Handling `Adapter` trait from casbin-rs main repo

[0xethsign]

I'm trying to handle the Adapter trait from the main repo. This is a sample function in the golang version of casbin-server (grpc) -

func (s *Server) NewEnforcer(ctx context.Context, in *pb.NewEnforcerRequest) (*pb.NewEnforcerReply, error) {
    var a persist.Adapter
    var e *casbin.Enforcer

    if in.AdapterHandle != -1 {
        var err error
        a, err = s.getAdapter(int(in.AdapterHandle))
        if err != nil {
            return &pb.NewEnforcerReply{Handler: 0}, err
        }
    }

    if in.ModelText == "" {
        cfg := LoadConfiguration("config/connection_config.json")
        data, err := ioutil.ReadFile(cfg.Enforcer)
        if err != nil {
            return &pb.NewEnforcerReply{Handler: 0}, err
        }
        in.ModelText = string(data)
    }

    if a == nil {
        m, err := model.NewModelFromString(in.ModelText)
        if err != nil {
            return &pb.NewEnforcerReply{Handler: 0}, err
        }

        e, err = casbin.NewEnforcer(m)
        if err != nil {
            return &pb.NewEnforcerReply{Handler: 0}, err
        }
    } else {
        m, err := model.NewModelFromString(in.ModelText)
        if err != nil {
            return &pb.NewEnforcerReply{Handler: 0}, err
        }

        e, err = casbin.NewEnforcer(m, a)
        if err != nil {
            return &pb.NewEnforcerReply{Handler: 0}, err
        }
    }
    h := s.addEnforcer(e)

    return &pb.NewEnforcerReply{Handler: int32(h)}, nil
}

I'm trying to implement the same in rust like this -

    async fn new_enforcer(
        &self,
        i: Request<casbin_proto::NewEnforcerRequest>,
    ) -> Result<Response<casbin_proto::NewEnforcerReply>, Status> {
        let a: Option<Box<dyn Adapter>>;
        let e: Enforcer;
        if i.get_mut().adapter_handle != -1 {
            a = match self.get_adapter(i.into_inner().adapter_handle) {
                Ok(v) => Some(Box::new(v)),
                Err(er) => return Ok(Response::new(casbin_proto::NewEnforcerReply { handler: 0 })),
            };
        }
        if i.get_mut().model_text == String::from("") {
            let cfg = adapter::load_configuration("config/connection_config.json").await?;
            let data = match std::fs::read_to_string(cfg.enforcer.as_str()) {
                Ok(v) => v,
                Err(er) => return Ok(Response::new(casbin_proto::NewEnforcerReply { handler: 0 })),
            };
        }
        match a {
            None => {
                let m = DefaultModel::from_str(i.get_mut().model_text.as_str())
                    .await
                    .unwrap();
                let e = casbin::Enforcer::new(m, ()).await.unwrap();
            }
            Some(v) => {
                let m = DefaultModel::from_str(i.get_mut().model_text.as_str())
                    .await
                    .unwrap();
                let e = casbin::Enforcer::new(m, v).await.unwrap();
            }
        }

        let h = self.add_enforcer(e);
        Ok(Response::new(casbin_proto::NewEnforcerReply { handler: h }))
    }

And these are the errors I get -

error[E0277]: the trait bound `&Box<dyn Adapter>: Adapter` is not satisfied
   --> src/server/rpc_calls.rs:318:31
    |
318 |                 Ok(v) => Some(Box::new(v)),
    |                               ^^^^^^^^^^^ the trait `Adapter` is not implemented for `&Box<dyn Adapter>`
    |
    = note: required for the cast to the object type `dyn Adapter`

error[E0277]: the trait bound `Box<dyn Adapter>: Adapter` is not satisfied
   --> src/server/rpc_calls.rs:340:50
    |
340 |                 let e = casbin::Enforcer::new(m, v).await.unwrap();
    |                                                  ^ the trait `Adapter` is not implemented for `Box<dyn Adapter>`
    |
   ::: /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/casbin-2.0.9/src/core_api.rs:29:35
    |
29  |     async fn new<M: TryIntoModel, A: TryIntoAdapter>(
    |                                   - required by this bound in `new`
    |
    = note: required because of the requirements on the impl of `TryIntoAdapter` for `Box<dyn Adapter>`

Any ideas on how to go around managing these errors? @hackerchai @hsluoyz @xcaptain @PsiACE

[hsluoyz]

@hackerchai @PsiACE