leptos_ws 0.9.5

#![doc = include_str!("../README.md")]
#![warn(clippy::pedantic)]
#![warn(clippy::nursery)]

// #![feature(unboxed_closures)]
use crate::messages::ServerSignalMessage;
#[cfg(any(feature = "csr", feature = "hydrate", feature = "ssr"))]
pub use bidirectional::BiDirectionalSignal;
#[cfg(any(feature = "csr", feature = "hydrate", feature = "ssr"))]
pub use channel::ChannelSignal;
use leptos::{
    prelude::*,
    server_fn::{BoxedStream, Websocket, codec::JsonEncoding},
    task::spawn_local,
};
use messages::{BiDirectionalMessage, ChannelMessage, Messages};
#[cfg(any(feature = "csr", feature = "hydrate", feature = "ssr"))]
pub use read_only::ReadOnlySignal;

use std::sync::{Arc, Mutex};
pub use ws_signals::WsSignals;
mod bidirectional;
mod channel;
pub mod error;
pub mod messages;
mod read_only;
mod ws_signals;

pub mod traits;

#[cfg(any(feature = "csr", feature = "hydrate"))]
#[derive(Clone)]
pub struct ServerSignalWebSocket {
    send: Arc<Mutex<Sender<Result<Messages, ServerFnError>>>>,
    delayed_msgs: Arc<Mutex<Vec<Messages>>>,
    on_disconnect: Arc<Mutex<Option<Box<dyn Fn() + Send + Sync>>>>,
}
#[cfg(any(feature = "csr", feature = "hydrate"))]
impl ServerSignalWebSocket {
    pub fn send(&self, msg: &Messages) -> Result<(), serde_json::Error> {
        // Try to send the message immediately. If the send fails (channel closed or full),
        // push it onto the delayed queue to be flushed when a reconnect succeeds.
        let cloned = msg.to_owned();
        if let Ok(mut lock) = self.send.lock() {
            if lock.try_send(Ok(cloned)).is_err() {
                // queue for later
                if let Ok(mut delayed) = self.delayed_msgs.lock() {
                    delayed.push(msg.to_owned());
                }
            }
        } else {
            // couldn't lock send - queue the message
            if let Ok(mut delayed) = self.delayed_msgs.lock() {
                delayed.push(msg.to_owned());
            }
        }
        Ok(())
    }
    pub fn new() -> Self {
        let (initial_tx, _initial_rx) = mpsc::channel(0);

        let delayed_msgs: Arc<Mutex<Vec<Messages>>> = Arc::new(Mutex::new(Vec::new()));
        let send = Arc::new(Mutex::new(initial_tx));
        let state_signals = WsSignals::new();
        let id = Arc::new(String::new());
        let on_disconnect = Arc::new(Mutex::new(None::<Box<dyn Fn() + Send + Sync + 'static>>));

        {
            let on_disconnect = on_disconnect.clone();
            let mut state_signals = state_signals.clone();
            let delayed_msgs = delayed_msgs.clone();
            let send_arc = send.clone();
            spawn_local(async move {
                use std::time::Duration;
                loop {
                    // create a fresh channel for this connection attempt
                    let (tx, rx) = mpsc::channel(32);

                    // swap in the new sender so callers will use it
                    if let Ok(mut guard) = send_arc.lock() {
                        *guard = tx.clone();
                    }

                    match leptos_ws_websocket(rx.into()).await {
                        Ok(mut messages) => {
                            // flush any delayed messages onto the new sender
                            if let Ok(mut delayed) = delayed_msgs.lock() {
                                for msg in delayed.drain(..) {
                                    // ignore errors here; if it fails, re-queue below on next loop
                                    let _ = tx.clone().try_send(Ok(msg));
                                }
                            }

