headtracker

type Config interface {
	BlockEmissionIdleWarningThreshold() time.Duration
	EvmFinalityDepth() uint32
	EvmHeadTrackerHistoryDepth() uint32
	EvmHeadTrackerMaxBufferSize() uint32
	EvmHeadTrackerSamplingInterval() time.Duration
}

type Heads interface {
	// LatestHead returns the block header with the highest number that has been seen, or nil.
	LatestHead() *evmtypes.Head
	// HeadByHash returns a head for the specified hash, or nil.
	HeadByHash(hash common.Hash) *evmtypes.Head
	// AddHeads adds newHeads to the collection, eliminates duplicates,
	// sorts by head number, fixes parents and cuts off old heads (historyDepth).
	AddHeads(historyDepth uint, newHeads ...*evmtypes.Head)
	// Count returns number of heads in the collection.
	Count() int
}

type ORM interface {
	// IdempotentInsertHead inserts a head only if the hash is new. Will do nothing if hash exists already.
	// No advisory lock required because this is thread safe.
	IdempotentInsertHead(ctx context.Context, head *evmtypes.Head) error
	// TrimOldHeads deletes heads such that only the top N block numbers remain
	TrimOldHeads(ctx context.Context, n uint) (err error)
	// LatestHead returns the highest seen head
	LatestHead(ctx context.Context) (head *evmtypes.Head, err error)
	// LatestHeads returns the latest heads up to given limit
	LatestHeads(ctx context.Context, limit uint) (heads []*evmtypes.Head, err error)
	// HeadByHash fetches the head with the given hash from the db, returns nil if none exists
	HeadByHash(ctx context.Context, hash common.Hash) (head *evmtypes.Head, err error)
}