Function validate_leaf_parent

atomic-core/src/crdt/apply/leaf.rs:395–415

Validates that a leaf belongs to the specified branch. # Arguments `txn` - The transaction `leaf_id` - The leaf to validate `expected_branch` - The expected parent branch # Returns `Ok(())` if the leaf belongs to the branch.

(
    txn: &T,
    leaf_id: LeafId,
    expected_branch: BranchId,
)

///
/// `Ok(())` if the leaf belongs to the branch.
pub fn validate_leaf_parent<T: MutCrdtTxnT>(
    txn: &T,
    leaf_id: LeafId,
    expected_branch: BranchId,
) -> ApplyResult<()> {
    let leaf = txn
        .get_leaf(leaf_id)
        .map_err(|e| storage_err(e, "getting leaf"))?
        .ok_or_else(|| ApplyError::leaf_not_found(leaf_id))?;

    if leaf.branch() != expected_branch {
        return Err(ApplyError::internal(format!(
            "Leaf {} belongs to branch {}, not {}",
            leaf_id,
            leaf.branch(),
            expected_branch
        )));
    }

    Ok(())
}

// Tests