interop-test: add opentelemetry tracing context propagation test

interop-testing/build.gradle

@@ -13,6 +13,7 @@ dependencies {
     implementation project(path: ':grpc-alts', configuration: 'shadow'),
             project(':grpc-auth'),
             project(':grpc-census'),
+            project(':grpc-opentelemetry'),
             project(':grpc-gcp-csm-observability'),
             project(':grpc-netty'),
             project(':grpc-okhttp'),

interop-testing/src/test/java/io/grpc/testing/integration/OpenTelemetryContextPropagationTest.java

@@ -0,0 +1,191 @@
+/*
+ * Copyright 2024 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.testing.integration;
+
+import static org.junit.Assert.assertEquals;
+
+import io.grpc.ForwardingServerCallListener;
+import io.grpc.InsecureServerCredentials;
+import io.grpc.ManagedChannelBuilder;
+import io.grpc.Metadata;
+import io.grpc.ServerBuilder;
+import io.grpc.ServerCall;
+import io.grpc.ServerCallHandler;
+import io.grpc.ServerInterceptor;
+import io.grpc.netty.InternalNettyChannelBuilder;
+import io.grpc.netty.NettyChannelBuilder;
+import io.grpc.netty.NettyServerBuilder;
+import io.grpc.opentelemetry.GrpcOpenTelemetry;
+import io.grpc.opentelemetry.GrpcTraceBinContextPropagator;
+import io.grpc.opentelemetry.InternalGrpcOpenTelemetry;
+import io.grpc.testing.integration.Messages.SimpleRequest;
+import io.opentelemetry.api.trace.Span;
+import io.opentelemetry.api.trace.Tracer;
+import io.opentelemetry.api.trace.propagation.W3CTraceContextPropagator;
+import io.opentelemetry.context.Context;
+import io.opentelemetry.context.Scope;
+import io.opentelemetry.context.propagation.ContextPropagators;
+import io.opentelemetry.context.propagation.TextMapPropagator;
+import io.opentelemetry.sdk.OpenTelemetrySdk;
+import io.opentelemetry.sdk.trace.SdkTracerProvider;
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicReference;
+import org.junit.Assume;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+@RunWith(Parameterized.class)
+public class OpenTelemetryContextPropagationTest extends AbstractInteropTest {
+  private final OpenTelemetrySdk openTelemetrySdk;
+  private final Tracer tracer;
+  private final GrpcOpenTelemetry grpcOpenTelemetry;
+  private final AtomicReference<Span> applicationSpan = new AtomicReference<>();
+  private final boolean censusClient;
+
+  @Parameterized.Parameters(name = "ContextPropagator={0}, CensusClient={1}")
+  public static Iterable<Object[]> data() {
+    return Arrays.asList(new Object[][] {
+        {W3CTraceContextPropagator.getInstance(), false},
+        {GrpcTraceBinContextPropagator.defaultInstance(), false},
+        {GrpcTraceBinContextPropagator.defaultInstance(), true}
+    });
+  }
+
+  public OpenTelemetryContextPropagationTest(TextMapPropagator textMapPropagator,
+                                             boolean isCensusClient) {
+    this.openTelemetrySdk = OpenTelemetrySdk.builder()
+        .setTracerProvider(SdkTracerProvider.builder().build())
+        .setPropagators(ContextPropagators.create(TextMapPropagator.composite(
+            textMapPropagator
+        )))
+        .build();
+    this.tracer = openTelemetrySdk
+        .getTracer("grpc-java-interop-test");
+    GrpcOpenTelemetry.Builder grpcOpentelemetryBuilder = GrpcOpenTelemetry.newBuilder()
+        .sdk(openTelemetrySdk);
+    InternalGrpcOpenTelemetry.enableTracing(grpcOpentelemetryBuilder, true);
+    grpcOpenTelemetry = grpcOpentelemetryBuilder.build();
+    this.censusClient = isCensusClient;
+  }
+
+  @Override
+  protected ServerBuilder<?> getServerBuilder() {
+    NettyServerBuilder builder = NettyServerBuilder.forPort(0, InsecureServerCredentials.create())
+        .maxInboundMessageSize(AbstractInteropTest.MAX_MESSAGE_SIZE);