                            // Re-establish all known registrations (signals/channels) so the server
                            // will start sending updates again after reconnect.
                            for message in state_signals.get_reconnect_messages() {
                                let _ = tx.clone().try_send(Ok(message));
                            }
                            while let Some(msg) = messages.next().await {
                                let Ok(msg) = msg else {
                                    leptos::logging::error!(
                                        "{}",
                                        msg.expect_err("Exepcting Error because of else unwrap")
                                    );
                                    continue;
                                };
                                match msg {
                                    Messages::ServerSignal(server_msg) => match server_msg {
                                        ServerSignalMessage::Establish(_) => {
                                            // Usually client-to-server message, ignore if received
                                        }
                                        ServerSignalMessage::EstablishResponse((name, value)) => {
                                            state_signals.set_json(&name, value.to_owned());
                                        }
                                        ServerSignalMessage::Update(update) => {
                                            spawn_local({
                                                let state_signals = state_signals.clone();
                                                async move {
                                                    state_signals
                                                        .update(
                                                            update.get_name(),
                                                            update.to_owned(),
                                                            None,
                                                        )
                                                        .await;
                                                }
                                            });
                                        }
                                        ServerSignalMessage::Delete(name) => {
                                            state_signals.delete_signal(&name);
                                        }
                                    },
                                    Messages::BiDirectional(bidirectional) => match bidirectional {
                                        BiDirectionalMessage::Establish(_) => {
                                            // Usually client-to-server message, ignore if received
                                        }
                                        BiDirectionalMessage::EstablishResponse((name, value)) => {
                                            state_signals.set_json(&name, value.to_owned());
                                            let recv = state_signals.add_observer(&name).unwrap();
                                            spawn_local(handle_broadcasts_client(recv, tx.clone()));
                                        }
                                        BiDirectionalMessage::Update(update) => {
                                            spawn_local({
                                                let state_signals = state_signals.clone();
                                                let id = id.clone();
                                                async move {
                                                    state_signals
                                                        .update(
                                                            update.get_name(),
                                                            update.to_owned(),
                                                            Some(id.to_string()),
                                                        )
                                                        .await;
                                                }
                                            });
                                        }
                                        BiDirectionalMessage::Delete(name) => {
                                            state_signals.delete_signal(&name);
                                        }
                                    },
                                    Messages::Channel(channel) => match channel {
                                        ChannelMessage::Establish(_) => {
                                            // Usually client-to-server message, ignore if received
                                        }
                                        ChannelMessage::EstablishResponse(name) => {
                                            let recv =
                                                state_signals.add_observer_channel(&name).unwrap();
                                            spawn_local(handle_broadcasts_client(recv, tx.clone()));
                                        }
                                        ChannelMessage::Message(name, value) => {
                                            state_signals.handle_message(&name, value);
                                        }
                                        ChannelMessage::Delete(name) => {
                                            state_signals.delete_channel(&name);
                                        }
                                    },
                                }
                            }
                        }
                        Err(e) => leptos::logging::error!("{e}"),
                    }
                    if let Some(ref on_disconnect) = *on_disconnect.lock().unwrap() {
                        on_disconnect();
                    }
                    // connection lost - wait and retry
                    gloo_timers::future::sleep(Duration::from_secs(1)).await;
                }
            });
        }

        let ws_client = Self {
            send,
            delayed_msgs,
            on_disconnect,
        };

        // Provide ClientSignals for Child Components to work
        provide_context(state_signals);

        ws_client
    }

    /// Set a callback to be called when the websocket connection is lost.
    pub fn set_on_disconnect(&self, on_disconnect: impl Fn() + Send + Sync + 'static) {
        *self.on_disconnect.lock().unwrap() = Some(Box::new(on_disconnect));
    }
}

