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Simplify packet macro

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Now every packet implements McBufWritable and McBufReadable and uses those so the code doesn't have to be duplicated.
This commit is contained in:
mat 2022-04-30 23:04:18 -05:00
parent 0dc6decf7f
commit 8313952541
8 changed files with 68 additions and 85 deletions
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2
Cargo.lock generated
View file

@ -75,7 +75,6 @@ checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
name = "azalea-auth"
version = "0.1.0"
dependencies = [
"num-bigint",
"uuid",
]
@ -97,6 +96,7 @@ name = "azalea-client"
version = "0.1.0"
dependencies = [
"azalea-auth",
"azalea-core",
"azalea-crypto",
"azalea-protocol",
"tokio",

1
azalea-auth/Cargo.toml
View file

@ -6,5 +6,4 @@ version = "0.1.0"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
num-bigint = "^0.4.3"
uuid = "^0.8.2"

1
azalea-client/Cargo.toml
View file

@ -7,6 +7,7 @@ version = "0.1.0"
[dependencies]
azalea-auth = {path = "../azalea-auth"}
azalea-core = {path = "../azalea-core"}
azalea-crypto = {path = "../azalea-crypto"}
azalea-protocol = {path = "../azalea-protocol"}
tokio = {version = "1.18.0", features = ["sync"]}

18
azalea-client/src/connect.rs
View file

@ -1,7 +1,9 @@
use crate::Player;
use azalea_core::resource_location::ResourceLocation;
use azalea_protocol::{
connect::{GameConnection, HandshakeConnection},
packets::{
game::GamePacket,
game::{serverbound_custom_payload_packet::ServerboundCustomPayloadPacket, GamePacket},
handshake::client_intention_packet::ClientIntentionPacket,
login::{
serverbound_hello_packet::ServerboundHelloPacket,
@ -15,8 +17,6 @@ use std::sync::Arc;
use tokio::sync::mpsc::{self, UnboundedReceiver, UnboundedSender};
use tokio::sync::Mutex;
use crate::Player;
///! Connect to Minecraft servers.
/// Something that can join Minecraft servers.
@ -148,7 +148,7 @@ impl Client {
loop {
let r = conn.lock().await.read().await;
match r {
Ok(packet) => Self::handle(&packet, &tx, &state).await,
Ok(packet) => Self::handle(&packet, &tx, &state, &conn).await,
Err(e) => {
panic!("Error: {:?}", e);
}
@ -160,12 +160,21 @@ impl Client {
packet: &GamePacket,
tx: &UnboundedSender<Event>,
state: &Arc<Mutex<ClientState>>,
conn: &Arc<Mutex<GameConnection>>,
) {
match packet {
GamePacket::ClientboundLoginPacket(p) => {
println!("Got login packet {:?}", p);
state.lock().await.player.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(),
);
tx.send(Event::Login).unwrap();
}
@ -221,6 +230,7 @@ impl Client {
GamePacket::ClientboundAddMobPacket(p) => {
println!("Got add mob packet {:?}", p);
}
GamePacket::ServerboundCustomPayloadPacket(_) => todo!(),
}
println!();
}

