fix: Make refreshing channel compatible with BigtableDataClientFactory (

#474)

Set up channel priming in EnhancedBigtableStubSettings when refreshingChannel is true. BigtableDataClientFactory will set up refreshing channels in the shared client context. Derivative clients cannot reconfigure this setting and will all have refreshing channels.

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/BigtableDataClientFactory.java

@@ -23,7 +23,7 @@
 import com.google.api.gax.rpc.FixedHeaderProvider;
 import com.google.api.gax.rpc.FixedTransportChannelProvider;
 import com.google.api.gax.rpc.FixedWatchdogProvider;
-import com.google.api.gax.rpc.StubSettings;
+import com.google.cloud.bigtable.data.v2.stub.EnhancedBigtableStubSettings;
 import java.io.IOException;
 import javax.annotation.Nonnull;
 
@@ -189,8 +189,11 @@ public BigtableDataClient createForInstance(
   }
 
   // Update stub settings to use shared resources in this factory
-  private void patchStubSettings(StubSettings.Builder stubSettings) {
+  private void patchStubSettings(EnhancedBigtableStubSettings.Builder stubSettings) {
     stubSettings
+        // Channel refreshing will be configured in the shared ClientContext. Derivative clients
+        // won't be able to reconfigure the refreshing logic
+        .setRefreshingChannel(false)
         .setTransportChannelProvider(
             FixedTransportChannelProvider.create(sharedClientContext.getTransportChannel()))
         .setCredentialsProvider(

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java

@@ -20,6 +20,7 @@
 import com.google.api.gax.batching.BatchingSettings;
 import com.google.api.gax.batching.FlowControlSettings;
 import com.google.api.gax.batching.FlowController.LimitExceededBehavior;
+import com.google.api.gax.core.FixedCredentialsProvider;
 import com.google.api.gax.core.GoogleCredentialsProvider;
 import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
 import com.google.api.gax.retrying.RetrySettings;
@@ -29,6 +30,7 @@
 import com.google.api.gax.rpc.StubSettings;
 import com.google.api.gax.rpc.TransportChannelProvider;
 import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.auth.Credentials;
 import com.google.cloud.bigtable.Version;
 import com.google.cloud.bigtable.data.v2.models.ConditionalRowMutation;
 import com.google.cloud.bigtable.data.v2.models.KeyOffset;
@@ -42,6 +44,7 @@
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
+import java.io.IOException;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -787,6 +790,22 @@ public EnhancedBigtableStubSettings build() {
         Preconditions.checkArgument(
             getTransportChannelProvider() instanceof InstantiatingGrpcChannelProvider,
             "refreshingChannel only works with InstantiatingGrpcChannelProviders");
+        InstantiatingGrpcChannelProvider.Builder channelProviderBuilder =
+            ((InstantiatingGrpcChannelProvider) getTransportChannelProvider()).toBuilder();
+        Credentials credentials = null;
+        if (getCredentialsProvider() != null) {
+          try {
+            credentials = getCredentialsProvider().getCredentials();
+          } catch (IOException e) {
+            throw new RuntimeException(e);
+          }
+        }
+        // Use shared credentials
+        this.setCredentialsProvider(FixedCredentialsProvider.create(credentials));
+        channelProviderBuilder.setChannelPrimer(
+            BigtableChannelPrimer.create(
+                credentials, projectId, instanceId, appProfileId, primedTableIds));
+        this.setTransportChannelProvider(channelProviderBuilder.build());
       }
       return new EnhancedBigtableStubSettings(this);
     }

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/BigtableDataClientFactoryTest.java

