Swiftpack.co - Package - snorthov/swift-helloworld

Build Status - Master macOS Linux

Swift HelloWorld App Overview

This project contains a simple Swift hello world application that can be deployed to the IBM Cloud or run locally on your macOS or Ubuntu Linux system. This sample application creates a basic server that returns an HTML greeting to the client. Please note that this is not a production-ready application. Instead, it is for educational purposes to learn about the types of applications you can develop using the Swift programming language.

Application Requirements

To compile and run this sample application on your system, you need to install the Swift compiler for your platform. Please note that the Swift language is evolving and changing rapidly. The latest version of this Swift application works with the 5.1+ version of the Swift binaries. You can download this version of the Swift binaries by following this link.

If you are interested in manually deploying the application to the IBM Cloud, you'd need to install the IBM Cloud command line on your system. Once it is installed, you can use it to authenticate and access your IBM Cloud organizations and spaces. You can find further details on how to deploy this sample application to the IBM Cloud in the following sections.

Run the app locally

Once you have installed the Swift compiler and cloned this Git repo, you can now compile and run the application. Go to the root folder of this repo on your system and issue the following command:

$ swift build

You should see an output similar to the following:

Compile Swift Module 'LoggerAPI' (1 sources)
Compile Swift Module 'Socket' (3 sources)
Compile Swift Module 'HeliumLogger' (2 sources)
Compile Swift Module 'Configuration' (7 sources)
Compile Swift Module 'CloudFoundryEnv' (5 sources)
Compile Swift Module 'HerokuConfig' (1 sources)
Compile Swift Module 'CloudFoundryConfig' (2 sources)
Compile Swift Module 'AmazonConfig' (1 sources)
Compile Swift Module 'Utils' (2 sources)
Compile Swift Module 'Server' (1 sources)
Linking ./.build/debug/Server

Once the application is successfully compiled, you can run the executable that was generated by the Swift compiler:

$ swift run

You should see an output similar to the following:

Server is listening on port: 8080

To connect to the server, you can use the browser of your preference (e.g. Firefox, Chrome, etc.) to point to the following URL: http://<hostname>:8080/, where <hostname> is the hostname or the IP address of the system where you are running the sample app. If the browser is running on the same system, you can use localhost as the value for the hostname. After you access the server, the browser should render an HTML page with the following message:

Hello from Swift on Linux!

Below the greeting message, you should also see an HTML table that displays the environment variables for the app.

Running the app on the IBM Cloud

Using the magical button

Click the magical button below to automatically deploy this sample application to the IBM Cloud.

Deploy to IBM Cloud

When automatically deploying to the IBM Cloud, the manifest.yml file [included in the repo] is parsed to obtain the name of the application. For further details on the structure of the manifest.yml file, see the Cloud Foundry documentation.

Using the IBM Cloud command line

You can also manually deploy the app to the IBM Cloud. Though not as magical as using the IBM Cloud button above, manually deploying the app gives you some insights about what is happening behind the scenes. Remember that you'd need the IBM Cloud command line installed on your system to deploy the app to the IBM Cloud.

Using the IBM Cloud command line you can get a list of the buildpacks (along with their versions) that are installed on the IBM Cloud.

ibmcloud cf buildpacks

Executing the above command should result in output similar to the following:

Getting buildpacks...

