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       1                 :             : // Copyright (c) 2023 The Bitcoin Core developers
       2                 :             : // Distributed under the MIT software license, see the accompanying
       3                 :             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4                 :             : 
       5                 :             : #ifndef BITCOIN_KERNEL_NOTIFICATIONS_INTERFACE_H
       6                 :             : #define BITCOIN_KERNEL_NOTIFICATIONS_INTERFACE_H
       7                 :             : 
       8                 :             : #include <cstdint>
       9                 :             : #include <variant>
      10                 :             : 
      11                 :             : class CBlockIndex;
      12                 :             : enum class SynchronizationState;
      13                 :             : struct bilingual_str;
      14                 :             : 
      15                 :             : namespace kernel {
      16                 :             : 
      17                 :             : //! Result type for use with std::variant to indicate that an operation should be interrupted.
      18                 :             : struct Interrupted{};
      19                 :             : enum class Warning;
      20                 :             : 
      21                 :             : 
      22                 :             : //! Simple result type for functions that need to propagate an interrupt status and don't have other return values.
      23                 :             : using InterruptResult = std::variant<std::monostate, Interrupted>;
      24                 :             : 
      25                 :             : template <typename T>
      26                 :        6791 : bool IsInterrupted(const T& result)
      27                 :             : {
      28                 :        6791 :     return std::holds_alternative<kernel::Interrupted>(result);
      29                 :             : }
      30                 :             : 
      31                 :             : /**
      32                 :             :  * A base class defining functions for notifying about certain kernel
      33                 :             :  * events.
      34                 :             :  */
      35                 :             : class Notifications
      36                 :             : {
      37                 :             : public:
      38                 :         586 :     virtual ~Notifications() = default;
      39                 :             : 
      40                 :           0 :     [[nodiscard]] virtual InterruptResult blockTip(SynchronizationState state, CBlockIndex& index) { return {}; }
      41                 :           0 :     virtual void headerTip(SynchronizationState state, int64_t height, int64_t timestamp, bool presync) {}
      42                 :           0 :     virtual void progress(const bilingual_str& title, int progress_percent, bool resume_possible) {}
      43                 :           0 :     virtual void warningSet(Warning id, const bilingual_str& message) {}
      44                 :           0 :     virtual void warningUnset(Warning id) {}
      45                 :             : 
      46                 :             :     //! The flush error notification is sent to notify the user that an error
      47                 :             :     //! occurred while flushing block data to disk. Kernel code may ignore flush
      48                 :             :     //! errors that don't affect the immediate operation it is trying to
      49                 :             :     //! perform. Applications can choose to handle the flush error notification
      50                 :             :     //! by logging the error, or notifying the user, or triggering an early
      51                 :             :     //! shutdown as a precaution against causing more errors.
      52                 :           0 :     virtual void flushError(const bilingual_str& message) {}
      53                 :             : 
      54                 :             :     //! The fatal error notification is sent to notify the user when an error
      55                 :             :     //! occurs in kernel code that can't be recovered from. After this
      56                 :             :     //! notification is sent, whatever function triggered the error should also
      57                 :             :     //! return an error code or raise an exception. Applications can choose to
      58                 :             :     //! handle the fatal error notification by logging the error, or notifying
      59                 :             :     //! the user, or triggering an early shutdown as a precaution against
      60                 :             :     //! causing more errors.
      61                 :           0 :     virtual void fatalError(const bilingual_str& message) {}
      62                 :             : };
      63                 :             : } // namespace kernel
      64                 :             : 
      65                 :             : #endif // BITCOIN_KERNEL_NOTIFICATIONS_INTERFACE_H