Merge pull request #10 from mat-1/azalea-entity

azalea-entity

1 files changed, 673 insertions, 0 deletions

diff --git a/azalea-client/src/client.rs b/azalea-client/src/client.rs
new file mode 100644
index 00000000..dfefe4ad
--- /dev/null
+++ b/azalea-client/src/client.rs
@@ -0,0 +1,673 @@
+use crate::{Account, Player};
+use azalea_auth::game_profile::GameProfile;
+use azalea_core::{ChunkPos, EntityPos, PositionDelta, PositionDeltaTrait, ResourceLocation};
+use azalea_entity::Entity;
+use azalea_protocol::{
+    connect::{GameConnection, HandshakeConnection},
+    packets::{
+        game::{
+            clientbound_player_chat_packet::ClientboundPlayerChatPacket,
+            clientbound_system_chat_packet::ClientboundSystemChatPacket,
+            serverbound_accept_teleportation_packet::ServerboundAcceptTeleportationPacket,
+            serverbound_custom_payload_packet::ServerboundCustomPayloadPacket,
+            serverbound_keep_alive_packet::ServerboundKeepAlivePacket,
+            serverbound_move_player_packet_pos_rot::ServerboundMovePlayerPacketPosRot, GamePacket,
+        },
+        handshake::client_intention_packet::ClientIntentionPacket,
+        login::{
+            serverbound_hello_packet::ServerboundHelloPacket,
+            serverbound_key_packet::{NonceOrSaltSignature, ServerboundKeyPacket},
+            LoginPacket,
+        },
+        ConnectionProtocol, PROTOCOL_VERSION,
+    },
+    resolver, ServerAddress,
+};
+use azalea_world::World;
+use owning_ref::OwningRef;
+use std::{
+    fmt::Debug,
+    sync::{Arc, Mutex},
+};
+use tokio::{
+    sync::mpsc::{self, UnboundedReceiver, UnboundedSender},
+    time::{self, MissedTickBehavior},
+};
+
+#[derive(Default)]
+pub struct ClientState {
+    pub player: Player,
+    pub world: Option<World>,
+}
+
+#[derive(Debug, Clone)]
+pub enum Event {
+    Login,
+    Chat(ChatPacket),
+    /// A game tick, happens 20 times per second.
+    GameTick,
+}
+
+#[derive(Debug, Clone)]
+pub enum ChatPacket {
+    System(ClientboundSystemChatPacket),
+    Player(Box<ClientboundPlayerChatPacket>),
+}
+
+// impl ChatPacket {
+//     pub fn message(&self) -> &str {
+//         match self {
+//             ChatPacket::System(p) => &p.content,
+//             ChatPacket::Player(p) => &p.message,
+//         }
+//     }
+// }
+
+/// A player that you can control that is currently in a Minecraft server.
+pub struct Client {
+    event_receiver: UnboundedReceiver<Event>,
+    game_profile: GameProfile,
+    pub conn: Arc<tokio::sync::Mutex<GameConnection>>,
+    pub state: Arc<Mutex<ClientState>>,
+    // game_loop
+}
+
+/// Whether we should ignore errors when decoding packets.
+const IGNORE_ERRORS: bool = !cfg!(debug_assertions);
+
+#[derive(Debug)]
+struct HandleError(String);
+
+impl Client {
+    /// Connect to a Minecraft server with an account.
