Merge pull request #490

baf101e More changes for 2-min blocks Use the correct block time for realtime fuzz on locktime Use the correct block time to calculate next_difficulty on alt chains (will not work as-is with voting) Lock unit tests to original block time for now (Javier Smooth)
4fea1a5 Adjust difficulty target (2 min) and full reward zone (60 kbytes) for block version 2 (Javier Smooth)

9 files changed, 43 insertions, 30 deletions

diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index 303e12b3b..6053387ac 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -51,11 +51,12 @@
 
 // MONEY_SUPPLY - total number coins to be generated
 #define MONEY_SUPPLY                                    ((uint64_t)(-1))
-#define EMISSION_SPEED_FACTOR                           (20)
+#define EMISSION_SPEED_FACTOR_PER_MINUTE                (20)
 #define FINAL_SUBSIDY_PER_MINUTE                        ((uint64_t)300000000000) // 3 * pow(10, 11)
 
 #define CRYPTONOTE_REWARD_BLOCKS_WINDOW                 100
-#define CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE       20000 //size of block (bytes) after which reward for block calculated using block size
+#define CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE       60000 //size of block (bytes) after which reward for block calculated using block size
+#define CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1    20000 //size of block (bytes) after which reward for block calculated using block size - before first fork
 #define CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE          600
 #define CRYPTONOTE_DISPLAY_DECIMAL_POINT                12
 // COIN - number of smallest units in one coin
@@ -66,18 +67,20 @@
 #define ORPHANED_BLOCKS_MAX_COUNT                       100
 
 
-#define DIFFICULTY_TARGET                               60  // seconds
+#define DIFFICULTY_TARGET                               120  // seconds
+#define DIFFICULTY_TARGET_V1                            60  // seconds - before first fork
 #define DIFFICULTY_WINDOW                               720 // blocks
 #define DIFFICULTY_LAG                                  15  // !!!
 #define DIFFICULTY_CUT                                  60  // timestamps to cut after sorting
 #define DIFFICULTY_BLOCKS_COUNT                         DIFFICULTY_WINDOW + DIFFICULTY_LAG
 
 
+#define CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS_V1   DIFFICULTY_TARGET_V1 * CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS
 #define CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS      DIFFICULTY_TARGET * CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS
 #define CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS       1
 
 
-#define DIFFICULTY_BLOCKS_ESTIMATE_TIMESPAN             DIFFICULTY_TARGET //just alias
+#define DIFFICULTY_BLOCKS_ESTIMATE_TIMESPAN             DIFFICULTY_TARGET_V1 //just alias; used by tests
 
 
 #define BLOCKS_IDS_SYNCHRONIZING_DEFAULT_COUNT          10000  //by default, blocks ids count in synchronizing
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 49443e0e2..e6a233868 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -674,8 +674,8 @@ difficulty_type Blockchain::get_difficulty_for_next_block()
         m_timestamps = timestamps;
         m_difficulties = difficulties;
     }
-
-    return next_difficulty(timestamps, difficulties);
+    size_t target = get_current_hard_fork_version() < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET;
+    return next_difficulty(timestamps, difficulties, target);
 }
 //------------------------------------------------------------------
 // This function removes blocks from the blockchain until it gets to the
@@ -865,8 +865,11 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
         }
     }
 
+    // FIXME: This will fail if fork activation heights are subject to voting
+    size_t target = get_ideal_hard_fork_version(bei.height) < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET;
+
     // calculate the difficulty target for the block and return it
-    return next_difficulty(timestamps, cumulative_difficulties);
+    return next_difficulty(timestamps, cumulative_difficulties, target);
 }
 //------------------------------------------------------------------
 // This function does a sanity check on basic things that all miner
@@ -910,7 +913,7 @@ bool Blockchain::validate_miner_transaction(const block& b, size_t cumulative_bl
 
     std::vector<size_t> last_blocks_sizes;
     get_last_n_blocks_sizes(last_blocks_sizes, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
-    if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward))
+    if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward, get_current_hard_fork_version()))
     {
         LOG_PRINT_L1("block size " << cumulative_block_size << " is bigger than allowed for this blockchain");
         return false;
@@ -2194,7 +2197,7 @@ bool Blockchain::is_tx_spendtime_unlocked(uint64_t unlock_time) const
     {
         //interpret as time
         uint64_t current_time = static_cast<uint64_t>(time(NULL));
-        if(current_time + CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS >= unlock_time)
+        if(current_time + (get_current_hard_fork_version() < 2 ? CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS_V1 : CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS) >= unlock_time)
             return true;
         else
             return false;
@@ -2604,11 +2607,12 @@ bool Blockchain::handle_block_to_main_chain(const block& bl, const crypto::hash&
 
