fenrir-framework 1.1.0

A hybrid Python web framework combining Flask, FastAPI, Bottle, Falcon, and Sanic

Fenrir Web Framework

Fenrir is a state-of-the-art, high-performance, hybrid Python web framework built on top of modern ASGI specifications. It elegantly merges the best programming paradigms from Python's most popular web frameworks (Flask, FastAPI, Sanic, Falcon, and Bottle) into a single unified workspace, powered locally by the premium Asteri v2.2.2 application server.

Whether you prefer the automatic Pydantic validation of FastAPI, the seamless context-locals of Flask, the raw class-based speed of Falcon, or the robust background task model of Sanic, Fenrir allows you to leverage them all simultaneously in the same codebase.

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🌟 Key Features

• ⚡ High-Speed ASGI Core: Extremely low-overhead routing and handler pipeline, achieving massive request throughput.
• 🧩 Framework Hybridization:
  • FastAPI Paradigm: Native Pydantic v2 data validation, Annotated type decorators, automated parameter resolution (Query, Path, Header, Cookie, Body), dynamic dependency injection (Depends), and automated response_model serialization.
  • Flask Paradigm: Thread/Task-safe context locals (request, g, session), Jinja2 template rendering (render_template), and request teardown hooks.
  • Falcon Paradigm: Class-based resource controllers (on_get, on_post), before/after hooks, and in-place response mutation.
  • Sanic Paradigm: Global sys.modules patching (install_sanic_compat()), standard response helpers (json, text, html, raw, redirect), lifecycle listeners (before_server_start, etc.), and a background event scheduler (app.add_task).
  • Bottle Paradigm: Built-in WSGI-to-ASGI wrapper and legacy mount adapter (app.mount_wsgi()) to run old WSGI applications at ASGI speeds.
• 📖 Auto-Generated OpenAPI Docs: Interactive Swagger UI (/docs) and ReDoc (/redoc) instantly generated from your Pydantic schemas and route metadata.
• 🔌 Modern Communications: Out-of-the-box support for WebSockets and Server-Sent Events (SSE).
• 🛠️ Premium CLI Tooling: Visual route tables, interactive app shell, in-memory benchmarking suite, project scaffolding, and environment system inspection.

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📦 Installation

To install Fenrir in development mode, clone the repository and run:

pip install -e .

To install all optimal development and testing dependencies:

pip install pytest httpx watchdog pydantic jinja2 asteri>=2.2.2

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🚀 Quick Start (The Hybrid Power)

Here is a simple example (demo_app.py) showcasing how Flask, FastAPI, Falcon, and Sanic styles coexist harmoniously in a single application:

import logging
from pydantic import BaseModel
from fenrir import (
    Fenrir, Blueprint, request, g, Depends, Query, Header,
    render_template, Response, Form, File, UploadFile,
    WebSocket, WebSocketDisconnect
)

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger("demo")

# Initialize the Hybrid App
app = Fenrir(title="Fenrir Hybrid Demo", version="1.0.0")

# --- 1. FastAPI-Style Validation & DI ---
class UserRegister(BaseModel):
    username: str
    email: str
    age: int

async def verify_api_key(x_api_key: str = Header(default=None)):
    if x_api_key != "super-secret-key":
        logger.warning("Invalid API key attempt")
    return x_api_key

# --- 2. Flask-Style Routing & Context-Locals ---
@app.get("/")
async def home():
    name = request.args.get("name", "Fenrir Developer")
    return render_template("index.html", name=name)

# --- 3. Falcon-Style Class-Based Resources ---
class ItemResource:
    async def on_get(self, req, resp, item_id: int):
        resp.status = 200
        resp.media = {"item_id": item_id, "style": "Falcon Resource"}

app.add_route("/items/<item_id:int>", ItemResource())

# --- 4. Sanic-Style Listeners & Background Tasks ---
@app.listener("before_server_start")
async def setup_db(app_instance):
    logger.info("Initializing mock database...")

@app.middleware("request")
async def log_request(req):
    logger.info(f"Incoming: {req.method} {req.path}")
    g.user_role = "guest"  # Share state using Flask-style 'g'

# Run with Asteri ASGI server
if __name__ == "__main__":
    app.run(host="127.0.0.1", port=8000, workers=2)

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💻 CLI Command Reference

Fenrir comes packed with a high-fidelity, visually rich command-line tool. Start the CLI by executing fenrir or python -m fenrir.cli.

1. fenrir run

Serve your application locally. Powered by Asteri v2.2.2, supporting dynamic multiprocessing, worker management, and live hot-reloading.

fenrir run demo_app:app --port 8000 --dev

• Flags:
  • -H, --host: Host bind address (default: 127.0.0.1).
  • -p, --port: Port number (default: 8000).
  • -w, --workers: Number of concurrent workers (default: 1).
  • -d, --dev / --reload: Active development mode with auto-reload.

2. fenrir routes

Print a beautiful, colorized structural table of all registered HTTP endpoints, methods, matching handlers, and associated blueprints.

fenrir routes demo_app:app

Output Example:

----------------------------------------------------------------
Path                  Methods        Handler           Blueprint
----------------------------------------------------------------
/openapi.json         GET, OPTIONS   openapi_endpoint  -        
/docs                 GET, OPTIONS   swagger_ui        -        
/                     GET, OPTIONS   home              -        
/items/<item_id:int>  GET, POST      ItemResource      -        
/api/register         OPTIONS, POST  register_user     api      
/ws/chat              WEBSOCKET      chat_ws           -        
----------------------------------------------------------------

3. fenrir shell

Instantly spawn an interactive python shell pre-configured with all key framework classes and context loaded (app, request, g, Response, Blueprint, etc.).

fenrir shell demo_app:app

4. fenrir bench

Perform in-memory framework benchmarking directly over ASGI using HTTPX. Eliminates network noise and tests raw pipeline speed under loaded constraints.

fenrir bench demo_app:app -i 1000 -t 5 -p / -m GET

5. fenrir new

Scaffold a complete, cleanly structured template of a new Fenrir project directory in seconds.

fenrir new my_new_project

6. fenrir info

Inspect the environment including Python details, OS details, Pydantic/Asteri versions, active compatibility layers, and route statistics.

fenrir info demo_app:app

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🧪 Comprehensive Test Suite

Fenrir is thoroughly covered by an automated test suite comprising 478 tests validating every single component, compat namespace, file upload, routing detail, and CLI functionality.

Run the test suite using pytest:

pytest -v

Output:

======================== 477 passed, 1 skipped in 3.48s ========================

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🛠️ Package Distribution (PyPI Publish Ready)

Fenrir is packed and ready for distribution.

1. Build the distribution binaries:

   python -m build
   

2. Upload to PyPI using twine:

   python -m twine upload dist/*
   

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📜 License

Fenrir is open-sourced software licensed under the MIT License.