[WIP] Maintenance mode can be enabled through socket calls and client/server communication works fine.

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

src/main/java/xyz/vallat/louis/MoviesQuoteBot.java

@@ -22,7 +22,7 @@ public class MoviesQuoteBot {
     public static final String DESCRIPTION = "I may know quotes from movies.";
     public static final String VERSION = "0.3.8-SNAPSHOT";
     public static final String KILL_SWITCH_FILE = "system_locked";
-    public static final String MAINTENANCE_MODE_FILE = "maintenance_mode_engaged";
+    public static final String MAINTENANCE_MODE_FILE = "maintenance_mode_locked";
     private static final Logger logger = LoggerFactory.getLogger(MoviesQuoteBot.class.getCanonicalName());
     private static final Options options = new Options();
     private static boolean isInMaintenanceMode = false;
@@ -52,27 +52,31 @@ public class MoviesQuoteBot {
             DiscordManager.logout();
         }));
 
-        DiscordManager.onDisconnect();
-
         if (new File(MAINTENANCE_MODE_FILE).exists()) {
             logger.warn("Starting in maintenance mode.");
             switchToMaintenanceMode();
         }
+
+        DiscordManager.onDisconnect();
     }
 
     public static void switchToMaintenanceMode() {
+        if (!isInMaintenanceMode) {
             try {
                 if (new File(MAINTENANCE_MODE_FILE).createNewFile())
                     logger.debug("Created file '{}'.", MAINTENANCE_MODE_FILE);
             } catch (IOException e) {
                 logger.error("Couldn't create file '{}'.", MAINTENANCE_MODE_FILE);
             }
+            isInMaintenanceMode = true;
             DiscordManager.setOnMaintenanceMode();
             OpenSubtitles.logout();
             logger.info("Maintenance mode engaged.");
         }
+    }
 
     public static void switchToNormalOperations() {
+        if (isInMaintenanceMode) {
             try {
                 Files.delete(Path.of(MAINTENANCE_MODE_FILE));
             } catch (IOException e) {
@@ -83,9 +87,9 @@ public class MoviesQuoteBot {
             OpenSubtitles.login();
             logger.info("Maintenance mode disengaged.");
         }
+    }
 
     public static boolean isInMaintenanceMode() {
-        if (!Files.exists(Path.of(MAINTENANCE_MODE_FILE)) && isInMaintenanceMode) switchToNormalOperations();
         return isInMaintenanceMode;
     }
 
@@ -93,5 +97,6 @@ public class MoviesQuoteBot {
         CommandsClient.checkVersions();
         CommandsClient.setMaintenanceMode(true);
         CommandsClient.setMaintenanceMode(false);
+        System.exit(0);
     }
 }

src/main/java/xyz/vallat/louis/discord/DiscordManager.java

@@ -47,9 +47,9 @@ public final class DiscordManager {
     private static void registerDiscordCommands() {
         for (Command command : commands)
             discordClient.getEventDispatcher().on(MessageCreateEvent.class)
-                    .filter(event -> !isInMaintenanceMode() && event.getMessage().getAuthor().map(user -> !user.isBot()).orElse(false))
+                    .filter(event -> event.getMessage().getAuthor().map(user -> !user.isBot()).orElse(false))
                     .filter(event -> event.getMessage().getContent().split(" ")[0].equals(command.getName()))
-                    .flatMap(event -> command.execute(event).then())
+                    .flatMap(event -> !isInMaintenanceMode() ? command.execute(event).then() : Mono.just("").then())
                     .subscribe();
     }
 

src/main/java/xyz/vallat/louis/sockets/CommandsClient.java

@@ -20,6 +20,8 @@ public class CommandsClient {
     private static final String SOCKET_HOST = System.getenv(EnvironmentVariables.SOCKET_HOST.getValue()) == null ?
             "localhost" : System.getenv(EnvironmentVariables.SOCKET_HOST.getValue());
 
+    private CommandsClient() {}
+
     private static String sendMessage(String message) {
         logger.debug("Sending message '{}'.", message);
         try (Socket clientSocket = new Socket(SOCKET_HOST, PORT)) {

src/main/java/xyz/vallat/louis/sockets/CommandsServer.java

@@ -57,7 +57,7 @@ public class CommandsServer {
                 logger.error("Couldn't even create kill switch file... Exiting anyway.", e);
             }
             System.exit(ExitCodes.URGENT_EXIT_REQUIRED.getValue());
-        });
+        }).start();
     }
 
     private static boolean computeMessage(PrintWriter out, String message) {

src/main/java/xyz/vallat/louis/subtitles/OpenSubtitles.java

@@ -50,7 +50,7 @@ public final class OpenSubtitles {
 
     public static void logout() {
         try {
-            client.logout();
+            if (client.isLoggedIn()) client.logout();
         } catch (XmlRpcException e) {
             logger.error("Could not log out. Skipping.");
         }