Adopt `Sendable` (#155)

* Adopt `Sendable`

* Workaround Swift 5.4 compiler bug

Package.swift

@@ -21,7 +21,7 @@ let package = Package(
         .library(name: "NIOTransportServices", targets: ["NIOTransportServices"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-nio.git", from: "2.32.0"),
+        .package(url: "https://github.com/apple/swift-nio.git", from: "2.41.1"),
         .package(url: "https://github.com/apple/swift-atomics.git", from: "1.0.2"),
         .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
     ],

Sources/NIOTransportServices/NIOFilterEmptyWritesHandler.swift

@@ -85,6 +85,11 @@ public final class NIOFilterEmptyWritesHandler: ChannelDuplexHandler {
     }
 }
 
+#if swift(>=5.6)
+@available(*, unavailable)
+extension NIOFilterEmptyWritesHandler: Sendable {}
+#endif
+
 // Connection state management
 extension NIOFilterEmptyWritesHandler {
     public func channelActive(context: ChannelHandlerContext) {

Sources/NIOTransportServices/NIOTSChannelOptions.swift

@@ -13,7 +13,11 @@
 //===----------------------------------------------------------------------===//
 #if canImport(Network)
 import NIOCore
+#if swift(>=5.6)
+@preconcurrency import Network
+#else
 import Network
+#endif
 
 /// Options that can be set explicitly and only on bootstraps provided by `NIOTransportServices`.
 @available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)

Sources/NIOTransportServices/NIOTSConnectionBootstrap.swift

@@ -238,6 +238,11 @@ public final class NIOTSConnectionBootstrap {
     }
 }
 
+#if swift(>=5.6)
+@available(*, unavailable)
+extension NIOTSConnectionBootstrap: Sendable {}
+#endif
+
 @available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
 extension NIOTSConnectionBootstrap: NIOClientTCPBootstrapProtocol {
     /// Apply any understood shorthand options to the bootstrap, removing them from the set of options if they are consumed.

Sources/NIOTransportServices/NIOTSEventLoopGroup.swift

@@ -120,3 +120,8 @@ public struct NIOTSClientTLSProvider: NIOClientTLSProvider {
     }
 }
 #endif
+
+#if swift(>=5.5) && canImport(_Concurrency) && canImport(Network)
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSEventLoopGroup: @unchecked Sendable {}
+#endif

Sources/NIOTransportServices/NIOTSListenerBootstrap.swift

@@ -346,7 +346,6 @@ public final class NIOTSListenerBootstrap {
     }
 }
 
-
 @available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
 private class AcceptHandler: ChannelInboundHandler {
     typealias InboundIn = NIOTSConnectionChannel

Sources/NIOTransportServices/NIOTSListenerChannel.swift

@@ -130,7 +130,6 @@ internal final class NIOTSListenerChannel {
     }
 }
 
-
 // MARK:- NIOTSListenerChannel implementation of Channel
 @available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
 extension NIOTSListenerChannel: Channel {
@@ -495,3 +494,8 @@ extension NIOTSListenerChannel {
     }
 }
 #endif
+
+#if swift(>=5.5) && canImport(_Concurrency) && canImport(Network)
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSListenerChannel: @unchecked Sendable {}
+#endif

Sources/NIOTransportServices/NIOTSNetworkEvents.swift

@@ -13,14 +13,18 @@
 //===----------------------------------------------------------------------===//
 
 #if canImport(Network)
+#if swift(>=5.6)
+@preconcurrency import Network
+#else
 import Network
+#endif
 import NIOCore
 
 /// A tag protocol that can be used to cover all network events emitted by `NIOTransportServices`.
 ///
 /// Users are strongly encouraged not to conform their own types to this protocol.
 @available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
-public protocol NIOTSNetworkEvent: Equatable { }
+public protocol NIOTSNetworkEvent: Equatable, NIOPreconcurrencySendable { }
 
 @available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
 public enum NIOTSNetworkEvents {
@@ -98,4 +102,20 @@ public enum NIOTSNetworkEvents {
         }
     }
 }
+
+#if swift(>=5.6)
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSNetworkEvents.BetterPathAvailable: Sendable {}
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSNetworkEvents.BetterPathUnavailable: Sendable {}
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSNetworkEvents.PathChanged: Sendable {}
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSNetworkEvents.ConnectToNWEndpoint: Sendable {}
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSNetworkEvents.BindToNWEndpoint: Sendable {}
+@available(OSX 10.14, iOS 12.0, tvOS 12.0, watchOS 6.0, *)
+extension NIOTSNetworkEvents.WaitingForConnectivity: Sendable {}
+#endif
+
 #endif