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#![deny(clippy::future_not_send)]
//! Pokémon Showdown client.
//!
//! # Stability
//!
//! This crate is not stable, not even close. The APIs of this crate are
//! heavily experimented on, and there isn't going to be depreciation period for
//! removed features. Don't use this crate if you aren't prepared for constant
//! breakage.
pub mod message;
use self::message::Message;
#[cfg(feature = "__tls")]
use futures_util::future::TryFutureExt;
use futures_util::ready;
use futures_util::sink::Sink;
use futures_util::stream::Stream as FuturesStream;
#[cfg(feature = "__tls")]
use serde::Deserialize;
use std::fmt::{self, Display, Formatter};
use std::pin::Pin;
use std::result::Result as StdResult;
use std::task::{Context, Poll};
use thiserror::Error;
#[cfg(feature = "time")]
pub use time;
use tokio::net::TcpStream;
use tokio_tungstenite::tungstenite::protocol::frame::coding::CloseCode;
use tokio_tungstenite::tungstenite::protocol::CloseFrame;
use tokio_tungstenite::tungstenite::{Error as WsError, Message as OwnedMessage};
use tokio_tungstenite::{MaybeTlsStream, WebSocketStream};
pub use url;
use url::Url;
type SocketStream = WebSocketStream<MaybeTlsStream<TcpStream>>;
/// Message stream.
///
/// # Examples
///
#[cfg_attr(feature = "__tls", doc = "```no_run")]
#[cfg_attr(not(feature = "__tls"), doc = "```compile_fail")]
/// use futures::{SinkExt, StreamExt};
/// use showdown::message::{Kind, UpdateUser};
/// use showdown::{Result, RoomId, Stream};
///
/// #[tokio::main]
/// async fn main() -> Result<()> {
/// let mut stream = Stream::connect("showdown").await?;
/// let message = stream.next().await.unwrap()?;
/// match message.kind() {
/// Kind::UpdateUser(UpdateUser {
/// username,
/// named: false,
/// ..
/// }) => {
/// assert!(username.starts_with(" Guest "));
/// }
/// _ => panic!(),
/// }
/// Ok(())
/// }
/// ```
pub struct Stream {
stream: SocketStream,
}
impl Stream {
/// Connects to a named Showdown server.
///
/// Returns a structure implementing [`Sink`](Sink) and
/// [`Stream`](FuturesStream) traits which can be used to send and
/// receives messages respectively.
///
/// It's possible to use [`StreamExt::split`](futures_util::stream::StreamExt::split)
/// to split returned structure into separate `Sink` and `Stream` objects.
///
/// Requires `native-tls`, `native-tls-vendored` or `rustls-tls` feature.
///
/// # Examples
///
/// ```no_run
/// use showdown::{Result, Stream};
///
/// #[tokio::main]
/// async fn main() {
/// assert!(Stream::connect("showdown").await.is_ok());
/// assert!(Stream::connect("fakestofservers").await.is_err());
/// }
/// ```
#[cfg(feature = "__tls")]
pub async fn connect(name: &str) -> Result<Self> {
Self::connect_to_url(&fetch_server_url(name).await?).await
}
/// Connects to an URL.
///
/// This URL is provided by
#[cfg_attr(feature = "__tls", doc = " [`fetch_server_url`]")]
#[cfg_attr(not(feature = "__tls"), doc = "`fetch_server_url`")]
/// function.
///
/// # Examples
///
#[cfg_attr(feature = "__tls", doc = "```no_run")]
#[cfg_attr(not(feature = "__tls"), doc = "```compile_fail")]
/// use showdown::{fetch_server_url, Result, Stream};
///
/// #[tokio::main]
/// async fn main() -> Result<()> {
/// let url = fetch_server_url("smogtours").await?;
/// assert_eq!(url.as_str(), "ws://sim3.psim.us:8002/showdown/websocket");
/// Stream::connect_to_url(&url).await?;
/// Ok(())
/// }
/// ```
pub async fn connect_to_url(url: &Url) -> Result<Self> {
let stream = Error::from_ws(tokio_tungstenite::connect_async(url).await)?.0;
Ok(Self { stream })
}
}
impl fmt::Debug for Stream {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.debug_struct("Stream").finish()
}
}
impl Sink<SendMessage> for Stream {
type Error = Error;
fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
Pin::new(&mut self.stream)
.poll_ready(cx)
.map(Error::from_ws)
}
fn start_send(mut self: Pin<&mut Self>, item: SendMessage) -> Result<()> {
Error::from_ws(Pin::new(&mut self.stream).start_send(OwnedMessage::Text(item.0)))
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
Pin::new(&mut self.stream)
.poll_flush(cx)
.map(Error::from_ws)
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
Pin::new(&mut self.stream)
.poll_close(cx)
.map(Error::from_ws)
}
}
impl FuturesStream for Stream {
type Item = Result<Message>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
Poll::Ready(loop {
match Error::from_ws(ready!(Pin::new(&mut self.stream).poll_next(cx)).transpose())? {
Some(OwnedMessage::Text(raw)) => break Some(Ok(Message { raw })),
Some(OwnedMessage::Close(Some(CloseFrame {
code: CloseCode::Normal,
..
