premier 0.4.9

an extendable toolbox for scalable apis

Premier

Premier is a versatile Python toolkit that can be used in three main ways:

1. Lightweight Standalone API Gateway - Run as a dedicated gateway service
2. ASGI App/Middleware - Wrap existing ASGI applications or add as middleware
3. Decorator Mode - Use Premier decorators directly on functions for maximum flexibility

Premier transforms any Python web application into a full-featured API gateway with caching, rate limiting, retry logic, timeouts, and performance monitoring.

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Documentation

• Web Dashboard - Real-time monitoring and configuration management
• Examples - Complete examples and tutorials
• Configuration Guide - YAML configuration reference

Features

Premier provides enterprise-grade API gateway functionality with:

• Response Caching - Smart caching with TTL and custom cache keys
• Rate Limiting - Multiple algorithms (fixed/sliding window, token/leaky bucket), works with distributed app
• Retry Logic - Configurable retry strategies with exponential backoff
• Request Timeouts - Per-path timeout protection
• WebSocket Support - Full WebSocket proxying with rate limiting and monitoring
• Path-Based Policies - Different features per route with regex matching
• Web Dashboard - Built-in web GUI for monitoring and configuration management
• YAML Configuration - Declarative configuration with namespace support

... and more

Why Premier

Premier is designed for simplicity and accessibility - perfect for simple applications that need API gateway functionality without introducing complex tech stacks like Kong, Ambassador, or Istio.

Key advantages:

• Zero Code Changes - Wrap existing ASGI apps without modifications
• Simple Setup - Single dependency, no external services required
• Dual Mode Operation - Plugin for existing apps OR standalone gateway
• Python Native - Built for Python developers, integrates seamlessly
• Lightweight - Minimal overhead, maximum performance
• Hot Reloadable - Update configurations without restarts

Quick Start

Plugin Mode (Recommended)

How it works: Each app instance has its own Premier gateway wrapper

┌─────────────────────────────────────────────────────────────┐
│ App Instance 1                                              │
│ ┌─────────────────┐    ┌─────────────────────────────────┐  │
│ │   Premier       │────│       Your ASGI App             │  │
│ │   Gateway       │    │     (FastAPI/Django/etc)        │  │
│ │  ┌──────────┐   │    │                                 │  │
│ │  │Cache     │   │    │  @app.get("/api/users")         │  │
│ │  │RateLimit │   │    │  async def get_users():         │  │
│ │  │Retry     │   │    │      return users               │  │
│ │  │Timeout   │   │    │                                 │  │
│ │  └──────────┘   │    │                                 │  │
│ └─────────────────┘    └─────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────┘

You can keep your existing app.py file untouched

# app.py
from premier.asgi import ASGIGateway, GatewayConfig
from fastapi import FastAPI

# Your existing app - no changes needed
app = FastAPI()

@app.get("/api/users/{user_id}")
async def get_user(user_id: int):
    return await fetch_user_from_database(user_id)

Next, import your app instance and wrap it with ASGIGateway:

# gateway.py
from .app import app
# Load configuration and wrap app
config = GatewayConfig.from_file("gateway.yaml")
app = ASGIGateway(config=config, app=app)

Then, instead of serving the original app directly, serve the one wrapped with ASGIGateway.

Standalone Mode

How it works: Single gateway handles all requests and forwards to backend services

                        ┌─────────────────────┐
    Client Request      │   Premier Gateway   │
         │              │  ┌──────────────┐   │
         │              │  │ Cache        │   │
         └──────────────►  │ RateLimit    │   │
                        │  │ Retry        │   │
                        │  │ Timeout      │   │
                        │  │ Monitoring   │   │
                        │  └──────────────┘   │
                        └─────┬──────┬────────┘
                              │      │
                    ┌─────────┘      └─────────┐
                    ▼                          ▼
            ┌───────────────┐          ┌───────────────┐
            │   Backend 1   │          │   Backend 2   │
            │ (Any Service) │          │ (Any Service) │
            │               │          │               │
            │ Node.js API   │          │  Python API   │
            │ Java Service  │          │  .NET Service │
            │ Static Files  │          │  Database     │
            └───────────────┘          └───────────────┘

