chore: Update to tower 0.5

examples/Cargo.toml

@@ -276,7 +276,7 @@ tower = ["dep:hyper", "dep:hyper-util", "dep:tower", "tower?/timeout", "dep:http
 json-codec = ["dep:serde", "dep:serde_json", "dep:bytes"]
 compression = ["tonic/gzip"]
 tls = ["tonic/tls"]
-tls-rustls = ["dep:http", "dep:hyper", "dep:hyper-util", "dep:hyper-rustls", "dep:tower", "tower-http/util", "tower-http/add-extension", "dep:rustls-pemfile", "dep:tokio-rustls", "dep:pin-project", "dep:http-body-util"]
+tls-rustls = ["dep:http", "dep:hyper", "dep:hyper-util", "dep:hyper-rustls", "dep:tower04", "tower-http/util", "tower-http/add-extension", "dep:rustls-pemfile", "dep:tokio-rustls", "dep:pin-project", "dep:http-body-util"]
 dynamic-load-balance = ["dep:tower"]
 timeout = ["tokio/time", "dep:tower", "tower?/timeout"]
 tls-client-auth = ["tonic/tls"]
@@ -300,7 +300,8 @@ tonic-types = { path = "../tonic-types", optional = true }
 async-stream = { version = "0.3", optional = true }
 tokio-stream = { version = "0.1", optional = true }
 tokio-util = { version = "0.7.8", optional = true }
-tower = { version = "0.4", optional = true }
+tower = { version = "0.5", optional = true }
+tower04 = { package = "tower", version = "0.4", optional = true, features = ["timeout"] } # `timeout` is set as workaround for cargo-deny
 rand = { version = "0.8", optional = true }
 serde = { version = "1.0", features = ["derive"], optional = true }
 serde_json = { version = "1.0", optional = true }

examples/src/tls_rustls/client.rs

@@ -1,5 +1,6 @@
 //! This examples shows how you can combine `hyper-rustls` and `tonic` to
 //! provide a custom `ClientConfig` for the tls configuration.
+use tower04 as tower;
 
 pub mod pb {
     tonic::include_proto!("/grpc.examples.unaryecho");

examples/src/tls_rustls/server.rs

@@ -1,3 +1,5 @@
+use tower04 as tower;
+
 pub mod pb {
     tonic::include_proto!("/grpc.examples.unaryecho");
 }

interop/Cargo.toml

@@ -26,7 +26,7 @@ prost = "0.13"
 tokio = {version = "1.0", features = ["rt-multi-thread", "time", "macros"]}
 tokio-stream = "0.1"
 tonic = {path = "../tonic", features = ["tls"]}
-tower = {version = "0.4"}
+tower = "0.5"
 tracing-subscriber = {version = "0.3"}
 
 [build-dependencies]

tests/compression/Cargo.toml

@@ -19,7 +19,7 @@ prost = "0.13"
 tokio = {version = "1.0", features = ["macros", "rt-multi-thread", "net"]}
 tokio-stream = "0.1"
 tonic = {path = "../../tonic", features = ["gzip", "zstd"]}
-tower = {version = "0.4", features = []}
+tower = "0.5"
 tower-http = {version = "0.5", features = ["map-response-body", "map-request-body"]}
 
 [build-dependencies]

tests/integration_tests/Cargo.toml

@@ -21,7 +21,7 @@ http = "1"
 http-body = "1"
 hyper-util = "0.1"
 tokio-stream = {version = "0.1.5", features = ["net"]}
-tower = {version = "0.4", features = []}
+tower = "0.5"
 tower-http = { version = "0.5", features = ["set-header", "trace"] }
 tower-service = "0.3"
 tracing = "0.1"

tonic/Cargo.toml

@@ -47,7 +47,7 @@ server = [
 channel = [
   "dep:hyper", "hyper?/client",
   "dep:hyper-util", "hyper-util?/client-legacy",
-  "dep:tower", "tower?/balance", "tower?/buffer", "tower?/discover", "tower?/limit",
+  "dep:tower", "tower?/balance", "tower?/buffer", "tower?/discover", "tower?/limit", "tower?/util",
   "dep:tokio", "tokio?/time",
   "dep:hyper-timeout",
 ]
@@ -84,7 +84,7 @@ hyper = {version = "1", features = ["http1", "http2"], optional = true}
 hyper-util = { version = "0.1.4", features = ["tokio"], optional = true }
 socket2 = { version = "0.5", optional = true, features = ["all"] }
 tokio = {version = "1", default-features = false, optional = true}
-tower = {version = "0.4.7", default-features = false, optional = true}
+tower = {version = "0.5", default-features = false, optional = true}
 axum = {version = "0.7", default-features = false, optional = true}
 
