main.com.netflix.graphql.dgs.internal.DgsDataLoaderInstrumentationDataLoaderCustomizer.kt Maven / Gradle / Ivy

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/*
 * Copyright 2024 Netflix, 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
 *
 *    http://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.netflix.graphql.dgs.internal

import com.netflix.graphql.dgs.DgsDataLoaderCustomizer
import com.netflix.graphql.dgs.DgsDataLoaderInstrumentation
import com.netflix.graphql.dgs.DgsDataLoaderRegistryConsumer
import com.netflix.graphql.dgs.exceptions.DgsDataLoaderInstrumentationException
import org.dataloader.BatchLoader
import org.dataloader.BatchLoaderEnvironment
import org.dataloader.BatchLoaderWithContext
import org.dataloader.DataLoaderRegistry
import org.dataloader.MappedBatchLoader
import org.dataloader.MappedBatchLoaderWithContext
import java.util.concurrent.CompletionStage

class DgsDataLoaderInstrumentationDataLoaderCustomizer(
    private val instrumentations: List,
) : DgsDataLoaderCustomizer {
    override fun provide(
        original: BatchLoader<*, *>,
        name: String,
    ): Any = throw DgsDataLoaderInstrumentationException(name)

    override fun provide(
        original: BatchLoaderWithContext<*, *>,
        name: String,
    ): Any = BatchLoaderWithContextInstrumentationDriver(original, name, instrumentations)

    override fun provide(
        original: MappedBatchLoader<*, *>,
        name: String,
    ): Any = throw DgsDataLoaderInstrumentationException(name)

    override fun provide(
        original: MappedBatchLoaderWithContext<*, *>,
        name: String,
    ): Any = MappedBatchLoaderWithContextInstrumentationDriver(original, name, instrumentations)
}

internal class BatchLoaderWithContextInstrumentationDriver(
    private val original: BatchLoaderWithContext,
    private val name: String,
    private val instrumentations: List,
) : BatchLoaderWithContext,
    DgsDataLoaderRegistryConsumer {
    override fun load(
        keys: List,
        environment: BatchLoaderEnvironment,
    ): CompletionStage> {
        val contexts = instrumentations.map { it.onDispatch(name, keys, environment) }
        val future = original.load(keys, environment)

        return future.whenComplete { result, exception ->
            try {
                contexts.asReversed().forEach { c ->
                    c.onComplete(result, exception)
                }
            } catch (_: Throwable) {
            }
        }
    }

    override fun setDataLoaderRegistry(dataLoaderRegistry: DataLoaderRegistry?) {
        if (original is DgsDataLoaderRegistryConsumer) {
            (original as DgsDataLoaderRegistryConsumer).setDataLoaderRegistry(dataLoaderRegistry)
        }
    }
}

internal class MappedBatchLoaderWithContextInstrumentationDriver(
    private val original: MappedBatchLoaderWithContext,
    private val name: String,
    private val instrumentations: List,
) : MappedBatchLoaderWithContext,
    DgsDataLoaderRegistryConsumer {
    override fun load(
        keys: Set,
        environment: BatchLoaderEnvironment,
    ): CompletionStage> {
        val keysList = keys.toList()
        val contexts = instrumentations.map { it.onDispatch(name, keysList, environment) }

        val future = original.load(keys, environment)

        return future.whenComplete { result, exception ->
            try {
                contexts.asReversed().forEach { c ->
                    c.onComplete(result, exception)
                }
            } catch (_: Throwable) {
            }
        }
    }

    override fun setDataLoaderRegistry(dataLoaderRegistry: DataLoaderRegistry?) {
        if (original is DgsDataLoaderRegistryConsumer) {
            (original as DgsDataLoaderRegistryConsumer).setDataLoaderRegistry(dataLoaderRegistry)
        }
    }
}