Is there how to apply two or more layers or interceptors to a service?

[mm1995tk]

Suppose we have the following code.

I would like to apply interceptor as follows

• svc_a: intercept0, intercept1, intercept3
• svc_b: intercept0, intercept2, intercept3
• svc_c: intercept0

How can this be resolved?

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let addr = "[::1]:50051".parse()?;
    let sample_a = SampleApiAImpl::default();
    let sample_b = SampleApiBImpl::default();
    let sample_c = SampleApiCImpl::default();

    let svc_a = SampleApiAServer::new(sample_a);
    let svc_b = SampleApiBServer::new(sample_b);
    let svc_c = SampleApiCServer::new(sample_c);

    Server::builder()
        .layer(tonic::service::interceptor(intercept0))
        .add_service(svc_a)
        .add_service(svc_b)
        .add_service(svc_c)
        .serve(addr)
        .await?;

    Ok(())
}

fn intercept0(req: Request<()>) -> Result<Request<()>, Status> {
    println!("Intercepting 0");

    Ok(req)
}

fn intercept1(req: Request<()>) -> Result<Request<()>, Status> {
    println!("Intercepting 1");

    Ok(req)
}

fn intercept2(req: Request<()>) -> Result<Request<()>, Status> {
    println!("Intercepting 2");

    Ok(req)
}

fn intercept3(req: Request<()>) -> Result<Request<()>, Status> {
    println!("Intercepting 3");

    Ok(req)
}

[davidpdrsn]

Look at tower middleware. There are examples in this repo. Interceptors are implemented as tower middleware internally.

[mm1995tk]

Thanks to you I was able to solve my problem.