性能优化
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171
soul-api/internal/cache/cache.go
vendored
Normal file
171
soul-api/internal/cache/cache.go
vendored
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@@ -0,0 +1,171 @@
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package cache
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import (
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"context"
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"encoding/json"
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"fmt"
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"log"
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"time"
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"soul-api/internal/database"
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"soul-api/internal/model"
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"soul-api/internal/redis"
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)
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const defaultTimeout = 2 * time.Second
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// KeyBookParts 目录接口缓存 key,后台更新章节/内容时需 Del
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const KeyBookParts = "soul:book:parts"
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// KeyBookHot 热门章节,格式 soul:book:hot:{limit}
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func KeyBookHot(limit int) string { return "soul:book:hot:" + fmt.Sprint(limit) }
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const KeyBookRecommended = "soul:book:recommended"
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const KeyBookStats = "soul:book:stats"
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const KeyConfigMiniprogram = "soul:config:miniprogram"
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// Get 从 Redis 读取,未配置或失败返回 nil(调用方回退 DB)
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func Get(ctx context.Context, key string, dest interface{}) bool {
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client := redis.Client()
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if client == nil {
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return false
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}
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if ctx == nil {
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ctx = context.Background()
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}
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ctx, cancel := context.WithTimeout(ctx, defaultTimeout)
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defer cancel()
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val, err := client.Get(ctx, key).Bytes()
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if err != nil {
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return false
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}
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if dest != nil && len(val) > 0 {
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_ = json.Unmarshal(val, dest)
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}
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return true
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}
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// Set 写入 Redis,失败仅打日志不阻塞
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func Set(ctx context.Context, key string, val interface{}, ttl time.Duration) {
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client := redis.Client()
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if client == nil {
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return
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}
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if ctx == nil {
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ctx = context.Background()
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}
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ctx, cancel := context.WithTimeout(ctx, defaultTimeout)
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defer cancel()
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data, err := json.Marshal(val)
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if err != nil {
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log.Printf("cache.Set marshal %s: %v", key, err)
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return
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}
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if err := client.Set(ctx, key, data, ttl).Err(); err != nil {
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log.Printf("cache.Set %s: %v (非致命)", key, err)
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}
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}
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// Del 删除 key,失败仅打日志
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func Del(ctx context.Context, key string) {
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client := redis.Client()
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if client == nil {
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return
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}
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if ctx == nil {
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ctx = context.Background()
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}
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ctx, cancel := context.WithTimeout(ctx, defaultTimeout)
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defer cancel()
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if err := client.Del(ctx, key).Err(); err != nil {
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log.Printf("cache.Del %s: %v (非致命)", key, err)
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}
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}
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// BookPartsTTL 目录接口缓存 TTL,后台更新时主动 Del,此为兜底时长
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const BookPartsTTL = 10 * time.Minute
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// InvalidateBookParts 后台更新章节/内容时调用,使目录接口缓存失效
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func InvalidateBookParts() {
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Del(context.Background(), KeyBookParts)
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}
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// InvalidateBookCache 使热门、推荐、统计等书籍相关缓存失效(与 InvalidateBookParts 同时调用)
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func InvalidateBookCache() {
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ctx := context.Background()
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Del(ctx, KeyBookRecommended)
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Del(ctx, KeyBookStats)
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for _, limit := range []int{3, 10, 20, 50} {
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Del(ctx, KeyBookHot(limit))
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}
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}
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// InvalidateConfig 配置变更时调用,使小程序 config 缓存失效
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func InvalidateConfig() {
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Del(context.Background(), KeyConfigMiniprogram)
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}
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// BookRelatedTTL 书籍相关接口 TTL(hot/recommended/stats)
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const BookRelatedTTL = 5 * time.Minute
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// ConfigTTL 配置接口 TTL
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const ConfigTTL = 10 * time.Minute
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// KeyChapterContent 章节正文缓存,格式 soul:chapter:content:{mid},存原始 HTML 字符串
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func KeyChapterContent(mid int) string { return "soul:chapter:content:" + fmt.Sprint(mid) }
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// ChapterContentTTL 章节正文 TTL,后台更新时主动 Del
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const ChapterContentTTL = 30 * time.Minute
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// GetString 读取字符串(不经过 JSON,适合大文本 content)
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func GetString(ctx context.Context, key string) (string, bool) {
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client := redis.Client()
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if client == nil {
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return "", false
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}
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if ctx == nil {
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ctx = context.Background()
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}
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ctx, cancel := context.WithTimeout(ctx, defaultTimeout)
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defer cancel()
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val, err := client.Get(ctx, key).Result()
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if err != nil {
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return "", false
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}
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return val, true
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}
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// SetString 写入字符串(不经过 JSON,适合大文本 content)
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func SetString(ctx context.Context, key string, val string, ttl time.Duration) {
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client := redis.Client()
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if client == nil {
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return
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}
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if ctx == nil {
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ctx = context.Background()
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}
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ctx, cancel := context.WithTimeout(ctx, defaultTimeout)
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defer cancel()
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if err := client.Set(ctx, key, val, ttl).Err(); err != nil {
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log.Printf("cache.SetString %s: %v (非致命)", key, err)
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}
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}
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// InvalidateChapterContent 章节内容更新时调用,mid<=0 时忽略
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func InvalidateChapterContent(mid int) {
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if mid <= 0 {
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return
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}
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Del(context.Background(), KeyChapterContent(mid))
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}
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// InvalidateChapterContentByID 按业务 id 使章节内容缓存失效(内部查 mid 后调用 InvalidateChapterContent)
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func InvalidateChapterContentByID(id string) {
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if id == "" {
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return
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}
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var mid int
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if err := database.DB().Model(&model.Chapter{}).Where("id = ?", id).Pluck("mid", &mid).Error; err != nil || mid <= 0 {
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return
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}
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InvalidateChapterContent(mid)
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}
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