tps-agent 2.2.0

Comprehensive TPS monitoring and throttling library with database-driven controls

TPS Agent

A comprehensive Python library for measuring, throttling, and managing TPS (Transactions Per Second) in distributed applications. TPS Agent provides flexible strategies for collecting metrics and supports database-driven throttling with Grafana dashboard integration.

✨ Features

Core Functionality

• 🎯 Simple Decorators: @measure_tps, @throttle, @hierarchical_throttle, @db_throttle
• ⚡ Async Support: Works with both sync and async functions
• 🔄 Multiple Strategies: Collector, PostgreSQL, Prometheus, Hybrid strategies
• 📊 Real-time Monitoring: Live metrics collection and visualization
• 🛡️ Intelligent Throttling: Gateway + Endpoint level controls with wait capability

Advanced Features

• 🗄️ Database-driven Limits: Dynamic TPS limits stored in PostgreSQL
• 📈 Grafana Integration: Pre-built dashboards with TPS recommendations
• ⏱️ Wait-on-Limit: Smart waiting up to 30 minutes instead of immediate failures
• 🎛️ Hierarchical Controls: Gateway → Endpoint throttling cascade
• 📋 TPS Recommendations: AI-powered optimal TPS suggestions based on historical data
• 🔧 Zero Configuration: Works out of the box with sensible defaults

📦 Installation

pip install tps-agent

Optional Dependencies

# For PostgreSQL strategy
pip install tps-agent[postgresql]

# For Prometheus integration  
pip install tps-agent[prometheus]

# For all features
pip install tps-agent[all]

🚀 Quick Start

1. Basic Usage with Collector Strategy

from tps_agent import configure_agent, measure_tps, throttle

# Configure once at application startup
configure_agent(
    collector_url="http://tps-collector:8080",
    server_id="web-server-1"
)

@measure_tps(gateway="payment_api")
def process_payment(amount):
    # Your payment processing logic
    return {"status": "success", "amount": amount}

@throttle(gateway="external_api", max_tps=100)
@measure_tps(gateway="external_api")
def call_external_service():
    # This will be throttled to max 100 TPS
    # and metrics will be collected
    return requests.get("https://api.example.com/data")

2. PostgreSQL Strategy with Database-Driven Throttling

from tps_agent import configure_strategy_agent, PostgreSQLStrategy, db_throttle

# Configure PostgreSQL strategy
strategy = PostgreSQLStrategy(
    server_id="web-server-1",
    # Database connection via environment variables
    # TPS_DB_HOST, TPS_DB_PASSWORD, etc.
)
configure_strategy_agent(strategy)

# Database-driven throttling - limits stored in PostgreSQL
@db_throttle(
    gateway="critical-service",
    endpoint="process_payment",
    wait_on_limit=True,        # Wait up to 30 minutes when throttled
    max_wait_seconds=1800
)
def process_critical_payment(amount):
    # TPS limits automatically retrieved from database
    # Defaults to 1000 TPS, configurable via database
    return {"status": "processed", "amount": amount}

3. Hierarchical Throttling

from tps_agent import hierarchical_throttle

@hierarchical_throttle(
    gateway="firmbank-gateway",
    endpoint="withdrawal_transfer",
    gateway_max_tps=200,       # Gateway-level limit
    endpoint_max_tps=50,       # Endpoint-level limit  
    wait_on_limit=True,        # Wait when limits exceeded
    max_wait_seconds=300       # Max 5 minutes wait
)
def withdrawal_transfer(amount, account):
    # Both gateway AND endpoint limits must be satisfied
    return {"status": "transferred", "amount": amount}

🏗️ Architecture

Strategy Pattern

TPS Agent uses a flexible strategy pattern to support different backend systems:

• CollectorStrategy: Send metrics to centralized TPS Collector server
• PostgreSQLStrategy: Store metrics directly in PostgreSQL database
• PrometheusStrategy: Export metrics to Prometheus
• HybridStrategy: Combine multiple strategies

Database Schema (PostgreSQL)