@@ -18,19 +18,32 @@
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.api.core.ApiClock;
+import com.google.api.core.ApiFunction;
 import com.google.api.gax.core.CredentialsProvider;
 import com.google.api.gax.core.ExecutorProvider;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
 import com.google.api.gax.rpc.TransportChannelProvider;
 import com.google.api.gax.rpc.WatchdogProvider;
 import com.google.bigtable.v2.BigtableGrpc;
 import com.google.bigtable.v2.MutateRowRequest;
 import com.google.bigtable.v2.MutateRowResponse;
+import com.google.bigtable.v2.ReadRowsRequest;
+import com.google.bigtable.v2.ReadRowsResponse;
+import com.google.bigtable.v2.RowFilter;
+import com.google.bigtable.v2.RowSet;
 import com.google.cloud.bigtable.data.v2.internal.NameUtil;
 import com.google.cloud.bigtable.data.v2.models.RowMutation;
 import com.google.common.base.Preconditions;
+import com.google.protobuf.ByteString;
+import io.grpc.Attributes;
+import io.grpc.ServerTransportFilter;
 import io.grpc.stub.StreamObserver;
 import java.io.IOException;
 import java.lang.reflect.Method;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingDeque;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
@@ -60,16 +73,33 @@ public class BigtableDataClientFactoryTest {
   private WatchdogProvider watchdogProvider;
   private ApiClock apiClock;
   private BigtableDataSettings defaultSettings;
+  private int port;
+
+  private final BlockingQueue<Attributes> setUpAttributes = new LinkedBlockingDeque<>();
+  private final BlockingQueue<Attributes> terminateAttributes = new LinkedBlockingDeque<>();
 
   @Before
   public void setUp() throws IOException {
     service = new FakeBigtableService();
-
-    serviceHelper = new FakeServiceHelper(service);
+    ServerTransportFilter transportFilter =
+        new ServerTransportFilter() {
+          @Override
+          public Attributes transportReady(Attributes transportAttrs) {
+            setUpAttributes.add(transportAttrs);
+            return super.transportReady(transportAttrs);
+          }
+
+          @Override
+          public void transportTerminated(Attributes transportAttrs) {
+            terminateAttributes.add(transportAttrs);
+          }
+        };
+    serviceHelper = new FakeServiceHelper(null, transportFilter, service);
+    port = serviceHelper.getPort();
     serviceHelper.start();
 
     BigtableDataSettings.Builder builder =
-        BigtableDataSettings.newBuilderForEmulator(serviceHelper.getPort())
+        BigtableDataSettings.newBuilderForEmulator(port)
             .setProjectId(DEFAULT_PROJECT_ID)
             .setInstanceId(DEFAULT_INSTANCE_ID)
             .setAppProfileId(DEFAULT_APP_PROFILE_ID);
@@ -191,8 +221,94 @@ public void testCreateForInstanceWithAppProfileHasCorrectSettings() throws Excep
     assertThat(service.lastRequest.getAppProfileId()).isEqualTo("other-app-profile");
   }
 
