Improve database error messages

- Don't log "database is closed" when query tries to execute after database close
- Log better error help when mysql fails to connect

Affects issues:
- Fixed #2499

Plan/bukkit/src/main/java/com/djrapitops/plan/storage/database/BukkitDBSystem.java

@@ -32,7 +32,6 @@ import javax.inject.Singleton;
 @Singleton
 public class BukkitDBSystem extends DBSystem {
 
-    private final PlanConfig config;
 
     @Inject
     public BukkitDBSystem(
@@ -42,8 +41,7 @@ public class BukkitDBSystem extends DBSystem {
             PlanConfig config,
             PluginLogger logger
     ) {
-        super(locale, sqLiteDB, logger);
-        this.config = config;
+        super(config, locale, sqLiteDB, logger);
 
         databases.add(mySQLDB);
         databases.add(sqLiteDB.usingDefaultFile());

Plan/common/src/main/java/com/djrapitops/plan/exceptions/database/DBClosedException.java

@@ -0,0 +1,29 @@
+/*
+ *  This file is part of Player Analytics (Plan).
+ *
+ *  Plan is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License v3 as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Plan is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with Plan. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.djrapitops.plan.exceptions.database;
+
+/**
+ * Database is closed and exception is needed to stop execution, not to be logged.
+ *
+ * @author AuroraLS3
+ */
+public class DBClosedException extends DBOpException {
+
+    public DBClosedException(String message) {
+        super(message);
+    }
+}

Plan/common/src/main/java/com/djrapitops/plan/settings/config/PlanConfig.java

@@ -98,7 +98,7 @@ public class PlanConfig extends Config {
     }
 
     public boolean isTrue(Setting<Boolean> setting) {
-        return get(setting);
+        return Boolean.TRUE.equals(get(setting));
     }
 
     public boolean isFalse(Setting<Boolean> setting) {

Plan/common/src/main/java/com/djrapitops/plan/storage/database/DBAccessLock.java

@@ -16,7 +16,7 @@
  */
 package com.djrapitops.plan.storage.database;
 
-import com.djrapitops.plan.exceptions.EnableException;
+import com.djrapitops.plan.exceptions.database.DBClosedException;
 import com.djrapitops.plan.storage.database.transactions.Transaction;
 import com.djrapitops.plan.storage.database.transactions.init.OperationCriticalTransaction;
 
@@ -58,7 +58,7 @@ public class DBAccessLock {
                 synchronized (lockObject) {
                     lockObject.wait();
                     if (database.getState() == Database.State.CLOSED) {
-                        throw new EnableException("Database failed to open, Query has failed. (This exception is necessary to not keep query threads waiting)");
+                        throw new DBClosedException("Database failed to open, Query has failed. (This exception is necessary to not keep query threads waiting)");
                     }
                 }
             }

Plan/common/src/main/java/com/djrapitops/plan/storage/database/DBSystem.java

@@ -19,13 +19,21 @@ package com.djrapitops.plan.storage.database;
 import com.djrapitops.plan.SubSystem;
 import com.djrapitops.plan.exceptions.EnableException;
 import com.djrapitops.plan.exceptions.database.DBInitException;
+import com.djrapitops.plan.settings.config.PlanConfig;
+import com.djrapitops.plan.settings.config.paths.DatabaseSettings;
 import com.djrapitops.plan.settings.locale.Locale;
 import com.djrapitops.plan.settings.locale.lang.PluginLang;
 import net.playeranalytics.plugin.server.PluginLogger;
+import org.jetbrains.annotations.NotNull;
 
 import javax.inject.Singleton;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Paths;
 import java.util.HashSet;
 import java.util.Set;
+import java.util.stream.Stream;
 
 /**
  * System that holds the active databases.
@@ -35,6 +43,7 @@ import java.util.Set;
 @Singleton
 public class DBSystem implements SubSystem {
 
