com.expediagroup.graphql.plugin.gradle.tasks.GraphQLIntrospectSchemaTask.kt Maven / Gradle / Ivy

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Gradle Kotlin Gradle Plugin that can generate type-safe GraphQL Kotlin client and GraphQL schema in SDL format using reflections
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/*
 * Copyright 2021 Expedia, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.expediagroup.graphql.plugin.gradle.tasks

import com.expediagroup.graphql.plugin.gradle.actions.IntrospectSchemaAction
import com.expediagroup.graphql.plugin.gradle.config.TimeoutConfiguration
import org.gradle.api.DefaultTask
import org.gradle.api.file.ConfigurableFileCollection
import org.gradle.api.file.RegularFileProperty
import org.gradle.api.provider.MapProperty
import org.gradle.api.provider.Property
import org.gradle.api.tasks.Classpath
import org.gradle.api.tasks.Input
import org.gradle.api.tasks.OutputFile
import org.gradle.api.tasks.TaskAction
import org.gradle.api.tasks.options.Option
import org.gradle.workers.ClassLoaderWorkerSpec
import org.gradle.workers.WorkQueue
import org.gradle.workers.WorkerExecutor
import javax.inject.Inject

internal const val INTROSPECT_SCHEMA_TASK_NAME: String = "graphqlIntrospectSchema"

/**
 * Task that executes GraphQL introspection query against specified endpoint and saves the underlying schema file.
 */
@Suppress("UnstableApiUsage")
abstract class GraphQLIntrospectSchemaTask : DefaultTask() {

    @get:Classpath
    val pluginClasspath: ConfigurableFileCollection = project.objects.fileCollection()

    /**
     * Target GraphQL server endpoint that will be used to execute introspection queries.
     */
    @Input
    @Option(option = "endpoint", description = "target GraphQL endpoint")
    val endpoint: Property = project.objects.property(String::class.java)

    /**
     * Optional HTTP headers to be specified on an introspection query.
     */
    @Input
    val headers: MapProperty = project.objects.mapProperty(String::class.java, Any::class.java)

    /**
     * Timeout configuration that specifies maximum amount of time (in milliseconds) to connect and execute introspection query before we cancel the request.
     * Defaults to Ktor CIO engine defaults (5 seconds for connect timeout and 15 seconds for read timeout).
     */
    @Input
    val timeoutConfig: Property = project.objects.property(TimeoutConfiguration::class.java)

    /**
     * Target GraphQL schema file to be generated.
     */
    @OutputFile
    val outputFile: RegularFileProperty = project.objects.fileProperty()

    @Inject
    abstract fun getWorkerExecutor(): WorkerExecutor

    init {
        group = "GraphQL"
        description = "Run introspection query against target GraphQL endpoint and save schema locally."

        headers.convention(emptyMap())
        timeoutConfig.convention(TimeoutConfiguration())
        outputFile.convention(project.layout.buildDirectory.file("schema.graphql"))
    }

    /**
     * Executes introspection query against specified endpoint and saves the resulting schema locally in the target output file.
     */
    @Suppress("EXPERIMENTAL_API_USAGE")
    @TaskAction
    fun introspectSchemaAction() {
        val schemaFile = outputFile.asFile.get()
        val targetDirectory = schemaFile.parentFile
        if (!targetDirectory.isDirectory && !targetDirectory.mkdirs()) {
            throw RuntimeException("failed to generate target schema directory = $targetDirectory")
        }

        val workQueue: WorkQueue = getWorkerExecutor().classLoaderIsolation { workerSpec: ClassLoaderWorkerSpec ->
            workerSpec.classpath.from(pluginClasspath)
            logger.debug("worker classpath: \n${workerSpec.classpath.files.joinToString("\n")}")
        }

        logger.debug("submitting work item to introspect schema from ${endpoint.get()} endpoint")
        workQueue.submit(IntrospectSchemaAction::class.java) { parameters ->
            parameters.endpoint.set(endpoint)
            parameters.headers.set(headers)
            parameters.timeoutConfiguration.set(timeoutConfig)
            parameters.schemaFile.set(schemaFile)
        }
        workQueue.await()
        logger.debug("successfully introspected GraphQL schema")
    }
}