🏗️ Gati Architecture Analysis & Design Report

Date: November 9, 2025
Author: GitHub Copilot (Architecture Analysis)
Project: Gati Framework
Current Status: M1 Foundation - 40% Complete (6/15 issues)

📋 Executive Summary

This document provides a comprehensive analysis of the current Gati architecture, identifies design strengths, proposes improvements, and outlines the system design for remaining milestones. The framework is currently in M1 (Foundation & Core Runtime) with a solid architectural foundation built on clean separation of concerns and functional programming principles.

Key Findings

✅ Strengths:

Clean layered architecture with clear separation of concerns
Type-safe design with comprehensive TypeScript interfaces
Functional programming patterns (pure functions, immutability)
Extensive test coverage (182 tests, >80% coverage)
Well-documented code with JSDoc comments

⚠️ Areas for Improvement:

Module system not yet implemented (Issue #9)
No versioning system (M3 milestone)
Missing deployment infrastructure (M2 milestone)
No observability/logging framework
Limited error context propagation

🎯 Current Architecture Overview

System Layers

┌─────────────────────────────────────────────────────────────┐
│                      Client Layer                            │
│              (Future: CDN, SSL, Load Balancer)              │
└──────────────────────┬──────────────────────────────────────┘
                       │
┌──────────────────────▼──────────────────────────────────────┐
│                   App Core Layer                             │
│  - HTTP Server Lifecycle (start/stop/restart)               │
│  - Request/Response Wrapping                                │
│  - Global Middleware Pipeline                               │
│  - Error Handling (404, 500)                                │
└──────────────────────┬──────────────────────────────────────┘
                       │
┌──────────────────────▼──────────────────────────────────────┐
│                  Routing Layer                               │
│  - Route Registration (GET, POST, PUT, etc.)                │
│  - Pattern Matching (path params with :syntax)              │
│  - Route-Specific Middleware                                │
└──────────────────────┬──────────────────────────────────────┘
                       │
┌──────────────────────▼──────────────────────────────────────┐
│                 Handler Execution Layer                      │
│  - Handler Pipeline Execution                               │
│  - Context Management (gctx, lctx)                          │
│  - Error Propagation                                        │
└──────────────────────┬──────────────────────────────────────┘
                       │
┌──────────────────────▼──────────────────────────────────────┐
│              Business Logic Layer                            │
│  - Handlers (req, res, gctx, lctx) => void                 │
│  - Modules (Future: Issue #9)                               │
│  - Effects (Future: M7)                                     │
└─────────────────────────────────────────────────────────────┘

🧩 Component Analysis

1. Request/Response System

Files: src/runtime/request.ts, src/runtime/response.ts

Current Design:

Thin wrappers around Node.js IncomingMessage and ServerResponse
Immutable request properties (method, path, headers, body, params)
Mutable response properties (status, headers, body)
Helper methods for common operations (json, text, redirect, etc.)

Strengths:

✅ Type-safe with comprehensive interfaces
✅ Convenience methods for common response types
✅ Cookie management built-in
✅ Header manipulation with validation
✅ headersSent flag prevents double-send errors

Improvements Needed:

Request Body Parsing

typescript

// Current: Manual body parsing required
// Recommended: Add automatic body parsing middleware

interface RequestOptions {
  bodyParser?: 'json' | 'urlencoded' | 'raw' | 'text';
  bodyLimit?: number; // Default: 1MB
}

Response Streaming

typescript

// Add streaming support for large responses
interface Response {
  stream(readable: Readable): void;
  pipe(source: Readable): void;
}

Content Negotiation

typescript

// Add automatic content type negotiation
interface Request {
  accepts(...types: string[]): string | false;
  acceptsEncodings(...encodings: string[]): string | false;
}

2. Context Management

Files: src/runtime/global-context.ts, src/runtime/local-context.ts, src/runtime/context-manager.ts

Current Design:

