Obelisk

Obelisk provides an easy way to develop and deploy your Reflex project as web apps and as mobile apps.

• Installing Obelisk
• Developing an Obelisk project
• Deploying
  • Locally
  • EC2
  • From macOS
  • Deploying an updated version
• Mobile
  • iOS
  • Android

Installing Obelisk

1. Install Nix. If you already have Nix installed, make sure you have version 2.0 or higher. To check your current version, run nix-env --version.
2. Set up nix caches
   1. If you are running NixOS, add this to /etc/nixos/configuration.nix:

      nix.binaryCaches = [ "https://cache.nixos.org/" "https://nixcache.reflex-frp.org" ];
      nix.binaryCachePublicKeys = [ "ryantrinkle.com-1:JJiAKaRv9mWgpVAz8dwewnZe0AzzEAzPkagE9SP5NWI=" ];
      

   2. If you are using another operating system or linux distribution, ensure that these lines are present in your Nix configuration file (/etc/nix/nix.conf on most systems; see full list):

      substituters = https://cache.nixos.org https://nixcache.reflex-frp.org
      trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= ryantrinkle.com-1:JJiAKaRv9mWgpVAz8dwewnZe0AzzEAzPkagE9SP5NWI=
      

      • other Linux: enable sandboxing (see these issue172 or issue6 if you run into build problems)

        sandbox = true
        

      • MacOS: disable sandboxing (there are still some impure dependencies for now)

        sandbox = false
        

        then restart the nix daemon

        sudo launchctl stop org.nixos.nix-daemon
        sudo launchctl start org.nixos.nix-daemon
        

3. Install obelisk: nix-env -f https://github.com/obsidiansystems/obelisk/archive/master.tar.gz -iA command

Contributing to Obelisk

When developing on obelisk itself you may launch ghcid for the corresponding project as follows. For example to launch ghcid for lib/backend project:

nix-shell -A obeliskEnvs.obelisk-backend --run "cd lib/backend && ghcid -c 'cabal new-repl'"

Or to launch ghcid for lib/command project:

nix-shell -A obeliskEnvs.obelisk-command --run "cd lib/command && ghcid -c 'cabal new-repl'"

Accessing private repositories

To allow the Nix builder to access private git repositories, you must be set up to access them via SSH. Follow these steps depending on the platform you need access to:

• GitHub
• GitLab

Developing an Obelisk project

To create a new Obelisk project, go to an empty directory and run:

ob init

Obelisk leverages ghcid to provide a live-reloading server that handles both frontend and backend. To run your Obelisk app and monitor the source for changes:

ob run

Now go to http://localhost:8000 (or the port specified in config/common/route) to access your app.

Every time you change the Haskell source files in frontend, common or backend, ob run will automatically recompile the modified files and reload the server. Furthermore, it will display on screen compilation errors and warnings if any.

Deploying

Locally

Build everything:

nix-build -A exe -o result-exe

Run the server:

cd result-exe
./backend

EC2

In this section we will demonstrate how to deploy your Obelisk app to an Amazon EC2 instance.

First create a new EC2 instance:

1. Launch a NixOS 17.09 EC2 instance (we recommend this AMI)
2. In the instance configuration wizard ensure that your instance has at least 1GB RAM and 10GB disk space.
3. When prompted save your AWS private key (~/myaws.pem) somewhere safe. We'll need it later during deployment.
4. Go to "Security Groups", select your instance's security group and under "Inbound" tab add a new rule for HTTP port 80 and 443.

At this stage your instance should be booting and become accessible shortly. Note down the hostname of your EC2 instance.

Now go to your Obelisk project directory (~/code/myapp), and initialize a deployment config (~/code/myapp-deploy): Your project directory must be "thunkable", i.e. something on which ob thunk pack can be called. Usually it will be a git repository whose current revision has been pushed upstream.

cd ~/code/myapp
SERVER=ec2-35-183-22-197.ca-central-1.compute.amazonaws.com
ROUTE=https://myapp.com   # Publicly accessible route to your app
EMAIL=myname@myapp.com
ob deploy init \
  --ssh-key ~/myaws.pem \
  --hostname $SERVER \
  --route $ROUTE \
  --admin-email $EMAIL \
  ~/code/myapp-deploy

NOTE: HTTPS is enabled by default; to disable https, pass --disable-https to the ob deploy init command above.

Then go to that created deployment configuration directory, and initiate the deployment:

cd ~/code/myapp-deploy
ob deploy push

ob deploy push will locally build your app and then transfer it, along with all the Nix package dependencies, via ssh to the EC2 instance. The backend will live in /var/lib/backend.

