grpc-router originated as a workaround for missing feature of tower-grpc lib. The library does not support serving of multiple services on a single endpoint, which mayastor project desperately needs, because it needs to serve CSI identity and node services on a single unix domain socket in order to comply with the CSI spec.

Example usage is missing csi module with auto-generated IdentityServer and NodeServer and service implementations Identity and Node. It can't be used on its own but gives an idea how grpc-router should be used:

extern crate grpc_router;

use grpc_router::Router2;

fn create_service() {
    let csi_service = Router2::new(
        "/csi.v1.Identity/",
        csi::server::IdentityServer::new(Identity {}),
        csi::server::NodeServer::new(Node {}),
    );

    let mut csi_server = Server::new(csi_service);
    // Bind csi_server to http2 server and continue as normally
    // ...
}

All requests with /csi.v1.Identity/ prefix in URL will be routed to csi::server::IdentityServer and all other requests to csi::server::NodeServer, which is kind of a default grpc service in this case.