if (!try_connect_to_daemon())
+  {
+    fail_msg_writer() << tr("Cannot connect to daemon");
+    return true;
+  }
+  const uint64_t per_kb_fee = m_wallet->get_per_kb_fee();
+  const uint64_t typical_size_kb = 13;
+  message_writer() << (boost::format(tr("Current fee is %s monero per kB")) % print_money(per_kb_fee)).str();
+
+  std::vector<uint64_t> fees;
+  for (uint32_t priority = 1; priority <= 4; ++priority)
+  {
+    uint64_t mult = m_wallet->get_fee_multiplier(priority);
+    fees.push_back(per_kb_fee * typical_size_kb * mult);
+  }
+  std::vector<std::pair<uint64_t, uint64_t>> blocks;
+  try
+  {
+    uint64_t base_size = typical_size_kb * 1024;
+    blocks = m_wallet->estimate_backlog(base_size, base_size + 1023, fees);
+  }
+  catch (const std::exception &e)
+  {
+    fail_msg_writer() << tr("Error: failed to estimate backlog array size: ") << e.what();
+    return true;
+  }
+  if (blocks.size() != 4)
+  {
+    fail_msg_writer() << tr("Error: bad estimated backlog array size");
+    return true;
+  }
+
+  for (uint32_t priority = 1; priority <= 4; ++priority)
+  {
+    uint64_t nblocks_low = blocks[priority - 1].first;
+    uint64_t nblocks_high = blocks[priority - 1].second;
+    if (nblocks_low > 0)
+    {
+      std::string msg;
+      if (priority == m_wallet->get_default_priority() || (m_wallet->get_default_priority() == 0 && priority == 2))
+        msg = tr(" (current)");
+      uint64_t minutes_low = nblocks_low * DIFFICULTY_TARGET_V2 / 60, minutes_high = nblocks_high * DIFFICULTY_TARGET_V2 / 60;
+      if (nblocks_high == nblocks_low)
+        message_writer() << (boost::format(tr("%u block (%u minutes) backlog at priority %u%s")) % nblocks_low % minutes_low % priority % msg).str();
+      else
+        message_writer() << (boost::format(tr("%u to %u block (%u to %u minutes) backlog at priority %u")) % nblocks_low % nblocks_high % minutes_low % minutes_high % priority).str();
+    }
+    else
+      message_writer() << tr("No backlog at priority ") << priority;
+  }
+  return true;
+}
+
 bool simple_wallet::set_always_confirm_transfers(const std::vector<std::string> &args/* = std::vector<std::string>()*/)
 {
   const auto pwd_container = get_and_verify_password();
@@ -722,6 +777,7 @@ simple_wallet::simple_wallet()
   m_cmd_binder.set_handler("show_transfer", boost::bind(&simple_wallet::show_transfer, this, _1), tr("Show information about a transfer to/from this address"));
   m_cmd_binder.set_handler("password", boost::bind(&simple_wallet::change_password, this, _1), tr("Change wallet password"));
   m_cmd_binder.set_handler("payment_id", boost::bind(&simple_wallet::payment_id, this, _1), tr("Generate a new random full size payment id - these will be unencrypted on the blockchain, see integrated_address for encrypted short payment ids"));
+  m_cmd_binder.set_handler("fee", boost::bind(&simple_wallet::print_fee_info, this, _1), tr("Print information about fee and current transaction backlog"));
   m_cmd_binder.set_handler("help", boost::bind(&simple_wallet::help, this, _1), tr("Show this help"));
 }
 //----------------------------------------------------------------------------------------------------
@@ -2461,9 +2517,16 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
       }
       try
       {
-        uint64_t nblocks = m_wallet->estimate_backlog(size, fee);
+        std::vector<std::pair<uint64_t, uint64_t>> nblocks = m_wallet->estimate_backlog(size, size, {fee});
-        if (nblocks > 0)
+        if (nblocks.size() != 1)
-          prompt << (boost::format(tr("There is currently a %u block backlog at that fee level. Is this okay?  (Y/Yes/N/No)")) % nblocks).str();
+        {
+          prompt << "Internal error checking for backlog. " << tr("Is this okay anyway?  (Y/Yes/N/No): ");
+        }
+        else
+        {
+          if (nblocks[0].first > 0)
+            prompt << (boost::format(tr("There is currently a %u block backlog at that fee level. Is this okay?  (Y/Yes/N/No)")) % nblocks[0].first).str();
+        }
       }
       catch (const std::exception &e)
       {

src/simplewallet/simplewallet.h

@@ -175,6 +175,7 @@ namespace cryptonote
     bool show_transfer(const std::vector<std::string> &args);
     bool change_password(const std::vector<std::string>& args);
     bool payment_id(const std::vector<std::string> &args);
+    bool print_fee_info(const std::vector<std::string> &args);
 
     uint64_t get_daemon_blockchain_height(std::string& err);
     bool try_connect_to_daemon(bool silent = false, uint32_t* version = nullptr);

src/wallet/wallet2.cpp

@@ -3457,12 +3457,15 @@ bool wallet2::load_tx(const std::string &signed_filename, std::vector<tools::wal
   return true;
 }
 //----------------------------------------------------------------------------------------------------
-uint64_t wallet2::get_fee_multiplier(uint32_t priority, int fee_algorithm) const
+uint64_t wallet2::get_fee_multiplier(uint32_t priority, int fee_algorithm)
 {
   static const uint64_t old_multipliers[3] = {1, 2, 3};
   static const uint64_t new_multipliers[3] = {1, 20, 166};
   static const uint64_t newer_multipliers[4] = {1, 4, 20, 166};
 
