rpc: add a dynamic fee estimation RPC call

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moneromooo-monero 2016-10-28 21:19:40 +01:00
parent 82dbba10d4
commit e6deb8abda
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GPG Key ID: 686F07454D6CEFC3
5 changed files with 76 additions and 0 deletions

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@ -2760,6 +2760,36 @@ bool Blockchain::check_fee(size_t blob_size, uint64_t fee) const
return true; return true;
} }
//------------------------------------------------------------------
uint64_t Blockchain::get_dynamic_per_kb_fee_estimate(uint64_t grace_blocks) const
{
const uint8_t version = get_current_hard_fork_version();
if (version < HF_VERSION_DYNAMIC_FEE)
return FEE_PER_KB;
if (grace_blocks >= CRYPTONOTE_REWARD_BLOCKS_WINDOW)
grace_blocks = CRYPTONOTE_REWARD_BLOCKS_WINDOW - 1;
std::vector<size_t> sz;
get_last_n_blocks_sizes(sz, CRYPTONOTE_REWARD_BLOCKS_WINDOW - grace_blocks);
for (size_t i = 0; i < grace_blocks; ++i)
sz.push_back(CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2);
uint64_t median = epee::misc_utils::median(sz);
if(median <= CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2)
median = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2;
uint64_t already_generated_coins = m_db->height() ? m_db->get_block_already_generated_coins(m_db->height() - 1) : 0;
uint64_t base_reward;
if (!get_block_reward(median, 1, already_generated_coins, base_reward, version))
return false;
uint64_t fee = get_dynamic_per_kb_fee(base_reward, median);
LOG_PRINT_L2("Estimating " << grace_blocks << "-block fee at " << print_money(fee) << "/kB");
return fee;
}
//------------------------------------------------------------------ //------------------------------------------------------------------
// This function checks to see if a tx is unlocked. unlock_time is either // This function checks to see if a tx is unlocked. unlock_time is either
// a block index or a unix time. // a block index or a unix time.

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@ -525,6 +525,20 @@ namespace cryptonote
*/ */
static uint64_t get_dynamic_per_kb_fee(uint64_t block_reward, size_t median_block_size); static uint64_t get_dynamic_per_kb_fee(uint64_t block_reward, size_t median_block_size);
/**
* @brief get dynamic per kB fee estimate for the next few blocks
*
* The dynamic fee is based on the block size in a past window, and
* the current block reward. It is expressed by kB. This function
* calculates an estimate for a dynamic fee which will be valid for
* the next grace_blocks
*
* @param grace_blocks number of blocks we want the fee to be valid for
*
* @return the per kB fee estimate
*/
uint64_t get_dynamic_per_kb_fee_estimate(uint64_t grace_blocks) const;
/** /**
* @brief validate a transaction's fee * @brief validate a transaction's fee
* *

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@ -1283,6 +1283,13 @@ namespace cryptonote
return true; return true;
} }
//------------------------------------------------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------------------------------------------------
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)
{
res.fee = m_core.get_blockchain_storage().get_dynamic_per_kb_fee_estimate(req.grace_blocks);
res.status = CORE_RPC_STATUS_OK;
return true;
}
//------------------------------------------------------------------------------------------------------------------------------
bool core_rpc_server::on_out_peers(const COMMAND_RPC_OUT_PEERS::request& req, COMMAND_RPC_OUT_PEERS::response& res) bool core_rpc_server::on_out_peers(const COMMAND_RPC_OUT_PEERS::request& req, COMMAND_RPC_OUT_PEERS::response& res)
{ {
// TODO // TODO

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@ -116,6 +116,7 @@ namespace cryptonote
MAP_JON_RPC_WE("get_output_histogram", on_get_output_histogram, COMMAND_RPC_GET_OUTPUT_HISTOGRAM) MAP_JON_RPC_WE("get_output_histogram", on_get_output_histogram, COMMAND_RPC_GET_OUTPUT_HISTOGRAM)
MAP_JON_RPC_WE("get_version", on_get_version, COMMAND_RPC_GET_VERSION) MAP_JON_RPC_WE("get_version", on_get_version, COMMAND_RPC_GET_VERSION)
MAP_JON_RPC_WE("get_coinbase_tx_sum", on_get_coinbase_tx_sum, COMMAND_RPC_GET_COINBASE_TX_SUM) MAP_JON_RPC_WE("get_coinbase_tx_sum", on_get_coinbase_tx_sum, COMMAND_RPC_GET_COINBASE_TX_SUM)
MAP_JON_RPC_WE("get_fee_estimate", on_get_per_kb_fee_estimate, COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE)
END_JSON_RPC_MAP() END_JSON_RPC_MAP()
END_URI_MAP2() END_URI_MAP2()
@ -162,6 +163,7 @@ namespace cryptonote
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); 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);
bool on_get_version(const COMMAND_RPC_GET_VERSION::request& req, COMMAND_RPC_GET_VERSION::response& res, epee::json_rpc::error& error_resp); bool on_get_version(const COMMAND_RPC_GET_VERSION::request& req, COMMAND_RPC_GET_VERSION::response& res, epee::json_rpc::error& error_resp);
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); 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);
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);
//----------------------- //-----------------------
private: private:

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@ -1266,4 +1266,27 @@ namespace cryptonote
END_KV_SERIALIZE_MAP() END_KV_SERIALIZE_MAP()
}; };
}; };
struct COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE
{
struct request
{
uint64_t grace_blocks;
BEGIN_KV_SERIALIZE_MAP()
KV_SERIALIZE(grace_blocks)
END_KV_SERIALIZE_MAP()
};
struct response
{
std::string status;
uint64_t fee;
BEGIN_KV_SERIALIZE_MAP()
KV_SERIALIZE(status)
KV_SERIALIZE(fee)
END_KV_SERIALIZE_MAP()
};
};
} }