Fast and readable async non-blocking network apps

Netius is a Python network library that can be used for the rapid creation of asynchronous, non-blocking servers and clients. It has no dependencies, it's cross-platform, and brings some sample netius-powered servers out of the box, namely a production-ready WSGI server.

Simplicity and performance are the main drivers of this project. The codebase adheres to rigorous code standards and is extensively commented on. As far as performance is concerned, it aims to be up to par with equivalent native implementations, where PyPy can provide the extra boost to raise performance up to these standards.

Bear in mind that although netius is non-blocking, it will naturally still block if the operations performed within the event loop are blocking, like reading or writing a file, which are both blocking operations in the Python standard library. Running multiple netius instances in parallel, and having a fast server like NGINX acts as their reverse proxy, which is one way of minimizing the perceptibility of such blockages.

pip install netius

Or download the source from GitHub.

Netius has no dependencies and is, therefore cross-platform. It's compatible with PyPy, with which its benefits of performance increase up to 1.5x - 2.5x faster in most environments when compared with running it with the CPython interpreter.

import netius.servers

def app(environ, start_response):
    status = "200 OK"
    contents = "Hello World"
    content_l = len(contents)
    headers = (
        ("Content-Length", content_l),
        ("Content-Type", "text/plain"),
        ("Connection", "keep-alive")
    )
    start_response(status, headers)
    yield contents

server = netius.servers.WSGIServer(app = app)
server.serve(port = 8080)

import netius.clients
result = netius.clients.HTTPClient.get_s(
    "http://www.flickr.com/",
    asynchronous = False
)
print(result["data"])

import netius.clients

def on_partial(client, parser, data):
    print(data)

def on_message(client, parser, message):
    netius.clients.HTTPClient.cleanup_s()

netius.clients.HTTPClient.get_s(
    "http://www.flickr.com/",
    callback = on_message,
    on_data = on_partial
)

The servers that come with netius out-of-the-box, can be tested through the command line:

• Configuration - how to configure your server/client

More information can be found in the Advanced Topics page.

Netius is currently licensed under the Apache License, Version 2.0.