Added spdlog logger and added include to cmake

set(CMAKE_EXPORT_COMPILE_COMMANDS 1)

find_package(FUSE REQUIRED)

include_directories(${FUSE_INCLUDE_DIR})

include_directories(${FUSE_INCLUDE_DIR} include/)

set(SOURCE_FILES src/main.cpp src/main.h src/fuse_ops.h)

add_executable(adafs ${SOURCE_FILES} src/main.cpp)

target_link_libraries(adafs ${FUSE_LIBRARIES})

 No newline at end of file

//

// Copyright(c) 2015 Gabi Melman.

// Distributed under the MIT License (http://opensource.org/licenses/MIT)

//

#pragma once

// Very fast asynchronous logger (millions of logs per second on an average desktop)

// Uses pre allocated lockfree queue for maximum throughput even under large number of threads.

// Creates a single back thread to pop messages from the queue and log them.

//

// Upon each log write the logger:

//    1. Checks if its log level is enough to log the message

//    2. Push a new copy of the message to a queue (or block the caller until space is available in the queue)

//    3. will throw spdlog_ex upon log exceptions

// Upon destruction, logs all remaining messages in the queue before destructing..

#include <spdlog/common.h>

#include <spdlog/logger.h>

#include <chrono>

#include <functional>

#include <string>

#include <memory>

namespace spdlog

{

namespace details

{

class async_log_helper;

}

class async_logger :public logger

{

public:

    template<class It>

    async_logger(const std::string& name,

                 const It& begin,

                 const It& end,

                 size_t queue_size,

                 const async_overflow_policy overflow_policy =  async_overflow_policy::block_retry,

                 const std::function<void()>& worker_warmup_cb = nullptr,

                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),

                 const std::function<void()>& worker_teardown_cb = nullptr);

    async_logger(const std::string& logger_name,

                 sinks_init_list sinks,

                 size_t queue_size,

                 const async_overflow_policy overflow_policy = async_overflow_policy::block_retry,

                 const std::function<void()>& worker_warmup_cb = nullptr,

                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),

                 const std::function<void()>& worker_teardown_cb = nullptr);

    async_logger(const std::string& logger_name,

                 sink_ptr single_sink,

                 size_t queue_size,

                 const async_overflow_policy overflow_policy =  async_overflow_policy::block_retry,

                 const std::function<void()>& worker_warmup_cb = nullptr,

                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),

                 const std::function<void()>& worker_teardown_cb = nullptr);

    //Wait for the queue to be empty, and flush synchronously

    //Warning: this can potentialy last forever as we wait it to complete

    void flush() override;

protected:

    void _sink_it(details::log_msg& msg) override;

    void _set_formatter(spdlog::formatter_ptr msg_formatter) override;

    void _set_pattern(const std::string& pattern) override;

private:

    std::unique_ptr<details::async_log_helper> _async_log_helper;

};

}

#include <spdlog/details/async_logger_impl.h>

//

// Copyright(c) 2015 Gabi Melman.

// Distributed under the MIT License (http://opensource.org/licenses/MIT)

//

#pragma once

#include <string>

#include <initializer_list>

#include <chrono>

#include <memory>

#include <atomic>

#include <exception>

#include<functional>

#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)

#include <codecvt>

#include <locale>

#endif

#include <spdlog/details/null_mutex.h>

//visual studio upto 2013 does not support noexcept nor constexpr

#if defined(_MSC_VER) && (_MSC_VER < 1900)

#define SPDLOG_NOEXCEPT throw()

#define SPDLOG_CONSTEXPR

#else

#define SPDLOG_NOEXCEPT noexcept

#define SPDLOG_CONSTEXPR constexpr

#endif

#if defined(__GNUC__)  || defined(__clang__)

#define SPDLOG_DEPRECATED __attribute__((deprecated))

#elif defined(_MSC_VER)

#define SPDLOG_DEPRECATED __declspec(deprecated)

#else

#define SPDLOG_DEPRECATED

#endif

#include <spdlog/fmt/fmt.h>

namespace spdlog

{

class formatter;

namespace sinks

{

class sink;

}

using log_clock = std::chrono::system_clock;

using sink_ptr = std::shared_ptr < sinks::sink >;

using sinks_init_list = std::initializer_list < sink_ptr >;

using formatter_ptr = std::shared_ptr<spdlog::formatter>;

#if defined(SPDLOG_NO_ATOMIC_LEVELS)

using level_t = details::null_atomic_int;

#else

using level_t = std::atomic<int>;

#endif

using log_err_handler = std::function<void(const std::string &err_msg)>;

//Log level enum

namespace level

{

typedef enum

{

    trace = 0,

    debug = 1,

    info = 2,

    warn = 3,

    err = 4,

    critical = 5,

    off = 6

} level_enum;

static const char* level_names[] { "trace", "debug", "info",  "warning", "error", "critical", "off" };

static const char* short_level_names[] { "T", "D", "I", "W", "E", "C", "O" };

inline const char* to_str(spdlog::level::level_enum l)

{

    return level_names[l];

}

inline const char* to_short_str(spdlog::level::level_enum l)

{

    return short_level_names[l];

}

} //level

//

// Async overflow policy - block by default.