+    pub async fn join(account: &Account, address: &ServerAddress) -> Result<Self, String> {
+        let resolved_address = resolver::resolve_address(address).await?;
+
+        let mut conn = HandshakeConnection::new(&resolved_address).await?;
+
+        // handshake
+        conn.write(
+            ClientIntentionPacket {
+                protocol_version: PROTOCOL_VERSION,
+                hostname: address.host.clone(),
+                port: address.port,
+                intention: ConnectionProtocol::Login,
+            }
+            .get(),
+        )
+        .await;
+        let mut conn = conn.login();
+
+        // login
+        conn.write(
+            ServerboundHelloPacket {
+                username: account.username.clone(),
+                public_key: None,
+            }
+            .get(),
+        )
+        .await;
+
+        let (conn, game_profile) = loop {
+            let packet_result = conn.read().await;
+            match packet_result {
+                Ok(packet) => match packet {
+                    LoginPacket::ClientboundHelloPacket(p) => {
+                        println!("Got encryption request");
+                        let e = azalea_crypto::encrypt(&p.public_key, &p.nonce).unwrap();
+
+                        // TODO: authenticate with the server here (authenticateServer)
+
+                        conn.write(
+                            ServerboundKeyPacket {
+                                nonce_or_salt_signature: NonceOrSaltSignature::Nonce(
+                                    e.encrypted_nonce,
+                                ),
+                                key_bytes: e.encrypted_public_key,
+                            }
+                            .get(),
+                        )
+                        .await;
+                        conn.set_encryption_key(e.secret_key);
+                    }
+                    LoginPacket::ClientboundLoginCompressionPacket(p) => {
+                        println!("Got compression request {:?}", p.compression_threshold);
+                        conn.set_compression_threshold(p.compression_threshold);
+                    }
+                    LoginPacket::ClientboundGameProfilePacket(p) => {
+                        println!("Got profile {:?}", p.game_profile);
+                        break (conn.game(), p.game_profile);
+                    }
+                    LoginPacket::ClientboundLoginDisconnectPacket(p) => {
+                        println!("Got disconnect {:?}", p);
+                    }
+                    LoginPacket::ClientboundCustomQueryPacket(p) => {
+                        println!("Got custom query {:?}", p);
+                    }
+                    _ => panic!("Unexpected packet {:?}", packet),
+                },
+                Err(e) => {
+                    panic!("Error: {:?}", e);
+                }
+            }
+        };
+
+        let conn = Arc::new(tokio::sync::Mutex::new(conn));
+
+        let (tx, rx) = mpsc::unbounded_channel();
+
+        // we got the GameConnection, so the server is now connected :)
+        let client = Client {
+            game_profile: game_profile.clone(),
+            event_receiver: rx,
+            conn: conn.clone(),
+            state: Arc::new(Mutex::new(ClientState::default())),
+        };
+
+        // just start up the game loop and we're ready!
+
+        let game_loop_state = client.state.clone();
+
+        // if you get an error right here that means you're doing something with locks wrong
+        // read the error to see where the issue is
+        // you might be able to just drop the lock or put it in its own scope to fix
+        tokio::spawn(Self::protocol_loop(
+            conn.clone(),
+            tx.clone(),
+            game_loop_state.clone(),
+            game_profile.clone(),
+        ));
+        tokio::spawn(Self::game_tick_loop(conn, tx, game_loop_state));
+
+        Ok(client)
+    }
+
+    async fn protocol_loop(
+        conn: Arc<tokio::sync::Mutex<GameConnection>>,
+        tx: UnboundedSender<Event>,
+        state: Arc<Mutex<ClientState>>,
+        game_profile: GameProfile,
+    ) {
+        loop {
+            let r = conn.lock().await.read().await;
+            match r {
+                Ok(packet) => {
+                    match Self::handle(&packet, &tx, &state, &conn, &game_profile).await {
+                        Ok(_) => {}
+                        Err(e) => {
+                            println!("Error handling packet: {:?}", e);
+                            if IGNORE_ERRORS {
+                                continue;
+                            } else {
+                                panic!("Error handling packet: {:?}", e);
+                            }
+                        }
+                    }
+                }
+                Err(e) => {
+                    if IGNORE_ERRORS {
+                        println!("Error: {:?}", e);
+                        if e == "length wider than 21-bit" {
+                            panic!();
+                        }
+                    } else {
+                        panic!("Error: {:?}", e);
+                    }
+                }
+            };
+        }
+    }
+
+    async fn handle(
+        packet: &GamePacket,
+        tx: &UnboundedSender<Event>,
+        state: &Arc<Mutex<ClientState>>,
