Add support for NIOTransportServices (#107)

* Start using NIOTS

* Require watchOS 6

* Use MultiThreadedEventLoopGroup in all cases for EventLoopGroupProvider.createNew

* Update Package.swift

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

Co-authored-by: Gwynne Raskind <gwynne@darkrainfall.org>

Author: PopFlamingo

Package.swift

@@ -4,15 +4,17 @@ import PackageDescription
 let package = Package(
     name: "websocket-kit",
     platforms: [
-       .macOS(.v10_15),
-       .iOS(.v11)
+        .macOS(.v10_15),
+        .iOS(.v13),
+        .tvOS(.v13),
     ],
     products: [
         .library(name: "WebSocketKit", targets: ["WebSocketKit"]),
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-nio.git", from: "2.33.0"),
         .package(url: "https://github.com/apple/swift-nio-ssl.git", from: "2.14.0"),
+        .package(url: "https://github.com/apple/swift-nio-transport-services.git", from: "1.11.4"),
     ],
     targets: [
         .target(name: "WebSocketKit", dependencies: [
@@ -23,6 +25,7 @@ let package = Package(
             .product(name: "NIOHTTP1", package: "swift-nio"),
             .product(name: "NIOSSL", package: "swift-nio-ssl"),
             .product(name: "NIOWebSocket", package: "swift-nio"),
+            .product(name: "NIOTransportServices", package: "swift-nio-transport-services"),
         ]),
         .testTarget(name: "WebSocketKitTests", dependencies: [
             .target(name: "WebSocketKit"),

Sources/WebSocketKit/WebSocketClient.swift

@@ -4,6 +4,7 @@ import NIOConcurrencyHelpers
 import NIOHTTP1
 import NIOWebSocket
 import NIOSSL
+import NIOTransportServices
 
 public final class WebSocketClient {
     public enum Error: Swift.Error, LocalizedError {
@@ -60,7 +61,7 @@ public final class WebSocketClient {
     ) -> EventLoopFuture<Void> {
         assert(["ws", "wss"].contains(scheme))
         let upgradePromise = self.group.next().makePromise(of: Void.self)
-        let bootstrap = ClientBootstrap(group: self.group)
+        let bootstrap = WebSocketClient.makeBootstrap(on: self.group)
             .channelOption(ChannelOptions.socket(SocketOptionLevel(IPPROTO_TCP), TCP_NODELAY), value: 1)
             .channelInitializer { channel in
                 let httpHandler = HTTPInitialRequestHandler(
@@ -141,6 +142,20 @@ public final class WebSocketClient {
             }
         }
     }
+    
+    private static func makeBootstrap(on eventLoop: EventLoopGroup) -> NIOClientTCPBootstrapProtocol {
+        #if canImport(Network)
+        if let tsBootstrap = NIOTSConnectionBootstrap(validatingGroup: eventLoop) {
+            return tsBootstrap
+        }
+       #endif
+
+       if let nioBootstrap = ClientBootstrap(validatingGroup: eventLoop) {
+           return nioBootstrap
+       }
+
+       fatalError("No matching bootstrap found")
+    }
 
     deinit {
         switch self.eventLoopGroupProvider {