coufon commented on code in PR #7412:
URL: https://github.com/apache/iceberg/pull/7412#discussion_r1344511751


##########
gcp/src/main/java/org/apache/iceberg/gcp/biglake/BigLakeClient.java:
##########
@@ -0,0 +1,270 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg.gcp.biglake;
+
+import com.google.api.gax.rpc.PermissionDeniedException;
+import com.google.cloud.bigquery.biglake.v1.Catalog;
+import com.google.cloud.bigquery.biglake.v1.CatalogName;
+import com.google.cloud.bigquery.biglake.v1.CreateCatalogRequest;
+import com.google.cloud.bigquery.biglake.v1.CreateDatabaseRequest;
+import com.google.cloud.bigquery.biglake.v1.CreateTableRequest;
+import com.google.cloud.bigquery.biglake.v1.Database;
+import com.google.cloud.bigquery.biglake.v1.DatabaseName;
+import com.google.cloud.bigquery.biglake.v1.DeleteCatalogRequest;
+import com.google.cloud.bigquery.biglake.v1.DeleteDatabaseRequest;
+import com.google.cloud.bigquery.biglake.v1.DeleteTableRequest;
+import com.google.cloud.bigquery.biglake.v1.GetCatalogRequest;
+import com.google.cloud.bigquery.biglake.v1.GetDatabaseRequest;
+import com.google.cloud.bigquery.biglake.v1.GetTableRequest;
+import com.google.cloud.bigquery.biglake.v1.ListDatabasesRequest;
+import com.google.cloud.bigquery.biglake.v1.ListTablesRequest;
+import com.google.cloud.bigquery.biglake.v1.LocationName;
+import com.google.cloud.bigquery.biglake.v1.MetastoreServiceClient;
+import com.google.cloud.bigquery.biglake.v1.MetastoreServiceSettings;
+import com.google.cloud.bigquery.biglake.v1.RenameTableRequest;
+import com.google.cloud.bigquery.biglake.v1.Table;
+import com.google.cloud.bigquery.biglake.v1.TableName;
+import com.google.cloud.bigquery.biglake.v1.UpdateDatabaseRequest;
+import com.google.cloud.bigquery.biglake.v1.UpdateTableRequest;
+import com.google.protobuf.FieldMask;
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.Map;
+import java.util.function.Supplier;
+import org.apache.iceberg.exceptions.AlreadyExistsException;
+import org.apache.iceberg.exceptions.NoSuchNamespaceException;
+import org.apache.iceberg.exceptions.NoSuchTableException;
+import org.apache.iceberg.exceptions.NotAuthorizedException;
+
+/** A client of Google BigLake service. */
+final class BigLakeClient implements Closeable {
+
+  private final MetastoreServiceClient stub;
+
+  /**
+   * Constructs a client of Google BigLake Service.
+   *
+   * @param settings BigLake service settings
+   */
+  BigLakeClient(MetastoreServiceSettings settings) throws IOException {
+    this.stub = MetastoreServiceClient.create(settings);
+  }
+
+  /**
+   * Constructs a client of Google BigLake Service.
+   *
+   * @param biglakeEndpoint BigLake service gRPC endpoint, e.g., 
"biglake.googleapis.com:443"
+   */
+  BigLakeClient(String biglakeEndpoint) throws IOException {
+    
this(MetastoreServiceSettings.newBuilder().setEndpoint(biglakeEndpoint).build());
+  }
+
+  public Catalog createCatalog(CatalogName name, Catalog catalog) {
+    return convertException(
+        () -> {
+          try {
+            return stub.createCatalog(
+                CreateCatalogRequest.newBuilder()
+                    .setParent(LocationName.of(name.getProject(), 
name.getLocation()).toString())
+                    .setCatalogId(name.getCatalog())
+                    .setCatalog(catalog)
+                    .build());
+          } catch (com.google.api.gax.rpc.AlreadyExistsException e) {
+            throw new AlreadyExistsException(e, "Catalog already exists: %s", 
name.getCatalog());
+          }
+        },
+        name.getCatalog());
+  }
+
+  public Catalog catalog(CatalogName name) {
+    try {
+      return 
stub.getCatalog(GetCatalogRequest.newBuilder().setName(name.toString()).build());
+    } catch (PermissionDeniedException e) {
+      throw new NoSuchNamespaceException(
+          e, "Catalog does not exist: %s (or permission denied)", 
name.getCatalog());
+    }
+  }
+
+  public void deleteCatalog(CatalogName name) {
+    try {
+      
stub.deleteCatalog(DeleteCatalogRequest.newBuilder().setName(name.toString()).build());
+    } catch (PermissionDeniedException e) {
+      throw new NoSuchNamespaceException(
+          e, "Catalog does not exist: %s (or permission denied)", 
name.getCatalog());
+    }
+  }
+
+  public Database createDatabase(DatabaseName name, Database db) {
+    return convertException(
+        () -> {
+          try {
+            return stub.createDatabase(
+                CreateDatabaseRequest.newBuilder()
+                    .setParent(
+                        CatalogName.of(name.getProject(), name.getLocation(), 
name.getCatalog())
+                            .toString())
+                    .setDatabaseId(name.getDatabase())
+                    .setDatabase(db)
+                    .build());
+          } catch (com.google.api.gax.rpc.AlreadyExistsException e) {

Review Comment:
   The wrapper convertException will handle PermissionDeniedException and 
convert it to Iceberg's NotAuthorizedException. It is extracted to a wrapper 
for reducing boilerplate code.
   



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