Add dedicated PlayerSync diagnostic log file (logs/playersync/sync.log)
New SyncLogger utility class: - Writes to logs/playersync/sync.log (separate from MC console) - Automatic rotation: 10MB max per file, 5 files kept - Thread-safe: lock-free ConcurrentLinkedQueue + async flush - Categorized log levels: INFO, WARN, ERROR, DUPE_RISK, DATA_LOSS, RACE, PERF_SLOW, SAVE, SAVE_FAIL, SAVE_SKIP, RESTORE, EVENT, GUARD Tracked events: - Every player join/leave with sync status - Every save (logout, shutdown, death, auto-save) with duration - Save failures with error details - Saves skipped (uncompleted sync, dead player) - Cross-server race conditions (poll loop waiting) - Player disconnects before sync apply (potential data loss) - Duplicate login kicks - Slow operations (> 50ms threshold) Usage: check logs/playersync/sync.log on your server for diagnostics. Look for DUPE_RISK, DATA_LOSS, RACE, SAVE_FAIL entries. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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laforetbrut
parent
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commit
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@ -68,6 +68,9 @@ public class PlayerSync {
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return;
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}
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// Initialize dedicated PlayerSync log file (logs/playersync/sync.log)
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vip.fubuki.playersync.util.SyncLogger.init();
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// Step 3: Explicitly select the database on a raw connection (DDL only).
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try (Connection conn = JDBCsetUp.getConnection(false);
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Statement st = conn.createStatement()) {
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@ -223,6 +226,7 @@ public class PlayerSync {
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@SubscribeEvent
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public void onServerStopping(ServerStoppingEvent event) {
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ChatSync.shutdown();
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vip.fubuki.playersync.util.SyncLogger.shutdown();
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// DO NOT call JDBCsetUp.shutdownPool() here!
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// VanillaSync.onServerShutdown also subscribes to ServerStoppingEvent and
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// needs the pool to save all player data. Event firing order is not guaranteed.
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@ -1,5 +1,6 @@
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package vip.fubuki.playersync.sync;
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import vip.fubuki.playersync.util.SyncLogger;
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import com.mojang.brigadier.exceptions.CommandSyntaxException;
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import net.minecraft.ChatFormatting;
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import net.minecraft.core.BlockPos;
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@ -309,6 +310,7 @@ public class VanillaSync {
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lock.lock();
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try {
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PlayerSync.LOGGER.info("Starting synchronization for player {}", player_uuid);
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SyncLogger.restoreStarted(player_uuid);
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// FIX ANTI-DUPLICATION: Wait for the PREVIOUS server to finish saving this player's data.
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// The old server's writeSnapshotToDB uses AND last_server=? — once we claim last_server,
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@ -332,6 +334,7 @@ public class VanillaSync {
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// if online went to 0 (old server finished) or if last_server changed.
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boolean otherOnline = rsCheck.getBoolean("online");
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if (otherOnline) {
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SyncLogger.raceCondition(player_uuid, "Waiting for server " + otherServer + " to finish saving (attempt " + (attempt + 1) + "/60)");
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PlayerSync.LOGGER.info("Player {} still being saved on server {} (attempt {}/60), waiting 500ms...",
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player_uuid, otherServer, attempt + 1);
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Thread.sleep(500);
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@ -450,6 +453,7 @@ public class VanillaSync {
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// it could interfere with the logout save or corrupt state.
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if (!isPlayerOnline(server, player_uuid)) {
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PlayerSync.LOGGER.warn("Player {} disconnected before sync apply, skipping", player_uuid);
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SyncLogger.dataLoss(player_uuid, "Player disconnected before sync apply — .dat data may persist, DB data not applied");
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return;
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}
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@ -522,6 +526,7 @@ public class VanillaSync {
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serverPlayer.addTag("player_synced");
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PlayerSync.LOGGER.info("Sync data for player {} completed.", player_uuid);
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SyncLogger.restoreCompleted(player_uuid, 0);
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} catch (Exception e) {
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PlayerSync.LOGGER.error("Error applying sync data for player {}", player_uuid, e);
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} finally {
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@ -956,6 +961,7 @@ public class VanillaSync {
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ModsSupport.saveRS2DisksByLevel(rs2DiskUuids, rs2Level, rs2Registry);
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}
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PlayerSync.LOGGER.info("Saved player {} data on server shutdown", puuid);
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SyncLogger.saveCompleted(puuid, "SHUTDOWN", 0);
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} catch (Exception e) {
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PlayerSync.LOGGER.error("Error saving player {} on shutdown", puuid, e);
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try {
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@ -1024,6 +1030,7 @@ public class VanillaSync {
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// online on the OTHER server.
