smarts3/production-readiness.md

# Production-Readiness Plan for smarts3

**Goal:** Make smarts3 production-ready as a MinIO alternative for use cases where:
- Running MinIO is out of scope
- You have a program written for S3 and want to use the local filesystem
- You need a lightweight, zero-dependency S3-compatible server

---

## 🔍 Current State Analysis

### ✅ What's Working

- **Native S3 server** with zero framework dependencies
- **Core S3 operations:** PUT, GET, HEAD, DELETE (objects & buckets)
- **List buckets and objects** (V1 and V2 API)
- **Object copy** with metadata handling
- **Range requests** for partial downloads
- **MD5 checksums** and ETag support
- **Custom metadata** (x-amz-meta-*)
- **Filesystem-backed storage** with Windows compatibility
- **S3-compatible XML error responses**
- **Middleware system** and routing
- **AWS SDK v3 compatibility** (tested)

### ❌ Production Gaps Identified

---

## 🎯 Critical Features (Required for Production)

### 1. Multipart Upload Support 🚀 **HIGHEST PRIORITY**

**Why:** Essential for uploading files >5MB efficiently. Without this, smarts3 can't handle real-world production workloads.

**Implementation Required:**
- `POST /:bucket/:key?uploads` - CreateMultipartUpload
- `PUT /:bucket/:key?partNumber=X&uploadId=Y` - UploadPart
- `POST /:bucket/:key?uploadId=X` - CompleteMultipartUpload
- `DELETE /:bucket/:key?uploadId=X` - AbortMultipartUpload
- `GET /:bucket/:key?uploadId=X` - ListParts
- Multipart state management (temp storage for parts)
- Part ETag tracking and validation
- Automatic cleanup of abandoned uploads

**Files to Create/Modify:**
- `ts/controllers/multipart.controller.ts` (new)
- `ts/classes/filesystem-store.ts` (add multipart methods)
- `ts/classes/smarts3-server.ts` (add multipart routes)

---

### 2. Configurable Authentication 🔐

**Why:** Currently hardcoded credentials ('S3RVER'/'S3RVER'). Production needs custom credentials.

**Implementation Required:**
- Support custom access keys and secrets via configuration
- Implement AWS Signature V4 verification
- Support multiple credential pairs (IAM-like users)
- Optional: Disable authentication for local dev use

**Configuration Example:**
```typescript
interface IAuthConfig {
  enabled: boolean;
  credentials: Array<{
    accessKeyId: string;
    secretAccessKey: string;
  }>;
  signatureVersion: 'v4' | 'none';
}
```

**Files to Create/Modify:**
- `ts/classes/auth-middleware.ts` (new)
- `ts/classes/signature-validator.ts` (new)
- `ts/classes/smarts3-server.ts` (integrate auth middleware)
- `ts/index.ts` (add auth config options)

---

### 3. CORS Support 🌐

**Why:** Required for browser-based uploads and modern web apps.

**Implementation Required:**
- Add CORS middleware
- Support preflight OPTIONS requests
- Configurable CORS origins, methods, headers
- Per-bucket CORS configuration (optional)

**Configuration Example:**
```typescript
interface ICorsConfig {
  enabled: boolean;
  allowedOrigins: string[]; // ['*'] or ['https://example.com']
  allowedMethods: string[]; // ['GET', 'POST', 'PUT', 'DELETE']
  allowedHeaders: string[]; // ['*'] or specific headers
  exposedHeaders: string[]; // ['ETag', 'x-amz-*']
  maxAge: number; // 3600 (seconds)
  allowCredentials: boolean;
}
```

**Files to Create/Modify:**
- `ts/classes/cors-middleware.ts` (new)
- `ts/classes/smarts3-server.ts` (integrate CORS middleware)
- `ts/index.ts` (add CORS config options)

---

### 4. SSL/TLS Support 🔒

**Why:** Production systems require encrypted connections.

**Implementation Required:**
- HTTPS server option with cert/key configuration
- Auto-redirect HTTP to HTTPS (optional)
- Support for self-signed certs in dev mode

**Configuration Example:**
```typescript
interface ISslConfig {
  enabled: boolean;
  cert: string; // Path to certificate file or cert content
  key: string; // Path to key file or key content
  ca?: string; // Optional CA cert
  redirectHttp?: boolean; // Redirect HTTP to HTTPS
}
```