Global Context (gctx): Shared across all requests, read-only after init
Local Context (lctx): Request-scoped, mutable
Context Manager: Factory pattern for context creation

Strengths:

✅ Clear separation between shared and request-scoped state
✅ Type-safe module registry
✅ Request ID tracking
✅ Metadata storage

Improvements Needed:

Context Inheritance

typescript

// Add parent-child context relationships for nested operations
interface LocalContext {
  parent?: LocalContext;
  createChild(): LocalContext;
}

Context Cleanup Hooks

typescript

// Add lifecycle hooks for cleanup
interface LocalContext {
  onComplete(callback: () => void): void;
  onError(callback: (error: Error) => void): void;
}

Async Local Storage Integration

typescript

// Use Node.js AsyncLocalStorage for context propagation
import { AsyncLocalStorage } from 'async_hooks';

class ContextManager {
  private als = new AsyncLocalStorage<LocalContext>();
  
  static current(): LocalContext {
    return this.als.getStore();
  }
}

3. Routing System

Files: src/runtime/route-parser.ts, src/runtime/route-manager.ts

Current Design:

Pattern-based routing with :param syntax
Regex compilation for performance
First-match-wins strategy
Path normalization (slashes, URI decoding)

Strengths:

✅ Fast pattern matching with compiled regex
✅ Automatic URI decoding
✅ Path normalization handles edge cases
✅ Support for all HTTP methods
✅ Comprehensive test coverage (55 tests)

Improvements Needed:

Wildcard Routes

typescript

// Add support for wildcard segments
router.get('/files/*path', handler); // Match /files/a/b/c.txt

Route Constraints

typescript

// Add parameter validation at route level
interface RouteOptions {
  constraints?: {
    id: /^\d+$/,  // Numeric IDs only
    slug: /^[a-z0-9-]+$/  // URL-safe slugs
  };
}

Route Groups & Prefixes

typescript

// Add route grouping for organization
const apiRoutes = router.group('/api/v1', (group) => {
  group.get('/users', handler);
  group.post('/users', handler);
});

Route Metadata

typescript

// Add route metadata for documentation/introspection
interface Route {
  metadata?: {
    description?: string;
    tags?: string[];
    deprecated?: boolean;
    rateLimit?: { requests: number; window: number };
  };
}

4. Handler Execution Engine

Files: src/runtime/handler-engine.ts

Current Design:

Simple pipeline: execute handler with (req, res, gctx, lctx)
Error catching and propagation
Timeout support (default: 30s)
Handler validation

Strengths:

✅ Clean handler signature
✅ Error boundaries
✅ Timeout protection
✅ Type-safe execution

Improvements Needed:

Handler Composition

typescript

// Add handler composition utilities
function compose(...handlers: Handler[]): Handler {
  return async (req, res, gctx, lctx) => {
    for (const handler of handlers) {
      await handler(req, res, gctx, lctx);
      if (res.headersSent) break;
    }
  };
}

Handler Lifecycle Hooks

typescript

// Add before/after hooks
interface HandlerOptions {
  before?: Handler[];
  after?: Handler[];
  onError?: ErrorHandler;
}

Execution Tracing

typescript

// Add OpenTelemetry tracing
interface HandlerExecutionOptions {
  tracer?: Tracer;
  spanAttributes?: Record<string, unknown>;
}

5. Middleware System

Files: src/runtime/middleware.ts, src/runtime/types/middleware.ts

Current Design:

Pipeline-based execution
Global and route-specific middleware
Async support with next() callback
Error handling with MiddlewareError

Strengths:

✅ Express-like middleware pattern (familiar to developers)
✅ Error handling with context
✅ Type-safe middleware signature
✅ Priority-based ordering

Improvements Needed:

Middleware Composition

typescript

// Add middleware composition utilities
function chain(...middlewares: Middleware[]): Middleware {
  return async (req, res, gctx, lctx, next) => {
    let index = 0;
    const dispatch = async () => {
      if (index >= middlewares.length) return next();
      await middlewares[index++](req, res, gctx, lctx, dispatch);
    };
    await dispatch();
  };
}

