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use crate::talker::{Talker, TalkerCompatible, WsIncoming};
use anyhow::Error;
use async_trait::async_trait;
use futures::channel::mpsc;
use meio::{
ActionHandler, Actor, Address, InstantAction, InstantActionHandler, LiteTask, StopReceiver,
};
use meio_protocol::{Protocol, ProtocolData};
use std::marker::PhantomData;
use std::time::{Duration, Instant};
use thiserror::Error;
use tokio::net::TcpStream;
use tokio::time::sleep;
use tokio_tungstenite::{connect_async, MaybeTlsStream, WebSocketStream};
#[derive(Debug, Clone)]
pub struct WsSender<T: ProtocolData> {
tx: mpsc::UnboundedSender<T>,
}
impl<T: ProtocolData> WsSender<T> {
pub(crate) fn new(tx: mpsc::UnboundedSender<T>) -> Self {
Self { tx }
}
pub fn send(&self, msg: T) {
if let Err(err) = self.tx.unbounded_send(msg) {
log::error!("Can't send a message to ws outgoing client part: {}", err);
}
}
}
#[derive(Debug)]
pub enum WsClientStatus<P: Protocol> {
Connected { sender: WsSender<P::ToServer> },
Failed { reason: WsFailReason },
}
#[derive(Error, Debug, Clone)]
pub enum WsFailReason {
#[error("closed by server")]
ClosedByServer,
#[error("connection failed")]
ConnectionFailed,
#[error("server not available")]
ServerNotAvailable,
}
impl<P: Protocol> InstantAction for WsClientStatus<P> {}
pub struct WsClient<P, A>
where
A: Actor,
{
url: String,
repeat_interval: Option<Duration>,
address: Address<A>,
_protocol: PhantomData<P>,
}
impl<P, A> WsClient<P, A>
where
P: Protocol,
A: Actor + InstantActionHandler<WsClientStatus<P>> + ActionHandler<WsIncoming<P::ToClient>>,
{
pub fn new(url: String, repeat_interval: Option<Duration>, address: Address<A>) -> Self {
Self {
url,
repeat_interval,
address,
_protocol: PhantomData,
}
}
}
impl<P, A> TalkerCompatible for WsClient<P, A>
where
P: Protocol,
A: Actor + InstantActionHandler<WsClientStatus<P>> + ActionHandler<WsIncoming<P::ToClient>>,
{
type WebSocket = WebSocketStream<MaybeTlsStream<TcpStream>>;
type Message = tungstenite::Message;
type Error = tungstenite::Error;
type Actor = A;
type Codec = P::Codec;
type Incoming = P::ToClient;
type Outgoing = P::ToServer;
}
#[async_trait]
impl<P, A> LiteTask for WsClient<P, A>
where
P: Protocol,
A: Actor + InstantActionHandler<WsClientStatus<P>> + ActionHandler<WsIncoming<P::ToClient>>,
{
type Output = ();
fn name(&self) -> String {
format!("WsClient({})", self.url)
}
async fn routine(mut self, stop: StopReceiver) -> Result<Self::Output, Error> {
self.connection_routine(stop).await
}
}
impl<P, A> WsClient<P, A>
where
P: Protocol,
A: Actor + InstantActionHandler<WsClientStatus<P>> + ActionHandler<WsIncoming<P::ToClient>>,
{
async fn connection_routine(&mut self, mut stop: StopReceiver) -> Result<(), Error> {
while stop.is_alive() {
log::trace!("Ws client conencting to: {}", self.url);
let res = connect_async(&self.url).await;
let mut last_success = Instant::now();
let fail_reason;
let original_err: Error;
match res {
Ok((wss, _resp)) => {
log::debug!("Client connected successfully to: {}", self.url);
last_success = Instant::now();
let (tx, rx) = mpsc::unbounded();
let sender = WsSender { tx };
self.address
.instant(WsClientStatus::<P>::Connected { sender })?;
let mut talker =
Talker::<Self>::new(self.address.clone(), wss, rx, stop.clone());
let res = talker.routine().await;
match res {
Ok(reason) => {
if reason.is_interrupted() {
log::info!("Interrupted by a user");
return Ok(());
} else {
log::error!("Server closed a connection");
fail_reason = WsFailReason::ClosedByServer;
original_err = WsFailReason::ClosedByServer.into();
}
}
Err(err) => {
log::error!("Ws connecion to {} failed: {}", self.url, err);
fail_reason = WsFailReason::ConnectionFailed;
original_err = err;
}
}
}
Err(err) => {
log::error!("Can't connect to {}: {}", self.url, err);
fail_reason = WsFailReason::ServerNotAvailable;
original_err = err.into();
}
}
self.address.instant(WsClientStatus::<P>::Failed {
reason: fail_reason.clone(),
})?;
if let Some(dur) = self.repeat_interval {
let elapsed = last_success.elapsed();
if elapsed < dur {
let remained = dur - elapsed;
stop.or(sleep(remained)).await?;
}
log::debug!("Next attempt to connect to: {}", self.url);
} else {
return Err(original_err);
}
}
Ok(())
}
}