     TIME_MEASURE_FINISH(addblock);
 
-    update_next_cumulative_size_limit();
-
     // this will not fail since check succeeded above
     m_hardfork->add(bl, new_height - 1);
 
+    // do this after updating the hard fork state since the size limit may change due to fork
+    update_next_cumulative_size_limit();
+
     LOG_PRINT_L1("+++++ BLOCK SUCCESSFULLY ADDED" << std::endl << "id:\t" << id << std::endl << "PoW:\t" << proof_of_work << std::endl << "HEIGHT " << new_height << ", difficulty:\t" << current_diffic << std::endl << "block reward: " << print_money(fee_summary + base_reward) << "(" << print_money(base_reward) << " + " << print_money(fee_summary) << "), coinbase_blob_size: " << coinbase_blob_size << ", cumulative size: " << cumulative_block_size << ", " << block_processing_time << "(" << target_calculating_time << "/" << longhash_calculating_time << ")ms");
     if(m_show_time_stats)
     {
@@ -2630,13 +2634,15 @@ bool Blockchain::handle_block_to_main_chain(const block& bl, const crypto::hash&
 //------------------------------------------------------------------
 bool Blockchain::update_next_cumulative_size_limit()
 {
+    uint64_t full_reward_zone = get_current_hard_fork_version() < 2 ? CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1 : CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+
     LOG_PRINT_L3("Blockchain::" << __func__);
     std::vector<size_t> sz;
     get_last_n_blocks_sizes(sz, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
 
     uint64_t median = epee::misc_utils::median(sz);
-    if(median <= CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE)
-        median = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+    if(median <= full_reward_zone)
+      median = full_reward_zone;
 
     m_current_block_cumul_sz_limit = median*2;
     return true;
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index 00670c6d3..c83314634 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -160,6 +160,8 @@ namespace cryptonote
     HardFork::State get_hard_fork_state() const;
     uint8_t get_current_hard_fork_version() const { return m_hardfork->get_current_version(); }
     uint8_t get_ideal_hard_fork_version() const { return m_hardfork->get_ideal_version(); }
+    uint8_t get_ideal_hard_fork_version(uint64_t height) const { return m_hardfork->get_ideal_version(height); }
+
     bool get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const;
 
     bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const;
diff --git a/src/cryptonote_core/blockchain_storage.cpp b/src/cryptonote_core/blockchain_storage.cpp
index fa63efe0b..f7c9ffb78 100644
--- a/src/cryptonote_core/blockchain_storage.cpp
+++ b/src/cryptonote_core/blockchain_storage.cpp
@@ -430,7 +430,7 @@ difficulty_type blockchain_storage::get_difficulty_for_next_block() const
     timestamps.push_back(m_blocks[offset].bl.timestamp);
     commulative_difficulties.push_back(m_blocks[offset].cumulative_difficulty);
   }
-  return next_difficulty(timestamps, commulative_difficulties);
+  return next_difficulty(timestamps, commulative_difficulties,DIFFICULTY_TARGET_V1);
 }
 //------------------------------------------------------------------
 bool blockchain_storage::rollback_blockchain_switching(std::list<block>& original_chain, size_t rollback_height)
@@ -571,7 +571,7 @@ difficulty_type blockchain_storage::get_next_difficulty_for_alternative_chain(co
         break;
     }
   }
-  return next_difficulty(timestamps, commulative_difficulties);
+  return next_difficulty(timestamps, commulative_difficulties,DIFFICULTY_TARGET_V1);
 }
 //------------------------------------------------------------------
 bool blockchain_storage::prevalidate_miner_transaction(const block& b, uint64_t height) const
@@ -606,7 +606,7 @@ bool blockchain_storage::validate_miner_transaction(const block& b, size_t cumul
 