Conditional Middleware

typescript

// Add conditional execution
function when(
  condition: (req: Request) => boolean,
  middleware: Middleware
): Middleware {
  return async (req, res, gctx, lctx, next) => {
    if (condition(req)) {
      await middleware(req, res, gctx, lctx, next);
    } else {
      await next();
    }
  };
}

Middleware Performance Monitoring

typescript

// Add timing and performance metrics
interface MiddlewareEntry {
  execution: {
    count: number;
    totalTime: number;
    avgTime: number;
    errors: number;
  };
}

6. App Core

Files: src/runtime/app-core.ts

Current Design:

HTTP server lifecycle management
Route registration with HTTP method shortcuts
Global middleware registration
Centralized error handling
Graceful shutdown

Strengths:

✅ Simple API surface
✅ Lifecycle management (start/stop/restart)
✅ Error handling with appropriate status codes
✅ Graceful shutdown with cleanup

Improvements Needed:

Plugin System

typescript

// Add plugin architecture for extensibility
interface Plugin {
  name: string;
  version: string;
  install(app: GatiApp): void | Promise<void>;
}

class GatiApp {
  use(plugin: Plugin): this;
}

Health Checks

typescript

// Add health check endpoints
interface AppConfig {
  healthCheck?: {
    enabled: boolean;
    path: string; // Default: /_health
    checks: HealthCheck[];
  };
}

Metrics & Observability

typescript

// Add built-in metrics
interface AppMetrics {
  requests: { total: number; perSecond: number };
  errors: { total: number; rate: number };
  latency: { p50: number; p95: number; p99: number };
}

Configuration Hot Reload

typescript

// Add configuration reloading without restart
class GatiApp {
  reloadConfig(config: Partial<AppConfig>): Promise<void>;
  on(event: 'configReloaded', callback: () => void): void;
}

🎨 Proposed Architecture Improvements

1. Layered Architecture Enhancement

┌───────────────────────────────────────────────────────────┐
│                   Edge Layer (Future)                     │
│  - CDN (CloudFront, Cloud CDN, Azure Front Door)         │
│  - SSL Termination (ACM, Let's Encrypt)                  │
│  - DDoS Protection                                        │
│  - Rate Limiting (Global)                                │
└────────────────────┬──────────────────────────────────────┘
                     │
┌────────────────────▼──────────────────────────────────────┐
│              Gateway Layer (Future M3)                    │
│  - API Versioning (Timestamp → Version Resolution)       │
│  - Request Routing (Version-Aware)                       │
│  - API Key Validation                                    │
│  - Request Logging                                       │
└────────────────────┬──────────────────────────────────────┘
                     │
┌────────────────────▼──────────────────────────────────────┐
│               Application Layer (Current)                 │
│  ┌──────────────────────────────────────────────────┐   │
│  │ App Core: HTTP Server + Lifecycle                │   │
│  └──────────────────┬───────────────────────────────┘   │
│                     │                                     │
│  ┌──────────────────▼───────────────────────────────┐   │
│  │ Middleware Pipeline: Global + Route-Specific     │   │
│  └──────────────────┬───────────────────────────────┘   │
│                     │                                     │
│  ┌──────────────────▼───────────────────────────────┐   │
│  │ Router: Pattern Matching + Parameter Extraction  │   │
│  └──────────────────┬───────────────────────────────┘   │
│                     │                                     │
│  ┌──────────────────▼───────────────────────────────┐   │
│  │ Handler Engine: Execution + Error Handling       │   │
│  └──────────────────┬───────────────────────────────┘   │
└────────────────────┬──────────────────────────────────────┘
                     │
┌────────────────────▼──────────────────────────────────────┐
│              Business Logic Layer                         │
│  ┌──────────────────────────────────────────────────┐   │
│  │ Handlers: Request Processing                     │   │
│  └──────────────────────────────────────────────────┘   │
│  ┌──────────────────────────────────────────────────┐   │
│  │ Modules: Reusable Logic (Issue #9)              │   │
│  └──────────────────────────────────────────────────┘   │
│  ┌──────────────────────────────────────────────────┐   │
│  │ Effects: Async Tasks (M7)                        │   │
│  └──────────────────────────────────────────────────┘   │
└────────────────────┬──────────────────────────────────────┘
                     │
┌────────────────────▼──────────────────────────────────────┐
│           Infrastructure Layer (Future M2)                │
│  - Kubernetes Orchestration                              │
│  - Auto Scaling (HPA)                                    │
│  - Service Mesh                                          │
│  - Secret Management                                     │
└───────────────────────────────────────────────────────────┘
                     │
┌────────────────────▼──────────────────────────────────────┐
│            Observability Layer (Future M4)                │
│  - Metrics (Prometheus)                                  │
│  - Logs (Loki)                                           │
│  - Traces (OpenTelemetry)                                │
│  - Alerts (AlertManager)                                 │
└───────────────────────────────────────────────────────────┘