109
azalea-protocol/packet-macros/src/lib.rs
View file

@ -3,13 +3,10 @@ use quote::{quote, ToTokens};
use syn::{
self, braced,
parse::{Parse, ParseStream, Result},
parse_macro_input, DeriveInput, FieldsNamed, Ident, LitInt, Token,
parse_macro_input, Data, DeriveInput, FieldsNamed, Ident, LitInt, Token,
};
#[proc_macro_derive(McBufReadable, attributes(varint))]
pub fn derive_mcbufreadable(input: TokenStream) -> TokenStream {
let DeriveInput { ident, data, .. } = parse_macro_input!(input);
fn create_impl_mcbufreadable(ident: &Ident, data: &Data) -> proc_macro2::TokenStream {
let fields = match data {
syn::Data::Struct(syn::DataStruct { fields, .. }) => fields,
_ => panic!("#[derive(*Packet)] can only be used on structs"),
@ -50,7 +47,6 @@ pub fn derive_mcbufreadable(input: TokenStream) -> TokenStream {
quote! {
#[async_trait::async_trait]
impl crate::mc_buf::McBufReadable for #ident {
async fn read_into<R>(buf: &mut R) -> Result<Self, String>
where
@ -63,13 +59,9 @@ pub fn derive_mcbufreadable(input: TokenStream) -> TokenStream {
}
}
}
.into()
}
#[proc_macro_derive(McBufWritable, attributes(varint))]
pub fn derive_mcbufwritable(input: TokenStream) -> TokenStream {
let DeriveInput { ident, data, .. } = parse_macro_input!(input);
fn create_impl_mcbufwritable(ident: &Ident, data: &Data) -> proc_macro2::TokenStream {
let fields = match data {
syn::Data::Struct(syn::DataStruct { fields, .. }) => fields,
_ => panic!("#[derive(*Packet)] can only be used on structs"),
@ -115,13 +107,26 @@ pub fn derive_mcbufwritable(input: TokenStream) -> TokenStream {
}
}
}
.into()
}
#[proc_macro_derive(McBufReadable, attributes(varint))]
pub fn derive_mcbufreadable(input: TokenStream) -> TokenStream {
let DeriveInput { ident, data, .. } = parse_macro_input!(input);
create_impl_mcbufreadable(&ident, &data).into()
}
#[proc_macro_derive(McBufWritable, attributes(varint))]
pub fn derive_mcbufwritable(input: TokenStream) -> TokenStream {
let DeriveInput { ident, data, .. } = parse_macro_input!(input);
create_impl_mcbufwritable(&ident, &data).into()
}
fn as_packet_derive(input: TokenStream, state: proc_macro2::TokenStream) -> TokenStream {
let DeriveInput { ident, data, .. } = parse_macro_input!(input);
let fields = match data {
let fields = match &data {
syn::Data::Struct(syn::DataStruct { fields, .. }) => fields,
_ => panic!("#[derive(*Packet)] can only be used on structs"),
};
@ -130,85 +135,33 @@ fn as_packet_derive(input: TokenStream, state: proc_macro2::TokenStream) -> Toke
_ => panic!("#[derive(*Packet)] can only be used on structs with named fields"),
};
let write_fields = named
.iter()
.map(|f| {
let field_name = &f.ident;
let field_type = &f.ty;
// do a different buf.write_* for each field depending on the type
// if it's a string, use buf.write_string
match field_type {
syn::Type::Path(_) => {
if f.attrs.iter().any(|attr| attr.path.is_ident("varint")) {
quote! {
crate::mc_buf::McBufVarintWritable::varint_write_into(&self.#field_name, buf)?;
}
} else {
quote! {
crate::mc_buf::McBufWritable::write_into(&self.#field_name, buf)?;
}
}
}
_ => panic!(
"Error writing field {}: {}",
field_name.clone().unwrap(),
field_type.to_token_stream()
),
}
})
.collect::<Vec<_>>();
let mcbufreadable_impl = create_impl_mcbufreadable(&ident, &data);
let mcbufwritable_impl = create_impl_mcbufwritable(&ident, &data);
let read_fields = named
.iter()
.map(|f| {
let field_name = &f.ident;
let field_type = &f.ty;
// do a different buf.write_* for each field depending on the type
// if it's a string, use buf.write_string
match field_type {
syn::Type::Path(_) => {
if f.attrs.iter().any(|a| a.path.is_ident("varint")) {
quote! {
let #field_name = crate::mc_buf::McBufVarintReadable::varint_read_into(buf).await?;
}
} else {
quote! {
let #field_name = crate::mc_buf::McBufReadable::read_into(buf).await?;
}
}
}
_ => panic!(
"Error reading field {}: {}",
field_name.clone().unwrap(),
field_type.to_token_stream()
),
}
})
.collect::<Vec<_>>();
let read_field_names = named.iter().map(|f| &f.ident).collect::<Vec<_>>();
quote! {
let contents = quote! {
impl #ident {
pub fn get(self) -> #state {
#state::#ident(self)
}
pub fn write(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
#(#write_fields)*
Ok(())
crate::mc_buf::McBufWritable::write_into(self, buf)
}
pub async fn read<T: tokio::io::AsyncRead + std::marker::Unpin + std::marker::Send>(
buf: &mut T,
) -> Result<#state, String> {
#(#read_fields)*
Ok(#ident {
#(#read_field_names: #read_field_names),*
}.get())
use crate::mc_buf::McBufReadable;
Ok(Self::read_into(buf).await?.get())
}
}
}
.into()
#mcbufreadable_impl
#mcbufwritable_impl
};
contents.into()
}
#[proc_macro_derive(GamePacket, attributes(varint))]

6
azalea-protocol/src/mc_buf/mod.rs
View file

@ -32,6 +32,12 @@ impl From<Vec<u8>> for UnsizedByteArray {
}
}
impl From<&str> for UnsizedByteArray {
fn from(s: &str) -> Self {
Self(s.as_bytes().to_vec())
}
}
/// Represents Java's BitSet, a list of bits.
#[derive(Debug, Clone, PartialEq, Eq, Hash, McBufReadable, McBufWritable)]
pub struct BitSet {

5
azalea-protocol/src/packets/game/mod.rs
View file

@ -16,12 +16,15 @@ pub mod clientbound_set_chunk_cache_center;
pub mod clientbound_update_recipes_packet;
pub mod clientbound_update_tags_packet;
pub mod clientbound_update_view_distance_packet;
pub mod serverbound_custom_payload_packet;
use packet_macros::declare_state_packets;
declare_state_packets!(
GamePacket,
Serverbound => {},
Serverbound => {
0x0a: serverbound_custom_payload_packet::ServerboundCustomPayloadPacket,
},
Clientbound => {
0x02: clientbound_add_mob_packet::ClientboundAddMobPacket,
0x0e: clientbound_change_difficulty_packet::ClientboundChangeDifficultyPacket,

11
azalea-protocol/src/packets/game/serverbound_custom_payload_packet.rs Normal file
View file

@ -0,0 +1,11 @@
// i don't know the actual name of this packet, i couldn't find it in the source code
use crate::mc_buf::UnsizedByteArray;
use azalea_core::resource_location::ResourceLocation;
use packet_macros::GamePacket;
#[derive(Clone, Debug, GamePacket)]
pub struct ServerboundCustomPayloadPacket {
pub identifier: ResourceLocation,
pub data: UnsizedByteArray,
}