A Java-based example app for Akka Serverless
Features include:
- Customer locations with wireless mesh devices
- Connectivity to Google Cloud Pubsub
To help you get started with Akka Serverless, we've built some example apps that showcase the capabilities of the platform. This example application mimics a company that uses Akka Serverless to keep track of the wireless mesh devices their customers have installed and the devices connected to the meshes.
In this example app you can interact with the devices, assign them to different rooms in the house, and turn them on or off. To make this example even more interactive, you can add an actual nightlight and switch the lights on or off.
To build and deploy this example application, you'll need to have:
- An Akka Serverless account
- Java 11 or higher installed
- Maven 3.x or higher installed
- The Docker CLI installed
- A service account that can connect to Google Cloud Pubsub
If you have an LIFX bulb and would like it to stand in for a wirelessmesh device and have it light on/off when you toggle the device nightlight, you simply have to:
- Have an operational bulb
- When you create your customer location, be sure to set the access token to the authorizaton token you requested with LIFX.
- When you activate the device in this app, make sure it has the same device id as your bulb.
- More information [here][https://api.developer.lifx.com]
To connect to Google Cloud Pubsub, the easiest method is authenticate using a service account. To create your service account. After creating your service account, you need to download the service account key as a JSON file called mycreds.json.
To publish events to google pubsub locally, set the environment variable GOOGLE_PROJECT_ID to match your project id. You will need to create a the topic '"'wirelessmesh'
examples to set local variables for testing (mac os):
- export GOOGLE_APPLICATION_CREDENTIALS='/Users/memyselfandI/Downloads/mycreds.json'
- export GOOGLE_PROJECT_ID='diesel-broccoli-266021'
Be sure to set GOOGLE_PROJECT_ID during your akkaserverless deploy as well.
Next, you'll need to build a base image that contains the mycreds.json file and sets the environment variable GOOGLE_APPLICATION_CREDENTIALS to the service account key. You can build the docker image with by running:
docker build -f prereq.Dockerfile . -t mybaseimagethe new container will be named mybaseimage and will be used in subsequent steps. Note that pushing containers with service account keys to a public docker registry is a potentially dangerous situation.
To build your own container, follow the below steps
- If you haven't completed the previous step, because you don't need to connect to Google Cloud Pubsub, change
mybaseimageon line 58 toadoptopenjdk/openjdk8 - Update line 56 of the
pom.xmlfile with your Docker Hub username. - Run
mvn clean install
The command mvn clean install will create a new Docker image based on adoptopenjdk/openjdk8.
The result of the command should be
$ mvn clean install
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:31 min
[INFO] Finished at: 2021-01-20T16:20:29-08:00
[INFO] ------------------------------------------------------------------------To deploy the container as a service in Akka Serverless, you'll need to:
- Push the container to a container registry:
docker push -t <registry url>/<registry username>/akkaserverless-wirelessmesh-java:latest - Deploy the service in Akka Serverless:
akkasls svc deploy wirelessmesh <registry url>/<registry username>/akkaserverless-wirelessmesh-java:latest
The above command will deploy your container to your default project with the name wirelessmesh. If you want to have a different name, you can change that.
To test using Postman.
- First install Postman, found here
- Assuming you have deployed to akkaserverless and exposed your service to 'winter-mountain-2372.us-east1.apps.akkaserverless.com'...
- Create a Postman POST request to 'https://winter-mountain-2372.us-east1.apps.akkaserverless.com/wirelessmesh/add-customer-location' with the json body '{"customerLocationId": "my-first-location", "accessToken": "my lifx access token if applicable"}'
- You should see a response of '200(OK) {}', this will be the response of any POST
- You can now create a GET request to 'https://winter-mountain-2372.us-east1.apps.akkaserverless.com/wirelessmesh/get-customer-location?customerLocationId=my-first-location'
- You should see a json response containing your customer location and no devices.
- Create a POST request to 'https://winter-mountain-2372.us-east1.apps.akkaserverless.com/wirelessmesh/activate-device' with the body '{"customerLocationId": "my-first-location", "deviceId": "my-first-device"}'
- Create a POST requset to 'https://winter-mountain-2372.us-east1.apps.akkaserverless.com/wirelessmesh/assign-room' with the body '{"customerLocationId": "my-first-location", "deviceId": "my-first-device", "room": "office"}'
- Create a POST requset to 'https://winter-mountain-2372.us-east1.apps.akkaserverless.com/wirelessmesh/toggle-nightlight' with the body '{"customerLocationId": "my-first-location", "deviceId": "my-first-device"}'
- Rerun your get-customer-location request
- You should see a json response with your customer location and a collection of your single device with the room assigned and the nightlight on
- Create a POST request to 'https://winter-mountain-2372.us-east1.apps.akkaserverless.com/wirelessmesh/remove-device' with the body '{"customerLocationId": "my-first-location", "deviceId": "my-first-device"}'
- You should see a json response no longer containing any devices
- Create a POST request to 'https://winter-mountain-2372.us-east1.apps.akkaserverless.com/wirelessmesh/remove-customer-location' with the body '{"customerLocationId": "my-first-location"}'
- Rerun your get-customer-location request and you will see a server error since it no longer exists.
We welcome all contributions! Pull requests are the preferred way to share your contributions. For major changes, please open an issue first to discuss what you would like to change.
This project is provided on an as-is basis and is not covered by the Lightbend Support policy.
See the LICENSE.