diff -r 7732013ce64c -r c5a6e8566425 rust/hedgewars-server/src/core/server.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/hedgewars-server/src/core/server.rs	Tue May 28 19:04:18 2019 +0300
@@ -0,0 +1,285 @@
+use super::{
+    client::HWClient,
+    types::{ClientId, RoomId},
+    indexslab::IndexSlab,
+    room::HWRoom,
+};
+use crate::{
+    utils,
+    protocol::messages::HWProtocolMessage::Greeting
+};
+
+use bitflags::*;
+use log::*;
+use slab;
+use std::{borrow::BorrowMut, iter, num::NonZeroU16};
+
+type Slab<T> = slab::Slab<T>;
+
+pub struct HWAnteClient {
+    pub nick: Option<String>,
+    pub protocol_number: Option<NonZeroU16>,
+    pub server_salt: String,
+    pub is_checker: bool,
+}
+
+pub struct HWAnteroom {
+    pub clients: IndexSlab<HWAnteClient>,
+}
+
+impl HWAnteroom {
+    pub fn new(clients_limit: usize) -> Self {
+        let clients = IndexSlab::with_capacity(clients_limit);
+        HWAnteroom { clients }
+    }
+
+    pub fn add_client(&mut self, client_id: ClientId, salt: String) {
+        let client = HWAnteClient {
+            nick: None,
+            protocol_number: None,
+            server_salt: salt,
+            is_checker: false,
+        };
+        self.clients.insert(client_id, client);
+    }
+
+    pub fn remove_client(&mut self, client_id: ClientId) -> Option<HWAnteClient> {
+        let mut client = self.clients.remove(client_id);
+        client
+    }
+}
+
+pub struct ServerGreetings {
+    pub for_latest_protocol: String,
+    pub for_old_protocols: String,
+}
+
+impl ServerGreetings {
+    fn new() -> Self {
+        Self {
+            for_latest_protocol: "\u{1f994} is watching".to_string(),
+            for_old_protocols: "\u{1f994} is watching".to_string(),
+        }
+    }
+}
+
+bitflags! {
+    pub struct ServerFlags: u8 {
+        const REGISTERED_ONLY = 0b0000_1000;
+    }
+}
+
+pub struct HWServer {
+    pub clients: IndexSlab<HWClient>,
+    pub rooms: Slab<HWRoom>,
+    pub anteroom: HWAnteroom,
+    pub latest_protocol: u16,
+    pub flags: ServerFlags,
+    pub greetings: ServerGreetings,
+}
+
+impl HWServer {
+    pub fn new(clients_limit: usize, rooms_limit: usize) -> Self {
+        let rooms = Slab::with_capacity(rooms_limit);
+        let clients = IndexSlab::with_capacity(clients_limit);
+        Self {
+            clients,
+            rooms,
+            anteroom: HWAnteroom::new(clients_limit),
+            greetings: ServerGreetings::new(),
+            latest_protocol: 58,
+            flags: ServerFlags::empty(),
+        }
+    }
+
+    pub fn add_client(&mut self, client_id: ClientId, data: HWAnteClient) {
+        if let (Some(protocol), Some(nick)) = (data.protocol_number, data.nick) {
+            let mut client = HWClient::new(client_id, protocol.get(), nick);
+            client.set_is_checker(data.is_checker);
+            self.clients.insert(client_id, client);
+        }
+    }
+
+    pub fn remove_client(&mut self, client_id: ClientId) {
+        self.clients.remove(client_id);
+    }
+
+    pub fn get_greetings(&self, client_id: ClientId) -> &str {
+        if self.clients[client_id].protocol_number < self.latest_protocol {
+            &self.greetings.for_old_protocols
+        } else {
+            &self.greetings.for_latest_protocol
+        }
+    }
+
+    #[inline]
+    pub fn create_room(
+        &mut self,
+        creator_id: ClientId,
+        name: String,
+        password: Option<String>,
+    ) -> RoomId {
+        create_room(
+            &mut self.clients[creator_id],
+            &mut self.rooms,
+            name,
+            password,
+        )
+    }
+
+    #[inline]
+    pub fn move_to_room(&mut self, client_id: ClientId, room_id: RoomId) {
+        move_to_room(&mut self.clients[client_id], &mut self.rooms[room_id])
+    }
+
+    pub fn has_room(&self, name: &str) -> bool {
+        self.find_room(name).is_some()
+    }
+
+    pub fn find_room(&self, name: &str) -> Option<&HWRoom> {
+        self.rooms
+            .iter()
+            .find_map(|(_, r)| Some(r).filter(|r| r.name == name))
+    }
+
+    pub fn find_room_mut(&mut self, name: &str) -> Option<&mut HWRoom> {
+        self.rooms
+            .iter_mut()
+            .find_map(|(_, r)| Some(r).filter(|r| r.name == name))
