procedure

func IndexNewBlock ¶

func IndexNewBlock(blockID flow.Identifier, parentID flow.Identifier) func(*badger.Txn) error

IndexNewBlock will add parent-child index for the new block.

• Each block has a parent, we use this parent-child relationship to build a reverse index
• for looking up children blocks for a given block. This is useful for forks recovery where we want to find all the pending children blocks for the lastest finalized block.

When adding parent-child index for a new block, we will add two indexes:

1. since it's a new block, the new block should have no child, so adding an empty index for the new block. Note: It's impossible there is a block whose parent is the new block.
2. since the parent block has this new block as a child, adding an index for that. there are two special cases for (2): - if the parent block is zero, then we don't need to add this index. - if the parent block doesn't exist, then we will insert the child index instead of updating

func LookupBlockChildren ¶

func LookupBlockChildren(blockID flow.Identifier, childrenIDs *flow.IdentifierList) func(tx *badger.Txn) error

LookupBlockChildren looks up the IDs of all child blocks of the given parent block.