feat: CreateDatabaseIfNotExists method for async client

client/src/main/java/com/tigrisdata/db/client/StandardTigrisDBAsyncClient.java

@@ -18,21 +18,27 @@
 import com.tigrisdata.db.api.v1.grpc.Api;
 import com.tigrisdata.db.api.v1.grpc.TigrisDBGrpc;
 import static com.tigrisdata.db.client.ErrorMessages.CREATE_DB_FAILED;
+import static com.tigrisdata.db.client.ErrorMessages.DB_ALREADY_EXISTS;
 import static com.tigrisdata.db.client.ErrorMessages.DROP_DB_FAILED;
 import static com.tigrisdata.db.client.ErrorMessages.LIST_DBS_FAILED;
 import static com.tigrisdata.db.client.TypeConverter.toCreateDatabaseRequest;
 import static com.tigrisdata.db.client.TypeConverter.toDropDatabaseRequest;
 import static com.tigrisdata.db.client.TypeConverter.toListDatabasesRequest;
 import com.tigrisdata.db.client.auth.AuthorizationToken;
 import com.tigrisdata.db.client.config.TigrisDBConfiguration;
+import com.tigrisdata.db.client.error.TigrisDBException;
 import io.grpc.ManagedChannel;
 import io.grpc.ManagedChannelBuilder;
+import io.grpc.Status;
+import io.grpc.StatusRuntimeException;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
+import java.util.function.BiConsumer;
 
 /** Async client for TigrisDB */
 public class StandardTigrisDBAsyncClient extends AbstractTigrisDBClient
@@ -119,22 +125,22 @@ public CompletableFuture<List<TigrisAsyncDatabase>> listDatabases(
   }
 
   @Override
-  public CompletableFuture<TigrisDBResponse> createDatabase(
-      String databaseName, DatabaseOptions databaseOptions) {
+  public CompletableFuture<TigrisDBResponse> createDatabaseIfNotExists(String databaseName) {
     ListenableFuture<Api.CreateDatabaseResponse> createDatabaseResponse =
-        stub.createDatabase(toCreateDatabaseRequest(databaseName, databaseOptions));
+        stub.createDatabase(
+            toCreateDatabaseRequest(databaseName, DatabaseOptions.DEFAULT_INSTANCE));
     return Utilities.transformFuture(
         createDatabaseResponse,
         apiResponse -> new TigrisDBResponse(apiResponse.getMsg()),
         executor,
-        CREATE_DB_FAILED);
+        CREATE_DB_FAILED,
+        Optional.of(CreateDatabaseExceptionHandler.DEFAULT_INSTANCE));
   }
 
   @Override
-  public CompletableFuture<TigrisDBResponse> dropDatabase(
-      String databaseName, DatabaseOptions databaseOptions) {
+  public CompletableFuture<TigrisDBResponse> dropDatabase(String databaseName) {
     ListenableFuture<Api.DropDatabaseResponse> dropDatabaseResponse =
-        stub.dropDatabase(toDropDatabaseRequest(databaseName, databaseOptions));
+        stub.dropDatabase(toDropDatabaseRequest(databaseName, DatabaseOptions.DEFAULT_INSTANCE));
     return Utilities.transformFuture(
         dropDatabaseResponse,
         apiResponse -> new TigrisDBResponse(apiResponse.getMsg()),
@@ -151,4 +157,28 @@ public void close() {
   ManagedChannel getChannel() {
     return channel;
   }
+
+  /**
+   * This is the exception handler for CreateDatabase operation, here it will swallow the exception
+   * if the server says database already exists, it will pass the exception further otherwise.
+   */
+  static class CreateDatabaseExceptionHandler
+      implements BiConsumer<CompletableFuture<TigrisDBResponse>, Throwable> {
+    static final CreateDatabaseExceptionHandler DEFAULT_INSTANCE =
+        new CreateDatabaseExceptionHandler();
+
+    @Override
+    public void accept(CompletableFuture<TigrisDBResponse> completableFuture, Throwable throwable) {
+      if (throwable instanceof StatusRuntimeException) {
+        if (((StatusRuntimeException) throwable).getStatus().getCode()
+            == Status.ALREADY_EXISTS.getCode()) {
+          // swallow the already exists exception
+          completableFuture.complete(new TigrisDBResponse(DB_ALREADY_EXISTS));
+          return;
+        }
+      }
+      // pass on the error otherwise
+      completableFuture.completeExceptionally(new TigrisDBException(CREATE_DB_FAILED, throwable));
+    }
+  }
 }

