528 lines
13 KiB
Go
528 lines
13 KiB
Go
package fqapi
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import (
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"database/sql"
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"encoding/json"
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"fanqie/internal/common"
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"fanqie/internal/config"
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"fmt"
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"sync"
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"time"
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_ "github.com/mattn/go-sqlite3"
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)
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var (
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cacheDB *sql.DB
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cacheMutex sync.Mutex
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cacheLogger = common.NewLogger("cache_manager", "INFO", "")
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contentRequestCount int // content接口访问计数
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countMutex sync.Mutex
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cacheCleanupTicker *time.Ticker // 缓存清理定时器
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)
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// CacheData 缓存数据结构
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type CacheData struct {
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Data string `json:"data"`
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Expi float64 `json:"expi"`
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}
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// InitDB 初始化数据库
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func InitDB() error {
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if cacheDB != nil {
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return nil // 已初始化
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}
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// 使用配置的路径
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dbPath := "./cache.db"
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cfg := config.GetConfig()
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if cfg != nil && cfg.Cache.SQLitePath != "" {
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dbPath = cfg.Cache.SQLitePath
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}
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var err error
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cacheDB, err = sql.Open("sqlite3", dbPath)
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if err != nil {
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cacheLogger.Error("打开数据库失败: " + err.Error())
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return err
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}
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// 创建缓存表（添加created_at字段用于清理）
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_, err = cacheDB.Exec(`CREATE TABLE IF NOT EXISTS cache (
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key TEXT PRIMARY KEY,
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value TEXT,
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created_at INTEGER DEFAULT (strftime('%s', 'now'))
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)`)
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if err != nil {
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cacheLogger.Error("创建缓存表失败: " + err.Error())
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return err
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}
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// 创建statistics表（保存请求统计，始终使用）
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_, err = cacheDB.Exec(`CREATE TABLE IF NOT EXISTS statistics (
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id INTEGER PRIMARY KEY CHECK (id = 1),
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total_requests INTEGER DEFAULT 0,
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search_requests INTEGER DEFAULT 0,
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detail_requests INTEGER DEFAULT 0,
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catalog_requests INTEGER DEFAULT 0,
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content_requests INTEGER DEFAULT 0,
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manga_requests INTEGER DEFAULT 0,
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audio_requests INTEGER DEFAULT 0,
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video_requests INTEGER DEFAULT 0,
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category_requests INTEGER DEFAULT 0,
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updated_at INTEGER DEFAULT (strftime('%s', 'now'))
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)`)
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if err != nil {
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cacheLogger.Error("创建statistics表失败: " + err.Error())
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return err
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}
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// 初始化statistics表（如果不存在记录）
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_, err = cacheDB.Exec(`INSERT OR IGNORE INTO statistics (id) VALUES (1)`)
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if err != nil {
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cacheLogger.Error("初始化statistics表失败: " + err.Error())
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}
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// 创建索引以提高清理效率
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_, err = cacheDB.Exec(`CREATE INDEX IF NOT EXISTS idx_created_at ON cache(created_at)`)
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if err != nil {
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cacheLogger.Error("创建索引失败: " + err.Error())
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}
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// 创建device_pool表（设备密钥池）
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_, err = cacheDB.Exec(`CREATE TABLE IF NOT EXISTS device_pool (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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device_header TEXT NOT NULL,
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key TEXT NOT NULL,
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key_ver INTEGER NOT NULL,
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is_valid INTEGER DEFAULT 1,
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created_at INTEGER NOT NULL,
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last_used_at INTEGER NOT NULL
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)`)
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if err != nil {
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cacheLogger.Error("创建device_pool表失败: " + err.Error())
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return err
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}
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// 创建device_pool索引
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_, err = cacheDB.Exec(`CREATE INDEX IF NOT EXISTS idx_device_pool_valid ON device_pool(is_valid)`)
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if err != nil {
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cacheLogger.Warning("创建device_pool索引失败: " + err.Error())
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}
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// 创建audio_cache表（音频代理缓存）
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_, err = cacheDB.Exec(`CREATE TABLE IF NOT EXISTS audio_cache (
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key TEXT PRIMARY KEY,
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original_url TEXT NOT NULL,
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device_id TEXT NOT NULL,
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headers TEXT,
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created_at INTEGER DEFAULT (strftime('%s', 'now'))
