Add import command for data loader CLI

data-loader/cli/src/main/java/com/scalar/db/dataloader/cli/command/dataimport/ImportCommand.java

@@ -1,14 +1,304 @@
 package com.scalar.db.dataloader.cli.command.dataimport;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.scalar.db.api.TableMetadata;
+import com.scalar.db.common.error.CoreError;
+import com.scalar.db.dataloader.core.FileFormat;
+import com.scalar.db.dataloader.core.ScalarDbMode;
+import com.scalar.db.dataloader.core.dataimport.ImportManager;
+import com.scalar.db.dataloader.core.dataimport.ImportOptions;
+import com.scalar.db.dataloader.core.dataimport.controlfile.ControlFile;
+import com.scalar.db.dataloader.core.dataimport.controlfile.ControlFileTable;
+import com.scalar.db.dataloader.core.dataimport.dao.ScalarDbStorageManager;
+import com.scalar.db.dataloader.core.dataimport.dao.ScalarDbTransactionManager;
+import com.scalar.db.dataloader.core.dataimport.log.ImportLoggerConfig;
+import com.scalar.db.dataloader.core.dataimport.log.LogMode;
+import com.scalar.db.dataloader.core.dataimport.log.SingleFileImportLogger;
+import com.scalar.db.dataloader.core.dataimport.log.SplitByDataChunkImportLogger;
+import com.scalar.db.dataloader.core.dataimport.log.writer.DefaultLogWriterFactory;
+import com.scalar.db.dataloader.core.dataimport.log.writer.LogWriterFactory;
+import com.scalar.db.dataloader.core.dataimport.processor.DefaultImportProcessorFactory;
+import com.scalar.db.dataloader.core.dataimport.processor.ImportProcessorFactory;
+import com.scalar.db.dataloader.core.tablemetadata.TableMetadataException;
+import com.scalar.db.dataloader.core.tablemetadata.TableMetadataService;
+import com.scalar.db.dataloader.core.util.TableMetadataUtil;
+import com.scalar.db.service.StorageFactory;
+import com.scalar.db.service.TransactionFactory;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
 import java.util.concurrent.Callable;
+import org.apache.commons.lang3.StringUtils;
 import picocli.CommandLine;
+import picocli.CommandLine.Model.CommandSpec;
+import picocli.CommandLine.ParameterException;
+import picocli.CommandLine.Spec;
 
 @CommandLine.Command(name = "import", description = "Import data into a ScalarDB table")
 public class ImportCommand extends ImportCommandOptions implements Callable<Integer> {
-  @CommandLine.Spec CommandLine.Model.CommandSpec spec;
+
+  /** Spec injected by PicoCli */
+  @Spec CommandSpec spec;
 
   @Override
   public Integer call() throws Exception {
+    validateImportTarget(controlFilePath, namespace, tableName);
+    validateLogDirectory(logDirectory);
+    ControlFile controlFile = parseControlFileFromPath(controlFilePath).orElse(null);
+    ImportOptions importOptions = createImportOptions(controlFile);
+    ImportLoggerConfig config =
+        ImportLoggerConfig.builder()
+            .logDirectoryPath(logDirectory)
+            .isLogRawSourceRecordsEnabled(importOptions.isLogRawRecord())
+            .isLogSuccessRecordsEnabled(importOptions.isLogSuccessRecords())
+            .prettyPrint(prettyPrint)
+            .build();
+    LogWriterFactory logWriterFactory = createLogWriterFactory(config);
+    Map<String, TableMetadata> tableMetadataMap =
+        createTableMetadataMap(controlFile, namespace, tableName);
+    try (BufferedReader reader =
+        Files.newBufferedReader(Paths.get(sourceFilePath), Charset.defaultCharset())) {
+      ImportManager importManager =
+          createImportManager(importOptions, tableMetadataMap, reader, logWriterFactory, config);
+      importManager.startImport();
+    }
     return 0;
   }
+
+  /**
+   * Create LogWriterFactory object
+   *
+   * @return LogWriterFactory object
+   */
+  private LogWriterFactory createLogWriterFactory(ImportLoggerConfig config) {
+    return new DefaultLogWriterFactory(config);
+  }
+
+  /**
+   * Create TableMetadata Map from provided controlfile/ namespace, table name
+   *
+   * @param controlFile control file
+   * @param namespace Namespace
+   * @param tableName Single table name
+   * @return {@code Map<String, TableMetadata>} a table metadata map
