moves code into the api layer
This commit is contained in:
283
api/src/client/mod.rs
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283
api/src/client/mod.rs
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@@ -0,0 +1,283 @@
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pub mod error;
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use crate::client::error::{MessageError, RequestError};
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use crate::messages::payload::ResponseMessagePayload;
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use crate::messages::{ClientMessage, RequestMessage, RequestResponse, ResponseMessage};
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use error::ConnectError;
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use futures_util::stream::StreamExt;
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use futures_util::SinkExt;
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use log::{debug, error};
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use std::collections::HashMap;
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use std::sync::mpsc::sync_channel;
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use std::sync::Arc;
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use std::thread;
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use tokio::net::TcpStream;
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use tokio::select;
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use tokio::sync::mpsc::{Receiver, Sender};
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use tokio::sync::{mpsc, oneshot, RwLock, RwLockWriteGuard};
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use tokio_tungstenite::tungstenite::client::IntoClientRequest;
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use tokio_tungstenite::tungstenite::handshake::client::Request;
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use tokio_tungstenite::tungstenite::Message;
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use tokio_tungstenite::{connect_async, MaybeTlsStream, WebSocketStream};
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use tokio_util::sync::CancellationToken;
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use uuid::Uuid;
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enum Callback {
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None,
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Once(oneshot::Sender<ResponseMessage>),
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}
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struct OutgoingMessage {
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msg: RequestMessage,
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callback: Callback,
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}
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pub struct Client {
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cancel: CancellationToken,
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channel: Arc<RwLock<Sender<OutgoingMessage>>>,
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}
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struct ClientContext {
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cancel: CancellationToken,
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request: Request,
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}
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impl Client {
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pub fn connect<R>(request: R) -> Result<Self, ConnectError>
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where
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R: IntoClientRequest,
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{
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let (tx, _rx) = mpsc::channel(1);
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let cancel = CancellationToken::new();
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let channel = Arc::new(RwLock::new(tx));
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let context = ClientContext {
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cancel: cancel.clone(),
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request: request.into_client_request()?,
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};
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context.start(channel.clone())?;
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Ok(Self { cancel, channel })
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}
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pub async fn send_message<M: ClientMessage>(&self, msg: M) -> Result<(), MessageError> {
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let sender = self.channel.read().await;
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let data = sender.reserve().await?;
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data.send(OutgoingMessage {
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msg: RequestMessage {
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uuid: Uuid::new_v4(),
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response: None,
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payload: msg.into(),
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},
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callback: Callback::None,
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});
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Ok(())
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}
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pub async fn send_message_if_connected<M: ClientMessage>(
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&self,
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msg: M,
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) -> Result<(), MessageError> {
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let sender = self.channel.try_read()?;
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let data = sender.reserve().await?;
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data.send(OutgoingMessage {
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msg: RequestMessage {
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uuid: Uuid::new_v4(),
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response: None,
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payload: msg.into(),
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},
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callback: Callback::None,
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});
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Ok(())
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}
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pub fn try_send_message<M: ClientMessage>(&self, msg: M) -> Result<(), MessageError> {
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let sender = self.channel.try_read()?;
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let data = sender.try_reserve()?;
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data.send(OutgoingMessage {
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msg: RequestMessage {
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uuid: Uuid::new_v4(),
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response: None,
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payload: msg.into(),
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},
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callback: Callback::None,
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});
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Ok(())
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}
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pub async fn send_request<M: RequestResponse>(
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&self,
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msg: M,
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) -> Result<M::Response, RequestError<<M::Response as TryFrom<ResponseMessagePayload>>::Error>>
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{
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let sender = self.channel.read().await;
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let data = sender.reserve().await?;
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let (tx, rx) = oneshot::channel();
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data.send(OutgoingMessage {
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msg: RequestMessage {
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uuid: Uuid::new_v4(),
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response: None,
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payload: msg.into(),
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},
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callback: Callback::Once(tx),
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});
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let response = rx.await?;
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let response = M::Response::try_from(response.payload).map_err(RequestError::Inner)?;
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Ok(response)
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}
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}
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impl ClientContext {
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fn start(mut self, channel: Arc<RwLock<Sender<OutgoingMessage>>>) -> Result<(), ConnectError> {
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let runtime = tokio::runtime::Builder::new_current_thread()
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.enable_all()
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.build()?;
