Cargo.toml: Deprecate executor specific features for sub-crates (#2962)

CHANGELOG.md

@@ -48,6 +48,16 @@
 - Remove default features. You need to enable required features explicitly now. As a quick workaround, you may want to use the
   new `full` feature which activates all features. See [PR 2918].
 
+- Introduce `tokio` and `async-std` features and deprecate the following ones:
+  - `tcp-tokio` in favor of `tcp` + `tokio`
+  - `mdns-tokio` in favor of `mdns` + `tokio`
+  - `dns-tokio` in favor of `dns` + `tokio`
+  - `tcp-async-io` in favor of `tcp` + `async-std`
+  - `mdns-async-io` in favor of `mdns` + `async-std`
+  - `dns-async-std` in favor of `dns` + `async-std`
+  
+  See [PR 2962].
+
 - Update individual crates.
     - Update to [`libp2p-autonat` `v0.8.0`](protocols/autonat/CHANGELOG.md#0080).
     - Update to [`libp2p-core` `v0.37.0`](core/CHANGELOG.md#0370).
@@ -75,7 +85,8 @@
     - Update to [`libp2p-websocket` `v0.39.0`](transports/websocket/CHANGELOG.md#0390).
     - Update to [`libp2p-yamux` `v0.41.0`](muxers/mplex/CHANGELOG.md#0410).
 
-- [PR 2918]: https://github.com/libp2p/rust-libp2p/pull/2918
+[PR 2918]: https://github.com/libp2p/rust-libp2p/pull/2918
+[PR 2962]: https://github.com/libp2p/rust-libp2p/pull/2962
 
 # 0.48.0
 

Cargo.toml

@@ -12,9 +12,11 @@ categories = ["network-programming", "asynchronous"]
 
 [features]
 full = [
+    "async-std",
     "autonat",
     "dcutr",
     "deflate",
+    "dns",
     "dns-async-std",
     "dns-tokio",
     "ecdsa",
@@ -22,6 +24,7 @@ full = [
     "gossipsub",
     "identify",
     "kad",
+    "mdns",
     "mdns-async-io",
     "mdns-tokio",
     "metrics",
@@ -36,8 +39,10 @@ full = [
     "rsa",
     "secp256k1",
     "serde",
+    "tcp",
     "tcp-async-io",
     "tcp-tokio",
+    "tokio",
     "uds",
     "wasm-bindgen",
     "wasm-ext",
@@ -48,6 +53,7 @@ full = [
 autonat = ["dep:libp2p-autonat"]
 dcutr = ["dep:libp2p-dcutr", "libp2p-metrics?/dcutr"]
 deflate = ["dep:libp2p-deflate"]
+dns = ["dep:libp2p-dns"]
 dns-async-std = ["dep:libp2p-dns", "libp2p-dns?/async-std"]
 dns-tokio = ["dep:libp2p-dns", "libp2p-dns?/tokio"]
 floodsub = ["dep:libp2p-floodsub"]
@@ -55,6 +61,7 @@ identify = ["dep:libp2p-identify", "libp2p-metrics?/identify"]
 kad = ["dep:libp2p-kad", "libp2p-metrics?/kad"]
 gossipsub = ["dep:libp2p-gossipsub", "libp2p-metrics?/gossipsub"]
 metrics = ["dep:libp2p-metrics"]
+mdns = ["dep:libp2p-mdns"]
 mdns-async-io = ["dep:libp2p-mdns", "libp2p-mdns?/async-io"]
 mdns-tokio = ["dep:libp2p-mdns", "libp2p-mdns?/tokio"]
 mplex = ["dep:libp2p-mplex"]
@@ -65,6 +72,7 @@ pnet = ["dep:libp2p-pnet"]
 relay = ["dep:libp2p-relay", "libp2p-metrics?/relay"]
 request-response = ["dep:libp2p-request-response"]
 rendezvous = ["dep:libp2p-rendezvous"]
+tcp = ["dep:libp2p-tcp"]
 tcp-async-io = ["dep:libp2p-tcp", "libp2p-tcp?/async-io"]
 tcp-tokio = ["dep:libp2p-tcp", "libp2p-tcp?/tokio"]
 uds = ["dep:libp2p-uds"]
@@ -77,6 +85,8 @@ secp256k1 = ["libp2p-core/secp256k1"]
 rsa = ["libp2p-core/rsa"]
 ecdsa = ["libp2p-core/ecdsa"]
 serde = ["libp2p-core/serde", "libp2p-kad?/serde", "libp2p-gossipsub?/serde"]
+tokio = ["libp2p-mdns?/tokio", "libp2p-tcp?/tokio", "libp2p-dns?/tokio"]
+async-std = ["libp2p-mdns?/async-io", "libp2p-tcp?/async-io", "libp2p-dns?/async-std"]
 
