Enterprise Laravel: Architecture Review

# Pull Request Template (.github/pull_request_template.md) ## Description Brief description of changes ## Type of Change - [ ] Bug fix (non-breaking change fixing an issue) - [ ] New feature (non-breaking change adding functionality) - [ ] Breaking change (fix or feature causing existing functionality to change) - [ ] Documentation update ## Changes Made - List key changes - Include relevant context - Link related issues ## Testing - [ ] Unit tests added/updated - [ ] Feature tests added/updated - [ ] Manual testing completed - [ ] All tests passing ## Database Changes - [ ] Migrations added - [ ] Seeders updated - [ ] Database documentation updated ## Performance Impact - [ ] No performance impact - [ ] Performance improved - [ ] Performance degraded (explain why acceptable) ## Security Considerations - [ ] No security implications - [ ] Security reviewed and approved - [ ] Security concerns addressed ## Checklist - [ ] Code follows project style guidelines - [ ] Self-reviewed my code - [ ] Commented code in hard-to-understand areas - [ ] Updated documentation - [ ] No new warnings generated - [ ] Added tests that prove fix/feature works - [ ] Dependent changes merged ## Screenshots (if applicable) ## Additional Notes

<?php /** * CODE REVIEW CHECKLIST * * FUNCTIONALITY * - Does the code do what it's supposed to do? * - Are edge cases handled? * - Is error handling appropriate? * - Are inputs validated? * * ARCHITECTURE * - Does it follow SOLID principles? * - Is code properly separated (concerns, layers)? * - Are dependencies injected rather than instantiated? * - Is the right design pattern used? * * SECURITY * - Are all inputs sanitized? * - Is authorization checked? * - Are SQL injections prevented? * - Are sensitive data encrypted? * - Is CSRF protection in place? * * PERFORMANCE * - Are N+1 queries avoided? * - Is caching implemented where appropriate? * - Are database indexes present? * - Is pagination used for large datasets? * - Are jobs queued for long-running tasks? * * TESTING * - Are tests present and comprehensive? * - Do tests cover happy path and edge cases? * - Are tests readable and maintainable? * - Is test coverage adequate (>80%)? * * MAINTAINABILITY * - Is code self-documenting? * - Are complex areas commented? * - Are naming conventions followed? * - Is code DRY (Don't Repeat Yourself)? * - Can code be easily understood in 6 months? */ // GOOD: Clear, testable, maintainable class OrderProcessor { public function __construct( private PaymentGateway $paymentGateway, private InventoryService $inventory, private NotificationService $notifications ) {} public function process(Order $order): ProcessedOrder { DB::beginTransaction(); try { // Validate inventory availability $this->inventory->reserve($order->items); // Process payment $payment = $this->paymentGateway->charge( $order->customer, $order->total ); // Update order status $order->markAsPaid($payment->id); $order->save(); DB::commit(); // Send notifications asynchronously ProcessOrderNotifications::dispatch($order); return new ProcessedOrder($order, $payment); } catch (InsufficientInventoryException $e) { DB::rollBack(); throw new OrderProcessingException('Out of stock', 0, $e); } catch (PaymentFailedException $e) { DB::rollBack(); $this->inventory->release($order->items); throw new OrderProcessingException('Payment failed', 0, $e); } } } // BAD: Hard to test, tight coupling, unclear responsibilities class OrderController { public function process(Request $request) { $order = Order::find($request->order_id); // Inline payment processing $stripe = new \Stripe\StripeClient(config('stripe.secret')); $charge = $stripe->charges->create([ 'amount' => $order->total * 100, 'currency' => 'usd', 'customer' => $order->customer->stripe_id, ]); // No transaction $order->status = 'paid'; $order->save(); // No inventory check foreach ($order->items as $item) { $item->product->decrement('stock', $item->quantity); } // Synchronous email (blocks request) Mail::to($order->customer)->send(new OrderConfirmation($order)); return redirect()->back(); } }

# docs/adr/001-use-repository-pattern.md # 1. Use Repository Pattern for Data Access Date: 2024-01-15 ## Status Accepted ## Context We need a consistent way to access data across the application. Our current approach of using Eloquent models directly in controllers leads to: - Fat controllers with business logic - Difficulty testing (hard to mock database) - Inconsistent query patterns across the application - Difficulty switching data sources in the future ## Decision We will implement the Repository Pattern for all data access: - Create repository interfaces in `app/Contracts/Repositories` - Implement repositories in `app/Repositories` - Bind repositories to interfaces in service providers - Inject repositories into controllers/services via constructor Example: ```php interface UserRepositoryInterface { public function findById(int $id): ?User; public function findByEmail(string $email): ?User; public function create(array $data): User; public function update(User $user, array $data): User; } class EloquentUserRepository implements UserRepositoryInterface { // Implementation using Eloquent } ``` ## Consequences ### Positive - Controllers become thin and focused - Business logic moves to services - Easy to test with repository mocks - Consistent data access patterns - Can swap implementations (e.g., to use MongoDB) ### Negative - More files and initial boilerplate - Learning curve for junior developers - Slight performance overhead (negligible) ## Alternatives Considered 1. **Keep using Eloquent directly**: Rejected due to tight coupling 2. **Use Query Builder everywhere**: Rejected due to loss of relationships 3. **Create custom data layer**: Rejected as over-engineering ## References - [Martin Fowler on Repository Pattern](https://martinfowler.com/eaaCatalog/repository.html) - Laravel Repository Pattern discussion in team meeting (2024-01-10)

