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ContextPropagationTest.java
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ContextPropagationTest.java
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/*
* Copyright (c) 2022 VMware, Inc. or its affiliates, All Rights Reserved.
*
* 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
*
* https://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 reactor.netty;
import io.micrometer.context.ContextRegistry;
import io.micrometer.context.ContextSnapshot;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import reactor.core.publisher.Mono;
import reactor.netty.channel.ChannelOperations;
import reactor.netty.resources.ConnectionProvider;
import reactor.netty.tcp.TcpClient;
import reactor.netty.tcp.TcpServer;
import reactor.test.StepVerifier;
import java.nio.charset.Charset;
import java.time.Duration;
import java.util.HashMap;
import static org.assertj.core.api.Assertions.assertThat;
import static reactor.netty.ReactorNetty.getChannelContext;
class ContextPropagationTest {
static final ConnectionProvider provider = ConnectionProvider.create("testContextPropagation", 1);
@AfterAll
static void disposePool() {
provider.disposeLater()
.block(Duration.ofSeconds(30));
}
@ParameterizedTest
@MethodSource("tcpClientCombinations")
@SuppressWarnings("unchecked")
void testContextPropagation(TcpClient client) {
DisposableServer disposableServer =
TcpServer.create()
.wiretap(true)
.handle((in, out) -> out.send(in.receive().retain()))
.bindNow();
ContextRegistry registry = ContextRegistry.getInstance();
Connection connection = null;
try {
registry.registerThreadLocalAccessor(new TestThreadLocalAccessor());
TestThreadLocalHolder.value("First");
connection =
client.port(disposableServer.port())
.wiretap(true)
.connect()
.contextWrite(ctx -> ctx.putAllMap((HashMap<Object, Object>) ContextSnapshot.captureAll(registry)))
.block();
assertThat(connection).isNotNull();
connection.outbound()
.withConnection(conn -> conn.addHandlerLast(TestChannelOutboundHandler.INSTANCE))
.sendString(Mono.just("Test"))
.then()
.subscribe();
connection.inbound()
.receive()
.asString()
.take(1)
.as(StepVerifier::create)
.expectNext("TestFirstSecond")
.expectComplete()
.verify(Duration.ofSeconds(5));
}
finally {
if (connection != null) {
connection.disposeNow();
}
TestThreadLocalHolder.reset();
registry.removeThreadLocalAccessor(TestThreadLocalAccessor.KEY);
disposableServer.disposeNow();
}
}
static Object[] tcpClientCombinations() {
return new Object[] {
TcpClient.create(),
TcpClient.newConnection(),
TcpClient.create(provider)
};
}
static final class TestChannelOutboundHandler extends ChannelOutboundHandlerAdapter {
static final ChannelHandler INSTANCE = new TestChannelOutboundHandler();
@Override
public boolean isSharable() {
return true;
}
@Override
@SuppressWarnings("FutureReturnValueIgnored")
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
try {
ChannelOperations<?, ?> ops = ChannelOperations.get(ctx.channel());
if (ops != null && ops.currentContext() == getChannelContext(ctx.channel())) {
TestThreadLocalHolder.value("Second");
}
else {
TestThreadLocalHolder.value("Error");
}
if (msg instanceof ByteBuf) {
ByteBuf buffer1;
try (ContextSnapshot.Scope scope = ContextSnapshot.captureFrom(ctx.channel()).setThreadLocals()) {
buffer1 = Unpooled.wrappedBuffer(TestThreadLocalHolder.value().getBytes(Charset.defaultCharset()));
}
ByteBuf buffer2 = Unpooled.wrappedBuffer(TestThreadLocalHolder.value().getBytes(Charset.defaultCharset()));
//"FutureReturnValueIgnored" this is deliberate
ctx.write(ctx.alloc().compositeBuffer()
.addComponents(true, (ByteBuf) msg, buffer1, buffer2), promise);
}
else {
//"FutureReturnValueIgnored" this is deliberate
ctx.write(msg, promise);
}
}
finally {
TestThreadLocalHolder.reset();
}
}
}
}