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https://github.com/ermadmi78/kobby

Kobby is a codegen plugin of Kotlin DSL Client by GraphQL schema. The generated DSL supports execution of complex GraphQL queries, mutation and subscriptions in Kotlin with syntax similar to native GraphQL syntax.
https://github.com/ermadmi78/kobby

client code-generation dsl gradle gradle-plugin graphql graphql-client graphql-schema graphql-subscriptions kotlin kotlin-dsl kotlin-multiplatform kotlin-native maven maven-plugin multiplatform plugin

Last synced: 2 months ago
JSON representation

Host: GitHub
URL: https://github.com/ermadmi78/kobby
Owner: ermadmi78
License: apache-2.0
Created: 2020-10-17T17:29:21.000Z (about 4 years ago)
Default Branch: main
Last Pushed: 2024-09-12T11:10:32.000Z (3 months ago)
Last Synced: 2024-09-28T21:22:28.653Z (2 months ago)
Topics: client, code-generation, dsl, gradle, gradle-plugin, graphql, graphql-client, graphql-schema, graphql-subscriptions, kotlin, kotlin-dsl, kotlin-multiplatform, kotlin-native, maven, maven-plugin, multiplatform, plugin
Language: Kotlin
Homepage:
Size: 2.41 MB
Stars: 80
Watchers: 7
Forks: 4
Open Issues: 0
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md

Awesome Lists containing this project

awesome-graphql-java - Kobby - academy.com/how-to-generate-kotlin-dsl-client-by-graphql-schema-707fd0c55284) by GraphQL schema. The generated DSL supports execution of complex GraphQL queries, mutation and subscriptions in Kotlin with syntax similar to native GraphQL syntax. (Schema Libraries / Schema First)

README

        [![License](https://img.shields.io/badge/License-Apache%202.0-brightgreen)](https://github.com/ermadmi78/kobby/blob/main/LICENSE)

[![Plugin Portal](https://img.shields.io/badge/Plugin%20Portal-v4.1.0-orange)](https://plugins.gradle.org/plugin/io.github.ermadmi78.kobby)

[![Maven Central](https://img.shields.io/badge/Maven%20Central-v4.1.0-orange)](https://search.maven.org/artifact/io.github.ermadmi78/kobby-maven-plugin)

[![Discussions](https://img.shields.io/badge/Discussions-On%20GitHub-blue)](https://github.com/ermadmi78/kobby/discussions)

[![alt text](https://github.com/ermadmi78/kobby/blob/main/images/simple_query.png)](https://github.com/ermadmi78/kobby/wiki)

Kobby is a codegen plugin of Kotlin DSL Client by GraphQL schema. The generated DSL supports execution of complex

GraphQL queries, mutations and subscriptions in Kotlin with syntax similar to native GraphQL syntax. Moreover, you can

customize generated DSL by means of GraphQL schema directives and Kotlin extension functions.

### Documentation

* [Kobby Documentation](https://github.com/ermadmi78/kobby/wiki)

### Tutorials

* [How to generate Kotlin DSL Client by GraphQL schema](https://blog.kotlin-academy.com/how-to-generate-kotlin-dsl-client-by-graphql-schema-707fd0c55284)

* [Генерируем Kotlin клиент по GraphQL схеме](https://habr.com/ru/articles/587388/)

* [Kobby Gradle Tutorial](https://github.com/ermadmi78/kobby-gradle-tutorial)

* [Kobby Maven Tutorial](https://github.com/ermadmi78/kobby-maven-tutorial)

### Kotlin Multiplatform

Kobby [supports](https://github.com/ermadmi78/kobby/wiki/Gradle-Kotlinx-Serialization-Support) Kotlinx Serialization

to provide an ability to generate Kotlin Multiplatform GraphQL DSL Client since

release [3.0.0](https://github.com/ermadmi78/kobby/releases/tag/3.0.0).

### Requirements

#### Kobby 4.x.x

* Gradle at least version 8.0 is required.

* Maven at least version 3.9.1 is required.

* Kotlin at least version 1.8.0 is required to compile generated client DSL (use Kobby at least [4.0.1](https://github.com/ermadmi78/kobby/releases/tag/4.0.1) for Kotlin 2.x).

* Kotlinx Serialization at least version 1.5.0 is required.

* Ktor at least version 2.0.0 is required to generate default adapters.

* [graphql-ws](https://github.com/enisdenjo/graphql-ws) GraphQL Websocket protocol.

#### Kobby 3.x.x

* Gradle at least version 8.0 is required.

* Maven at least version 3.9.1 is required.