buildpack                                         position   enabled   locked   filename                                               stack
liberty-for-java                                  1          true      false    buildpack_liberty-for-java_v3.36-20190905-1704.zip
sdk-for-nodejs                                    2          true      false    buildpack_sdk-for-nodejs_v4.0-20190912-1615.zip
dotnet-core                                       3          true      false    buildpack_dotnet-core_v2.4-20190912-1554.zip
swift_buildpack                                   4          true      false    buildpack_swift_v2.1.1-20190821-1903.zip
noop-buildpack                                    5          true      false    noop-buildpack-20140311-1519.zip
xpages_buildpack                                  6          true      false    xpages_buildpack_v1.2.2-20170112-1328.zip
liberty-for-java_v3_17_1-20180131-1532            7          true      false    buildpack_liberty-for-java_v3.17.1-20180131-1532.zip
liberty_v3_14-20171013-1023                       8          true      false    buildpack_liberty_v3.14-20171013-1023.zip
swift_buildpack_v2_0_18-20190303-1915             9          true      false    buildpack_swift_v2.0.18-20190303-1915.zip
swift_buildpack_v2_0_20-20190401-2122             10         true      false    buildpack_swift_v2.0.20-20190401-2122.zip
staticfile_buildpack                              11         true      false    staticfile-buildpack-cflinuxfs3-v1.4.35.zip            cflinuxfs3
java_buildpack                                    12         true      false    java-buildpack-cflinuxfs3-v4.16.1.zip                  cflinuxfs3
ruby_buildpack                                    13         true      false    ruby-buildpack-cflinuxfs3-v1.7.27.zip                  cflinuxfs3
nodejs_buildpack                                  14         true      false    nodejs-buildpack-cflinuxfs3-v1.6.34.zip                cflinuxfs3
go_buildpack                                      15         true      false    go-buildpack-cflinuxfs3-v1.8.29.zip                    cflinuxfs3
python_buildpack                                  16         true      false    python-buildpack-cflinuxfs3-v1.6.23.zip                cflinuxfs3
php_buildpack                                     17         true      false    php-buildpack-cflinuxfs3-v4.3.64.zip                   cflinuxfs3
binary_buildpack                                  18         true      false    binary-buildpack-cflinuxfs3-v1.0.27.zip                cflinuxfs3
swift_buildpack_cflinuxfs3_v2_1_0-20190404-1206   19         true      false    buildpack_swift_cflinuxfs3_v2.1.0-20190404-1206.zip    cflinuxfs3
liberty-for-java_v3_35-20190813-1755              20         true      false    buildpack_liberty-for-java_v3.35-20190813-1755.zip
liberty-for-java_v3_36-20190905-1704              21         true      false    buildpack_liberty-for-java_v3.36-20190905-1704.zip
dotnet-core_v2_3-20190609-2145                    22         true      false    buildpack_dotnet-core_v2.3-20190609-2145.zip
dotnet-core_v2_4-20190912-1554                    23         true      false    buildpack_dotnet-core_v2.4-20190912-1554.zip
sdk-for-nodejs_v3_28-20190722-1336                24         true      false    buildpack_sdk-for-nodejs_v3.28-20190722-1336.zip
sdk-for-nodejs_v4_0-20190912-1615                 25         true      false    buildpack_sdk-for-nodejs_v4.0-20190912-1615.zip

Looking at the output above, we can see that the Swift buildpack (v2.1.0) is installed on the IBM Cloud. This will allow a seamless deployment of the starter application to the IBM Cloud. After you have cloned this Git repo, go to its root folder on your system and issue the following command:

ibmcloud app push

Executing the IBM Cloud push command will parse the contents of the manifest.yml file and upload the application to the IBM Cloud. The following is example output from executing the ibmcloud app push command on the Swift 5.0 version of this application:

Using manifest file /Users/gvalenc/git/DevX/swift-helloworld/manifest.yml
Getting app info...
Creating app with these attributes...
+ name:         swift-helloworld-swift51
  path:         /Users/gvalenc/git/DevX/swift-helloworld
  buildpacks:
+   https://github.com/IBM-Swift/swift-buildpack#2.2.0
+ instances:    1
+ memory:       128M
  routes:
+   swift-helloworld-swift51-shiny-lemur.mybluemix.net

Creating app swift-helloworld-swift51...
Mapping routes...
Comparing local files to remote cache...
Packaging files to upload...
Uploading files...
 14.73 KiB / 14.73 KiB [==================================================================================] 100.00% 1s

Waiting for API to complete processing files...

