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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| // subscription code is not in use yet | ||
| #![allow(dead_code)] | ||
|
|
||
| use std::{collections::HashSet, str::FromStr, time::Duration}; | ||
|
|
||
| use anyhow::{bail, Context, Result}; | ||
| use futures_util::{SinkExt, StreamExt}; | ||
| use http::Uri; | ||
| use snops_common::events::{Event, EventFilter, EventWsRequest}; | ||
| use tokio::{net::TcpStream, select}; | ||
| use tokio_tungstenite::{ | ||
| connect_async, | ||
| tungstenite::{self, client::IntoClientRequest}, | ||
| MaybeTlsStream, WebSocketStream, | ||
| }; | ||
|
|
||
| pub struct EventsClient { | ||
| counter: u32, | ||
| stream: WebSocketStream<MaybeTlsStream<TcpStream>>, | ||
| subscriptions: HashSet<u32>, | ||
| ping_interval: tokio::time::Interval, | ||
| } | ||
|
|
||
| impl EventsClient { | ||
| pub async fn open(url: &str) -> Result<Self> { | ||
| Self::open_with_filter(url, None).await | ||
| } | ||
|
|
||
| pub async fn open_with_filter(url: &str, filter: Option<EventFilter>) -> Result<Self> { | ||
| let (proto, hostname) = url.split_once("://").unwrap_or(("http", url)); | ||
| let proto = match proto { | ||
| "wss" | "https" => "wss", | ||
| _ => "ws", | ||
| }; | ||
|
|
||
| let req = Uri::from_str(&match filter { | ||
| Some(filter) => format!("{proto}://{hostname}/api/v1/events?filter={filter}"), | ||
| None => format!("{proto}://{hostname}/api/v1/events"), | ||
| }) | ||
| .context("Invalid URI")? | ||
| .into_client_request() | ||
| .context("Invalid websocket request")?; | ||
|
|
||
| let stream = match connect_async(req).await { | ||
| Ok((stream, _)) => stream, | ||
| Err(tungstenite::Error::Io(e)) if e.kind() == std::io::ErrorKind::ConnectionRefused => { | ||
| bail!("Failed to connect to websocket: Connection refused") | ||
| } | ||
| Err(e) => bail!("Failed to connect to websocket: {}", e), | ||
| }; | ||
|
|
||
| Ok(Self { | ||
| counter: 0, | ||
| stream, | ||
| subscriptions: Default::default(), | ||
| ping_interval: tokio::time::interval(Duration::from_secs(10)), | ||
| }) | ||
| } | ||
|
|
||
| async fn send_json(&mut self, msg: impl serde::Serialize) -> Result<()> { | ||
| self.stream | ||
| .send(tungstenite::Message::Text( | ||
| serde_json::to_string(&msg).context("Failed to serialize message")?, | ||
| )) | ||
| .await | ||
| .context("Failed to send message") | ||
| } | ||
|
|
||
| /// Add an additional filter to the current subscription | ||
| pub async fn subscribe(&mut self, filter: EventFilter) -> Result<u32> { | ||
| let id = self.counter; | ||
| self.send_json(EventWsRequest::Subscribe { id, filter }) | ||
| .await?; | ||
| self.counter = self.counter.saturating_add(1); | ||
| self.subscriptions.insert(id); | ||
| Ok(id) | ||
| } | ||
|
|
||
| /// Remove a filter from the current subscription | ||
| pub async fn unsubscribe(&mut self, id: u32) -> Result<()> { | ||
| if !self.subscriptions.remove(&id) { | ||
| bail!("Subscription not found: {}", id); | ||
| } | ||
| self.send_json(EventWsRequest::Unsubscribe { id }).await?; | ||
| Ok(()) | ||
| } | ||
|
|
||
| /// Remove all filters from the current subscription | ||
| pub async fn unsubscribe_all(&mut self) -> Result<()> { | ||
| // Collect the ids to avoid borrowing issues | ||
| for id in self.subscriptions.drain().collect::<Vec<_>>() { | ||
| self.send_json(EventWsRequest::Unsubscribe { id }).await?; | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| /// Get the next event from the stream | ||
| pub async fn next(&mut self) -> Result<Event> { | ||
| loop { | ||
| select! { | ||
| _ = self.ping_interval.tick() => { | ||
| self.stream.send(tungstenite::Message::Ping(vec![b'p', b'i', b'n', b'g'])).await.context("Failed to send ping")?; | ||
| } | ||
| msg = self.stream.next() => { | ||
| match msg { | ||
| Some(Ok(tungstenite::Message::Text(text))) => | ||
| return serde_json::from_str(&text).context("Failed to parse event"), | ||
| Some(Ok(tungstenite::Message::Binary(bin))) => | ||
| return serde_json::from_slice(&bin).context("Failed to parse event"), | ||
| None | Some(Err(_)) => bail!("Websocket closed"), | ||
| Some(Ok(_)) => continue, | ||
|
|
||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Close the websocket connection | ||
| pub async fn close(mut self) -> Result<()> { | ||
| self.stream.close(None).await?; | ||
| Ok(()) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| pub mod events; |
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