//

enum class async_overflow_policy

{

    block_retry, // Block / yield / sleep until message can be enqueued

    discard_log_msg // Discard the message it enqueue fails

};

//

// Log exception

//

namespace details

{

namespace os

{

std::string errno_str(int err_num);

}

}

class spdlog_ex: public std::exception

{

public:

    spdlog_ex(const std::string& msg):_msg(msg)

    {}

    spdlog_ex(const std::string& msg, int last_errno)

    {

        _msg = msg + ": " + details::os::errno_str(last_errno);

    }

    const char* what() const SPDLOG_NOEXCEPT override

    {

        return _msg.c_str();

    }

private:

    std::string _msg;

};

//

// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)

//

#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)

using filename_t = std::wstring;

#else

using filename_t = std::string;

#endif

} //spdlog

//

// Copyright(c) 2015 Gabi Melman.

// Distributed under the MIT License (http://opensource.org/licenses/MIT)

//

// async log helper :

// Process logs asynchronously using a back thread.

//

// If the internal queue of log messages reaches its max size,

// then the client call will block until there is more room.

//

// If the back thread throws during logging, a spdlog::spdlog_ex exception

// will be thrown in client's thread when tries to log the next message

#pragma once

#include <spdlog/common.h>

#include <spdlog/sinks/sink.h>

#include <spdlog/details/mpmc_bounded_q.h>

#include <spdlog/details/log_msg.h>

#include <spdlog/details/os.h>

#include <spdlog/formatter.h>

#include <chrono>

#include <exception>

#include <functional>

#include <memory>

#include <string>

#include <thread>

#include <utility>

#include <vector>

namespace spdlog

{

namespace details

{

class async_log_helper

{

    // Async msg to move to/from the queue

    // Movable only. should never be copied

    enum class async_msg_type

    {

        log,

        flush,

        terminate

    };

    struct async_msg

    {

        std::string logger_name;

        level::level_enum level;

        log_clock::time_point time;

        size_t thread_id;

        std::string txt;

        async_msg_type msg_type;

        async_msg() = default;

        ~async_msg() = default;

async_msg(async_msg&& other) SPDLOG_NOEXCEPT:

        logger_name(std::move(other.logger_name)),

                    level(std::move(other.level)),

                    time(std::move(other.time)),

                    txt(std::move(other.txt)),

                    msg_type(std::move(other.msg_type))

        {}

        async_msg(async_msg_type m_type) :msg_type(m_type)

        {}

        async_msg& operator=(async_msg&& other) SPDLOG_NOEXCEPT

        {

            logger_name = std::move(other.logger_name);

            level = other.level;

            time = std::move(other.time);

            thread_id = other.thread_id;

            txt = std::move(other.txt);

            msg_type = other.msg_type;

            return *this;

        }

        // never copy or assign. should only be moved..

        async_msg(const async_msg&) = delete;

        async_msg& operator=(const async_msg& other) = delete;

        // construct from log_msg

        async_msg(const details::log_msg& m) :

            level(m.level),

            time(m.time),

            thread_id(m.thread_id),

            txt(m.raw.data(), m.raw.size()),

            msg_type(async_msg_type::log)

        {

#ifndef SPDLOG_NO_NAME

            logger_name = *m.logger_name;

#endif

        }

        // copy into log_msg

        void fill_log_msg(log_msg &msg)

        {

            msg.logger_name = &logger_name;

            msg.level = level;

            msg.time = time;

            msg.thread_id = thread_id;

            msg.raw << txt;

        }

    };

public:

    using item_type = async_msg;

    using q_type = details::mpmc_bounded_queue<item_type>;

    using clock = std::chrono::steady_clock;

    async_log_helper(formatter_ptr formatter,

                     const std::vector<sink_ptr>& sinks,

                     size_t queue_size,

                     const log_err_handler err_handler,

                     const async_overflow_policy overflow_policy = async_overflow_policy::block_retry,

                     const std::function<void()>& worker_warmup_cb = nullptr,

                     const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),

                     const std::function<void()>& worker_teardown_cb = nullptr);

    void log(const details::log_msg& msg);

    // stop logging and join the back thread

    ~async_log_helper();

    void set_formatter(formatter_ptr);

    void flush(bool wait_for_q);

private:

    formatter_ptr _formatter;

    std::vector<std::shared_ptr<sinks::sink>> _sinks;

