251 lines
7.1 KiB
Go
251 lines
7.1 KiB
Go
package database
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import (
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"context"
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"crypto/sha256"
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"encoding/json"
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"fmt"
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"time"
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"github.com/redis/go-redis/v9"
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)
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const (
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BlacklistKeyPrefix = "blacklist:token:"
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InspirationFlowKeyPrefix = "inspiration_flow:"
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)
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// RedisClient Redis 客户端单例
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var RedisClient *redis.Client
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// Config Redis 配置
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type RedisConfig struct {
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Host string
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Port int
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Password string
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DB int
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}
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// InitRedis 初始化 Redis 连接
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func InitRedis(cfg RedisConfig) error {
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RedisClient = redis.NewClient(&redis.Options{
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Addr: fmt.Sprintf("%s:%d", cfg.Host, cfg.Port),
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Password: cfg.Password,
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DB: cfg.DB,
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})
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := RedisClient.Ping(ctx).Err(); err != nil {
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return fmt.Errorf("failed to connect to redis: %w", err)
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}
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return nil
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}
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// CloseRedis 关闭 Redis 连接
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func CloseRedis() error {
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if RedisClient != nil {
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return RedisClient.Close()
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}
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return nil
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}
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// GetRedis 获取 Redis 客户端实例
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func GetRedis() *redis.Client {
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return RedisClient
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}
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// RedisHealthCheck 健康检查
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func RedisHealthCheck() error {
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if RedisClient == nil {
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return fmt.Errorf("redis client is not initialized")
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}
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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return RedisClient.Ping(ctx).Err()
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}
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// BlacklistEntry 黑名单条目
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type BlacklistEntry struct {
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UserID int64 `json:"user_id"`
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Reason string `json:"reason"`
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}
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// tokenToHash 将 Token 转换为 SHA256 哈希作为 Key
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func tokenToHash(token string) string {
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hash := sha256.Sum256([]byte(token))
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return fmt.Sprintf("%x", hash)
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}
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// AddToBlacklist 添加 Token 到黑名单
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func AddToBlacklist(ctx context.Context, token string, userID int64, banReason string, ttl time.Duration) error {
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if token == "" {
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return fmt.Errorf("token is empty")
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}
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if RedisClient == nil {
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return fmt.Errorf("redis client is not initialized")
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}
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key := BlacklistKeyPrefix + tokenToHash(token)
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entry := BlacklistEntry{UserID: userID, Reason: banReason}
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value, err := json.Marshal(entry)
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if err != nil {
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return fmt.Errorf("failed to marshal blacklist entry: %w", err)
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}
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return RedisClient.Set(ctx, key, value, ttl).Err()
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}
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// IsBlacklisted 检查 Token 是否在黑名单
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func IsBlacklisted(ctx context.Context, token string) (bool, int64, string, error) {
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if token == "" {
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return false, 0, "", nil
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}
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if RedisClient == nil {
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return false, 0, "", fmt.Errorf("redis client is not initialized")
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}
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key := BlacklistKeyPrefix + tokenToHash(token)
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value, err := RedisClient.Get(ctx, key).Result()
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if err == redis.Nil {
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return false, 0, "", nil
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}
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if err != nil {
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return false, 0, "", err
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}
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var entry BlacklistEntry
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if err := json.Unmarshal([]byte(value), &entry); err != nil {
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return false, 0, "", fmt.Errorf("failed to unmarshal blacklist entry: %w", err)
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}
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return true, entry.UserID, entry.Reason, nil
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}
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// RemoveFromBlacklist 从黑名单移除 Token（用于解封）
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func RemoveFromBlacklist(ctx context.Context, token string) error {
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if token == "" {
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return nil
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}
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if RedisClient == nil {
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return fmt.Errorf("redis client is not initialized")
