state

type BlockState interface {
	GetBlock(blkID ids.ID) (block.Block, choices.Status, error)
	PutBlock(blk block.Block, status choices.Status) error
}

type ChainState interface {
	SetLastAccepted(blkID ids.ID) error
	DeleteLastAccepted() error
	GetLastAccepted() (ids.ID, error)
}

type HeightIndex interface {
	HeightIndexWriter
	HeightIndexGetter
	HeightIndexBatchSupport

	// ResetHeightIndex deletes all index DB entries
	ResetHeightIndex() error
}

type HeightIndexBatchSupport interface {
	versiondb.Commitable

	GetCheckpoint() (ids.ID, error)
	SetCheckpoint(blkID ids.ID) error
	DeleteCheckpoint() error
}

type HeightIndexGetter interface {
	GetBlockIDAtHeight(height uint64) (ids.ID, error)

	// Fork height is stored when the first post-fork block/option is accepted.
	// Before that, fork height won't be found.
	GetForkHeight() (uint64, error)
}

type HeightIndexWriter interface {
	SetBlockIDAtHeight(height uint64, blkID ids.ID) error
	SetForkHeight(height uint64) error
}

type State interface {
	ChainState
	BlockState
	HeightIndex
}