Function validate_branch_parent

atomic-core/src/crdt/apply/branch.rs:446–466

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

(
    txn: &T,
    branch_id: BranchId,
    expected_trunk: TrunkId,
)

///
/// `Ok(())` if the branch belongs to the trunk.
pub fn validate_branch_parent<T: MutCrdtTxnT>(
    txn: &T,
    branch_id: BranchId,
    expected_trunk: TrunkId,
) -> ApplyResult<()> {
    let branch = txn
        .get_branch(branch_id)
        .map_err(|e| storage_err(e, "getting branch"))?
        .ok_or_else(|| ApplyError::branch_not_found(branch_id))?;

    if branch.trunk() != expected_trunk {
        return Err(ApplyError::internal(format!(
            "Branch {} belongs to trunk {}, not {}",
            branch_id,
            branch.trunk(),
            expected_trunk
        )));
    }

    Ok(())
}

// Tests