Fix UnsupportedOperationException happening when reactor-rabbitmq is used (#3381)

instrumentation/rabbitmq-2.7/javaagent/rabbitmq-2.7-javaagent.gradle

@@ -15,6 +15,10 @@ dependencies {
   testLibrary ("org.springframework.amqp:spring-rabbit:1.1.0.RELEASE") {
     exclude group: 'com.rabbitmq', module: 'amqp-client'
   }
+
+  testInstrumentation project(':instrumentation:reactor-3.1:javaagent')
+
+  testLibrary 'io.projectreactor.rabbitmq:reactor-rabbitmq:1.0.0.RELEASE'
 }
 
 tasks.withType(Test).configureEach {

instrumentation/rabbitmq-2.7/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/rabbitmq/RabbitChannelInstrumentation.java

@@ -50,7 +50,9 @@ public class RabbitChannelInstrumentation implements TypeInstrumentation {
 
   @Override
   public ElementMatcher<TypeDescription> typeMatcher() {
-    return implementsInterface(named("com.rabbitmq.client.Channel"));
+    return implementsInterface(named("com.rabbitmq.client.Channel"))
+        // broken implementation that throws UnsupportedOperationException on getConnection() calls
+        .and(not(named("reactor.rabbitmq.ChannelProxy")));
   }
 
   @Override

instrumentation/rabbitmq-2.7/javaagent/src/test/groovy/RabbitMqTest.groovy

@@ -12,7 +12,6 @@ import static io.opentelemetry.instrumentation.test.utils.TraceUtils.runUnderTra
 import com.rabbitmq.client.AMQP
 import com.rabbitmq.client.Channel
 import com.rabbitmq.client.Connection
-import com.rabbitmq.client.ConnectionFactory
 import com.rabbitmq.client.Consumer
 import com.rabbitmq.client.DefaultConsumer
 import com.rabbitmq.client.Envelope
@@ -23,42 +22,24 @@ import io.opentelemetry.instrumentation.test.AgentInstrumentationSpecification
 import io.opentelemetry.instrumentation.test.asserts.TraceAssert
 import io.opentelemetry.sdk.trace.data.SpanData
 import io.opentelemetry.semconv.trace.attributes.SemanticAttributes
-import java.time.Duration
 import org.springframework.amqp.core.AmqpAdmin
 import org.springframework.amqp.core.AmqpTemplate
 import org.springframework.amqp.core.Queue
 import org.springframework.amqp.rabbit.connection.CachingConnectionFactory
 import org.springframework.amqp.rabbit.core.RabbitAdmin
 import org.springframework.amqp.rabbit.core.RabbitTemplate
-import org.testcontainers.containers.GenericContainer
-import spock.lang.Shared
 
-class RabbitMQTest extends AgentInstrumentationSpecification {
+class RabbitMqTest extends AgentInstrumentationSpecification implements WithRabbitMqTrait {
 
-  @Shared
-  def rabbitMQContainer
-  @Shared
-  InetSocketAddress rabbitmqAddress
-
-  ConnectionFactory factory = new ConnectionFactory(host: rabbitmqAddress.hostName, port: rabbitmqAddress.port)
-  Connection conn = factory.newConnection()
+  Connection conn = connectionFactory.newConnection()
   Channel channel = conn.createChannel()
 
   def setupSpec() {
-    rabbitMQContainer = new GenericContainer('rabbitmq:latest')
-      .withExposedPorts(5672)
-      .withStartupTimeout(Duration.ofSeconds(120))
-    rabbitMQContainer.start()
-    rabbitmqAddress = new InetSocketAddress(
-      rabbitMQContainer.containerIpAddress,
-      rabbitMQContainer.getMappedPort(5672)
-    )
+    startRabbit()
   }
 
   def cleanupSpec() {
-    if (rabbitMQContainer) {
-      rabbitMQContainer.stop()
-    }
+    stopRabbit()
   }
 
   def cleanup() {
@@ -266,7 +247,7 @@ class RabbitMQTest extends AgentInstrumentationSpecification {
 
   def "test spring rabbit"() {
     setup:
-    def connectionFactory = new CachingConnectionFactory(rabbitmqAddress.hostName, rabbitmqAddress.port)
+    def connectionFactory = new CachingConnectionFactory(connectionFactory)
     AmqpAdmin admin = new RabbitAdmin(connectionFactory)
     def queue = new Queue("some-routing-queue", false, true, true, null)
     admin.declareQueue(queue)

instrumentation/rabbitmq-2.7/javaagent/src/test/groovy/ReactorRabbitMqTest.groovy

@@ -0,0 +1,54 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import io.opentelemetry.api.trace.SpanKind
+import io.opentelemetry.instrumentation.test.AgentInstrumentationSpecification
+import io.opentelemetry.semconv.trace.attributes.SemanticAttributes
+import reactor.rabbitmq.ExchangeSpecification
+import reactor.rabbitmq.RabbitFlux
+import reactor.rabbitmq.SenderOptions
+
+class ReactorRabbitMqTest extends AgentInstrumentationSpecification implements WithRabbitMqTrait {
+
+  def setupSpec() {
+    startRabbit()
+  }
+
+  def cleanupSpec() {
+    stopRabbit()
+  }
+
+  def "should not fail declaring exchange"() {
+    given:
+    def sender = RabbitFlux.createSender(new SenderOptions().connectionFactory(connectionFactory))
+
+    when:
+    sender.declareExchange(ExchangeSpecification.exchange("testExchange"))
+      .block()
+
+    then:
+    noExceptionThrown()
+
+    assertTraces(1) {
+      trace(0, 1) {
+        span(0) {
+          name 'exchange.declare'
+          kind SpanKind.CLIENT
+          attributes {
+            "${SemanticAttributes.NET_PEER_NAME.key}" { it == null || it instanceof String }
+            "${SemanticAttributes.NET_PEER_IP.key}" String
+            "${SemanticAttributes.NET_PEER_PORT.key}" { it == null || it instanceof Long }
+            "${SemanticAttributes.MESSAGING_SYSTEM.key}" "rabbitmq"
+            "${SemanticAttributes.MESSAGING_DESTINATION_KIND.key}" "queue"
+            "rabbitmq.command" "exchange.declare"
+          }
+        }
+      }
+    }
+
+    cleanup:
+    sender?.close()
+  }
+}

instrumentation/rabbitmq-2.7/javaagent/src/test/groovy/WithRabbitMqTrait.groovy

@@ -0,0 +1,30 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import com.rabbitmq.client.ConnectionFactory
+import java.time.Duration
+import org.testcontainers.containers.GenericContainer
+
+trait WithRabbitMqTrait {
+
+  static GenericContainer rabbitMqContainer
+  static ConnectionFactory connectionFactory
+
+  def startRabbit() {
+    rabbitMqContainer = new GenericContainer('rabbitmq:latest')
+      .withExposedPorts(5672)
+      .withStartupTimeout(Duration.ofSeconds(120))
+    rabbitMqContainer.start()
+
+    connectionFactory = new ConnectionFactory(
+      host: rabbitMqContainer.containerIpAddress,
+      port: rabbitMqContainer.getMappedPort(5672)
+    )
+  }
+
+  def stopRabbit() {
+    rabbitMqContainer?.stop()
+  }
+}