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[fix](trx-frontend-http): keep spectrum SSE alive on idle ticks

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Signed-off-by: Stan Grams <sjg@haxx.space>
Co-authored-by: OpenAI Codex <codex@openai.com>
This commit is contained in:
Stan Grams
2026-02-27 22:56:34 +01:00
parent c23f1a4b4d
commit 5730ce2991
1 changed files with 6 additions and 7 deletions
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src/trx-client/trx-frontend/trx-frontend-http/src/api.rs
+6 -7
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@@ -299,9 +299,9 @@ pub async fn spectrum(
context: web::Data<Arc<FrontendRuntimeContext>>, context: web::Data<Arc<FrontendRuntimeContext>>,
) -> Result<HttpResponse, Error> { ) -> Result<HttpResponse, Error> {
let context_updates = context.get_ref().clone(); let context_updates = context.get_ref().clone();
let updates = IntervalStream::new(time::interval(Duration::from_millis(200))).scan( let mut last_json: Option<String> = None;
None::<String>, let updates =
move |last_json, _| { IntervalStream::new(time::interval(Duration::from_millis(200))).filter_map(move |_| {
let context = context_updates.clone(); let context = context_updates.clone();
std::future::ready({ std::future::ready({
let next_json = context let next_json = context
@@ -313,11 +313,11 @@ pub async fn spectrum(
let payload = match (last_json.as_ref(), next_json) { let payload = match (last_json.as_ref(), next_json) {
(Some(prev), Some(next)) if prev == &next => None, (Some(prev), Some(next)) if prev == &next => None,
(_, Some(next)) => { (_, Some(next)) => {
*last_json = Some(next.clone()); last_json = Some(next.clone());
Some(next) Some(next)
} }
(Some(_), None) => { (Some(_), None) => {
*last_json = None; last_json = None;
Some("null".to_string()) Some("null".to_string())
} }
(None, None) => None, (None, None) => None,
@@ -325,8 +325,7 @@ pub async fn spectrum(
payload.map(|json| Ok::<Bytes, Error>(Bytes::from(format!("data: {json}\n\n")))) payload.map(|json| Ok::<Bytes, Error>(Bytes::from(format!("data: {json}\n\n"))))
}) })
}, });
);
let pings = IntervalStream::new(time::interval(Duration::from_secs(15))) let pings = IntervalStream::new(time::interval(Duration::from_secs(15)))
.map(|_| Ok::<Bytes, Error>(Bytes::from(": ping\n\n"))); .map(|_| Ok::<Bytes, Error>(Bytes::from(": ping\n\n")));