client/src/main/java/com/tigrisdata/db/client/StandardTigrisDBClient.java

@@ -87,12 +87,12 @@ public List<TigrisDatabase> listDatabases(DatabaseOptions listDatabaseOptions)
   }
 
   @Override
-  public TigrisDBResponse createDatabaseIfNotExists(
-      String databaseName, DatabaseOptions databaseOptions) throws TigrisDBException {
+  public TigrisDBResponse createDatabaseIfNotExists(String databaseName) throws TigrisDBException {
     Api.CreateDatabaseResponse createDatabaseResponse = null;
     try {
       createDatabaseResponse =
-          stub.createDatabase(toCreateDatabaseRequest(databaseName, databaseOptions));
+          stub.createDatabase(
+              toCreateDatabaseRequest(databaseName, DatabaseOptions.DEFAULT_INSTANCE));
       return new TigrisDBResponse(createDatabaseResponse.getMsg());
     } catch (StatusRuntimeException statusRuntimeException) {
       // ignore the error if the database is already exists
@@ -104,11 +104,10 @@ public TigrisDBResponse createDatabaseIfNotExists(
   }
 
   @Override
-  public TigrisDBResponse dropDatabase(String databaseName, DatabaseOptions databaseOptions)
-      throws TigrisDBException {
+  public TigrisDBResponse dropDatabase(String databaseName) throws TigrisDBException {
     try {
       Api.DropDatabaseResponse dropDatabaseResponse =
-          stub.dropDatabase(toDropDatabaseRequest(databaseName, databaseOptions));
+          stub.dropDatabase(toDropDatabaseRequest(databaseName, DatabaseOptions.DEFAULT_INSTANCE));
       return new TigrisDBResponse(dropDatabaseResponse.getMsg());
     } catch (StatusRuntimeException statusRuntimeException) {
       throw new TigrisDBException(DROP_DB_FAILED, statusRuntimeException);

client/src/main/java/com/tigrisdata/db/client/StandardTigrisDatabase.java

@@ -66,8 +66,7 @@ public List<CollectionInfo> listCollections() throws TigrisDBException {
   }
 
   @Override
-  public TigrisDBResponse createCollectionsInTransaction(List<URL> collectionsSchemas)
-      throws TigrisDBException {
+  public TigrisDBResponse applySchemas(List<URL> collectionsSchemas) throws TigrisDBException {
     TransactionSession transactionSession = null;
     try {
       transactionSession = beginTransaction(new TransactionOptions());
@@ -76,7 +75,7 @@ public TigrisDBResponse createCollectionsInTransaction(List<URL> collectionsSche
         transactionSession.createOrUpdateCollection(schema, CollectionOptions.DEFAULT_INSTANCE);
       }
       transactionSession.commit();
-      return new TigrisDBResponse("Collections creates successfully");
+      return new TigrisDBResponse("Collections created successfully");
     } catch (Exception exception) {
       if (transactionSession != null) {
         transactionSession.rollback();
@@ -86,15 +85,14 @@ public TigrisDBResponse createCollectionsInTransaction(List<URL> collectionsSche
   }
 