2. Module System Architecture (Issue #9)

Recommended Design:

typescript

// Module Interface
interface Module {
  name: string;
  version: string;
  dependencies?: string[];
  
  // Lifecycle hooks
  init?(gctx: GlobalContext): Promise<void>;
  shutdown?(): Promise<void>;
  
  // Module exports (business logic)
  exports: Record<string, unknown>;
}

// Module Registry with Dependency Injection
class ModuleRegistry {
  private modules = new Map<string, Module>();
  private instances = new Map<string, unknown>();
  
  register(module: Module): void {
    // Validate dependencies
    this.validateDependencies(module);
    
    // Store module
    this.modules.set(module.name, module);
  }
  
  async load(name: string, gctx: GlobalContext): Promise<unknown> {
    // Check cache
    if (this.instances.has(name)) {
      return this.instances.get(name);
    }
    
    // Get module
    const module = this.modules.get(name);
    if (!module) throw new Error(`Module ${name} not found`);
    
    // Load dependencies first
    for (const dep of module.dependencies || []) {
      await this.load(dep, gctx);
    }
    
    // Initialize module
    if (module.init) {
      await module.init(gctx);
    }
    
    // Cache instance
    this.instances.set(name, module.exports);
    
    return module.exports;
  }
}

// Usage in handlers
const handler: Handler = async (req, res, gctx, lctx) => {
  const db = gctx.modules.get('database');
  const user = await db.users.findById(req.params.id);
  res.json({ user });
};

Benefits:

Clear separation of concerns
Dependency injection out of the box
Lazy loading support
Testable modules (easy mocking)
Version management per module

3. Versioning System Architecture (M3)

Recommended Design:

typescript

// Version Snapshot
interface VersionSnapshot {
  version: string; // Semver: 1.2.3
  timestamp: Date; // Deployment time
  routes: RouteSnapshot[];
  modules: ModuleSnapshot[];
  hash: string; // Git commit SHA
}

interface RouteSnapshot {
  method: HttpMethod;
  path: string;
  handlerSignature: string; // TypeScript AST hash
  paramTypes: Record<string, string>;
  responseType: string;
}

// Version Router
class VersionRouter {
  private snapshots: VersionSnapshot[] = [];
  
  // Resolve timestamp to version
  resolveVersion(timestamp: Date): VersionSnapshot {
    // Binary search for closest version before timestamp
    return this.snapshots
      .filter(s => s.timestamp <= timestamp)
      .sort((a, b) => b.timestamp.getTime() - a.timestamp.getTime())[0];
  }
  
  // Route request to correct version
  route(req: Request): RouteMatch | null {
    const versionHeader = req.headers['x-api-version'];
    
    if (!versionHeader) {
      // Use latest version
      return this.routeLatest(req);
    }
    
