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graphql-dgs-reactive

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/*
 * Copyright 2021 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.reactive.internal

import com.netflix.graphql.dgs.context.DgsContext
import com.netflix.graphql.dgs.context.ReactiveDgsContext
import com.netflix.graphql.dgs.internal.DgsRequestData
import com.netflix.graphql.dgs.reactive.DgsReactiveCustomContextBuilderWithRequest
import org.springframework.http.HttpHeaders
import org.springframework.http.server.reactive.ServerHttpRequest
import org.springframework.web.reactive.function.server.ServerRequest
import reactor.core.publisher.Mono
import java.util.*

open class DefaultDgsReactiveGraphQLContextBuilder(
    private val dgsReactiveCustomContextBuilderWithRequest: Optional> = Optional.empty(),
) {
    fun build(dgsRequestData: DgsReactiveRequestData?): Mono {
        val customContext =
            if (dgsReactiveCustomContextBuilderWithRequest.isPresent) {
                dgsReactiveCustomContextBuilderWithRequest.get().build(
                    dgsRequestData?.extensions ?: mapOf(),
                    HttpHeaders.readOnlyHttpHeaders(
                        dgsRequestData?.headers
                            ?: HttpHeaders(),
                    ),
                    dgsRequestData?.serverRequest,
                )
            } else {
                Mono.empty()
            }

        return Mono.deferContextual { context ->
            customContext
                .map {
                    ReactiveDgsContext(
                        it,
                        dgsRequestData,
                        context,
                    )
                }.defaultIfEmpty(
                    ReactiveDgsContext(
                        requestData = dgsRequestData,
                        reactorContext = context,
                    ),
                )
        }
    }
}

/**
 * @param extensions Optional map of extensions - useful for customized GraphQL interactions between for example a gateway and dgs.
 * @param headers Http Headers
 * @param serverRequest Spring reactive [ServerHttpRequest]. This will only be available when deployed in a WebFlux (non-Servlet) environment.
 */
data class DgsReactiveRequestData(
    override val extensions: Map? = emptyMap(),
    override val headers: HttpHeaders? = HttpHeaders.readOnlyHttpHeaders(HttpHeaders()),
    val serverRequest: ServerRequest? = null,
) : DgsRequestData