vtkLogger.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkLogger_h
#define vtkLogger_h
 
#include "vtkObjectBase.h"
#include "vtkSetGet.h" // needed for macros
 
#include <string> // needed for std::string
 
#if defined(_MSC_VER)
#include <sal.h> // Needed for _In_z_ etc annotations
#endif
 
// this is copied from `loguru.hpp`
#if defined(__clang__) || defined(__GNUC__)
// Helper macro for declaring functions as having similar signature to printf.
// This allows the compiler to catch format errors at compile-time.
#define VTK_PRINTF_LIKE(fmtarg, firstvararg)                                                       \
  __attribute__((__format__(__printf__, fmtarg, firstvararg)))
#define VTK_FORMAT_STRING_TYPE const char*
#elif defined(_MSC_VER)
#define VTK_PRINTF_LIKE(fmtarg, firstvararg)
#define VTK_FORMAT_STRING_TYPE _In_z_ _Printf_format_string_ const char*
#else
#define VTK_PRINTF_LIKE(fmtarg, firstvararg)
#define VTK_FORMAT_STRING_TYPE const char*
#endif
 
VTK_ABI_NAMESPACE_BEGIN
class VTKCOMMONCORE_EXPORT vtkLogger : public vtkObjectBase
{
public:
  vtkBaseTypeMacro(vtkLogger, vtkObjectBase);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  enum Verbosity
  {
    // Used to mark an invalid verbosity. Do not log to this level.
    VERBOSITY_INVALID = -10, // Never do LOG_F(INVALID)
 
    // You may use VERBOSITY_OFF on g_stderr_verbosity, but for nothing else!
    VERBOSITY_OFF = -9, // Never do LOG_F(OFF)
 
    VERBOSITY_ERROR = -2,
    VERBOSITY_WARNING = -1,
 
    // Normal messages. By default written to stderr.
    VERBOSITY_INFO = 0,
 
    // Same as VERBOSITY_INFO in every way.
    VERBOSITY_0 = 0,
 
    // Verbosity levels 1-9 are generally not written to stderr, but are written to file.
    VERBOSITY_1 = +1,
    VERBOSITY_2 = +2,
    VERBOSITY_3 = +3,
    VERBOSITY_4 = +4,
    VERBOSITY_5 = +5,
    VERBOSITY_6 = +6,
    VERBOSITY_7 = +7,
    VERBOSITY_8 = +8,
    VERBOSITY_9 = +9,
 
    // trace level, same as VERBOSITY_9
    VERBOSITY_TRACE = +9,
 
    // Don not use higher verbosity levels, as that will make grepping log files harder.
    VERBOSITY_MAX = +9,
  };
 
  static void Init(int& argc, char* argv[], const char* verbosity_flag = "-v");
  static void Init();
  static void SetStderrVerbosity(Verbosity level);
 
  static void SetInternalVerbosityLevel(Verbosity level);
 
  enum FileMode
  {
    TRUNCATE,
    APPEND
  };
 
  static void LogToFile(const char* path, FileMode filemode, Verbosity verbosity);
 
  static void EndLogToFile(const char* path);
 
 
  static void SetThreadName(const std::string& name);
  static std::string GetThreadName();
 
  static std::string GetIdentifier(vtkObjectBase* obj);
 
  struct Message
  {
    // You would generally print a Message by just concatenating the buffers without spacing.
    // Optionally, ignore preamble and indentation.
    Verbosity verbosity;     // Already part of preamble
    const char* filename;    // Already part of preamble
    unsigned line;           // Already part of preamble
    const char* preamble;    // Date, time, uptime, thread, file:line, verbosity.
    const char* indentation; // Just a bunch of spacing.
    const char* prefix;      // Assertion failure info goes here (or "").
    const char* message;     // User message goes here.
  };
 
 
  using LogHandlerCallbackT = void (*)(void* user_data, const Message& message);
  using CloseHandlerCallbackT = void (*)(void* user_data);
  using FlushHandlerCallbackT = void (*)(void* user_data);
 
  static void AddCallback(const char* id, LogHandlerCallbackT callback, void* user_data,
    Verbosity verbosity, CloseHandlerCallbackT on_close = nullptr,
    FlushHandlerCallbackT on_flush = nullptr);
 
  static bool RemoveCallback(const char* id);
 
  static bool IsEnabled();
 
  static Verbosity GetCurrentVerbosityCutoff();
 
  static Verbosity ConvertToVerbosity(int value);
 
  static Verbosity ConvertToVerbosity(const char* text);
 
 
  static void Log(
    Verbosity verbosity, VTK_FILEPATH const char* fname, unsigned int lineno, const char* txt);
  static void StartScope(
    Verbosity verbosity, const char* id, VTK_FILEPATH const char* fname, unsigned int lineno);
  static void EndScope(const char* id);
#if !defined(__WRAP__)
  static void LogF(Verbosity verbosity, VTK_FILEPATH const char* fname, unsigned int lineno,
    VTK_FORMAT_STRING_TYPE format, ...) VTK_PRINTF_LIKE(4, 5);
  static void StartScopeF(Verbosity verbosity, const char* id, VTK_FILEPATH const char* fname,
    unsigned int lineno, VTK_FORMAT_STRING_TYPE format, ...) VTK_PRINTF_LIKE(5, 6);
 