+    protected final PlanConfig config;
     protected final Locale locale;
     private final SQLiteDB.Factory sqLiteFactory;
     protected final PluginLogger logger;
@@ -43,10 +52,12 @@ public class DBSystem implements SubSystem {
     protected final Set<Database> databases;
 
     public DBSystem(
+            PlanConfig config,
             Locale locale,
             SQLiteDB.Factory sqLiteDB,
             PluginLogger logger
     ) {
+        this.config = config;
         this.locale = locale;
         this.sqLiteFactory = sqLiteDB;
         this.logger = logger;
@@ -94,7 +105,30 @@ public class DBSystem implements SubSystem {
         } catch (DBInitException e) {
             Throwable cause = e.getCause();
             String message = cause == null ? e.getMessage() : cause.getMessage();
-            throw new EnableException(db.getType().getName() + " init failure: " + message, cause);
+            if (message.contains("The driver has not received any packets from the server.")) {
+                throw new EnableException(getMySQLConnectionFailureMessage());
+            } else {
+                throw new EnableException("Failed to start " + db.getType().getName() + ": " + message, cause);
+            }
+        }
+    }
+
+    @NotNull
+    private String getMySQLConnectionFailureMessage() {
+        return "Failed to start " + db.getType().getName() + ": Communications link failure. Plan could not connect to MySQL-" +
+                "\n- Check that database address '" + config.get(DatabaseSettings.MYSQL_HOST) + ":" + config.get(DatabaseSettings.MYSQL_PORT) + "' accessible." +
+                "\n- Check that database called '" + config.get(DatabaseSettings.MYSQL_DATABASE) + "' exists inside MySQL." +
+                "\n- Check that MySQL user '" + config.get(DatabaseSettings.MYSQL_USER) + "' has privileges to access the database." +
+                "\n- Check that other MySQL settings in Plan config correct." +
+                (isInsideDocker() ? "\n- Check that your docker container networking is set up correctly https://pterodactyl.io/tutorials/mysql_setup.html (Since your server is running inside a docker)" : "") +
+                "\n  More help: https://github.com/plan-player-analytics/Plan/wiki/Bungee-Set-Up#step-2-create-a-mysql-database-for-plan";
+    }
+
+    private boolean isInsideDocker() {
+        try (Stream<String> stream = Files.lines(Paths.get("/proc/1/cgroup"))) {
+            return stream.anyMatch(line -> line.contains("/docker"));
+        } catch (IOException | InvalidPathException | SecurityException e) {
+            return false;
         }
     }
 

Plan/common/src/main/java/com/djrapitops/plan/storage/database/ProxyDBSystem.java

@@ -16,6 +16,7 @@
  */
 package com.djrapitops.plan.storage.database;
 
+import com.djrapitops.plan.settings.config.PlanConfig;
 import com.djrapitops.plan.settings.locale.Locale;
 import net.playeranalytics.plugin.server.PluginLogger;
 
@@ -32,12 +33,13 @@ public class ProxyDBSystem extends DBSystem {
 
     @Inject
     public ProxyDBSystem(
+            PlanConfig config,
             Locale locale,
             MySQLDB mySQLDB,
             SQLiteDB.Factory sqLiteDB,
             PluginLogger logger
     ) {
-        super(locale, sqLiteDB, logger);
+        super(config, locale, sqLiteDB, logger);
         databases.add(mySQLDB);
         db = mySQLDB;
     }

Plan/common/src/main/java/com/djrapitops/plan/utilities/logging/PluginErrorLogger.java

@@ -19,6 +19,7 @@ package com.djrapitops.plan.utilities.logging;
 import com.djrapitops.plan.PlanPlugin;
 import com.djrapitops.plan.delivery.formatting.Formatters;
 import com.djrapitops.plan.exceptions.ExceptionWithContext;
+import com.djrapitops.plan.exceptions.database.DBClosedException;
 import com.djrapitops.plan.identification.properties.ServerProperties;
 import com.djrapitops.plan.storage.file.PlanFiles;
 import com.djrapitops.plan.utilities.java.Lists;
@@ -92,6 +93,10 @@ public class PluginErrorLogger implements ErrorLogger {
     }
 
     private void log(Consumer<String> logMethod, Throwable throwable, ErrorContext context) {
+        if (isExceptionThatShouldNotBeLogged(throwable)) {
+            return;
+        }
+
         String errorName = throwable.getClass().getSimpleName();
         String hash = hash(throwable);
         Path logsDir = files.getLogsDirectory();
@@ -105,6 +110,10 @@ public class PluginErrorLogger implements ErrorLogger {
         }
     }
 
