Swift in the Cloud

Introduction xxiii 1 Swift.org, the Open Source Project 1 What's Included 1 Source Code Repositories 2 How to Get Involved 5 Mailing Lists 7 Bug Tracking 8 Swift Evolution and Roadmap 12 Priorities for the Swift 4.0 Major Release 14 Binary Downloads 14 MacOS Binaries 15 Linux Binaries 16 Swiftenv, Swift Version Manager 17 Summary 17 2 A Swift Sandbox in the Cloud 19 The IBM Cloud Platform 19 Getting Started 26 Sign Me Up!. 26 Saving and Sharing Code Samples 28 Selecting Swift Versions and More 30 Have You Run on a Mainframe Lately? 30 IBM Swift Package Catalog and Sandbox 32 Summary 33 3 A Basic Introduction to Swift 35 Background 35 Let's Get Coding! 35 Swift Standard Library 35 Swift Foundation Library 37 C Library Interoperability 39 Concurrency Library 41 Memory Management 43 The Language Landscape 48 Language Groupings 48 Language Timeline 50 Summary 51 4 The IBM Bluemix Buildpack for Swift 53 Cloud Foundry Buildpacks 53 Buildpack Phases 54 Working with the IBM Bluemix Buildpack for Swift 55 Where Is the Source Code Hosted? 55 What Version of the Buildpack Is Currently Installed? 56 File Artifacts Required for Provisioning Your Application on Bluemix 58 Installing Additional System-Level Dependencies 61 Downloading Closed Source Dependencies 68 Examples of Using the IBM Bluemix Buildpack for Swift 69 Swift HelloWorld 69 Kitura Starter 74 BluePic 77 Using the Latest Code of the IBM Bluemix Buildpack for Swift 87 Summary 88 5 Using Containers on Bluemix to Run Swift Code 91 What Are Docker Containers? 91 Docker Images for Swift 92 Installing Docker. 93 Using Docker as a Development Tool 94 Exposing Your Swift Application's Port to the Host System 96 Using docker-compose 96 Why Use Containers on Bluemix? 98 Containers for Packaging and Deployment of Swift Applications 99 The Kubernetes Platform 99 Running Your Docker Image in the Bluemix Cloud 100 Install the Kubernetes Command Line 100 Install the Bluemix Command Line. 100 Install the IBM Container Registry Plug-In 102 Install the IBM Container Service Plug-In 102 Create a Runtime Image for Swift Applications 103 Tag a Docker Image 106 Push a Docker Image to Bluemix 107 Create a Kubernetes Cluster on Bluemix 108 High Availability in Kubernetes Clusters 112 Binding Bluemix Services to IBM Containers. 113 Summary 116 6 Swift Package Management 119 Swift Package Manager 119 Using Swift Package Manager 120 Commands 121 Package.Swift Details 123 Swift Package Catalog 123 Browsing 123 Searching 124 Package Details 126 Dependency Visualization 127 Trying Out a Package in the Sandbox 128 Summary 130 7 Swift and Kitura for Web Applications 131 Kitura 133 Sending Simple Responses to Requests 136 A Real-World Library Example 137 Accessing Information Sent in Requests 138 Starting the Library Application 140 Working with Various HTTP Features Using Kitura 149 Other Ways of Serving Content Using Kitura 155 Other Useful Kitura Middleware 157 Authentication Using the Kitura-Credentials Framework 159 The Library Sample with Authentication 160 Kitura and Data Access 163 Swift-Kuery 163 Kitura-redis 170 Summary 173 8 Serverless Programming with Swift 175 Microservices and Serverless Computing 175 Serverless Computing Concepts 177 OpenWhisk 179 Swift and OpenWhisk 182 Using the Web-Based OpenWhisk Tools 183 Command Line OpenWhisk 189 A More Involved Example 195 Summary 201 9 Over the Horizon: Where Do We Go from Here? 203 Bringing Swift to the Server 203 IBM Cloud Tools for Swift 204 Server-Side Frameworks 210 Expanding the Range of Swift 215 Swift Support for Linux 215 The Internet of Swift Things 215 Big Iron Swift 216 Swift DevOps 218 Summary 219 Index 221