'cannot move out of a shared reference'

[SiddheshKanawade]

I am trying to write the following function:

async fn new_enforcer(
        &self,
        mut i:Request<casbin_proto::NewEnforcerRequest>,
    ) -> Result<Response<casbin_proto::NewEnforcerReply>, Status> {
        // implement TryIntoMethod for following a as well
        let mut a: Option<Box<dyn Adapter>> = None;
        let e: Enforcer;


        if i.get_mut().adapter_handle != -1 {
            a = match self.get_adapter(i.into_inner().adapter_handle) {
                Ok(&v) => Some(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 })),
            };
        }

        if a.is_none() {
            let m = match DefaultModel::from_str(i.get_mut().model_text.as_str()).await {
                Ok(v) => v,
                Err(e) => return Ok(Response::new(casbin_proto::NewEnforcerReply { handler: 0 })),
            };
            e = match casbin::Enforcer::new(m, ()).await {
                Ok(v) => v,
                Err(er) => return Ok(Response::new(casbin_proto::NewEnforcerReply { handler: 0 })),
            };
        } else {
            let m = match DefaultModel::from_str(i.get_mut().model_text.as_str()).await {
                Ok(v) => v,
                Err(er) => return Ok(Response::new(casbin_proto::NewEnforcerReply { handler: 0 })),
            };

            e = match casbin::Enforcer::new(m, a).await {
                Ok(v) => v,
                Err(er) => return Ok(Response::new(casbin_proto::NewEnforcerReply { handler: 0 })),
            };
        }
        let h = self.add_enforcer(e);
        Ok(Response::new(casbin_proto::NewEnforcerReply { handler: h }))
    }

Here request is:

tonic::request
pub struct Request<T>

Here I get the following error:

For the similar errors, generally .clone() works since we passed a cloned to the function and not as reference. I found that we can't use it with tonic::requests. I am wondering how can we get rid of this error here.

My Cargo.toml has following version of tonic and prost:

tonic = "0.8.0"
prost = "0.11.0"
bytes = "1.2.1"

[LucioFranco]

You must updated your get_adapter method to take references and not ownership. I recommend this chapter of the book https://doc.rust-lang.org/book/ch04-00-understanding-ownership.html