pyramid

type FS interface {
	io.Closer

	// Create creates a new file in the FS.
	// It will only be persistent after the returned file is stored.
	Create(ctx context.Context, storageID, namespace string) (StoredFile, error)

	// Open finds the referenced file and returns its read-only File.
	// If file isn't in the local disk, it is fetched from the block storage.
	Open(ctx context.Context, storageID, namespace, filename string) (File, error)

	// Exists returns true if filename currently exists on block storage.
	Exists(ctx context.Context, storageID, namespace, filename string) (bool, error)

	// GetRemoteURI returns the URI for filename on block storage.  That URI might not
	// resolve if filename does not exist.
	GetRemoteURI(ctx context.Context, filename string) (string, error)
}

type File interface {
	io.Reader
	io.Writer
	io.Closer
	io.ReaderAt
	Sync() error
	Stat() (os.FileInfo, error)
}

type ROFile struct {
	*os.File
	// contains filtered or unexported fields
}

type StoredFile interface {
	File

	// Store - Successful operation guarantees that the file is persistent.
	// If the file wasn't closed, Store closes it.
	Store(ctx context.Context, filename string) error

	// Abort removes all traces of the file from the filesystem.
	// It's allowed to call Abort on the file at any stage, unless the file was already stored.
	Abort(ctx context.Context) error
}

type TierFS struct {
	// contains filtered or unexported fields
}

type WRFile struct {
	*os.File
	// contains filtered or unexported fields
}