feat(web): Implement tower::Layer for tonic_web::Config (#1119)

Signed-off-by: slinkydeveloper <francescoguard@gmail.com>
2022-10-28 19:59:01 +02:00
parent b409ddd478
commit 40536dc134
5 changed files with 47 additions and 6 deletions
@@ -24,6 +24,7 @@ hyper = "0.14"
 pin-project = "1"
 tonic = {version = "0.8", path = "../tonic", default-features = false, features = ["transport"]}
 tower-service = "0.3"
+tower-layer = "0.3"
 tracing = "0.1"

 [dev-dependencies]
@@ -4,7 +4,6 @@ use std::time::Duration;

 use http::{header::HeaderName, HeaderValue};
 use tonic::body::BoxBody;
-use tonic::transport::NamedService;
 use tower_service::Service;

 use crate::service::GrpcWeb;
@@ -152,11 +151,10 @@ impl Config {
    pub fn enable<S>(&self, service: S) -> GrpcWeb<S>
    where
        S: Service<http::Request<hyper::Body>, Response = http::Response<BoxBody>>,
-        S: NamedService + Clone + Send + 'static,
+        S: Clone + Send + 'static,
        S::Future: Send + 'static,
        S::Error: Into<BoxError> + Send,
    {
-        tracing::trace!("enabled for {}", S::NAME);
        GrpcWeb::new(service, self.clone())
    }
 }
@@ -0,0 +1,31 @@
+use super::{BoxBody, BoxError, Config, GrpcWeb};
+
+use tower_layer::Layer;
+use tower_service::Service;
+
+/// Layer implementing the grpc-web protocol.
+#[derive(Debug, Clone)]
+pub struct GrpcWebLayer {
+    _priv: (),
+}
+
+impl GrpcWebLayer {
+    /// Create a new grpc-web layer.
+    pub fn new() -> GrpcWebLayer {
+        Self { _priv: () }
+    }
+}
+
+impl<S> Layer<S> for GrpcWebLayer
+where
+    S: Service<http::Request<hyper::Body>, Response = http::Response<BoxBody>>,
+    S: Clone + Send + 'static,
+    S::Future: Send + 'static,
+    S::Error: Into<BoxError> + Send,
+{
+    type Service = GrpcWeb<S>;
+
+    fn layer(&self, inner: S) -> Self::Service {
+        Config::default().enable(inner)
+    }
+}
@@ -88,17 +88,18 @@
 #![doc(issue_tracker_base_url = "https://github.com/hyperium/tonic/issues/")]

 pub use config::Config;
+pub use layer::GrpcWebLayer;
+pub use service::GrpcWeb;

 mod call;
 mod config;
 mod cors;
+mod layer;
 mod service;

-use crate::service::GrpcWeb;
 use std::future::Future;
 use std::pin::Pin;
 use tonic::body::BoxBody;
-use tonic::transport::NamedService;
 use tower_service::Service;

 /// enable a tonic service to handle grpc-web requests with the default configuration.
@@ -107,7 +108,7 @@ use tower_service::Service;
 pub fn enable<S>(service: S) -> GrpcWeb<S>
 where
    S: Service<http::Request<hyper::Body>, Response = http::Response<BoxBody>>,
-    S: NamedService + Clone + Send + 'static,
+    S: Clone + Send + 'static,
    S::Future: Send + 'static,
    S::Error: Into<BoxError> + Send,
 {
@@ -15,6 +15,7 @@ use crate::{BoxError, BoxFuture, Config};

 const GRPC: &str = "application/grpc";

+/// Service implementing the grpc-web protocol.
 #[derive(Debug, Clone)]
 pub struct GrpcWeb<S> {
    inner: S,
@@ -266,6 +267,7 @@ mod tests {
    mod grpc_web {
        use super::*;
        use http::HeaderValue;
+        use tower_layer::Layer;

        fn request() -> Request<Body> {
            Request::builder()
@@ -284,6 +286,14 @@ mod tests {
            assert_eq!(res.status(), StatusCode::OK);
        }

+        #[tokio::test]
+        async fn web_layer() {
+            let mut svc = crate::GrpcWebLayer::new().layer(Svc);
+            let res = svc.call(request()).await.unwrap();
+
+            assert_eq!(res.status(), StatusCode::OK);
+        }
+
        #[tokio::test]
        async fn without_origin() {
            let mut svc = crate::enable(Svc);