properly separate clients in characterlogin server handling

src/login/character.rs

@@ -1,6 +1,7 @@
 use std::net;
 use std::sync::Arc;
 use std::io::Read;
+use std::collections::HashMap;
 
 use rand::{Rng, RngCore};
 use bcrypt::{DEFAULT_COST, hash, verify};
@@ -29,6 +30,7 @@ pub const CHARACTER_PORT: u16 = 12001;
 
 #[derive(Debug)]
 pub enum CharacterError {
+    ClientNotFound(ClientId),
 }
 
 #[derive(Debug)]
@@ -123,18 +125,29 @@ fn generate_param_data(path: &str) -> (ParamDataHeader, Vec<u8>) {
     }, buffer)
 }
 
-// TODO: rip these client-specific vars into a HashMap<ClientId, ClientState>
-pub struct CharacterServerState<DA: DataAccess> {
-    //shared_state: SharedLoginState<DA>,
-    data_access: DA,
-    param_header: ParamDataHeader,
-
+struct ClientState {
     param_index: usize,
-    param_data: Arc<Vec<u8>>,
     user: Option<UserAccount>,
     characters: Option<[Option<Character>; 4]>,
     guildcard_data_buffer: Option<Vec<u8>>,
+}
+
+impl ClientState {
+    fn new() -> ClientState {
+        ClientState {
+            param_index: 0,
+            user: None,
+            characters: None,
+            guildcard_data_buffer: None,
+        }
+    }
+}
 
+pub struct CharacterServerState<DA: DataAccess> {
+    data_access: DA,
+    param_header: ParamDataHeader,
+    param_data: Vec<u8>,
+    clients: HashMap<ClientId, ClientState>,
 }
 
 impl<DA: DataAccess> CharacterServerState<DA> {
@@ -145,32 +158,32 @@ impl<DA: DataAccess> CharacterServerState<DA> {
             //shared_state: shared_state,
             data_access: data_access,
             param_header: param_header,
-
-            param_index: 0,
-            param_data: Arc::new(param_data),
-            user: None,
-            characters: None,
-            guildcard_data_buffer: None,
+            param_data: param_data,
+            clients: HashMap::new(),
         }
     }
 
-    fn validate_login(&mut self, pkt: &Login) -> Vec<SendCharacterPacket> {
-        match get_login_status(&self.data_access, pkt) {
+    fn validate_login(&mut self, id: ClientId, pkt: &Login) -> Result<Vec<SendCharacterPacket>, CharacterError> {
+        let client = self.clients.get_mut(&id).ok_or(CharacterError::ClientNotFound(id))?;
+        Ok(match get_login_status(&self.data_access, pkt) {
             Ok(user) => {
                 let mut response = LoginResponse::by_status(AccountStatus::Ok, pkt.security_data);
                 response.guildcard = user.guildcard.map_or(0, |gc| gc) as u32;
                 response.team_id = user.team_id.map_or(0, |ti| ti) as u32;
-                self.user = Some(user);
+                client.user = Some(user);
                 vec![SendCharacterPacket::LoginResponse(response)]
             },
             Err(err) => {
                 vec![SendCharacterPacket::LoginResponse(LoginResponse::by_status(err, pkt.security_data))]
             }
-        }
+        })
     }
 
-    fn get_settings(&mut self) -> Vec<SendCharacterPacket> {
-        let user = self.user.as_ref().unwrap();
+    fn get_settings(&mut self, id: ClientId) -> Result<Vec<SendCharacterPacket>, CharacterError> {
+        let client = self.clients.get_mut(&id).ok_or(CharacterError::ClientNotFound(id))?;
+        let user = client.user.as_ref().unwrap();
+
+        // TODO: this should error (data should be added on account creation, why did I copy this silly sylv logic?)
         let settings = match self.data_access.get_user_settings_by_user(&user) {
             Some(settings) => settings,
             None => self.data_access.create_user_settings_by_user(&user),
@@ -180,16 +193,17 @@ impl<DA: DataAccess> CharacterServerState<DA> {
                                               settings.settings.joystick_config, 0, 0);
         let pkt = SendCharacterPacket::SendKeyAndTeamSettings(pkt);
 
