BLT/src/blt/profiling/profiler.cpp

/*
 * Created by Brett on 23/12/22.
 * Licensed under GNU General Public License V3.0
 * See LICENSE file for license detail
 */
#include <blt/profiling/profiler.h>
#include <mutex>
#include <vector>
#include <blt/std/time.h>
#include <blt/std/logging.h>
#include <iostream>
#include <algorithm>
#include <blt/std/format.h>

namespace blt::profiling {
    
    // TODO: a better way
    std::mutex profileLock{};
    std::unordered_map<std::string, Profile> profiles;
    
    void startInterval(const std::string& profileName, const std::string& intervalName) {
        std::scoped_lock lock(profileLock);
        CaptureInterval interval{};
        interval.start = System::getCurrentTimeNanoseconds();
        profiles[profileName].intervals[intervalName] = interval;
    }
    
    void endInterval(const std::string& profileName, const std::string& intervalName) {
        std::scoped_lock lock(profileLock);
        profiles[profileName].intervals[intervalName].end = System::getCurrentTimeNanoseconds();
    }
    
    void point(const std::string& profileName, const std::string& pointName) {
        std::scoped_lock lock(profileLock);
        CapturePoint point{};
        point.point = System::getCurrentTimeNanoseconds();
        point.name = pointName;
        profiles[profileName].points.push(point);
    }
    
    CaptureInterval getInterval(const std::string& profileName, const std::string& intervalName) {
        return profiles[profileName].intervals[intervalName];
    }
    
    Profile getProfile(const std::string& profileName) {
        return profiles[profileName];
    }
    
    inline void print(const std::vector<std::string>& lines, int level) {
        if (level < 0) {
            for (const auto& line : lines)
                std::cout << line;
        } else {
            auto& logger = logging::loggerLevelDecode[level];
            for (const auto& line : lines)
                logger << line;
        }
    }
    
    void printProfile(const std::string& profileName, int loggingLevel) {
        string::TableFormatter formatter {profileName};
        formatter.addColumn({"Interval"});
        formatter.addColumn({"Time (ns)"});
        formatter.addColumn({"Time (ms)"});
    
        const auto& profile = profiles[profileName];
        const auto& intervals = profile.intervals;
        const auto& points = profile.points;
        
        for (const auto& interval : intervals) {
            const auto difference = interval.second.end - interval.second.start;
            formatter.addRow({interval.first, std::to_string(difference), std::to_string((double)difference/1000000.0)});
        }
        
        std::vector<std::string> updatedLines;
        const auto& lines = formatter.createTable(true, true);
        for (const auto& line : lines)
            updatedLines.emplace_back(line + "\n");
        
        print(updatedLines, loggingLevel);
    }
    
    struct timeOrderContainer {
        long difference;
        std::string name;
        
        timeOrderContainer(long difference, std::string name): difference(difference), name(std::move(name)) {}
    };
    
    inline bool timeCompare(const timeOrderContainer& container1, const timeOrderContainer& container2) {
        return container1.difference < container2.difference;
    }
    
    void printOrderedProfile(const std::string& profileName, int loggingLevel) {
        const auto& profile = profiles[profileName];
        const auto& intervals = profile.intervals;
        const auto& points = profile.points;
    
        std::vector<timeOrderContainer> unorderedIntervalVector;
    
        for (const auto& interval : intervals) {
            const auto difference = interval.second.end - interval.second.start;
            unorderedIntervalVector.emplace_back(difference, interval.first);
        }
    
        std::sort(unorderedIntervalVector.begin(), unorderedIntervalVector.end(), timeCompare);
    
        string::TableFormatter formatter {profileName};
        formatter.addColumn({"Order"});
        formatter.addColumn({"Interval"});
        formatter.addColumn({"Time (ns)"});
        formatter.addColumn({"Time (ms)"});
    
        int index = 1;
        for (const auto& interval : unorderedIntervalVector) {
            formatter.addRow({std::to_string(index++), interval.name, std::to_string(interval.difference), std::to_string(interval.difference / 1000000.0)});
        }
    
        std::vector<std::string> updatedLines;
        const auto& lines = formatter.createTable(true, true);
        for (const auto& line : lines)
            updatedLines.emplace_back(line + "\n");
    
        print(updatedLines, loggingLevel);
    }
    
    void discardProfiles() {
        profiles = {};
    }
    
    void discardIntervals(const std::string& profileName) {
        profiles[profileName].intervals = {};
    }
    
    void discardPoints(const std::string& profileName) {
        profiles[profileName].points = {};
    }
}