gcp-observability: add grpc-census as a dependency and update opencensus version (grpc#9140)

Author: DNVindhya

Diff for: build.gradle

@@ -60,7 +60,7 @@ subprojects {
         googleauthVersion = '1.4.0'
         protobufVersion = '3.19.2'
         protocVersion = protobufVersion
-        opencensusVersion = '0.28.0'
+        opencensusVersion = '0.31.0'
         autovalueVersion = '1.9'
 
         configureProtoCompilation = {

Diff for: census/src/main/java/io/grpc/census/CensusTracingModule.java

@@ -41,7 +41,6 @@
 import io.opencensus.trace.Status;
 import io.opencensus.trace.Tracer;
 import io.opencensus.trace.propagation.BinaryFormat;
-import io.opencensus.trace.unsafe.ContextUtils;
 import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -366,12 +365,18 @@ public void streamClosed(io.grpc.Status status) {
       span.end(createEndSpanOptions(status, isSampledToLocalTracing));
     }
 
+    /*
+     TODO(dnvindhya): Replace deprecated ContextUtils usage with ContextHandleUtils to interact
+     with io.grpc.Context as described in {@link io.opencensus.trace.unsafeContextUtils} to remove
+     SuppressWarnings annotation.
+    */
+    @SuppressWarnings("deprecation")
     @Override
     public Context filterContext(Context context) {
       // Access directly the unsafe trace API to create the new Context. This is a safe usage
       // because gRPC always creates a new Context for each of the server calls and does not
       // inherit from the parent Context.
-      return ContextUtils.withValue(context, span);
+      return io.opencensus.trace.unsafe.ContextUtils.withValue(context, span);
     }
 
     @Override
@@ -404,6 +409,8 @@ public ServerStreamTracer newServerStreamTracer(String fullMethodName, Metadata
 
   @VisibleForTesting
   final class TracingClientInterceptor implements ClientInterceptor {
+
+    @SuppressWarnings("deprecation")
     @Override
     public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
         MethodDescriptor<ReqT, RespT> method, CallOptions callOptions, Channel next) {
@@ -412,7 +419,8 @@ public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
       // as Tracer.getCurrentSpan() except when no value available when the return value is null
       // for the direct access and BlankSpan when Tracer API is used.
       final CallAttemptsTracerFactory tracerFactory =
-          newClientCallTracer(ContextUtils.getValue(Context.current()), method);
+          newClientCallTracer(
+              io.opencensus.trace.unsafe.ContextUtils.getValue(Context.current()), method);
       ClientCall<ReqT, RespT> call =
           next.newCall(
               method,

Diff for: census/src/test/java/io/grpc/census/CensusModulesTest.java

@@ -95,7 +95,6 @@
 import io.opencensus.trace.Tracer;
 import io.opencensus.trace.propagation.BinaryFormat;
 import io.opencensus.trace.propagation.SpanContextParseException;
-import io.opencensus.trace.unsafe.ContextUtils;
 import java.io.InputStream;
 import java.util.HashSet;
 import java.util.List;
@@ -247,6 +246,7 @@ public void clientInterceptorCustomTag() {
   // Test that Census ClientInterceptors uses the TagContext and Span out of the current Context
   // to create the ClientCallTracer, and that it intercepts ClientCall.Listener.onClose() to call
   // ClientCallTracer.callEnded().
+  @SuppressWarnings("deprecation")
   private void testClientInterceptors(boolean nonDefaultContext) {
     grpcServerRule.getServiceRegistry().addService(
         ServerServiceDefinition.builder("package1.service2").addMethod(
@@ -284,7 +284,7 @@ public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
                   .emptyBuilder()
                   .putLocal(StatsTestUtils.EXTRA_TAG, TagValue.create("extra value"))
                   .build());
-      ctx = ContextUtils.withValue(ctx, fakeClientParentSpan);
+      ctx =  io.opencensus.trace.unsafe.ContextUtils.withValue(ctx, fakeClientParentSpan);
       Context origCtx = ctx.attach();
       try {
         call = interceptedChannel.newCall(method, CALL_OPTIONS);
@@ -295,7 +295,8 @@ public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
       assertEquals(
           io.opencensus.tags.unsafe.ContextUtils.getValue(Context.ROOT),
           io.opencensus.tags.unsafe.ContextUtils.getValue(Context.current()));
-      assertEquals(ContextUtils.getValue(Context.current()), BlankSpan.INSTANCE);
+      assertEquals(io.opencensus.trace.unsafe.ContextUtils.getValue(Context.current()),
+          BlankSpan.INSTANCE);
       call = interceptedChannel.newCall(method, CALL_OPTIONS);
     }
 
@@ -1035,6 +1036,7 @@ public void statsHeaderMalformed() {
     assertSame(tagger.empty(), headers.get(censusStats.statsHeader));
   }
 
