// GetRangeTree fetches the RangeTree proto and sets up the range tree context.
func getRangeTree(txn *client.Txn) (*treeContext, error) {
tree := new(RangeTree)
if err := txn.GetProto(keys.RangeTreeRoot, tree); err != nil {
return nil, err
}
return &treeContext{
txn: txn,
tree: tree,
dirty: false,
nodes: map[string]cachedNode{},
}, nil
}
// GetTableDescFromID retrieves the table descriptor for the table
// ID passed in using an existing txn. Teturns an error if the
// descriptor doesn't exist or if it exists and is not a table.
func GetTableDescFromID(txn *client.Txn, id ID) (*TableDescriptor, error) {
desc := &Descriptor{}
descKey := MakeDescMetadataKey(id)
if err := txn.GetProto(descKey, desc); err != nil {
return nil, err
}
table := desc.GetTable()
if table == nil {
return nil, ErrDescriptorNotFound
}
return table, nil
}