<?php /** * TECHNICAL DEBT TRACKING * * Use TODO tags with standardized format for tracking: * * TODO: [CATEGORY] Description (created: YYYY-MM-DD, priority: HIGH/MEDIUM/LOW) * * Categories: * - PERF: Performance issue * - SECURITY: Security concern * - REFACTOR: Code needs refactoring * - TEST: Missing or inadequate tests * - DOCS: Missing or outdated documentation * - TECH-DEBT: General technical debt * - DEPRECATED: Using deprecated feature */ class UserService { // TODO: [PERF] Implement caching for user preferences (created: 2024-01-15, priority: HIGH) // Currently hitting database on every request. Should cache for 1 hour. // Estimated effort: 2 hours public function getUserPreferences(User $user): array { return $user->preferences()->get()->toArray(); } // TODO: [REFACTOR] Extract email verification to separate service (created: 2024-01-10, priority: MEDIUM) // This method is doing too much. Should move email logic to EmailVerificationService. // Estimated effort: 4 hours public function registerUser(array $data): User { $user = User::create($data); // Email verification logic $token = Str::random(60); $user->email_verification_token = $token; $user->save(); Mail::to($user)->send(new VerifyEmail($token)); return $user; } // TODO: [TEST] Add integration tests for role assignment (created: 2024-01-08, priority: HIGH) // Only unit tests exist. Need tests covering actual database interactions. // Estimated effort: 3 hours public function assignRole(User $user, string $role): void { $user->roles()->attach(Role::where('name', $role)->first()); } } // TECHNICAL DEBT REGISTRY (docs/technical-debt.md) /* # Technical Debt Registry ## High Priority (address within 1 month) 1. **Implement caching for user preferences** (UserService.php:15) - Impact: Performance - 200ms delay on every request - Effort: 2 hours - Owner: Backend Team 2. **Add integration tests for role assignment** (UserService.php:35) - Impact: Quality - No coverage for critical security feature - Effort: 3 hours - Owner: QA Team ## Medium Priority (address within 3 months) 1. **Extract email verification to separate service** (UserService.php:25) - Impact: Maintainability - Service doing too much - Effort: 4 hours - Owner: Backend Team ## Completed (keep for reference) - ~~Migrate to Laravel 11~~ (Completed: 2024-01-20) - ~~Implement rate limiting on API~~ (Completed: 2024-01-18) */

<?php /** * HORIZONTAL SCALING CHECKLIST * * 1. SESSION STORAGE * - Move from file-based to database/Redis * - Configure SESSION_DRIVER=redis in .env * * 2. CACHE STORAGE * - Use Redis/Memcached instead of file cache * - Configure CACHE_DRIVER=redis in .env * * 3. QUEUE WORKERS * - Run queue workers on separate servers * - Use Supervisor/systemd for worker management * - Scale workers based on queue depth * * 4. FILE STORAGE * - Use S3/CloudFront for uploads * - Configure FILESYSTEM_DISK=s3 in .env * * 5. DATABASE * - Implement read replicas * - Use database connection pooling * - Consider sharding for massive scale * * 6. LOAD BALANCING * - Setup load balancer (AWS ALB, Nginx) * - Enable sticky sessions if needed * - Health checks for all app servers */ // config/database.php - Read/Write Splitting 'mysql' => [ 'read' => [ 'host' => [ env('DB_READ_HOST_1', '127.0.0.1'), env('DB_READ_HOST_2', '127.0.0.1'), ], ], 'write' => [ 'host' => [ env('DB_WRITE_HOST', '127.0.0.1'), ], ], 'sticky' => true, // Ensure reads after writes go to write server // ... other config ], // Horizontal Pod Autoscaler (Kubernetes) /* apiVersion: autoscaling/v2 kind: HorizontalPodAutoscaler metadata: name: laravel-app spec: scaleTargetRef: apiVersion: apps/v1 kind: Deployment name: laravel-app minReplicas: 3 maxReplicas: 20 metrics: - type: Resource resource: name: cpu target: type: Utilization averageUtilization: 70 - type: Resource resource: name: memory target: type: Utilization averageUtilization: 80 */ // Performance Monitoring class PerformanceMiddleware { public function handle($request, Closure $next) { $start = microtime(true); $response = $next($request); $duration = (microtime(true) - $start) * 1000; // Log slow requests if ($duration > 1000) { Log::warning('Slow request detected', [ 'url' => $request->fullUrl(), 'method' => $request->method(), 'duration_ms' => $duration, 'memory_mb' => memory_get_peak_usage(true) / 1024 / 1024, 'queries' => DB::getQueryLog(), ]); } // Add performance headers $response->headers->set('X-Response-Time', round($duration, 2) . 'ms'); $response->headers->set('X-Query-Count', count(DB::getQueryLog())); return $response; } }

