text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2016 The Bitcoin Core developers
  // Copyright (c) 2017-2019 The Raven Core developers
  // Copyright (c) 2020 The Miracle Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "validationinterface.h"
  
  #include "init.h"
  #include "primitives/block.h"
  #include "scheduler.h"
  #include "sync.h"
  #include "txmempool.h"
  #include "util.h"
  
  #include <list>
  #include <atomic>
  
  #include <boost/signals2/signal.hpp>
  
  struct MainSignalsInstance {
      boost::signals2::signal<void (const CBlockIndex *, const CBlockIndex *, bool fInitialDownload)> UpdatedBlockTip;
      boost::signals2::signal<void (const CTransactionRef &)> TransactionAddedToMempool;
      boost::signals2::signal<void (const std::shared_ptr<const CBlock> &, const CBlockIndex *pindex, const std::vector<CTransactionRef>&)> BlockConnected;
      boost::signals2::signal<void (const std::shared_ptr<const CBlock> &)> BlockDisconnected;
      boost::signals2::signal<void (const CTransactionRef &)> TransactionRemovedFromMempool;
      boost::signals2::signal<void (const CBlockLocator &)> SetBestChain;
      boost::signals2::signal<void (const uint256 &)> Inventory;
      boost::signals2::signal<void (int64_t nBestBlockTime, CConnman* connman)> Broadcast;
      boost::signals2::signal<void (const CBlock&, const CValidationState&)> BlockChecked;
      boost::signals2::signal<void (const CBlockIndex *, const std::shared_ptr<const CBlock>&)> NewPoWValidBlock;
      boost::signals2::signal<void (const uint256 &)> BlockFound;
      boost::signals2::signal<void (const std::string &)> TokenInventory;
  //    boost::signals2::signal<void (std::shared_ptr<CReserveScript>&)> ScriptForMining;
      
      // We are not allowed to assume the scheduler only runs in one thread,
      // but must ensure all callbacks happen in-order, so we end up creating
      // our own queue here :(
      SingleThreadedSchedulerClient m_schedulerClient;
  
      explicit MainSignalsInstance(CScheduler *pscheduler) : m_schedulerClient(pscheduler) {}
  };
  
  static CMainSignals g_signals;
  
  void CMainSignals::RegisterBackgroundSignalScheduler(CScheduler& scheduler) {
      assert(!m_internals);
      m_internals.reset(new MainSignalsInstance(&scheduler));
  }
  
  void CMainSignals::UnregisterBackgroundSignalScheduler() {
      m_internals.reset(nullptr);
  }
  
  void CMainSignals::FlushBackgroundCallbacks() {
      m_internals->m_schedulerClient.EmptyQueue();
  }
  
  void CMainSignals::RegisterWithMempoolSignals(CTxMemPool& pool) {
      pool.NotifyEntryRemoved.connect(boost::bind(&CMainSignals::MempoolEntryRemoved, this, boost::placeholders::_1, boost::placeholders::_2));
  }
  
  void CMainSignals::UnregisterWithMempoolSignals(CTxMemPool& pool) {
      pool.NotifyEntryRemoved.disconnect(boost::bind(&CMainSignals::MempoolEntryRemoved, this, boost::placeholders::_1, boost::placeholders::_2));
  }
  
  CMainSignals& GetMainSignals()
  {
      return g_signals;
  }
  
  void RegisterValidationInterface(CValidationInterface* pwalletIn) {
      g_signals.m_internals->UpdatedBlockTip.connect(boost::bind(&CValidationInterface::UpdatedBlockTip, pwalletIn, boost::placeholders::_1, boost::placeholders::_2, boost::placeholders::_3));
      g_signals.m_internals->TransactionAddedToMempool.connect(boost::bind(&CValidationInterface::TransactionAddedToMempool, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->BlockConnected.connect(boost::bind(&CValidationInterface::BlockConnected, pwalletIn, boost::placeholders::_1, boost::placeholders::_2, boost::placeholders::_3));
      g_signals.m_internals->BlockDisconnected.connect(boost::bind(&CValidationInterface::BlockDisconnected, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->TransactionRemovedFromMempool.connect(boost::bind(&CValidationInterface::TransactionRemovedFromMempool, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->SetBestChain.connect(boost::bind(&CValidationInterface::SetBestChain, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->Inventory.connect(boost::bind(&CValidationInterface::Inventory, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->Broadcast.connect(boost::bind(&CValidationInterface::ResendWalletTransactions, pwalletIn, boost::placeholders::_1, boost::placeholders::_2));
      g_signals.m_internals->BlockChecked.connect(boost::bind(&CValidationInterface::BlockChecked, pwalletIn, boost::placeholders::_1, boost::placeholders::_2));
      g_signals.m_internals->NewPoWValidBlock.connect(boost::bind(&CValidationInterface::NewPoWValidBlock, pwalletIn, boost::placeholders::_1, boost::placeholders::_2));
      g_signals.m_internals->BlockFound.connect(boost::bind(&CValidationInterface::BlockFound, pwalletIn, boost::placeholders::_1));
  //    g_signals.m_internals->ScriptForMining.connect(boost::bind(&CValidationInterface::GetScriptForMining, pwalletIn, boost::placeholders::_1));
  }
  
