ac660e72bf
To support single-flight Size and ModTime queries against backend storage file, we are replacing the CurrentSize call with a Stat call. A FileInfo interface is provided for backends to provide a type, with a default implementation called FileInfoInternal, for use by driver implementations. More work needs to follow this change to update all the driver implementations.
80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
package storagedriver
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import "time"
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// FileInfo returns information about a given path. Inspired by os.FileInfo,
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// it elides the base name method for a full path instead.
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type FileInfo interface {
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// Path provides the full path of the target of this file info.
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Path() string
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// Size returns current length in bytes of the file. The return value can
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// be used to write to the end of the file at path. The value is
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// meaningless if IsDir returns true.
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Size() int64
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// ModTime returns the modification time for the file. For backends that
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// don't have a modification time, the creation time should be returned.
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ModTime() time.Time
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// IsDir returns true if the path is a directory.
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IsDir() bool
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}
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// NOTE(stevvooe): The next two types, FileInfoFields and FileInfoInternal
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// should only be used by storagedriver implementations. They should moved to
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// a "driver" package, similar to database/sql.
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// FileInfoFields provides the exported fields for implementing FileInfo
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// interface in storagedriver implementations. It should be used with
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// InternalFileInfo.
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type FileInfoFields struct {
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// Path provides the full path of the target of this file info.
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Path string
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// Size is current length in bytes of the file. The value of this field
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// can be used to write to the end of the file at path. The value is
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// meaningless if IsDir is set to true.
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Size int64
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// ModTime returns the modification time for the file. For backends that
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// don't have a modification time, the creation time should be returned.
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ModTime time.Time
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// IsDir returns true if the path is a directory.
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IsDir bool
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}
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// FileInfoInternal implements the FileInfo interface. This should only be
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// used by storagedriver implementations that don't have a specialized
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// FileInfo type.
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type FileInfoInternal struct {
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FileInfoFields
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}
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var _ FileInfo = FileInfoInternal{}
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var _ FileInfo = &FileInfoInternal{}
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// Path provides the full path of the target of this file info.
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func (fi FileInfoInternal) Path() string {
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return fi.FileInfoFields.Path
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}
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// Size returns current length in bytes of the file. The return value can
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// be used to write to the end of the file at path. The value is
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// meaningless if IsDir returns true.
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func (fi FileInfoInternal) Size() int64 {
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return fi.FileInfoFields.Size
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}
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// ModTime returns the modification time for the file. For backends that
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// don't have a modification time, the creation time should be returned.
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func (fi FileInfoInternal) ModTime() time.Time {
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return fi.FileInfoFields.ModTime
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}
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// IsDir returns true if the path is a directory.
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func (fi FileInfoInternal) IsDir() bool {
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return fi.FileInfoFields.IsDir
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}
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