+   * @throws ParameterException if one of the argument values is wrong
+   */
+  private Map<String, TableMetadata> createTableMetadataMap(
+      ControlFile controlFile, String namespace, String tableName)
+      throws IOException, TableMetadataException {
+    File configFile = new File(configFilePath);
+    StorageFactory storageFactory = StorageFactory.create(configFile);
+    TableMetadataService tableMetadataService =
+        new TableMetadataService(storageFactory.getStorageAdmin());
+    Map<String, TableMetadata> tableMetadataMap = new HashMap<>();
+    if (controlFile != null) {
+      for (ControlFileTable table : controlFile.getTables()) {
+        tableMetadataMap.put(
+            TableMetadataUtil.getTableLookupKey(table.getNamespace(), table.getTable()),
+            tableMetadataService.getTableMetadata(table.getNamespace(), table.getTable()));
+      }
+    } else {
+      tableMetadataMap.put(
+          TableMetadataUtil.getTableLookupKey(namespace, tableName),
+          tableMetadataService.getTableMetadata(namespace, tableName));
+    }
+    return tableMetadataMap;
+  }
+
+  /**
+   * Create ImportManager object from data
+   *
+   * @param importOptions import options
+   * @param tableMetadataMap table metadata map
+   * @param reader buffered reader with source data
+   * @param logWriterFactory log writer factory object
+   * @param config import logging config
+   * @return ImportManager object
+   */
+  private ImportManager createImportManager(
+      ImportOptions importOptions,
+      Map<String, TableMetadata> tableMetadataMap,
+      BufferedReader reader,
+      LogWriterFactory logWriterFactory,
+      ImportLoggerConfig config)
+      throws IOException {
+    File configFile = new File(configFilePath);
+    ImportProcessorFactory importProcessorFactory = new DefaultImportProcessorFactory();
+    ImportManager importManager;
+    if (scalarDbMode == ScalarDbMode.TRANSACTION) {
+      ScalarDbTransactionManager scalarDbTransactionManager =
+          new ScalarDbTransactionManager(TransactionFactory.create(configFile));
+      importManager =
+          new ImportManager(
+              tableMetadataMap,
+              reader,
+              importOptions,
+              importProcessorFactory,
+              ScalarDbMode.TRANSACTION,
+              null,
+              scalarDbTransactionManager.getDistributedTransactionManager());
+    } else {
+      ScalarDbStorageManager scalarDbStorageManager =
+          new ScalarDbStorageManager(StorageFactory.create(configFile));
+      importManager =
+          new ImportManager(
+              tableMetadataMap,
+              reader,
+              importOptions,
+              importProcessorFactory,
+              ScalarDbMode.STORAGE,
+              scalarDbStorageManager.getDistributedStorage(),
+              null);
+    }
+    if (importOptions.getLogMode().equals(LogMode.SPLIT_BY_DATA_CHUNK)) {
+      importManager.addListener(new SplitByDataChunkImportLogger(config, logWriterFactory));
+    } else importManager.addListener(new SingleFileImportLogger(config, logWriterFactory));
+    return importManager;
+  }
+
+  /**
+   * Validate import targets
+   *
+   * @param controlFilePath control file path
+   * @param namespace Namespace
+   * @param tableName Single table name
+   * @throws ParameterException if one of the argument values is wrong
+   */
+  private void validateImportTarget(String controlFilePath, String namespace, String tableName) {
+    // Throw an error if there was no clear imports target specified
+    if (StringUtils.isBlank(controlFilePath)
+        && (StringUtils.isBlank(namespace) || StringUtils.isBlank(tableName))) {
+      throw new ParameterException(
+          spec.commandLine(), CoreError.DATA_LOADER_IMPORT_TARGET_MISSING.buildMessage());
+    }
+
+    // Make sure the control file exists when a path is provided
+    if (!StringUtils.isBlank(controlFilePath)) {
+      Path path = Paths.get(controlFilePath);
+      if (!Files.exists(path)) {
+        throw new ParameterException(
+            spec.commandLine(),
