logger.h

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#ifndef BASE_LOGGER_H
#define BASE_LOGGER_H
 
#include "lock.h"
#include "log.h"
 
#include <atomic>
#include <memory>
#include <string>
#include <vector>
 
typedef void *IOHANDLE;

class CLogMessage
{
public:
    LEVEL m_Level;
    bool m_HaveColor;
    LOG_COLOR m_Color;
    char m_aTimestamp[80];
    char m_aSystem[32];
    char m_aLine[4096];
    int m_TimestampLength;
    int m_SystemLength;
    int m_LineLength;
    int m_LineMessageOffset;

    const char *Message() const
    {
        return m_aLine + m_LineMessageOffset;
    }
};
 
class CLogFilter
{
public:
    std::atomic_int m_MaxLevel{LEVEL_INFO};
 
    bool Filters(const CLogMessage *pMessage);
};
 
class ILogger
{
protected:
    CLogFilter m_Filter;
 
public:
    virtual ~ILogger() = default;

    void SetFilter(const CLogFilter &Filter)
    {
        m_Filter.m_MaxLevel.store(Filter.m_MaxLevel.load(std::memory_order_relaxed), std::memory_order_relaxed);
        OnFilterChange();
    }

    virtual void Log(const CLogMessage *pMessage) = 0;
    virtual void GlobalFinish() {}
    virtual void OnFilterChange() {}
};

void log_set_global_logger(ILogger *logger);

void log_set_global_logger_default();

void log_global_logger_finish();

ILogger *log_get_scope_logger();

void log_set_scope_logger(ILogger *logger);

std::unique_ptr<ILogger> log_logger_android();

std::unique_ptr<ILogger> log_logger_collection(std::vector<std::shared_ptr<ILogger>> &&vpLoggers);

std::unique_ptr<ILogger> log_logger_file(IOHANDLE file);

std::unique_ptr<ILogger> log_logger_stdout();

std::unique_ptr<ILogger> log_logger_windows_debugger();

std::unique_ptr<ILogger> log_logger_noop();

class CFutureLogger : public ILogger
{
private:
    std::shared_ptr<ILogger> m_pLogger;
    std::vector<CLogMessage> m_vPending;
    CLock m_PendingLock;
 
public:
    void Set(std::shared_ptr<ILogger> pLogger) REQUIRES(!m_PendingLock);
    void Log(const CLogMessage *pMessage) override REQUIRES(!m_PendingLock);
    void GlobalFinish() override;
    void OnFilterChange() override;
};

class CMemoryLogger : public ILogger
{
    ILogger *m_pParentLogger = nullptr;
    std::vector<CLogMessage> m_vMessages GUARDED_BY(m_MessagesMutex);
    CLock m_MessagesMutex;
 
public:
    void SetParent(ILogger *pParentLogger) { m_pParentLogger = pParentLogger; }
    void Log(const CLogMessage *pMessage) override REQUIRES(!m_MessagesMutex);
    std::vector<CLogMessage> Lines() REQUIRES(!m_MessagesMutex);
    std::string ConcatenatedLines() REQUIRES(!m_MessagesMutex);
};

class CLogScope
{
    ILogger *old_scope_logger;
    ILogger *new_scope_logger;
 
public:
    CLogScope(ILogger *logger) :
        old_scope_logger(log_get_scope_logger()),
        new_scope_logger(logger)
    {
        log_set_scope_logger(new_scope_logger);
    }
    ~CLogScope()
    {
        log_set_scope_logger(old_scope_logger);
    }
    CLogScope(const CLogScope &) = delete;
};
#endif // BASE_LOGGER_H