feat(libp2p): arch gates *-websys export and dependencies.

This merge request architecture gates *-websys dependencies to wasm in Cargo.toml and does similar arch gating in lib.rs for rexports of *-websys targets.

Closes #5885

Pull-Request: #5891.

Author: elijahhampton

libp2p/CHANGELOG.md

@@ -2,6 +2,9 @@
 - Introduce `libp2p-webrtc-websys` behind `webrtc-websys` feature flag.
   See [PR 5819](https://github.com/libp2p/rust-libp2p/pull/5819).
 
+- Make the `*-websys` variants (`libp2p-webrtc-websys`, `libp2p-websocket-websys`, `libp2p-webtransport-websys`) only available on wasm32 target architecture.
+  See [PR 5891](https://github.com/libp2p/rust-libp2p/pull/5891).
+  
 ## 0.55.0
 
 - Raise MSRV to 1.83.0.

libp2p/Cargo.toml

@@ -99,7 +99,6 @@ futures-timer = "3.0.2" # Explicit dependency to be used in `wasm-bindgen` featu
 getrandom = { workspace = true } # Explicit dependency to be used in `wasm-bindgen` feature
 # TODO feature flag?
 rw-stream-sink = { workspace = true }
-
 libp2p-allow-block-list = { workspace = true }
 libp2p-autonat = { workspace = true, optional = true }
 libp2p-connection-limits = { workspace = true }
@@ -119,14 +118,16 @@ libp2p-relay = { workspace = true, optional = true }
 libp2p-rendezvous = { workspace = true, optional = true }
 libp2p-request-response = { workspace = true, optional = true }
 libp2p-swarm = { workspace = true }
-libp2p-webrtc-websys = { workspace = true, optional = true }
-libp2p-websocket-websys = { workspace = true, optional = true }
-libp2p-webtransport-websys = { workspace = true, optional = true }
 libp2p-yamux = { workspace = true, optional = true }
 multiaddr = { workspace = true }
 pin-project = "1.0.0"
 thiserror = { workspace = true }
 
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+libp2p-webrtc-websys = { workspace = true, optional = true }
+libp2p-websocket-websys = { workspace = true, optional = true }
+libp2p-webtransport-websys = { workspace = true, optional = true }
+
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 libp2p-dns = { workspace = true, optional = true }
 libp2p-mdns = { workspace = true, optional = true }

libp2p/src/lib.rs

@@ -123,17 +123,17 @@ pub use libp2p_uds as uds;
 #[cfg(not(target_arch = "wasm32"))]
 #[doc(inline)]
 pub use libp2p_upnp as upnp;
-#[cfg(feature = "webrtc-websys")]
+#[cfg(all(feature = "webrtc-websys", target_arch = "wasm32"))]
 #[doc(inline)]
 pub use libp2p_webrtc_websys as webrtc_websys;
 #[cfg(feature = "websocket")]
 #[cfg(not(target_arch = "wasm32"))]
 #[doc(inline)]
 pub use libp2p_websocket as websocket;
-#[cfg(feature = "websocket-websys")]
+#[cfg(all(feature = "websocket-websys", target_arch = "wasm32"))]
 #[doc(inline)]
 pub use libp2p_websocket_websys as websocket_websys;
-#[cfg(feature = "webtransport-websys")]
+#[cfg(all(feature = "webtransport-websys", target_arch = "wasm32"))]
 #[cfg_attr(docsrs, doc(cfg(feature = "webtransport-websys")))]
 #[doc(inline)]
 pub use libp2p_webtransport_websys as webtransport_websys;