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rpc: add a dynamic fee estimation RPC call
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@ -2760,6 +2760,36 @@ bool Blockchain::check_fee(size_t blob_size, uint64_t fee) const
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return true;
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}
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//------------------------------------------------------------------
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uint64_t Blockchain::get_dynamic_per_kb_fee_estimate(uint64_t grace_blocks) const
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{
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const uint8_t version = get_current_hard_fork_version();
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if (version < HF_VERSION_DYNAMIC_FEE)
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return FEE_PER_KB;
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if (grace_blocks >= CRYPTONOTE_REWARD_BLOCKS_WINDOW)
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grace_blocks = CRYPTONOTE_REWARD_BLOCKS_WINDOW - 1;
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std::vector<size_t> sz;
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get_last_n_blocks_sizes(sz, CRYPTONOTE_REWARD_BLOCKS_WINDOW - grace_blocks);
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for (size_t i = 0; i < grace_blocks; ++i)
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sz.push_back(CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2);
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uint64_t median = epee::misc_utils::median(sz);
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if(median <= CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2)
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median = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2;
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uint64_t already_generated_coins = m_db->height() ? m_db->get_block_already_generated_coins(m_db->height() - 1) : 0;
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uint64_t base_reward;
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if (!get_block_reward(median, 1, already_generated_coins, base_reward, version))
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return false;
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uint64_t fee = get_dynamic_per_kb_fee(base_reward, median);
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LOG_PRINT_L2("Estimating " << grace_blocks << "-block fee at " << print_money(fee) << "/kB");
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return fee;
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}
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//------------------------------------------------------------------
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// This function checks to see if a tx is unlocked. unlock_time is either
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// a block index or a unix time.
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@ -525,6 +525,20 @@ namespace cryptonote
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*/
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static uint64_t get_dynamic_per_kb_fee(uint64_t block_reward, size_t median_block_size);
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/**
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* @brief get dynamic per kB fee estimate for the next few blocks
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*
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* The dynamic fee is based on the block size in a past window, and
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* the current block reward. It is expressed by kB. This function
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* calculates an estimate for a dynamic fee which will be valid for
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* the next grace_blocks
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*
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* @param grace_blocks number of blocks we want the fee to be valid for
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*
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* @return the per kB fee estimate
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*/
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uint64_t get_dynamic_per_kb_fee_estimate(uint64_t grace_blocks) const;
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/**
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* @brief validate a transaction's fee
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*
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@ -1283,6 +1283,13 @@ namespace cryptonote
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return true;
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}
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//------------------------------------------------------------------------------------------------------------------------------
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bool core_rpc_server::on_get_per_kb_fee_estimate(const COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::request& req, COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::response& res, epee::json_rpc::error& error_resp)
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{
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res.fee = m_core.get_blockchain_storage().get_dynamic_per_kb_fee_estimate(req.grace_blocks);
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res.status = CORE_RPC_STATUS_OK;
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return true;
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}
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//------------------------------------------------------------------------------------------------------------------------------
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bool core_rpc_server::on_out_peers(const COMMAND_RPC_OUT_PEERS::request& req, COMMAND_RPC_OUT_PEERS::response& res)
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{
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// TODO
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@ -116,6 +116,7 @@ namespace cryptonote
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MAP_JON_RPC_WE("get_output_histogram", on_get_output_histogram, COMMAND_RPC_GET_OUTPUT_HISTOGRAM)
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MAP_JON_RPC_WE("get_version", on_get_version, COMMAND_RPC_GET_VERSION)
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MAP_JON_RPC_WE("get_coinbase_tx_sum", on_get_coinbase_tx_sum, COMMAND_RPC_GET_COINBASE_TX_SUM)
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MAP_JON_RPC_WE("get_fee_estimate", on_get_per_kb_fee_estimate, COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE)
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END_JSON_RPC_MAP()
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END_URI_MAP2()
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@ -162,6 +163,7 @@ namespace cryptonote
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bool on_get_output_histogram(const COMMAND_RPC_GET_OUTPUT_HISTOGRAM::request& req, COMMAND_RPC_GET_OUTPUT_HISTOGRAM::response& res, epee::json_rpc::error& error_resp);
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bool on_get_version(const COMMAND_RPC_GET_VERSION::request& req, COMMAND_RPC_GET_VERSION::response& res, epee::json_rpc::error& error_resp);
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bool on_get_coinbase_tx_sum(const COMMAND_RPC_GET_COINBASE_TX_SUM::request& req, COMMAND_RPC_GET_COINBASE_TX_SUM::response& res, epee::json_rpc::error& error_resp);
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bool on_get_per_kb_fee_estimate(const COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::request& req, COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::response& res, epee::json_rpc::error& error_resp);
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//-----------------------
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private:
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@ -1266,4 +1266,27 @@ namespace cryptonote
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END_KV_SERIALIZE_MAP()
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};
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};
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struct COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE
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{
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struct request
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{
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uint64_t grace_blocks;
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BEGIN_KV_SERIALIZE_MAP()
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KV_SERIALIZE(grace_blocks)
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END_KV_SERIALIZE_MAP()
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};
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struct response
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{
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std::string status;
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uint64_t fee;
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BEGIN_KV_SERIALIZE_MAP()
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KV_SERIALIZE(status)
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KV_SERIALIZE(fee)
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END_KV_SERIALIZE_MAP()
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};
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};
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}
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