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use axum::{
extract::State,
response::{
self,
sse::{self, Sse},
IntoResponse,
},
};
use axum_extra::extract::Query;
use futures::stream::{Stream, StreamExt as _};
use crate::{
app::App,
error::{Internal, Unauthorized},
event::{app, extract::LastEventId, Event, Sequence, Sequenced as _},
token::{app::ValidateError, extract::Identity},
};
pub async fn handler(
State(app): State<App>,
identity: Identity,
last_event_id: Option<LastEventId<Sequence>>,
Query(query): Query<QueryParams>,
) -> Result<Response<impl Stream<Item = Event> + std::fmt::Debug>, Error> {
let resume_at = last_event_id.map_or(query.resume_point, LastEventId::into_inner);
let stream = app.events().subscribe(resume_at).await?;
let stream = app.tokens().limit_stream(identity.token, stream).await?;
Ok(Response(stream))
}
#[derive(serde::Deserialize)]
pub struct QueryParams {
pub resume_point: Sequence,
}
#[derive(Debug)]
pub struct Response<S>(pub S);
impl<S> IntoResponse for Response<S>
where
S: Stream<Item = Event> + Send + 'static,
{
fn into_response(self) -> response::Response {
let Self(stream) = self;
let stream = stream.map(sse::Event::try_from);
Sse::new(stream)
.keep_alive(sse::KeepAlive::default())
.into_response()
}
}
impl TryFrom<Event> for sse::Event {
type Error = serde_json::Error;
fn try_from(event: Event) -> Result<Self, Self::Error> {
let id = serde_json::to_string(&event.sequence())?;
let data = serde_json::to_string_pretty(&event)?;
let event = Self::default().id(id).data(data);
Ok(event)
}
}
#[derive(Debug, thiserror::Error)]
#[error(transparent)]
pub enum Error {
Subscribe(#[from] app::Error),
Validate(#[from] ValidateError),
}
impl IntoResponse for Error {
fn into_response(self) -> response::Response {
match self {
Self::Validate(ValidateError::InvalidToken) => Unauthorized.into_response(),
other => Internal::from(other).into_response(),
}
}
}
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