Fix compilation for with-dns-sd

Cargo.lock

@@ -1303,6 +1303,7 @@ dependencies = [
  "byteorder",
  "bytes",
  "chrono",
+ "dns-sd",
  "env_logger",
  "form_urlencoded",
  "futures-core",

Cargo.toml

@@ -72,7 +72,7 @@ rodiojack-backend = ["librespot-playback/rodiojack-backend"]
 sdl-backend = ["librespot-playback/sdl-backend"]
 gstreamer-backend = ["librespot-playback/gstreamer-backend"]
 
-with-dns-sd = ["librespot-discovery/with-dns-sd"]
+with-dns-sd = ["librespot-core/with-dns-sd", "librespot-discovery/with-dns-sd"]
 
 default = ["rodio-backend"]
 

core/Cargo.toml

@@ -18,6 +18,7 @@ base64 = "0.13"
 byteorder = "1.4"
 bytes = "1"
 chrono = "0.4"
+dns-sd = { version = "0.1.3", optional = true }
 form_urlencoded = "1.0"
 futures-core = { version = "0.3", default-features = false }
 futures-util = { version = "0.3", default-features = false, features = ["alloc", "bilock", "sink", "unstable"] }
@@ -61,3 +62,6 @@ vergen = "3.0.4"
 [dev-dependencies]
 env_logger = "0.8"
 tokio = { version = "1.0", features = ["macros", "parking_lot"] }
+
+[features]
+with-dns-sd = ["dns-sd"]

core/src/error.rs

@@ -12,6 +12,9 @@ use thiserror::Error;
 use tokio::sync::{mpsc::error::SendError, oneshot::error::RecvError};
 use url::ParseError;
 
+#[cfg(feature = "with-dns-sd")]
+use dns_sd::DNSError;
+
 #[derive(Debug)]
 pub struct Error {
     pub kind: ErrorKind,
@@ -283,6 +286,13 @@ impl From<DecodeError> for Error {
     }
 }
 
+#[cfg(feature = "with-dns-sd")]
+impl From<DNSError> for Error {
+    fn from(err: DNSError) -> Self {
+        Self::new(ErrorKind::Unavailable, err)
+    }
+}
+
 impl From<http::Error> for Error {
     fn from(err: http::Error) -> Self {
         if err.is::<InvalidHeaderName>()

discovery/Cargo.toml

@@ -11,6 +11,7 @@ edition = "2018"
 aes-ctr = "0.6"
 base64 = "0.13"
 cfg-if = "1.0"
+dns-sd = { version = "0.1.3", optional = true }
 form_urlencoded = "1.0"
 futures-core = "0.3"
 futures-util = "0.3"
@@ -24,8 +25,6 @@ sha-1 = "0.9"
 thiserror = "1.0"
 tokio = { version = "1.0", features = ["parking_lot", "sync", "rt"] }
 
-dns-sd = { version = "0.1.3", optional = true }
-
 [dependencies.librespot-core]
 path = "../core"
 default_features = false