From ae1934f7dbc3c721321918793143e05ed0410e16 Mon Sep 17 00:00:00 2001
From: shaw <shaw-wei@foxmail.com>
Date: Thu, 5 Feb 2026 22:36:17 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E4=BF=AE=E5=A4=8D=E7=AE=A1=E7=90=86?=
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问题原因：Redis Pipeline 执行 Lua 脚本时出现 NOSCRIPT 错误，
因为 redis.NewScript 使用 EVALSHA 执行脚本，当 Redis 重启或
脚本未被缓存时，Pipeline 模式无法自动回退到 EVAL。

解决方案：在 NewSessionLimitCache 初始化时预加载所有 Lua 脚本
到 Redis，确保后续 Pipeline 执行时脚本已被缓存。
---
 .../internal/repository/session_limit_cache.go   | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/backend/internal/repository/session_limit_cache.go b/backend/internal/repository/session_limit_cache.go
index 3dc89f87..3d57b152 100644
--- a/backend/internal/repository/session_limit_cache.go
+++ b/backend/internal/repository/session_limit_cache.go
@@ -3,6 +3,7 @@ package repository
 import (
 	"context"
 	"fmt"
+	"log"
 	"strconv"
 	"time"
 
@@ -153,6 +154,21 @@ func NewSessionLimitCache(rdb *redis.Client, defaultIdleTimeoutMinutes int) serv
 	if defaultIdleTimeoutMinutes <= 0 {
 		defaultIdleTimeoutMinutes = 5 // 默认 5 分钟
 	}
+
+	// 预加载 Lua 脚本到 Redis，避免 Pipeline 中出现 NOSCRIPT 错误
+	ctx := context.Background()
+	scripts := []*redis.Script{
+		registerSessionScript,
+		refreshSessionScript,
+		getActiveSessionCountScript,
+		isSessionActiveScript,
+	}
+	for _, script := range scripts {
+		if err := script.Load(ctx, rdb).Err(); err != nil {
+			log.Printf("[SessionLimitCache] Failed to preload Lua script: %v", err)
+		}
+	}
+
 	return &sessionLimitCache{
 		rdb:                rdb,
 		defaultIdleTimeout: time.Duration(defaultIdleTimeoutMinutes) * time.Minute,