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API first and forgotten

Translations: en

Description

"API first" principle seems convincing. Anyone who tried implementing it realizes that often the problem is not to design or formally specify the API (with Swagger or other tool). The problem is to keep the specification, servers and clients consistent and easy to maintain for longer. I will talk about what practices you need to remember and which tools are worth to check.

The talk will start with the basics of microservices architecture. I will describe some mistakes we have made that turned our microservices architecture fragile and unmanageable.

I will show how we redesigned our API using Swagger and what principles you should have in mind when doing so. I will also cover technical problems we encountered:

  • how to test that a service implements an API;
  • how to avoid writing validation that is already specified in the swagger file;
  • how to create clients and stub and who should maintain them.

As theory is not enough here, I will also show some tools that help, describe in detail connexion library and show how we used it to implement microservices integration tests @Growbots.

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