Support 32bits targets (#1811)

* Replace AtomicU64 with AtomicUsize to prevent compilation issues on 32 bits platforms.

* Make sure that Rust tests compile on MacOS.

* Add CHANGELOG next entry.

CHANGELOG.next.toml

@@ -11,6 +11,22 @@
 # meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "client | server | all"}
 # author = "rcoh"
 
+[[smithy-rs]]
+message = """
+Replace all usages of `AtomicU64` with `AtomicUsize` to support 32bit targets.
+"""
+references = ["smithy-rs#1811"]
+meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "server"}
+author = "LukeMathWalker"
+
+[[smithy-rs]]
+message = """
+Replace all usages of `AtomicU64` with `AtomicUsize` to support 32bit targets.
+"""
+references = ["smithy-rs#1811"]
+meta = { "breaking" = true, "tada" = false, "bug" = false, "target" = "client"}
+author = "LukeMathWalker"
+
 [[smithy-rs]]
 message = """
 Mark `operation` and `operation_handler` modules as private in the generated server crate.

rust-runtime/aws-smithy-client/src/never.rs

@@ -10,7 +10,7 @@ use http::Uri;
 use aws_smithy_async::future::never::Never;
 
 use std::marker::PhantomData;
-use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
 
 use std::task::{Context, Poll};
@@ -27,7 +27,7 @@ use tower::BoxError;
 #[derive(Debug)]
 pub struct NeverService<Req, Resp, Err> {
     _resp: PhantomData<(Req, Resp, Err)>,
-    invocations: Arc<AtomicU64>,
+    invocations: Arc<AtomicUsize>,
 }
 
 impl<Req, Resp, Err> Clone for NeverService<Req, Resp, Err> {
@@ -55,7 +55,7 @@ impl<Req, Resp, Err> NeverService<Req, Resp, Err> {
     }
 
     /// Returns the number of invocations made to this service
-    pub fn num_calls(&self) -> u64 {
+    pub fn num_calls(&self) -> usize {
         self.invocations.load(Ordering::SeqCst)
     }
 }

rust-runtime/aws-smithy-http-server-python/src/socket.rs

@@ -73,6 +73,14 @@ impl PySocket {
 }
 
 #[cfg(test)]
+// `is_listener` on `Socket` is only available on certain platforms.
+// In particular, this fails to compile on MacOS.
+#[cfg(any(
+    target_os = "android",
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "linux",
+))]
 mod tests {
     use super::*;
 

rust-runtime/aws-smithy-http-server/examples/pokemon-service/src/lib.rs

@@ -10,7 +10,7 @@
 use std::{
     collections::HashMap,
     convert::TryInto,
-    sync::{atomic::AtomicU64, Arc},
+    sync::{atomic::AtomicUsize, Arc},
 };
 
 use async_stream::stream;
@@ -108,7 +108,7 @@ struct PokemonTranslations {
 #[derive(Debug)]
 pub struct State {
     pokemons_translations: HashMap<String, PokemonTranslations>,
-    call_count: AtomicU64,
+    call_count: AtomicUsize,
 }
 
 impl Default for State {