text: // Copyright (c) 2018-2019 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_INTERFACES_NODE_H
  #define BITCOIN_INTERFACES_NODE_H
  
  #include <amount.h>     // For CAmount
  #include <net.h>        // For CConnman::NumConnections
  #include <net_types.h>  // For banmap_t
  #include <netaddress.h> // For Network
  #include <support/allocators/secure.h> // For SecureString
  #include <util/translation.h>
  
  #include <functional>
  #include <memory>
  #include <stddef.h>
  #include <stdint.h>
  #include <string>
  #include <tuple>
  #include <vector>
  
  class BanMan;
  class CCoinControl;
  class CFeeRate;
  class CNodeStats;
  class Coin;
  class RPCTimerInterface;
  class UniValue;
  class proxyType;
  enum class SynchronizationState;
  struct CNodeStateStats;
  struct NodeContext;
  struct bilingual_str;
  
  namespace interfaces {
  class Handler;
  class WalletClient;
  struct BlockTip;
  
  //! Block and header tip information
  struct BlockAndHeaderTipInfo
  {
      int block_height;
      int64_t block_time;
      int header_height;
      int64_t header_time;
      double verification_progress;
  };
  
  //! Top-level interface for a groestlcoin node (groestlcoind process).
  class Node
  {
  public:
      virtual ~Node() {}
  
      //! Init logging.
      virtual void initLogging() = 0;
  
      //! Init parameter interaction.
      virtual void initParameterInteraction() = 0;
  
      //! Get warnings.
      virtual bilingual_str getWarnings() = 0;
  
      // Get log flags.
      virtual uint32_t getLogCategories() = 0;
  
      //! Initialize app dependencies.
      virtual bool baseInitialize() = 0;
  
      //! Start node.
      virtual bool appInitMain(interfaces::BlockAndHeaderTipInfo* tip_info = nullptr) = 0;
  
      //! Stop node.
      virtual void appShutdown() = 0;
  
      //! Start shutdown.
      virtual void startShutdown() = 0;
  
      //! Return whether shutdown was requested.
      virtual bool shutdownRequested() = 0;
  
      //! Map port.
      virtual void mapPort(bool use_upnp) = 0;
  
      //! Get proxy.
      virtual bool getProxy(Network net, proxyType& proxy_info) = 0;
  
      //! Get number of connections.
      virtual size_t getNodeCount(CConnman::NumConnections flags) = 0;
  
      //! Get stats for connected nodes.
      using NodesStats = std::vector<std::tuple<CNodeStats, bool, CNodeStateStats>>;
      virtual bool getNodesStats(NodesStats& stats) = 0;
  
      //! Get ban map entries.
      virtual bool getBanned(banmap_t& banmap) = 0;
  
      //! Ban node.
      virtual bool ban(const CNetAddr& net_addr, int64_t ban_time_offset) = 0;
  
      //! Unban node.
      virtual bool unban(const CSubNet& ip) = 0;
  
      //! Disconnect node by address.
      virtual bool disconnectByAddress(const CNetAddr& net_addr) = 0;
  
      //! Disconnect node by id.
      virtual bool disconnectById(NodeId id) = 0;
  
      //! Get total bytes recv.
      virtual int64_t getTotalBytesRecv() = 0;
  
      //! Get total bytes sent.
      virtual int64_t getTotalBytesSent() = 0;
  
      //! Get mempool size.
      virtual size_t getMempoolSize() = 0;
  
      //! Get mempool dynamic usage.
      virtual size_t getMempoolDynamicUsage() = 0;
  
      //! Get header tip height and time.
      virtual bool getHeaderTip(int& height, int64_t& block_time) = 0;
  
      //! Get num blocks.
      virtual int getNumBlocks() = 0;
  
      //! Get best block hash.
      virtual uint256 getBestBlockHash() = 0;
  
      //! Get last block time.
      virtual int64_t getLastBlockTime() = 0;
  
      //! Get verification progress.
      virtual double getVerificationProgress() = 0;
  
      //! Is initial block download.
      virtual bool isInitialBlockDownload() = 0;
  
      //! Get reindex.
      virtual bool getReindex() = 0;
  
      //! Get importing.
      virtual bool getImporting() = 0;
  
