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use std::time::Duration;
use anyhow::Result;
use common::v1::types::{MessageClient, MessageEnvelope, MessagePayload, SessionToken, SyncResume};
use futures_util::{SinkExt, StreamExt};
use reqwest::Url;
use tokio_tungstenite::tungstenite::Message as WsMessage;
use tracing::{error, warn};
use crate::handler::{EmptyHandler, ErasedHandler};
pub struct Syncer {
handler: Box<dyn ErasedHandler>,
token: SessionToken,
base_url: Url,
controller: Option<tokio::sync::mpsc::Receiver<MessageClient>>,
}
const DEFAULT_BASE: &str = "wss://chat.celery.eu.org/";
impl Syncer {
pub fn new(token: SessionToken) -> Self {
let base_url = Url::parse(DEFAULT_BASE).unwrap();
Self {
token,
base_url,
handler: Box::new(EmptyHandler),
controller: None,
}
}
pub fn with_base_url(self, base_url: Url) -> Self {
Self { base_url, ..self }
}
pub fn with_handler(self, handler: Box<dyn ErasedHandler>) -> Self {
Self { handler, ..self }
}
pub fn with_controller(self, events: tokio::sync::mpsc::Receiver<MessageClient>) -> Self {
Self {
controller: Some(events),
..self
}
}
pub async fn connect(&mut self) -> Result<()> {
let mut resume: Option<SyncResume> = None;
loop {
let url = self.base_url.join("/api/v1/sync?version=1")?;
let Ok((mut client, _)) = tokio_tungstenite::connect_async(url.as_str()).await else {
warn!("websocket failed to connect, retrying in 1 second...");
tokio::time::sleep(Duration::from_secs(1)).await;
continue;
};
let hello = MessageClient::Hello {
token: self.token.clone(),
resume: resume.clone(),
status: None,
};
client
.send(WsMessage::text(serde_json::to_string(&hello)?))
.await?;
loop {
if let Some(controller) = &mut self.controller {
tokio::select! {
msg = client.next() => {
if let Some(Ok(msg)) = msg {
let WsMessage::Text(text) = msg else { continue };
let msg: MessageEnvelope = serde_json::from_str(&text)?;
match &msg.payload {
MessagePayload::Ping => {
client
.send(WsMessage::text(serde_json::to_string(
&MessageClient::Pong,
)?))
.await?;
}
MessagePayload::Error { error } => {
error!("{error}");
}
MessagePayload::Ready { conn, seq, .. } => {
resume = Some(SyncResume {
conn: conn.to_string(),
seq: *seq,
});
}
MessagePayload::Reconnect { can_resume } => {
if !can_resume {
resume = None;
}
client.close(None).await?;
}
MessagePayload::Sync { seq, .. } => {
if let Some(resume) = &mut resume {
resume.seq = *seq;
}
}
_ => {}
}
self.handler.handle(msg.payload).await;
} else {
warn!("websocket disconnected, reconnecting in 1 second...");
tokio::time::sleep(Duration::from_secs(1)).await;
break;
}
},
msg = controller.recv() => {
client
.send(WsMessage::text(serde_json::to_string(&msg)?))
.await?;
},
}
} else {
if let Some(Ok(msg)) = client.next().await {
let WsMessage::Text(text) = msg else { continue };
let msg: MessageEnvelope = serde_json::from_str(&text)?;
match &msg.payload {
MessagePayload::Ping => {
client
.send(WsMessage::text(serde_json::to_string(
&MessageClient::Pong,
)?))
.await?;
}
MessagePayload::Error { error } => {
error!("{error}");
}
MessagePayload::Ready { conn, seq, .. } => {
resume = Some(SyncResume {
conn: conn.to_string(),
seq: *seq,
});
}
MessagePayload::Reconnect { can_resume } => {
if !can_resume {
resume = None;
}
client.close(None).await?;
}
MessagePayload::Sync { seq, .. } => {
if let Some(resume) = &mut resume {
resume.seq = *seq;
}
}
_ => {}
}
self.handler.handle(msg.payload).await;
} else {
warn!("websocket disconnected, reconnecting in 1 second...");
tokio::time::sleep(Duration::from_secs(1)).await;
break;
}
}
}
}
}
}