   @Override
-  public TigrisDBResponse createCollectionsInTransaction(File schemaDirectory)
-      throws TigrisDBException {
+  public TigrisDBResponse applySchemas(File schemaDirectory) throws TigrisDBException {
     List<URL> schemaURLs = new ArrayList<>();
     try {
       for (File file :
           schemaDirectory.listFiles(file -> file.getName().toLowerCase().endsWith(".json"))) {
         schemaURLs.add(file.toURI().toURL());
       }
-      return createCollectionsInTransaction(schemaURLs);
+      return applySchemas(schemaURLs);
     } catch (NullPointerException | MalformedURLException ex) {
       throw new TigrisDBException("Failed to process schemaDirectory", ex);
     }

client/src/main/java/com/tigrisdata/db/client/TigrisDBAsyncClient.java

@@ -37,22 +37,18 @@ public interface TigrisDBAsyncClient extends Closeable {
   CompletableFuture<List<TigrisAsyncDatabase>> listDatabases(DatabaseOptions listDatabaseOptions);
 
   /**
-   * Creates the database
+   * Creates the database if not already present
    *
    * @param databaseName name of the database
-   * @param databaseOptions options
    * @return a future to the {@link TigrisDBResponse}
    */
-  CompletableFuture<TigrisDBResponse> createDatabase(
-      String databaseName, DatabaseOptions databaseOptions);
+  CompletableFuture<TigrisDBResponse> createDatabaseIfNotExists(String databaseName);
 
   /**
    * Drops the database
    *
    * @param databaseName name of the database
-   * @param databaseOptions options
    * @return a future to the {@link TigrisDBResponse}
    */
-  CompletableFuture<TigrisDBResponse> dropDatabase(
-      String databaseName, DatabaseOptions databaseOptions);
+  CompletableFuture<TigrisDBResponse> dropDatabase(String databaseName);
 }

client/src/main/java/com/tigrisdata/db/client/TigrisDBClient.java

@@ -42,21 +42,17 @@ public interface TigrisDBClient extends Closeable {
    * Creates the database if the database is not already present
    *
    * @param databaseName name of the database
-   * @param databaseOptions options
    * @return an instance of {@link TigrisDBResponse} from server
    * @throws TigrisDBException in case of auth error or any other failure.
    */
-  TigrisDBResponse createDatabaseIfNotExists(String databaseName, DatabaseOptions databaseOptions)
-      throws TigrisDBException;
+  TigrisDBResponse createDatabaseIfNotExists(String databaseName) throws TigrisDBException;
 
   /**
    * Drops the database
    *
    * @param databaseName name of the database
-   * @param databaseOptions options
    * @return an instance of {@link TigrisDBResponse} from server
    * @throws TigrisDBException in case of auth error or any other failure.
    */
-  TigrisDBResponse dropDatabase(String databaseName, DatabaseOptions databaseOptions)
-      throws TigrisDBException;
+  TigrisDBResponse dropDatabase(String databaseName) throws TigrisDBException;
 }

client/src/main/java/com/tigrisdata/db/client/TigrisDatabase.java

@@ -30,23 +30,23 @@ public interface TigrisDatabase {
    */
   List<CollectionInfo> listCollections() throws TigrisDBException;
   /**
-   * Creates the collection in a transaction
+   * Creates or updates the collection schemas on the current database/
    *
    * @param collectionsSchemas list of URL pointing to schema files
    * @return response
    * @throws TigrisDBException in case of an error.
    */
-  TigrisDBResponse createCollectionsInTransaction(List<URL> collectionsSchemas)
-      throws TigrisDBException;
+  TigrisDBResponse applySchemas(List<URL> collectionsSchemas) throws TigrisDBException;
 
