perf: harden quotas and reduce compression overhead

src/worker/mod.rs

@@ -569,14 +569,20 @@ async fn process_task_file(
     ctx: TaskContext,
     billing_ctx: Option<billing::BillingContext>,
 ) -> Result<(), AppError> {
-    if is_task_cancelled(&state, task_id).await? {
-        return Ok(());
-    }
-
     let updated = sqlx::query(
-        "UPDATE task_files SET status = 'processing' WHERE id = $1 AND status = 'pending'",
+        r#"
+        UPDATE task_files AS f
+        SET status = 'processing'
+        FROM tasks AS t
+        WHERE f.id = $1
+          AND f.task_id = t.id
+          AND t.id = $2
+          AND f.status = 'pending'
+          AND t.status IN ('pending', 'processing')
+        "#,
     )
     .bind(file.id)
+    .bind(task_id)
     .execute(&state.db)
     .await
     .map_err(|err| AppError::new(ErrorCode::Internal, "更新文件处理状态失败").with_source(err))?;
@@ -584,11 +590,6 @@ async fn process_task_file(
         return Ok(());
     }
 
-    if is_task_cancelled(&state, task_id).await? {
-        mark_file_failed(&state, task_id, file.id, "已取消").await?;
-        return Ok(());
-    }
-
     let Some(input_path) = file.input_path.clone() else {
         mark_file_failed(&state, task_id, file.id, "原文件不存在").await?;
         return Ok(());
@@ -702,13 +703,6 @@ async fn process_task_file(
         }
     }
 
-    if is_task_cancelled(&state, task_id).await? {
-        let _ = storage::delete_object(&state, &stored_locator(&stored)).await;
-        mark_file_failed(&state, task_id, file.id, "已取消").await?;
-        let _ = tokio::fs::remove_file(&input_path).await;
-        return Ok(());
-    }
-
     if let Err(err) = finalize_file(
         &state,
         &billing_ctx,
@@ -766,6 +760,9 @@ async fn finalize_file(
             .map_err(|err| {
                 AppError::new(ErrorCode::Internal, "锁定任务状态失败").with_source(err)
             })?;
+    if matches!(task_status.as_deref(), Some("cancelled")) {
+        return Err(AppError::new(ErrorCode::InvalidRequest, "已取消"));
+    }
     if !matches!(task_status.as_deref(), Some("pending" | "processing")) {
         return Err(AppError::new(ErrorCode::InvalidRequest, "任务已结束"));
     }