externalize version number

Author: sebsto

Sources/AWSLambdaRuntime/ControlPlaneRequestEncoder.swift

@@ -93,7 +93,7 @@ struct ControlPlaneRequestEncoder: _EmittingChannelHandler {
 extension String {
     static let CRLF: String = "\r\n"
 
-    static let userAgent = "Swift-Lambda/2.0"
+    static let userAgent = "Swift-Lambda/\(Version.current)"
     static let userAgentHeader: String = "user-agent: \(userAgent)\r\n"
     static let unhandledErrorHeader: String = "lambda-runtime-function-error-type: Unhandled\r\n"
 

Sources/AWSLambdaRuntime/Version.swift

@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftAWSLambdaRuntime open source project
+//
+// Copyright (c) 2017-2018 Apple Inc. and the SwiftAWSLambdaRuntime project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftAWSLambdaRuntime project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+/// Library version of the AWS Lambda Runtime.
+/// This is used in the User Agent header when making requests to the AWS Lambda data Plane.
+package enum Version {
+		/// The current version of the AWS Lambda Runtime.
+		public static let current = "2.0"
+}