#[cfg(any(feature = "csr", feature = "hydrate"))]
#[inline]
fn provide_websocket_inner() -> Option<()> {
    if let None = use_context::<ServerSignalWebSocket>() {
        provide_context(ServerSignalWebSocket::new());
    }
    Some(())
}
#[server(protocol = Websocket<JsonEncoding, JsonEncoding>,endpoint="leptos_ws_websocket")]
pub async fn leptos_ws_websocket(
    input: BoxedStream<Messages, ServerFnError>,
) -> Result<BoxedStream<Messages, ServerFnError>, ServerFnError> {
    use futures::{SinkExt, StreamExt, channel::mpsc};
    let mut input = input;
    let (mut tx, rx) = mpsc::channel(1);
    let mut server_signals = use_context::<WsSignals>().unwrap();
    let id = Arc::new(nanoid::nanoid!());
    // spawn a task to listen to the input stream of messages coming in over the websocket
    tokio::spawn(async move {
        while let Some(msg) = input.next().await {
            let Ok(msg) = msg else {
                break;
            };
            match msg {
                Messages::ServerSignal(server_msg) => match server_msg {
                    ServerSignalMessage::Establish(name) => {
                        let recv = server_signals.add_observer(&name).unwrap();
                        tx.send(Ok(Messages::ServerSignal(
                            ServerSignalMessage::EstablishResponse((
                                name.clone(),
                                server_signals.json(&name).unwrap().unwrap(),
                            )),
                        )))
                        .await
                        .unwrap();
                        tokio::spawn(handle_broadcasts(id.to_string(), recv, tx.clone()));
                    }
                    _ => leptos::logging::error!("Unexpected server signal message from client"),
                },
                Messages::BiDirectional(bidirectional) => match bidirectional {
                    BiDirectionalMessage::Establish(name) => {
                        let recv = server_signals.add_observer(&name).unwrap();
                        tx.send(Ok(Messages::BiDirectional(
                            BiDirectionalMessage::EstablishResponse((
                                name.clone(),
                                server_signals.json(&name).unwrap().unwrap(),
                            )),
                        )))
                        .await
                        .unwrap();
                        tokio::spawn(handle_broadcasts(id.to_string(), recv, tx.clone()));
                    }
                    BiDirectionalMessage::Update(update) => {
                        server_signals
                            .update(update.get_name(), update.to_owned(), Some(id.to_string()))
                            .await;
                    }
                    _ => leptos::logging::error!("Unexpected bi-directional message from client"),
                },
                Messages::Channel(channel) => match channel {
                    ChannelMessage::Establish(name) => {
                        let recv = server_signals.add_observer_channel(&name).unwrap();
                        tx.send(Ok(Messages::Channel(ChannelMessage::EstablishResponse(
                            name.clone(),
                        ))))
                        .await
                        .unwrap();
                        tokio::spawn(handle_broadcasts(id.to_string(), recv, tx.clone()));
                    }

                    ChannelMessage::Message(name, value) => {
                        server_signals.handle_message(&name, value);
                    }
                    _ => leptos::logging::error!("Unexpected channel message from client"),
                },
            }
        }
    });

    Ok(rx.into())
}
use futures::{
    SinkExt, StreamExt,
    channel::mpsc::{self, Sender},
};

#[cfg(any(feature = "csr", feature = "hydrate"))]
async fn handle_broadcasts_client(
    mut receiver: tokio::sync::broadcast::Receiver<(Option<String>, Messages)>,
    mut sink: Sender<Result<Messages, ServerFnError>>,
) {
    while let Ok(message) = receiver.recv().await {
        if sink.send(Ok(message.1)).await.is_err() {
            break;
        };
    }
}

#[cfg(feature = "ssr")]
async fn handle_broadcasts(
    id: String,
    mut receiver: tokio::sync::broadcast::Receiver<(Option<String>, Messages)>,
    mut sink: Sender<Result<Messages, ServerFnError>>,
) {
    while let Ok(message) = receiver.recv().await {
        if message.0.is_some_and(|v| id == v) {
            continue;
        }
        if sink.send(Ok(message.1)).await.is_err() {
            break;
        };
    }
}

#[cfg(all(feature = "ssr", not(any(feature = "hydrate", feature = "csr"))))]
#[inline]
fn provide_websocket_inner() -> Option<()> {
    None
}
/// Establishes and provides a WebSocket connection for server signals.
///
/// This function sets up a WebSocket connection to the specified URL and provides
/// the necessary context for handling server signals. It's designed to work differently
/// based on whether server-side rendering (SSR) is enabled or the "hydrate" feature is enabled.
///
/// # Returns
///
/// Returns a `Result` which is:
/// - `Some(())` if the connection is successfully established (client-side only).
/// - `None` if running in SSR mode.
///
/// # Features
///
/// - When the "hydrate" feature is enabled (client-side):
///   - Creates a new WebSocket connection.
///   - Sets up message handling for server signals.
///   - Provides context for `ServerSignalWebSocket` and `ClientSignals`.
///
/// - When the "ssr" feature is enabled (server-side):
///   - Returns `None` without establishing a connection.
///
/// # Examples
///
/// ```rust
/// use leptos_ws::provide_websocket;
/// fn setup_websocket() {
///     if let Some(_) = provide_websocket() {
///         println!("WebSocket connection established");
///     } else {
///         println!("Running in SSR mode or connection failed");
///     }
/// }
/// ```
///
/// # Note
///
/// This function should be called in the root component of your Leptos application
/// to ensure the WebSocket connection is available throughout the app.
#[cfg(any(feature = "csr", feature = "hydrate", feature = "ssr"))]
pub fn provide_websocket() -> Option<()> {
    provide_websocket_inner()
}