rustvani 0.3.0

Voice AI framework for Rust — real-time speech pipelines with STT, LLM, TTS, and Dhara conversation flows
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use std::collections::HashMap;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use tokio::sync::{watch, Mutex};

// ---------------------------------------------------------------------------
// AgentInfo
// ---------------------------------------------------------------------------

#[derive(Debug, Clone)]
pub struct AgentInfo {
    pub name: String,
    pub runner: String,
    pub parent: Option<String>,
    pub active: bool,
    pub bridged: bool,
    pub started_at: Option<f64>,
}

// ---------------------------------------------------------------------------
// WatchHandler
// ---------------------------------------------------------------------------

type WatchHandler =
    Arc<dyn Fn(AgentInfo) -> Pin<Box<dyn Future<Output = ()> + Send>> + Send + Sync>;

// ---------------------------------------------------------------------------
// AgentRegistry
// ---------------------------------------------------------------------------

pub struct AgentRegistry {
    runner_name: String,
    local: Mutex<HashMap<String, AgentInfo>>,
    remote: Mutex<HashMap<String, AgentInfo>>,
    watches: Mutex<HashMap<String, Vec<WatchHandler>>>,
    /// Per-agent finished signal, set when the agent's `run()` returns.
    /// `watch` (not `Notify`) so a waiter that arrives late still resolves.
    finished: Mutex<HashMap<String, watch::Sender<bool>>>,
}

impl AgentRegistry {
    pub fn new(runner_name: impl Into<String>) -> Arc<Self> {
        Arc::new(Self {
            runner_name: runner_name.into(),
            local: Mutex::new(HashMap::new()),
            remote: Mutex::new(HashMap::new()),
            watches: Mutex::new(HashMap::new()),
            finished: Mutex::new(HashMap::new()),
        })
    }

    pub fn runner_name(&self) -> &str {
        &self.runner_name
    }

    pub async fn local_agents(&self) -> Vec<String> {
        self.local.lock().await.keys().cloned().collect()
    }

    pub async fn remote_agents(&self) -> Vec<String> {
        self.remote.lock().await.keys().cloned().collect()
    }

    pub async fn get(&self, name: &str) -> Option<AgentInfo> {
        if let Some(info) = self.local.lock().await.get(name) {
            return Some(info.clone());
        }
        self.remote.lock().await.get(name).cloned()
    }

    pub async fn watch(&self, agent_name: &str, handler: WatchHandler) {
        let mut watches = self.watches.lock().await;
        watches
            .entry(agent_name.to_string())
            .or_default()
            .push(handler);
        drop(watches);

        if let Some(info) = self.get(agent_name).await {
            let handlers: Vec<WatchHandler> = {
                let w = self.watches.lock().await;
                w.get(agent_name).cloned().unwrap_or_default()
            };
            for h in handlers {
                h(info.clone()).await;
            }
        }
    }

    pub async fn register(&self, info: AgentInfo) -> bool {
        let is_local = info.runner == self.runner_name;
        let mut target = if is_local {
            self.local.lock().await
        } else {
            self.remote.lock().await
        };

        if target.contains_key(&info.name) {
            return false;
        }

        target.insert(info.name.clone(), info.clone());
        drop(target);

        let handlers: Vec<WatchHandler> = {
            let w = self.watches.lock().await;
            w.get(&info.name).cloned().unwrap_or_default()
        };

        for h in handlers {
            h(info.clone()).await;
        }

        true
    }

    pub async fn unregister(&self, name: &str) {
        self.local.lock().await.remove(name);
        self.remote.lock().await.remove(name);
    }

    /// Names of all registered agents (local and remote) whose `parent` is
    /// `name`. Used for End/Cancel cascade.
    pub async fn children_of(&self, name: &str) -> Vec<String> {
        let mut children = Vec::new();
        for map in [&self.local, &self.remote] {
            for info in map.lock().await.values() {
                if info.parent.as_deref() == Some(name) {
                    children.push(info.name.clone());
                }
            }
        }
        children
    }

    /// Signal that `name`'s `run()` has returned. Late waiters still resolve.
    pub async fn mark_finished(&self, name: &str) {
        let mut map = self.finished.lock().await;
        let tx = map
            .entry(name.to_string())
            .or_insert_with(|| watch::channel(false).0);
        let _ = tx.send(true);
    }

    /// Wait until [`AgentRegistry::mark_finished`] has been called for
    /// `name`. Returns immediately if it already was. Callers should wrap
    /// this in a timeout — an agent that never finishes never signals.
    pub async fn wait_finished(&self, name: &str) {
        let mut rx = {
            let mut map = self.finished.lock().await;
            map.entry(name.to_string())
                .or_insert_with(|| watch::channel(false).0)
                .subscribe()
        };
        if *rx.borrow() {
            return;
        }
        while rx.changed().await.is_ok() {
            if *rx.borrow() {
                return;
            }
        }
    }
}