kLyfft

Table of content

• Into
• How to build
• How to run
  • Prerequisites
  • Web App
  • Docker
  • Deployment with Kotlin Kubernetes DSL

the kLyfft app - event-driven app

A uber-like event-driven application example

Note	inspired by James Ward’s Koober but much better because Kotlin and Spring Boot used (not Scala 🤮 and Play 🤢)

Warning

Flame 🔥 War warning! The demo is written with Groovy (mostly build scripts) and Kotlin. Because why not? 💃

Into

The application consists of Web UI (driver and rider). A rider initiates a, and the driver picks her.

How to build

./gradlew clean build

How to run

Prerequisites

• Confluent Platform Enterprise 5.x ^[1]

  • download it

  • unizip to any folder

  • add folder to PATH variable

    export CONFLUENT_PLATFORM_VERSION=5.1.0
    export CONFLUENT_HOME=~/projects/confluent/confluent-ent/$CONFLUENT_PLATFORM_VERSION
    export PATH=$CONFLUENT_HOME/bin:$PATH
    alias cnfl="confluent" #(1)
    
    cnfl start kafka #(2)

    1. a neat little alias that can save few symbols to type

    2. start Kafka (zookeeper will be started automatically as a dependency)

Web App

1. Obtain an API key from [mapbox.com](https://www.mapbox.com/)

2. Start the Play web app: MAPBOX_ACCESS_TOKEN=YOUR-MAPBOX-API-KEY ./gradlew bootRun

   • http://localhost:9090/driver - Driver’s UI

   • http://localhost:9090/rider - Rider’s UI

3. on the Rider UI select where do you want to travel

4. on the Driver UI select rider and enjoy the ride!

Docker

1. Build a docker image

   ./gradlew jib

2. Deploy to Kubernetes

   kubectl create -f deployment.yaml

Deployment with Kotlin Kubernetes DSL

Create Application Config

./gradlew :deployment:createApplicationConfig -PconfigPath=$PWD/app/src/main/resources/application.properties #(1)

kubectl get secret application-config -o yaml   #(2)

./gradlew :deployment:deploy        #(3)

kubectl get deployments

./gradlew :deployment:undeploy      #(4)

1. Deploy application secrets

2. check the secret

3. Deploy the app

4. Undeploy the app

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1. https://www.confluent.io/download/