At this point you are done. Your app will be accessible at ${ROUTE}. The currently deployed version - the git commit hash of the source repo - can be found at ${ROUTE}/version.

From macOS

Deploying from macOS requires some extra setup:

• Install nix-darwin
• Install docker

Running ob deploy push will give you additional setup instructions.

Deploying an updated version

If you'd like to deploy an updated version (with new commits) of your Obelisk app: simply go to the configuration directory, update the source thunk and push:

cd ~/code/myapp-deploy
ob deploy update
ob deploy push

Mobile

Until Obelisk offers a ob deploy equivalent for mobile apps, you are recommended to do it manually as follows.

iOS

First time setup

Development on iOS requires a computer running macOS and an iOS developer account. Your account must also belong to an Apple Developer Team, if you want to access developer portal links (otherwise they'll redirect to your account page).

iPhone

1. Connect the iPhone on which you'd like to run builds - this will open up iTunes.
2. Click accept to authorize on both the computer and the iPhone.

Xcode

Install Xcode 8.2 (contains iOS SDK 10.2) and open it so that it runs its post install tool setup.

These versions will work out of the box but iOS SDKs prior to 11.3 should also work. You can choose another installed version in default.nix

More recent Xcodes should also work, as long as one of the SDKs mentioned above has been used. To add another SDK to your current Xcode, download the corresponding Xcode, extract it and copy its SDK folder next to the installed one, e.g.

open -W Xcode_9.2.xip
sudo cp -R Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.2.sdk

You can verify that you have correct versions by running

xcodebuild -showsdks

Certificates

To deploy and/or package apps, you'll need to inform Apple of your development devices and permissions by adding credentials to the correct provisioning profile via the Apple Developer portal.

1. Open up XCode and go to Preferences - Accounts. Select the organization Member role, click Manage Certificates, and add an iOS Development certificate.
2. Go to developer portal - devices and add your device. To find your device's UDID, select it in iTunes and click the serial number.
3. Go to developer portal - development profiles. Create a development profile and add your certificate and device. Click "Generate" and then download and open the profile.

Building

1. In your project's default.nix set values for ios.bundleIdentifier and ios.bundleName. Ensure that bundleIdentifier matches the App ID of the development profile, or that you are using a wildcard profile.
2. Run nix-build -A ios.frontend -o result-ios to build the app. Find it at result-ios/frontend.app

Deploying

1. Connect the registered iPhone.
2. Find your Apple Team ID in the developer portal.
3. Run the deploy command with your Team ID:

result-ios/bin/deploy [TEAM_ID]
# or in debug mode via lldb:
result-ios/bin/deploy [TEAM_ID] -d

Packaging

1. Go to developer portal - distribution profiles. Create and download a distribution profile.
2. Run the package script with your TEAM ID and your distribution profile to create a .ipa:

result-ios/bin/package [TEAM_ID] /path/to/output/.ipa /path/to/profile/file

Debugging

It's also possible to inspect iOS WkWebView apps once they are installed in the iPhone:

1. On the desktop, go to Safari > Preferences > Advanced and enable Develop menu.
2. On the iPhone go to Settings > Safari > Advanced and enable Web Inspector.
3. Open the app on the iPhone while it is connected to the desktop.
4. In the desktop's Safari Develop menu, you should see your iPhone. Select the screen under the name of the app.

Android

1. In your project's default.nix set a suitable value for android.applicationId and android.displayName.
2. Run nix-build -A android.frontend -o result-android to build the Android app.
3. A debug version of the app should be generated at result-android/android-app-debug.apk

Now deploy the built apk file to your Android device:

1. Enable USB debugging in your Android device (instructions here)
2. Connect the device using USB (be sure to confirm any security prompts on the device)
3. Run the deploy script: result-android/bin/deploy

Alternatively, you can deploy from an obelisk deployment directory (a directory generated post ob deploy init ... command) using the ob deploy test android command. This command will accomplish the following:

1. Create a key store and apk signing key (android_keystore.jks)
2. Build a Signed Android apk for your application
3. Deploy the Signed apk to your connected Android device

In the event that you change your key or keystore password, you will have to update your credentials within the JSON object found in android_keytool_config.json

Additional documentation on java key stores can be found [here] (https://docs.oracle.com/javase/8/docs/technotes/tools/unix/keytool.html)

This should copy over and install the application on your device (if you see a "signatures do not match" error, simply uninstall the previous app from the device before retrying the deploy). The name of the installed application will be what you have specified for android.displayName in the default.nix.

Releasing to Play Store

Build a release version

After having configured signing for your app, you may proceed to build a release version of the app. This is no different to how you build the non-release version, so consult the section Android further above for exact instructions on building and deploying to your device.