duel

Simulates a duel and streams live updates. Live: https://asarkar-duel.herokuapp.com/

Technologies Used

1. Ktor: For server-side Websocket and session.
2. Kodein-DI: For KOtlin DEpendency INjection.
3. grpc-kotlin: For bidirectional gRPC streaming modelled as Kotlin Flow.
4. Vue.js: For client UI.

Running Locally

Run ./gradlew clean run and go to the URL shown on the console once the application has started.

To run from inside IntelliJ, create a new Run Configuration as shown below:

Deploying to Heroku

1. Commit all changes locally.
2. heroku login
3. git push heroku master
4. heroku logs --tail
5. heroku open

See this article about how to generate an API key. This key can then be set as HEROKU_API_KEY environment variable.

Distributed Tracing using OpenTelemetry and Jaeger

opentelemetry-java-instrumentation works OOTB.

Steps:

1. Download opentelemetry-javaagent-all.jar.
2. Start Jaegar Docker container locally:

   docker run --rm -it --name jaeger \
   -p 16686:16686 \
   -p 14250:14250 \
   jaegertracing/all-in-one
   

3. Start application:

   java -javaagent:/path/to/opentelemetry-javaagent-all.jar \
   -Dotel.exporter=jaeger \
   -Dotel.jaeger.service.name=duel \
   -Dotel.jaeger.endpoint=localhost:14250 \
   -jar build/libs/duel.jar
   

4. Go to http://0.0.0.0:8080/ and click on Start button.
5. Go to http://localhost:16686/ and search for traces.