ArticMine's new block weight algorithm

This curbs runaway growth while still allowing substantial
spikes in block weight

Original specification from ArticMine:

here is the scaling proposal
Define: LongTermBlockWeight
Before fork:
LongTermBlockWeight = BlockWeight
At or after fork:
LongTermBlockWeight = min(BlockWeight, 1.4*LongTermEffectiveMedianBlockWeight)
Note: To avoid possible consensus issues over rounding the LongTermBlockWeight for a given block should be calculated to the nearest byte, and stored as a integer in the block itself. The stored LongTermBlockWeight is then used for future calculations of the LongTermEffectiveMedianBlockWeight and not recalculated each time.
Define:   LongTermEffectiveMedianBlockWeight
LongTermEffectiveMedianBlockWeight = max(300000, MedianOverPrevious100000Blocks(LongTermBlockWeight))
Change Definition of EffectiveMedianBlockWeight
From (current definition)
EffectiveMedianBlockWeight  = max(300000, MedianOverPrevious100Blocks(BlockWeight))
To (proposed definition)
EffectiveMedianBlockWeight  = min(max(300000, MedianOverPrevious100Blocks(BlockWeight)), 50*LongTermEffectiveMedianBlockWeight)
Notes:
1) There are no other changes to the existing penalty formula, median calculation, fees etc.
2) There is the requirement to store the LongTermBlockWeight of a block unencrypted in the block itself. This  is to avoid possible consensus issues over rounding and also to prevent the calculations from becoming unwieldy as we move away from the fork.
3) When the  EffectiveMedianBlockWeight cap is reached it is still possible to mine blocks up to 2x the EffectiveMedianBlockWeight by paying the corresponding penalty.

1 files changed, 21 insertions, 19 deletions

diff --git a/tests/unit_tests/hardfork.cpp b/tests/unit_tests/hardfork.cpp
index 47177db1c..5dd93dfaa 100644
--- a/tests/unit_tests/hardfork.cpp
+++ b/tests/unit_tests/hardfork.cpp
@@ -34,6 +34,7 @@
 #include "blockchain_db/blockchain_db.h"
 #include "cryptonote_basic/cryptonote_format_utils.h"
 #include "cryptonote_basic/hardfork.h"
+#include "blockchain_db/testdb.h"
 
 using namespace cryptonote;
 
@@ -41,7 +42,7 @@ using namespace cryptonote;
 #define SECONDS_PER_YEAR 31557600
 
 
-class TestDB: public BlockchainDB {
+class TestDB: public cryptonote::BaseTestDB {
 public:
   TestDB() {};
   virtual void open(const std::string& filename, const int db_flags = 0) { }
@@ -131,6 +132,7 @@ public:
 
   virtual void add_block( const block& blk
                         , size_t block_weight
+                        , uint64_t long_term_block_weight
                         , const difficulty_type& cumulative_difficulty
                         , const uint64_t& coins_generated
                         , uint64_t num_rct_outs
@@ -186,20 +188,20 @@ TEST(major, Only)
   ASSERT_FALSE(hf.add(mkblock(0, 2), 0));
   ASSERT_FALSE(hf.add(mkblock(2, 2), 0));
   ASSERT_TRUE(hf.add(mkblock(1, 2), 0));
-  db.add_block(mkblock(1, 1), 0, 0, 0, 0, crypto::hash());
+  db.add_block(mkblock(1, 1), 0, 0, 0, 0, 0, crypto::hash());
 
   // block height 1, only version 1 is accepted
   ASSERT_FALSE(hf.add(mkblock(0, 2), 1));
   ASSERT_FALSE(hf.add(mkblock(2, 2), 1));
   ASSERT_TRUE(hf.add(mkblock(1, 2), 1));
-  db.add_block(mkblock(1, 1), 0, 0, 0, 0, crypto::hash());
+  db.add_block(mkblock(1, 1), 0, 0, 0, 0, 0, crypto::hash());
 
   // block height 2, only version 2 is accepted
   ASSERT_FALSE(hf.add(mkblock(0, 2), 2));
   ASSERT_FALSE(hf.add(mkblock(1, 2), 2));
   ASSERT_FALSE(hf.add(mkblock(3, 2), 2));
   ASSERT_TRUE(hf.add(mkblock(2, 2), 2));
-  db.add_block(mkblock(2, 1), 0, 0, 0, 0, crypto::hash());
+  db.add_block(mkblock(2, 1), 0, 0, 0, 0, 0, crypto::hash());
 }
 
