spring-graphql HttpGraphQlTransport 源码
spring-graphql HttpGraphQlTransport 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/client/HttpGraphQlTransport.java
/*
* Copyright 2002-2022 the original author or authors.
*
* 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 org.springframework.graphql.client;
import java.util.Map;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.graphql.GraphQlRequest;
import org.springframework.graphql.GraphQlResponse;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.util.Assert;
import org.springframework.web.reactive.function.client.WebClient;
/**
* Transport to execute GraphQL requests over HTTP via {@link WebClient}.
*
* <p>Supports only single-response requests over HTTP POST. For subscriptions,
* see {@link WebSocketGraphQlTransport} and {@link RSocketGraphQlTransport}.
*
* @author Rossen Stoyanchev
* @since 1.0.0
*/
final class HttpGraphQlTransport implements GraphQlTransport {
private static final ParameterizedTypeReference<Map<String, Object>> MAP_TYPE =
new ParameterizedTypeReference<Map<String, Object>>() {};
private final WebClient webClient;
private final MediaType contentType;
HttpGraphQlTransport(WebClient webClient) {
Assert.notNull(webClient, "WebClient is required");
this.webClient = webClient;
this.contentType = initContentType(webClient);
}
private static MediaType initContentType(WebClient webClient) {
HttpHeaders headers = new HttpHeaders();
webClient.mutate().defaultHeaders(headers::putAll);
MediaType contentType = headers.getContentType();
return (contentType != null ? contentType : MediaType.APPLICATION_JSON);
}
@Override
public Mono<GraphQlResponse> execute(GraphQlRequest request) {
return this.webClient.post()
.contentType(this.contentType)
.accept(MediaType.APPLICATION_JSON, MediaType.APPLICATION_GRAPHQL)
.bodyValue(request.toMap())
.retrieve()
.bodyToMono(MAP_TYPE)
.map(ResponseMapGraphQlResponse::new);
}
@Override
public Flux<GraphQlResponse> executeSubscription(GraphQlRequest request) {
throw new UnsupportedOperationException("Subscriptions not supported over HTTP");
}
}
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