libp2p · mergify · Jun 24, 2025 · Jun 7, 2025 · Jun 24, 2025 · Jun 24, 2025
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -80,7 +80,7 @@ libp2p-autonat = { version = "0.14.1", path = "protocols/autonat" }
 libp2p-connection-limits = { version = "0.5.1", path = "misc/connection-limits" }
 libp2p-core = { version = "0.43.1", path = "core" }
 libp2p-dcutr = { version = "0.13.0", path = "protocols/dcutr" }
-libp2p-dns = { version = "0.44.0", path = "transports/dns" }
+libp2p-dns = { version = "0.45.0", path = "transports/dns" }
 libp2p-floodsub = { version = "0.46.1", path = "protocols/floodsub" }
 libp2p-gossipsub = { version = "0.49.0", path = "protocols/gossipsub" }
 libp2p-identify = { version = "0.47.0", path = "protocols/identify" }

diff --git a/libp2p/CHANGELOG.md b/libp2p/CHANGELOG.md
@@ -15,6 +15,9 @@
 
 - Remove QUIC from the `async-std` swarm builder, as `async-std` support was removed from `libp2p-quic` transport.
   See [PR 5954](https://github.com/libp2p/rust-libp2p/pull/5954)
+
+- Remove DNS from the `async-std` swarm builder, as `async-std` support was removed from `libp2p-dns` transport.
+  See [PR 5959](https://github.com/libp2p/rust-libp2p/pull/5959)
 
 ## 0.55.0
 

diff --git a/libp2p/Cargo.toml b/libp2p/Cargo.toml
@@ -53,7 +53,7 @@ full = [
     "upnp",
 ]
 
-async-std = ["libp2p-swarm/async-std", "libp2p-tcp?/async-io", "libp2p-dns?/async-std"]
+async-std = ["libp2p-swarm/async-std", "libp2p-tcp?/async-io"]
 autonat = ["dep:libp2p-autonat"]
 cbor = ["libp2p-request-response?/cbor"]
 dcutr = ["dep:libp2p-dcutr", "libp2p-metrics?/dcutr"]

diff --git a/libp2p/src/builder/phase/dns.rs b/libp2p/src/builder/phase/dns.rs
@@ -7,27 +7,6 @@ pub struct DnsPhase<T> {
     pub(crate) transport: T,
 }
 
-#[cfg(all(not(target_arch = "wasm32"), feature = "async-std", feature = "dns"))]
-impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::AsyncStd, DnsPhase<T>> {
-    pub fn with_dns(
-        self,
-    ) -> Result<
-        SwarmBuilder<
-            super::provider::AsyncStd,
-            WebsocketPhase<impl AuthenticatedMultiplexedTransport>,
-        >,
-        std::io::Error,
-    > {
-        Ok(SwarmBuilder {
-            keypair: self.keypair,
-            phantom: PhantomData,
-            phase: WebsocketPhase {
-                transport: libp2p_dns::async_std::Transport::system2(self.phase.transport)?,
-            },
-        })
-    }
-}
-
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio", feature = "dns"))]
 impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::Tokio, DnsPhase<T>> {
     pub fn with_dns(
@@ -49,30 +28,6 @@ impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::Tokio,
     }
 }
 
-#[cfg(all(not(target_arch = "wasm32"), feature = "async-std", feature = "dns"))]
-impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::AsyncStd, DnsPhase<T>> {
-    pub fn with_dns_config(
-        self,
-        cfg: libp2p_dns::ResolverConfig,
-        opts: libp2p_dns::ResolverOpts,
-    ) -> SwarmBuilder<
-        super::provider::AsyncStd,
-        WebsocketPhase<impl AuthenticatedMultiplexedTransport>,
-    > {
-        SwarmBuilder {
-            keypair: self.keypair,
-            phantom: PhantomData,
-            phase: WebsocketPhase {
-                transport: libp2p_dns::async_std::Transport::custom2(
-                    self.phase.transport,
-                    cfg,
-                    opts,
-                ),
-            },
-        }
-    }
-}
-
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio", feature = "dns"))]
 impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::Tokio, DnsPhase<T>> {
     pub fn with_dns_config(

diff --git a/libp2p/src/builder/phase/other_transport.rs b/libp2p/src/builder/phase/other_transport.rs
@@ -66,22 +66,6 @@ impl<Provider, T: AuthenticatedMultiplexedTransport>
 }
 
