Skip to content

backend-strategy.md

Latest commit

 

History

History
588 lines (503 loc) · 13.2 KB

backend-strategy.md

File metadata and controls

588 lines (503 loc) · 13.2 KB
Raw

🚀 BACKEND STRATEGY FOR 3D ASSEMBLY SYSTEM

📊 NoSQL DATABASE DESIGN (MongoDB)

Collection: assemblies

{
  _id: ObjectId,
  metadata: {
    name: "Octahedron Assembly",
    version: "2.0",
    created: ISODate,
    lastModified: ISODate,
    author: ObjectId, // Reference to users
    description: "Optimized octahedron assembly...",
    difficulty: "intermediate",
    estimatedTime: 1800,
    tags: ["geometry", "3d", "stem"],
    category: "geometric-shapes",
    featured: false
  },
  
  // Template-based architecture
  templates: {
    materials: [
      {id: "plastic_green", source: "/templates/materials/plastic_green.json"},
      {id: "plastic_red", source: "/templates/materials/plastic_red.json"}
    ],
    components: [
      {id: "green_11_2", source: "/templates/straws/green_11_2.json"},
      {id: "3leg_red", source: "/templates/connectors/3leg_red.json"}
    ]
  },
  
  // Optimized instances
  instances: {
    straws: [
      {
        templateId: "green_11_2",
        instances: [
          {id: "straw_1", transform: {position: {x:0,y:0,z:0}, rotation: {x:0,y:0,z:0}}}
        ]
      }
    ],
    connectors: [
      {
        templateId: "3leg_red", 
        instances: [
          {id: "conn_1", transform: {position: {x:0,y:0,z:0}, rotation: {x:0,y:0,z:0}}}
        ]
      }
    ]
  },
  
  // Connection definitions
  connections: {
    "base_square": [
      {strawId: "straw_1", endpoint: "start", connectorId: "conn_1", port: 0}
    ]
  },
  
  // Interactive actions
  actions: [
    {
      id: "action_1",
      name: "Build Base",
      type: "connect",
      targets: ["straw_1", "conn_1"],
      duration: 2.0,
      validation: {type: "connection", criteria: {}}
    }
  ],
  
  // Learning activities
  activities: [
    {
      id: "activity_1",
      name: "Octahedron Lab",
      objectives: ["Understand geometry", "Practice construction"],
      steps: [
        {actionId: "action_1", title: "Build Base", hints: ["Use connectors"]}
      ]
    }
  ],
  
  // Performance data
  performance: {
    compressionRatio: "5.4:1",
    originalSize: 1616,
    optimizedSize: 300,
    loadTime: 0.8, // seconds
    targetFPS: 60
  },
  
  // Access control
  permissions: {
    isPublic: true,
    allowedRoles: ["student", "teacher"],
    restrictedFeatures: []
  },
  
  // Indexing for search
  searchKeywords: ["octahedron", "geometry", "3d", "assembly"],
  
  // Analytics
  analytics: {
    viewCount: 1250,
    completionRate: 0.87,
    averageTime: 1650,
    difficultyRating: 3.2
  }
}

Collection: component_templates

{
  _id: ObjectId,
  templateId: "green_11_2", // Unique identifier
  name: "Green Straw 11.2cm",
  category: "straw",
  type: "cylindrical",
  
  // Physical properties
  geometry: {
    length: 11.2,
    diameter: 0.6,
    wallThickness: 0.1
  },
  
  material: {
    type: "plastic",
    color: "#c1e500",
    flexibility: 75,
    opacity: 1.0,
    roughness: 0.3
  },
  
  // 3D model data
  model: {
    url: "/models/straws/green_straw.glb",
    size: 15840, // bytes
    format: "glb",
    compressionLevel: 7
  },
  
  // LOD configurations
  lod: {
    high: {
      geometryComplexity: "detailed",
      polyCount: 128,
      textureResolution: 512
    },
    medium: {
      geometryComplexity: "standard", 
      polyCount: 64,
      textureResolution: 256
    },
    low: {
      geometryComplexity: "basic",
      polyCount: 16,
      textureResolution: 128
    }
  },
  
  // Physics properties
  physics: {
    mass: 0.05,
    friction: 0.4,
    elasticity: 0.2
  },
  
  // Connection points
  endpoints: {
    start: {localPosition: {x: 0, y: -5.6, z: 0}},
    end: {localPosition: {x: 0, y: 5.6, z: 0}}
  },
  
  // Version control
  version: "1.2",
  created: ISODate,
  lastModified: ISODate,
  
  // Usage statistics
  usage: {
    usedInAssemblies: 45,
    popularityScore: 8.7
  }
}

Collection: user_progress

{
  _id: ObjectId,
  userId: ObjectId,
  assemblyId: ObjectId,
  
  // Progress tracking
  progress: {
    currentStep: 3,
    totalSteps: 5,
    completedSteps: [1, 2],
    startedAt: ISODate,
    lastActiveAt: ISODate,
    estimatedCompletion: ISODate
  },
  