**Files to Create/Modify:**
- `ts/classes/smarts3-server.ts` (add HTTPS server creation)
- `ts/index.ts` (add SSL config options)

---

### 5. Production Configuration System ⚙️

**Why:** Production needs flexible configuration, not just constructor options.

**Implementation Required:**
- Support configuration file (JSON/YAML)
- Environment variable support
- Configuration validation
- Sensible production defaults
- Example configurations for common use cases

**Configuration File Example (`smarts3.config.json`):**
```json
{
  "server": {
    "port": 3000,
    "address": "0.0.0.0",
    "ssl": {
      "enabled": true,
      "cert": "./certs/server.crt",
      "key": "./certs/server.key"
    }
  },
  "storage": {
    "directory": "./s3-data",
    "cleanSlate": false
  },
  "auth": {
    "enabled": true,
    "credentials": [
      {
        "accessKeyId": "AKIAIOSFODNN7EXAMPLE",
        "secretAccessKey": "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"
      }
    ]
  },
  "cors": {
    "enabled": true,
    "allowedOrigins": ["*"],
    "allowedMethods": ["GET", "POST", "PUT", "DELETE", "HEAD"],
    "allowedHeaders": ["*"]
  },
  "limits": {
    "maxObjectSize": 5368709120,
    "maxMetadataSize": 2048,
    "requestTimeout": 300000
  },
  "logging": {
    "level": "info",
    "format": "json",
    "accessLog": {
      "enabled": true,
      "path": "./logs/access.log"
    },
    "errorLog": {
      "enabled": true,
      "path": "./logs/error.log"
    }
  }
}
```

**Files to Create/Modify:**
- `ts/classes/config-loader.ts` (new)
- `ts/classes/config-validator.ts` (new)
- `ts/index.ts` (use config loader)
- Create example config files in root

---

### 6. Production Logging 📝

**Why:** Console logs aren't suitable for production monitoring.

**Implementation Required:**
- Structured logging (JSON format option)
- Log levels (ERROR, WARN, INFO, DEBUG)
- File rotation support
- Access logs (S3 standard format)
- Integration with logging library

**Files to Create/Modify:**
- `ts/classes/logger.ts` (new - use @push.rocks/smartlog?)
- `ts/classes/access-logger-middleware.ts` (new)
- `ts/classes/smarts3-server.ts` (replace console.log with logger)
- All controller files (use structured logging)

---

## 🔧 Important Features (Should Have)

### 7. Health Check & Metrics 💊

**Implementation Required:**
- `GET /_health` endpoint (non-S3, for monitoring)
- `GET /_metrics` endpoint (Prometheus format?)
- Server stats (requests/sec, storage used, uptime)
- Readiness/liveness probes for Kubernetes

**Files to Create/Modify:**
- `ts/controllers/health.controller.ts` (new)
- `ts/classes/metrics-collector.ts` (new)
- `ts/classes/smarts3-server.ts` (add health routes)

---

### 8. Batch Operations 📦

**Implementation Required:**
- `POST /:bucket?delete` - DeleteObjects (delete multiple objects in one request)
- Essential for efficient cleanup operations

**Files to Create/Modify:**
- `ts/controllers/object.controller.ts` (add deleteObjects method)

---

### 9. Request Size Limits & Validation 🛡️

**Implementation Required:**
- Max object size configuration
- Max metadata size limits
- Request timeout configuration
- Body size limits
- Bucket name validation (S3 rules)
- Key name validation

**Files to Create/Modify:**
- `ts/classes/validation-middleware.ts` (new)
- `ts/utils/validators.ts` (new)
- `ts/classes/smarts3-server.ts` (integrate validation middleware)

---

### 10. Conditional Requests 🔄

**Implementation Required:**
- If-Match / If-None-Match (ETag validation)
- If-Modified-Since / If-Unmodified-Since
- Required for caching and conflict prevention

**Files to Create/Modify:**
- `ts/controllers/object.controller.ts` (add conditional logic to GET/HEAD)

---

### 11. Graceful Shutdown 👋

**Implementation Required:**
- Drain existing connections
- Reject new connections
- Clean multipart cleanup on shutdown
- SIGTERM/SIGINT handling

**Files to Create/Modify:**
- `ts/classes/smarts3-server.ts` (add graceful shutdown logic)
- `ts/index.ts` (add signal handlers)

