appcore-capabilities 1.0.0

Capability registry and resolver contracts for distributed AppCore.
Documentation 
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// =============================================================================
//        #######
//     ###       ###     F: peer_rpc_invoker.rs
//    ##   ## ##   ##    P: AppCore-Runtime
//         ## ##
//                       C: 2026/07/22 15:41:18 by dnettoRaw
//    ##   ## ##   ##    U: 2026/07/22 15:41:18 by dnettoRaw
//      ###########      S: 1.0.1-rc.8
// =============================================================================

use crate::{
    CapabilityError, CapabilityRequest, CapabilityResponse, CapabilityResult,
    RemoteCapabilityInvoker,
};
use appcore_core::CapabilityMode;
use appcore_distributed_contracts::{
    PeerRecord, PeerRpcCallKind, PeerRpcClientExecutor, PeerRpcOutboundRequest,
};

/// Remote capability invoker backed by the stable peer RPC client contract.
pub struct PeerRpcRemoteCapabilityInvoker<C> {
    client: C,
}

impl<C> PeerRpcRemoteCapabilityInvoker<C> {
    /// Creates an invoker using the supplied peer RPC executor.
    pub fn new(client: C) -> Self {
        Self { client }
    }
}

impl<C> RemoteCapabilityInvoker for PeerRpcRemoteCapabilityInvoker<C>
where
    C: PeerRpcClientExecutor,
{
    fn invoke_remote(
        &self,
        peer: &PeerRecord,
        request: &CapabilityRequest,
    ) -> CapabilityResult<CapabilityResponse> {
        let endpoint_url = peer_rpc_endpoint(peer).ok_or_else(|| {
            CapabilityError::RemoteEndpointUnavailable(request.capability.clone())
        })?;
        let kind = match request.mode {
            CapabilityMode::Query => PeerRpcCallKind::Query,
            CapabilityMode::Command => PeerRpcCallKind::Command,
            CapabilityMode::Stream => {
                return Err(CapabilityError::HandlerRejected(
                    "stream_remote_invocation_not_supported".to_string(),
                ));
            }
        };
        let response = self
            .client
            .call_peer(
                endpoint_url,
                kind,
                PeerRpcOutboundRequest::new(
                    request.request_id.clone(),
                    peer.identity.core_id.clone(),
                    request.capability.clone(),
                    request.payload.clone(),
                    request.idempotency_key.clone(),
                    request.trace.clone(),
                ),
            )
            .map_err(|error| CapabilityError::RemoteInvocationFailed(format!("{error:?}")))?;
        if response.ok {
            return Ok(CapabilityResponse::accepted(
                response.payload,
                Some(peer.identity.core_id.clone()),
            ));
        }
        Ok(CapabilityResponse::rejected(
            response
                .error
                .unwrap_or_else(|| "remote_rejected".to_string()),
        ))
    }
}

fn peer_rpc_endpoint(peer: &PeerRecord) -> Option<&str> {
    peer.endpoints
        .iter()
        .find(|endpoint| {
            endpoint.name == "peer-rpc"
                || endpoint.name == "peer_rpc"
                || endpoint.protocol == "appcore-peer-rpc"
        })
        .map(|endpoint| endpoint.url.as_str())
}