}))) => {}
Some(message) => break Some(Err(Error(ErrorInner::UnrecognizedMessage(message)))),
None => break None,
}
})
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.stream.size_hint()
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct SendMessage(String);
impl SendMessage {
/// Creates a global command.
///
/// # Example
///
#[cfg_attr(feature = "__tls", doc = "```no_run")]
#[cfg_attr(not(feature = "__tls"), doc = "```compile_fail")]
/// use futures::{SinkExt, StreamExt};
/// use showdown::message::{Kind, QueryResponse};
/// use showdown::{Result, RoomId, SendMessage, Stream};
///
/// #[tokio::main]
/// async fn main() -> Result<()> {
/// let mut stream = Stream::connect("showdown").await?;
/// stream.send(SendMessage::global_command("cmd rooms")).await?;
/// while let Some(received) = stream.next().await {
/// if let Kind::QueryResponse(QueryResponse::Rooms(rooms)) = received?.kind() {
/// assert!(rooms
/// .official
/// .iter()
/// .any(|room| room.title == "Tournaments"));
/// return Ok(());
/// }
/// }
/// panic!("Server didn't provide a list of rooms")
/// }
/// ```
pub fn global_command(command: impl Display) -> Self {
SendMessage(format!("|/{}", command))
}
/// Creates a chat room message.
pub fn chat_message(room_id: RoomId<'_>, message: impl Display) -> Self {
Self::prefixed(room_id, ' ', message)
}
/// Creates a command that executes in a chat room.
///
/// # Examples
///
#[cfg_attr(feature = "__tls", doc = "```no_run")]
#[cfg_attr(not(feature = "__tls"), doc = "```compile_fail")]
/// use futures::{SinkExt, StreamExt};
/// use showdown::message::{Kind, QueryResponse};
/// use showdown::{Result, RoomId, SendMessage, Stream};
///
/// #[tokio::main]
/// async fn main() -> Result<()> {
/// let mut stream = Stream::connect("showdown").await?;
/// stream.send(SendMessage::global_command("join lobby")).await?;
/// stream.send(SendMessage::chat_command(RoomId::LOBBY, "roomdesc")).await;
/// while let Some(message) = stream.next().await {
/// if let Kind::Html(html) = message?.kind() {
/// assert!(html.contains("Relax here amidst the chaos."));
/// return Ok(());
/// }
/// }
/// panic!("Server didn't provide a room description")
/// }
/// ```
pub fn chat_command(room_id: RoomId<'_>, command: impl Display) -> Self {
Self::prefixed(room_id, '/', command)
}
pub fn broadcast_command(room_id: RoomId<'_>, command: impl Display) -> Self {
Self::prefixed(room_id, '!', command)
}
fn prefixed(room_id: RoomId<'_>, prefix: char, message: impl Display) -> Self {
SendMessage(format!("{}|{}{}", room_id.0, prefix, message))
}
}
/// Requires `native-tls`, `native-tls-vendored` or `rustls-tls` feature.
#[cfg(feature = "__tls")]
pub async fn fetch_server_url(name: &str) -> Result<Url> {
let owned_url;
let url = if name == "showdown" {
"wss://sim3.psim.us/showdown/websocket"
} else {
let server_info_url = format!("https://pokemonshowdown.com/servers/{}.json", name);
let Server { host, port } = reqwest::get(&server_info_url)
.and_then(|r| r.json())
.await
.map_err(|e| Error(ErrorInner::Reqwest(e)))?;
let protocol = if port == 443 { "wss" } else { "ws" };
// Concatenation is fine, as it's also done by the official Showdown client
owned_url = format!("{}://{}:{}/showdown/websocket", protocol, host, port);
&owned_url
};
Url::parse(url).map_err(|e| Error(ErrorInner::Url(e)))
}
#[cfg(feature = "__tls")]
#[derive(Deserialize)]
struct Server {
host: String,
port: u16,
}
#[derive(Copy, Clone, Debug)]
pub struct RoomId<'a>(pub &'a str);
impl RoomId<'_> {
pub const LOBBY: RoomId<'static> = RoomId("lobby");
}
pub type Result<T> = StdResult<T, Error>;
/// A specialized `Result` type for Showdown client operations.
#[derive(Debug, Error)]
#[error(transparent)]
pub struct Error(ErrorInner);
impl Error {
fn from_ws<T>(r: StdResult<T, tokio_tungstenite::tungstenite::Error>) -> Result<T> {
r.map_err(|e| Error(ErrorInner::WebSocket(e)))
}
}
#[derive(Debug, Error)]
enum ErrorInner {
#[error("Websocket error")]
WebSocket(#[source] WsError),
#[cfg(feature = "__tls")]
#[error("HTTPS request error")]
Reqwest(#[source] reqwest::Error),
#[cfg(feature = "__tls")]
#[error("Couldn't get a valid server URL")]
Url(#[source] url::ParseError),
#[cfg(feature = "__tls")]
#[error("Couldn't parse login assertion")]
Json(#[source] serde_json::Error),
#[error("Unrecognized message: {0:?}")]
UnrecognizedMessage(OwnedMessage),
}