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let (tx, rx) = sync_channel::<()>(1);
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let _detached = thread::Builder::new()
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.name("tlm-client".to_string())
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.spawn(move || {
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runtime.block_on(async {
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let mut write_lock = channel.write().await;
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// This cannot fail
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let _ = tx.send(());
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while !self.cancel.is_cancelled() {
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write_lock = self.run_connection(write_lock, &channel).await;
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}
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drop(write_lock);
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});
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})?;
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// This cannot fail
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let _ = rx.recv();
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Ok(())
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}
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async fn run_connection<'a>(
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&mut self,
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mut write_lock: RwLockWriteGuard<'a, Sender<OutgoingMessage>>,
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channel: &'a Arc<RwLock<Sender<OutgoingMessage>>>,
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) -> RwLockWriteGuard<'a, Sender<OutgoingMessage>> {
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let mut ws = match connect_async(self.request.clone()).await {
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Ok((ws, _)) => ws,
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Err(e) => {
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error!("Connect Error: {e}");
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return write_lock;
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}
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};
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let (tx, rx) = mpsc::channel(128);
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*write_lock = tx;
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drop(write_lock);
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let close_connection = self.handle_connection(&mut ws, rx).await;
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let write_lock = channel.write().await;
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if close_connection {
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if let Err(e) = ws.close(None).await {
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println!("Close Error {e}");
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}
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}
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write_lock
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}
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async fn handle_connection(
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&mut self,
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ws: &mut WebSocketStream<MaybeTlsStream<TcpStream>>,
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mut rx: Receiver<OutgoingMessage>,
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) -> bool {
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let mut callbacks = HashMap::<Uuid, Callback>::new();
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loop {
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select! {
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_ = self.cancel.cancelled() => { break; },
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Some(msg) = ws.next() => {
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match msg {
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Ok(msg) => {
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match msg {
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Message::Text(msg) => {
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let msg: ResponseMessage = match serde_json::from_str(&msg) {
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Ok(m) => m,
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Err(e) => {
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error!("Failed to deserialize {e}");
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break;
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}
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};
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self.handle_incoming(msg, &mut callbacks).await;
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}
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Message::Binary(_) => unimplemented!("Binary Data Not Implemented"),
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Message::Ping(data) => {
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if let Err(e) = ws.send(Message::Pong(data)).await {
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error!("Failed to send Pong {e}");
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break;
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}
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}
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Message::Pong(_) => {
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// Intentionally Left Empty
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}
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Message::Close(_) => {
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debug!("Websocket Closed");
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return false;
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}
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Message::Frame(_) => unreachable!("Not Possible"),
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}
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}
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Err(e) => {
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error!("Receive Error {e}");
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break;
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}
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}
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}
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Some(msg) = rx.recv() => {
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callbacks.insert(msg.msg.uuid, msg.callback);
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let msg = match serde_json::to_string(&msg.msg) {
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Ok(m) => m,
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Err(e) => {
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error!("Encode Error {e}");
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break;
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}
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};
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if let Err(e) = ws.send(Message::Text(msg.into())).await {
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error!("Send Error {e}");
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break;
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}
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}
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else => { break; },
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}
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}
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true
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}
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async fn handle_incoming(
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&mut self,
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msg: ResponseMessage,
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callbacks: &mut HashMap<Uuid, Callback>,
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) {
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if let Some(response_uuid) = msg.response {
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match callbacks.get(&response_uuid) {
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Some(Callback::Once(_)) => {
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let Some(Callback::Once(callback)) = callbacks.remove(&response_uuid) else {
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return;
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};
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let _ = callback.send(msg);
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}
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Some(Callback::None) => {
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callbacks.remove(&response_uuid);
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}
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None => {}
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}
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}
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}
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}
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impl Drop for Client {
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fn drop(&mut self) {
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self.cancel.cancel();
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}
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}
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