+    private boolean isExceptionThatShouldNotBeLogged(Throwable throwable) {
+        return throwable instanceof DBClosedException || (throwable.getCause() != null && isExceptionThatShouldNotBeLogged(throwable.getCause()));
+    }
+
     private void logToFile(Path errorLog, Throwable throwable, ErrorContext context, String hash) {
         if (Files.exists(errorLog)) {
             logExisting(errorLog, throwable, context, hash);

Plan/common/src/test/java/utilities/dagger/DBSystemModule.java

@@ -16,7 +16,6 @@
  */
 package utilities.dagger;
 
-import com.djrapitops.plan.exceptions.EnableException;
 import com.djrapitops.plan.settings.config.PlanConfig;
 import com.djrapitops.plan.settings.config.paths.DatabaseSettings;
 import com.djrapitops.plan.settings.locale.Locale;
@@ -40,9 +39,9 @@ public class DBSystemModule {
             MySQLDB mySQLDB,
             PluginLogger logger
     ) {
-        return new DBSystem(locale, sqLiteDB, logger) {
+        return new DBSystem(config, locale, sqLiteDB, logger) {
             @Override
-            public void enable() throws EnableException {
+            public void enable() {
                 databases.add(sqLiteDB.usingDefaultFile());
                 databases.add(mySQLDB);
                 String dbType = config.get(DatabaseSettings.TYPE).toLowerCase().trim();

Plan/fabric/src/main/java/net/playeranalytics/plan/storage/database/FabricDBSystem.java

@@ -36,8 +36,6 @@ import javax.inject.Singleton;
 @Singleton
 public class FabricDBSystem extends DBSystem {
 
-    private final PlanConfig config;
-
     @Inject
     public FabricDBSystem(
             Locale locale,
@@ -46,8 +44,7 @@ public class FabricDBSystem extends DBSystem {
             PlanConfig config,
             PluginLogger logger
     ) {
-        super(locale, sqLiteDB, logger);
-        this.config = config;
+        super(config, locale, sqLiteDB, logger);
 
         databases.add(mySQLDB);
         databases.add(sqLiteDB.usingDefaultFile());

Plan/nukkit/src/main/java/com/djrapitops/plan/storage/database/NukkitDBSystem.java

@@ -32,8 +32,6 @@ import javax.inject.Singleton;
 @Singleton
 public class NukkitDBSystem extends DBSystem {
 
-    private final PlanConfig config;
-
     @Inject
     public NukkitDBSystem(
             Locale locale,
@@ -42,8 +40,7 @@ public class NukkitDBSystem extends DBSystem {
             PlanConfig config,
             PluginLogger logger
     ) {
-        super(locale, sqLiteDB, logger);
-        this.config = config;
+        super(config, locale, sqLiteDB, logger);
 
         databases.add(mySQLDB);
         databases.add(sqLiteDB.usingDefaultFile());

Plan/sponge/src/main/java/com/djrapitops/plan/storage/database/SpongeDBSystem.java

@@ -32,7 +32,6 @@ import javax.inject.Singleton;
 @Singleton
 public class SpongeDBSystem extends DBSystem {
 
-    private final PlanConfig config;
 
     @Inject
     public SpongeDBSystem(
@@ -42,8 +41,7 @@ public class SpongeDBSystem extends DBSystem {
             PlanConfig config,
             PluginLogger logger
     ) {
-        super(locale, sqLiteDB, logger);
-        this.config = config;
+        super(config, locale, sqLiteDB, logger);
 
         databases.add(mySQLDB);
         databases.add(sqLiteDB.usingDefaultFile());