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)`)
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if err != nil {
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cacheLogger.Error("创建audio_cache表失败: " + err.Error())
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return err
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}
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return nil
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}
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// isCacheEnabled 检查正文内容缓存是否启用
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func isCacheEnabled() bool {
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cfg := config.GetConfig()
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if cfg == nil {
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return false
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}
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return cfg.Cache.Enabled
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}
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// GetCache 获取正文内容缓存
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func GetCache(key string) string {
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if !isCacheEnabled() {
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return ""
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}
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if cacheDB == nil {
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return ""
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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var value string
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err := cacheDB.QueryRow("SELECT value FROM cache WHERE key = ?", key).Scan(&value)
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if err != nil {
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if err != sql.ErrNoRows {
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cacheLogger.Error("查询缓存失败: " + err.Error())
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}
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return ""
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}
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var cacheData CacheData
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err = json.Unmarshal([]byte(value), &cacheData)
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if err != nil {
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cacheLogger.Error("解析缓存数据失败: " + err.Error())
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return ""
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}
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cacheLogger.Debug("缓存命中: " + key)
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// 检查是否过期
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if time.Now().Unix() < int64(cacheData.Expi) {
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cacheLogger.Debug("缓存有效！")
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return cacheData.Data
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}
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cacheLogger.Debug("缓存已过期！")
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return ""
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}
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// UpdateCache 更新缓存
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// UpdateCache 更新或插入正文内容缓存
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func UpdateCache(key string, value string, expi int) error {
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if !isCacheEnabled() {
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return nil
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}
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if cacheDB == nil {
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return nil
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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cacheData := CacheData{
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Data: value,
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Expi: float64(time.Now().Unix() + int64(expi)),
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}
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jsonData, err := json.Marshal(cacheData)
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if err != nil {
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return err
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}
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// 检查是否存在
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var exists bool
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err = cacheDB.QueryRow("SELECT 1 FROM cache WHERE key = ?", key).Scan(&exists)
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if err == sql.ErrNoRows {
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// 不存在，插入
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_, err = cacheDB.Exec("INSERT INTO cache (key, value) VALUES (?, ?)", key, string(jsonData))
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} else {
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// 存在，更新
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_, err = cacheDB.Exec("UPDATE cache SET value = ? WHERE key = ?", string(jsonData), key)
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}
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if err != nil {
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cacheLogger.Error("更新缓存失败: " + err.Error())
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return err
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}
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cacheLogger.Debug("缓存已更新: " + key)
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return nil
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}
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// CloseCache 关闭缓存数据库
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func CloseCache() {
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if cacheDB != nil {
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cacheDB.Close()
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}
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}
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// CleanupAllCache 立即清理所有正文缓存
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func CleanupAllCache() error {
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if cacheDB == nil {
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return fmt.Errorf("数据库未初始化")
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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// 删除所有缓存数据
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_, err := cacheDB.Exec("DELETE FROM cache")
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if err != nil {
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return err
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}
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// 智能压缩：仅在空闲空间超过阈值时执行
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var freelistCount int64
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err = cacheDB.QueryRow("PRAGMA freelist_count").Scan(&freelistCount)
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if err == nil && freelistCount > 0 {
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var pageSize int64
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err = cacheDB.QueryRow("PRAGMA page_size").Scan(&pageSize)
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if err == nil {
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freeBytes := freelistCount * pageSize
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// 阈值：空闲空间超过 5MB 时才执行压缩
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const vacuumThreshold = 5 * 1024 * 1024 // 5MB
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if freeBytes >= vacuumThreshold {
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cacheLogger.Info(fmt.Sprintf("空闲空间 %.2f MB，开始执行压缩...", float64(freeBytes)/(1024*1024)))
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_, err = cacheDB.Exec("VACUUM")
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if err != nil {
