Revert "feat(bigtable): populate alts field in channel entry (#2702)"

This reverts commit 1bfb763.

Author: sushanb

google-cloud-bigtable/pom.xml

@@ -204,10 +204,6 @@
       <groupId>io.grpc</groupId>
       <artifactId>grpc-netty-shaded</artifactId>
     </dependency>
-    <dependency>
-      <groupId>io.grpc</groupId>
-      <artifactId>grpc-alts</artifactId>
-    </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-protobuf</artifactId>

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/gaxx/grpc/BigtableChannelPool.java

@@ -30,7 +30,6 @@
 import io.grpc.Metadata;
 import io.grpc.MethodDescriptor;
 import io.grpc.Status;
-import io.grpc.alts.AltsContextUtil;
 import java.io.IOException;
 import java.time.Clock;
 import java.util.ArrayList;
@@ -566,8 +565,9 @@ static class Entry implements BigtableChannelObserver {
     }
 
     void checkAndSetIsAlts(ClientCall<?, ?> call) {
-      boolean currentIsAlts = AltsContextUtil.check(call);
-      isAltsHolder.set(currentIsAlts);
+      // TODO(populate ALTS holder)
+      boolean result = false;
+      isAltsHolder.compareAndSet(null, result);
     }
 
     ManagedChannel getManagedChannel() {

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/gaxx/grpc/BigtableChannelPoolTest.java

@@ -21,7 +21,6 @@
 
 import com.google.api.gax.grpc.ChannelFactory;
 import com.google.common.collect.Iterables;
-import io.grpc.Attributes;
 import io.grpc.CallOptions;
 import io.grpc.ClientCall;
 import io.grpc.ManagedChannel;
@@ -113,8 +112,6 @@ public void setUp() throws IOException {
     // Capture the listener when start is called
     // Configure mockClientCall.start to capture the listener
     doNothing().when(mockClientCall).start(listenerCaptor.capture(), any(Metadata.class));
-    // Default to no ALTS context
-    when(mockClientCall.getAttributes()).thenReturn(Attributes.EMPTY);
   }
 
   private BigtableChannelPool.Entry getSingleEntry() {
@@ -236,16 +233,4 @@ public void testMixedRpcs() {
     assertThat(entry.getAndResetErrorCount()).isEqualTo(1); // The last failure
     assertThat(entry.totalOutstandingRpcs()).isEqualTo(0);
   }
-
-  @Test
-  public void testNonAltsChannelReturnsFalse() {
-    // empty attributes
-    // cannot test true value as logic is complicated.
-    // alts check looks at  attributes.get(AltsProtocolNegotiator.AUTH_CONTEXT_KEY);
-    when(mockClientCall.getAttributes()).thenReturn(Attributes.EMPTY);
-    BigtableChannelPool.Entry entry = getSingleEntry();
-    assertThat(entry.isAltsHolder.get()).isNull();
-    startCall(unaryMethodDescriptor);
-    assertThat(entry.isAltsChannel()).isFalse();
-  }
 }