wallet2: add on_reorg callback

src/wallet/wallet2.cpp

@@ -3851,7 +3851,7 @@ void wallet2::detach_blockchain(uint64_t height, std::map<std::pair<uint64_t, ui
   transfers_detached = std::distance(it, m_transfers.end());
   m_transfers.erase(it, m_transfers.end());
 
-  size_t blocks_detached = m_blockchain.size() - height;
+  const uint64_t blocks_detached = m_blockchain.size() - height;
   m_blockchain.crop(height);
 
   for (auto it = m_payments.begin(); it != m_payments.end(); )
@@ -3870,6 +3870,9 @@ void wallet2::detach_blockchain(uint64_t height, std::map<std::pair<uint64_t, ui
       ++it;
   }
 
+  if (m_callback)
+    m_callback->on_reorg(height, blocks_detached, transfers_detached);
+
   LOG_PRINT_L0("Detached blockchain on height " << height << ", transfers detached " << transfers_detached << ", blocks detached " << blocks_detached);
 }
 //----------------------------------------------------------------------------------------------------

src/wallet/wallet2.h

@@ -138,6 +138,7 @@ private:
   public:
     // Full wallet callbacks
     virtual void on_new_block(uint64_t height, const cryptonote::block& block) {}
+    virtual void on_reorg(uint64_t height, uint64_t blocks_detached, size_t transfers_detached) {}
     virtual void on_money_received(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& tx, uint64_t amount, uint64_t burnt, const cryptonote::subaddress_index& subaddr_index, bool is_change, uint64_t unlock_time) {}
     virtual void on_unconfirmed_money_received(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& tx, uint64_t amount, const cryptonote::subaddress_index& subaddr_index) {}
     virtual void on_money_spent(uint64_t height, const crypto::hash &txid, const cryptonote::transaction& in_tx, uint64_t amount, const cryptonote::transaction& spend_tx, const cryptonote::subaddress_index& subaddr_index) {}