docs(samples): add create cloud storage transfer (#431)

samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateAmazonS3Transfer.java

@@ -77,7 +77,6 @@ public static void createAmazonS3Transfer(String projectId, TransferConfig trans
     } catch (ApiException ex) {
       System.out.print("Amazon s3 transfer was not created." + ex.toString());
     }
-    ;
   }
 }
 // [END bigquerydatatransfer_create_amazons3_transfer]

samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateCloudStorageTransfer.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed 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 com.example.bigquerydatatransfer;
+
+// [START bigquerydatatransfer_create_cloudstorage_transfer]
+import com.google.api.gax.rpc.ApiException;
+import com.google.cloud.bigquery.datatransfer.v1.CreateTransferConfigRequest;
+import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
+import com.google.cloud.bigquery.datatransfer.v1.ProjectName;
+import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+// Sample to create google cloud storage transfer config
+public class CreateCloudStorageTransfer {
+
+  public static void main(String[] args) throws IOException {
+    // TODO(developer): Replace these variables before running the sample.
+    final String projectId = "MY_PROJECT_ID";
+    String datasetId = "MY_DATASET_ID";
+    String tableId = "MY_TABLE_ID";
+    // GCS Uri
+    String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states.csv";
+    String fileFormat = "CSV";
+    String fieldDelimiter = ",";
+    String skipLeadingRows = "1";
+    Map<String, Value> params = new HashMap<>();
+    params.put(
+        "destination_table_name_template", Value.newBuilder().setStringValue(tableId).build());
+    params.put("data_path_template", Value.newBuilder().setStringValue(sourceUri).build());
+    params.put("write_disposition", Value.newBuilder().setStringValue("APPEND").build());
+    params.put("file_format", Value.newBuilder().setStringValue(fileFormat).build());
+    params.put("field_delimiter", Value.newBuilder().setStringValue(fieldDelimiter).build());
+    params.put("skip_leading_rows", Value.newBuilder().setStringValue(skipLeadingRows).build());
+    TransferConfig transferConfig =
+        TransferConfig.newBuilder()
+            .setDestinationDatasetId(datasetId)
+            .setDisplayName("Your Google Cloud Storage Config Name")
+            .setDataSourceId("google_cloud_storage")
+            .setParams(Struct.newBuilder().putAllFields(params).build())
+            .setSchedule("every 24 hours")
+            .build();
+    createCloudStorageTransfer(projectId, transferConfig);
+  }
+
+  public static void createCloudStorageTransfer(String projectId, TransferConfig transferConfig)
+      throws IOException {
+    try (DataTransferServiceClient client = DataTransferServiceClient.create()) {
+      ProjectName parent = ProjectName.of(projectId);
+      CreateTransferConfigRequest request =
+          CreateTransferConfigRequest.newBuilder()
+              .setParent(parent.toString())
+              .setTransferConfig(transferConfig)
+              .build();
+      TransferConfig config = client.createTransferConfig(request);
+      System.out.println("Cloud storage transfer created successfully :" + config.getName());
+    } catch (ApiException ex) {
+      System.out.print("Cloud storage transfer was not created." + ex.toString());
+    }
+  }
+}
+// [END bigquerydatatransfer_create_cloudstorage_transfer]

samples/snippets/src/test/java/com/example/bigquerydatatransfer/CreateCloudStorageTransferIT.java

@@ -0,0 +1,140 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed 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 com.example.bigquerydatatransfer;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.DatasetInfo;
+import com.google.cloud.bigquery.Field;
+import com.google.cloud.bigquery.Schema;
+import com.google.cloud.bigquery.StandardSQLTypeName;
+import com.google.cloud.bigquery.StandardTableDefinition;
+import com.google.cloud.bigquery.TableDefinition;
+import com.google.cloud.bigquery.TableId;
+import com.google.cloud.bigquery.TableInfo;
+import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class CreateCloudStorageTransferIT {
+
+  private static final Logger LOG = Logger.getLogger(CreateCloudStorageTransferIT.class.getName());
+  private static final String ID = UUID.randomUUID().toString().substring(0, 8);
+  private BigQuery bigquery;
+  private ByteArrayOutputStream bout;
+  private String name;
+  private String displayName;
+  private String datasetName;
+  private String tableName;
+  private PrintStream out;
+  private PrintStream originalPrintStream;
+
+  private static final String PROJECT_ID = requireEnvVar("GOOGLE_CLOUD_PROJECT");
+
+  private static String requireEnvVar(String varName) {
+    String value = System.getenv(varName);
+    assertNotNull(
+        "Environment variable " + varName + " is required to perform these tests.",
+        System.getenv(varName));
+    return value;
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("GOOGLE_CLOUD_PROJECT");
+  }
+
+  @Before
+  public void setUp() {
+    displayName = "CLOUD_STORAGE_CONFIG_TEST_" + ID;
+    datasetName = "CLOUD_STORAGE_DATASET_NAME_TEST_" + ID;
+    tableName = "CLOUD_STORAGE_TABLE_NAME_TEST_" + ID;
+    // create a temporary dataset
+    bigquery = BigQueryOptions.getDefaultInstance().getService();
+    bigquery.create(DatasetInfo.of(datasetName));
+    // create a temporary table
+    Schema schema =
+        Schema.of(
+            Field.of("name", StandardSQLTypeName.STRING),
+            Field.of("post_abbr", StandardSQLTypeName.STRING));
+    TableDefinition tableDefinition = StandardTableDefinition.of(schema);
+    TableInfo tableInfo = TableInfo.of(TableId.of(datasetName, tableName), tableDefinition);
+    bigquery.create(tableInfo);
+
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    originalPrintStream = System.out;
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() throws IOException {
+    // Clean up
+    DeleteTransferConfig.deleteTransferConfig(name);
+    // delete a temporary table
+    bigquery.delete(TableId.of(datasetName, tableName));
+    // delete a temporary dataset
+    bigquery.delete(datasetName, BigQuery.DatasetDeleteOption.deleteContents());
+    // restores print statements in the original method
+    System.out.flush();
+    System.setOut(originalPrintStream);
+    LOG.log(Level.INFO, bout.toString());
+  }
+
+  @Test
+  public void testCreateCloudStorageTransfer() throws IOException {
+    String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states.csv";
+    String fileFormat = "CSV";
+    String fieldDelimiter = ",";
+    String skipLeadingRows = "1";
+    Map<String, Value> params = new HashMap<>();
+    params.put(
+        "destination_table_name_template", Value.newBuilder().setStringValue(tableName).build());
+    params.put("data_path_template", Value.newBuilder().setStringValue(sourceUri).build());
+    params.put("write_disposition", Value.newBuilder().setStringValue("APPEND").build());
+    params.put("file_format", Value.newBuilder().setStringValue(fileFormat).build());
+    params.put("field_delimiter", Value.newBuilder().setStringValue(fieldDelimiter).build());
+    params.put("skip_leading_rows", Value.newBuilder().setStringValue(skipLeadingRows).build());
+    TransferConfig transferConfig =
+        TransferConfig.newBuilder()
+            .setDestinationDatasetId(datasetName)
+            .setDisplayName(displayName)
+            .setDataSourceId("google_cloud_storage")
+            .setParams(Struct.newBuilder().putAllFields(params).build())
+            .setSchedule("every 24 hours")
+            .build();
+    CreateCloudStorageTransfer.createCloudStorageTransfer(PROJECT_ID, transferConfig);
+    String result = bout.toString();
+    name = result.substring(result.indexOf(":") + 1, result.length() - 1);
+    assertThat(result).contains("Cloud storage transfer created successfully :");
+  }
+}