# main.py
from premier.asgi import ASGIGateway, GatewayConfig

config = GatewayConfig.from_file("gateway.yaml")
gateway = ASGIGateway(config, servers=["http://backend:8000"])

uvicorn src:main

Decorator Mode

How it works: Apply Premier features directly to individual functions with decorators - no ASGI app required

WebSocket Support

Premier supports WebSocket connections with the same feature set:

# WebSocket connections are automatically handled
# Configure WebSocket-specific policies in YAML:

premier:
  paths:
    - pattern: "/ws/chat/*"
      features:
        rate_limit:
          quota: 100  # Max 100 connections per minute
          duration: 60
        monitoring:
          log_threshold: 5.0  # Log connections lasting >5s

YAML Configuration

Configure gateway policies declaratively:

premier:
  keyspace: "my-api"
  
  paths:
    - pattern: "/api/users/*"
      features:
        cache:
          expire_s: 300
        rate_limit:
          quota: 100
          duration: 60
          algorithm: "sliding_window"
        timeout:
          seconds: 5.0
        retry:
          max_attempts: 3
          wait: 1.0
        monitoring:
          log_threshold: 0.1
    
    - pattern: "/api/admin/*"
      features:
        rate_limit:
          quota: 10
          duration: 60
          algorithm: "token_bucket"
        timeout:
          seconds: 30.0
    
    - pattern: "/ws/*"
      features:
        rate_limit:
          quota: 50
          duration: 60
          algorithm: "sliding_window"
        monitoring:
          log_threshold: 1.0
  
  default_features:
    timeout:
      seconds: 10.0
    monitoring:
      log_threshold: 0.5

Installation

pip install premier

For Redis support (optional):

pip install premier[redis]

Function Resilience Decorators

Premier includes powerful decorators for adding resilience to individual functions:

Retry Decorator

from premier.retry import retry

@retry(max_attempts=3, wait=1.0, exceptions=(ConnectionError, TimeoutError))
async def api_call():
    # Your function with retry logic
    return await make_request()

Timer Decorator

from premier.timer import timeit, timeout

@timeit(log_threshold=0.1)  # Log calls taking >0.1s
async def slow_operation():
    return await heavy_computation()

@timeout(seconds=5)  # Timeout after 5 seconds
async def time_limited_task():
    return await long_running_operation()

Framework Integration

Works with any ASGI framework:

# FastAPI
from fastapi import FastAPI
app = FastAPI()

# Starlette
from starlette.applications import Starlette
app = Starlette()

# Django ASGI
from django.core.asgi import get_asgi_application
app = get_asgi_application()

# Wrap with Premier
config = GatewayConfig.from_file("config.yaml")
gateway = ASGIGateway(config, app=app)

Production Deployment

# production.py
from premier.asgi import ASGIGateway, GatewayConfig
from premier.providers.redis import AsyncRedisCache
from redis.asyncio import Redis

# Redis backend for distributed caching
redis_client = Redis.from_url("redis://localhost:6379")
cache_provider = AsyncRedisCache(redis_client)

# Load configuration
config = GatewayConfig.from_file("production.yaml")

# Create production gateway
gateway = ASGIGateway(config, app=your_app, cache_provider=cache_provider)

# Deploy with uvicorn
if __name__ == "__main__":
    import uvicorn
    uvicorn.run(gateway, host="0.0.0.0", port=8000, workers=4)

Requirements

• Python >= 3.10
• Redis >= 5.0.3 (optional, for distributed deployments)
• PyYAML (for YAML configuration)
• aiohttp (optional, for standalone mode)

What's Next

• Web GUI
• Websocket Support
• Load Balancer
• Circuit Breaker
• Auth(OAuth, jwt, etc.)
• MCP integration

License

MIT License