api

type Device interface {
	Attach(DeviceReceiver) error
	Detach(DeviceReceiver) error

	// ID returns device identifier
	DeviceID() string

	// DeviceType indicates which kind of device it is
	// e.g. block, vfio or vhost user
	DeviceType() config.DeviceType

	// GetMajorMinor returns major and minor numbers
	GetMajorMinor() (int64, int64)

	// GetHostPath return the device path in the host
	GetHostPath() string

	// GetDeviceInfo returns device specific data used for hotplugging by hypervisor
	// Caller could cast the return value to device specific struct
	// e.g. Block device returns *config.BlockDrive,
	// vfio device returns []*config.VFIODev,
	// VhostUser device returns []*config.VhostUserDeviceAttrs
	GetDeviceInfo() interface{}

	// GetAttachCount returns how many times the device has been attached
	GetAttachCount() uint

	// Reference adds one reference to device then returns final ref count
	Reference() uint

	// Dereference removes one reference to device then returns final ref count
	Dereference() uint

	// Save converts Device to DeviceState
	Save() persistapi.DeviceState

	// Load loads DeviceState and converts it to specific device
	Load(persistapi.DeviceState)
}

type DeviceManager interface {
	NewDevice(config.DeviceInfo) (Device, error)
	RemoveDevice(string) error
	AttachDevice(string, DeviceReceiver) error
	DetachDevice(string, DeviceReceiver) error
	IsDeviceAttached(string) bool
	GetDeviceByID(string) Device
	GetAllDevices() []Device
	LoadDevices([]persistapi.DeviceState)
}

type DeviceReceiver interface {
	// these are for hotplug/hot-unplug devices to/from hypervisor
	HotplugAddDevice(Device, config.DeviceType) error
	HotplugRemoveDevice(Device, config.DeviceType) error

	// this is only for virtio-blk and virtio-scsi support
	GetAndSetSandboxBlockIndex() (int, error)

	// Offset w.r.t. the sandbox block index, to be used when determining
	// a virtio-block drive name.
	GetSandboxBlockOffset() int

	UnsetSandboxBlockIndex(int) error
	GetHypervisorType() string

	// this is for appending device to hypervisor boot params
	AppendDevice(Device) error
}

type MockDeviceReceiver struct{}