  // Performance metrics
  metrics: {
    timeSpent: 1200, // seconds
    hintsUsed: 2,
    errorsCount: 1,
    retryCount: 0,
    efficiencyScore: 0.85
  },
  
  // Step-by-step details
  stepHistory: [
    {
      stepId: 1,
      actionId: "action_prepare_connectors",
      startTime: ISODate,
      endTime: ISODate,
      duration: 45,
      attempts: 1,
      hintsUsed: 0,
      success: true
    }
  ],
  
  // Real-time performance data
  performanceData: {
    avgFPS: 58.4,
    memoryUsage: 125, // MB
    deviceSpecs: {
      browser: "Chrome 120",
      gpu: "RTX 3060",
      ram: "16GB"
    }
  },
  
  // Learning analytics
  learningMetrics: {
    conceptsLearned: ["geometric-symmetry", "3d-construction"],
    skillsImproved: ["spatial-reasoning", "problem-solving"],
    difficultyAdaptation: "increasing"
  }
}

Collection: performance_analytics

{
  _id: ObjectId,
  assemblyId: ObjectId,
  
  // Aggregated performance data
  performance: {
    averageLoadTime: 0.75,
    averageFPS: 59.2,
    averageMemoryUsage: 118,
    compressionEfficiency: 0.847
  },
  
  // Device compatibility
  deviceMetrics: {
    "mobile": {avgFPS: 45.2, loadTime: 1.2},
    "desktop": {avgFPS: 59.8, loadTime: 0.6},
    "tablet": {avgFPS: 52.1, loadTime: 0.9}
  },
  
  // Geographic distribution
  regionPerformance: {
    "asia": {avgLoadTime: 0.65, cdnHitRate: 0.92},
    "europe": {avgLoadTime: 0.71, cdnHitRate: 0.89},
    "america": {avgLoadTime: 0.68, cdnHitRate: 0.94}
  },
  
  // Optimization recommendations
  recommendations: [
    {
      type: "lod_adjustment",
      description: "Reduce LOD distance for mobile devices",
      impact: "15% FPS improvement",
      priority: "high"
    }
  ],
  
  lastUpdated: ISODate
}

🏗️ MICROSERVICE DETAILED DESIGN

1. Assembly Management Service (AMS)

Technologies: Node.js + Express/Fastify + MongoDB Responsibilities:

  • Assembly CRUD operations
  • Template validation & compilation
  • Real-time collaboration
  • Version control

API Endpoints:

// RESTful APIs
GET    /api/v1/assemblies                    // List assemblies
GET    /api/v1/assemblies/:id                // Get assembly
POST   /api/v1/assemblies                    // Create assembly
PUT    /api/v1/assemblies/:id                // Update assembly
DELETE /api/v1/assemblies/:id                // Delete assembly

// Advanced endpoints
POST   /api/v1/assemblies/:id/optimize       // Optimize assembly
POST   /api/v1/assemblies/:id/validate       // Validate structure
GET    /api/v1/assemblies/:id/performance    // Performance metrics
POST   /api/v1/assemblies/:id/duplicate      // Duplicate assembly

// Real-time WebSocket
WS     /api/v1/assemblies/:id/collaborate    // Real-time editing

2. Template Management Service (TMS)

Technologies: Node.js + MongoDB + Redis Responsibilities:

  • Component template library
  • Material management
  • Template versioning
  • Dependency resolution

API Endpoints:

GET    /api/v1/templates/components          // List component templates
GET    /api/v1/templates/materials           // List material templates
POST   /api/v1/templates/components          // Create component template
GET    /api/v1/templates/:id                 // Get template details
PUT    /api/v1/templates/:id                 // Update template
POST   /api/v1/templates/:id/validate        // Validate template

// Template optimization
POST   /api/v1/templates/optimize            // Batch optimize templates
GET    /api/v1/templates/dependencies/:id    // Get dependencies
POST   /api/v1/templates/resolve             // Resolve template dependencies

3. Content Management Service (CMS)

Technologies: Node.js + S3/MinIO + Redis Responsibilities:

  • 3D asset storage & delivery
  • Asset compression & optimization
  • CDN integration
  • Progressive loading

API Endpoints:

// Asset management
POST   /api/v1/assets/upload                 // Upload 3D assets
GET    /api/v1/assets/:id                    // Get asset
POST   /api/v1/assets/:id/optimize           // Optimize asset
DELETE /api/v1/assets/:id                    // Delete asset

// Progressive loading
GET    /api/v1/assets/:id/stream             // Stream asset chunks
GET    /api/v1/assets/:id/lod/:level         // Get LOD version
POST   /api/v1/assets/preload                // Preload asset bundle

// CDN integration  
GET    /api/v1/cdn/status                    // CDN cache status
POST   /api/v1/cdn/invalidate                // Invalidate CDN cache