+  @SuppressWarnings("deprecation")
   @Test
   public void traceHeadersPropagateSpanContext() throws Exception {
     CallAttemptsTracerFactory callTracer =
@@ -1062,7 +1064,7 @@ public void traceHeadersPropagateSpanContext() throws Exception {
     verify(spyServerSpanBuilder).setRecordEvents(eq(true));
 
     Context filteredContext = serverTracer.filterContext(Context.ROOT);
-    assertSame(spyServerSpan, ContextUtils.getValue(filteredContext));
+    assertSame(spyServerSpan, io.opencensus.trace.unsafe.ContextUtils.getValue(filteredContext));
   }
 
   @Test
@@ -1279,6 +1281,7 @@ private void subtestServerBasicStatsNoHeaders(
     }
   }
 
+  @SuppressWarnings("deprecation")
   @Test
   public void serverBasicTracingNoHeaders() {
     ServerStreamTracer.Factory tracerFactory = censusTracing.getServerTracerFactory();
@@ -1290,7 +1293,7 @@ public void serverBasicTracingNoHeaders() {
     verify(spyServerSpanBuilder).setRecordEvents(eq(true));
 
     Context filteredContext = serverStreamTracer.filterContext(Context.ROOT);
-    assertSame(spyServerSpan, ContextUtils.getValue(filteredContext));
+    assertSame(spyServerSpan, io.opencensus.trace.unsafe.ContextUtils.getValue(filteredContext));
 
     serverStreamTracer.serverCallStarted(
         new CallInfo<>(method, Attributes.EMPTY, null));

Diff for: gcp-observability/build.gradle

@@ -21,16 +21,19 @@ description = "gRPC: Google Cloud Platform Observability"
 
 dependencies {
     def cloudLoggingVersion = '3.6.1'
+    def opencensusExporterVersion = '0.31.0'
 
     annotationProcessor libraries.autovalue
     api project(':grpc-api')
-
+    
     implementation project(':grpc-protobuf'),
             project(':grpc-stub'),
             project(':grpc-alts'),
+            project(':grpc-census'),
             libraries.google_auth_oauth2_http,
             libraries.autovalue_annotation,
             libraries.perfmark,
+            libraries.opencensus_contrib_grpc_metrics,
             ('com.google.guava:guava:31.0.1-jre'),
             ('com.google.errorprone:error_prone_annotations:2.11.0'),
             ('com.google.auth:google-auth-library-credentials:1.4.0'),
@@ -39,7 +42,11 @@ dependencies {
             ('com.google.http-client:google-http-client:1.41.0'),
             ('com.google.http-client:google-http-client-gson:1.41.0'),
             ('com.google.api.grpc:proto-google-common-protos:2.7.1'),
-            ("com.google.cloud:google-cloud-logging:${cloudLoggingVersion}")
+            ("com.google.cloud:google-cloud-logging:${cloudLoggingVersion}"),
+            ("io.opencensus:opencensus-exporter-stats-stackdriver:${opencensusExporterVersion}"),
+            ("io.opencensus:opencensus-exporter-trace-stackdriver:${opencensusExporterVersion}")
+
+    runtimeOnly libraries.opencensus_impl
 
     testImplementation project(':grpc-testing'),
             project(':grpc-testing-proto'),

Diff for: interop-testing/src/main/java/io/grpc/testing/integration/AbstractInteropTest.java

@@ -100,7 +100,6 @@
 import io.opencensus.trace.Span;
 import io.opencensus.trace.SpanContext;
 import io.opencensus.trace.Tracing;
-import io.opencensus.trace.unsafe.ContextUtils;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -1547,6 +1546,7 @@ public void customMetadata() throws Exception {
         Collections.singleton(streamingRequest), Collections.singleton(goldenStreamingResponse));
   }
 
+  @SuppressWarnings("deprecation")
   @Test(timeout = 10000)
   public void censusContextsPropagated() {
     Assume.assumeTrue("Skip the test because server is not in the same process.", server != null);
@@ -1561,7 +1561,7 @@ public void censusContextsPropagated() {
                 .emptyBuilder()
                 .putLocal(StatsTestUtils.EXTRA_TAG, TagValue.create("extra value"))
                 .build());
-    ctx = ContextUtils.withValue(ctx, clientParentSpan);
+    ctx = io.opencensus.trace.unsafe.ContextUtils.withValue(ctx, clientParentSpan);
     Context origCtx = ctx.attach();
     try {
       blockingStub.unaryCall(SimpleRequest.getDefaultInstance());
@@ -1581,7 +1581,7 @@ public void censusContextsPropagated() {
       }
       assertTrue("tag not found", tagFound);
 
-      Span span = ContextUtils.getValue(serverCtx);
+      Span span = io.opencensus.trace.unsafe.ContextUtils.getValue(serverCtx);
       assertNotNull(span);
       SpanContext spanContext = span.getContext();
       assertEquals(clientParentSpan.getContext().getTraceId(), spanContext.getTraceId());