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fix(3.2): The oneToOne method of the ReactorServerCalls class will cause the request to hang when the result is Mono Empty #14121

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merged 3 commits into from May 8, 2024
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fix(3.2): The oneToOne method of the ReactorServerCalls class will cause the request to hang when the result is Mono Empty #14121

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2370010
Fix triple reactor request hung when result is Mono Empty
Apr 22, 2024
223e108
code format
Apr 22, 2024
ea930f1
fix compile
caoyanan666 Apr 22, 2024
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31 changes: 20 additions & 11 deletions ...ugin/dubbo-reactive/src/main/java/org/apache/dubbo/reactive/calls/ReactorServerCalls.java
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Expand Up @@ -19,10 +19,11 @@
import org.apache.dubbo.common.stream.StreamObserver;
import org.apache.dubbo.reactive.ServerTripleReactorPublisher;
import org.apache.dubbo.reactive.ServerTripleReactorSubscriber;
import org.apache.dubbo.rpc.StatusRpcException;
import org.apache.dubbo.rpc.TriRpcStatus;
import org.apache.dubbo.rpc.protocol.tri.observer.CallStreamObserver;
import org.apache.dubbo.rpc.protocol.tri.observer.ServerCallToObserverAdapter;

import java.util.concurrent.CompletableFuture;
import java.util.function.Function;

import reactor.core.publisher.Flux;
Expand All @@ -43,16 +44,18 @@ private ReactorServerCalls() {}
* @param func service implementation
*/
public static <T, R> void oneToOne(T request, StreamObserver<R> responseObserver, Function<Mono<T>, Mono<R>> func) {
func.apply(Mono.just(request)).subscribe(res -> {
CompletableFuture.completedFuture(res).whenComplete((r, t) -> {
if (t != null) {
responseObserver.onError(t);
} else {
responseObserver.onNext(r);
responseObserver.onCompleted();
}
});
});
try {
func.apply(Mono.just(request))
.subscribe(
res -> {
responseObserver.onNext(res);
responseObserver.onCompleted();
},
throwable -> doOnResponseHasException(throwable, responseObserver),
() -> doOnResponseHasException(TriRpcStatus.NOT_FOUND.asException(), responseObserver));
} catch (Throwable throwable) {
doOnResponseHasException(throwable, responseObserver);
}
}

/**
Expand Down Expand Up @@ -131,4 +134,10 @@ public static <T, R> StreamObserver<T> manyToMany(

return serverPublisher;
}

private static void doOnResponseHasException(Throwable throwable, StreamObserver<?> responseObserver) {
StatusRpcException statusRpcException =
TriRpcStatus.getStatus(throwable).asException();
responseObserver.onError(statusRpcException);
}
}