   /**
-   * Reads schema files from a directory and creates the collection in a transaction
+   * Reads schema files from a directory and Creates or updates the collection schemas on the
+   * current database.
    *
    * @param schemaDirectory directory containing schema files
    * @return response
    * @throws TigrisDBException in case of an error.
    */
-  TigrisDBResponse createCollectionsInTransaction(File schemaDirectory) throws TigrisDBException;
+  TigrisDBResponse applySchemas(File schemaDirectory) throws TigrisDBException;
   /**
    * Drops the collection.
    *

client/src/main/java/com/tigrisdata/db/client/Utilities.java

@@ -19,16 +19,18 @@
 import com.tigrisdata.db.client.error.TigrisDBException;
 
 import java.util.Iterator;
+import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Executor;
+import java.util.function.BiConsumer;
 import java.util.function.Function;
 
 final class Utilities {
   private Utilities() {}
 
   // TODO update this once server sends the message back
-  public static final String INSERT_SUCCESS_RESPONSE = "inserted";
-  public static final String DELETE_SUCCESS_RESPONSE = "deleted";
+  static final String INSERT_SUCCESS_RESPONSE = "inserted";
+  static final String DELETE_SUCCESS_RESPONSE = "deleted";
 
   /**
    * Converts from {@link Iterator} of Type F to {@link Iterator} of type T
@@ -39,8 +41,7 @@ private Utilities() {}
    * @param <T> destination type
    * @return an instance of {@link Iterator} of type T
    */
-  public static <F, T> Iterator<T> transformIterator(
-      Iterator<F> iterator, Function<F, T> converter) {
+  static <F, T> Iterator<T> transformIterator(Iterator<F> iterator, Function<F, T> converter) {
     return new ConvertedIterator<>(iterator, converter);
   }
 
@@ -54,11 +55,30 @@ public static <F, T> Iterator<T> transformIterator(
    * @param <T> to type
    * @return an instance of {@link CompletableFuture}
    */
-  public static <F, T> CompletableFuture<T> transformFuture(
+  static <F, T> CompletableFuture<T> transformFuture(
       ListenableFuture<F> listenableFuture,
       Function<F, T> converter,
       Executor executor,
       String errorMessage) {
+    return transformFuture(listenableFuture, converter, executor, errorMessage, Optional.empty());
+  }
+  /**
+   * Converts {@link ListenableFuture} of type F to {@link CompletableFuture} of type T
+   *
+   * @param listenableFuture source listenable future
+   * @param converter function that converts type F to type T
+   * @param executor executor to run callback that transforms Future when source Future is complete
+   * @param exceptionHandler handles exception
+   * @param <F> from type
+   * @param <T> to type
+   * @return an instance of {@link CompletableFuture}
+   */
+  static <F, T> CompletableFuture<T> transformFuture(
+      ListenableFuture<F> listenableFuture,
+      Function<F, T> converter,
+      Executor executor,
+      String errorMessage,
+      Optional<BiConsumer<CompletableFuture<T>, Throwable>> exceptionHandler) {
     CompletableFuture<T> result = new CompletableFuture<>();
     Futures.addCallback(
         listenableFuture,
@@ -70,7 +90,11 @@ public void onSuccess(F f) {
 
           @Override
           public void onFailure(Throwable throwable) {
-            result.completeExceptionally(new TigrisDBException(errorMessage, throwable));
+            if (exceptionHandler.isPresent()) {
+              exceptionHandler.get().accept(result, throwable);
+            } else {
+              result.completeExceptionally(new TigrisDBException(errorMessage, throwable));
+            }
           }
         },
         executor);

client/src/test/java/com/tigrisdata/db/client/StandardTigrisDBAsyncClientTest.java

@@ -85,19 +85,26 @@ public void testListDatabases() throws InterruptedException, ExecutionException
   @Test
   public void testCreateDatabase() throws InterruptedException, ExecutionException {
     TigrisDBAsyncClient asyncClient = TestUtils.getTestAsyncClient(SERVER_NAME, grpcCleanup);
-    CompletableFuture<TigrisDBResponse> response =
-        asyncClient.createDatabase("db4", DatabaseOptions.DEFAULT_INSTANCE);
+    CompletableFuture<TigrisDBResponse> response = asyncClient.createDatabaseIfNotExists("db4");
     Assert.assertEquals("db4 created", response.get().getMessage());
     // 4th db created
     Assert.assertEquals(
         4, asyncClient.listDatabases(DatabaseOptions.DEFAULT_INSTANCE).get().size());
   }
 