+    builder.intercept(new ServerInterceptor() {
+      @Override
+      public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(ServerCall<ReqT, RespT> call,
+          Metadata headers, ServerCallHandler<ReqT, RespT> next) {
+        ServerCall.Listener<ReqT> listener = next.startCall(call, headers);
+        return new ForwardingServerCallListener<ReqT>() {
+          @Override
+          protected ServerCall.Listener<ReqT> delegate() {
+            return listener;
+          }
+
+          @Override
+          public void onMessage(ReqT request) {
+            applicationSpan.set(tracer.spanBuilder("InteropTest.Application.Span").startSpan());
+            delegate().onMessage(request);
+          }
+
+          @Override
+          public void onHalfClose() {
+            maybeCloseSpan(applicationSpan);
+            delegate().onHalfClose();
+          }
+
+          @Override
+          public void onCancel() {
+            maybeCloseSpan(applicationSpan);
+            delegate().onCancel();
+          }
+
+          @Override
+          public void onComplete() {
+            maybeCloseSpan(applicationSpan);
+            delegate().onComplete();
+          }
+        };
+      }
+    });
+    // To ensure proper propagation of remote spans from gRPC to your application, this interceptor
+    // must be after any application interceptors that interact with spans. This allows the tracing
+    // information to be correctly passed along. However, it's fine for application-level onMessage
+    // handlers to access the span.
+    grpcOpenTelemetry.configureServerBuilder(builder);
+    return builder;
+  }
+
+  private void maybeCloseSpan(AtomicReference<Span> applicationSpan) {
+    Span tmp = applicationSpan.get();
+    if (tmp != null) {
+      tmp.end();
+    }
+  }
+
+  @Override
+  protected boolean metricsExpected() {
+    return false;
+  }
+
+  @Override
+  protected ManagedChannelBuilder<?> createChannelBuilder() {
+    NettyChannelBuilder builder = NettyChannelBuilder.forAddress(getListenAddress())
+        .maxInboundMessageSize(AbstractInteropTest.MAX_MESSAGE_SIZE)
+        .usePlaintext();
+    if (!censusClient) {
+      // Disabling census-tracing is necessary to avoid trace ID mismatches.
+      // This is because census-tracing overrides the grpc-trace-bin header with
+      // OpenTelemetry's GrpcTraceBinPropagator.
+      InternalNettyChannelBuilder.setTracingEnabled(builder, false);
+      grpcOpenTelemetry.configureChannelBuilder(builder);
+    }
+    return builder;
+  }
+
+  @Test
+  public void otelSpanContextPropagation() {
+    Assume.assumeFalse(censusClient);
+    Span parentSpan = tracer.spanBuilder("Test.interopTest").startSpan();
+    try (Scope scope = Context.current().with(parentSpan).makeCurrent()) {
+      blockingStub.unaryCall(SimpleRequest.getDefaultInstance());
+    }
+    assertEquals(parentSpan.getSpanContext().getTraceId(),
+        applicationSpan.get().getSpanContext().getTraceId());
+  }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void censusToOtelGrpcTraceBinPropagator() {
+    Assume.assumeTrue(censusClient);
+    io.opencensus.trace.Tracer censusTracer = io.opencensus.trace.Tracing.getTracer();
+    io.opencensus.trace.Span parentSpan = censusTracer.spanBuilder("Test.interopTest")
+        .startSpan();
+    io.grpc.Context context =  io.opencensus.trace.unsafe.ContextUtils.withValue(
+        io.grpc.Context.current(), parentSpan);
+    io.grpc.Context previous = context.attach();
+    try {
+      blockingStub.unaryCall(SimpleRequest.getDefaultInstance());
+      assertEquals(parentSpan.getContext().getTraceId().toLowerBase16(),
+          applicationSpan.get().getSpanContext().getTraceId());
+    } finally {
+      context.detach(previous);
+    }
+  }
+}