Function send_inv

chapter 4/server.rs:118–129

(addr: &str, op_type: OpType, blocks: &[Vec<u8>])

}

fn send_inv(addr: &str, op_type: OpType, blocks: &[Vec<u8>]) {
    let socket_addr = addr.parse().unwrap();
    let node_addr = GLOBAL_CONFIG.get_node_addr().parse().unwrap();
    send_data(
        socket_addr,
        Package::Inv {
            addr_from: node_addr,
            op_type,
            items: blocks.to_vec(),
        },
    );
}

fn send_block(addr: &str, block: &Block) {
    let socket_addr = addr.parse().unwrap();