io.dapr.internal.grpc.interceptors.DaprAppIdInterceptor Maven / Gradle / Ivy
/*
* Copyright 2024 The Dapr 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.dapr.internal.grpc.interceptors;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
/**
* Class to be used as part of your service's client stub interceptor to include Dapr App Id metadata.
*/
public class DaprAppIdInterceptor implements ClientInterceptor {
private final Metadata extraHeaders;
public DaprAppIdInterceptor(String appId) {
this.extraHeaders = buildMetadata(appId);
}
private static final Metadata buildMetadata(String appId) {
if (appId == null) {
return null;
}
Metadata headers = new Metadata();
headers.put(Metadata.Key.of("dapr-app-id", Metadata.ASCII_STRING_MARSHALLER), appId);
return headers;
}
@Override
public ClientCall interceptCall(
MethodDescriptor methodDescriptor,
CallOptions options,
Channel channel) {
ClientCall clientCall = channel.newCall(methodDescriptor, options);
final Metadata extraHeaders = this.extraHeaders;
return new ForwardingClientCall.SimpleForwardingClientCall<>(clientCall) {
@Override
public void start(ClientCall.Listener responseListener, Metadata headers) {
if (extraHeaders != null) {
headers.merge(extraHeaders);
}
super.start(responseListener, headers);
}
};
}
}