 [package.metadata.docs.rs]
 all-features = true
@@ -128,7 +138,7 @@ libp2p-gossipsub = { version = "0.42.1", path = "protocols/gossipsub", optional
 async-std = { version = "1.6.2", features = ["attributes"] }
 async-trait = "0.1"
 env_logger = "0.9.0"
-clap = {version = "3.1.6", features = ["derive"]}
+clap = { version = "3.1.6", features = ["derive"] }
 tokio = { version = "1.15", features = ["io-util", "io-std", "macros", "rt", "rt-multi-thread"] }
 
 [workspace]

src/lib.rs

@@ -54,14 +54,31 @@ pub use libp2p_dcutr as dcutr;
 #[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")))]
 #[doc(inline)]
 pub use libp2p_deflate as deflate;
-#[cfg(any(feature = "dns-async-std", feature = "dns-tokio"))]
+#[deprecated(
+    since = "0.49.0",
+    note = "The `dns-tokio` and `dns-async-std` features are deprecated. Use the new `dns` feature together with the `tokio` or `async-std` features."
+)]
+#[cfg(all(
+    any(feature = "dns-tokio", feature = "dns-async-std"),
+    not(feature = "dns")
+))]
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")))]
 #[cfg_attr(
     docsrs,
-    doc(cfg(any(feature = "dns-async-std", feature = "dns-tokio")))
+    doc(cfg(any(feature = "dns-tokio", feature = "dns-async-std")))
 )]
+pub mod dns {
+    #[doc(inline)]
+    pub use libp2p_dns::*;
+}
+
+#[cfg(feature = "dns")]
 #[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")))]
-#[doc(inline)]
+#[cfg_attr(docsrs, doc(cfg(feature = "dns")))]
-pub use libp2p_dns as dns;
+pub mod dns {
+    #[doc(inline)]
+    pub use libp2p_dns::*;
+}
 #[cfg(feature = "floodsub")]
 #[cfg_attr(docsrs, doc(cfg(feature = "floodsub")))]
 #[doc(inline)]
@@ -79,14 +96,31 @@ pub use libp2p_identify as identify;
 #[cfg_attr(docsrs, doc(cfg(feature = "kad")))]
 #[doc(inline)]
 pub use libp2p_kad as kad;
-#[cfg(any(feature = "mdns-async-io", feature = "mdns-tokio"))]
+#[deprecated(
+    since = "0.49.0",
+    note = "The `mdns-tokio` and `mdns-async-io` features are deprecated. Use the new `mdns` feature together with the `tokio` or `async-std` features."
+)]
+#[cfg(all(
+    any(feature = "mdns-async-io", feature = "mdns-tokio"),
+    not(feature = "mdns")
+))]
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")))]
 #[cfg_attr(
     docsrs,
     doc(cfg(any(feature = "mdns-tokio", feature = "mdns-async-io")))
 )]
+pub mod mdns {
+    #[doc(inline)]
+    pub use libp2p_mdns::*;
+}
+
+#[cfg(feature = "mdns")]
 #[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")))]
-#[doc(inline)]
+#[cfg_attr(docsrs, doc(cfg(feature = "mdns")))]
-pub use libp2p_mdns as mdns;
+pub mod mdns {
+    #[doc(inline)]
+    pub use libp2p_mdns::*;
+}
 #[cfg(feature = "metrics")]
 #[cfg_attr(docsrs, doc(cfg(feature = "metrics")))]
 #[doc(inline)]
@@ -125,11 +159,28 @@ pub use libp2p_rendezvous as rendezvous;
 pub use libp2p_request_response as request_response;
 #[doc(inline)]
 pub use libp2p_swarm as swarm;
-#[cfg(any(feature = "tcp-async-io", feature = "tcp-tokio"))]
+#[deprecated(
-#[cfg_attr(docsrs, doc(cfg(any(feature = "tcp-async-io", feature = "tcp-tokio"))))]
+    since = "0.49.0",
+    note = "The `tcp-tokio` and `tcp-async-io` features are deprecated. Use the new `tcp` feature together with the `tokio` or `async-std` features."
+)]
+#[cfg(all(
+    any(feature = "tcp-tokio", feature = "tcp-async-io"),
+    not(feature = "tcp")
+))]
 #[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")))]
-#[doc(inline)]
+#[cfg_attr(docsrs, doc(cfg(any(feature = "tcp-tokio", feature = "tcp-async-io"))))]