---

## 💡 Nice-to-Have Features

### 12. Advanced Features

- Bucket versioning support
- Object tagging
- Lifecycle policies (auto-delete old objects)
- Storage class simulation (STANDARD, GLACIER, etc.)
- Server-side encryption simulation
- Presigned URL support (for time-limited access)

### 13. Performance Optimizations

- Stream optimization for large files
- Optional in-memory caching for small objects
- Parallel upload/download support
- Compression support (gzip)

### 14. Developer Experience

- Docker image for easy deployment
- Docker Compose examples
- Kubernetes manifests
- CLI for server management
- Admin API for bucket management

---

## 📐 Implementation Phases

### Phase 1: Critical Production Features (Priority 1)

**Estimated Effort:** 2-3 weeks

1. ✅ Multipart uploads (biggest technical lift)
2. ✅ Configurable authentication
3. ✅ CORS middleware
4. ✅ Production configuration system
5. ✅ Production logging

**Outcome:** smarts3 can handle real production workloads

---

### Phase 2: Reliability & Operations (Priority 2)

**Estimated Effort:** 1-2 weeks

6. ✅ SSL/TLS support
7. ✅ Health checks & metrics
8. ✅ Request validation & limits
9. ✅ Graceful shutdown
10. ✅ Batch operations

**Outcome:** smarts3 is operationally mature

---

### Phase 3: S3 Compatibility (Priority 3)

**Estimated Effort:** 1-2 weeks

11. ✅ Conditional requests
12. ✅ Additional S3 features as needed
13. ✅ Comprehensive test suite
14. ✅ Documentation updates

**Outcome:** smarts3 has broad S3 API compatibility

---

### Phase 4: Polish (Priority 4)

**Estimated Effort:** As needed

15. ✅ Docker packaging
16. ✅ Performance optimization
17. ✅ Advanced features based on user feedback

**Outcome:** smarts3 is a complete MinIO alternative

---

## 🤔 Open Questions

1. **Authentication:** Do you want full AWS Signature V4 validation, or simpler static credential checking?
2. **Configuration:** Prefer JSON, YAML, or .env file format?
3. **Logging:** Do you have a preferred logging library, or shall I use @push.rocks/smartlog?
4. **Scope:** Should we tackle all of Phase 1, or start with a subset (e.g., just multipart + auth)?
5. **Testing:** Should we add comprehensive tests as we go, or batch them at the end?
6. **Breaking changes:** Can I modify the constructor options interface, or must it remain backward compatible?

---

## 🎯 Target Use Cases

**With this plan implemented, smarts3 will be a solid MinIO alternative for:**

✅ **Local S3 development** - Fast, simple, no Docker required
✅ **Testing S3 integrations** - Reliable, repeatable tests
✅ **Microservices using S3 API** with filesystem backend
✅ **CI/CD pipelines** - Lightweight S3 for testing
✅ **Small-to-medium production deployments** where MinIO is overkill
✅ **Edge computing** - S3 API for local file storage
✅ **Embedded systems** - Minimal dependencies, small footprint

---

## 📊 Current vs. Production Comparison

| Feature | Current | After Phase 1 | After Phase 2 | Production Ready |
|---------|---------|---------------|---------------|------------------|
| Basic S3 ops | ✅ | ✅ | ✅ | ✅ |
| Multipart upload | ❌ | ✅ | ✅ | ✅ |
| Authentication | ⚠️ (hardcoded) | ✅ | ✅ | ✅ |
| CORS | ❌ | ✅ | ✅ | ✅ |
| SSL/TLS | ❌ | ❌ | ✅ | ✅ |
| Config files | ❌ | ✅ | ✅ | ✅ |
| Production logging | ⚠️ (console) | ✅ | ✅ | ✅ |
| Health checks | ❌ | ❌ | ✅ | ✅ |
| Request limits | ❌ | ❌ | ✅ | ✅ |
| Graceful shutdown | ❌ | ❌ | ✅ | ✅ |
| Conditional requests | ❌ | ❌ | ❌ | ✅ |
| Batch operations | ❌ | ❌ | ✅ | ✅ |

---

## 📝 Notes

- All features should maintain backward compatibility where possible
- Each feature should include comprehensive tests
- Documentation (readme.md) should be updated as features are added
- Consider adding a migration guide for users upgrading from testing to production use
- Performance benchmarks should be established and maintained

---

**Last Updated:** 2025-11-23
**Status:** Planning Phase
**Next Step:** Get approval and prioritize implementation order