* Kotlin at least version 1.8.0 is required to compile generated client DSL.

* Kotlinx Serialization at least version 1.5.0 is required.

* Ktor at least version 2.0.0 is required to generate default adapters.

* [subscriptions-transport-ws](https://github.com/apollographql/subscriptions-transport-ws) GraphQL Websocket protocol (is legacy now).

#### Kobby 2.x.x

* Gradle at least version 7.0 is required.

* Maven at least version 3.6.3 is required.

* Kotlin at least version 1.6 is required to compile generated client DSL.

* Ktor at least version 2.0.0 is required to generate default adapters.

* [subscriptions-transport-ws](https://github.com/apollographql/subscriptions-transport-ws) GraphQL Websocket protocol (is legacy now).

#### Kobby 1.x.x

* Gradle at least version 7.0 is required.

* Maven at least version 3.6.3 is required.

* Kotlin at least version 1.5 is required to compile generated client DSL.

* 1.5.0 <= Ktor version < 2.0.0 is required to generate default adapters.

* [subscriptions-transport-ws](https://github.com/apollographql/subscriptions-transport-ws) GraphQL Websocket protocol (is legacy now).

### Contributing

Please see [CONTRIBUTING.md](CONTRIBUTING.md)

### Gradle

```kotlin

plugins {

    id("io.github.ermadmi78.kobby") version "4.1.0"

}

```

### Maven

```xml

    

        

            io.github.ermadmi78

            kobby-maven-plugin

            4.1.0

            

                

                    generate-sources

                    

                        generate-kotlin

                    

                

            

        

    

```

### Define your GraphQL schema

Put your GraphQL schema file in the project resources with `graphqls` extension. For example, let define

[cinema.graphqls](https://github.com/ermadmi78/kobby-gradle-example/blob/main/cinema-api/src/main/resources/io/github/ermadmi78/kobby/cinema/api/cinema.graphqls)

schema file and put it in `src/main/resources/io/github/ermadmi78/kobby/cinema/api/`

### Configure Kobby Gradle plugin

* Add Kobby plugin to your `build.gradle.kts`, to generate Kotlin DSL.

* Configure Kotlin data types for scalars, defined in the GraphQL schema (more details about the scalar mapping

  see [here](https://github.com/ermadmi78/kobby/wiki/Gradle-GraphQL-Scalar-Mapping)).

* Add Jackson dependency to enable Jackson serialization or

  configure [Kotlinx Serialization](https://github.com/ermadmi78/kobby/wiki/Gradle-Kotlinx-Serialization-Support).

* Add Kotlin plugin to your `build.gradle.kts` to compile generated DSL.

```kotlin

import io.github.ermadmi78.kobby.kobby

description = "Cinema API Example"

plugins {

    kotlin("jvm")

    `java-library`

    id("io.github.ermadmi78.kobby")

}

kobby {

    kotlin {

        scalars = mapOf(

            "Date" to typeOf("java.time", "LocalDate"),

            "JSON" to typeMap.parameterize(typeString, typeAny.nullable())

        )

    }

}

val jacksonVersion: String by project

dependencies {

    compileOnly("com.fasterxml.jackson.core:jackson-annotations:$jacksonVersion")

}

```

### Generate Kotlin DSL Client by your GraphQL schema

Execute `gradle build` command to generate Kotlin DSL Client. The entry point of the DSL will be placed in

the `cinema.kt` file (name of the DSL entry point file is the same as the name of GraphQL schema file):

[![alt text](https://github.com/ermadmi78/kobby/blob/main/images/cinema_api.png)](https://github.com/ermadmi78/kobby/wiki/Gradle-DSL-entry-point-configuration)

More details about the entry point configuration see

[here](https://github.com/ermadmi78/kobby/wiki/Gradle-DSL-entry-point-configuration).

### Instantiate DSL Context

The `cinema.kt` file will contain the `cinemaContextOf` builder function, which creates instance of the `CinemaContext`

interface - the entry point of the generated DSL. Note that the prefixes of the builder function, adapter and context

interfaces are the same as the name of the GraphQL schema file.

```kotlin

fun cinemaContextOf(adapter: CinemaAdapter): CinemaContext = CinemaContextImpl(adapter)

```

More details about the DSL context see

[here](https://github.com/ermadmi78/kobby/wiki/Overview-of-generated-GraphQL-DSL)

We have to pass instance of the `CinemaAdapter` interface to the `cinemaContextOf` function to create instance of

the `CinemaContext` interface. By default, Kobby does not generate any adapter implementations. But we can ask Kobby to

generate default [Ktor](https://ktor.io/) implementations of the `CinemaAdapter` interface.