  void UnregisterValidationInterface(CValidationInterface* pwalletIn) {
      g_signals.m_internals->BlockChecked.disconnect(boost::bind(&CValidationInterface::BlockChecked, pwalletIn, boost::placeholders::_1, boost::placeholders::_2));
      g_signals.m_internals->Broadcast.disconnect(boost::bind(&CValidationInterface::ResendWalletTransactions, pwalletIn, boost::placeholders::_1, boost::placeholders::_2));
      g_signals.m_internals->Inventory.disconnect(boost::bind(&CValidationInterface::Inventory, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->SetBestChain.disconnect(boost::bind(&CValidationInterface::SetBestChain, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->TransactionAddedToMempool.disconnect(boost::bind(&CValidationInterface::TransactionAddedToMempool, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->BlockConnected.disconnect(boost::bind(&CValidationInterface::BlockConnected, pwalletIn, boost::placeholders::_1, boost::placeholders::_2, boost::placeholders::_3));
      g_signals.m_internals->BlockDisconnected.disconnect(boost::bind(&CValidationInterface::BlockDisconnected, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->TransactionRemovedFromMempool.disconnect(boost::bind(&CValidationInterface::TransactionRemovedFromMempool, pwalletIn, boost::placeholders::_1));
      g_signals.m_internals->UpdatedBlockTip.disconnect(boost::bind(&CValidationInterface::UpdatedBlockTip, pwalletIn, boost::placeholders::_1, boost::placeholders::_2, boost::placeholders::_3));
      g_signals.m_internals->NewPoWValidBlock.disconnect(boost::bind(&CValidationInterface::NewPoWValidBlock, pwalletIn, boost::placeholders::_1, boost::placeholders::_2));
      g_signals.m_internals->BlockFound.disconnect(boost::bind(&CValidationInterface::BlockFound, pwalletIn, boost::placeholders::_1));
  //    g_signals.m_internals->ScriptForMining.disconnect(boost::bind(&CValidationInterface::GetScriptForMining, pwalletIn, boost::placeholders::_1));
  }
  
  void UnregisterAllValidationInterfaces() {
      g_signals.m_internals->BlockChecked.disconnect_all_slots();
      g_signals.m_internals->Broadcast.disconnect_all_slots();
      g_signals.m_internals->Inventory.disconnect_all_slots();
      g_signals.m_internals->SetBestChain.disconnect_all_slots();
      g_signals.m_internals->TransactionAddedToMempool.disconnect_all_slots();
      g_signals.m_internals->BlockConnected.disconnect_all_slots();
      g_signals.m_internals->BlockDisconnected.disconnect_all_slots();
      g_signals.m_internals->TransactionRemovedFromMempool.disconnect_all_slots();
      g_signals.m_internals->UpdatedBlockTip.disconnect_all_slots();
      g_signals.m_internals->NewPoWValidBlock.disconnect_all_slots();
      g_signals.m_internals->BlockFound.disconnect_all_slots();
  //    g_signals.m_internals->ScriptForMining.disconnect_all_slots();
  }
  
  void CallFunctionInValidationInterfaceQueue(std::function<void ()> func) {
      g_signals.m_internals->m_schedulerClient.AddToProcessQueue(std::move(func));
  }
  
  void CMainSignals::MempoolEntryRemoved(CTransactionRef ptx, MemPoolRemovalReason reason) {
      if (reason != MemPoolRemovalReason::BLOCK && reason != MemPoolRemovalReason::CONFLICT) {
          m_internals->m_schedulerClient.AddToProcessQueue([ptx, this] {
              m_internals->TransactionRemovedFromMempool(ptx);
          });
      }
  }
  
  void CMainSignals::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) {
      m_internals->m_schedulerClient.AddToProcessQueue([pindexNew, pindexFork, fInitialDownload, this] {
          m_internals->UpdatedBlockTip(pindexNew, pindexFork, fInitialDownload);
      });
  }
  
  void CMainSignals::TransactionAddedToMempool(const CTransactionRef &ptx) {
      m_internals->m_schedulerClient.AddToProcessQueue([ptx, this] {
          m_internals->TransactionAddedToMempool(ptx);
      });
  }
  
  void CMainSignals::BlockConnected(const std::shared_ptr<const CBlock> &pblock, const CBlockIndex *pindex, const std::shared_ptr<const std::vector<CTransactionRef>>& pvtxConflicted) {
      m_internals->m_schedulerClient.AddToProcessQueue([pblock, pindex, pvtxConflicted, this] {
          m_internals->BlockConnected(pblock, pindex, *pvtxConflicted);
      });
  }
  
  void CMainSignals::BlockDisconnected(const std::shared_ptr<const CBlock> &pblock) {
      m_internals->m_schedulerClient.AddToProcessQueue([pblock, this] {
          m_internals->BlockDisconnected(pblock);
      });
  }
  
  void CMainSignals::SetBestChain(const CBlockLocator &locator) {
      m_internals->m_schedulerClient.AddToProcessQueue([locator, this] {
          m_internals->SetBestChain(locator);
      });
  }
  
  void CMainSignals::Inventory(const uint256 &hash) {
      m_internals->m_schedulerClient.AddToProcessQueue([hash, this] {
          m_internals->Inventory(hash);
      });
  }
  
  void CMainSignals::Broadcast(int64_t nBestBlockTime, CConnman* connman) {
      m_internals->Broadcast(nBestBlockTime, connman);
  }
  
  void CMainSignals::BlockChecked(const CBlock& block, const CValidationState& state) {
      m_internals->BlockChecked(block, state);
  }
  
  void CMainSignals::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock> &block) {
      m_internals->NewPoWValidBlock(pindex, block);
  }
  
  void CMainSignals::BlockFound(const uint256 &hash) {
      m_internals->BlockFound(hash);
  }
  
  