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SpringGraphQLSubscriptionHandler.kt
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SpringGraphQLSubscriptionHandler.kt
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/*
* Copyright 2019 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.server.spring.subscriptions
import com.expediagroup.graphql.generator.execution.GraphQLContext
import com.expediagroup.graphql.server.exception.KotlinGraphQLError
import com.expediagroup.graphql.server.extensions.toExecutionInput
import com.expediagroup.graphql.server.extensions.toGraphQLKotlinType
import com.expediagroup.graphql.server.extensions.toGraphQLResponse
import com.expediagroup.graphql.types.GraphQLRequest
import com.expediagroup.graphql.types.GraphQLResponse
import graphql.ExecutionResult
import graphql.GraphQL
import org.reactivestreams.Publisher
import reactor.core.publisher.Flux
import reactor.kotlin.core.publisher.toFlux
/**
* Default Spring implementation of GraphQL subscription handler.
*/
open class SpringGraphQLSubscriptionHandler(private val graphQL: GraphQL) {
fun executeSubscription(graphQLRequest: GraphQLRequest, graphQLContext: GraphQLContext?): Flux<GraphQLResponse<*>> = Flux.deferContextual {
graphQL.execute(graphQLRequest.toExecutionInput(graphQLContext))
.getData<Publisher<ExecutionResult>>()
.toFlux()
.map { result -> result.toGraphQLResponse() }
.onErrorResume { throwable ->
val error = KotlinGraphQLError(throwable).toGraphQLKotlinType()
Flux.just(GraphQLResponse<Any>(errors = listOf(error)))
}
}
}