Staging app and tracing logs...
   Cell ca3309ff-c7c4-4aaf-b47e-3ef8e1e2e07f creating container for instance 880e2117-2039-4b9d-9eb2-00c5a0f1689f
   Cell ca3309ff-c7c4-4aaf-b47e-3ef8e1e2e07f successfully created container for instance 880e2117-2039-4b9d-9eb2-00c5a0f1689f
   Downloading app package...
   Downloaded app package (14.7K)
   -----> Buildpack version 2.2.0
   -----> Default supported Swift version is 5.1
   -----> Configure for apt-get installs...
   -----> Writing profile script...
   -----> Copying deb files to installation folder...
   -----> No Aptfile found.
   -----> Getting swift-5.1
          Downloaded swift-5.1
   -----> Unpacking swift-5.1.tar.gz
   -----> Getting clang-8.0.0
          Downloaded clang-8.0.0
   -----> Unpacking clang-8.0.0.tar.xz
   -----> .ssh directory and config file not found.
   -----> Skipping cache restore (new swift signature)
   -----> Fetching Swift packages and parsing Package.swift files...
          Fetching https://github.com/apple/swift-log.git
          Fetching https://github.com/IBM-Swift/CloudEnvironment.git
          Fetching https://github.com/IBM-Swift/LoggerAPI.git
          Fetching https://github.com/IBM-Swift/Configuration.git
          Fetching https://github.com/IBM-Swift/BlueSocket.git
          Fetching https://github.com/IBM-Swift/HeliumLogger.git
          Fetching https://github.com/IBM-Swift/Swift-cfenv.git
          Fetching https://github.com/IBM-Swift/FileKit.git
   Completed resolution in 19.21s
          Cloning https://github.com/IBM-Swift/Swift-cfenv.git
          Resolving https://github.com/IBM-Swift/Swift-cfenv.git at 6.0.3
          Cloning https://github.com/IBM-Swift/BlueSocket.git
          Resolving https://github.com/IBM-Swift/BlueSocket.git at 1.0.49
          Cloning https://github.com/apple/swift-log.git
          Resolving https://github.com/apple/swift-log.git at 1.1.1
          Cloning https://github.com/IBM-Swift/FileKit.git
          Resolving https://github.com/IBM-Swift/FileKit.git at 0.0.2
          Cloning https://github.com/IBM-Swift/LoggerAPI.git
          Resolving https://github.com/IBM-Swift/LoggerAPI.git at 1.9.0
          Cloning https://github.com/IBM-Swift/CloudEnvironment.git
          Resolving https://github.com/IBM-Swift/CloudEnvironment.git at 9.1.0
          Cloning https://github.com/IBM-Swift/HeliumLogger.git
          Resolving https://github.com/IBM-Swift/HeliumLogger.git at 1.9.0
          Cloning https://github.com/IBM-Swift/Configuration.git
          Resolving https://github.com/IBM-Swift/Configuration.git at 3.0.4
   -----> No additional packages to download.
   -----> Skipping installation of App Management (debug)
   -----> Installing system level dependencies...
   -----> Building Package...
   -----> Build config: release
          [1/3] Compiling Logging Locks.swift
          [2/4] Compiling LoggerAPI Logger.swift
          [3/6] Compiling FileKit FileKit.swift
          [4/7] Compiling HeliumLogger HeliumLogHandler.swift
          [5/7] Compiling Configuration ConfigurationManager.swift
          [6/8] Compiling Socket Socket.swift
          [7/8] Compiling CloudFoundryEnv App.swift
          [8/9] Compiling CloudEnvironment AlertNotificationCredentials.swift
          [9/10] Compiling Utils HttpResponse.swift
          [10/11] Compiling Server main.swift
          [11/11] Linking Server
   -----> Bin path: /tmp/app/.build/x86_64-unknown-linux/release
   -----> Copying dynamic libraries
   -----> Copying binaries to 'bin'
   -----> Clearing previous swift cache
   -----> Skipping cache save (disabled by default)
   -----> Optimizing contents of cache folder...
   Exit status 0
   Uploading droplet, build artifacts cache...
   Uploading droplet...
   Uploading build artifacts cache...
   Uploaded build artifacts cache (1.6K)
   Uploaded droplet (221.5M)
   Uploading complete
   Cell ca3309ff-c7c4-4aaf-b47e-3ef8e1e2e07f stopping instance 880e2117-2039-4b9d-9eb2-00c5a0f1689f
   Cell ca3309ff-c7c4-4aaf-b47e-3ef8e1e2e07f destroying container for instance 880e2117-2039-4b9d-9eb2-00c5a0f1689f
   Cell ca3309ff-c7c4-4aaf-b47e-3ef8e1e2e07f successfully destroyed container for instance 880e2117-2039-4b9d-9eb2-00c5a0f1689f

Waiting for app to start...

name:              swift-helloworld-swift51
requested state:   started
routes:            swift-helloworld-swift51-shiny-lemur.mybluemix.net
last uploaded:     Mon 30 Sep 09:24:42 CDT 2019
stack:             cflinuxfs3
buildpacks:        https://github.com/IBM-Swift/swift-buildpack#2.2.0

type:            web
instances:       1/1
memory usage:    128M
start command:   Server
     state     since                  cpu    memory        disk       details
#0   running   2019-09-30T14:25:23Z   1.5%   36K of 128M   8K of 1G

Once the sample application is pushed to the IBM Cloud, you can access it using its route. You can log on to your IBM Cloud account to find the route of your application or you can inspect the output from the execution of the ibmcloud app push command. The string value (e.g. swift-helloworld.mybluemix.net) shown next to the urls should contain the route. Use that route as the URL to access the sample server using the browser of your choice. The browser should render an HTML page with the following message at the top:

Hello from Swift on Linux!

Using a different version of Swift on IBM Cloud for your application

If you look closely at the output above returned by the ibmcloud app push command, you will notice that 5.1 was the Swift version used for compiling and running the sample app on the IBM Cloud. If you have a Swift application that compiles with a different version of the Swift binaries, say DEVELOPMENT-SNAPSHOT-2016-08-30-a, you'd need to update the contents of the .swift-version file to:

DEVELOPMENT-SNAPSHOT-2016-08-30-a

After updating the .swift-version file, you can run the ibmcloud app push command to push your application to IBM Cloud and use the specified version of the Swift binaries for compiling and running your application.

For a complete list of the Swift versions currently supported and cached by the Swift buildpack for IBM Cloud, see the buildpack's manifest file. If you cannot find the version of the Swift binaries you are looking for in this file, then that version is not currently supported in the cache.

Running the application in an IBM Container on the IBM Cloud

This sample application can also be run in an IBM Container on the IBM Cloud. For details on how to do this, see 10 Steps To Running a Swift App in an IBM Container. In this blog post, you will find the necessary steps for creating an IBM Container that executes this starter application.

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