Python Microservices Development – 2nd edition by Simon Fraser Tarek Ziadé

Author:Simon Fraser, Tarek Ziadé
Language: eng
Format: epub
Tags: COM060160 - COMPUTERS / Web / Web Programming, COM051360 - COMPUTERS / Programming Languages / Python, COM051230 - COMPUTERS / Software Development & Engineering / General
Publisher: Packt
Published: 2021-09-29T00:50:46+00:00

Let us now see how we can generalize this pattern in a Quart app that needs to interact with other services.

This naive implementation is based on the hypothesis that everything will go smoothly, but real life is rarely so easy. We can set up different error handling options in a ClientSession, such as retries and timeouts, and we only need to set them up in that one place.

Finding out where to go

When we make a web request to a service, we need to know which Uniform Resource Locator (URL) to use. Most of the examples in this book use hardcoded URLs—that is, they are written into the source code. This is nice and easy to read for an example, but can be a problem when maintaining software. What happens when a service gets a new URI, and its hostname or IP address changes? It might move between AWS regions due to a failure or be migrated from Google Cloud Platform to Microsoft Azure. An API update can make the path to a resource change, even if the hostname or IP address has not updated.

We want to pass in data about which URLs to use as configuration to our application. There are several options to manage more configuration options without adding them directly to the code, such as environment variables and service discovery.

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