+  if (fee_algorithm == -1)
+    fee_algorithm = get_fee_algorithm();
+
   // 0 -> default (here, x1 till fee algorithm 2, x4 from it)
   if (priority == 0)
     priority = m_default_priority;
@@ -5747,10 +5750,14 @@ bool wallet2::is_synced() const
   return get_blockchain_current_height() >= height;
 }
 //----------------------------------------------------------------------------------------------------
-uint64_t wallet2::estimate_backlog(uint64_t blob_size, uint64_t fee)
+std::vector<std::pair<uint64_t, uint64_t>> wallet2::estimate_backlog(uint64_t min_blob_size, uint64_t max_blob_size, const std::vector<uint64_t> &fees)
+{
+  THROW_WALLET_EXCEPTION_IF(min_blob_size == 0, error::wallet_internal_error, "Invalid 0 fee");
+  THROW_WALLET_EXCEPTION_IF(max_blob_size == 0, error::wallet_internal_error, "Invalid 0 fee");
+  for (uint64_t fee: fees)
   {
-  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);
@@ -5776,9 +5783,13 @@ uint64_t wallet2::estimate_backlog(uint64_t blob_size, uint64_t fee)
   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);
+  uint64_t full_reward_zone = resp_t.result.block_size_limit / 2;
 
-  double our_fee_byte = fee / (double)blob_size;
+  std::vector<std::pair<uint64_t, uint64_t>> blocks;
-  uint64_t priority_size = 0;
+  for (uint64_t fee: fees)
+  {
+    double our_fee_byte_min = fee / (double)min_blob_size, our_fee_byte_max = fee / (double)max_blob_size;
+    uint64_t priority_size_min = 0, priority_size_max = 0;
     for (const auto &i: res.result.backlog)
     {
       if (i.blob_size == 0)
@@ -5787,16 +5798,20 @@ uint64_t wallet2::estimate_backlog(uint64_t blob_size, uint64_t fee)
         continue;
       }
       double this_fee_byte = i.fee / (double)i.blob_size;
-    if (this_fee_byte < our_fee_byte)
+      if (this_fee_byte >= our_fee_byte_min)
-      continue;
+        priority_size_min += i.blob_size;
-    priority_size += i.blob_size;
+      if (this_fee_byte >= our_fee_byte_max)
+        priority_size_max += i.blob_size;
     }
 
-  uint64_t full_reward_zone = resp_t.result.block_size_limit / 2;
+    uint64_t nblocks_min = (priority_size_min + full_reward_zone - 1) / full_reward_zone;
-  uint64_t nblocks = (priority_size + full_reward_zone - 1) / full_reward_zone;
+    uint64_t nblocks_max = (priority_size_max + full_reward_zone - 1) / full_reward_zone;
-  MDEBUG("estimate_backlog: priority_size " << priority_size << " for " << our_fee_byte << " (" << our_fee_byte << " piconero fee/byte), "
+    MDEBUG("estimate_backlog: priority_size " << priority_size_min << " - " << priority_size_max << " for " << fee
-      << nblocks << " blocks at block size " << full_reward_zone);
+        << " (" << our_fee_byte_min << " - " << our_fee_byte_max << " piconero byte fee), "
-  return nblocks;
+        << nblocks_min << " - " << nblocks_max << " blocks at block size " << full_reward_zone);
+    blocks.push_back(std::make_pair(nblocks_min, nblocks_max));
+  }
+  return blocks;
 }
 //----------------------------------------------------------------------------------------------------
 void wallet2::generate_genesis(cryptonote::block& b) {

src/wallet/wallet2.h

@@ -604,7 +604,10 @@ namespace tools
 
     bool is_synced() const;
 
-    uint64_t estimate_backlog(uint64_t blob_size, uint64_t fee);
+    std::vector<std::pair<uint64_t, uint64_t>> estimate_backlog(uint64_t min_blob_size, uint64_t max_blob_size, const std::vector<uint64_t> &fees);
+
+    uint64_t get_fee_multiplier(uint32_t priority, int fee_algorithm = -1);
+    uint64_t get_per_kb_fee();
 
   private:
     /*!
@@ -646,9 +649,7 @@ namespace tools
     void parse_block_round(const cryptonote::blobdata &blob, cryptonote::block &bl, crypto::hash &bl_id, bool &error) const;
     uint64_t get_upper_transaction_size_limit();
     std::vector<uint64_t> get_unspent_amounts_vector();
-    uint64_t get_fee_multiplier(uint32_t priority, int fee_algorithm) const;
     uint64_t get_dynamic_per_kb_fee_estimate();
-    uint64_t get_per_kb_fee();
     float get_output_relatedness(const transfer_details &td0, const transfer_details &td1) const;
     std::vector<size_t> pick_preferred_rct_inputs(uint64_t needed_money) const;
     void set_spent(size_t idx, uint64_t height);