Creating a GraphQL API in Python: from Django to fully asynchronous
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GraphQL has become one of the hottest web development technologies and is gaining popularity. And there are valid reasons for that! During a workshop held on DjangoConEurope 2019, we presented the basics of building GraphQL servers in Python using Ariadne, a modern and lightweight library (https://github.com/mirumee/ariadne). We started with the most important concepts then worked through creating an example query with a resolver and a mutation. We also wanted to give a sneak peek into Python of the future - asynchronous subscriptions with Ariadne, Django Channels 2.0, Starlette and asynchronous database access!
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Creating a GraphQL API in Python: from Django to fully asynchronous
- 1. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Creating a GraphQL API in Python: from Django to fully asynchronous Marcin Gębala & Patryk Zawadzki DjangoCon Europe 2019
- 2. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE About us Marcin Gębala Python developer @ Mirumee Software, Lead developer @ Saleor github.com/maarcingebala @maarcingebala Patryk Zawadzki Head of Technology @ Mirumee Software, Python developer github.com/patrys @patrys
- 3. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Agenda ■ Saleor ■ GraphQL - core concepts ■ Workshop
- 4. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE https://github.com/mirumee/graphql-workshop
- 5. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Saleor - open-source e-commerce platform Backend: Django + GraphQL API (Graphene) Frontend: TypeScript + Apollo Client + React github.com/mirumee/saleor
- 6. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE ■ Single endpoint, single request ■ Client defines what data to fetch ■ Strong typing ■ Introspection ■ Queries, mutations, subscriptions GraphQL - core concepts
- 7. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Queries ■ Queries allow fetching data from the server. ■ Each query has a resolver - a function that defines how to fetch the data from a data source (any).
- 8. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Mutations ■ Mutations allow modifying data on the server.
- 9. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE ■ A schema file defines the types and operations available in the API. ■ A clear contract between backend and frontend ■ Easy to find usages of particular types Schema
- 10. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Ariadne github.com/mirumee/ariadne Ariadne is a Python library for implementing schema-first GraphQL servers that is simple to use and open for extension. ■ Schema-first approach ■ Inspired by Apollo Server
- 11. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE https://github.com/mirumee/graphql-workshop
- 12. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Intermission: asyncio
- 13. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE Event loop example from Python’s documentation
- 14. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE https://github.com/mirumee/graphql-workshop
- 15. COPYRIGHT © 2009–2019 MIRUMEE SOFTWARE THANK YOU! @maarcingebala @patrys