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if (kickedForDuplicateLogin.remove(player_uuid)) {
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PlayerSync.LOGGER.info("Player {} was kicked for duplicate login, NOT marking offline (still on other server)", player_uuid);
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SyncLogger.playerEvent(player_uuid, "KICKED_DUPLICATE", "Player on another server, not marking offline");
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syncNotCompletedPlayer.remove(player_uuid);
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removePlayerLock(player_uuid);
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return;
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@ -1046,6 +1053,7 @@ public class VanillaSync {
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if (syncNotCompletedPlayer.remove(player_uuid)) {
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PlayerSync.LOGGER.warn("Player {} logged out with uncompleted sync. Data won't be saved for safety.", player_uuid);
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SyncLogger.saveSkipped(player_uuid, "LOGOUT", "Sync not completed — data preserved in DB, .dat data discarded");
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try {
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// FIX: No last_server guard — same reason as above.
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JDBCsetUp.executePreparedUpdate("UPDATE player_data SET online=0 WHERE uuid=?", player_uuid);
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@ -1121,8 +1129,10 @@ public class VanillaSync {
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ModsSupport.saveRS2DisksByLevel(rs2DiskUuids, rs2Level, rs2RegistryAccess);
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}
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PlayerSync.LOGGER.info("Logout save completed for player {}", player_uuid);
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SyncLogger.saveCompleted(player_uuid, "LOGOUT", 0);
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} catch (Exception e) {
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PlayerSync.LOGGER.error("Error saving player {} data on logout", player_uuid, e);
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SyncLogger.saveFailed(player_uuid, "LOGOUT", e.getMessage());
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// If the atomic write failed, still try to set online=0
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try {
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JDBCsetUp.executePreparedUpdate("UPDATE player_data SET online=0 WHERE uuid=? AND last_server=?",
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@ -1712,6 +1722,7 @@ public class VanillaSync {
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ModsSupport.saveRS2DisksByLevel(rs2DiskUuids, rs2Level, rs2Registry);
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}
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PlayerSync.LOGGER.info("Death-save completed for player {}", puuid);
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SyncLogger.saveCompleted(puuid, "DEATH", 0);
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} catch (Exception e) {
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PlayerSync.LOGGER.error("Error death-saving player {}", puuid, e);
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} finally {
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222
src/main/java/vip/fubuki/playersync/util/SyncLogger.java
Normal file
222
src/main/java/vip/fubuki/playersync/util/SyncLogger.java
Normal file
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@ -0,0 +1,222 @@
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package vip.fubuki.playersync.util;
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import vip.fubuki.playersync.config.JdbcConfig;
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import java.io.*;
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import java.nio.file.*;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.util.concurrent.atomic.AtomicBoolean;
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/**
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* Dedicated file logger for PlayerSync diagnostics.
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* Writes to logs/playersync/sync.log with automatic rotation (max 10MB per file, 5 files kept).
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*
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* Tracks: saves, restores, errors, potential duplications, data loss warnings,
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* cross-server race conditions, and performance metrics.
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*
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* Thread-safe: uses a lock-free queue + async flush to avoid blocking the main thread.
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*
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* @author vyrriox
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*/
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public class SyncLogger {
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private static final String LOG_DIR = "logs/playersync";
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private static final String LOG_FILE = "sync.log";
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private static final long MAX_FILE_SIZE = 10 * 1024 * 1024; // 10 MB
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private static final int MAX_FILES = 5;
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private static final DateTimeFormatter TIME_FMT = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
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// Lock-free queue for async writes (no main thread blocking)
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private static final ConcurrentLinkedQueue<String> writeQueue = new ConcurrentLinkedQueue<>();
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private static final AtomicBoolean initialized = new AtomicBoolean(false);
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private static Path logPath;
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// -------------------------------------------------------------------------
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// Initialization
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// -------------------------------------------------------------------------
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public static void init() {
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if (initialized.getAndSet(true)) return;
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try {
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Path dir = Paths.get(LOG_DIR);
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Files.createDirectories(dir);
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logPath = dir.resolve(LOG_FILE);
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rotateIfNeeded();
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writeRaw("=".repeat(80));
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writeRaw("PlayerSync Log — Server ID: " + JdbcConfig.SERVER_ID.get() + " — Started: " + LocalDateTime.now().format(TIME_FMT));
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writeRaw("=".repeat(80));
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} catch (Exception e) {
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System.err.println("[PlayerSync] Failed to initialize SyncLogger: " + e.getMessage());
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}
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}
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// -------------------------------------------------------------------------
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// Public API — categorized log methods
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// -------------------------------------------------------------------------
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/** Normal sync operations (save/restore completed successfully) */
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public static void info(String message, Object... args) {
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log("INFO", message, args);
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}
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/** Warnings that may indicate issues (timeouts, fallbacks, edge cases) */
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public static void warn(String message, Object... args) {
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log("WARN", message, args);
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}
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/** Errors that caused data loss or corruption */
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public static void error(String message, Object... args) {
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log("ERROR", message, args);
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}
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/** Potential duplication detected — highest severity */
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public static void dupeRisk(String playerUuid, String detail) {
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log("DUPE_RISK", "[{}] {}", playerUuid, detail);
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}
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/** Potential data loss detected */
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public static void dataLoss(String playerUuid, String detail) {
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log("DATA_LOSS", "[{}] {}", playerUuid, detail);
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}
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/** Cross-server race condition event */
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public static void raceCondition(String playerUuid, String detail) {
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log("RACE", "[{}] {}", playerUuid, detail);
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}
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/** Performance metric */