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cacheLogger.Warning("数据库压缩失败: " + err.Error())
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} else {
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cacheLogger.Info(fmt.Sprintf("数据库压缩完成，已释放 %.2f MB 磁盘空间", float64(freeBytes)/(1024*1024)))
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}
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} else {
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cacheLogger.Debug(fmt.Sprintf("空闲空间仅 %.2f MB，跳过压缩", float64(freeBytes)/(1024*1024)))
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}
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}
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}
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return nil
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}
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// CleanupExpiredCache 清理过期的正文缓存
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func CleanupExpiredCache() error {
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cfg := config.GetConfig()
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if cfg == nil {
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return fmt.Errorf("配置未加载")
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}
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// 检查是否启用清理
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if !cfg.Cache.CleanupEnabled {
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return nil
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}
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// 检查清理时间配置
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if cfg.Cache.CleanupSeconds <= 0 {
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return nil
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}
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if cacheDB == nil {
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return fmt.Errorf("数据库未初始化")
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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// 计算过期时间点（当前时间 - cleanup_seconds）
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expiredTime := time.Now().Unix() - int64(cfg.Cache.CleanupSeconds)
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// 删除过期的缓存（created_at < expiredTime）
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result, err := cacheDB.Exec("DELETE FROM cache WHERE created_at < ?", expiredTime)
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if err != nil {
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cacheLogger.Error("清理过期缓存失败: " + err.Error())
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return err
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}
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// 获取删除的行数
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rowsAffected, err := result.RowsAffected()
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if err != nil {
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cacheLogger.Warning("获取删除行数失败: " + err.Error())
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} else if rowsAffected > 0 {
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cacheLogger.Info(fmt.Sprintf("已清理 %d 条过期缓存（创建时间早于 %d 秒前）", rowsAffected, cfg.Cache.CleanupSeconds))
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}
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return nil
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}
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// StartCacheCleanup 启动缓存自动清理任务
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func StartCacheCleanup() {
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cfg := config.GetConfig()
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if cfg == nil || !cfg.Cache.CleanupEnabled || cfg.Cache.CleanupSeconds <= 0 {
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cacheLogger.Info("缓存自动清理未启用或配置无效，跳过启动")
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return
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}
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// 每小时执行一次清理（可以根据需要调整间隔）
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cleanupInterval := 1 * time.Hour
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cacheCleanupTicker = time.NewTicker(cleanupInterval)
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cacheLogger.Info(fmt.Sprintf("缓存自动清理已启动，清理间隔: %v，过期时间: %d 秒", cleanupInterval, cfg.Cache.CleanupSeconds))
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// 立即执行一次清理
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go func() {
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if err := CleanupExpiredCache(); err != nil {
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cacheLogger.Error("初始清理失败: " + err.Error())
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}
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}()
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// 定时执行清理
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go func() {
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for range cacheCleanupTicker.C {
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if err := CleanupExpiredCache(); err != nil {
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cacheLogger.Error("定时清理失败: " + err.Error())
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}
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}
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}()
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}
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// StopCacheCleanup 停止缓存自动清理任务
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func StopCacheCleanup() {
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if cacheCleanupTicker != nil {
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cacheCleanupTicker.Stop()
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cacheLogger.Info("缓存自动清理已停止")
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// 最后执行一次清理
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if err := CleanupExpiredCache(); err != nil {
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cacheLogger.Error("最后清理失败: " + err.Error())
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}
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}
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}
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// IncrementContentRequestCount 增加content接口访问计数
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func IncrementContentRequestCount() int {
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countMutex.Lock()
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defer countMutex.Unlock()
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contentRequestCount++
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return contentRequestCount
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}
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// ResetContentRequestCount 重置访问计数
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func ResetContentRequestCount() {
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countMutex.Lock()
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defer countMutex.Unlock()
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contentRequestCount = 0
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}
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// GetContentRequestCount 获取当前访问计数
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func GetContentRequestCount() int {
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countMutex.Lock()
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defer countMutex.Unlock()
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return contentRequestCount
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}
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// VacuumDatabase 压缩数据库，释放磁盘空间
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func VacuumDatabase() error {
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if cacheDB == nil {
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return fmt.Errorf("数据库未初始化")
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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cacheLogger.Info("开始执行数据库压缩...")
