1 files changed, 185 insertions, 0 deletions
diff --git a/tests/block_weight/block_weight.cpp b/tests/block_weight/block_weight.cpp
new file mode 100644
index 000000000..57fcb497e
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+++ b/tests/block_weight/block_weight.cpp
@@ -0,0 +1,185 @@
+// Copyright (c) 2019, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#define IN_UNIT_TESTS
+
+#include <stdio.h>
+#include <math.h>
+#include "cryptonote_core/blockchain.h"
+#include "cryptonote_core/tx_pool.h"
+#include "cryptonote_core/cryptonote_core.h"
+#include "blockchain_db/testdb.h"
+
+#define LONG_TERM_BLOCK_WEIGHT_WINDOW 5000
+
+enum test_t
+{
+  test_max = 0,
+  test_lcg = 1,
+  test_min = 2,
+};
+
+namespace
+{
+
+class TestDB: public cryptonote::BaseTestDB
+{
+private:
+  struct block_t
+  {
+    size_t weight;
+    uint64_t long_term_weight;
+  };
+
+public:
+  TestDB() { m_open = true; }
+
+  virtual void add_block( const cryptonote::block& blk
+                        , size_t block_weight
+                        , uint64_t long_term_block_weight
+                        , const cryptonote::difficulty_type& cumulative_difficulty
+                        , const uint64_t& coins_generated
+                        , uint64_t num_rct_outs
+                        , const crypto::hash& blk_hash
+                        ) override {
+    blocks.push_back({block_weight, long_term_block_weight});
+  }
+  virtual uint64_t height() const override { return blocks.size(); }
+  virtual size_t get_block_weight(const uint64_t &h) const override { return blocks[h].weight; }
+  virtual uint64_t get_block_long_term_weight(const uint64_t &h) const override { return blocks[h].long_term_weight; }
+  virtual crypto::hash top_block_hash(uint64_t *block_height = NULL) const override {
+    uint64_t h = height();
+    crypto::hash top = crypto::null_hash;
+    if (h)
+      *(uint64_t*)&top = h - 1;
+    if (block_height)
+      *block_height = h - 1;
+    return top;
+  }
+  virtual void pop_block(cryptonote::block &blk, std::vector<cryptonote::transaction> &txs) override { blocks.pop_back(); }
+  virtual void set_hard_fork_version(uint64_t height, uint8_t version) override { if (height >= hf.size()) hf.resize(height + 1); hf[height] = version; }
+  virtual uint8_t get_hard_fork_version(uint64_t height) const override { if (height >= hf.size()) return 255; return hf[height]; }
+
+private:
+  std::vector<block_t> blocks;
+  std::vector<uint8_t> hf;
+};
+
+}
+
+#define PREFIX_WINDOW(hf_version,window) \
+  std::unique_ptr<cryptonote::Blockchain> bc; \
+  cryptonote::tx_memory_pool txpool(*bc); \
+  bc.reset(new cryptonote::Blockchain(txpool)); \
+  struct get_test_options { \
+    const std::pair<uint8_t, uint64_t> hard_forks[3]; \
+    const cryptonote::test_options test_options = { \
+      hard_forks, \
+      window, \
+    }; \
+    get_test_options(): hard_forks{std::make_pair(1, (uint64_t)0), std::make_pair((uint8_t)hf_version, (uint64_t)LONG_TERM_BLOCK_WEIGHT_WINDOW), std::make_pair((uint8_t)0, (uint64_t)0)} {} \
+  } opts; \
+  cryptonote::Blockchain *blockchain = bc.get(); \
+  bool r = blockchain->init(new TestDB(), cryptonote::FAKECHAIN, true, &opts.test_options, 0, NULL); \
+  if (!r) \
+  { \
+    fprintf(stderr, "Failed to init blockchain\n"); \
+    exit(1); \
+  }
+
+#define PREFIX(hf_version) PREFIX_WINDOW(hf_version, LONG_TERM_BLOCK_WEIGHT_WINDOW)
+
+static uint32_t lcg_seed = 0;
+
+static uint32_t lcg()
+{
+  lcg_seed = (lcg_seed * 0x100000001b3 + 0xcbf29ce484222325) & 0xffffffff;
+  return lcg_seed;
+}
+
+static void test(test_t t, uint64_t blocks)
+{
+  PREFIX(10);
+
+  for (uint64_t h = 0; h < LONG_TERM_BLOCK_WEIGHT_WINDOW; ++h)
+  {
+    cryptonote::block b;
+    b.major_version = 1;
+    b.minor_version = 1;
+    bc->get_db().add_block(std::make_pair(b, ""), 300000, 300000, bc->get_db().height(), bc->get_db().height(), {});
+    if (!bc->update_next_cumulative_weight_limit())
+    {
+      fprintf(stderr, "Failed to update cumulative weight limit 1\n");
+      exit(1);
+    }
+  }
+
+  for (uint64_t h = 0; h < blocks; ++h)
+  {
+    uint64_t w;
+    uint64_t effective_block_weight_median = bc->get_current_cumulative_block_weight_median();
+    switch (t)
+    {
+      case test_lcg:
+      {
+        uint32_t r = lcg();
+        int64_t wi = 90 + r % 500000 + 250000 + sin(h / 200.) * 350000;
+        w = wi < 90 ? 90 : wi;
+        break;
+      }
+      case test_max:
+        w = bc->get_current_cumulative_block_weight_limit();
+        break;
+      case test_min:
+        w = 90;
+        break;
+      default:
+        exit(1);
+    }
+    uint64_t ltw = bc->get_next_long_term_block_weight(w);
+    cryptonote::block b;
+    b.major_version = 10;
+    b.minor_version = 10;
+    bc->get_db().add_block(std::make_pair(std::move(b), ""), w, ltw, bc->get_db().height(), bc->get_db().height(), {});
+
+    if (!bc->update_next_cumulative_weight_limit())
+    {
+      fprintf(stderr, "Failed to update cumulative weight limit\n");
+      exit(1);
+    }
+    std::cout << "H " << h << ", BW " << w << ", EMBW " << effective_block_weight_median << ", LTBW " << ltw << std::endl;
+  }
+}
+
+int main()
+{
+  test(test_max, 2 * LONG_TERM_BLOCK_WEIGHT_WINDOW);
+  test(test_lcg, 9 * LONG_TERM_BLOCK_WEIGHT_WINDOW);
+  test(test_min, 1 * LONG_TERM_BLOCK_WEIGHT_WINDOW);
+  return 0;
+}