+        conn: &Arc<tokio::sync::Mutex<GameConnection>>,
+        game_profile: &GameProfile,
+    ) -> Result<(), HandleError> {
+        match packet {
+            GamePacket::ClientboundLoginPacket(p) => {
+                println!("Got login packet {:?}", p);
+
+                {
+                    let mut state_lock = state.lock()?;
+
+                    // // write p into login.txt
+                    // std::io::Write::write_all(
+                    //     &mut std::fs::File::create("login.txt").unwrap(),
+                    //     format!("{:#?}", p).as_bytes(),
+                    // )
+                    // .unwrap();
+
+                    // TODO: have registry_holder be a struct because this sucks rn
+                    // best way would be to add serde support to azalea-nbt
+
+                    let registry_holder = p
+                        .registry_holder
+                        .as_compound()
+                        .expect("Registry holder is not a compound")
+                        .get("")
+                        .expect("No \"\" tag")
+                        .as_compound()
+                        .expect("\"\" tag is not a compound");
+                    let dimension_types = registry_holder
+                        .get("minecraft:dimension_type")
+                        .expect("No dimension_type tag")
+                        .as_compound()
+                        .expect("dimension_type is not a compound")
+                        .get("value")
+                        .expect("No dimension_type value")
+                        .as_list()
+                        .expect("dimension_type value is not a list");
+                    let dimension_type = dimension_types
+                        .iter()
+                        .find(|t| {
+                            t.as_compound()
+                                .expect("dimension_type value is not a compound")
+                                .get("name")
+                                .expect("No name tag")
+                                .as_string()
+                                .expect("name is not a string")
+                                == p.dimension_type.to_string()
+                        })
+                        .unwrap_or_else(|| {
+                            panic!("No dimension_type with name {}", p.dimension_type)
+                        })
+                        .as_compound()
+                        .unwrap()
+                        .get("element")
+                        .expect("No element tag")
+                        .as_compound()
+                        .expect("element is not a compound");
+                    let height = (*dimension_type
+                        .get("height")
+                        .expect("No height tag")
+                        .as_int()
+                        .expect("height tag is not an int"))
+                    .try_into()
+                    .expect("height is not a u32");
+                    let min_y = *dimension_type
+                        .get("min_y")
+                        .expect("No min_y tag")
+                        .as_int()
+                        .expect("min_y tag is not an int");
+
+                    // the 16 here is our render distance
+                    // i'll make this an actual setting later
+                    state_lock.world = Some(World::new(16, height, min_y));
+
+                    let entity = Entity::new(p.player_id, game_profile.uuid, EntityPos::default());
+                    state_lock
+                        .world
+                        .as_mut()
+                        .expect("World doesn't exist! We should've gotten a login packet by now.")
+                        .add_entity(entity);
+
+                    state_lock.player.set_entity_id(p.player_id);
+                }
+
+                conn.lock()
+                    .await
+                    .write(
+                        ServerboundCustomPayloadPacket {
+                            identifier: ResourceLocation::new("brand").unwrap(),
+                            // they don't have to know :)
+                            data: "vanilla".into(),
+                        }
+                        .get(),
+                    )
+                    .await;
+
+                tx.send(Event::Login).unwrap();
+            }
+            GamePacket::ClientboundUpdateViewDistancePacket(p) => {
+                println!("Got view distance packet {:?}", p);
+            }
+            GamePacket::ClientboundCustomPayloadPacket(p) => {
+                println!("Got custom payload packet {:?}", p);
+            }
+            GamePacket::ClientboundChangeDifficultyPacket(p) => {
+                println!("Got difficulty packet {:?}", p);
+            }
+            GamePacket::ClientboundDeclareCommandsPacket(_p) => {
+                println!("Got declare commands packet");
+            }
+            GamePacket::ClientboundPlayerAbilitiesPacket(p) => {
+                println!("Got player abilities packet {:?}", p);
+            }
+            GamePacket::ClientboundSetCarriedItemPacket(p) => {
+                println!("Got set carried item packet {:?}", p);
+            }
+            GamePacket::ClientboundUpdateTagsPacket(_p) => {
+                println!("Got update tags packet");
+            }