   std::vector<size_t> last_blocks_sizes;
   get_last_n_blocks_sizes(last_blocks_sizes, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
-  if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward)) {
+  if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward,0)) {
     LOG_PRINT_L1("block size " << cumulative_block_size << " is bigger than allowed for this blockchain");
     return false;
   }
@@ -1505,7 +1505,7 @@ bool blockchain_storage::is_tx_spendtime_unlocked(uint64_t unlock_time) const
   {
     //interpret as time
     uint64_t current_time = static_cast<uint64_t>(time(NULL));
-    if(current_time + CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS >= unlock_time)
+    if(current_time + CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS_V1 >= unlock_time)
       return true;
     else
       return false;
diff --git a/src/cryptonote_core/cryptonote_basic_impl.cpp b/src/cryptonote_core/cryptonote_basic_impl.cpp
index bd0b8a304..73e8d8fb9 100644
--- a/src/cryptonote_core/cryptonote_basic_impl.cpp
+++ b/src/cryptonote_core/cryptonote_basic_impl.cpp
@@ -73,16 +73,23 @@ namespace cryptonote {
     return CRYPTONOTE_MAX_TX_SIZE;
   }
   //-----------------------------------------------------------------------------------------------
-  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward) {
-    uint64_t base_reward = (MONEY_SUPPLY - already_generated_coins) >> EMISSION_SPEED_FACTOR;
-    if (base_reward < FINAL_SUBSIDY_PER_MINUTE)
+  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward, uint8_t version) {
+    static_assert(DIFFICULTY_TARGET%60==0&&DIFFICULTY_TARGET_V1%60==0,"difficulty targets must be a multiple of 60");
+    const int target = version < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET;
+    const int target_minutes = target / 60;
+    const int emission_speed_factor = EMISSION_SPEED_FACTOR_PER_MINUTE - (target_minutes-1);
+
+    uint64_t base_reward = (MONEY_SUPPLY - already_generated_coins) >> emission_speed_factor;
+    if (base_reward < FINAL_SUBSIDY_PER_MINUTE*target_minutes)
     {
-      base_reward = FINAL_SUBSIDY_PER_MINUTE;
+      base_reward = FINAL_SUBSIDY_PER_MINUTE*target_minutes;
     }
 
+    uint64_t full_reward_zone = version < 2 ? CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1 : CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+
     //make it soft
-    if (median_size < CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE) {
-      median_size = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+    if (median_size < full_reward_zone) {
+      median_size = full_reward_zone;
     }
 
     if (current_block_size <= median_size) {
diff --git a/src/cryptonote_core/cryptonote_basic_impl.h b/src/cryptonote_core/cryptonote_basic_impl.h
index 5c442d558..587ab0f12 100644
--- a/src/cryptonote_core/cryptonote_basic_impl.h
+++ b/src/cryptonote_core/cryptonote_basic_impl.h
@@ -71,7 +71,7 @@ namespace cryptonote {
   /************************************************************************/
   size_t get_max_block_size();
   size_t get_max_tx_size();
-  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward);
+  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward, uint8_t version);
   uint8_t get_account_address_checksum(const public_address_outer_blob& bl);
   uint8_t get_account_integrated_address_checksum(const public_integrated_address_outer_blob& bl);
 
diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index 56a3dd8de..ba4ecce3e 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -120,7 +120,7 @@ namespace cryptonote
     in.height = height;
 
     uint64_t block_reward;
-    if(!get_block_reward(median_size, current_block_size, already_generated_coins, block_reward))
+    if(!get_block_reward(median_size, current_block_size, already_generated_coins, block_reward, hard_fork_version))
     {
       LOG_PRINT_L0("Block is too big");
       return false;
diff --git a/src/cryptonote_core/difficulty.cpp b/src/cryptonote_core/difficulty.cpp
index 2b5466791..3c3f1dec1 100644
--- a/src/cryptonote_core/difficulty.cpp
+++ b/src/cryptonote_core/difficulty.cpp
@@ -157,8 +157,4 @@ namespace cryptonote {
     return (low + time_span - 1) / time_span;
   }
 
-  difficulty_type next_difficulty(vector<uint64_t> timestamps, vector<difficulty_type> cumulative_difficulties)
-  {
-    return next_difficulty(std::move(timestamps), std::move(cumulative_difficulties), DIFFICULTY_TARGET);
-  }
 }
diff --git a/src/cryptonote_core/difficulty.h b/src/cryptonote_core/difficulty.h
index 42d2df500..6e06dd702 100644
--- a/src/cryptonote_core/difficulty.h
+++ b/src/cryptonote_core/difficulty.h
@@ -40,6 +40,5 @@ namespace cryptonote
     typedef std::uint64_t difficulty_type;
 
     bool check_hash(const crypto::hash &hash, difficulty_type difficulty);
-    difficulty_type next_difficulty(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties);
     difficulty_type next_difficulty(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds);
 }