-- Automatic TPS limits management
CREATE TABLE tps_limits (
    gateway VARCHAR(255) NOT NULL,
    endpoint VARCHAR(255),              -- NULL for gateway-level limits
    max_tps INTEGER DEFAULT 1000,
    enabled BOOLEAN DEFAULT true,
    UNIQUE (gateway, endpoint)
);

-- Metrics storage
CREATE TABLE tps_metrics (
    gateway VARCHAR(255) NOT NULL,
    endpoint VARCHAR(255) NOT NULL,
    timestamp TIMESTAMPTZ NOT NULL,
    duration_ms FLOAT NOT NULL,
    success BOOLEAN NOT NULL
);

📊 Grafana Dashboard

TPS Recommendations Dashboard

The PostgreSQL strategy includes pre-built Grafana dashboards with:

• Gateway Statistics: Success rates, request counts, performance metrics
• Endpoint Statistics: Individual endpoint performance analysis
• TPS Recommendations: AI-powered optimal TPS suggestions
  • Ultra Conservative TPS (85% of baseline) 🟢
  • Recommended Optimal TPS (95% of baseline) 🟡
  • Recommended Max TPS (99% of baseline) 🔴
• Real-time Monitoring: Live TPS, response times, error rates

Dashboard Import

{
  "dashboard": "grafana/dashboards/tps-external-db.json",
  "datasource": "PostgreSQL TPS Database"
}

🔧 Configuration

Environment Variables (PostgreSQL Strategy)

# Database Connection
TPS_DB_HOST=localhost
TPS_DB_PORT=5432
TPS_DB_NAME=tps_monitoring
TPS_DB_USER=tps_user
TPS_DB_PASSWORD=your_password

# Agent Settings
TPS_SERVER_ID=web-server-1
TPS_BATCH_SIZE=100
TPS_FLUSH_INTERVAL=30
TPS_MAX_QUEUE_SIZE=10000

Programmatic Configuration

from tps_agent import PostgreSQLStrategy, configure_strategy_agent

strategy = PostgreSQLStrategy(
    server_id="my-service",
    database_url="postgresql://user:pass@localhost/tps_monitoring",
    batch_size=50,
    flush_interval=15,
    max_queue_size=5000
)

# Auto-creates database tables and indexes
configure_strategy_agent(strategy)

💡 Usage Examples

Dynamic TPS Limit Management

# Get current TPS limits
limits = strategy.get_tps_limits(gateway="payment-api")
print(f"Current limits: {limits}")

# Update TPS limits
strategy.update_tps_limit("payment-api", None, 500, True)           # Gateway limit
strategy.update_tps_limit("payment-api", "process_payment", 100, True)  # Endpoint limit

# Get active limits for throttling
active = strategy.get_active_tps_limits()
print(f"Gateway limits: {active['gateway_limits']}")
print(f"Endpoint limits: {active['endpoint_limits']}")

Error Handling

from tps_agent import ThrottleException

@db_throttle(gateway="external-api", wait_on_limit=False)
def call_external_api():
    try:
        return requests.get("https://api.example.com/data")
    except ThrottleException as e:
        logger.warning(f"API throttled: {e}")
        return {"error": "rate_limited", "retry_after": 60}

🧪 Testing

# Run tests
pytest

# With coverage
pytest --cov=tps_agent

# Integration tests (requires PostgreSQL)
pytest tests/integration/

📈 Performance

• Low Overhead: < 1ms per decorated function call
• Efficient Batching: Configurable batch sizes for optimal performance
• Connection Pooling: PostgreSQL strategy uses connection pools
• Async Support: Non-blocking operation with async/await
• Memory Efficient: Automatic cleanup of old metrics

🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🆘 Support

• Documentation: Full Documentation
• Issues: GitHub Issues
• Discussions: GitHub Discussions

🗺️ Roadmap

• Redis Strategy: Redis-based metrics storage and throttling
• Slack Integration: Real-time alerts and TPS limit adjustments
• REST API: HTTP API for managing TPS limits
• Machine Learning: Advanced TPS prediction based on traffic patterns
• Multi-tenant: Support for multiple applications in single instance

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Made with ❤️ for high-performance distributed systems