logger.h

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// Logs all output to a log file for the run
// Author: Max Schwarz <max.schwarz@uni-bonn.de>

#ifndef LOGGER_H
#define LOGGER_H

#include <memory>
#include <string>

#include "log_event.h"

namespace rosmon
{

class Logger
{
public:
        virtual ~Logger() = default;
        virtual void log(const LogEvent& event) = 0;
};

class FileLogger : public Logger
{
public:
        explicit FileLogger(const std::string& path, bool flush = false);
        ~FileLogger() override;

        void log(const LogEvent& event) override;
private:
        FILE* m_file = nullptr;
        bool m_flush = false;
};

class SyslogLogger : public Logger
{
public:
        explicit SyslogLogger(const std::string& launchFileName);

        void log(const LogEvent& event) override;

private:
        std::string m_tag;
};

class SystemdLogger : public Logger
{
public:
        class NotAvailable : public std::runtime_error
        {
        public:
                NotAvailable(const std::string& msg)
                 : std::runtime_error{msg}
                {}
        };

        explicit SystemdLogger(const std::string& launchFileName);
        ~SystemdLogger() override;

        void log(const LogEvent& event) override;

private:
        std::string m_launchFileName;
        int m_fd = -1;
};

}

#endif