-        vec![pkt]
+        Ok(vec![pkt])
     }
 
-    fn char_select(&mut self, select: &CharSelect) -> Vec<SendCharacterPacket> {
-        if self.characters.is_none() {
-            self.characters = Some(self.data_access.get_characters_by_user(self.user.as_ref().unwrap()));
+    fn char_select(&mut self, id: ClientId, select: &CharSelect) -> Result<Vec<SendCharacterPacket>, CharacterError> {
+        let client = self.clients.get_mut(&id).ok_or(CharacterError::ClientNotFound(id))?;
+        if client.characters.is_none() {
+            client.characters = Some(self.data_access.get_characters_by_user(client.user.as_ref().unwrap()));
         }
 
-        let chars = self.characters.as_ref().unwrap();
-        if let Some(char) = &chars[select.slot as usize] {
+        let chars = client.characters.as_ref().unwrap();
+        Ok(if let Some(char) = &chars[select.slot as usize] {
             vec![SendCharacterPacket::CharacterPreview(CharacterPreview {
                 flag: 0,
                 slot: select.slot,
@@ -202,7 +216,7 @@ impl<DA: DataAccess> CharacterServerState<DA> {
                 slot: select.slot,
                 code: 2,
             })]
-        }
+        })
     }
 
     fn validate_checksum(&mut self) -> Vec<SendCharacterPacket> {
@@ -212,31 +226,32 @@ impl<DA: DataAccess> CharacterServerState<DA> {
         })]
     }
 
-    fn guildcard_data_header(&mut self) -> Vec<SendCharacterPacket> {
-        let guildcard_data = self.data_access.get_guild_card_data_by_user(self.user.as_ref().unwrap());
+    fn guildcard_data_header(&mut self, id: ClientId) -> Result<Vec<SendCharacterPacket>, CharacterError> {
+        let client = self.clients.get_mut(&id).ok_or(CharacterError::ClientNotFound(id))?;
+        let guildcard_data = self.data_access.get_guild_card_data_by_user(client.user.as_ref().unwrap());
 
         let bytes = guildcard_data.guildcard.as_bytes();
         let mut crc = crc32::Digest::new(crc32::IEEE);
         crc.write(&bytes[..]);
-        self.guildcard_data_buffer = Some(bytes.to_vec());
+        client.guildcard_data_buffer = Some(bytes.to_vec());
 
-        vec![SendCharacterPacket::GuildcardDataHeader(GuildcardDataHeader::new(bytes.len(), crc.sum32()))]
+        Ok(vec![SendCharacterPacket::GuildcardDataHeader(GuildcardDataHeader::new(bytes.len(), crc.sum32()))])
     }
 
-    fn guildcard_data_chunk(&mut self, chunk: u32, again: u32) -> Vec<SendCharacterPacket> {
-        if again != 0 {
+    fn guildcard_data_chunk(&mut self, id: ClientId, chunk: u32, again: u32) -> Result<Vec<SendCharacterPacket>, CharacterError> {
+        let client = self.clients.get_mut(&id).ok_or(CharacterError::ClientNotFound(id))?;
+        Ok(if again != 0 {
             let start = chunk as usize * GUILD_CARD_CHUNK_SIZE;
-            let len = std::cmp::min(GUILD_CARD_CHUNK_SIZE, self.guildcard_data_buffer.as_ref().unwrap().len() as usize - start);
+            let len = std::cmp::min(GUILD_CARD_CHUNK_SIZE, client.guildcard_data_buffer.as_ref().unwrap().len() as usize - start);
             let end = start + len;
 
             let mut buf = [0u8; GUILD_CARD_CHUNK_SIZE as usize];
-            buf[..len as usize].copy_from_slice(&self.guildcard_data_buffer.as_ref().unwrap()[start..end]);
+            buf[..len as usize].copy_from_slice(&client.guildcard_data_buffer.as_ref().unwrap()[start..end]);
 
             vec![SendCharacterPacket::GuildcardDataChunk(GuildcardDataChunk::new(chunk, buf, len))]
         } else {
             Vec::new()
-        }
-
+        })
     }
 
 }
@@ -247,6 +262,8 @@ impl<DA: DataAccess> ServerState for CharacterServerState<DA> {
     type PacketError = CharacterError;
 
     fn on_connect(&mut self, id: ClientId) -> Vec<OnConnect<Self::SendPacket>> {
+        self.clients.insert(id, ClientState::new());
+
         let mut rng = rand::thread_rng();
 
         let mut server_key = [0u8; 48];
@@ -260,32 +277,34 @@ impl<DA: DataAccess> ServerState for CharacterServerState<DA> {
         ]
     }
 
