receive

type Content struct {
	Signal chan interface{} `json:"-"`

	// ------------------------------------------
	// stack identify which layer should this content be placed, all the files will be referencing the content
	Stack int64 `json:"t"`

	// offset is non-zero if the file is in the delta bundle body
	Offset int64 `json:"o,omitempty"`

	// size is the size of the compressed content
	Size int64 `json:"s"`

	Chunks []*FileChunk `json:"c"`

	Digest string `json:"d"`
}

type DeltaBundle struct {
	Source      *Image `json:"s"`
	Destination *Image `json:"d"`

	// contents and BodyLength are computed by Builder.computeDelta()
	Contents   []*Content `json:"c"`
	BodyLength int64      `json:"bl"`

	// RequestedFiles are all the files in the requested images
	// Use this to reconstruct the file system
	RequestedFiles []*ReferencedFile `json:"rf"`
}

type File struct {
	common.TOCEntry
	Chunks []*FileChunk `json:"c,omitempty"`
	FsId   int64        `json:"-"`
}

type FileChunk struct {
	Offset         int64 `json:"o"`
	ChunkOffset    int64 `json:"c"`
	ChunkSize      int64 `json:"h"`
	CompressedSize int64 `json:"s"`
}

type Image struct {
	Serial int64         `json:"s"`
	Layers []*ImageLayer `json:"l"`
}

type ImageLayer struct {
	Size   int64 `json:"s"`
	Serial int64 `json:"f"`

	// Hash is the digest of the compressed layer
	Hash string `json:"h"`

	// path to the local storage
	Local string
}

type ReferencedFile struct {
	File

	// Stack in the existing image from bottom to top, 0-indexed
	Stack int64 `json:"S"`

	// if the file is available on the client then ReferenceFsId is non-zero,
	// expecting the file is available on the client and can be accessed using the File.Digest .
	// (This is the Serial index in the database `filesystem.id`)
	ReferenceFsId int64 `json:"R,omitempty"`

	// if the file is not available on the client but on other layers in the requested image，
	// then ReferenceFsId is zero and ReferenceStack is non-zero,
	// expecting the file content in the delta bundle body
	// (This is Stack not Serial, 0-indexed)
	ReferenceStack int64 `json:"T,omitempty"`

	// PayloadOrder is set if the file is not available on the client, then PayloadOrder is non-zero.
	// It indicates the order of the file in the delta bundle body (payload)
	PayloadOrder int `json:"O,omitempty"`

	// if Ready is nil or closed, means the file is ready
	Ready *chan interface{} `json:"-"`
	// contains filtered or unexported fields
}