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ForceTrailersServerInterceptor.java
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ForceTrailersServerInterceptor.java
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/*
* Copyright 2023 The gRPC 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
*
* 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 io.grpc.servlet;
import io.grpc.ForwardingServerCall;
import io.grpc.ForwardingServerCallListener;
import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;
import io.grpc.Status;
class ForceTrailersServerInterceptor implements ServerInterceptor {
@Override
public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
ServerCall<ReqT, RespT> call,
Metadata headers,
ServerCallHandler<ReqT, RespT> next) {
ForceTrailersServerCall<ReqT, RespT> interceptedCall = new ForceTrailersServerCall<>(call);
try {
return new ForwardingServerCallListener.SimpleForwardingServerCallListener<ReqT>(
next.startCall(interceptedCall, headers)) {
@Override
public void onMessage(ReqT message) {
try {
super.onMessage(message);
} catch (Throwable t) {
sendHeaders();
throw t;
}
}
@Override
public void onHalfClose() {
try {
super.onHalfClose();
} catch (Throwable t) {
sendHeaders();
throw t;
}
}
@Override
public void onCancel() {
try {
super.onCancel();
} catch (Throwable t) {
sendHeaders();
throw t;
}
}
@Override
public void onComplete() {
try {
super.onComplete();
} catch (Throwable t) {
sendHeaders();
throw t;
}
}
@Override
public void onReady() {
try {
super.onReady();
} catch (Throwable t) {
sendHeaders();
throw t;
}
}
private void sendHeaders() {
interceptedCall.maybeSendEmptyHeaders();
}
};
} catch (RuntimeException e) {
interceptedCall.maybeSendEmptyHeaders();
throw e;
}
}
static class ForceTrailersServerCall<ReqT, RespT> extends
ForwardingServerCall.SimpleForwardingServerCall<ReqT, RespT> {
private volatile boolean headersSent = false;
ForceTrailersServerCall(ServerCall<ReqT, RespT> delegate) {
super(delegate);
}
void maybeSendEmptyHeaders() {
if (!headersSent) {
this.sendHeaders(new Metadata());
}
}
@Override
public void sendHeaders(Metadata headers) {
super.sendHeaders(headers);
headersSent = true;
}
@Override
public void close(Status status, Metadata trailers) {
if (!headersSent) {
sendHeaders(new Metadata());
}
super.close(status, trailers);
}
}
}