genro-asgi 0.6.5

A minimal, stable ASGI foundation - framework-agnostic toolkit for building high-performance web services

Genro ASGI

A minimal ASGI server and application toolkit for building web services with routing, authentication, sessions, and middleware — configured by a Python config.py builder recipe.

What it does

• Serves web applications mounted on URL prefixes (/api/, /shop/, etc.) with config-driven loading
• Authenticates requests via bearer tokens, basic auth, or JWT — O(1) credential lookup, lazy auth for zero overhead on unprotected routes
• Manages sessions with in-memory store, cookie-based reconnection, and user avatars (identity + tags + extensible Bag data)
• Applies middleware at two levels: global (CORS, errors, auth) and per-app (session, cache) with independent chains
• Routes requests via genro-routes with decorator-based routing and auth tag filtering
• Serves static files with StaticRouter and hierarchical resource loading with fallback chains
• Handles WebSocket with the WSX extension protocol for structured request/response messaging
• Exposes MCP endpoints via McpApplication for AI tool integration (Streamable HTTP transport)
• Configures plugins at runtime via the plugin_config web UI (mounted under /_sys/plugin_config/) with persistence to JSON

Installation

pip install genro-asgi            # core
pip install genro-asgi[json]      # + orjson for fast JSON
pip install genro-asgi[dev]       # + test/lint tools

Quick Start

The server boots from a config.py whose ServerConfiguration (a subclass of AsgiConfigBuilder) is rendered onto it. The recipe builds the server tree with the builder API; application classes are imported and passed as objects.

from genro_asgi import AsgiServer

server = AsgiServer("config.py")  # the config.py directory is the server dir
server.run()                      # starts uvicorn on the configured host/port

config.py:

from genro_asgi.config import AsgiConfigBuilder
from shop_app import Application as Shop          # your AsgiApplication subclass


class ServerConfiguration(AsgiConfigBuilder):
    def main(self, root):
        root.server(host="127.0.0.1", port=8000)
        root.middleware(cors=True, auth=True)     # one bool kwarg per middleware
        root.authMiddleware(
            bearer={"api_key": {"token": "sk_live_abc123", "tags": "api,read"}}
        )
        apps = root.applications(default="shop")   # "shop" is served on the empty mount
        apps.application(code="shop", app_class=Shop,
                         middleware={"session": True})
        root.openapi(title="Shop API", version="1.0.0")

Each app derives its URL mount from its code (or "" when it is the collection default), unless it declares an explicit mount. The server demultiplexes on the first path segment; each app does its own routing.

Architecture at a glance

The server is an instance with its own state — no global variables. Every component is an isolated instance connected via semantic parent-child references.

Request flow:

uvicorn → AsgiServer → global middleware (errors → cors → auth)
  → Dispatcher → per-app middleware (session, cache, ...)
    → handler(**query) → Response → ASGI send

Core components

Component	Purpose
AsgiServer	ASGI entry point, loads config, mounts apps, composes BasicAuthMixin
Dispatcher	Resolves handler via router, applies per-app middleware chains
BasicAuthMixin	Server-side auth: server.authenticate(scope), server.verify_credentials()
SessionMiddleware	Per-app session lifecycle: cookie extraction, reconnection, Set-Cookie
Session / Avatar	Session with meta + Bag data + Avatar (identity, tags, extensible data)
MemorySessionStore	In-memory session store with dump/restore for persistence
AsgiApplication	Base class for mountable applications
McpApplication	MCP Streamable HTTP transport for AI tools
StaticRouter	Filesystem-backed static file serving
LocalStorage	Filesystem storage with mount system

Middleware

Middleware	Name	Order	Default
ErrorMiddleware	errors	100	on
LoggingMiddleware	logging	200	off
CORSMiddleware	cors	300	off
AuthMiddleware	auth	400	off
SessionMiddleware	session	450	off
CacheMiddleware	cache	900	off
CompressionMiddleware	compression	900	off

Scope is not a property of a middleware class: a middleware runs globally when the server's middleware(...) section names it, and per-app when an application's own middleware config names it. The same class can serve in either chain; Order sorts each chain independently.

Documentation

Full documentation: https://genro-asgi.readthedocs.io

• Architecture overview
• API reference

Development

git clone https://github.com/genropy/genro-asgi.git
cd genro-asgi
pip install -e .[dev]

pytest                    # run tests
ruff check .              # lint
mypy src                  # type check

License

Copyright 2025-2026 Softwell S.r.l.

Licensed under the Apache License 2.0. See NOTICE for additional attribution.

Links

• GitHub: https://github.com/genropy/genro-asgi
• PyPI: https://pypi.org/project/genro-asgi/
• Documentation: https://genro-asgi.readthedocs.io