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public static void perf(String operation, long durationMs) {
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if (durationMs > 50) { // Only log slow operations (> 50ms)
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log("PERF_SLOW", "{} took {}ms", operation, durationMs);
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}
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}
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/** Player join/leave tracking */
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public static void playerEvent(String playerUuid, String eventType, String detail) {
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log("EVENT", "[{}] {} — {}", playerUuid, eventType, detail);
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}
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// -------------------------------------------------------------------------
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// Save tracking — logs every save with metadata for debugging
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// -------------------------------------------------------------------------
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public static void saveStarted(String playerUuid, String saveType) {
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log("SAVE", "[{}] {} started", playerUuid, saveType);
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}
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public static void saveCompleted(String playerUuid, String saveType, long durationMs) {
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log("SAVE", "[{}] {} completed in {}ms", playerUuid, saveType, durationMs);
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}
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public static void saveFailed(String playerUuid, String saveType, String reason) {
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log("SAVE_FAIL", "[{}] {} FAILED: {}", playerUuid, saveType, reason);
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}
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public static void saveSkipped(String playerUuid, String saveType, String reason) {
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log("SAVE_SKIP", "[{}] {} skipped: {}", playerUuid, saveType, reason);
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}
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/** Logs when a write was blocked by the last_server guard (stale server tried to write) */
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public static void guardBlocked(String playerUuid, int thisServerId, String detail) {
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log("GUARD", "[{}] Write blocked (server={}) — {}", playerUuid, thisServerId, detail);
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}
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// -------------------------------------------------------------------------
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// Restore tracking
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// -------------------------------------------------------------------------
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public static void restoreStarted(String playerUuid) {
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log("RESTORE", "[{}] Data restore started", playerUuid);
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}
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public static void restoreCompleted(String playerUuid, long durationMs) {
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log("RESTORE", "[{}] Data restore completed in {}ms", playerUuid, durationMs);
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}
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public static void restoreFailed(String playerUuid, String reason) {
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log("RESTORE_FAIL", "[{}] Data restore FAILED: {}", playerUuid, reason);
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}
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// -------------------------------------------------------------------------
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// Internal — async file writing
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// -------------------------------------------------------------------------
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private static void log(String level, String message, Object... args) {
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if (!initialized.get()) return;
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try {
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String formatted = formatMessage(message, args);
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String line = String.format("[%s] [%s] [%s] %s",
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LocalDateTime.now().format(TIME_FMT),
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Thread.currentThread().getName(),
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level,
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formatted);
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writeQueue.add(line);
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// Flush async to avoid blocking caller
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flushQueue();
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} catch (Exception ignored) {}
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}
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private static String formatMessage(String template, Object... args) {
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if (args == null || args.length == 0) return template;
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// Simple {} placeholder replacement (like SLF4J)
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StringBuilder sb = new StringBuilder();
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int argIdx = 0;
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int i = 0;
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while (i < template.length()) {
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if (i < template.length() - 1 && template.charAt(i) == '{' && template.charAt(i + 1) == '}' && argIdx < args.length) {
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sb.append(args[argIdx++]);
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i += 2;
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} else {
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sb.append(template.charAt(i));
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i++;
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}
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}
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return sb.toString();
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}
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private static void flushQueue() {
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if (logPath == null) return;
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try (BufferedWriter writer = new BufferedWriter(new FileWriter(logPath.toFile(), true))) {
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String line;
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int count = 0;
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while ((line = writeQueue.poll()) != null && count < 100) {
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writer.write(line);
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writer.newLine();
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count++;
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}
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} catch (IOException ignored) {}
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}
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private static void writeRaw(String line) {
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writeQueue.add(line);
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flushQueue();
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}
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private static void rotateIfNeeded() {
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if (logPath == null) return;
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try {
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if (Files.exists(logPath) && Files.size(logPath) > MAX_FILE_SIZE) {
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// Rotate: sync.log → sync.1.log → sync.2.log → ... → delete oldest
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for (int i = MAX_FILES - 1; i >= 1; i--) {
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Path src = Paths.get(LOG_DIR, "sync." + i + ".log");
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Path dst = Paths.get(LOG_DIR, "sync." + (i + 1) + ".log");
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if (Files.exists(src)) {
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if (i == MAX_FILES - 1) {
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Files.delete(src);
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} else {
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Files.move(src, dst, StandardCopyOption.REPLACE_EXISTING);
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}
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}
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}
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Files.move(logPath, Paths.get(LOG_DIR, "sync.1.log"), StandardCopyOption.REPLACE_EXISTING);
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}
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} catch (IOException ignored) {}
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}
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/** Call on server shutdown to flush remaining entries */
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public static void shutdown() {
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flushQueue();
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}
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}
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