+            GamePacket::ClientboundDisconnectPacket(p) => {
+                println!("Got disconnect packet {:?}", p);
+            }
+            GamePacket::ClientboundUpdateRecipesPacket(_p) => {
+                println!("Got update recipes packet");
+            }
+            GamePacket::ClientboundEntityEventPacket(_p) => {
+                // println!("Got entity event packet {:?}", p);
+            }
+            GamePacket::ClientboundRecipePacket(_p) => {
+                println!("Got recipe packet");
+            }
+            GamePacket::ClientboundPlayerPositionPacket(p) => {
+                // TODO: reply with teleport confirm
+                println!("Got player position packet {:?}", p);
+
+                let (new_pos, y_rot, x_rot) = {
+                    let mut state_lock = state.lock()?;
+                    let player_entity_id = state_lock.player.entity_id;
+                    let world = state_lock.world.as_mut().unwrap();
+                    let player_entity = world
+                        .mut_entity_by_id(player_entity_id)
+                        .expect("Player entity doesn't exist");
+                    let delta_movement = &player_entity.delta;
+
+                    let is_x_relative = p.relative_arguments.x;
+                    let is_y_relative = p.relative_arguments.y;
+                    let is_z_relative = p.relative_arguments.z;
+
+                    let (delta_x, new_pos_x) = if is_x_relative {
+                        player_entity.old_pos.x += p.x;
+                        (delta_movement.x(), player_entity.pos().x + p.x)
+                    } else {
+                        player_entity.old_pos.x = p.x;
+                        (0.0, p.x)
+                    };
+                    let (delta_y, new_pos_y) = if is_y_relative {
+                        player_entity.old_pos.y += p.y;
+                        (delta_movement.y(), player_entity.pos().y + p.y)
+                    } else {
+                        player_entity.old_pos.y = p.y;
+                        (0.0, p.y)
+                    };
+                    let (delta_z, new_pos_z) = if is_z_relative {
+                        player_entity.old_pos.z += p.z;
+                        (delta_movement.z(), player_entity.pos().z + p.z)
+                    } else {
+                        player_entity.old_pos.z = p.z;
+                        (0.0, p.z)
+                    };
+
+                    let mut y_rot = p.y_rot;
+                    let mut x_rot = p.x_rot;
+                    if p.relative_arguments.x_rot {
+                        y_rot += player_entity.x_rot;
+                    }
+                    if p.relative_arguments.y_rot {
+                        x_rot += player_entity.y_rot;
+                    }
+
+                    player_entity.delta = PositionDelta {
+                        xa: delta_x,
+                        ya: delta_y,
+                        za: delta_z,
+                    };
+                    player_entity.set_rotation(y_rot, x_rot);
+                    // TODO: minecraft sets "xo", "yo", and "zo" here but idk what that means
+                    // so investigate that ig
+                    let new_pos = EntityPos {
+                        x: new_pos_x,
+                        y: new_pos_y,
+                        z: new_pos_z,
+                    };
+                    world
+                        .move_entity(player_entity_id, new_pos)
+                        .expect("The player entity should always exist");
+
+                    (new_pos, y_rot, x_rot)
+                };
+
+                let mut conn_lock = conn.lock().await;
+                conn_lock
+                    .write(ServerboundAcceptTeleportationPacket { id: p.id }.get())
+                    .await;
+                conn_lock
+                    .write(
+                        ServerboundMovePlayerPacketPosRot {
+                            x: new_pos.x,
+                            y: new_pos.y,
+                            z: new_pos.z,
+                            y_rot,
+                            x_rot,
+                            // this is always false
+                            on_ground: false,
+                        }
+                        .get(),
+                    )
+                    .await;
+            }
+            GamePacket::ClientboundPlayerInfoPacket(p) => {
+                println!("Got player info packet {:?}", p);
+            }
+            GamePacket::ClientboundSetChunkCacheCenterPacket(p) => {
+                println!("Got chunk cache center packet {:?}", p);
+                state
+                    .lock()?
+                    .world
+                    .as_mut()
+                    .unwrap()
+                    .update_view_center(&ChunkPos::new(p.x, p.z));
+            }
+            GamePacket::ClientboundLevelChunkWithLightPacket(p) => {
+                println!("Got chunk with light packet {} {}", p.x, p.z);
+                let pos = ChunkPos::new(p.x, p.z);
+                // let chunk = Chunk::read_with_world_height(&mut p.chunk_data);
+                // println("chunk {:?}")
+                state
+                    .lock()?
+                    .world
+                    .as_mut()
+                    .expect("World doesn't exist! We should've gotten a login packet by now.")
