🔐 VaultStream

High-Performance Distributed Digital Signature System
A microservices-based cryptographic infrastructure for secure record signing at scale, built with Go and event-driven architecture.

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✨ Overview

VaultStream is a production-ready distributed system designed for high-throughput digital signature operations. It demonstrates enterprise-grade patterns including event-driven microservices, concurrent processing, and cryptographic best practices.

🎯 Key Features

• 🔑 ECDSA Cryptography - P-256 curve key generation and digital signatures
• ⚡ High Concurrency - Configurable goroutine pools with semaphore-based flow control
• 📊 Batch Processing - Optimized bulk operations with chunking and parallel execution
• 🔄 Event-Driven Architecture - NATS JetStream for reliable message delivery
• 🗄️ Resilient Data Layer - PostgreSQL with Ent ORM and migration support
• 📈 Performance Tuning - Configurable batch sizes and concurrency levels
• 🧪 Production Testing - Integration tests with real database connections

🏗️ Architecture

System Components

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   Keys Service  │    │  Records Service │    │ Signing Service │
│                 │    │                  │    │                 │
│ • ECDSA Key Gen │    │ • Batch Queries  │    │ • Concurrent    │
│ • Key Streaming │    │ • Record Publish │    │   Signing       │
│ • Concurrency   │────┤ • DB Integration │────┤ • Bulk Inserts  │
└─────────────────┘    └──────────────────┘    └─────────────────┘
         │                        │                        │
         └────────────────────────┼────────────────────────┘
                                  │
                    ┌─────────────▼──────────────┐
                    │      NATS JetStream       │
                    │   • Event Streaming       │
                    │   • Durable Consumers     │
                    │   • Message Persistence   │
                    └───────────────────────────┘
                                  │
                      ┌───────────▼────────────┐
                      │      PostgreSQL       │
                      │   • Records Table     │
                      │   • Signatures Table  │
                      │   • ACID Compliance   │
                      └───────────────────────┘

🚀 Quick Start

One-command setup:

make quick-start

This command will:

• ✅ Set up environment configuration
• ✅ Verify prerequisites (Go, Docker, Make)
• ✅ Launch PostgreSQL and NATS infrastructure
• ✅ Seed database with configurable record count
• ✅ Start all microservices concurrently

🎛️ Performance Tuning

Adjust these variables in the generated .env file to observe system behavior at different scales:

BATCH_SIZE=50              # Records per batch (impacts memory vs. throughput)
TOTAL_RECORDS=1000         # Scale of the signing workload
RECORDS_MAX_CONCURRENCY=10 # Parallel batch processing
SIGNER_MAX_CONCURRENCY=8   # Concurrent signature operations

🛠️ Tech Stack

Category	Technology	Purpose
Language	Go 1.18+	High-performance concurrent programming
Message Broker	NATS JetStream	Event streaming with persistence
Database	PostgreSQL	ACID-compliant data storage
ORM	Ent	Type-safe database operations
Cryptography	ECDSA P-256	Industry-standard digital signatures
Containerization	Docker Compose	Local development infrastructure

📊 Data Model

Database Tables

• records - Source data requiring digital signatures
• signatures - Cryptographic signatures with key associations

Message Streams

• records.> - Batch record publishing for signature processing
• keys.> - Cryptographic key distribution and lifecycle management

🔧 Prerequisites

Ensure the following tools are installed:

Tool	Version	Installation
Go	1.18+	golang.org/dl
Docker	20.10+	docs.docker.com/get-docker
Make	Any	Xcode CLI Tools (macOS) or package manager (Linux)

📋 Available Commands

make help          # Show all available commands
make quick-start   # Complete setup and launch
make start         # Launch services (after setup)
make test          # Run integration test suite
make stop          # Stop all services and cleanup
make clean         # Reset volumes and cached data

🔮 Roadmap

Performance & Reliability

• Retry Strategies - Exponential backoff with jitter for transient failures
• Circuit Breakers - Fault tolerance for downstream dependencies
• Metrics & Observability - Prometheus metrics and distributed tracing

Infrastructure & Deployment

• Kubernetes Deployment - Helm charts for container orchestration
• Auto-scaling - Horizontal pod autoscaling based on queue depth
• Health Checks - Comprehensive readiness and liveness probes

Testing & Quality

• Expanded Test Coverage - Unit tests for critical cryptographic functions
• Load Testing - Performance benchmarks under high concurrency
• Security Audit - Formal review of cryptographic implementations

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🏢 Enterprise-Ready Features: Structured logging • Graceful shutdowns • Database migrations • Configuration management • Error handling • Concurrent processing