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}
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key := BlacklistKeyPrefix + tokenToHash(token)
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return RedisClient.Del(ctx, key).Err()
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}
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// InspirationFlowCacheEntry 单个展品缓存数据
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type InspirationFlowCacheEntry struct {
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AssetID int64 `json:"asset_id"`
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Name string `json:"name"`
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CoverURL string `json:"cover_url"`
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LikeCount int32 `json:"like_count"`
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OwnerNickname string `json:"owner_nickname"`
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Span int32 `json:"span"`
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MaterialType string `json:"material_type"`
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}
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// InspirationFlowCache 会话缓存结构
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type InspirationFlowCache struct {
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DisplayedIDs []int64 `json:"displayed_ids"` // 已展示ID列表
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History map[int64]InspirationFlowCacheEntry `json:"history"` // 历史数据详情
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}
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// InspirationFlowKey 生成灵感瀑布流缓存 Key
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func InspirationFlowKey(starID int64, sessionID string) string {
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return fmt.Sprintf("%s%d:%s", InspirationFlowKeyPrefix, starID, sessionID)
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}
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// GetInspirationFlowCache 获取灵感瀑布流会话缓存
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func GetInspirationFlowCache(ctx context.Context, starID int64, sessionID string) (*InspirationFlowCache, error) {
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if RedisClient == nil {
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return nil, fmt.Errorf("redis client is not initialized")
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}
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key := InspirationFlowKey(starID, sessionID)
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data, err := RedisClient.Get(ctx, key).Result()
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if err == redis.Nil {
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return &InspirationFlowCache{
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DisplayedIDs: []int64{},
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History: make(map[int64]InspirationFlowCacheEntry),
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}, nil
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}
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if err != nil {
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return nil, err
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}
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var cache InspirationFlowCache
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if err := json.Unmarshal([]byte(data), &cache); err != nil {
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return nil, err
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}
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return &cache, nil
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}
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// SaveInspirationFlowCache 保存灵感瀑布流会话缓存
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func SaveInspirationFlowCache(ctx context.Context, starID int64, sessionID string, cache *InspirationFlowCache, ttl time.Duration) error {
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if RedisClient == nil {
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return fmt.Errorf("redis client is not initialized")
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}
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key := InspirationFlowKey(starID, sessionID)
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data, err := json.Marshal(cache)
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if err != nil {
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return err
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}
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return RedisClient.Set(ctx, key, data, ttl).Err()
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}
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// AddToInspirationFlowCache 添加展品到会话缓存
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func AddToInspirationFlowCache(ctx context.Context, starID int64, sessionID string, entry InspirationFlowCacheEntry, ttl time.Duration) error {
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cache, err := GetInspirationFlowCache(ctx, starID, sessionID)
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if err != nil {
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return err
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}
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// 检查是否已存在
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for _, id := range cache.DisplayedIDs {
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if id == entry.AssetID {
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return nil // 已存在，跳过
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}
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}
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// 添加到已展示列表
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cache.DisplayedIDs = append(cache.DisplayedIDs, entry.AssetID)
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// 添加到历史详情
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if cache.History == nil {
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cache.History = make(map[int64]InspirationFlowCacheEntry)
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}
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cache.History[entry.AssetID] = entry
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return SaveInspirationFlowCache(ctx, starID, sessionID, cache, ttl)
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}
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// GetHistoryPage 获取历史数据的某一页
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func GetHistoryPage(cache *InspirationFlowCache, offset, limit int) []InspirationFlowCacheEntry {
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if cache == nil || cache.History == nil {
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return []InspirationFlowCacheEntry{}
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}
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// 按展示顺序反向遍历（最新展示的在前面）
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items := make([]InspirationFlowCacheEntry, 0)
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for i := len(cache.DisplayedIDs) - 1; i >= 0; i-- {
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if entry, ok := cache.History[cache.DisplayedIDs[i]]; ok {
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items = append(items, entry)
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}
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}
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// 分页
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start := offset
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end := offset + limit
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if start >= len(items) {
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return []InspirationFlowCacheEntry{}
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}
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if end > len(items) {
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end = len(items)
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}
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return items[start:end]
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} |