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HeaderServerInterceptor.java
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HeaderServerInterceptor.java
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/*
* Copyright 2015 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.examples.header;
import com.google.common.annotations.VisibleForTesting;
import io.grpc.ForwardingServerCall.SimpleForwardingServerCall;
import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;
import java.util.logging.Logger;
/**
* A interceptor to handle server header.
*/
public class HeaderServerInterceptor implements ServerInterceptor {
private static final Logger logger = Logger.getLogger(HeaderServerInterceptor.class.getName());
@VisibleForTesting
static final Metadata.Key<String> CUSTOM_HEADER_KEY =
Metadata.Key.of("custom_server_header_key", Metadata.ASCII_STRING_MARSHALLER);
@Override
public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
ServerCall<ReqT, RespT> call,
final Metadata requestHeaders,
ServerCallHandler<ReqT, RespT> next) {
logger.info("header received from client:" + requestHeaders);
return next.startCall(new SimpleForwardingServerCall<ReqT, RespT>(call) {
@Override
public void sendHeaders(Metadata responseHeaders) {
responseHeaders.put(CUSTOM_HEADER_KEY, "customRespondValue");
super.sendHeaders(responseHeaders);
}
}, requestHeaders);
}
}