    // Parse version (timestamp or semver)
    const version = this.parseVersion(versionHeader);
    const snapshot = this.resolveVersion(version);
    
    // Match route in snapshot
    return this.matchRoute(req, snapshot);
  }
}

// Version Analyzer (Codegen)
class VersionAnalyzer {
  // Compare two handler signatures
  detectBreakingChanges(
    oldHandler: RouteSnapshot,
    newHandler: RouteSnapshot
  ): BreakingChange[] {
    const changes: BreakingChange[] = [];
    
    // Check parameter changes
    if (!this.isCompatible(oldHandler.paramTypes, newHandler.paramTypes)) {
      changes.push({
        type: 'parameter-change',
        old: oldHandler.paramTypes,
        new: newHandler.paramTypes
      });
    }
    
    // Check response type changes
    if (oldHandler.responseType !== newHandler.responseType) {
      changes.push({
        type: 'response-type-change',
        old: oldHandler.responseType,
        new: newHandler.responseType
      });
    }
    
    return changes;
  }
  
  // Suggest version bump
  suggestVersionBump(changes: BreakingChange[]): 'major' | 'minor' | 'patch' {
    if (changes.length > 0) return 'major';
    // ... minor/patch logic
    return 'patch';
  }
}

Benefits:

Backward compatibility guaranteed
Timestamp-based version resolution
Automatic breaking change detection
Client can pin to specific point in time
Supports gradual migrations

4. Observability Architecture

Recommended Design:

typescript

// Unified Observability Interface
interface Observability {
  logger: Logger;
  metrics: Metrics;
  tracer: Tracer;
}

// Structured Logging
interface Logger {
  info(message: string, context?: Record<string, unknown>): void;
  warn(message: string, context?: Record<string, unknown>): void;
  error(message: string, error?: Error, context?: Record<string, unknown>): void;
  debug(message: string, context?: Record<string, unknown>): void;
}

// Metrics Collection
interface Metrics {
  counter(name: string, value: number, labels?: Record<string, string>): void;
  gauge(name: string, value: number, labels?: Record<string, string>): void;
  histogram(name: string, value: number, labels?: Record<string, string>): void;
}

// Distributed Tracing
interface Tracer {
  startSpan(name: string, parent?: Span): Span;
  inject(span: Span, carrier: Record<string, string>): void;
  extract(carrier: Record<string, string>): Span | null;
}

// Integration with handlers
const handler: Handler = async (req, res, gctx, lctx) => {
  const span = lctx.tracer.startSpan('handler.getUserById');
  
  try {
    lctx.logger.info('Fetching user', { userId: req.params.id });
    
    const startTime = Date.now();
    const user = await gctx.modules.get('db').users.findById(req.params.id);
    const duration = Date.now() - startTime;
    
    lctx.metrics.histogram('db.query.duration', duration, { table: 'users' });
    
    res.json({ user });
  } catch (error) {
    lctx.logger.error('Failed to fetch user', error, { userId: req.params.id });
    throw error;
  } finally {
    span.end();
  }
};

🔧 Technical Debt & Improvements

High Priority

Implement Module System (Issue #9)
- Dependency injection
- Module lifecycle management
- Module registry
- Estimated Effort: 3-4 days
Add Observability Framework
- Structured logging (Pino)
- Metrics collection (Prometheus client)
- Distributed tracing (OpenTelemetry)
- Estimated Effort: 2-3 days
Configuration Management
- Environment-based config
- Secret management integration
- Hot reload support
- Estimated Effort: 1-2 days

Medium Priority

Request Body Parsing
- JSON parser middleware
- URL-encoded parser
- Multipart/form-data support
- File upload handling
- Estimated Effort: 1-2 days
Response Streaming
- Stream API integration
- SSE (Server-Sent Events) support
- Chunked responses
- Estimated Effort: 1 day
Route Enhancements
- Wildcard routes
- Route constraints
- Route groups/prefixes
- Route metadata
- Estimated Effort: 2 days

