114 lines
3.1 KiB
Go
114 lines
3.1 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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"fmt"
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"time"
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)
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// AudioCacheItem 音频缓存项
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type AudioCacheItem struct {
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OriginalURL string `json:"original_url"` // 原始CDN URL
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DeviceID string `json:"device_id"` // 关联的设备ID
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Headers map[string]string `json:"headers"` // 请求头信息
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CachedAt time.Time `json:"cached_at"` // 缓存时间
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}
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// GenerateAudioProxyURL 生成音频代理URL
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func GenerateAudioProxyURL(originalURL, deviceID string, headers map[string]string) string {
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// 生成缓存key
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key := generateRandomKey(16)
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// 将headers序列化为JSON字符串
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headersJSON, _ := json.Marshal(headers)
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// 存储到数据库
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if cacheDB != nil {
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cacheMutex.Lock()
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defer cacheMutex.Unlock()
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_, err := cacheDB.Exec(`
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INSERT INTO audio_cache (key, original_url, device_id, headers, created_at)
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VALUES (?, ?, ?, ?, ?)
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`, key, originalURL, deviceID, string(headersJSON), time.Now().Unix())
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if err != nil {
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audioLogger.Error("保存音频缓存失败: " + err.Error())
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}
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}
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// 返回代理URL
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return fmt.Sprintf("/audio/proxy/%s", key)
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}
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// HandleAudioProxy 处理音频代理请求
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func HandleAudioProxy(key string) ([]byte, string, 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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// 从数据库获取音频信息
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var originalURL, deviceID, headersJSON string
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var createdAt int64
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cacheMutex.Lock()
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err := cacheDB.QueryRow(`
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SELECT original_url, device_id, headers, created_at
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FROM audio_cache WHERE key = ?
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`, key).Scan(&originalURL, &deviceID, &headersJSON, &createdAt)
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cacheMutex.Unlock()
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if err == sql.ErrNoRows {
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return nil, "", fmt.Errorf("音频信息不存在，请先调用 /audio 接口")
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}
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if err != nil {
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return nil, "", fmt.Errorf("查询音频缓存失败: %w", err)
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}
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// 检查缓存是否过期（2小时，匹配CDN链接有效期）
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if time.Now().Unix()-createdAt > 7200 { // 2小时 = 7200秒
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// 清理过期缓存
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cacheMutex.Lock()
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cacheDB.Exec("DELETE FROM audio_cache WHERE key = ?", key)
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cacheMutex.Unlock()
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return nil, "", fmt.Errorf("音频信息已过期，请重新调用 /audio 接口")
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}
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// 解析headers
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var headers map[string]string
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json.Unmarshal([]byte(headersJSON), &headers)
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if headers == nil {
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headers = make(map[string]string)
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}
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// 下载音频内容，使用关联的设备信息
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data, contentType, err := downloadMediaWithRetry(originalURL, deviceID, headers, 3)
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if err != nil {
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return nil, "", fmt.Errorf("下载音频失败: %w", err)
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}
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return data, contentType, nil
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}
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// CleanExpiredAudioCache 清理过期的音频缓存
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func CleanExpiredAudioCache() {
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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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// 删除2小时前的缓存
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result, err := cacheDB.Exec("DELETE FROM audio_cache WHERE created_at < ?", time.Now().Unix()-7200)
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if err != nil {
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audioLogger.Error("清理过期音频缓存失败: " + err.Error())
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return
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}
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rowsAffected, _ := result.RowsAffected()
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if rowsAffected > 0 {
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audioLogger.Info(fmt.Sprintf("已清理 %d 条过期音频缓存", rowsAffected))
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}
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}
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