# TEAM WORKFLOW GUIDELINES ## Git Workflow - **Main branch**: Always production-ready, deploy from here - **Develop branch**: Integration branch for features - **Feature branches**: feature/ticket-number-description - **Bugfix branches**: bugfix/ticket-number-description - **Hotfix branches**: hotfix/issue-description (directly from main) ## Naming Conventions - **Controllers**: Singular noun + "Controller" (UserController) - **Models**: Singular noun (User, Post) - **Database tables**: Plural snake_case (users, blog_posts) - **Migrations**: action_table_name (create_users_table) - **Jobs**: Verb + Noun (ProcessOrder, SendEmail) - **Events**: Past tense verb (OrderShipped, UserRegistered) - **Listeners**: Action descriptor (SendShipmentNotification) - **Requests**: Noun + Action + "Request" (StoreUserRequest) - **Resources**: Noun + "Resource" (UserResource) - **Tests**: test_it_does_something (test_it_creates_user) ## Code Organization by Domain app/ ├── Domain/ │ ├── Users/ │ │ ├── Models/User.php │ │ ├── Repositories/UserRepository.php │ │ ├── Services/UserService.php │ │ ├── Actions/CreateUser.php │ │ ├── Events/UserCreated.php │ │ └── Policies/UserPolicy.php │ ├── Orders/ │ │ ├── Models/Order.php │ │ ├── Repositories/OrderRepository.php │ │ ├── Services/OrderService.php │ │ ├── Actions/ProcessOrder.php │ │ └── Events/OrderProcessed.php │ └── ... └── Http/ ├── Controllers/ │ ├── Api/ │ └── Web/ ├── Middleware/ ├── Requests/ └── Resources/ ## Documentation Standards - **README.md**: Project overview, setup instructions, deployment - **docs/api/**: API documentation (OpenAPI/Swagger) - **docs/adr/**: Architecture Decision Records - **docs/runbooks/**: Operational procedures - **CONTRIBUTING.md**: How to contribute - **CHANGELOG.md**: Version history ## Pull Request Workflow 1. Create feature branch from develop 2. Implement feature with tests 3. Self-review code 4. Create pull request with template filled 5. Address CI/CD feedback (tests, linting) 6. Request review from 2 team members 7. Address review comments 8. Merge after 2 approvals + passing CI ## Communication - **Daily standup**: 9:30 AM - What did, what will do, blockers - **Sprint planning**: Every 2 weeks - Plan upcoming work - **Retrospective**: End of sprint - What went well, what to improve - **Code review**: Respond within 4 hours during work hours - **Slack channels**: - #engineering: General engineering discussion - #deployments: Deployment notifications - #incidents: Production issues - #code-review: Quick code questions

# PRODUCTION READINESS CHECKLIST ## Security - [ ] Debug mode disabled (APP_DEBUG=false) - [ ] Strong APP_KEY generated and secured - [ ] HTTPS enforced - [ ] CORS configured correctly - [ ] Rate limiting implemented - [ ] Input validation on all forms - [ ] SQL injection prevention verified - [ ] XSS protection enabled - [ ] CSRF protection enabled - [ ] Authentication tested thoroughly - [ ] Authorization policies reviewed - [ ] API authentication implemented (Sanctum/Passport) - [ ] Secrets stored in environment variables - [ ] Database credentials rotated - [ ] Third-party dependencies audited ## Performance - [ ] Query optimization completed (no N+1) - [ ] Database indexes added - [ ] Caching implemented - [ ] Asset compilation and minification - [ ] CDN configured for static assets - [ ] Image optimization - [ ] Lazy loading implemented - [ ] Pagination on large datasets - [ ] Queue workers for long-running tasks - [ ] Load testing completed ## Monitoring - [ ] Error tracking (Sentry, Bugsnag) - [ ] Application performance monitoring (New Relic, Scout) - [ ] Log aggregation (CloudWatch, Papertrail) - [ ] Uptime monitoring (Pingdom, UptimeRobot) - [ ] Database monitoring - [ ] Queue monitoring - [ ] Disk space monitoring - [ ] Alerts configured for critical issues ## Backup & Recovery - [ ] Database backups automated - [ ] Backup restoration tested - [ ] File storage backups configured - [ ] Disaster recovery plan documented - [ ] RTO/RPO defined ## Documentation - [ ] API documentation complete - [ ] Deployment process documented - [ ] Rollback procedure documented - [ ] Environment variables documented - [ ] Architecture diagrams updated - [ ] Runbooks created for common issues ## Testing - [ ] Unit test coverage >80% - [ ] Integration tests passing - [ ] End-to-end tests passing - [ ] Browser compatibility tested - [ ] Mobile responsiveness verified - [ ] Accessibility standards met (WCAG) - [ ] Security penetration testing completed ## Infrastructure - [ ] Auto-scaling configured - [ ] Load balancer health checks - [ ] Database read replicas (if needed) - [ ] Redis/cache servers provisioned - [ ] Queue workers configured with Supervisor - [ ] SSL certificate configured and auto-renewal - [ ] DNS configured correctly - [ ] Firewall rules reviewed