3 files changed, 20 insertions, 6 deletions
diff --git a/src/cryptonote_basic/difficulty.cpp b/src/cryptonote_basic/difficulty.cpp
index 5162e53e6..859173aa5 100644
--- a/src/cryptonote_basic/difficulty.cpp
+++ b/src/cryptonote_basic/difficulty.cpp
@@ -239,4 +239,19 @@ namespace cryptonote {
     return res.convert_to<difficulty_type>();
   }
 
+  std::string hex(difficulty_type v)
+  {
+    static const char chars[] = "0123456789abcdef";
+    std::string s;
+    while (v > 0)
+    {
+      s.push_back(chars[(v & 0xf).convert_to<unsigned>()]);
+      v >>= 4;
+    }
+    if (s.empty())
+      s += "0";
+    std::reverse(s.begin(), s.end());
+    return "0x" + s;
+  }
+
 }
diff --git a/src/cryptonote_basic/difficulty.h b/src/cryptonote_basic/difficulty.h
index f7a9376fb..02ed89e5a 100644
--- a/src/cryptonote_basic/difficulty.h
+++ b/src/cryptonote_basic/difficulty.h
@@ -32,6 +32,7 @@
 
 #include <cstdint>
 #include <vector>
+#include <string>
 #include <boost/multiprecision/cpp_int.hpp>
 
 #include "crypto/hash.h"
@@ -58,4 +59,6 @@ namespace cryptonote
     bool check_hash_128(const crypto::hash &hash, difficulty_type difficulty);
     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, size_t target_seconds);
+
+    std::string hex(difficulty_type v);
 }
diff --git a/src/cryptonote_basic/hardfork.cpp b/src/cryptonote_basic/hardfork.cpp
index 89bca2f09..61240ea37 100644
--- a/src/cryptonote_basic/hardfork.cpp
+++ b/src/cryptonote_basic/hardfork.cpp
@@ -266,11 +266,9 @@ bool HardFork::reorganize_from_chain_height(uint64_t height)
 bool HardFork::rescan_from_block_height(uint64_t height)
 {
   CRITICAL_REGION_LOCAL(lock);
-  db.block_txn_start(true);
-  if (height >= db.height()) {
-    db.block_txn_stop();
+  db_rtxn_guard rtxn_guard(&db);
+  if (height >= db.height())
     return false;
-  }
 
   versions.clear();
 
@@ -293,8 +291,6 @@ bool HardFork::rescan_from_block_height(uint64_t height)
     current_fork_index = voted;
   }
 
-  db.block_txn_stop();
-
   return true;
 }