+    }
+
+    pub fn find_client(&self, nick: &str) -> Option<&HWClient> {
+        self.clients
+            .iter()
+            .find_map(|(_, c)| Some(c).filter(|c| c.nick == nick))
+    }
+
+    pub fn find_client_mut(&mut self, nick: &str) -> Option<&mut HWClient> {
+        self.clients
+            .iter_mut()
+            .find_map(|(_, c)| Some(c).filter(|c| c.nick == nick))
+    }
+
+    pub fn all_clients(&self) -> impl Iterator<Item = ClientId> + '_ {
+        self.clients.iter().map(|(id, _)| id)
+    }
+
+    pub fn filter_clients<'a, F>(&'a self, f: F) -> impl Iterator<Item = ClientId> + 'a
+    where
+        F: Fn(&(usize, &HWClient)) -> bool + 'a,
+    {
+        self.clients.iter().filter(f).map(|(_, c)| c.id)
+    }
+
+    pub fn filter_rooms<'a, F>(&'a self, f: F) -> impl Iterator<Item = RoomId> + 'a
+    where
+        F: Fn(&(usize, &HWRoom)) -> bool + 'a,
+    {
+        self.rooms.iter().filter(f).map(|(_, c)| c.id)
+    }
+
+    pub fn collect_clients<F>(&self, f: F) -> Vec<ClientId>
+    where
+        F: Fn(&(usize, &HWClient)) -> bool,
+    {
+        self.filter_clients(f).collect()
+    }
+
+    pub fn collect_nicks<F>(&self, f: F) -> Vec<String>
+    where
+        F: Fn(&(usize, &HWClient)) -> bool,
+    {
+        self.clients
+            .iter()
+            .filter(f)
+            .map(|(_, c)| c.nick.clone())
+            .collect()
+    }
+
+    pub fn lobby_clients(&self) -> impl Iterator<Item = ClientId> + '_ {
+        self.filter_clients(|(_, c)| c.room_id == None)
+    }
+
+    pub fn room_clients(&self, room_id: RoomId) -> impl Iterator<Item = ClientId> + '_ {
+        self.filter_clients(move |(_, c)| c.room_id == Some(room_id))
+    }
+
+    pub fn protocol_clients(&self, protocol: u16) -> impl Iterator<Item = ClientId> + '_ {
+        self.filter_clients(move |(_, c)| c.protocol_number == protocol)
+    }
+
+    pub fn protocol_rooms(&self, protocol: u16) -> impl Iterator<Item = RoomId> + '_ {
+        self.filter_rooms(move |(_, r)| r.protocol_number == protocol)
+    }
+
+    pub fn other_clients_in_room(&self, self_id: ClientId) -> Vec<ClientId> {
+        let room_id = self.clients[self_id].room_id;
+        self.collect_clients(|(id, c)| *id != self_id && c.room_id == room_id)
+    }
+
+    pub fn is_registered_only(&self) -> bool {
+        self.flags.contains(ServerFlags::REGISTERED_ONLY)
+    }
+
+    pub fn set_is_registered_only(&mut self, value: bool) {
+        self.flags.set(ServerFlags::REGISTERED_ONLY, value)
+    }
+}
+
+fn allocate_room(rooms: &mut Slab<HWRoom>) -> &mut HWRoom {
+    let entry = rooms.vacant_entry();
+    let room = HWRoom::new(entry.key());
+    entry.insert(room)
+}
+
+fn create_room(
+    client: &mut HWClient,
+    rooms: &mut Slab<HWRoom>,
+    name: String,
+    password: Option<String>,
+) -> RoomId {
+    let room = allocate_room(rooms);
+
+    room.master_id = Some(client.id);
+    room.name = name;
+    room.password = password;
+    room.protocol_number = client.protocol_number;
+
+    room.players_number = 1;
+    room.ready_players_number = 1;
+
+    client.room_id = Some(room.id);
+    client.set_is_master(true);
+    client.set_is_ready(true);
+    client.set_is_joined_mid_game(false);
+
+    room.id
+}
+
+fn move_to_room(client: &mut HWClient, room: &mut HWRoom) {
+    debug_assert!(client.room_id != Some(room.id));
+
+    room.players_number += 1;
+
+    client.room_id = Some(room.id);
+    client.set_is_joined_mid_game(room.game_info.is_some());
+    client.set_is_in_game(room.game_info.is_some());
+
+    if let Some(ref mut info) = room.game_info {
+        let teams = info.client_teams(client.id);
+        client.teams_in_game = teams.clone().count() as u8;
+        client.clan = teams.clone().next().map(|t| t.color);
+        let team_names: Vec<_> = teams.map(|t| t.name.clone()).collect();
+
+        if !team_names.is_empty() {
+            info.left_teams.retain(|name| !team_names.contains(&name));
+            info.teams_in_game += team_names.len() as u8;
+            room.teams = info
+                .teams_at_start
+                .iter()
+                .filter(|(_, t)| !team_names.contains(&t.name))
+                .cloned()
+                .collect();
+        }
+    }
+}