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LoggingServerProvider.java
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LoggingServerProvider.java
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/*
* Copyright 2022 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.gcp.observability;
import static com.google.common.base.Preconditions.checkNotNull;
import io.grpc.InternalServerProvider;
import io.grpc.ServerBuilder;
import io.grpc.ServerCredentials;
import io.grpc.ServerProvider;
import io.grpc.ServerRegistry;
import io.grpc.gcp.observability.interceptors.InternalLoggingServerInterceptor;
/** A server provider that injects the logging interceptor. */
final class LoggingServerProvider extends ServerProvider {
private final ServerProvider prevProvider;
private final InternalLoggingServerInterceptor.Factory serverInterceptorFactory;
private static LoggingServerProvider instance;
private LoggingServerProvider(InternalLoggingServerInterceptor.Factory factory) {
prevProvider = ServerProvider.provider();
serverInterceptorFactory = factory;
}
static synchronized void init(InternalLoggingServerInterceptor.Factory factory) {
if (instance != null) {
throw new IllegalStateException("LoggingServerProvider already initialized!");
}
instance = new LoggingServerProvider(factory);
ServerRegistry.getDefaultRegistry().register(instance);
}
static synchronized void shutdown() {
if (instance == null) {
throw new IllegalStateException("LoggingServerProvider not initialized!");
}
ServerRegistry.getDefaultRegistry().deregister(instance);
instance = null;
}
@Override
protected boolean isAvailable() {
return true;
}
@Override
protected int priority() {
return 6;
}
private ServerBuilder<?> addInterceptor(ServerBuilder<?> builder) {
return builder.intercept(serverInterceptorFactory.create());
}
@Override
protected ServerBuilder<?> builderForPort(int port) {
return addInterceptor(InternalServerProvider.builderForPort(prevProvider, port));
}
@Override
protected NewServerBuilderResult newServerBuilderForPort(int port, ServerCredentials creds) {
ServerProvider.NewServerBuilderResult result = InternalServerProvider.newServerBuilderForPort(
prevProvider, port,
creds);
ServerBuilder<?> builder = result.getServerBuilder();
if (builder != null) {
return ServerProvider.NewServerBuilderResult.serverBuilder(
addInterceptor(builder));
}
checkNotNull(result.getError(), "Expected error to be set!");
return result;
}
}