⚡ 3. PERFORMANCE & SCALABILITY STRATEGY

Caching Strategy

// Redis Cache Layers
interface CacheStrategy {
  // Level 1: Hot data (1-minute TTL)
  hotData: {
    popularAssemblies: "assemblies:popular",
    userSessions: "sessions:*",
    realtimeMetrics: "metrics:realtime:*"
  },
  
  // Level 2: Warm data (1-hour TTL)  
  warmData: {
    assemblyMetadata: "assemblies:meta:*",
    templateDefinitions: "templates:*",
    userProfiles: "users:profile:*"
  },
  
  // Level 3: Cold data (24-hour TTL)
  coldData: {
    performanceAnalytics: "analytics:*",
    searchIndexes: "search:*",
    staticContent: "static:*"
  }
}

CDN Strategy

interface CDNStrategy {
  // Global distribution
  regions: ["us-east", "eu-west", "asia-pacific"],
  
  // Asset optimization
  compression: {
    gltf: "draco",        // 90% compression
    textures: "webp",     // 25-50% smaller  
    json: "gzip",         // 70% compression
  },
  
  // Progressive delivery
  streaming: {
    chunkSize: "1MB",
    preloadRadius: 50,
    priority: "distance-based"
  },
  
  // Cache policies
  cacheTTL: {
    models: "7d",         // 3D models rarely change
    templates: "24h",     // Templates change occasionally  
    assemblies: "1h",     // Assemblies change frequently
    userProgress: "0"     // Never cache user data
  }
}

Database Scaling

interface ScalingStrategy {
  // MongoDB sharding
  sharding: {
    shardKey: "assemblyId",
    chunks: {
      "shard-1": "assemblies:0-1000",
      "shard-2": "assemblies:1001-2000", 
      "shard-3": "assemblies:2001+"
    }
  },
  
  // Read replicas
  readReplicas: {
    primary: "write-operations",
    secondary1: "analytics-queries", 
    secondary2: "user-progress-reads"
  },
  
  // Indexing strategy
  indexes: {
    assemblies: ["searchKeywords", "category", "difficulty"],
    templates: ["templateId", "category", "usage.popularityScore"],
    userProgress: ["userId", "assemblyId", "lastActiveAt"]
  }
}

🔐 4. SECURITY & AUTHENTICATION

Auth Strategy

interface AuthStrategy {
  // JWT-based authentication
  jwt: {
    accessToken: "15min",    // Short-lived
    refreshToken: "7d",      // Longer-lived
    signingAlgorithm: "RS256"
  },
  
  // Role-based access control
  roles: {
    student: ["view", "interact", "progress"],
    teacher: ["create", "edit", "assign", "analytics"], 
    admin: ["all"]
  },
  
  // API security
  rateLimiting: {
    general: "100req/min",
    upload: "10req/min", 
    realtime: "1000req/min"
  }
}

📈 5. MONITORING & ANALYTICS

Real-time Monitoring

interface MonitoringStrategy {
  // Service health
  healthChecks: {
    assemblies: "/health",
    templates: "/health", 
    content: "/health"
  },
  
  // Performance metrics
  metrics: {
    responseTime: "p95 < 200ms",
    throughput: "> 1000 rps",
    errorRate: "< 0.1%",
    uptime: "> 99.9%"
  },
  
  // Business metrics
  analytics: {
    userEngagement: "time-spent, completion-rate",
    contentPerformance: "view-count, ratings",
    systemPerformance: "load-time, fps"
  }
}

🚀 6. DEPLOYMENT STRATEGY

Container Architecture

# docker-compose.yml
version: '3.8'
services:
  # API Gateway
  api-gateway:
    image: nginx:alpine
    ports: ["80:80", "443:443"]
    
  # Core services
  assembly-service:
    image: node:18-alpine
    environment:
      - DATABASE_URL=mongodb://mongo:27017/assemblies
      - REDIS_URL=redis://redis:6379
    scale: 3
    
  template-service:
    image: node:18-alpine
    scale: 2
    
  content-service:
    image: node:18-alpine  
    scale: 2
    
  # Databases
  mongodb:
    image: mongo:6
    volumes: ["./data/mongo:/data/db"]
    
  redis:
    image: redis:alpine
    
  # Storage
  minio:
    image: minio/minio
    environment:
      - MINIO_ACCESS_KEY=minioaccess
      - MINIO_SECRET_KEY=miniosecret

🎯 NEXT STEPS IMPLEMENTATION

Dựa trên chiến lược này, thứ tự triển khai nên là:

  1. Phase 1: Assembly Management Service + MongoDB setup
  2. Phase 2: Template Management Service + Redis caching
  3. Phase 3: Content Management Service + S3/MinIO storage
  4. Phase 4: API Gateway + Load balancing
  5. Phase 5: Analytics & Monitoring services
  6. Phase 6: CDN integration + Global deployment

Bạn muốn tôi chi tiết về phase nào trước, hoặc có muốn tôi implement demo cho service nào cụ thể không? 🚀