Swift in the Cloud

Leigh Williamson is a technical leader in the IBM Cloud team who aids clients with cloud computing strategy and execution.

John Ponzo is an IBM Fellow and the primary technical collaborator between Apple and IBM in refining Swift for both mobile client and cloud services development.

Patrick Bohrer is technical lead for IBM's global efforts around Swift@IBM Engineering.

Ricardo Olivieri is an expert in the adoption of the Swift language on the server and the IBM cloud.

Karl Weinmeister helped extend Swift from its mobile roots to become a full-stack language ecosystem.

Samuel Kallner is technical lead of the Kitura project at the IBM Research Lab in Haifa, Israel.

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