      //! Set network active.
      virtual void setNetworkActive(bool active) = 0;
  
      //! Get network active.
      virtual bool getNetworkActive() = 0;
  
      //! Estimate smart fee.
      virtual CFeeRate estimateSmartFee(int num_blocks, bool conservative, int* returned_target = nullptr) = 0;
  
      //! Get dust relay fee.
      virtual CFeeRate getDustRelayFee() = 0;
  
      //! Execute rpc command.
      virtual UniValue executeRpc(const std::string& command, const UniValue& params, const std::string& uri) = 0;
  
      //! List rpc commands.
      virtual std::vector<std::string> listRpcCommands() = 0;
  
      //! Set RPC timer interface if unset.
      virtual void rpcSetTimerInterfaceIfUnset(RPCTimerInterface* iface) = 0;
  
      //! Unset RPC timer interface.
      virtual void rpcUnsetTimerInterface(RPCTimerInterface* iface) = 0;
  
      //! Get unspent outputs associated with a transaction.
      virtual bool getUnspentOutput(const COutPoint& output, Coin& coin) = 0;
  
      //! Get wallet client.
      virtual WalletClient& walletClient() = 0;
  
      //! Register handler for init messages.
      using InitMessageFn = std::function<void(const std::string& message)>;
      virtual std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) = 0;
  
      //! Register handler for message box messages.
      using MessageBoxFn =
          std::function<bool(const bilingual_str& message, const std::string& caption, unsigned int style)>;
      virtual std::unique_ptr<Handler> handleMessageBox(MessageBoxFn fn) = 0;
  
      //! Register handler for question messages.
      using QuestionFn = std::function<bool(const bilingual_str& message,
          const std::string& non_interactive_message,
          const std::string& caption,
          unsigned int style)>;
      virtual std::unique_ptr<Handler> handleQuestion(QuestionFn fn) = 0;
  
      //! Register handler for progress messages.
      using ShowProgressFn = std::function<void(const std::string& title, int progress, bool resume_possible)>;
      virtual std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) = 0;
  
      //! Register handler for number of connections changed messages.
      using NotifyNumConnectionsChangedFn = std::function<void(int new_num_connections)>;
      virtual std::unique_ptr<Handler> handleNotifyNumConnectionsChanged(NotifyNumConnectionsChangedFn fn) = 0;
  
      //! Register handler for network active messages.
      using NotifyNetworkActiveChangedFn = std::function<void(bool network_active)>;
      virtual std::unique_ptr<Handler> handleNotifyNetworkActiveChanged(NotifyNetworkActiveChangedFn fn) = 0;
  
      //! Register handler for notify alert messages.
      using NotifyAlertChangedFn = std::function<void()>;
      virtual std::unique_ptr<Handler> handleNotifyAlertChanged(NotifyAlertChangedFn fn) = 0;
  
      //! Register handler for ban list messages.
      using BannedListChangedFn = std::function<void()>;
      virtual std::unique_ptr<Handler> handleBannedListChanged(BannedListChangedFn fn) = 0;
  
      //! Register handler for block tip messages.
      using NotifyBlockTipFn =
          std::function<void(SynchronizationState, interfaces::BlockTip tip, double verification_progress)>;
      virtual std::unique_ptr<Handler> handleNotifyBlockTip(NotifyBlockTipFn fn) = 0;
  
      //! Register handler for header tip messages.
      using NotifyHeaderTipFn =
          std::function<void(SynchronizationState, interfaces::BlockTip tip, double verification_progress)>;
      virtual std::unique_ptr<Handler> handleNotifyHeaderTip(NotifyHeaderTipFn fn) = 0;
  
      //! Get and set internal node context. Useful for testing, but not
      //! accessible across processes.
      virtual NodeContext* context() { return nullptr; }
      virtual void setContext(NodeContext* context) { }
  };
  
  //! Return implementation of Node interface.
  std::unique_ptr<Node> MakeNode(NodeContext* context = nullptr);
  
  //! Block tip (could be a header or not, depends on the subscribed signal).
  struct BlockTip {
      int block_height;
      int64_t block_time;
      uint256 block_hash;
  };
  
  } // namespace interfaces
  
  #endif // BITCOIN_INTERFACES_NODE_H
  