Implemented full native support for Azure Blob Storage and Google Cloud Storage:
**Azure Blob Storage (internal/cloud/azure.go):**
- Native Azure SDK integration (github.com/Azure/azure-sdk-for-go)
- Block blob upload for large files (>256MB with 100MB blocks)
- Azurite emulator support for local testing
- Production Azure authentication (account name + key)
- SHA-256 integrity verification with metadata
- Streaming uploads with progress tracking
**Google Cloud Storage (internal/cloud/gcs.go):**
- Native GCS SDK integration (cloud.google.com/go/storage)
- Chunked upload for large files (16MB chunks)
- fake-gcs-server emulator support for local testing
- Application Default Credentials support
- Service account JSON key file support
- SHA-256 integrity verification with metadata
- Streaming uploads with progress tracking
**Backend Integration:**
- Updated NewBackend() factory to support azure/azblob and gs/gcs providers
- Added Name() methods to both backends
- Fixed ProgressReader usage across all backends
- Updated Config comments to document Azure/GCS support
**Testing Infrastructure:**
- docker-compose.azurite.yml: Azurite + PostgreSQL + MySQL test environment
- docker-compose.gcs.yml: fake-gcs-server + PostgreSQL + MySQL test environment
- scripts/test_azure_storage.sh: 8 comprehensive Azure integration tests
- scripts/test_gcs_storage.sh: 8 comprehensive GCS integration tests
- Both test scripts validate upload/download/verify/cleanup/restore operations
**Documentation:**
- AZURE.md: Complete guide (600+ lines) covering setup, authentication, usage
- GCS.md: Complete guide (600+ lines) covering setup, authentication, usage
- Updated CLOUD.md with Azure and GCS sections
- Updated internal/config/config.go with Azure/GCS field documentation
**Test Coverage:**
- Large file uploads (300MB for Azure, 200MB for GCS)
- Block/chunked upload verification
- Backup verification with SHA-256 checksums
- Restore from cloud URIs
- Cleanup and retention policies
- Emulator support for both providers
**Dependencies Added:**
- Azure: github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.6.3
- GCS: cloud.google.com/go/storage v1.57.2
- Plus transitive dependencies (~50+ packages)
**Build:**
- Compiles successfully: 68MB binary
- All imports resolved
- No compilation errors
Sprint 4 closes the multi-cloud gap identified in Sprint 3 evaluation.
Users can now use Azure and GCS URIs that were previously parsed but unsupported.
Sprint 3 Complete - Cloud Storage Full Implementation:
New Features:
✅ Multipart upload for large files (>100MB)
✅ Automatic part size (10MB) and concurrency (10 parts)
✅ MinIO testing infrastructure
✅ Comprehensive integration test script
✅ Complete cloud storage documentation
New Files:
- CLOUD.md - Complete cloud storage guide (580+ lines)
- docker-compose.minio.yml - MinIO + PostgreSQL + MySQL test setup
- scripts/test_cloud_storage.sh - Full integration test suite
Multipart Upload:
- Automatic for files >100MB
- 10MB part size for optimal performance
- 10 concurrent parts for faster uploads
- Progress tracking for multipart transfers
- AWS S3 Upload Manager integration
Testing Infrastructure:
- docker-compose.minio.yml:
* MinIO S3-compatible storage
* PostgreSQL 16 test database
* MySQL 8.0 test database
* Automatic bucket creation
* Health checks for all services
- test_cloud_storage.sh (14 test scenarios):
1. Service startup and health checks
2. Test database creation with sample data
3. Local backup creation
4. Cloud upload to MinIO
5. Cloud list verification
6. Backup with cloud URI
7. Database drop for restore test
8. Restore from cloud URI
9. Data verification after restore
10. Cloud backup integrity verification
11. Cleanup dry-run test
12. Multiple backups creation
13. Actual cleanup test
14. Large file multipart upload (>100MB)
Documentation (CLOUD.md):
- Quick start guide
- URI syntax documentation
- Configuration methods (4 approaches)
- All cloud commands with examples
- Provider-specific setup (AWS S3, MinIO, B2, GCS)
- Multipart upload details
- Progress tracking
- Metadata synchronization
- Best practices (security, performance, reliability)
- Troubleshooting guide
- Real-world examples
- FAQ section
Sprint 3 COMPLETE!
Total implementation: 100% of requirements met
Cloud storage features now at 100%:
✅ URI parser and support
✅ Backup/restore/verify/cleanup integration
✅ Multipart uploads
✅ Testing infrastructure
✅ Comprehensive documentation
- Removed all test documentation (MASTER_TEST_PLAN, TESTING_SUMMARY, etc.)
- Removed test scripts (create_*_db.sh, test_suite.sh, validation scripts)
- Removed test logs and temporary directories
- Kept only essential: disaster_recovery_test.sh, build_all.sh
- Completely rewrote README.md in conservative professional style
- Clean structure: Focus on usage, configuration, troubleshooting
- Production-ready documentation for end users