  class VTKCOMMONCORE_EXPORT LogScopeRAII
  {
  public:
    LogScopeRAII();
    LogScopeRAII(vtkLogger::Verbosity verbosity, const char* fname, unsigned int lineno,
      VTK_FORMAT_STRING_TYPE format, ...) VTK_PRINTF_LIKE(5, 6);
    ~LogScopeRAII();
#if defined(_MSC_VER) && _MSC_VER > 1800
    // see loguru.hpp for the reason why this is needed on MSVC
    LogScopeRAII(LogScopeRAII&& other)
      : Internals(other.Internals)
    {
      other.Internals = nullptr;
    }
#else
    LogScopeRAII(LogScopeRAII&&) = default;
#endif
 
  private:
    LogScopeRAII(const LogScopeRAII&) = delete;
    void operator=(const LogScopeRAII&) = delete;
    class LSInternals;
    LSInternals* Internals;
  };
#endif
 
  static bool EnableUnsafeSignalHandler;
 
protected:
  vtkLogger();
  ~vtkLogger() override;
 
private:
  vtkLogger(const vtkLogger&) = delete;
  void operator=(const vtkLogger&) = delete;
  static vtkLogger::Verbosity InternalVerbosityLevel;
};
 
 
#define vtkVLogF(level, ...)                                                                       \
  ((level) > vtkLogger::GetCurrentVerbosityCutoff())                                               \
    ? (void)0                                                                                      \
    : vtkLogger::LogF(level, __FILE__, __LINE__, __VA_ARGS__)
#define vtkLogF(verbosity_name, ...) vtkVLogF(vtkLogger::VERBOSITY_##verbosity_name, __VA_ARGS__)
#define vtkVLog(level, x)                                                                          \
  if ((level) <= vtkLogger::GetCurrentVerbosityCutoff())                                           \
  {                                                                                                \
    vtkOStrStreamWrapper::EndlType const endl;                                                     \
    vtkOStrStreamWrapper::UseEndl(endl);                                                           \
    vtkOStrStreamWrapper vtkmsg;                                                                   \
    vtkmsg << "" x;                                                                                \
    vtkLogger::Log(level, __FILE__, __LINE__, vtkmsg.str());                                       \
    vtkmsg.rdbuf()->freeze(0);                                                                     \
  }
#define vtkLog(verbosity_name, x) vtkVLog(vtkLogger::VERBOSITY_##verbosity_name, x)
 
 
#define vtkVLogIfF(level, cond, ...)                                                               \
  ((level) > vtkLogger::GetCurrentVerbosityCutoff() || (cond) == false)                            \
    ? (void)0                                                                                      \
    : vtkLogger::LogF(level, __FILE__, __LINE__, __VA_ARGS__)
 
#define vtkLogIfF(verbosity_name, cond, ...)                                                       \
  vtkVLogIfF(vtkLogger::VERBOSITY_##verbosity_name, cond, __VA_ARGS__)
 
#define vtkVLogIf(level, cond, x)                                                                  \
  if ((level) <= vtkLogger::GetCurrentVerbosityCutoff() && (cond))                                 \
  {                                                                                                \
    vtkOStrStreamWrapper::EndlType endl;                                                           \
    vtkOStrStreamWrapper::UseEndl(endl);                                                           \
    vtkOStrStreamWrapper vtkmsg;                                                                   \
    vtkmsg << "" x;                                                                                \
    vtkLogger::Log(level, __FILE__, __LINE__, vtkmsg.str());                                       \
    vtkmsg.rdbuf()->freeze(0);                                                                     \
  }
#define vtkLogIf(verbosity_name, cond, x) vtkVLogIf(vtkLogger::VERBOSITY_##verbosity_name, cond, x)
 
#define VTKLOG_CONCAT_IMPL(s1, s2) s1##s2
#define VTKLOG_CONCAT(s1, s2) VTKLOG_CONCAT_IMPL(s1, s2)
#define VTKLOG_ANONYMOUS_VARIABLE(x) VTKLOG_CONCAT(x, __LINE__)
 
#define vtkVLogScopeF(level, ...)                                                                  \
  auto VTKLOG_ANONYMOUS_VARIABLE(msg_context) = ((level) > vtkLogger::GetCurrentVerbosityCutoff()) \
    ? vtkLogger::LogScopeRAII()                                                                    \
    : vtkLogger::LogScopeRAII(level, __FILE__, __LINE__, __VA_ARGS__)
 
#define vtkLogScopeF(verbosity_name, ...)                                                          \
  vtkVLogScopeF(vtkLogger::VERBOSITY_##verbosity_name, __VA_ARGS__)
 
#define vtkLogScopeFunction(verbosity_name) vtkLogScopeF(verbosity_name, "%s", __func__)
#define vtkVLogScopeFunction(level) vtkVLogScopeF(level, "%s", __func__)
 
 
#define vtkLogStartScope(verbosity_name, id)                                                       \
  vtkLogger::StartScope(vtkLogger::VERBOSITY_##verbosity_name, id, __FILE__, __LINE__)
#define vtkLogEndScope(id) vtkLogger::EndScope(id)
 
#define vtkLogStartScopeF(verbosity_name, id, ...)                                                 \
  vtkLogger::StartScopeF(vtkLogger::VERBOSITY_##verbosity_name, id, __FILE__, __LINE__, __VA_ARGS__)
 
#define vtkVLogStartScope(level, id) vtkLogger::StartScope(level, id, __FILE__, __LINE__)
#define vtkVLogStartScopeF(level, id, ...)                                                         \
  vtkLogger::StartScopeF(level, id, __FILE__, __LINE__, __VA_ARGS__)
 
#define vtkLogIdentifier(vtkobject) vtkLogger::GetIdentifier(vtkobject).c_str()
 
VTK_ABI_NAMESPACE_END
#endif