Function solana_ledger::blockstore::handle_chaining_for_slot

fn handle_chaining_for_slot(
    db: &Database,
    write_batch: &mut WriteBatch<'_>,
    working_set: &HashMap<u64, SlotMetaWorkingSetEntry>,
    new_chained_slots: &mut HashMap<u64, Rc<RefCell<SlotMeta>>>,
    slot: Slot
) -> Result<()>

A helper function of handle_chaining which handles the chaining based on the SlotMetaWorkingSetEntry of the specified slot. Specifically, it handles the following two things:

1. based on the SlotMetaWorkingSetEntry for slot, check if slot did not previously have a parent slot but does now. If slot satisfies this condition, update the Orphan property of both slot and its parent slot based on their current orphan status. Specifically:

• updates the orphan property of slot to no longer be an orphan because it has a parent.
• adds the parent to the orphan column family if the parent’s parent is currently unknown.

2. if the SlotMetaWorkingSetEntry for slot indicates this slot is newly connected to a parent slot, then this function will update the is_connected property of all its direct and indirect children slots.

This function may update column family cf::Orphans and indirectly update SlotMeta from its output parameter new_chained_slots.

Arguments: db: the underlying db for blockstore write_batch: the write batch which includes all the updates of the the current write and ensures their atomicity. working_set: the working set which include the specified slot new_chained_slots: an output parameter which includes all the slots which connectivity have been updated. slot: the slot which we want to handle its chaining effect.