feat(file): unify file handling with a new FileSource abstraction for URL and base64 data

common/disk_cache.go

@@ -0,0 +1,172 @@
+package common
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// DiskCacheType 磁盘缓存类型
+type DiskCacheType string
+
+const (
+	DiskCacheTypeBody DiskCacheType = "body" // 请求体缓存
+	DiskCacheTypeFile DiskCacheType = "file" // 文件数据缓存
+)
+
+// 统一的缓存目录名
+const diskCacheDir = "new-api-body-cache"
+
+// GetDiskCacheDir 获取统一的磁盘缓存目录
+// 注意：每次调用都会重新计算，以响应配置变化
+func GetDiskCacheDir() string {
+	cachePath := GetDiskCachePath()
+	if cachePath == "" {
+		cachePath = os.TempDir()
+	}
+	return filepath.Join(cachePath, diskCacheDir)
+}
+
+// EnsureDiskCacheDir 确保缓存目录存在
+func EnsureDiskCacheDir() error {
+	dir := GetDiskCacheDir()
+	return os.MkdirAll(dir, 0755)
+}
+
+// CreateDiskCacheFile 创建磁盘缓存文件
+// cacheType: 缓存类型（body/file）
+// 返回文件路径和文件句柄
+func CreateDiskCacheFile(cacheType DiskCacheType) (string, *os.File, error) {
+	if err := EnsureDiskCacheDir(); err != nil {
+		return "", nil, fmt.Errorf("failed to create cache directory: %w", err)
+	}
+
+	dir := GetDiskCacheDir()
+	filename := fmt.Sprintf("%s-%s-%d.tmp", cacheType, uuid.New().String()[:8], time.Now().UnixNano())
+	filePath := filepath.Join(dir, filename)
+
+	file, err := os.OpenFile(filePath, os.O_CREATE|os.O_RDWR|os.O_EXCL, 0600)
+	if err != nil {
+		return "", nil, fmt.Errorf("failed to create cache file: %w", err)
+	}
+
+	return filePath, file, nil
+}
+
+// WriteDiskCacheFile 写入数据到磁盘缓存文件
+// 返回文件路径
+func WriteDiskCacheFile(cacheType DiskCacheType, data []byte) (string, error) {
+	filePath, file, err := CreateDiskCacheFile(cacheType)
+	if err != nil {
+		return "", err
+	}
+
+	_, err = file.Write(data)
+	if err != nil {
+		file.Close()
+		os.Remove(filePath)
+		return "", fmt.Errorf("failed to write cache file: %w", err)
+	}
+
+	if err := file.Close(); err != nil {
+		os.Remove(filePath)
+		return "", fmt.Errorf("failed to close cache file: %w", err)
+	}
+
+	return filePath, nil
+}
+
+// WriteDiskCacheFileString 写入字符串到磁盘缓存文件
+func WriteDiskCacheFileString(cacheType DiskCacheType, data string) (string, error) {
+	return WriteDiskCacheFile(cacheType, []byte(data))
+}
+
+// ReadDiskCacheFile 读取磁盘缓存文件
+func ReadDiskCacheFile(filePath string) ([]byte, error) {
+	return os.ReadFile(filePath)
+}
+
+// ReadDiskCacheFileString 读取磁盘缓存文件为字符串
+func ReadDiskCacheFileString(filePath string) (string, error) {
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+// RemoveDiskCacheFile 删除磁盘缓存文件
+func RemoveDiskCacheFile(filePath string) error {
+	return os.Remove(filePath)
+}
+
+// CleanupOldDiskCacheFiles 清理旧的缓存文件
+// maxAge: 文件最大存活时间
+// 注意：此函数只删除文件，不更新统计（因为无法知道每个文件的原始大小）
+func CleanupOldDiskCacheFiles(maxAge time.Duration) error {
+	dir := GetDiskCacheDir()
+
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil // 目录不存在，无需清理
+		}
+		return err
+	}
+
+	now := time.Now()
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		info, err := entry.Info()
+		if err != nil {
+			continue
+		}
+		if now.Sub(info.ModTime()) > maxAge {
+			os.Remove(filepath.Join(dir, entry.Name()))
+		}
+	}
+	return nil
+}
+
+// GetDiskCacheInfo 获取磁盘缓存目录信息
+func GetDiskCacheInfo() (fileCount int, totalSize int64, err error) {
+	dir := GetDiskCacheDir()
+
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return 0, 0, nil
+		}
+		return 0, 0, err
+	}
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		info, err := entry.Info()
+		if err != nil {
+			continue
+		}
+		fileCount++
+		totalSize += info.Size()
+	}
+	return fileCount, totalSize, nil
+}
+
+// ShouldUseDiskCache 判断是否应该使用磁盘缓存
+func ShouldUseDiskCache(dataSize int64) bool {
+	if !IsDiskCacheEnabled() {
+		return false
+	}
+	threshold := GetDiskCacheThresholdBytes()
+	if dataSize < threshold {
+		return false
+	}
+	return IsDiskCacheAvailable(dataSize)
+}