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use std::{convert::Infallible, env, net::SocketAddr, time::Duration};
use axum::{
extract::{ws::{Message, WebSocket, WebSocketUpgrade}, State},
http::Method,
response::IntoResponse,
routing::{get, post},
Json, Router,
};
use axum::response::sse::{Event, KeepAlive, Sse};
use serde::{Deserialize, Serialize};
use tower_http::{cors::{Any, CorsLayer}, trace::TraceLayer};
use tracing::info;
use tracing_subscriber::EnvFilter;
use tokio_stream::{wrappers::IntervalStream, StreamExt as _};
use futures::StreamExt as _; // for websocket split/next
use futures::stream::Stream; // for SSE return type
#[derive(Clone, Default)]
struct AppState {}
#[derive(Serialize)]
struct HealthResponse {
status: &'static str,
}
#[derive(Serialize)]
struct HelloResponse {
message: &'static str,
}
#[derive(Deserialize, Serialize)]
struct EchoPayload {
#[serde(flatten)]
rest: serde_json::Value,
}
#[tokio::main]
async fn main() {
// Logging setup
let filter = EnvFilter::try_from_default_env()
.unwrap_or_else(|_| EnvFilter::new("info,tower_http=info,axum::rejection=trace"));
tracing_subscriber::fmt()
.with_env_filter(filter)
.with_target(false)
.compact()
.init();
// Shared app state (extend as needed)
let state = AppState::default();
// CORS to allow local frontend dev at 5173 and others
let cors = CorsLayer::new()
.allow_origin(Any)
.allow_methods([Method::GET, Method::POST, Method::OPTIONS])
.allow_headers(Any);
// Router
let app = Router::new()
.route("/", get(root))
.route("/health", get(health))
.route("/api/hello", get(hello))
.route("/api/echo", post(echo))
.route("/api/stream/transcript", get(stream_transcript_sse))
.route("/ws", get(ws_handler))
.with_state(state)
.layer(cors)
.layer(TraceLayer::new_for_http());
// Bind address
let port = env::var("PORT").ok().and_then(|p| p.parse().ok()).unwrap_or(8080);
let addr = SocketAddr::from(([0, 0, 0, 0], port));
info!(%addr, "starting soryu backend");
let listener = tokio::net::TcpListener::bind(addr).await.expect("bind port");
axum::serve(listener, app).await.expect("server error");
}
async fn root() -> impl IntoResponse {
Json(serde_json::json!({
"service": "soryu-backend",
"endpoints": [
"/health",
"/api/hello",
"/api/echo",
"/api/stream/transcript",
"/ws"
],
}))
}
async fn health() -> impl IntoResponse {
Json(HealthResponse { status: "ok" })
}
async fn hello(State(_state): State<AppState>) -> impl IntoResponse {
Json(HelloResponse { message: "Hello from Soryu backend" })
}
async fn echo(Json(body): Json<serde_json::Value>) -> impl IntoResponse {
Json(EchoPayload { rest: body })
}
// ---
// Streaming transcript (SSE) skeleton
// Provides a low-latency server-sent events stream that emits example
// transcript chunks every ~250ms.
async fn stream_transcript_sse(State(_state): State<AppState>) -> Sse<impl Stream<Item = Result<Event, Infallible>>> {
const SAMPLE_LINES: &[&str] = &[
"speaker_a: hey there, can you hear me?",
"speaker_b: loud and clear — let's begin.",
"speaker_a: streaming transcript looks smooth so far.",
"speaker_b: agreed, latency feels low.",
"speaker_a: wrapping up the demo now.",
];
let mut idx = 0usize;
let interval = tokio::time::interval(Duration::from_millis(250));
let stream = IntervalStream::new(interval).map(move |_| {
let line = SAMPLE_LINES[idx % SAMPLE_LINES.len()];
idx += 1;
let data = serde_json::json!({
"type": "transcript_chunk",
"text": line,
"ts_ms": chrono::Utc::now().timestamp_millis(),
});
Ok(Event::default().json_data(&data).unwrap())
});
Sse::new(stream).keep_alive(KeepAlive::new().interval(Duration::from_secs(10)))
}
// ---
// WebSocket transcript stream skeleton
// Sends example transcript messages on connect; ignores inbound messages.
async fn ws_handler(ws: WebSocketUpgrade, State(_state): State<AppState>) -> impl IntoResponse {
ws.on_upgrade(handle_socket)
}
async fn handle_socket(mut socket: WebSocket) {
const SAMPLE_LINES: &[&str] = &[
"speaker_a: hey there, can you hear me?",
"speaker_b: loud and clear — let's begin.",
"speaker_a: streaming transcript looks smooth so far.",
"speaker_b: agreed, latency feels low.",
"speaker_a: wrapping up the demo now.",
];
// Spawn a task to drain inbound messages (optional for skeleton)
let mut recv_socket = socket.split().1;
tokio::spawn(async move {
while let Some(Ok(_msg)) = recv_socket.next().await {
// Ignore inbound for skeleton; handle pings/acks here if needed
}
});
// Send a small transcript stream
for line in SAMPLE_LINES {
let payload = serde_json::json!({
"type": "transcript_chunk",
"text": line,
"ts_ms": chrono::Utc::now().timestamp_millis(),
})
.to_string();
if socket.send(Message::Text(payload)).await.is_err() {
return;
}
tokio::time::sleep(Duration::from_millis(250)).await;
}
let done = serde_json::json!({"type":"done"}).to_string();
let _ = socket.send(Message::Text(done)).await;
}
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