Allow the wallet to access hard fork information

And make it change behavior slightly when close/after first hard fork

4 files changed, 21 insertions, 5 deletions

diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 55571f57b..badccd06f 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -3173,9 +3173,9 @@ HardFork::State Blockchain::get_hard_fork_state() const
   return m_hardfork->get_state();
 }
 
-bool Blockchain::get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const
+bool Blockchain::get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const
 {
-  return m_hardfork->get_voting_info(version, window, votes, threshold, voting);
+  return m_hardfork->get_voting_info(version, window, votes, threshold, earliest_height, voting);
 }
 
 bool Blockchain::for_all_key_images(std::function<bool(const crypto::key_image&)> f) const
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index e8f5a7e5b..1efc4e394 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -162,7 +162,7 @@ namespace cryptonote
     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 get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const;
 
     bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const;
     bool for_all_blocks(std::function<bool(uint64_t, const crypto::hash&, const block&)>) const;
diff --git a/src/cryptonote_core/hardfork.cpp b/src/cryptonote_core/hardfork.cpp
index 550047289..9bd4a337c 100644
--- a/src/cryptonote_core/hardfork.cpp
+++ b/src/cryptonote_core/hardfork.cpp
@@ -355,7 +355,16 @@ uint8_t HardFork::get_ideal_version(uint64_t height) const
   return original_version;
 }
 
-bool HardFork::get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const
+uint64_t HardFork::get_earliest_ideal_height_for_version(uint8_t version) const
+{
+  for (unsigned int n = heights.size() - 1; n > 0; --n) {
+    if (heights[n].version <= version)
+      return heights[n].height;
+  }
+  return 0;
+}
+
+bool HardFork::get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const
 {
   CRITICAL_REGION_LOCAL(lock);
 
@@ -367,6 +376,7 @@ bool HardFork::get_voting_info(uint8_t version, uint32_t &window, uint32_t &vote
       votes += last_versions[n];
   threshold = (window * heights[current_version].threshold + 99) / 100;
   assert((votes >= threshold) == enabled);
+  earliest_height = get_earliest_ideal_height_for_version(version);
   voting = heights.back().version;
   return enabled;
 }
diff --git a/src/cryptonote_core/hardfork.h b/src/cryptonote_core/hardfork.h
index 6d2a3c55b..d2f701799 100644
--- a/src/cryptonote_core/hardfork.h
+++ b/src/cryptonote_core/hardfork.h
@@ -184,6 +184,11 @@ namespace cryptonote
     uint8_t get_current_version() const;
 
     /**
+     * @brief returns the earliest block a given version may activate
+     */
+    uint64_t get_earliest_ideal_height_for_version(uint8_t version) const;
+
+    /**
      * @brief returns information about current voting state
      *
      * returns true if the given version is enabled (ie, the current version
@@ -193,8 +198,9 @@ namespace cryptonote
      * @param window the number of blocks considered in voting
      * @param votes number of votes for next version
      * @param threshold number of votes needed to switch to next version
+     * @param earliest_height earliest height at which the version can take effect
      */
-    bool get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const;
+    bool get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const;
 
     /**
      * @brief returns the size of the voting window in blocks