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Note that this also adds `impl From<Status> for http::Response<BoxBody>` in order to make writing middleware which can return an error much easier.
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Original file line number | Diff line number | Diff line change |
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use hyper::{Body, Request as HyperRequest, Response as HyperResponse}; | ||
use std::task::{Context, Poll}; | ||
use tonic::{ | ||
body::BoxBody, | ||
transport::{NamedService, Server}, | ||
Request, Response, Status, | ||
}; | ||
use tower::Service; | ||
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use hello_world::greeter_server::{Greeter, GreeterServer}; | ||
use hello_world::{HelloReply, HelloRequest}; | ||
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pub mod hello_world { | ||
tonic::include_proto!("helloworld"); | ||
} | ||
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#[derive(Default)] | ||
pub struct MyGreeter {} | ||
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#[tonic::async_trait] | ||
impl Greeter for MyGreeter { | ||
async fn say_hello( | ||
&self, | ||
request: Request<HelloRequest>, | ||
) -> Result<Response<HelloReply>, Status> { | ||
println!("Got a request from {:?}", request.remote_addr()); | ||
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let reply = hello_world::HelloReply { | ||
message: format!("Hello {}!", request.into_inner().name), | ||
}; | ||
Ok(Response::new(reply)) | ||
} | ||
} | ||
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#[tokio::main] | ||
async fn main() -> Result<(), Box<dyn std::error::Error>> { | ||
let addr = "[::1]:50051".parse().unwrap(); | ||
let greeter = MyGreeter::default(); | ||
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println!("GreeterServer listening on {}", addr); | ||
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let svc = InterceptedService { | ||
inner: GreeterServer::new(greeter), | ||
}; | ||
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Server::builder().add_service(svc).serve(addr).await?; | ||
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Ok(()) | ||
} | ||
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#[derive(Debug, Clone)] | ||
struct InterceptedService<S> { | ||
inner: S, | ||
} | ||
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impl<S> Service<HyperRequest<Body>> for InterceptedService<S> | ||
where | ||
S: Service<HyperRequest<Body>, Response = HyperResponse<BoxBody>> | ||
+ NamedService | ||
+ Clone | ||
+ Send | ||
+ 'static, | ||
S::Future: Send + 'static, | ||
{ | ||
type Response = S::Response; | ||
type Error = S::Error; | ||
type Future = futures::future::BoxFuture<'static, Result<Self::Response, Self::Error>>; | ||
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fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
self.inner.poll_ready(cx) | ||
} | ||
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fn call(&mut self, req: HyperRequest<Body>) -> Self::Future { | ||
let mut svc = self.inner.clone(); | ||
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Box::pin(async move { | ||
// Do async work here.... | ||
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svc.call(req).await | ||
}) | ||
} | ||
} | ||
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impl<S: NamedService> NamedService for InterceptedService<S> { | ||
const NAME: &'static str = S::NAME; | ||
} |