1 use tonic::{transport::Server, Code, Request, Response, Status};
2 use tonic_types::{ErrorDetails, StatusExt};
3
4 use hello_world::greeter_server::{Greeter, GreeterServer};
5 use hello_world::{HelloReply, HelloRequest};
6
7 pub mod hello_world {
8 tonic::include_proto!("helloworld");
9 }
10
11 #[derive(Default)]
12 pub struct MyGreeter {}
13
14 #[tonic::async_trait]
15 impl Greeter for MyGreeter {
say_hello( &self, request: Request<HelloRequest>, ) -> Result<Response<HelloReply>, Status>16 async fn say_hello(
17 &self,
18 request: Request<HelloRequest>,
19 ) -> Result<Response<HelloReply>, Status> {
20 println!("Got a request from {:?}", request.remote_addr());
21
22 // Extract request data
23 let name = request.into_inner().name;
24
25 // Create empty ErrorDetails struct
26 let mut err_details = ErrorDetails::new();
27
28 // Add error details conditionally
29 if name.is_empty() {
30 err_details.add_bad_request_violation("name", "name cannot be empty");
31 } else if name.len() > 20 {
32 err_details.add_bad_request_violation("name", "name is too long");
33 }
34
35 if err_details.has_bad_request_violations() {
36 // Add additional error details if necessary
37 err_details
38 .add_help_link("description of link", "https://resource.example.local")
39 .set_localized_message("en-US", "message for the user");
40
41 // Generate error status
42 let status = Status::with_error_details(
43 Code::InvalidArgument,
44 "request contains invalid arguments",
45 err_details,
46 );
47
48 return Err(status);
49 }
50
51 let reply = hello_world::HelloReply {
52 message: format!("Hello {}!", name),
53 };
54 Ok(Response::new(reply))
55 }
56 }
57
58 #[tokio::main]
main() -> Result<(), Box<dyn std::error::Error>>59 async fn main() -> Result<(), Box<dyn std::error::Error>> {
60 let addr = "[::1]:50051".parse().unwrap();
61 let greeter = MyGreeter::default();
62
63 println!("GreeterServer listening on {}", addr);
64
65 Server::builder()
66 .add_service(GreeterServer::new(greeter))
67 .serve(addr)
68 .await?;
69
70 Ok(())
71 }
72