+  @Test
+  public void testCreateWithRefreshingChannel() throws Exception {
+    String[] tableIds = {"fake-table1", "fake-table2"};
+    int poolSize = 3;
+    BigtableDataSettings.Builder builder =
+        BigtableDataSettings.newBuilderForEmulator(port)
+            .setProjectId(DEFAULT_PROJECT_ID)
+            .setInstanceId(DEFAULT_INSTANCE_ID)
+            .setAppProfileId(DEFAULT_APP_PROFILE_ID)
+            .setPrimingTableIds(tableIds)
+            .setRefreshingChannel(true);
+    builder
+        .stubSettings()
+        .setCredentialsProvider(credentialsProvider)
+        .setStreamWatchdogProvider(watchdogProvider)
+        .setExecutorProvider(executorProvider);
+    InstantiatingGrpcChannelProvider channelProvider =
+        (InstantiatingGrpcChannelProvider) builder.stubSettings().getTransportChannelProvider();
+    InstantiatingGrpcChannelProvider.Builder channelProviderBuilder = channelProvider.toBuilder();
+    channelProviderBuilder.setPoolSize(poolSize);
+    builder.stubSettings().setTransportChannelProvider(channelProviderBuilder.build());
+
+    BigtableDataClientFactory factory = BigtableDataClientFactory.create(builder.build());
+    factory.createDefault();
+    factory.createForAppProfile("other-appprofile");
+    factory.createForInstance("other-project", "other-instance");
+
+    // Make sure that only 1 instance is created for all clients
+    Mockito.verify(credentialsProvider, Mockito.times(1)).getCredentials();
+    Mockito.verify(executorProvider, Mockito.times(1)).getExecutor();
+    Mockito.verify(watchdogProvider, Mockito.times(1)).getWatchdog();
+
+    // Make sure that the clients are sharing the same ChannelPool
+    assertThat(setUpAttributes).hasSize(poolSize);
+
+    // Make sure that prime requests were sent only once per table per connection
+    assertThat(service.readRowsRequests).hasSize(poolSize * tableIds.length);
+    List<ReadRowsRequest> expectedRequests = new LinkedList<>();
+    for (String tableId : tableIds) {
+      for (int i = 0; i < poolSize; i++) {
+        expectedRequests.add(
+            ReadRowsRequest.newBuilder()
+                .setTableName(
+                    String.format(
+                        "projects/%s/instances/%s/tables/%s",
+                        DEFAULT_PROJECT_ID, DEFAULT_INSTANCE_ID, tableId))
+                .setAppProfileId(DEFAULT_APP_PROFILE_ID)
+                .setRows(
+                    RowSet.newBuilder()
+                        .addRowKeys(ByteString.copyFromUtf8("nonexistent-priming-row")))
+                .setFilter(RowFilter.newBuilder().setBlockAllFilter(true).build())
+                .setRowsLimit(1)
+                .build());
+      }
+    }
+    assertThat(service.readRowsRequests).containsExactly(expectedRequests.toArray());
+
+    // Wait for all the connections to close asynchronously
+    factory.close();
+    long sleepTimeMs = 1000;
+    Thread.sleep(sleepTimeMs);
+    // Verify that all the channels are closed
+    assertThat(terminateAttributes).hasSize(poolSize);
+  }
+
   private static class FakeBigtableService extends BigtableGrpc.BigtableImplBase {
+
     volatile MutateRowRequest lastRequest;
+    BlockingQueue<ReadRowsRequest> readRowsRequests = new LinkedBlockingDeque<>();
+    private ApiFunction<ReadRowsRequest, ReadRowsResponse> readRowsCallback =
+        new ApiFunction<ReadRowsRequest, ReadRowsResponse>() {
+          @Override
+          public ReadRowsResponse apply(ReadRowsRequest readRowsRequest) {
+            return ReadRowsResponse.getDefaultInstance();
+          }
+        };
+
+    @Override
+    public void readRows(
+        ReadRowsRequest request, StreamObserver<ReadRowsResponse> responseObserver) {
+      try {
+        readRowsRequests.add(request);
+        responseObserver.onNext(readRowsCallback.apply(request));
+        responseObserver.onCompleted();
+      } catch (RuntimeException e) {
+        responseObserver.onError(e);
+      }
+    }
 
     @Override
     public void mutateRow(
@@ -204,6 +320,7 @@ public void mutateRow(
   }
 
   private static class BuilderAnswer<T> implements Answer {
+
     private final Class<T> targetClass;
     private T targetInstance;
 

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/FakeServiceHelper.java

@@ -19,6 +19,7 @@
 import io.grpc.Server;
 import io.grpc.ServerBuilder;
 import io.grpc.ServerInterceptor;
+import io.grpc.ServerTransportFilter;
 import java.io.IOException;
 import java.net.ServerSocket;
 
@@ -33,13 +34,24 @@ public FakeServiceHelper(BindableService... services) throws IOException {
 
   public FakeServiceHelper(ServerInterceptor interceptor, BindableService... services)
       throws IOException {
+    this(interceptor, null, services);
+  }
+
+  public FakeServiceHelper(
+      ServerInterceptor interceptor,
+      ServerTransportFilter transportFilter,
+      BindableService... services)
+      throws IOException {
     try (ServerSocket ss = new ServerSocket(0)) {
       port = ss.getLocalPort();
     }
     ServerBuilder builder = ServerBuilder.forPort(port);
     if (interceptor != null) {
       builder = builder.intercept(interceptor);
     }
+    if (transportFilter != null) {
+      builder = builder.addTransportFilter(transportFilter);
+    }
     for (BindableService service : services) {
       builder = builder.addService(service);
     }

