v0.4.29: delete promoted cache file on first epoch-mismatch in publishIfNotCancelled

If wipeOnShutdown runs between download's pre-move epoch check and the
atomic Files.move, the wipe's directory scan misses the just-promoted
final file. The first epoch-mismatch branch in publishIfNotCancelled was
returning without deleting, leaking the file across sessions. Delete on
the first branch too.

gradle.properties

@@ -5,7 +5,7 @@ org.gradle.configuration-cache=false
 
 # Mod
 mod_id=video_player
-mod_version=0.4.27
+mod_version=0.4.29
 maven_group=com.ejclaw.videoplayer
 archives_base_name=video_player
 

src/main/java/com/ejclaw/videoplayer/VideoPlayerClient.java

@@ -3,6 +3,7 @@ package com.ejclaw.videoplayer;
 import com.ejclaw.videoplayer.block.VideoAnchorBlockEntity;
 import com.ejclaw.videoplayer.client.MusicQuizClient;
 import com.ejclaw.videoplayer.client.net.ClientNetworking;
+import com.ejclaw.videoplayer.client.playback.VideoCache;
 import com.ejclaw.videoplayer.client.playback.VideoPlayback;
 import com.ejclaw.videoplayer.client.render.VideoAnchorRenderer;
 import com.ejclaw.videoplayer.item.VideoStickItem;
@@ -12,6 +13,7 @@ import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientBlockEntityEvents;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
 import net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking;
 import net.fabricmc.fabric.api.client.rendering.v1.BlockEntityRendererRegistry;
@@ -82,6 +84,11 @@ public class VideoPlayerClient implements ClientModInitializer {
             }
         });
 
+        // Wipe video_player_cache/ on game exit so preloaded clips don't pile up across
+        // sessions. Cache entries are re-broadcast by the server on every JOIN, so a freshly
+        // started game will repopulate the cache automatically.
+        ClientLifecycleEvents.CLIENT_STOPPING.register(client -> VideoCache.wipeOnShutdown());
+
         VideoPlayerMod.LOG.info("[{}] client initialized", VideoPlayerMod.MOD_ID);
     }
 

src/main/java/com/ejclaw/videoplayer/client/playback/VideoCache.java

@@ -226,6 +226,40 @@ public final class VideoCache {
         IN_FLIGHT.clear();
     }
 
+    /**
+     * Wipe the cache directory at game shutdown so the user doesn't accumulate disk usage
+     * across sessions. Distinct from {@link #clearAll()}: at shutdown there are no concurrent
+     * downloads to race and no player to chat-notify, so we skip the chat ping but still bump
+     * the epoch (defensive — any straggler write inside the in-flight {@code .part} stream
+     * will detect the bump and self-clean) and drop indexes.
+     */
+    public static void wipeOnShutdown() {
+        CACHE_EPOCH.incrementAndGet();
+        READY.clear();
+        IN_FLIGHT.clear();
+        int deleted = 0;
+        int failed  = 0;
+        try {
+            Path dir = cacheDir();
+            if (dir != null && Files.isDirectory(dir)) {
+                try (var stream = Files.newDirectoryStream(dir)) {
+                    for (Path p : stream) {
+                        try {
+                            if (Files.isRegularFile(p) && Files.deleteIfExists(p)) deleted++;
+                        } catch (Throwable t) {
+                            failed++;
+                        }
+                    }
+                }
+            }
+        } catch (Throwable t) {
+            VideoPlayerMod.LOG.warn("[{}] wipeOnShutdown failed: {}",
+                VideoPlayerMod.MOD_ID, t.toString());
+        }
+        VideoPlayerMod.LOG.info("[{}] wipeOnShutdown: deleted={} failed={}",
+            VideoPlayerMod.MOD_ID, deleted, failed);
+    }
+
     /** Caller-supplied: current set of URLs that are fully cached, for diagnostics. */
     public static Set<String> readyUrls() {
         return new HashSet<>(READY.keySet());
@@ -250,7 +284,13 @@ public final class VideoCache {
      *         caller's work was cancelled and {@code path} has been cleaned up.
      */
     private static boolean publishIfNotCancelled(String url, Path path, long startEpoch) {
-        if (CACHE_EPOCH.get() != startEpoch) return false;
+        // If the wipe ran between download's pre-move epoch check and Files.move, its
+        // directory scan won't have seen this just-promoted file. We must delete it here,
+        // not just bail — otherwise the freshly-moved final file leaks across shutdown.
+        if (CACHE_EPOCH.get() != startEpoch) {
+            try { Files.deleteIfExists(path); } catch (Throwable ignored) {}
+            return false;
+        }
         READY.put(url, path);
         if (CACHE_EPOCH.get() != startEpoch) {
             READY.remove(url, path);