Modeling the Internet from the scratch: Link-layer, LAN, Switch - Code snippet: Host, Interface

host.go

package link

type Transmitter interface {
    Transmit(frame []byte) error
}

type Interface interface {
    Transmitter
    EndPoint
    Address() types.HwAddr
}

// NetHandler receives serialized frame payload. With this, doing some high-level protocol
type NetHandler interface {
    Handle(pl []byte)
}

type Host struct {
    Interface  Interface
    netHandler NetHandler
    frmEnc     *FrameEncoder
    frmDec     *FrameDecoder
}