wip: spanner: move admin clients to GAPIC stub

google-cloud-spanner/src/main/java/com/google/cloud/spanner/SpannerImpl.java

@@ -36,6 +36,7 @@
 import com.google.cloud.spanner.Options.ListOption;
 import com.google.cloud.spanner.Options.QueryOption;
 import com.google.cloud.spanner.Options.ReadOption;
+import com.google.cloud.spanner.spi.v1.GapicSpannerRpc;
 import com.google.cloud.spanner.spi.v1.SpannerRpc;
 import com.google.cloud.spanner.spi.v1.SpannerRpc.Paginated;
 import com.google.common.annotations.VisibleForTesting;
@@ -81,7 +82,6 @@
 import io.opencensus.trace.Span;
 import io.opencensus.trace.Tracer;
 import io.opencensus.trace.Tracing;
-
 import java.io.IOException;
 import java.io.Serializable;
 import java.util.AbstractList;
@@ -134,7 +134,8 @@ class SpannerImpl extends BaseService<SpannerOptions> implements Spanner {
   }
 
   private final Random random = new Random();
-  private final SpannerRpc rpc;
+  private final SpannerRpc rawGrpcRpc;
+  private final SpannerRpc gapicRpc;
   private final int defaultPrefetchChunks;
 
   @GuardedBy("this")
@@ -146,16 +147,26 @@ class SpannerImpl extends BaseService<SpannerOptions> implements Spanner {
   @GuardedBy("this")
   private boolean spannerIsClosed = false;
 
-  SpannerImpl(SpannerRpc rpc, int defaultPrefetchChunks, SpannerOptions options) {
+  SpannerImpl(
+      SpannerRpc rawGrpcRpc,
+      SpannerRpc gapicRpc,
+      int defaultPrefetchChunks,
+      SpannerOptions options) {
     super(options);
-    this.rpc = rpc;
+    this.rawGrpcRpc = rawGrpcRpc;
+    this.gapicRpc = gapicRpc;
     this.defaultPrefetchChunks = defaultPrefetchChunks;
-    this.dbAdminClient = new DatabaseAdminClientImpl(options.getProjectId(), rpc);
-    this.instanceClient = new InstanceAdminClientImpl(options.getProjectId(), rpc, dbAdminClient);
+    this.dbAdminClient = new DatabaseAdminClientImpl(options.getProjectId(), gapicRpc);
+    this.instanceClient =
+        new InstanceAdminClientImpl(options.getProjectId(), gapicRpc, dbAdminClient);
   }
 
   SpannerImpl(SpannerOptions options) {
-    this(options.getSpannerRpcV1(), options.getPrefetchChunks(), options);
+    this(
+        options.getSpannerRpcV1(),
+        GapicSpannerRpc.create(options),
+        options.getPrefetchChunks(),
+        options);
   }
 
   private static ExponentialBackOff newBackOff() {
@@ -255,7 +266,8 @@ Session createSession(final DatabaseId db) throws SpannerException {
               new Callable<com.google.spanner.v1.Session>() {
                 @Override
                 public com.google.spanner.v1.Session call() throws Exception {
-                  return rpc.createSession(db.getName(), getOptions().getSessionLabels(), options);
+                  return rawGrpcRpc.createSession(
+                      db.getName(), getOptions().getSessionLabels(), options);
                 }
               });
       span.end();
@@ -794,7 +806,7 @@ public Timestamp writeAtLeastOnce(Iterable<Mutation> mutations) throws SpannerEx
                 new Callable<CommitResponse>() {
                   @Override
                   public CommitResponse call() throws Exception {
-                    return rpc.commit(request, options);
+                    return rawGrpcRpc.commit(request, options);
                   }
                 });
         Timestamp t = Timestamp.fromProto(response.getCommitTimestamp());
@@ -816,7 +828,7 @@ public ReadContext singleUse() {
 
     @Override
     public ReadContext singleUse(TimestampBound bound) {
-      return setActive(new SingleReadContext(this, bound, rpc, defaultPrefetchChunks));
+      return setActive(new SingleReadContext(this, bound, rawGrpcRpc, defaultPrefetchChunks));
     }
 
     @Override
@@ -826,7 +838,8 @@ public ReadOnlyTransaction singleUseReadOnlyTransaction() {
 
