netius

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.

Installation

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.

Usage

WSGI Server

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)

HTTP Client

Synchronous usage

import netius.clients
result = netius.clients.HTTPClient.get_s(
    \"http://www.f**lic*kr.com/\",
    asynchronous = False
)
print(result[\"data\"])

Asynchronous usage

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.f**lic*kr.com/\",
    callback = on_message,
    on_data = on_partial
)

Test servers

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

Learn more

Basic

• Configuration – how to configure your server/client

Advanced topics

More information can be found in the Advanced Topics page.

License

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

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