   @Test
-  public void testDropDatabase() throws InterruptedException, ExecutionException {
+  public void testAlreadyExisingDatabaseCreation() throws InterruptedException, ExecutionException {
     TigrisDBAsyncClient asyncClient = TestUtils.getTestAsyncClient(SERVER_NAME, grpcCleanup);
     CompletableFuture<TigrisDBResponse> response =
-        asyncClient.dropDatabase("db2", DatabaseOptions.DEFAULT_INSTANCE);
+        asyncClient.createDatabaseIfNotExists("pre-existing-db-name");
+    // no exception is thrown, response with message is served
+    Assert.assertEquals("Database already exists", response.get().getMessage());
+  }
+
+  @Test
+  public void testDropDatabase() throws InterruptedException, ExecutionException {
+    TigrisDBAsyncClient asyncClient = TestUtils.getTestAsyncClient(SERVER_NAME, grpcCleanup);
+    CompletableFuture<TigrisDBResponse> response = asyncClient.dropDatabase("db2");
     Assert.assertEquals("db2 dropped", response.get().getMessage());
     // 4th db created
     Assert.assertEquals(

client/src/test/java/com/tigrisdata/db/client/StandardTigrisDBClientFailureTest.java

@@ -59,7 +59,7 @@ public void testCreateDatabase() {
     String dbName = UUID.randomUUID().toString();
     TigrisDBClient client = TestUtils.getTestClient(SERVER_NAME, grpcCleanup);
     try {
-      client.createDatabaseIfNotExists(dbName, DatabaseOptions.DEFAULT_INSTANCE);
+      client.createDatabaseIfNotExists(dbName);
       Assert.fail("This must fail");
     } catch (TigrisDBException tigrisDBException) {
       Assert.assertEquals(
@@ -73,7 +73,7 @@ public void testDropDatabase() {
     String dbName = UUID.randomUUID().toString();
     TigrisDBClient client = TestUtils.getTestClient(SERVER_NAME, grpcCleanup);
     try {
-      client.dropDatabase(dbName, DatabaseOptions.DEFAULT_INSTANCE);
+      client.dropDatabase(dbName);
       Assert.fail("This must fail");
     } catch (TigrisDBException tigrisDBException) {
       Assert.assertEquals(

client/src/test/java/com/tigrisdata/db/client/StandardTigrisDBClientTest.java

@@ -83,8 +83,7 @@ public void testListDatabases() throws TigrisDBException {
   @Test
   public void testCreateDatabase() throws TigrisDBException {
     TigrisDBClient client = TestUtils.getTestClient(SERVER_NAME, grpcCleanup);
-    TigrisDBResponse response =
-        client.createDatabaseIfNotExists("db4", DatabaseOptions.DEFAULT_INSTANCE);
+    TigrisDBResponse response = client.createDatabaseIfNotExists("db4");
     Assert.assertEquals("db4 created", response.getMessage());
     // 4th db created
     Assert.assertEquals(4, client.listDatabases(DatabaseOptions.DEFAULT_INSTANCE).size());
@@ -93,7 +92,7 @@ public void testCreateDatabase() throws TigrisDBException {
   @Test
   public void testDropDatabase() throws TigrisDBException {
     TigrisDBClient client = TestUtils.getTestClient(SERVER_NAME, grpcCleanup);
-    TigrisDBResponse response = client.dropDatabase("db2", DatabaseOptions.DEFAULT_INSTANCE);
+    TigrisDBResponse response = client.dropDatabase("db2");
     Assert.assertEquals("db2 dropped", response.getMessage());
     // 4th db created
     Assert.assertEquals(2, client.listDatabases(DatabaseOptions.DEFAULT_INSTANCE).size());