+                    .replace_with_packet_data(&pos, &mut p.chunk_data.data.as_slice())
+                    .unwrap();
+            }
+            GamePacket::ClientboundLightUpdatePacket(p) => {
+                println!("Got light update packet {:?}", p);
+            }
+            GamePacket::ClientboundAddEntityPacket(p) => {
+                println!("Got add entity packet {:?}", p);
+                let entity = Entity::from(p);
+                state
+                    .lock()?
+                    .world
+                    .as_mut()
+                    .expect("World doesn't exist! We should've gotten a login packet by now.")
+                    .add_entity(entity);
+            }
+            GamePacket::ClientboundSetEntityDataPacket(_p) => {
+                // println!("Got set entity data packet {:?}", p);
+            }
+            GamePacket::ClientboundUpdateAttributesPacket(_p) => {
+                // println!("Got update attributes packet {:?}", p);
+            }
+            GamePacket::ClientboundEntityVelocityPacket(_p) => {
+                // println!("Got entity velocity packet {:?}", p);
+            }
+            GamePacket::ClientboundSetEntityLinkPacket(p) => {
+                println!("Got set entity link packet {:?}", p);
+            }
+            GamePacket::ClientboundAddPlayerPacket(p) => {
+                println!("Got add player packet {:?}", p);
+                let entity = Entity::from(p);
+                state
+                    .lock()?
+                    .world
+                    .as_mut()
+                    .expect("World doesn't exist! We should've gotten a login packet by now.")
+                    .add_entity(entity);
+            }
+            GamePacket::ClientboundInitializeBorderPacket(p) => {
+                println!("Got initialize border packet {:?}", p);
+            }
+            GamePacket::ClientboundSetTimePacket(p) => {
+                println!("Got set time packet {:?}", p);
+            }
+            GamePacket::ClientboundSetDefaultSpawnPositionPacket(p) => {
+                println!("Got set default spawn position packet {:?}", p);
+            }
+            GamePacket::ClientboundContainerSetContentPacket(p) => {
+                println!("Got container set content packet {:?}", p);
+            }
+            GamePacket::ClientboundSetHealthPacket(p) => {
+                println!("Got set health packet {:?}", p);
+            }
+            GamePacket::ClientboundSetExperiencePacket(p) => {
+                println!("Got set experience packet {:?}", p);
+            }
+            GamePacket::ClientboundTeleportEntityPacket(p) => {
+                let mut state_lock = state.lock()?;
+                let world = state_lock.world.as_mut().unwrap();
+
+                world.move_entity(
+                    p.id,
+                    EntityPos {
+                        x: p.x,
+                        y: p.y,
+                        z: p.z,
+                    },
+                )?;
+            }
+            GamePacket::ClientboundUpdateAdvancementsPacket(p) => {
+                println!("Got update advancements packet {:?}", p);
+            }
+            GamePacket::ClientboundRotateHeadPacket(_p) => {
+                // println!("Got rotate head packet {:?}", p);
+            }
+            GamePacket::ClientboundMoveEntityPosPacket(p) => {
+                let mut state_lock = state.lock()?;
+                let world = state_lock.world.as_mut().unwrap();
+
+                world.move_entity_with_delta(p.entity_id, &p.delta)?;
+            }
+            GamePacket::ClientboundMoveEntityPosRotPacket(p) => {
+                let mut state_lock = state.lock()?;
+                let world = state_lock.world.as_mut().unwrap();
+
+                world.move_entity_with_delta(p.entity_id, &p.delta)?;
+            }
+            GamePacket::ClientboundMoveEntityRotPacket(p) => {
+                println!("Got move entity rot packet {:?}", p);
+            }
+            GamePacket::ClientboundKeepAlivePacket(p) => {
+                println!("Got keep alive packet {:?}", p);
+                conn.lock()
+                    .await
+                    .write(ServerboundKeepAlivePacket { id: p.id }.get())
+                    .await;
+            }
+            GamePacket::ClientboundRemoveEntitiesPacket(p) => {
