//! Application state holding shared ML models and database pool.
use std::sync::Arc;
use sqlx::PgPool;
use tokio::sync::{broadcast, Mutex};
use uuid::Uuid;
use crate::listen::{DiarizationConfig, ParakeetEOU, ParakeetTDT, Sortformer};
/// Notification payload for file updates (broadcast to WebSocket subscribers).
#[derive(Debug, Clone)]
pub struct FileUpdateNotification {
/// ID of the updated file
pub file_id: Uuid,
/// New version number after update
pub version: i32,
/// List of fields that were updated
pub updated_fields: Vec<String>,
/// Source of the update: "user", "llm", or "system"
pub updated_by: String,
}
/// Shared application state containing ML models and database pool.
///
/// Models are wrapped in `Mutex` for thread-safe mutable access during inference.
pub struct AppState {
/// Speech-to-text model (Parakeet TDT)
pub parakeet: Mutex<ParakeetTDT>,
/// End-of-Utterance detection model for streaming
pub parakeet_eou: Mutex<ParakeetEOU>,
/// Speaker diarization model (Sortformer)
pub sortformer: Mutex<Sortformer>,
/// Optional database connection pool
pub db_pool: Option<PgPool>,
/// Broadcast channel for file update notifications
pub file_updates: broadcast::Sender<FileUpdateNotification>,
}
impl AppState {
/// Load all ML models from the specified directories.
///
/// # Arguments
/// * `parakeet_model_dir` - Path to the Parakeet TDT model directory
/// * `parakeet_eou_dir` - Path to the Parakeet EOU model directory
/// * `sortformer_model_path` - Path to the Sortformer diarization model file
pub fn new(
parakeet_model_dir: &str,
parakeet_eou_dir: &str,
sortformer_model_path: &str,
) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
let parakeet = ParakeetTDT::from_pretrained(parakeet_model_dir, None)?;
let parakeet_eou = ParakeetEOU::from_pretrained(parakeet_eou_dir, None)?;
let sortformer = Sortformer::with_config(
sortformer_model_path,
None,
DiarizationConfig::callhome(),
)?;
// Create broadcast channel with buffer for 256 messages
let (file_updates, _) = broadcast::channel(256);
Ok(Self {
parakeet: Mutex::new(parakeet),
parakeet_eou: Mutex::new(parakeet_eou),
sortformer: Mutex::new(sortformer),
db_pool: None,
file_updates,
})
}
/// Set the database pool.
pub fn with_db_pool(mut self, pool: PgPool) -> Self {
self.db_pool = Some(pool);
self
}
/// Broadcast a file update notification to all subscribers.
///
/// This is a no-op if there are no subscribers (ignores send errors).
pub fn broadcast_file_update(&self, notification: FileUpdateNotification) {
// Ignore send errors - they just mean no one is listening
let _ = self.file_updates.send(notification);
}
}
/// Type alias for the shared application state.
pub type SharedState = Arc<AppState>;
