Function safe_app::immutable_data::get_value

pub fn get_value(
    client: &impl Client, 
    address: Address, 
    position: Option<u64>, 
    len: Option<u64>, 
    decryption_key: Option<Key>
) -> Box<dyn Future<Error = CoreError, Item = Vec<u8>> + 'static>

Get immutable data from the network and extract its value, decrypting it in the process (if keys provided). This combines get_idata in Client and extract_value in this module into one function.