fix(media): 清理旧 rendition 并确保失败状态落库

fruitshorts-module-media/src/main/java/com/fruitshorts/media/service/ThumbnailRecordService.java

@@ -27,18 +27,12 @@ public class ThumbnailRecordService {
         if (episodeId == null || episodeId <= 0) {
             return;
         }
-        MediaThumbnail existing = mediaThumbnailMapper.selectOne(
-                Wrappers.<MediaThumbnail>lambdaQuery()
-                        .eq(MediaThumbnail::getEpisodeId, episodeId)
-                        .last("limit 1"));
         thumbnail.setDramaId(task.getDramaId() == null ? 0L : task.getDramaId());
         thumbnail.setEpisodeId(episodeId);
         thumbnail.setErrorMsg(TranscodeErrorTruncator.truncate(thumbnail.getErrorMsg()));
-        if (existing == null) {
-            mediaThumbnailMapper.insert(thumbnail);
-            return;
-        }
-        thumbnail.setId(existing.getId());
-        mediaThumbnailMapper.updateById(thumbnail);
+        thumbnail.setId(null);
+        mediaThumbnailMapper.delete(Wrappers.<MediaThumbnail>lambdaQuery()
+                .eq(MediaThumbnail::getEpisodeId, episodeId));
+        mediaThumbnailMapper.insert(thumbnail);
     }
 }

fruitshorts-module-media/src/main/java/com/fruitshorts/media/service/TranscodeErrorTruncator.java

@@ -7,7 +7,7 @@ public final class TranscodeErrorTruncator {
 
     public static final int MAX_ERROR_CHARS = 500;
     private static final String EMPTY = "";
-    private static final String TRUNCATED_TEMPLATE = "…(truncated, total=%d chars)";
+    private static final String TRUNCATED_TEMPLATE = "…(truncated, total=%d chars)…";
 
     private TranscodeErrorTruncator() {
     }
@@ -17,7 +17,10 @@ public final class TranscodeErrorTruncator {
             return message == null ? EMPTY : message;
         }
         String suffix = String.format(TRUNCATED_TEMPLATE, message.length());
-        int prefixLength = Math.max(0, MAX_ERROR_CHARS - suffix.length());
-        return message.substring(0, prefixLength) + suffix;
+        int remain = Math.max(0, MAX_ERROR_CHARS - suffix.length());
+        int prefixLength = remain / 2;
+        int tailLength = remain - prefixLength;
+        return message.substring(0, prefixLength)
+                + suffix + message.substring(message.length() - tailLength);
     }
 }

fruitshorts-module-media/src/main/java/com/fruitshorts/media/service/TranscodeService.java

@@ -217,8 +217,15 @@ public class TranscodeService {
     public void succeed(Long taskId, List<MediaRendition> renditions,
                         MediaThumbnail thumbnail) {
         TranscodeTask task = getExisting(taskId);
-        mediaRenditionMapper.delete(Wrappers.<MediaRendition>lambdaQuery()
-                .eq(MediaRendition::getMediaAssetId, task.getMediaAssetId()));
+        var renditionDelete = Wrappers.<MediaRendition>lambdaQuery();
+        if (task.getEpisodeId() != null && task.getEpisodeId() > 0) {
+            renditionDelete.and(wrapper -> wrapper
+                    .eq(MediaRendition::getMediaAssetId, task.getMediaAssetId())
+                    .or().eq(MediaRendition::getEpisodeId, task.getEpisodeId()));
+        } else {
+            renditionDelete.eq(MediaRendition::getMediaAssetId, task.getMediaAssetId());
+        }
+        mediaRenditionMapper.delete(renditionDelete);
         for (MediaRendition rendition : renditions) {
             rendition.setMediaAssetId(task.getMediaAssetId());
             rendition.setDramaId(task.getDramaId());
@@ -277,6 +284,23 @@ public class TranscodeService {
                 .set(TranscodeTask::getProgress, safeProgress));
     }
 
+    /** 主流程异常时立即终止任务，保留最后进度并写入截断后的错误。 */
+    public int failFinal(Long taskId, String errorMessage) {
+        if (taskId == null) {
+            return 0;
+        }
+        int updated = transcodeTaskMapper.update(null, Wrappers.<TranscodeTask>lambdaUpdate()
+                .eq(TranscodeTask::getId, taskId)
+                .set(TranscodeTask::getStatus, STATUS_FAILED)
+                .set(TranscodeTask::getErrorMsg,
+                        TranscodeErrorTruncator.truncate(errorMessage))
+                .set(TranscodeTask::getFinishedAt, LocalDateTime.now()));
+        if (updated == 0) {
+            log.error("转码任务失败状态落库失败：task={} 不存在或未更新", taskId);
+        }
+        return updated;
+    }
+
     /** RUNNING 超过阈值且 updated_at 长期未变时自动收口，避免僵尸任务永久占位。 */
     public int recoverStaleRunningTasks() {
         LocalDateTime now = LocalDateTime.now();

fruitshorts-module-media/src/main/java/com/fruitshorts/media/service/transcode/TranscodeWorker.java

@@ -116,15 +116,23 @@ public class TranscodeWorker {
             logThumbnailResult(result.thumbnail());
         } catch (Exception ex) {
             String reason = ex.getMessage() == null ? ex.getClass().getSimpleName() : ex.getMessage();
-            int attempt = (task.getRetryCount() == null ? 0 : task.getRetryCount()) + 1;
-            String status = transcodeService.fail(task.getId(), reason);
-            if (TranscodeService.STATUS_FAILED.equals(status)
-                    && task.getMediaAssetId() != null && task.getMediaAssetId() > 0) {
-                mediaService.markFailed(task.getMediaAssetId(), reason);
+            try {
+                transcodeService.failFinal(task.getId(), reason);
+            } catch (Exception persistError) {
+                log.error("转码任务失败状态落库失败 task={} 原因={}",
+                        task.getId(), persistError.getMessage(), persistError);
             }
-            log.error("转码失败 task={} 第 {}/{} 次尝试 耗时={}ms 结果={} 原因={}",
-                    task.getId(), attempt, TranscodeService.MAX_RETRY, System.currentTimeMillis() - startedAt,
-                    status, reason);
+            if (task.getMediaAssetId() != null && task.getMediaAssetId() > 0) {
+                try {
+                    mediaService.markFailed(task.getMediaAssetId(), reason);
+                } catch (Exception mediaError) {
+                    log.error("媒资失败状态落库失败 asset={} 原因={}",
+                            task.getMediaAssetId(), mediaError.getMessage(), mediaError);
+                }
+            }
+            log.error("转码失败 task={} 耗时={}ms 结果=FAILED 原因={}",
+                    task.getId(), System.currentTimeMillis() - startedAt,
+                    TranscodeErrorTruncator.truncate(reason));
         }
     }