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       1                 :             : // Copyright (c) 2009-2010 Satoshi Nakamoto
       2                 :             : // Copyright (c) 2009-2021 The Bitcoin Core developers
       3                 :             : // Distributed under the MIT software license, see the accompanying
       4                 :             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       5                 :             : 
       6                 :             : #ifndef BITCOIN_NODE_WARNINGS_H
       7                 :             : #define BITCOIN_NODE_WARNINGS_H
       8                 :             : 
       9                 :             : #include <sync.h>
      10                 :             : #include <util/translation.h>
      11                 :             : 
      12                 :             : #include <map>
      13                 :             : #include <variant>
      14                 :             : #include <vector>
      15                 :             : 
      16                 :             : class UniValue;
      17                 :             : 
      18                 :             : namespace kernel {
      19                 :             : enum class Warning;
      20                 :             : } // namespace kernel
      21                 :             : 
      22                 :             : namespace node {
      23                 :             : enum class Warning {
      24                 :             :     CLOCK_OUT_OF_SYNC,
      25                 :             :     PRE_RELEASE_TEST_BUILD,
      26                 :             :     FATAL_INTERNAL_ERROR,
      27                 :             : };
      28                 :             : 
      29                 :             : /**
      30                 :             :  * @class Warnings
      31                 :             :  * @brief Manages warning messages within a node.
      32                 :             :  *
      33                 :             :  * The Warnings class provides mechanisms to set, unset, and retrieve
      34                 :             :  * warning messages. It updates the GUI when warnings are changed.
      35                 :             :  *
      36                 :             :  * This class is designed to be non-copyable to ensure warnings
      37                 :             :  * are managed centrally.
      38                 :             :  */
      39                 :        1750 : class Warnings
      40                 :             : {
      41                 :             :     typedef std::variant<kernel::Warning, node::Warning> warning_type;
      42                 :             : 
      43                 :             :     mutable Mutex m_mutex;
      44                 :             :     std::map<warning_type, bilingual_str> m_warnings GUARDED_BY(m_mutex);
      45                 :             : 
      46                 :             : public:
      47                 :             :     Warnings();
      48                 :             :     //! A warnings instance should always be passed by reference, never copied.
      49                 :             :     Warnings(const Warnings&) = delete;
      50                 :             :     Warnings& operator=(const Warnings&) = delete;
      51                 :             :     /**
      52                 :             :      * @brief Set a warning message. If a warning with the specified
      53                 :             :      *        `id` is already active, false is returned and the new
      54                 :             :      *        warning is ignored. If `id` does not yet exist, the
      55                 :             :      *        warning is set, the UI is updated, and true is returned.
      56                 :             :      *
      57                 :             :      * @param[in]   id  Unique identifier of the warning.
      58                 :             :      * @param[in]   message Warning message to be shown.
      59                 :             :      *
      60                 :             :      * @returns true if the warning was indeed set (i.e. there is no
      61                 :             :      *          active warning with this `id`), otherwise false.
      62                 :             :      */
      63                 :             :     bool Set(warning_type id, bilingual_str message) EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
      64                 :             :     /**
      65                 :             :      * @brief Unset a warning message. If a warning with the specified
      66                 :             :      *        `id` is active, it is unset, the UI is updated, and true
      67                 :             :      *        is returned. Otherwise, no warning is unset and false is
      68                 :             :      *        returned.
      69                 :             :      *
      70                 :             :      * @param[in]   id  Unique identifier of the warning.
      71                 :             :      *
      72                 :             :      * @returns true if the warning was indeed unset (i.e. there is an
      73                 :             :      *          active warning with this `id`), otherwise false.
      74                 :             :      */
      75                 :             :     bool Unset(warning_type id) EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
      76                 :             :     /** Return potential problems detected by the node, sorted by the
      77                 :             :      * warning_type id */
      78                 :             :     std::vector<bilingual_str> GetMessages() const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
      79                 :             : };
      80                 :             : 
      81                 :             : /**
      82                 :             :  * RPC helper function that wraps warnings.GetMessages().
      83                 :             :  *
      84                 :             :  * Returns a UniValue::VSTR with the latest warning if use_deprecated is
      85                 :             :  * set to true, or a UniValue::VARR with all warnings otherwise.
      86                 :             :  */
      87                 :             : UniValue GetWarningsForRpc(const Warnings& warnings, bool use_deprecated);
      88                 :             : } // namespace node
      89                 :             : 
      90                 :             : #endif // BITCOIN_NODE_WARNINGS_H