spring-graphql CompositeSubscriptionExceptionResolver 源码
spring-graphql CompositeSubscriptionExceptionResolver 代码
文件路径：/spring-graphql/src/main/java/org/springframework/graphql/execution/CompositeSubscriptionExceptionResolver.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.execution;
import java.util.Collections;
import java.util.List;
import graphql.GraphQLError;
import graphql.GraphqlErrorBuilder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.util.Assert;
/**
* Implementation of {@link SubscriptionExceptionResolver} that is given a list
* of other {@link SubscriptionExceptionResolver}'s to invoke in turn until one
* returns a list of {@link GraphQLError}'s.
*
* <p>If the exception remains unresolved, it is mapped to a default error of
* type {@link ErrorType#INTERNAL_ERROR} with a generic message.
*
* @author Mykyta Ivchenko
* @author Rossen Stoyanchev
* @since 1.0.1
*/
class CompositeSubscriptionExceptionResolver implements SubscriptionExceptionResolver {
private static final Log logger = LogFactory.getLog(CompositeSubscriptionExceptionResolver.class);
private final List<SubscriptionExceptionResolver> resolvers;
CompositeSubscriptionExceptionResolver(List<SubscriptionExceptionResolver> resolvers) {
Assert.notNull(resolvers, "'resolvers' is required");
this.resolvers = resolvers;
}
@Override
public Mono<List<GraphQLError>> resolveException(Throwable exception) {
return Flux.fromIterable(this.resolvers)
.flatMap(resolver -> resolver.resolveException(exception))
.next()
.onErrorResume(error -> Mono.just(handleResolverException(error, exception)))
.defaultIfEmpty(createDefaultError());
}
private List<GraphQLError> handleResolverException(
Throwable resolverException, Throwable originalException) {
if (logger.isWarnEnabled()) {
logger.warn("Failure while resolving " + originalException.getClass().getName(), resolverException);
}
return createDefaultError();
}
private List<GraphQLError> createDefaultError() {
return Collections.singletonList(GraphqlErrorBuilder.newError()
.message("Subscription error")
.errorType(ErrorType.INTERNAL_ERROR)
.build());
}
}
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