Low Priority

Performance Optimizations
- Route caching
- Response caching layer
- Middleware performance tracking
- Estimated Effort: 1-2 days
Developer Experience
- Better error messages
- Development mode enhancements
- Hot reload for handlers
- Estimated Effort: 1-2 days

📊 Design Patterns Used

Current Patterns

Factory Pattern
- createApp(), createRequest(), createResponse()
- createGlobalContext(), createLocalContext()
- Benefit: Consistent object creation, easy testing
Pipeline Pattern
- Middleware execution chain
- Handler execution pipeline
- Benefit: Composable, testable, easy to extend
Registry Pattern
- Route registry in RouteManager
- Module registry in GlobalContext
- Benefit: Centralized management, discoverability
Strategy Pattern
- Route matching strategy
- Error handling strategy
- Benefit: Swappable implementations
Singleton Pattern
- Global context (one per app instance)
- Benefit: Shared state management

Recommended Additional Patterns

Plugin Pattern

typescript

interface Plugin {
  install(app: GatiApp): void;
}

// Usage
app.use(corsPlugin());
app.use(rateLimitPlugin({ max: 100, window: '1m' }));

Observer Pattern

typescript

// Event-driven architecture
app.on('request', (req) => console.log(req.path));
app.on('error', (error) => logger.error(error));
app.on('shutdown', () => cleanup());

Builder Pattern

typescript

// Complex object construction
const app = new AppBuilder()
  .withPort(3000)
  .withMiddleware(cors())
  .withPlugins([metrics, logging])
  .withModules([database, cache])
  .build();

Adapter Pattern

typescript

// Cloud provider adapters
interface CloudProvider {
  deploy(config: DeployConfig): Promise<void>;
}

class AWSAdapter implements CloudProvider { }
class GCPAdapter implements CloudProvider { }
class AzureAdapter implements CloudProvider { }

🚀 Milestone Readiness Assessment

M1: Foundation & Core Runtime (40% Complete)

Completed:

✅ Handler execution pipeline (Issue #1)
✅ Request/response objects
✅ Global context manager (Issue #7)
✅ Local context manager (Issue #7)
✅ Route registration and routing (Issue #6)
✅ App core integration (Issue #8)

Remaining:

⏳ Module loader with isolation (Issue #9) - CRITICAL
⏳ CLI foundation (Issues #10, #11, #12)
⏳ Project templates (Issue #13)
⏳ Developer documentation (Issues #14, #15, #16, #17)

Blockers: None

Recommendation: Continue with Issue #9 (Module System) next

M2: Cloud Infrastructure (Not Started)

Prerequisites:

✅ M1 runtime complete
❌ Module system ready
❌ CLI ready

Architecture Recommendations:

Plugin-Based Cloud Abstraction

typescript

interface CloudPlugin {
  name: string;
  deploy(app: GatiApp, config: DeployConfig): Promise<DeployResult>;
  scale(app: GatiApp, replicas: number): Promise<void>;
  rollback(app: GatiApp, version: string): Promise<void>;
}

Kubernetes-Native Design
- Generate Kubernetes manifests from app configuration
- Support for Deployments, Services, Ingress, HPA
- ConfigMap/Secret generation from environment variables
Multi-Cloud Support
- AWS: EKS, ALB, CloudFront, ACM
- GCP: GKE, Cloud Load Balancing, Cloud CDN
- Azure: AKS, Azure Load Balancer, Azure Front Door

Estimated Timeline: 3-4 weeks after M1 completion

M3: API Versioning (Not Started)

Prerequisites:

✅ Routing system complete
❌ Handler introspection needed
❌ Version storage needed

Architecture Recommendations:

TypeScript AST Analysis
- Use ts-morph for handler signature analysis
- Extract parameter types, return types
- Generate type hashes for comparison
Version Storage
- Store snapshots in database or object storage
- Index by timestamp and semver
- Support version history API
Request Routing
- Middleware-based version resolution
- Header parsing (semver or timestamp)
- Fallback to latest version

