proposer

type Windower interface {
	// Proposers returns the proposer list for building a block at [blockHeight]
	// when the validator set is defined at [pChainHeight]. The list is returned
	// in order. The minimum delay of a validator is the index they appear times
	// [WindowDuration].
	Proposers(
		ctx context.Context,
		blockHeight,
		pChainHeight uint64,
		maxWindows int,
	) ([]ids.NodeID, error)

	// Delay returns the amount of time that [validatorID] must wait before
	// building a block at [blockHeight] when the validator set is defined at
	// [pChainHeight].
	Delay(
		ctx context.Context,
		blockHeight,
		pChainHeight uint64,
		validatorID ids.NodeID,
		maxWindows int,
	) (time.Duration, error)

	// In the Post-Durango windowing scheme, every validator active at
	// [pChainHeight] gets specific slots it can propose in (instead of being
	// able to propose from a given time on as it happens Pre-Durango).
	// [ExpectedProposer] calculates which nodeID is scheduled to propose a
	// block of height [blockHeight] at [slot].
	// If no validators are currently available, [ErrAnyoneCanPropose] is
	// returned.
	ExpectedProposer(
		ctx context.Context,
		blockHeight,
		pChainHeight,
		slot uint64,
	) (ids.NodeID, error)

	// In the Post-Durango windowing scheme, every validator active at
	// [pChainHeight] gets specific slots it can propose in (instead of being
	// able to propose from a given time on as it happens Pre-Durango).
	// [MinDelayForProposer] specifies how long [nodeID] needs to wait for its
	// slot to start. Delay is specified as starting from slot zero start.
	// (which is parent timestamp). For efficiency reasons, we cap the slot
	// search to [MaxLookAheadSlots].
	// If no validators are currently available, [ErrAnyoneCanPropose] is
	// returned.
	MinDelayForProposer(
		ctx context.Context,
		blockHeight,
		pChainHeight uint64,
		nodeID ids.NodeID,
		startSlot uint64,
	) (time.Duration, error)
}