Method FetchBlockByCount

sqlchain/chain.go:890–910

FetchBlockByCount fetches the block at specified count from local cache.

(count int32)

// FetchBlockByCount fetches the block at specified count from local cache.
func (c *Chain) FetchBlockByCount(count int32) (b *types.Block, realCount int32, height int32, err error) {
	var n *blockNode

	if count < 0 {
		n = c.rt.getHead().node
	} else {
		n = c.rt.getHead().node.ancestorByCount(count)
	}

	if n != nil {
		b, err = c.fetchBlockByIndexKey(n.indexKey())
		if err != nil {
			return
		}

		height = n.height
		realCount = n.count
	}

	return
}

func (c *Chain) fetchBlockByIndexKey(indexKey []byte) (b *types.Block, err error) {
	k := utils.ConcatAll(c.metaBlockIndex, indexKey)