audit_logger.h

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// SPDX-License-Identifier: Apache-2.0
#pragma once
 
#include <entropic/storage/audit_entry.h>
#include <entropic/types/config.h>
#include <entropic/types/hooks.h>
 
#include <atomic>
#include <cstddef>
#include <filesystem>
#include <fstream>
#include <mutex>
#include <string>
 
namespace entropic {
 
class AuditLogger {
public:
    explicit AuditLogger(const AuditLogConfig& config);
 
    ~AuditLogger();
 
    AuditLogger(const AuditLogger&) = delete;
    AuditLogger& operator=(const AuditLogger&) = delete;
 
    bool initialize();
 
    void record(const AuditEntry& entry);
 
    void flush();
 
    size_t entry_count() const;
 
    std::filesystem::path log_path() const;
 
    static int hook_callback(
        entropic_hook_point_t hook_point,
        const char* context_json,
        char** modified_json,
        void* user_data);
 
private:
    AuditLogConfig config_;              
    std::atomic<size_t> sequence_{0};    
    std::atomic<size_t> entry_count_{0}; 
    std::mutex write_mutex_;             
    std::ofstream file_;                 
    size_t buffered_count_ = 0;          
    size_t current_file_size_ = 0;       
 
    void write_line(const std::string& line);
 
    static std::string utc_timestamp();
 
    void rotate_if_needed();
 
    void rotate_files();
};
 
} // namespace entropic