syntax = "proto3";

// We can't change this to swapserverrpc, it would be a breaking change because
// the package name is also contained in the HTTP URIs and old clients would
// call the wrong endpoints. Luckily with the go_package option we can have
// different golang and RPC package names to fix protobuf namespace conflicts.
package looprpc;

option go_package = "github.com/lightninglabs/loop/swapserverrpc";

service ReservationService {
    // ReservationNotificationStream is a server side stream that sends
    // notifications if the server wants to open a reservation to the client.
    rpc ReservationNotificationStream (ReservationNotificationRequest)
        returns (stream ServerReservationNotification);

    // OpenReservation requests a new reservation UTXO from the server.
    rpc OpenReservation (ServerOpenReservationRequest)
        returns (ServerOpenReservationResponse);
}

// ReservationNotificationRequest is an empty request sent from the client to
// the server to open a stream to receive reservation notifications.
message ReservationNotificationRequest {
}

// ServerReservationNotification is a notification sent from the server to the
// client if the server wants to open a reservation.
message ServerReservationNotification {
    // reservation_id is the id of the reservation.
    bytes reservation_id = 1;

    // value is the value of the reservation in satoshis.
    uint64 value = 2;

    // server_key is the public key of the server.
    bytes server_key = 3;

    // expiry is the absolute expiry of the reservation.
    uint32 expiry = 4;

    // protocol_version is the version of the reservation protocol.
    ReservationProtocolVersion protocol_version = 5;
}

// ServerOpenReservationRequest is a request sent from the client to the server
// to confirm a reservation opening.
message ServerOpenReservationRequest {
    // reservation_id is the id of the reservation.
    bytes reservation_id = 1;

    // client_key is the public key of the client.
    bytes client_key = 2;
}

// ServerOpenReservationResponse is a response sent from the server to the
// client to confirm a reservation opening.
message ServerOpenReservationResponse {
}

// ReservationProtocolVersion is the version of the reservation protocol.
enum ReservationProtocolVersion {
    // RESERVATION_NONE is the default value and means that the reservation
    // protocol version is not set.
    RESERVATION_NONE = 0;

    // RESERVATION_SERVER_REQUEST is the first version of the reservation
    // protocol where the server notifies the client about a reservation.
    RESERVATION_SERVER_NOTIFY = 1;
};