 TEST(empty_hardforks, Success)
@@ -213,7 +215,7 @@ TEST(empty_hardforks, Success)
   ASSERT_TRUE(hf.get_state(time(NULL) + 3600*24*400) == HardFork::Ready);
 
   for (uint64_t h = 0; h <= 10; ++h) {
-    db.add_block(mkblock(hf, h, 1), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, 1), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
   ASSERT_EQ(hf.get(0), 1);
@@ -247,14 +249,14 @@ TEST(check_for_height, Success)
   for (uint64_t h = 0; h <= 4; ++h) {
     ASSERT_TRUE(hf.check_for_height(mkblock(1, 1), h));
     ASSERT_FALSE(hf.check_for_height(mkblock(2, 2), h));  // block version is too high
-    db.add_block(mkblock(hf, h, 1), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, 1), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 
   for (uint64_t h = 5; h <= 10; ++h) {
     ASSERT_FALSE(hf.check_for_height(mkblock(1, 1), h));  // block version is too low
     ASSERT_TRUE(hf.check_for_height(mkblock(2, 2), h));
-    db.add_block(mkblock(hf, h, 2), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, 2), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 }
@@ -271,19 +273,19 @@ TEST(get, next_version)
 
   for (uint64_t h = 0; h <= 4; ++h) {
     ASSERT_EQ(2, hf.get_next_version());
-    db.add_block(mkblock(hf, h, 1), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, 1), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 
   for (uint64_t h = 5; h <= 9; ++h) {
     ASSERT_EQ(4, hf.get_next_version());
-    db.add_block(mkblock(hf, h, 2), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, 2), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 
   for (uint64_t h = 10; h <= 15; ++h) {
     ASSERT_EQ(4, hf.get_next_version());
-    db.add_block(mkblock(hf, h, 4), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, 4), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 }
@@ -324,7 +326,7 @@ TEST(steps_asap, Success)
   hf.init();
 
   for (uint64_t h = 0; h < 10; ++h) {
-    db.add_block(mkblock(hf, h, 9), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, 9), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 
@@ -351,7 +353,7 @@ TEST(steps_1, Success)
   hf.init();
 
   for (uint64_t h = 0 ; h < 10; ++h) {
-    db.add_block(mkblock(hf, h, h+1), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, h+1), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 
@@ -376,7 +378,7 @@ TEST(reorganize, Same)
     //                                 index  0  1  2  3  4  5  6  7  8  9
     static const uint8_t block_versions[] = { 1, 1, 4, 4, 7, 7, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9 };
     for (uint64_t h = 0; h < 20; ++h) {
-      db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, crypto::hash());
+      db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, 0, crypto::hash());
       ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
     }
 
@@ -407,7 +409,7 @@ TEST(reorganize, Changed)
   static const uint8_t block_versions[] =    { 1, 1, 4, 4, 7, 7, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9 };
   static const uint8_t expected_versions[] = { 1, 1, 1, 1, 1, 1, 4, 4, 7, 7, 9, 9, 9, 9, 9, 9 };
   for (uint64_t h = 0; h < 16; ++h) {
-    db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE (hf.add(db.get_block_from_height(h), h));
   }
 
@@ -427,7 +429,7 @@ TEST(reorganize, Changed)
   ASSERT_EQ(db.height(), 3);
   hf.reorganize_from_block_height(2);
   for (uint64_t h = 3; h < 16; ++h) {
-    db.add_block(mkblock(hf, h, block_versions_new[h]), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, block_versions_new[h]), 0, 0, 0, 0, 0, crypto::hash());
     bool ret = hf.add(db.get_block_from_height(h), h);
     ASSERT_EQ (ret, h < 15);
   }
@@ -451,7 +453,7 @@ TEST(voting, threshold)
 
     for (uint64_t h = 0; h <= 8; ++h) {
       uint8_t v = 1 + !!(h % 8);
-      db.add_block(mkblock(hf, h, v), 0, 0, 0, 0, crypto::hash());
+      db.add_block(mkblock(hf, h, v), 0, 0, 0, 0, 0, crypto::hash());
       bool ret = hf.add(db.get_block_from_height(h), h);
       if (h >= 8 && threshold == 87) {
         // for threshold 87, we reach the treshold at height 7, so from height 8, hard fork to version 2, but 8 tries to add 1
@@ -485,7 +487,7 @@ TEST(voting, different_thresholds)
     static const uint8_t expected_versions[] = { 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4 };
 
     for (uint64_t h = 0; h < sizeof(block_versions) / sizeof(block_versions[0]); ++h) {
-      db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, crypto::hash());
+      db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, 0, crypto::hash());
       bool ret = hf.add(db.get_block_from_height(h), h);
       ASSERT_EQ(ret, true);
     }
@@ -539,7 +541,7 @@ TEST(voting, info)
     ASSERT_EQ(expected_thresholds[h], threshold);
     ASSERT_EQ(4, voting);
 
-    db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, crypto::hash());
+    db.add_block(mkblock(hf, h, block_versions[h]), 0, 0, 0, 0, 0, crypto::hash());
     ASSERT_TRUE(hf.add(db.get_block_from_height(h), h));
   }
 }
@@ -602,7 +604,7 @@ TEST(reorganize, changed)
 #define ADD(v, h, a) \
   do { \
     cryptonote::block b = mkblock(hf, h, v); \
-    db.add_block(b, 0, 0, 0, 0, crypto::hash()); \
+    db.add_block(b, 0, 0, 0, 0, 0, crypto::hash()); \
     ASSERT_##a(hf.add(b, h)); \
   } while(0)
 #define ADD_TRUE(v, h) ADD(v, h, TRUE)