move database migrations to schema

Author: danthe1st

src/main/java/net/discordjug/javabot/data/h2db/MigrationUtils.java

@@ -7,16 +7,32 @@
 import java.nio.file.*;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Objects;
 
+import lombok.extern.slf4j.Slf4j;
 import net.discordjug.javabot.data.h2db.commands.MigrationsListSubcommand;
 
 /**
  * Utility class that handles SQL Migrations.
  */
+@Slf4j
 public class MigrationUtils {
+	
+	private static final Path migrationDirectory;
 
 	private MigrationUtils() {
 	}
+	
+	static {
+		Path dir;
+		try {
+			dir = createMigrationsDirectory();
+		} catch (IOException | URISyntaxException e) {
+			log.error("Cannot create database migration directory", e);
+			dir = null;
+		}
+		migrationDirectory = dir;
+	}
 
 	/**
 	 * Tries to get the Migrations Directories' Path.
@@ -26,6 +42,10 @@ private MigrationUtils() {
 	 * @throws IOException        If an error occurs.
 	 */
 	public static Path getMigrationsDirectory() throws URISyntaxException, IOException {
+		return Objects.requireNonNull(migrationDirectory);
+	}
+	
+	private static Path createMigrationsDirectory() throws IOException, URISyntaxException {
 		URL resource = MigrationsListSubcommand.class.getResource("/database/migrations/");
 		if (resource == null) throw new IOException("Missing resource /migrations/");
 		URI uri = resource.toURI();

src/main/java/net/discordjug/javabot/data/h2db/commands/ExportTableSubcommand.java

@@ -52,7 +52,6 @@ public ExportTableSubcommand(ExecutorService asyncPool, SystemsConfig systemsCon
 								.addChoice("Message Cache", "MESSAGE_CACHE")
 								.addChoice("Question of the Week Accounts", "QOTW_POINTS")
 								.addChoice("Question of the Week Questions", "QOTW_QUESTION")
-								.addChoice("Reserved Help Channels", "RESERVED_HELP_CHANNELS")
 								.addChoice("Starboard", "STARBOARD")
 								.addChoice("Warns", "WARN")
 								.addChoice("User Preferences", "USER_PREFERENCES"),

src/main/java/net/discordjug/javabot/data/h2db/commands/MigrateSubcommand.java

@@ -93,7 +93,6 @@ public void execute(@NotNull SlashCommandInteractionEvent event) {
 				return;
 			}
 			String sql = Files.readString(migrationFile);
-			migrationsDir.getFileSystem().close();
 			String[] statements = sql.split("\\s*;\\s*");
 			if (statements.length == 0) {
 				Responses.error(event, "The migration `" + migrationName + "` does not contain any statements. Please remove or edit it before running again.").queue();