301 lines
7.4 KiB
Rust
301 lines
7.4 KiB
Rust
use crate::prelude::*;
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struct ServerResponse {
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mac: Option <[u8; 6]>,
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nickname: Option <String>,
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}
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struct ConfigFile {
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nicknames: HashMap <String, String>,
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}
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struct ClientParams {
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common: app_common::Params,
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bind_addrs: Vec <Ipv4Addr>,
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nicknames: HashMap <String, String>,
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timeout_ms: u64,
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}
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pub async fn client <I: Iterator <Item=String>> (args: I) -> Result <(), AppError> {
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match get_mac_address() {
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Ok(Some(ma)) => {
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println!("Our MAC addr = {}", ma);
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}
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Ok(None) => println!("No MAC address found."),
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Err(e) => println!("{:?}", e),
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}
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let params = configure_client (args)?;
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let socket = make_socket (¶ms.common, params.bind_addrs).await?;
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let msg = Message::new_request1 ().to_vec ()?;
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tokio::spawn (send_requests (Arc::clone (&socket), params.common, msg));
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let mut peers = HashMap::with_capacity (10);
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timeout (Duration::from_millis (params.timeout_ms), listen_for_responses (&*socket, params.nicknames, &mut peers)).await.ok ();
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let mut peers: Vec <_> = peers.into_iter ().collect ();
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peers.sort_by_key (|(_, v)| v.mac);
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println! ("Found {} peers:", peers.len ());
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for (ip, resp) in peers.into_iter () {
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let mac = match resp.mac {
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None => {
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println! ("<Unknown> = {}", ip);
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continue;
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},
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Some (x) => x,
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};
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let nickname = match resp.nickname {
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None => {
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println! ("{} = {}", MacAddress::new (mac), ip.ip ());
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continue;
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},
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Some (x) => x,
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};
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println! ("{} = {} `{}`", MacAddress::new (mac), ip.ip (), nickname);
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}
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Ok (())
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}
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pub async fn find_nick <I: Iterator <Item=String>> (mut args: I) -> Result <(), AppError>
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{
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let mut nick = None;
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let mut timeout_ms = 500;
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let ConfigFile {
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nicknames,
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} = load_config_file ();
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while let Some (arg) = args.next () {
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match arg.as_str () {
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"--timeout-ms" => {
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timeout_ms = match args.next () {
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None => return Err (CliArgError::MissingArgumentValue (arg).into ()),
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Some (x) => u64::from_str (&x)?,
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};
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},
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_ => nick = Some (arg),
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}
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}
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let needle_nick = nick.ok_or_else (|| CliArgError::MissingRequiredArg ("nickname".to_string ()))?;
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let needle_nick = Some (needle_nick);
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let common_params = Default::default ();
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let socket = make_socket (&common_params, get_ips ()?).await?;
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let msg = Message::new_request1 ().to_vec ()?;
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tokio::spawn (send_requests (Arc::clone (&socket), common_params, msg));
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timeout (Duration::from_millis (timeout_ms), async move { loop {
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let (msgs, remote_addr) = match recv_msg_from (&socket).await {
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Err (_) => continue,
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Ok (x) => x,
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};
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let mut resp = ServerResponse {
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mac: None,
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nickname: None,
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};
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for msg in msgs.into_iter () {
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match msg {
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Message::Response1 (x) => resp.mac = x,
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Message::Response2 (x) => resp.nickname = Some (x.nickname),
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_ => (),
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}
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}
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resp.nickname = get_peer_nickname (&nicknames, resp.mac, resp.nickname);
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if resp.nickname == needle_nick {
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println! ("{}", remote_addr.ip ());
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return;
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}
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}}).await?;
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Ok (())
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}
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fn configure_client <I: Iterator <Item=String>> (mut args: I)
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-> Result <ClientParams, AppError>
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{
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let mut bind_addrs = vec! [];
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let mut timeout_ms = 500;
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let ConfigFile {
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nicknames,
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} = load_config_file ();
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while let Some (arg) = args.next () {
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match arg.as_str () {
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"--bind-addr" => {
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bind_addrs.push (match args.next () {
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None => return Err (CliArgError::MissingArgumentValue (arg).into ()),
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Some (x) => Ipv4Addr::from_str (&x)?,
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});
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},
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"--timeout-ms" => {
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timeout_ms = match args.next () {
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None => return Err (CliArgError::MissingArgumentValue (arg).into ()),
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Some (x) => u64::from_str (&x)?,
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};
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},
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_ => return Err (CliArgError::UnrecognizedArgument (arg).into ()),
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}
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}
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if bind_addrs.is_empty () {
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bind_addrs = get_ips ()?;
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}