    // queue of messages to log

    q_type _q;

    log_err_handler _err_handler;

    bool _flush_requested;

    bool _terminate_requested;

    // overflow policy

    const async_overflow_policy _overflow_policy;

    // worker thread warmup callback - one can set thread priority, affinity, etc

    const std::function<void()> _worker_warmup_cb;

    // auto periodic sink flush parameter

    const std::chrono::milliseconds _flush_interval_ms;

    // worker thread teardown callback

    const std::function<void()> _worker_teardown_cb;

    // worker thread

    std::thread _worker_thread;

    void push_msg(async_msg&& new_msg);

    // worker thread main loop

    void worker_loop();

    // pop next message from the queue and process it. will set the last_pop to the pop time

    // return false if termination of the queue is required

    bool process_next_msg(log_clock::time_point& last_pop, log_clock::time_point& last_flush);

    void handle_flush_interval(log_clock::time_point& now, log_clock::time_point& last_flush);

    // sleep,yield or return immediatly using the time passed since last message as a hint

    static void sleep_or_yield(const spdlog::log_clock::time_point& now, const log_clock::time_point& last_op_time);

    // wait until the queue is empty

    void wait_empty_q();

};

}

}

///////////////////////////////////////////////////////////////////////////////

// async_sink class implementation

///////////////////////////////////////////////////////////////////////////////

inline spdlog::details::async_log_helper::async_log_helper(

    formatter_ptr formatter,

    const std::vector<sink_ptr>& sinks,

    size_t queue_size,

    log_err_handler err_handler,

    const async_overflow_policy overflow_policy,

    const std::function<void()>& worker_warmup_cb,

    const std::chrono::milliseconds& flush_interval_ms,

    const std::function<void()>& worker_teardown_cb):

    _formatter(formatter),

    _sinks(sinks),

    _q(queue_size),

    _err_handler(err_handler),

    _flush_requested(false),

    _terminate_requested(false),

    _overflow_policy(overflow_policy),

    _worker_warmup_cb(worker_warmup_cb),

    _flush_interval_ms(flush_interval_ms),

    _worker_teardown_cb(worker_teardown_cb),

    _worker_thread(&async_log_helper::worker_loop, this)

{}

// Send to the worker thread termination message(level=off)

// and wait for it to finish gracefully

inline spdlog::details::async_log_helper::~async_log_helper()

{

    try

    {

        push_msg(async_msg(async_msg_type::terminate));

        _worker_thread.join();

    }

    catch (...) // don't crash in destructor

    {}

}

//Try to push and block until succeeded (if the policy is not to discard when the queue is full)

inline void spdlog::details::async_log_helper::log(const details::log_msg& msg)

{

    push_msg(async_msg(msg));

}

inline void spdlog::details::async_log_helper::push_msg(details::async_log_helper::async_msg&& new_msg)

{

    if (!_q.enqueue(std::move(new_msg)) && _overflow_policy != async_overflow_policy::discard_log_msg)

    {

        auto last_op_time = details::os::now();

        auto now = last_op_time;

        do

        {

            now = details::os::now();

            sleep_or_yield(now, last_op_time);

        }

        while (!_q.enqueue(std::move(new_msg)));

    }

}

// optionally wait for the queue be empty and request flush from the sinks

inline void spdlog::details::async_log_helper::flush(bool wait_for_q)

{

    push_msg(async_msg(async_msg_type::flush));

    if(wait_for_q)

        wait_empty_q(); //return only make after the above flush message was processed

}

inline void spdlog::details::async_log_helper::worker_loop()

{

    try

    {

        if (_worker_warmup_cb) _worker_warmup_cb();

        auto last_pop = details::os::now();

        auto last_flush = last_pop;

        while(process_next_msg(last_pop, last_flush));

        if (_worker_teardown_cb) _worker_teardown_cb();

    }

    catch (const std::exception &ex)

    {

        _err_handler(ex.what());

    }

    catch (...)

    {

        _err_handler("Unknown exception");

    }

}

// process next message in the queue

// return true if this thread should still be active (while no terminate msg was received)

inline bool spdlog::details::async_log_helper::process_next_msg(log_clock::time_point& last_pop, log_clock::time_point& last_flush)

{

    async_msg incoming_async_msg;

    if (_q.dequeue(incoming_async_msg))

    {

        last_pop = details::os::now();

        switch (incoming_async_msg.msg_type)

        {

        case async_msg_type::flush:

            _flush_requested = true;

            break;

        case async_msg_type::terminate:

            _flush_requested = true;

            _terminate_requested = true;

            break;

        default:

            log_msg incoming_log_msg;

            incoming_async_msg.fill_log_msg(incoming_log_msg);

            _formatter->format(incoming_log_msg);

            for (auto &s : _sinks)

            {

                if(s->should_log( incoming_log_msg.level))

                {

                    s->log(incoming_log_msg);

                }

            }

        }

        return true;

    }

    // Handle empty queue..