+            CoreError.DATA_LOADER_MISSING_IMPORT_FILE.buildMessage(
+                controlFilePath, FILE_OPTION_NAME_LONG_FORMAT));
+      }
+    }
+  }
+
+  /**
+   * Validate log directory path
+   *
+   * @param logDirectory log directory path
+   * @throws ParameterException if the path is invalid
+   */
+  private void validateLogDirectory(String logDirectory) throws ParameterException {
+    Path logDirectoryPath;
+    if (!StringUtils.isBlank(logDirectory)) {
+      // User-provided log directory via CLI argument
+      logDirectoryPath = Paths.get(logDirectory);
+
+      if (Files.exists(logDirectoryPath)) {
+        // Check if the provided directory is writable
+        if (!Files.isWritable(logDirectoryPath)) {
+          throw new ParameterException(
+              spec.commandLine(),
+              CoreError.DATA_LOADER_LOG_DIRECTORY_CREATION_FAILED.buildMessage(
+                  logDirectoryPath.toAbsolutePath()));
+        }
+      } else {
+        // Create the log directory if it doesn't exist
+        try {
+          Files.createDirectories(logDirectoryPath);
+        } catch (IOException e) {
+          throw new ParameterException(
+              spec.commandLine(),
+              CoreError.DATA_LOADER_LOG_DIRECTORY_CREATION_FAILED.buildMessage(
+                  logDirectoryPath.toAbsolutePath()));
+        }
+      }
+      return;
+    }
+
+    // Use the current working directory as the log directory
+    logDirectoryPath = Paths.get(System.getProperty("user.dir"));
+
+    // Check if the current working directory is writable
+    if (!Files.isWritable(logDirectoryPath)) {
+      throw new ParameterException(
+          spec.commandLine(),
+          CoreError.DATA_LOADER_LOG_DIRECTORY_WRITE_ACCESS_DENIED.buildMessage(
+              logDirectoryPath.toAbsolutePath()));
+    }
+  }
+
+  /**
+   * Generate control file from a valid control file path
+   *
+   * @param controlFilePath control directory path
+   * @return {@code Optional<ControlFile>} generated control file object
+   * @throws ParameterException if the path is invalid
+   */
+  private Optional<ControlFile> parseControlFileFromPath(String controlFilePath) {
+    if (StringUtils.isBlank(controlFilePath)) {
+      return Optional.empty();
+    }
+    try {
+      ObjectMapper objectMapper = new ObjectMapper();
+      ControlFile controlFile =
+          objectMapper.readValue(new File(controlFilePath), ControlFile.class);
+      return Optional.of(controlFile);
+    } catch (IOException e) {
+      throw new ParameterException(
+          spec.commandLine(),
+          CoreError.DATA_LOADER_INVALID_CONTROL_FILE.buildMessage(controlFilePath));
+    }
+  }
+
+  /**
+   * Generate import options object from provided cli parameter data
+   *
+   * @param controlFile control file
+   * @return ImportOptions generated import options object
+   */
+  private ImportOptions createImportOptions(ControlFile controlFile) {
+    ImportOptions.ImportOptionsBuilder builder =
+        ImportOptions.builder()
+            .fileFormat(sourceFileFormat)
+            .requireAllColumns(requireAllColumns)
+            .prettyPrint(prettyPrint)
+            .controlFile(controlFile)
+            .controlFileValidationLevel(controlFileValidation)
+            .logRawRecord(logRawRecord)
+            .logSuccessRecords(logSuccessRecords)
+            .ignoreNullValues(ignoreNullValues)
+            .namespace(namespace)
+            .dataChunkSize(dataChunkSize)
+            .transactionBatchSize(transactionSize)
+            .maxThreads(maxThreads)
+            .dataChunkQueueSize(dataChunkQueueSize)
+            .tableName(tableName);
+
+    // Import mode
+    if (importMode != null) {
+      builder.importMode(importMode);
+    }
+    if (!splitLogMode) {
+      builder.logMode(LogMode.SINGLE_FILE);
+    }
+
+    // CSV options
+    if (sourceFileFormat.equals(FileFormat.CSV)) {
+      builder.delimiter(delimiter);
+      if (!StringUtils.isBlank(customHeaderRow)) {
+        builder.customHeaderRow(customHeaderRow);
+      }
+    }
+    return builder.build();
+  }
 }