 # rustls
@@ -107,7 +107,7 @@ quickcheck_macros = "1.0"
 rand = "0.8"
 static_assertions = "1.0"
 tokio = {version = "1.0", features = ["rt", "macros"]}
-tower = {version = "0.4.7", features = ["full"]}
+tower = {version = "0.5", features = ["full"]}
 
 [package.metadata.docs.rs]
 all-features = true

tonic/src/transport/channel/mod.rs

@@ -31,12 +31,11 @@ use tower::balance::p2c::Balance;
 use tower::{
     buffer::{self, Buffer},
     discover::{Change, Discover},
-    util::{BoxService, Either},
+    util::BoxService,
     Service,
 };
 
 type BoxFuture<'a, T> = Pin<Box<dyn Future<Output = T> + Send + 'a>>;
-type Svc = Either<Connection, BoxService<Request<BoxBody>, Response<BoxBody>, crate::Error>>;
 
 const DEFAULT_BUFFER_SIZE: usize = 1024;
 
@@ -65,14 +64,15 @@ const DEFAULT_BUFFER_SIZE: usize = 1024;
 /// cloning the `Channel` type is cheap and encouraged.
 #[derive(Clone)]
 pub struct Channel {
-    svc: Buffer<Svc, Request<BoxBody>>,
+    svc: Buffer<Request<BoxBody>, BoxFuture<'static, Result<Response<BoxBody>, crate::Error>>>,
 }
 
 /// A future that resolves to an HTTP response.
 ///
 /// This is returned by the `Service::call` on [`Channel`].
 pub struct ResponseFuture {
-    inner: buffer::future::ResponseFuture<<Svc as Service<Request<BoxBody>>>::Future>,
+    inner:
+        buffer::future::ResponseFuture<BoxFuture<'static, Result<Response<BoxBody>, crate::Error>>>,
 }
 
 impl Channel {
@@ -156,7 +156,8 @@ impl Channel {
         let executor = endpoint.executor.clone();
 
         let svc = Connection::lazy(connector, endpoint);
-        let (svc, worker) = Buffer::pair(Either::A(svc), buffer_size);
+        let (svc, worker) = Buffer::pair(svc, buffer_size);
+
         executor.execute(worker);
 
         Channel { svc }
@@ -175,7 +176,7 @@ impl Channel {
         let svc = Connection::connect(connector, endpoint)
             .await
             .map_err(super::Error::from_source)?;
-        let (svc, worker) = Buffer::pair(Either::A(svc), buffer_size);
+        let (svc, worker) = Buffer::pair(svc, buffer_size);
         executor.execute(worker);
 
         Ok(Channel { svc })
@@ -191,7 +192,7 @@ impl Channel {
         let svc = Balance::new(discover);
 
         let svc = BoxService::new(svc);
-        let (svc, worker) = Buffer::pair(Either::B(svc), buffer_size);
+        let (svc, worker) = Buffer::pair(svc, buffer_size);
         executor.execute(Box::pin(worker));
 
         Channel { svc }

tonic/src/transport/server/mod.rs

@@ -1037,10 +1037,10 @@ where
             .layer(BoxCloneService::layer())
             .map_request(move |mut request: Request<BoxBody>| {
                 match &conn_info {
-                    tower::util::Either::A(inner) => {
+                    tower::util::Either::Left(inner) => {
                         request.extensions_mut().insert(inner.clone());
                     }
-                    tower::util::Either::B(inner) => {
+                    tower::util::Either::Right(inner) => {
                         #[cfg(feature = "tls")]
                         {
                             request.extensions_mut().insert(inner.clone());

tonic/src/transport/server/service/io.rs

@@ -37,9 +37,9 @@ impl<IO> ServerIo<IO> {
         IO: Connected,
     {
         match self {
-            Self::Io(io) => Either::A(io.connect_info()),
+            Self::Io(io) => Either::Left(io.connect_info()),
             #[cfg(feature = "tls")]
-            Self::TlsIo(io) => Either::B(io.connect_info()),
+            Self::TlsIo(io) => Either::Right(io.connect_info()),
         }
     }
 }