Estimated Timeline: 2-3 weeks after M2 completion

🎯 Recommended Next Steps

Immediate (This Week)

Complete Issue #9: Module System
- Design module interface
- Implement module registry
- Add dependency injection
- Write comprehensive tests
- Priority: P0-CRITICAL
Add Basic Observability
- Integrate Pino for logging
- Add request/response logging middleware
- Log errors with context
- Priority: P1

Short-Term (Next 2 Weeks)

Start CLI Foundation (Issue #10)
- gati create command
- Project templates
- Interactive prompts
- Priority: P0-CRITICAL
Implement Request Body Parsing
- JSON parser middleware
- URL-encoded parser
- File upload support
- Priority: P1

Medium-Term (Month 1)

Complete M1 Milestone
- All 15 issues closed
- Documentation complete
- Example apps working
- Priority: P0
Begin M2 Planning
- Design cloud plugin architecture
- Prototype AWS deployment
- Define Kubernetes manifest templates
- Priority: P0

📈 Performance Considerations

Current Performance Profile

Strengths:

✅ Compiled regex for route matching (O(1) average case)
✅ Minimal middleware overhead
✅ No blocking operations in request path
✅ Efficient object creation (factory pattern)

Optimization Opportunities:

Route Caching

typescript

class RouteManager {
  private cache = new LRU<string, RouteMatch>(1000);
  
  match(method: HttpMethod, path: string): RouteMatch | null {
    const key = `${method}:${path}`;
    if (this.cache.has(key)) {
      return this.cache.get(key);
    }
    
    const match = this.doMatch(method, path);
    if (match) {
      this.cache.set(key, match);
    }
    
    return match;
  }
}

Object Pooling

typescript

// Reuse request/response objects
class ObjectPool<T> {
  private pool: T[] = [];
  
  acquire(): T {
    return this.pool.pop() || this.create();
  }
  
  release(obj: T): void {
    this.reset(obj);
    this.pool.push(obj);
  }
}

Lazy Evaluation

typescript

// Parse body only when accessed
interface Request {
  get body(): unknown {
    if (!this._bodyParsed) {
      this._body = JSON.parse(this._rawBody);
      this._bodyParsed = true;
    }
    return this._body;
  }
}

🔒 Security Considerations

Current Security Posture

Implemented:

✅ Type safety (prevents many injection attacks)
✅ URI decoding (prevents path traversal via encoding)
✅ Error context isolation (doesn't leak internals)

Recommendations:

Input Validation Framework

typescript

import { z } from 'zod';

const schema = z.object({
  email: z.string().email(),
  age: z.number().int().min(0).max(120)
});

const handler: Handler = (req, res, gctx, lctx) => {
  const validated = schema.parse(req.body);
  // ... safe to use
};

Rate Limiting

typescript

// Per-route rate limiting
app.get('/api/users', handler, {
  middleware: [rateLimit({ max: 100, window: '1m' })]
});

CORS Middleware

typescript

app.use(cors({
  origin: ['https://example.com'],
  credentials: true,
  maxAge: 86400
}));

Helmet-Style Security Headers

typescript

app.use(securityHeaders({
  contentSecurityPolicy: true,
  hsts: { maxAge: 31536000 },
  noSniff: true,
  frameguard: { action: 'deny' }
}));

📚 Documentation Needs

Current Documentation

Strengths:

✅ Comprehensive JSDoc comments in code
✅ Clear README with project overview
✅ Detailed PRD with architecture
✅ MILESTONES.md with tracking

Gaps:

API Reference Documentation
- Auto-generate from TypeScript interfaces
- Use TypeDoc or similar
- Publish to docs site
Architecture Diagrams
- System architecture
- Request flow diagram
- Deployment topology
- Module dependency graph
Tutorials & Guides
- Getting started (5-minute quickstart)
- Handler writing guide
- Module creation guide
- Deployment guide (per cloud provider)
- Testing guide
Code Examples
- Real-world examples directory
- REST API example
- GraphQL integration
- WebSocket handling
- File uploads
- Authentication patterns