     @Override
     public ReadOnlyTransaction singleUseReadOnlyTransaction(TimestampBound bound) {
-      return setActive(new SingleUseReadOnlyTransaction(this, bound, rpc, defaultPrefetchChunks));
+      return setActive(
+          new SingleUseReadOnlyTransaction(this, bound, rawGrpcRpc, defaultPrefetchChunks));
     }
 
     @Override
@@ -836,12 +849,13 @@ public ReadOnlyTransaction readOnlyTransaction() {
 
     @Override
     public ReadOnlyTransaction readOnlyTransaction(TimestampBound bound) {
-      return setActive(new MultiUseReadOnlyTransaction(this, bound, rpc, defaultPrefetchChunks));
+      return setActive(
+          new MultiUseReadOnlyTransaction(this, bound, rawGrpcRpc, defaultPrefetchChunks));
     }
 
     @Override
     public TransactionRunner readWriteTransaction() {
-      return setActive(new TransactionRunnerImpl(this, rpc, defaultPrefetchChunks));
+      return setActive(new TransactionRunnerImpl(this, rawGrpcRpc, defaultPrefetchChunks));
     }
 
     @Override
@@ -858,7 +872,7 @@ public void close() {
             new Callable<Void>() {
               @Override
               public Void call() throws Exception {
-                rpc.deleteSession(name, options);
+                rawGrpcRpc.deleteSession(name, options);
                 return null;
               }
             });
@@ -884,7 +898,7 @@ ByteString beginTransaction() {
                 new Callable<Transaction>() {
                   @Override
                   public Transaction call() throws Exception {
-                    return rpc.beginTransaction(request, options);
+                    return rawGrpcRpc.beginTransaction(request, options);
                   }
                 });
         if (txn.getId().isEmpty()) {

google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java

@@ -98,6 +98,14 @@ public class GapicSpannerRpc implements SpannerRpc {
   private final String projectName;
   private final SpannerMetadataProvider metadataProvider;
 
+  public static GapicSpannerRpc create(SpannerOptions options) {
+    try {
+      return new GapicSpannerRpc(options);
+    } catch (IOException e) {
+      throw new IllegalStateException(e);
+    }
+  }
+
   public GapicSpannerRpc(SpannerOptions options) throws IOException {
     this.projectId = options.getProjectId();
     this.projectName = PROJECT_NAME_TEMPLATE.instantiate("project", this.projectId);

google-cloud-spanner/src/test/java/com/google/cloud/spanner/BatchClientImplTest.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
- 
+
 package com.google.cloud.spanner;
 
 import static com.google.common.truth.Truth.assertThat;
@@ -59,7 +59,7 @@ public final class BatchClientImplTest {
   public void setUp() {
     initMocks(this);
     DatabaseId db = DatabaseId.of(DB_NAME);
-    SpannerImpl spanner = new SpannerImpl(rpc, 1, spannerOptions);
+    SpannerImpl spanner = new SpannerImpl(rpc, rpc, 1, spannerOptions);
     client = new BatchClientImpl(db, spanner);
   }
 

google-cloud-spanner/src/test/java/com/google/cloud/spanner/SessionImplTest.java

@@ -69,7 +69,7 @@ public class SessionImplTest {
   @Before
   public void setUp() {
     MockitoAnnotations.initMocks(this);
-    SpannerImpl spanner = new SpannerImpl(rpc, 1, spannerOptions);
+    SpannerImpl spanner = new SpannerImpl(rpc, rpc, 1, spannerOptions);
     String dbName = "projects/p1/instances/i1/databases/d1";
     String sessionName = dbName + "/sessions/s1";
     DatabaseId db = DatabaseId.of(dbName);

google-cloud-spanner/src/test/java/com/google/cloud/spanner/SpannerImplTest.java

@@ -19,7 +19,6 @@
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.cloud.spanner.spi.v1.SpannerRpc;
-
 import java.util.HashMap;
 import java.util.Map;
 import org.junit.Before;
@@ -44,7 +43,7 @@ public class SpannerImplTest {
   @Before
   public void setUp() {
     MockitoAnnotations.initMocks(this);
-    impl = new SpannerImpl(rpc, 1, spannerOptions);
+    impl = new SpannerImpl(rpc, rpc, 1, spannerOptions);
   }
 
   @Test