-    fn handle(&mut self, id: ClientId, pkt: &RecvCharacterPacket) -> Box<dyn Iterator<Item = (ClientId, SendCharacterPacket)>> {
-        match pkt {
+    fn handle(&mut self, id: ClientId, pkt: &RecvCharacterPacket)
+              -> Result<Box<dyn Iterator<Item = (ClientId, SendCharacterPacket)>>, CharacterError> {
+        Ok(match pkt {
             RecvCharacterPacket::Login(login) => {
-                Box::new(self.validate_login(login).into_iter().map(move |pkt| (id, pkt)))
+                Box::new(self.validate_login(id, login)?.into_iter().map(move |pkt| (id, pkt)))
             },
             RecvCharacterPacket::RequestSettings(_req) => {
-                Box::new(self.get_settings().into_iter().map(move |pkt| (id, pkt)))
+                Box::new(self.get_settings(id)?.into_iter().map(move |pkt| (id, pkt)))
             },
             RecvCharacterPacket::CharSelect(sel) => {
-                Box::new(self.char_select(sel).into_iter().map(move |pkt| (id, pkt)))
+                Box::new(self.char_select(id, sel)?.into_iter().map(move |pkt| (id, pkt)))
             },
             RecvCharacterPacket::Checksum(_checksum) => {
                 Box::new(self.validate_checksum().into_iter().map(move |pkt| (id, pkt)))
             },
             RecvCharacterPacket::GuildcardDataRequest(_request) => {
-                Box::new(self.guildcard_data_header().into_iter().map(move |pkt| (id, pkt)))
+                Box::new(self.guildcard_data_header(id)?.into_iter().map(move |pkt| (id, pkt)))
             },
             RecvCharacterPacket::GuildcardDataChunkRequest(request) => {
-                Box::new(self.guildcard_data_chunk(request.chunk, request.again).into_iter().map(move |pkt| (id, pkt)))
+                Box::new(self.guildcard_data_chunk(id, request.chunk, request.again)?.into_iter().map(move |pkt| (id, pkt)))
             },
             RecvCharacterPacket::ParamDataRequest(_request) => {
                 Box::new(vec![SendCharacterPacket::ParamDataHeader(self.param_header.clone())].into_iter().map(move |pkt| (id, pkt)))
             },
             RecvCharacterPacket::ParamDataChunkRequest(_request) => {
-                let chunk = self.param_index;
-                self.param_index += 1;
+                let client = self.clients.get_mut(&id).ok_or(CharacterError::ClientNotFound(id))?;
+                let chunk = client.param_index;
+                client.param_index += 1;
 
                 let start = chunk * 0x6800;
                 let end = std::cmp::min((chunk+1)*0x6800, self.param_data.len());
@@ -301,7 +320,7 @@ impl<DA: DataAccess> ServerState for CharacterServerState<DA> {
                     }
                 )].into_iter().map(move |pkt| (id, pkt)))
             }
-        }
+        })
     }
 }
 
@@ -328,7 +347,8 @@ mod test {
         }
 
         let mut server = CharacterServerState::new(TestData {});
-        server.user = Some(UserAccount {
+        let mut clientstate = ClientState::new();
+        clientstate.user = Some(UserAccount {
             id: 1,
             username: "testuser".to_owned(),
             password: bcrypt::hash("mypassword", 5).unwrap(),
@@ -338,8 +358,11 @@ mod test {
             muted_until: SystemTime::now(),
             created_at: SystemTime::now(),
         });
+        server.clients.insert(ClientId(5), clientstate);
 
-        let send = server.handle(ClientId(5), &RecvCharacterPacket::RequestSettings(RequestSettings {flag: 0})).collect::<Vec<_>>();
+        let send = server.handle(ClientId(5), &RecvCharacterPacket::RequestSettings(RequestSettings {flag: 0}))
+            .unwrap()
+            .collect::<Vec<_>>();
         assert!(send.len() == 1);
 
         assert!(send[0].0 == ClientId(5));
@@ -356,7 +379,7 @@ mod test {
         let send = server.handle(ClientId(1), &RecvCharacterPacket::Checksum(Checksum {flag: 0,
                                                                                        checksum: 1234,
                                                                                        padding: 0,
-        })).collect::<Vec<_>>();
+        })).unwrap().collect::<Vec<_>>();
         assert!(send.len() == 1);
 
         let bytes = send[0].1.as_bytes();