 // Shortcuts
-#[cfg(all(not(target_arch = "wasm32"), feature = "async-std", feature = "dns"))]
-impl<T: AuthenticatedMultiplexedTransport>
-    SwarmBuilder<super::provider::AsyncStd, OtherTransportPhase<T>>
-{
-    pub fn with_dns(
-        self,
-    ) -> Result<
-        SwarmBuilder<
-            super::provider::AsyncStd,
-            WebsocketPhase<impl AuthenticatedMultiplexedTransport>,
-        >,
-        std::io::Error,
-    > {
-        self.without_any_other_transports().with_dns()
-    }
-}
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio", feature = "dns"))]
 impl<T: AuthenticatedMultiplexedTransport>
     SwarmBuilder<super::provider::Tokio, OtherTransportPhase<T>>
@@ -98,22 +82,6 @@ impl<T: AuthenticatedMultiplexedTransport>
         self.without_any_other_transports().with_dns()
     }
 }
-#[cfg(all(not(target_arch = "wasm32"), feature = "async-std", feature = "dns"))]
-impl<T: AuthenticatedMultiplexedTransport>
-    SwarmBuilder<super::provider::AsyncStd, OtherTransportPhase<T>>
-{
-    pub fn with_dns_config(
-        self,
-        cfg: libp2p_dns::ResolverConfig,
-        opts: libp2p_dns::ResolverOpts,
-    ) -> SwarmBuilder<
-        super::provider::AsyncStd,
-        WebsocketPhase<impl AuthenticatedMultiplexedTransport>,
-    > {
-        self.without_any_other_transports()
-            .with_dns_config(cfg, opts)
-    }
-}
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio", feature = "dns"))]
 impl<T: AuthenticatedMultiplexedTransport>
     SwarmBuilder<super::provider::Tokio, OtherTransportPhase<T>>

diff --git a/libp2p/src/builder/phase/quic.rs b/libp2p/src/builder/phase/quic.rs
@@ -149,22 +149,6 @@ impl<Provider, T: AuthenticatedMultiplexedTransport> SwarmBuilder<Provider, Quic
             .with_behaviour(constructor)
     }
 }
-#[cfg(all(not(target_arch = "wasm32"), feature = "async-std", feature = "dns"))]
-impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::AsyncStd, QuicPhase<T>> {
-    pub fn with_dns(
-        self,
-    ) -> Result<
-        SwarmBuilder<
-            super::provider::AsyncStd,
-            WebsocketPhase<impl AuthenticatedMultiplexedTransport>,
-        >,
-        std::io::Error,
-    > {
-        self.without_quic()
-            .without_any_other_transports()
-            .with_dns()
-    }
-}
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio", feature = "dns"))]
 impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::Tokio, QuicPhase<T>> {
     pub fn with_dns(
@@ -181,21 +165,6 @@ impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::Tokio,
             .with_dns()
     }
 }
-#[cfg(all(not(target_arch = "wasm32"), feature = "async-std", feature = "dns"))]
-impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::AsyncStd, QuicPhase<T>> {
-    pub fn with_dns_config(
-        self,
-        cfg: libp2p_dns::ResolverConfig,
-        opts: libp2p_dns::ResolverOpts,
-    ) -> SwarmBuilder<
-        super::provider::AsyncStd,
-        WebsocketPhase<impl AuthenticatedMultiplexedTransport>,
-    > {
-        self.without_quic()
-            .without_any_other_transports()
-            .with_dns_config(cfg, opts)
-    }
-}
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio", feature = "dns"))]
 impl<T: AuthenticatedMultiplexedTransport> SwarmBuilder<super::provider::Tokio, QuicPhase<T>> {
     pub fn with_dns_config(

diff --git a/transports/dns/CHANGELOG.md b/transports/dns/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.45.0
+
+- Removed `async_std` module [PR 5959](https://github.com/libp2p/rust-libp2p/pull/5959)
+
 ## 0.44.0
 
 - Report all transport errors in a dial attempt instead of only returning the last error. 

diff --git a/transports/dns/Cargo.toml b/transports/dns/Cargo.toml
@@ -3,15 +3,14 @@ name = "libp2p-dns"
 edition.workspace = true
 rust-version = { workspace = true }
 description = "DNS transport implementation for libp2p"
-version = "0.44.0"
+version = "0.45.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT"
 repository = "https://github.com/libp2p/rust-libp2p"
 keywords = ["peer-to-peer", "libp2p", "networking"]
 categories = ["network-programming", "asynchronous"]
 
 [dependencies]
-async-std-resolver = { workspace = true, features = ["system-config"], optional = true }
 async-trait = "0.1.80"
 futures = { workspace = true }
 libp2p-core = { workspace = true }
@@ -24,11 +23,9 @@ tracing = { workspace = true }
 [dev-dependencies]
 libp2p-identity = { workspace = true, features = ["rand"] }
 tokio = { workspace = true, features = ["rt", "time"] }
-async-std-crate = { package = "async-std", version = "1.6" }
 tracing-subscriber = { workspace = true, features = ["env-filter"] }
 
 [features]
-async-std = ["async-std-resolver"]
 tokio = ["hickory-resolver/tokio-runtime"]
 
 # Passing arguments to the docsrs builder in order to properly document cfg's.