🎉 Conclusion

The Gati framework has a solid architectural foundation with clean separation of concerns, type safety, and comprehensive testing. The current implementation demonstrates:

Strong Engineering Practices: Functional patterns, immutability, pure functions
Extensibility: Plugin-ready architecture, middleware system
Type Safety: Comprehensive TypeScript coverage
Test Coverage: 182 tests with >80% coverage

Critical Path Forward

Complete M1 (2-3 weeks)
- Finish module system (Issue #9)
- Build CLI foundation (Issues #10-12)
- Add documentation (Issues #14-17)
Prepare for M2 (Planning phase)
- Design cloud plugin architecture
- Prototype Kubernetes deployment
- Define multi-cloud abstractions
Add Observability (Parallel to M1)
- Logging framework
- Metrics collection
- Distributed tracing

Success Metrics

M1 completion: 100% (currently 40%)
Test coverage: >85% (currently ~80%)
Documentation coverage: 100% of public API
Community engagement: GitHub stars, contributors

Report Generated: November 9, 2025
Next Review: After Issue #9 completion
Maintained By: Krishna Paul (@krishnapaul242)

🏗️ Gati Architecture Analysis & Design Report ​

📋 Executive Summary ​

Key Findings ​

🎯 Current Architecture Overview ​

System Layers ​

🧩 Component Analysis ​

1. Request/Response System ​

2. Context Management ​

3. Routing System ​

4. Handler Execution Engine ​

5. Middleware System ​

6. App Core ​

🎨 Proposed Architecture Improvements ​

1. Layered Architecture Enhancement ​

2. Module System Architecture (Issue #9) ​

3. Versioning System Architecture (M3) ​

4. Observability Architecture ​

🔧 Technical Debt & Improvements ​

High Priority ​

Medium Priority ​

Low Priority ​

📊 Design Patterns Used ​

Current Patterns ​

Recommended Additional Patterns ​

🚀 Milestone Readiness Assessment ​

M1: Foundation & Core Runtime (40% Complete) ​

M2: Cloud Infrastructure (Not Started) ​

M3: API Versioning (Not Started) ​

🎯 Recommended Next Steps ​

Immediate (This Week) ​

Short-Term (Next 2 Weeks) ​

Medium-Term (Month 1) ​

📈 Performance Considerations ​

Current Performance Profile ​

🔒 Security Considerations ​

Current Security Posture ​

📚 Documentation Needs ​

Current Documentation ​

🎉 Conclusion ​

Critical Path Forward ​

Success Metrics ​

🏗️ Gati Architecture Analysis & Design Report

📋 Executive Summary

Key Findings

🎯 Current Architecture Overview

System Layers

🧩 Component Analysis

1. Request/Response System

2. Context Management

3. Routing System

4. Handler Execution Engine

5. Middleware System

6. App Core

🎨 Proposed Architecture Improvements

1. Layered Architecture Enhancement

2. Module System Architecture (Issue #9)

3. Versioning System Architecture (M3)

4. Observability Architecture

🔧 Technical Debt & Improvements

High Priority

Medium Priority

Low Priority

📊 Design Patterns Used

Current Patterns

Recommended Additional Patterns

🚀 Milestone Readiness Assessment

M1: Foundation & Core Runtime (40% Complete)

M2: Cloud Infrastructure (Not Started)

M3: API Versioning (Not Started)

🎯 Recommended Next Steps

Immediate (This Week)

Short-Term (Next 2 Weeks)

Medium-Term (Month 1)

📈 Performance Considerations

Current Performance Profile

🔒 Security Considerations

Current Security Posture

📚 Documentation Needs

Current Documentation

🎉 Conclusion

Critical Path Forward

Success Metrics