feat(storage): implement provider caching and error logging in asset builder

internal/builders/asset_builder.go

@@ -3,6 +3,8 @@ package builders
 import (
 	"cs-agent/internal/models"
 	"cs-agent/internal/pkg/dto/response"
+	"cs-agent/internal/services/storage"
+	"log/slog"
 )
 
 func BuildAsset(item *models.Asset) response.AssetResponse {
@@ -23,5 +25,12 @@ func BuildAsset(item *models.Asset) response.AssetResponse {
 		UpdateUserID:   item.UpdateUserID,
 		UpdateUserName: item.UpdateUserName,
 	}
+
+	if provider, err := storage.GetProvider(item.Provider); err != nil {
+		slog.Error("get storage provider failed", "provider", item.Provider, "error", err)
+	} else {
+		ret.URL = provider.GetSignedURL(item.StorageKey)
+	}
+
 	return ret
 }

internal/services/storage/provider.go

@@ -7,6 +7,8 @@ import (
 	"io"
 )
 
+var providers = make(map[enums.AssetProvider]FileStorageProvider)
+
 type FileStorageProvider interface {
 	ProviderType() enums.AssetProvider
 	Upload(reader io.Reader, key string, info UploadInfo) (*StoredFile, error)
@@ -20,6 +22,20 @@ func GetDefault() (FileStorageProvider, error) {
 	return NewProvider(config.Current().Storage.Default)
 }
 
+func GetProvider(providerType enums.AssetProvider) (FileStorageProvider, error) {
+	if provider, exists := providers[providerType]; exists {
+		return provider, nil
+	}
+	provider, err := NewProvider(providerType)
+	if err != nil {
+		return nil, err
+	}
+
+	providers[providerType] = provider
+
+	return provider, nil
+}
+
 func NewProvider(provider enums.AssetProvider) (FileStorageProvider, error) {
 	cfg := config.Current().Storage