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_, err := cacheDB.Exec("VACUUM")
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if err != nil {
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cacheLogger.Error("数据库压缩失败: " + err.Error())
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return err
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}
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cacheLogger.Info("数据库压缩完成，磁盘空间已释放")
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return nil
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}
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// GetDatabaseStats 获取数据库统计信息
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func GetDatabaseStats() (map[string]interface{}, error) {
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if cacheDB == nil {
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return nil, fmt.Errorf("数据库未初始化")
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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stats := make(map[string]interface{})
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// 获取cache表记录数
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var cacheCount int
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err := cacheDB.QueryRow("SELECT COUNT(*) FROM cache").Scan(&cacheCount)
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if err != nil {
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cacheLogger.Warning("获取cache表记录数失败: " + err.Error())
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cacheCount = 0
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}
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stats["cache_count"] = cacheCount
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// 获取数据库页面统计
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var pageCount, pageSize, freelistCount int64
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err = cacheDB.QueryRow("PRAGMA page_count").Scan(&pageCount)
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if err == nil {
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stats["page_count"] = pageCount
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}
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err = cacheDB.QueryRow("PRAGMA page_size").Scan(&pageSize)
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if err == nil {
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stats["page_size"] = pageSize
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}
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err = cacheDB.QueryRow("PRAGMA freelist_count").Scan(&freelistCount)
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if err == nil {
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stats["freelist_count"] = freelistCount
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stats["total_size_bytes"] = pageCount * pageSize
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stats["free_size_bytes"] = freelistCount * pageSize
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stats["used_size_bytes"] = (pageCount - freelistCount) * pageSize
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}
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return stats, nil
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}
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// SaveStatistics 保存请求统计到数据库
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func SaveStatistics(stats map[string]int64) error {
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if cacheDB == nil {
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return fmt.Errorf("数据库未初始化")
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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_, err := cacheDB.Exec(`
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UPDATE statistics
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SET total_requests = ?,
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search_requests = ?,
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detail_requests = ?,
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catalog_requests = ?,
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content_requests = ?,
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manga_requests = ?,
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audio_requests = ?,
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video_requests = ?,
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category_requests = ?,
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updated_at = strftime('%s', 'now')
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WHERE id = 1
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`, stats["total"], stats["search"], stats["detail"], stats["catalog"],
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stats["content"], stats["manga"], stats["audio"], stats["video"], stats["category"])
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if err != nil {
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cacheLogger.Error("保存统计数据失败: " + err.Error())
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return err
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}
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return nil
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}
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// LoadStatistics 从数据库加载请求统计
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func LoadStatistics() (map[string]int64, error) {
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if cacheDB == nil {
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return nil, fmt.Errorf("数据库未初始化")
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}
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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var total, search, detail, catalog, content, manga, audio, video, category int64
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err := cacheDB.QueryRow(`
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SELECT total_requests, search_requests, detail_requests, catalog_requests,
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content_requests, manga_requests, audio_requests, video_requests, category_requests
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FROM statistics WHERE id = 1
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`).Scan(&total, &search, &detail, &catalog, &content, &manga, &audio, &video, &category)
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if err == sql.ErrNoRows {
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// 没有数据，返回空统计
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return map[string]int64{
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"total": 0, "search": 0, "detail": 0, "catalog": 0,
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"content": 0, "manga": 0, "audio": 0, "video": 0, "category": 0,
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}, nil
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}
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if err != nil {
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cacheLogger.Error("加载统计数据失败: " + err.Error())
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return nil, err
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}
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stats := map[string]int64{
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"total": total,
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"search": search,
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"detail": detail,
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"catalog": catalog,
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"content": content,
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"manga": manga,
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"audio": audio,
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"video": video,
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"category": category,
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}
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return stats, nil
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} |