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettingsTest.java

@@ -19,20 +19,27 @@
 
 import com.google.api.gax.batching.BatchingSettings;
 import com.google.api.gax.core.CredentialsProvider;
+import com.google.api.gax.core.FixedCredentialsProvider;
 import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
 import com.google.api.gax.retrying.RetrySettings;
 import com.google.api.gax.rpc.ServerStreamingCallSettings;
 import com.google.api.gax.rpc.StatusCode.Code;
 import com.google.api.gax.rpc.UnaryCallSettings;
 import com.google.api.gax.rpc.WatchdogProvider;
+import com.google.auth.Credentials;
 import com.google.cloud.bigtable.data.v2.models.ConditionalRowMutation;
 import com.google.cloud.bigtable.data.v2.models.KeyOffset;
 import com.google.cloud.bigtable.data.v2.models.Query;
 import com.google.cloud.bigtable.data.v2.models.Row;
 import com.google.cloud.bigtable.data.v2.models.RowMutation;
+import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Range;
+import java.io.IOException;
+import java.net.URI;
+import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -61,7 +68,7 @@ public void settingsAreNotLostTest() {
     String projectId = "my-project";
     String instanceId = "my-instance";
     String appProfileId = "my-app-profile-id";
-    boolean isRefreshingChannel = true;
+    boolean isRefreshingChannel = false;
     String endpoint = "some.other.host:123";
     CredentialsProvider credentialsProvider = Mockito.mock(CredentialsProvider.class);
     WatchdogProvider watchdogProvider = Mockito.mock(WatchdogProvider.class);
@@ -612,4 +619,56 @@ public void isRefreshingChannelFalseValueTest() {
     assertThat(builder.build().isRefreshingChannel()).isFalse();
     assertThat(builder.build().toBuilder().isRefreshingChannel()).isFalse();
   }
+
+  @Test
+  public void refreshingChannelSetFixedCredentialProvider() throws Exception {
+    String dummyProjectId = "my-project";
+    String dummyInstanceId = "my-instance";
+    CredentialsProvider credentialsProvider = Mockito.mock(CredentialsProvider.class);
+    FakeCredentials expectedCredentials = new FakeCredentials();
+    Mockito.when(credentialsProvider.getCredentials())
+        .thenReturn(expectedCredentials, new FakeCredentials(), new FakeCredentials());
+    EnhancedBigtableStubSettings.Builder builder =
+        EnhancedBigtableStubSettings.newBuilder()
+            .setProjectId(dummyProjectId)
+            .setInstanceId(dummyInstanceId)
+            .setRefreshingChannel(true)
+            .setCredentialsProvider(credentialsProvider);
+    assertThat(builder.isRefreshingChannel()).isTrue();
+    // Verify that isRefreshing setting is not lost and stubSettings will always return the same
+    // credential
+    EnhancedBigtableStubSettings stubSettings = builder.build();
+    assertThat(stubSettings.isRefreshingChannel()).isTrue();
+    assertThat(stubSettings.getCredentialsProvider()).isInstanceOf(FixedCredentialsProvider.class);
+    assertThat(stubSettings.getCredentialsProvider().getCredentials())
+        .isEqualTo(expectedCredentials);
+    assertThat(stubSettings.toBuilder().isRefreshingChannel()).isTrue();
+    assertThat(stubSettings.toBuilder().getCredentialsProvider().getCredentials())
+        .isEqualTo(expectedCredentials);
+  }
+
+  private static class FakeCredentials extends Credentials {
+    @Override
+    public String getAuthenticationType() {
+      return "fake";
+    }
+
+    @Override
+    public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException {
+      return ImmutableMap.of("my-header", Arrays.asList("fake-credential"));
+    }
+
+    @Override
+    public boolean hasRequestMetadata() {
+      return true;
+    }
+
+    @Override
+    public boolean hasRequestMetadataOnly() {
+      return true;
+    }
+
+    @Override
+    public void refresh() throws IOException {}
+  }
 }