velaclaw 0.3.0

Protocol-driven autonomous AI agent runtime with intelligent model selection and multi-model negotiation.
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//! Gateway-scoped pending tool approvals (VL-UI-004).
//! 网关侧待审批工具调用队列（VL-UI-004）。

use super::{ApprovalRequest, ApprovalResponse};
use parking_lot::Mutex;
use serde::Serialize;
use std::collections::HashMap;
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::{broadcast, oneshot};
use uuid::Uuid;

const DEFAULT_APPROVAL_TIMEOUT: Duration = Duration::from_secs(300);

/// Event emitted to WebSocket clients when a tool needs user approval.
#[derive(Debug, Clone, Serialize, PartialEq)]
pub struct ApprovalRequiredEvent {
    pub id: String,
    pub tool_name: String,
    pub arguments: serde_json::Value,
    pub arguments_summary: String,
}

struct PendingEntry {
    respond_tx: oneshot::Sender<ApprovalResponse>,
}

/// Shared registry for interactive web approvals.
#[derive(Clone)]
pub struct ApprovalHub {
    pending: Arc<Mutex<HashMap<String, PendingEntry>>>,
    events: broadcast::Sender<ApprovalRequiredEvent>,
}

impl ApprovalHub {
    pub fn new() -> Self {
        let (events, _) = broadcast::channel(32);
        Self {
            pending: Arc::new(Mutex::new(HashMap::new())),
            events,
        }
    }

    pub fn subscribe(&self) -> broadcast::Receiver<ApprovalRequiredEvent> {
        self.events.subscribe()
    }

    /// Register a pending approval and wait for `respond` or timeout.
    pub async fn request(&self, request: &ApprovalRequest, summary: &str) -> ApprovalResponse {
        let id = Uuid::new_v4().to_string();
        let (tx, rx) = oneshot::channel();
        {
            let mut guard = self.pending.lock();
            guard.insert(id.clone(), PendingEntry { respond_tx: tx });
        }

        let event = ApprovalRequiredEvent {
            id: id.clone(),
            tool_name: request.tool_name.clone(),
            arguments: request.arguments.clone(),
            arguments_summary: summary.to_string(),
        };
        let _ = self.events.send(event);

        match tokio::time::timeout(DEFAULT_APPROVAL_TIMEOUT, rx).await {
            Ok(Ok(decision)) => decision,
            _ => {
                self.pending.lock().remove(&id);
                ApprovalResponse::No
            }
        }
    }

    /// Resolve a pending approval from HTTP (`POST /api/approvals/:id/respond`).
    pub fn respond(&self, id: &str, approved: bool, always: bool) -> bool {
        let entry = self.pending.lock().remove(id);
        let Some(entry) = entry else {
            return false;
        };
        let decision = if approved {
            if always {
                ApprovalResponse::Always
            } else {
                ApprovalResponse::Yes
            }
        } else {
            ApprovalResponse::No
        };
        entry.respond_tx.send(decision).is_ok()
    }
}

impl Default for ApprovalHub {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn respond_unblocks_request() {
        let hub = ApprovalHub::new();
        let hub_wait = hub.clone();
        let req = ApprovalRequest {
            tool_name: "shell".into(),
            arguments: serde_json::json!({"command": "ls"}),
        };

        let handle = tokio::spawn(async move { hub_wait.request(&req, "command: ls").await });

        tokio::time::sleep(Duration::from_millis(20)).await;
        let pending: Vec<_> = hub.pending.lock().keys().cloned().collect();
        assert_eq!(pending.len(), 1);
        assert!(hub.respond(&pending[0], true, false));

        let decision = handle.await.expect("join");
        assert_eq!(decision, ApprovalResponse::Yes);
    }
}