Do not propagate gRPC deadline when propagating OTel context via javaagent. (#5543)

* Add test for early return in gRPC pattern.

* Do not propagate gRPC deadline when propagating OTel context via javaagent.

instrumentation/grpc-1.6/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/grpc/v1_6/GrpcSingletons.java

@@ -20,7 +20,7 @@ public final class GrpcSingletons {
 
   public static final ServerInterceptor SERVER_INTERCEPTOR;
 
-  public static final Context.Storage STORAGE = new ContextStorageBridge();
+  public static final Context.Storage STORAGE = new ContextStorageBridge(false);
 
   static {
     boolean experimentalSpanAttributes =

instrumentation/grpc-1.6/library/src/main/java/io/grpc/override/ContextStorageOverride.java

@@ -14,7 +14,7 @@ import io.opentelemetry.instrumentation.grpc.v1_6.internal.ContextStorageBridge;
  */
 public final class ContextStorageOverride extends Context.Storage {
 
-  private static final Context.Storage delegate = new ContextStorageBridge();
+  private static final Context.Storage delegate = new ContextStorageBridge(true);
 
   @Override
   public Context doAttach(Context toAttach) {

instrumentation/grpc-1.6/library/src/main/java/io/opentelemetry/instrumentation/grpc/v1_6/internal/ContextStorageBridge.java

@@ -28,6 +28,12 @@ public final class ContextStorageBridge extends Context.Storage {
       Context.key("otel-context");
   private static final Context.Key<Scope> OTEL_SCOPE = Context.key("otel-scope");
 
+  private final boolean propagateGrpcDeadline;
+
+  public ContextStorageBridge(boolean propagateGrpcDeadline) {
+    this.propagateGrpcDeadline = propagateGrpcDeadline;
+  }
+
   @Override
   public Context doAttach(Context toAttach) {
     io.opentelemetry.context.Context otelContext = io.opentelemetry.context.Context.current();
@@ -87,6 +93,20 @@ public final class ContextStorageBridge extends Context.Storage {
       // This context has already been previously attached and associated with an OTel context. Just
       // create a new context referring to the current OTel context to reflect the current stack.
       // The previous context is unaffected and will continue to live in its own stack.
+
+      if (!propagateGrpcDeadline) {
+        // Because we are propagating gRPC context via OpenTelemetry here, we may also propagate a
+        // deadline where it
+        // wasn't present before. Notably, this could happen with no user intention when using the
+        // javaagent which will
+        // add OpenTelemetry propagation automatically, and cause that code to fail with a deadline
+        // cancellation. While
+        // ideally we could propagate deadline as well as gRPC intended, we cannot have existing
+        // code fail because it
+        // added the javaagent and choose to fork here.
+        current = current.fork();
+      }
+
       return current.withValue(OTEL_CONTEXT, otelContext);
     }
     return current;

instrumentation/grpc-1.6/testing/src/main/java/io/opentelemetry/instrumentation/grpc/v1_6/AbstractGrpcTest.java

@@ -49,6 +49,8 @@ import io.opentelemetry.semconv.trace.attributes.SemanticAttributes;
 import java.util.Queue;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.stream.Stream;
@@ -1370,6 +1372,87 @@ public abstract class AbstractGrpcTest {
                                                             SemanticAttributes.MESSAGE_ID, 2L))))));
   }
 
+  // Regression test for
+  // https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/4169
+  @Test
+  void clientCallAfterServerCompleted() throws Exception {
+    Server backend =
+        configureServer(
+                ServerBuilder.forPort(0)
+                    .addService(
+                        new GreeterGrpc.GreeterImplBase() {
+                          @Override
+                          public void sayHello(
+                              Helloworld.Request request,
+                              StreamObserver<Helloworld.Response> responseObserver) {
+                            responseObserver.onNext(
+                                Helloworld.Response.newBuilder()
+                                    .setMessage(request.getName())
+                                    .build());
+                            responseObserver.onCompleted();
+                          }
+                        }))
+            .build()
+            .start();
+    ManagedChannel backendChannel = createChannel(backend);
+    closer.add(() -> backendChannel.shutdownNow().awaitTermination(10, TimeUnit.SECONDS));
+    closer.add(() -> backend.shutdownNow().awaitTermination());
+    GreeterGrpc.GreeterBlockingStub backendStub = GreeterGrpc.newBlockingStub(backendChannel);
+
+    // This executor does not propagate context without the javaagent available.
+    ExecutorService executor = Executors.newFixedThreadPool(1);
+    closer.add(executor::shutdownNow);
+
+    CountDownLatch clientCallDone = new CountDownLatch(1);
+    AtomicReference<Throwable> error = new AtomicReference<>();
+
+    Server frontend =
+        configureServer(
+                ServerBuilder.forPort(0)
+                    .addService(
+                        new GreeterGrpc.GreeterImplBase() {
+                          @Override
+                          public void sayHello(
+                              Helloworld.Request request,
+                              StreamObserver<Helloworld.Response> responseObserver) {
+                            responseObserver.onNext(
+                                Helloworld.Response.newBuilder()
+                                    .setMessage(request.getName())
+                                    .build());
+                            responseObserver.onCompleted();
+
+                            executor.execute(
+                                () -> {
+                                  try {
+                                    backendStub.sayHello(request);
+                                  } catch (Throwable t) {
+                                    error.set(t);
+                                  }
+                                  clientCallDone.countDown();
+                                });
+                          }
+                        }))
+            .build()
+            .start();
+    ManagedChannel frontendChannel = createChannel(frontend);
+    closer.add(() -> frontendChannel.shutdownNow().awaitTermination(10, TimeUnit.SECONDS));
+    closer.add(() -> frontend.shutdownNow().awaitTermination());
+
+    GreeterGrpc.GreeterBlockingStub frontendStub = GreeterGrpc.newBlockingStub(frontendChannel);
+    frontendStub.sayHello(Helloworld.Request.newBuilder().setName("test").build());
+
+    // We don't assert on telemetry - the intention of this test is to verify that adding
+    // instrumentation, either as
+    // library or javaagent, does not cause exceptions in the business logic. The produced telemetry
+    // will be different
+    // for the two cases due to lack of context propagation in the library case, but that isn't what
+    // we're testing here.
+
+    clientCallDone.await(10, TimeUnit.SECONDS);
+
+    assertThat(error).hasValue(null);
+  }
+
   private ManagedChannel createChannel(Server server) throws Exception {
     ManagedChannelBuilder<?> channelBuilder =
         configureClient(ManagedChannelBuilder.forAddress("localhost", server.getPort()));