Book Image

Python Microservices Development – 2nd edition - Second Edition

By : Simon Fraser, Tarek Ziadé
Book Image

Python Microservices Development – 2nd edition - Second Edition

By: Simon Fraser, Tarek Ziadé

Overview of this book

The small scope and self-contained nature of microservices make them faster, cleaner, and more scalable than code-heavy monolithic applications. However, building microservices architecture that is efficient as well as lightweight into your applications can be challenging due to the complexity of all the interacting pieces. Python Microservices Development, Second Edition will teach you how to overcome these issues and craft applications that are built as small standard units using proven best practices and avoiding common pitfalls. Through hands-on examples, this book will help you to build efficient microservices using Quart, SQLAlchemy, and other modern Python tools In this updated edition, you will learn how to secure connections between services and how to script Nginx using Lua to build web application firewall features such as rate limiting. Python Microservices Development, Second Edition describes how to use containers and AWS to deploy your services. By the end of the book, you’ll have created a complete Python application based on microservices.
Table of Contents (14 chapters)
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As we learned in Chapter 3, Coding, Testing, and Documentation: the Virtuous Cycle, the biggest challenge when writing functional tests for a service that calls other services is to isolate all network calls. In this section, we'll see how we can mock asynchronous calls made using aiohttp.

Testing aiohttp and its outgoing web requests involves a different approach to traditional synchronous tests. The aioresponses project ( allows you to easily create mocked responses to web requests made using an aiohttp ClientSession:

import asyncio
import aiohttp
import pytest
from aioresponses import aioresponses
def mock_aioresponse():
    with aioresponses() as m:
        yield m
async def test_ctx(mock_aioresponse):
    async with aiohttp.ClientSession() as session:
        mock_aioresponse.get("", payload={"foo": "bar...