-pub use libp2p_tcp as tcp;
+pub mod tcp {
+    #[doc(inline)]
+    pub use libp2p_tcp::*;
+}
+
+#[cfg(feature = "tcp")]
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")))]
+#[cfg_attr(docsrs, doc(cfg(feature = "tcp")))]
+pub mod tcp {
+    #[doc(inline)]
+    pub use libp2p_tcp::*;
+}
 #[cfg(feature = "uds")]
 #[cfg_attr(docsrs, doc(cfg(feature = "uds")))]
 #[doc(inline)]
@@ -181,8 +232,10 @@ pub use libp2p_swarm_derive::NetworkBehaviour;
 /// >           reserves the right to support additional protocols or remove deprecated protocols.
 #[cfg(all(
     not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")),
-    feature = "tcp-async-io",
+    any(
-    feature = "dns-async-std",
+        all(feature = "tcp-async-io", feature = "dns-async-std"),
+        all(feature = "tcp", feature = "dns", feature = "async-std")
+    ),
     feature = "websocket",
     feature = "noise",
     feature = "mplex",
@@ -192,14 +245,26 @@ pub use libp2p_swarm_derive::NetworkBehaviour;
     docsrs,
     doc(cfg(all(
         not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")),
-        feature = "tcp-async-io",
+        any(
-        feature = "dns-async-std",
+            all(feature = "tcp-async-io", feature = "dns-async-std"),
+            all(feature = "tcp", feature = "dns", feature = "async-std")
+        ),
         feature = "websocket",
         feature = "noise",
         feature = "mplex",
         feature = "yamux"
     )))
 )]
+#[cfg_attr(
+    all(
+        any(feature = "tcp-async-io", feature = "dns-async-std"),
+        not(feature = "async-std")
+    ),
+    deprecated(
+        since = "0.49.0",
+        note = "The `tcp-async-io` and `dns-async-std` features are deprecated. Use the new `tcp` and `dns` features together with the `async-std` feature."
+    )
+)]
 pub async fn development_transport(
     keypair: identity::Keypair,
 ) -> std::io::Result<core::transport::Boxed<(PeerId, core::muxing::StreamMuxerBox)>> {
@@ -241,8 +306,10 @@ pub async fn development_transport(
 /// >           reserves the right to support additional protocols or remove deprecated protocols.
 #[cfg(all(
     not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")),
-    feature = "tcp-tokio",
+    any(
-    feature = "dns-tokio",
+        all(feature = "tcp-tokio", feature = "dns-tokio"),
+        all(feature = "tcp", feature = "dns", feature = "tokio")
+    ),
     feature = "websocket",
     feature = "noise",
     feature = "mplex",
@@ -252,14 +319,26 @@ pub async fn development_transport(
     docsrs,
     doc(cfg(all(
         not(any(target_os = "emscripten", target_os = "wasi", target_os = "unknown")),
-        feature = "tcp-tokio",
+        any(
-        feature = "dns-tokio",
+            all(feature = "tcp-tokio", feature = "dns-tokio"),
+            all(feature = "tcp", feature = "dns", feature = "tokio")
+        ),
         feature = "websocket",
         feature = "noise",
         feature = "mplex",
         feature = "yamux"
     )))
 )]
+#[cfg_attr(
+    all(
+        any(feature = "tcp-tokio", feature = "dns-tokio"),
+        not(feature = "tokio")
+    ),
+    deprecated(
+        since = "0.49.0",
+        note = "The `tcp-tokio` and `dns-tokio` features are deprecated. Use the new `tcp` and `dns` feature together with the `tokio` feature."
+    )
+)]
 pub fn tokio_development_transport(
     keypair: identity::Keypair,
 ) -> std::io::Result<core::transport::Boxed<(PeerId, core::muxing::StreamMuxerBox)>> {