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Exploring GraphQL Marc-André Giroux @__xuorig__

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@__xuorig__ REST APIs are Great.

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@__xuorig__ Except when they're not.

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@__xuorig__ Multiple round-trips are not ideal.

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@__xuorig__ GET /people/1 GET /planet/2 GET /film/3

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@__xuorig__ SELECT * FROM /ENDPOINT

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@__xuorig__ GET /people/1 { "person": { "name": "luke" } }

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@__xuorig__ { "name": "Luke Skywalker", "height": "172", "mass": "77", "hair_color": "blond", "skin_color": "fair", "eye_color": "blue", "birth_year": "19BBY", "gender": "male", "homeworld": "http://swapi.co/api/ planets/1/", "films": [ "http://swapi.co/api/films/6/", "http://swapi.co/api/films/3/", "http://swapi.co/api/films/2/", "http://swapi.co/api/films/1/", "http://swapi.co/api/films/7/" ],

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@__xuorig__ What do clients even use?

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@__xuorig__ { "name": "Luke Skywalker", "height": "172", "mass": "77", "hair_color": "blond", "skin_color": "fair", "eye_color": "blue", "birth_year": "19BBY", "gender": "male", "homeworld": "http://swapi.co/api/ planets/1/", "films": [ "http://swapi.co/api/films/6/", "http://swapi.co/api/films/3/", "http://swapi.co/api/films/2/", "http://swapi.co/api/films/1/", "http://swapi.co/api/films/7/" ],

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GraphQL

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@__xuorig__ A special type of database.

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@__xuorig__ A library.

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@__xuorig__ A Query Langage.

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@__xuorig__ &

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@__xuorig__ A Spec for servers to execute GraphQL Queries.

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@__xuorig__ A GraphQL Hello World.

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@__xuorig__ query { film { title } }

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@__xuorig__ Anatomy of a GraphQL Query

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@__xuorig__ query MyQuery { film { title } }

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@__xuorig__ query MyQuery { film { title } } Operation Type

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@__xuorig__ query MyQuery { film { title } } Operation Name

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@__xuorig__ query MyQuery { film { title } } Selection Set

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@__xuorig__ query MyQuery { film { title } } Field

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@__xuorig__ • Lexed • Parsed • Validated • Executed

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@__xuorig__ "data": { "film": { "title": "A New Hope" } }

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@__xuorig__ query { film(id: "123") { title } }

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@__xuorig__ query { film(id: "123") { title characters { name } } }

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@__xuorig__ "data": { "film": { "title": "A New Hope", "characters": [ { "name": "Luke Skywalker" }, { "name": "Princess Leia" } ] } }

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@__xuorig__ The Type System.

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@__xuorig__ { film(id: "123") { title characters { name } } }

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@__xuorig__ { film(id: "123") { title characters { name } } } type QueryRoot { film(id: ID!): Film }

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@__xuorig__ { film(id: "123") { title characters { name } } } type Film { title: String! characters: [Character!]! }

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@__xuorig__ { film(id: "123") { title characters { name } } } type Character { name: String! }

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@__xuorig__ Introspection.

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@__xuorig__ { __schema { types { name } } }

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@__xuorig__ { __type(name: "Film") { name description } }

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@__xuorig__ Introspection == Clients with Super Powers

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@__xuorig__ • AutoComplete • Client side validation • IDE Integration • Code Generation

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@__xuorig__ GraphiQL

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@__xuorig__

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@__xuorig__ swapi-graphql-ruby.herokuapp.com

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Mutations

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@__xuorig__ mutation { addFilm(name: "StarWars 8") { title } }

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Fragments

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@__xuorig__ query { film(id: "123") { title characters { name } } bestRatedfilm { title characters { name } } }

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@__xuorig__ query { film(id: "123") { title characters { name } } bestRatedfilm { title characters { name } } }

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@__xuorig__ fragment filmFragment on Film { title characters { name } }

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@__xuorig__ query { film(id: "123") { ...filmFragment } bestRatedfilm { ...filmFragment } } fragment filmFragment on Film { title characters { name } }

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@__xuorig__ Versioning

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@__xuorig__ Versioning Continuous Evolution

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@__xuorig__ What about Security ?

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@__xuorig__ • Maximum Depth • Query Complexity • Timeout

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@__xuorig__ My HTTP Caching :( !

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@__xuorig__ • Client Side Cache • Persisted Queries

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@__xuorig__ GraphQL is Great.

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@__xuorig__ A single roundtrip to fetch exactly what a client needs.

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@__xuorig__ Declarative and predictable. (no more SELECT *)

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@__xuorig__ Servers express possibilities.

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@__xuorig__ Clients define requirements.

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@__xuorig__ That's real separation of concerns!

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@__xuorig__ Great developer experience.

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@__xuorig__ It makes us ship faster.

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@__xuorig__ An everyone is happy.

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Thank you! Marc-André Giroux @__xuorig__