+                println!("Got remove entities packet {:?}", p);
+            }
+            GamePacket::ClientboundPlayerChatPacket(p) => {
+                println!("Got player chat packet {:?}", p);
+                tx.send(Event::Chat(ChatPacket::Player(Box::new(p.clone()))))
+                    .unwrap();
+            }
+            GamePacket::ClientboundSystemChatPacket(p) => {
+                println!("Got system chat packet {:?}", p);
+                tx.send(Event::Chat(ChatPacket::System(p.clone()))).unwrap();
+            }
+            GamePacket::ClientboundSoundPacket(p) => {
+                println!("Got sound packet {:?}", p);
+            }
+            GamePacket::ClientboundLevelEventPacket(p) => {
+                println!("Got level event packet {:?}", p);
+            }
+            GamePacket::ClientboundBlockUpdatePacket(p) => {
+                println!("Got block update packet {:?}", p);
+                // TODO: update world
+            }
+            GamePacket::ClientboundAnimatePacket(p) => {
+                println!("Got animate packet {:?}", p);
+            }
+            GamePacket::ClientboundSectionBlocksUpdatePacket(p) => {
+                println!("Got section blocks update packet {:?}", p);
+                // TODO: update world
+            }
+            GamePacket::ClientboundGameEventPacket(p) => {
+                println!("Got game event packet {:?}", p);
+            }
+            GamePacket::ClientboundLevelParticlesPacket(p) => {
+                println!("Got level particles packet {:?}", p);
+            }
+            GamePacket::ClientboundServerDataPacket(p) => {
+                println!("Got server data packet {:?}", p);
+            }
+            GamePacket::ClientboundSetEquipmentPacket(p) => {
+                println!("Got set equipment packet {:?}", p);
+            }
+            GamePacket::ClientboundUpdateMobEffectPacket(p) => {
+                println!("Got update mob effect packet {:?}", p);
+            }
+            _ => panic!("Unexpected packet {:?}", packet),
+        }
+
+        Ok(())
+    }
+
+    pub async fn next(&mut self) -> Option<Event> {
+        self.event_receiver.recv().await
+    }
+
+    /// Runs game_tick every 50 milliseconds.
+    async fn game_tick_loop(
+        conn: Arc<tokio::sync::Mutex<GameConnection>>,
+        tx: UnboundedSender<Event>,
+        state: Arc<Mutex<ClientState>>,
+    ) {
+        let mut game_tick_interval = time::interval(time::Duration::from_millis(50));
+        // TODO: Minecraft bursts up to 10 ticks and then skips, we should too
+        game_tick_interval.set_missed_tick_behavior(time::MissedTickBehavior::Burst);
+        loop {
+            game_tick_interval.tick().await;
+            Self::game_tick(&conn, &tx, &state).await;
+        }
+    }
+
+    /// Runs every 50 milliseconds.
+    async fn game_tick(
+        conn: &Arc<tokio::sync::Mutex<GameConnection>>,
+        tx: &UnboundedSender<Event>,
+        state: &Arc<Mutex<ClientState>>,
+    ) {
+        if state.lock().unwrap().world.is_none() {
+            return;
+        }
+        tx.send(Event::GameTick).unwrap();
+    }
+
+    /// Gets the `World` the client is in.
+    ///
+    /// This is basically a shortcut for `client.state.lock().unwrap().world.as_ref().unwrap()`.
+    /// If the client hasn't received a login packet yet, this will panic.
+    pub fn world(&self) -> OwningRef<std::sync::MutexGuard<ClientState>, World> {
+        let state_lock: std::sync::MutexGuard<ClientState> = self.state.lock().unwrap();
+        let state_lock_ref = OwningRef::new(state_lock);
+        state_lock_ref.map(|state| state.world.as_ref().expect("World doesn't exist!"))
+    }
+
+    /// Gets the `Player` struct for our player.
+    ///
+    /// This is basically a shortcut for `client.state.lock().unwrap().player`.
+    pub fn player(&self) -> OwningRef<std::sync::MutexGuard<ClientState>, Player> {
+        let state_lock: std::sync::MutexGuard<ClientState> = self.state.lock().unwrap();
+        let state_lock_ref = OwningRef::new(state_lock);
+        state_lock_ref.map(|state| &state.player)
+    }
+}
+
+impl<T> From<std::sync::PoisonError<T>> for HandleError {
+    fn from(e: std::sync::PoisonError<T>) -> Self {
+        HandleError(e.to_string())
+    }
+}
+
+impl From<String> for HandleError {
+    fn from(e: String) -> Self {
+        HandleError(e)
+    }
+}