To do this just add `io.ktor:ktor-client-cio` dependency to you project:

```kotlin

val jacksonVersion: String by project

val ktorVersion: String by project

dependencies {

    // Add this dependency to enable Jackson annotation generation in DTO classes by Kobby

    compileOnly("com.fasterxml.jackson.core:jackson-annotations:$jacksonVersion")

    // Add this dependency to enable default Ktor adapters generation

    compileOnly("io.ktor:ktor-client-cio:$ktorVersion")

}

```

Rebuild the project, and Kobby will generate classes `CinemaSimpleKtorAdapter` and `CinemaCompositeKtorAdapter`

in subpackage `adapter.ktor`. The prefix `` by default is the schema name.

How to set up adapters for `Kotlinx Serialization` you can

see [here](https://github.com/ermadmi78/kobby/wiki/Gradle-Kotlinx-Serialization-Support).

The `CinemaSimpleKtorAdapter` is simple to configure, but it does not support GraphQL subscriptions - so we can use only

queries and mutations:

```kotlin

val client = HttpClient(CIO) {

    install(ContentNegotiation) {

        jackson {

            registerModule(ParameterNamesModule(JsonCreator.Mode.PROPERTIES))

            registerModule(JavaTimeModule())

            // Force Jackson to serialize dates as String

            disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)

        }

    }

}

val context = cinemaContextOf(CinemaSimpleKtorAdapter(client, "http://localhost:8080/graphql"))

```

The `CinemaCompositeKtorAdapter` is more difficult to configure, but it supports all types of GraphQL operations,

including subscriptions:

```kotlin

val client = HttpClient(CIO) {

    install(WebSockets)

}

val mapper = jacksonObjectMapper()

    .registerModule(ParameterNamesModule(JsonCreator.Mode.PROPERTIES))

    .registerModule(JavaTimeModule())

    // Force Jackson to serialize dates as String

    .disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)

val context = cinemaContextOf(

    CinemaCompositeKtorAdapter(

        client,

        "http://localhost:8080/graphql",

        "ws://localhost:8080/graphql",

        object : CinemaMapper {

            override fun serialize(value: Any): String =

                mapper.writeValueAsString(value)

            override fun  deserialize(content: String, contentType: KClass): T =

                mapper.readValue(content, contentType.java)

        }

    )

)

```

See [here](https://github.com/ermadmi78/kobby-gradle-example/blob/main/cinema-kotlin-client/src/main/kotlin/io/github/ermadmi78/kobby/cinema/kotlin/client/application.kt)

full example of adapters configuration. Note that you are not required to use the default adapters. You can write your

own adapter implementation.

### Ok, we are ready to execute GraphQL queries by means of generated Kotlin DSL Client

#### Simple query

[![alt text](https://github.com/ermadmi78/kobby/blob/main/images/simple_query.png)](https://github.com/ermadmi78/kobby/wiki/Overview-of-generated-GraphQL-DSL)

You can see more details about GraphQL queries support

[here](https://github.com/ermadmi78/kobby/wiki/Overview-of-generated-GraphQL-DSL)

#### Simple mutation

[![alt text](https://github.com/ermadmi78/kobby/blob/main/images/mutation.png)](https://github.com/ermadmi78/kobby/wiki/Overview-of-generated-GraphQL-DSL)

#### Simple subscription

[![alt text](https://github.com/ermadmi78/kobby/blob/main/images/subscription.png)](https://github.com/ermadmi78/kobby/wiki/Support-for-GraphQL-subscriptions)

You can see more details about GraphQL subscriptions support

[here](https://github.com/ermadmi78/kobby/wiki/Support-for-GraphQL-subscriptions)

#### We can download a complex graph of objects by means of our Kotlin DSL

[![alt text](https://github.com/ermadmi78/kobby/blob/main/images/complex_query.png)](https://github.com/ermadmi78/kobby/wiki/Overview-of-generated-GraphQL-DSL)

#### GraphQL's unions and interfaces are supported too

[![alt text](https://github.com/ermadmi78/kobby/blob/main/images/union_query.png)](https://github.com/ermadmi78/kobby/wiki/Support-for-GraphQL-Abstract-Data-Types)

You can see more details about GraphQL abstract data types support

[here](https://github.com/ermadmi78/kobby/wiki/Support-for-GraphQL-Abstract-Data-Types)

### License

[Apache License Version 2.0](https://github.com/ermadmi78/kobby/blob/main/LICENSE)