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Ok (ClientParams {
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common: Default::default (),
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bind_addrs,
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nicknames,
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timeout_ms,
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})
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}
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fn load_config_file () -> ConfigFile {
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let mut nicknames: HashMap <String, String> = Default::default ();
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if let Some (proj_dirs) = find_project_dirs () {
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let mut ini = Ini::new_cs ();
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let path = proj_dirs.config_dir ().join ("client.ini");
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if ini.load (&path).is_ok () {
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let map_ref = ini.get_map_ref ();
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if let Some (x) = map_ref.get ("nicknames") {
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for (k, v) in x {
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if let Some (v) = v {
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let k = k.replace ('-', ":");
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nicknames.insert (k, v.to_string ());
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}
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}
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}
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}
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}
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ConfigFile {
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nicknames,
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}
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}
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async fn make_socket (
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common_params: &app_common::Params,
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bind_addrs: Vec <Ipv4Addr>,
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) -> Result <Arc <UdpSocket>, AppError> {
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let socket = UdpSocket::bind (SocketAddrV4::new (Ipv4Addr::UNSPECIFIED, 0)).await?;
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for bind_addr in &bind_addrs {
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if let Err (e) = socket.join_multicast_v4 (common_params.multicast_addr, *bind_addr) {
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println! ("Error joining multicast group with iface {}: {:?}", bind_addr, e);
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}
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}
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Ok (Arc::new (socket))
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}
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async fn send_requests (
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socket: Arc <UdpSocket>,
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params: app_common::Params,
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msg: Vec <u8>,
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)
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-> Result <(), AppError>
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{
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for _ in 0..10 {
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socket.send_to (&msg, (params.multicast_addr, params.server_port)).await?;
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sleep (Duration::from_millis (100)).await;
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}
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Ok::<_, AppError> (())
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}
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async fn listen_for_responses (
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socket: &UdpSocket,
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nicknames: HashMap <String, String>,
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peers: &mut HashMap <SocketAddr, ServerResponse>
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) {
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loop {
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let (msgs, remote_addr) = match recv_msg_from (socket).await {
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Err (_) => continue,
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Ok (x) => x,
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};
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let mut resp = ServerResponse {
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mac: None,
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nickname: None,
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};
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for msg in msgs.into_iter () {
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match msg {
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Message::Response1 (x) => resp.mac = x,
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Message::Response2 (x) => resp.nickname = Some (x.nickname),
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_ => (),
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}
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}
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resp.nickname = get_peer_nickname (&nicknames, resp.mac, resp.nickname);
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peers.insert (remote_addr, resp);
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}
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}
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fn get_peer_nickname (
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nicknames: &HashMap <String, String>,
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mac: Option <[u8; 6]>,
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peer_nickname: Option <String>
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) -> Option <String>
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{
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match peer_nickname.as_ref ().map (String::as_str) {
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None => (),
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Some ("") => (),
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_ => return peer_nickname,
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}
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if let Some (mac) = &mac {
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return nicknames.get (&format! ("{}", MacAddress::new (*mac))).cloned ()
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}
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None
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}
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#[cfg (test)]
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mod test {
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use super::*;
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#[test]
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fn test_nicknames () {
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let mut nicks = HashMap::new ();
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for (k, v) in [
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("01:01:01:01:01:01", "phoenix")
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] {
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nicks.insert (k.to_string (), v.to_string ());
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}
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for (num, (mac, peer_nickname), expected) in [
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// Somehow the server returns no MAC nor nick. In this case we are helpless
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( 1, (None, None), None),
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// If the server tells us its MAC, we can look up our nickname for it
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( 2, (Some ([1, 1, 1, 1, 1, 1]), None), Some ("phoenix")),
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// Unless it's not in our nick list.
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( 3, (Some ([1, 1, 1, 1, 1, 2]), None), None),
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// If the server tells us its nickname, that always takes priority
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( 4, (None, Some ("snowflake")), Some ("snowflake")),
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( 5, (Some ([1, 1, 1, 1, 1, 1]), Some ("snowflake")), Some ("snowflake")),
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( 6, (Some ([1, 1, 1, 1, 1, 2]), Some ("snowflake")), Some ("snowflake")),
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// But blank nicknames are treated like None
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( 7, (None, Some ("")), None),
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( 8, (Some ([1, 1, 1, 1, 1, 1]), Some ("")), Some ("phoenix")),
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( 9, (Some ([1, 1, 1, 1, 1, 2]), Some ("")), None),
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] {
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let actual = get_peer_nickname (&nicks, mac, peer_nickname.map (str::to_string));
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assert_eq! (actual.as_ref ().map (String::as_str), expected, "{}", num);
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}
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}
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}
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