    // This is the only place where the queue can terminate or flush to avoid losing messages already in the queue

    else

    {

        auto now = details::os::now();

        handle_flush_interval(now, last_flush);

        sleep_or_yield(now, last_pop);

        return !_terminate_requested;

    }

}

// flush all sinks if _flush_interval_ms has expired

inline void spdlog::details::async_log_helper::handle_flush_interval(log_clock::time_point& now, log_clock::time_point& last_flush)

{

    auto should_flush = _flush_requested || (_flush_interval_ms != std::chrono::milliseconds::zero() && now - last_flush >= _flush_interval_ms);

    if (should_flush)

    {

        for (auto &s : _sinks)

            s->flush();

        now = last_flush = details::os::now();

        _flush_requested = false;

    }

}

inline void spdlog::details::async_log_helper::set_formatter(formatter_ptr msg_formatter)

{

    _formatter = msg_formatter;

}

// spin, yield or sleep. use the time passed since last message as a hint

inline void spdlog::details::async_log_helper::sleep_or_yield(const spdlog::log_clock::time_point& now, const spdlog::log_clock::time_point& last_op_time)

{

    using namespace std::this_thread;

    using std::chrono::milliseconds;

    using std::chrono::microseconds;

    auto time_since_op = now - last_op_time;

    // spin upto 50 micros

    if (time_since_op <= microseconds(50))

        return;

    // yield upto 150 micros

    if (time_since_op <= microseconds(100))

        return std::this_thread::yield();

    // sleep for 20 ms upto 200 ms

    if (time_since_op <= milliseconds(200))

        return sleep_for(milliseconds(20));

    // sleep for 200 ms

    return sleep_for(milliseconds(200));

}

// wait for the queue to be empty

inline void spdlog::details::async_log_helper::wait_empty_q()

{

    auto last_op = details::os::now();

    while (_q.approx_size() > 0)

    {

        sleep_or_yield(details::os::now(), last_op);

    }

}

//

// Copyright(c) 2015 Gabi Melman.

// Distributed under the MIT License (http://opensource.org/licenses/MIT)

//

#pragma once

// Async Logger implementation

// Use an async_sink (queue per logger) to perform the logging in a worker thread

#include <spdlog/details/async_log_helper.h>

#include <spdlog/async_logger.h>

#include <string>

#include <functional>

#include <chrono>

#include <memory>

template<class It>

inline spdlog::async_logger::async_logger(const std::string& logger_name,

        const It& begin,

        const It& end,

        size_t queue_size,

        const  async_overflow_policy overflow_policy,

        const std::function<void()>& worker_warmup_cb,

        const std::chrono::milliseconds& flush_interval_ms,

        const std::function<void()>& worker_teardown_cb) :

    logger(logger_name, begin, end),

    _async_log_helper(new details::async_log_helper(_formatter, _sinks, queue_size, _err_handler, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb))

{

}

inline spdlog::async_logger::async_logger(const std::string& logger_name,

        sinks_init_list sinks_list,

        size_t queue_size,

        const  async_overflow_policy overflow_policy,

        const std::function<void()>& worker_warmup_cb,

        const std::chrono::milliseconds& flush_interval_ms,

        const std::function<void()>& worker_teardown_cb) :

    async_logger(logger_name, sinks_list.begin(), sinks_list.end(), queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb) {}

inline spdlog::async_logger::async_logger(const std::string& logger_name,

        sink_ptr single_sink,

        size_t queue_size,

        const  async_overflow_policy overflow_policy,

        const std::function<void()>& worker_warmup_cb,

        const std::chrono::milliseconds& flush_interval_ms,

        const std::function<void()>& worker_teardown_cb) :

    async_logger(logger_name,

{

    single_sink

}, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb) {}

inline void spdlog::async_logger::flush()

{

    _async_log_helper->flush(true);

}

inline void spdlog::async_logger::_set_formatter(spdlog::formatter_ptr msg_formatter)

{

    _formatter = msg_formatter;

    _async_log_helper->set_formatter(_formatter);

}

inline void spdlog::async_logger::_set_pattern(const std::string& pattern)

{

    _formatter = std::make_shared<pattern_formatter>(pattern);

    _async_log_helper->set_formatter(_formatter);

}

inline void spdlog::async_logger::_sink_it(details::log_msg& msg)

{

    try

    {

        _async_log_helper->log(msg);

        if (_should_flush_on(msg))

            _async_log_helper->flush(false); // do async flush

    }

    catch (const std::exception &ex)

    {

        _err_handler(ex.what());

    }

    catch (...)

    {

        _err_handler("Unknown exception");

    }

}