You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/rust-bible/part7/grpc/grpc-demo/src
    
    the code of the file until where you have to start completion: use rust_grpc::hello::greeter_service_server::{GreeterService, GreeterServiceServer};
use rust_grpc::hello::{HelloReply, HelloReq};

use tonic::{transport::Server, Request, Response, Status};

// 定义grpc代码生成的包名
mod rust_grpc;

// 实现hello.pr
    
    async fn say_hello(&self, request: Request<HelloReq>) -> Result<Response<HelloReply>, Status> {
        let req = &request.into_inner();
        println!("got request.id:{}", req.id);
        println!("got request.name:{}", req.name);
        let reply = HelloReply {
            message: format!("hello,rust grpc"),
            // 由于gRPC请求和响应中的字段都是私有的，所以需要使用 .into_inner()
            name: format!("{}", req.name).into(),
        };

        Ok(Response::new(reply))
    }