Parallelise Bulk Import. (#6267)

* Parallelise Bulk Import.

* Set worker count through command line flag.

cmd/platform/import.go

@@ -35,6 +35,7 @@ var bulkImportCmd = &cobra.Command{
 func init() {
 	bulkImportCmd.Flags().Bool("apply", false, "Save the import data to the database. Use with caution - this cannot be reverted.")
 	bulkImportCmd.Flags().Bool("validate", false, "Validate the import data without making any changes to the system.")
+	bulkImportCmd.Flags().Int("workers", 2, "How many workers to run whilst doing the import.")
 
 	importCmd.AddCommand(
 		bulkImportCmd,
@@ -87,6 +88,11 @@ func bulkImportCmdF(cmd *cobra.Command, args []string) error {
 		return errors.New("Validate flag error")
 	}
 
+	workers, err := cmd.Flags().GetInt("workers")
+	if err != nil {
+		return errors.New("Workers flag error")
+	}
+
 	if len(args) != 1 {
 		return errors.New("Incorrect number of arguments.")
 	}
@@ -110,7 +116,7 @@ func bulkImportCmdF(cmd *cobra.Command, args []string) error {
 
 	CommandPrettyPrintln("")
 
-	if err, lineNumber := app.BulkImport(fileReader, !apply); err != nil {
+	if err, lineNumber := app.BulkImport(fileReader, !apply, workers); err != nil {
 		CommandPrettyPrintln(err.Error())
 		if lineNumber != 0 {
 			CommandPrettyPrintln(fmt.Sprintf("Error occurred on data file line %v", lineNumber))