datahub/datahub-frontend/app/controllers/TrackingController.java

package controllers;

import static auth.AuthUtils.ACTOR;

import auth.Authenticator;
import client.AuthServiceClient;
import client.KafkaTrackingProducer;
import com.fasterxml.jackson.databind.JsonNode;
import com.typesafe.config.Config;
import javax.annotation.Nonnull;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import play.mvc.Controller;
import play.mvc.Http;
import play.mvc.Result;
import play.mvc.Security;

// TODO: Migrate this to metadata-service.
@Singleton
public class TrackingController extends Controller {

  private static final Logger logger = LoggerFactory.getLogger(TrackingController.class.getName());

  private final String topic;

  @Inject KafkaTrackingProducer producer;

  @Inject AuthServiceClient authClient;

  @Inject
  public TrackingController(@Nonnull Config config) {
    topic = config.getString("analytics.tracking.topic");
  }

  @Security.Authenticated(Authenticator.class)
  @Nonnull
  public Result track(Http.Request request) throws Exception {
    if (!producer.isEnabled()) {
      // If tracking is disabled, simply return a 200.
      return status(200);
    }

    JsonNode event;
    try {
      event = request.body().asJson();
    } catch (Exception e) {
      return badRequest();
    }
    final String actor = request.session().data().get(ACTOR);
    try {
      logger.debug(
          String.format("Emitting product analytics event. actor: %s, event: %s", actor, event));
      final ProducerRecord<String, String> record =
          new ProducerRecord<>(topic, actor, event.toString());
      producer.send(record);
      authClient.track(event.toString());
      return ok();
    } catch (Exception e) {
      logger.error(
          String.format(
              "Failed to emit product analytics event. actor: %s, event: %s", actor, event));
      return internalServerError(e.getMessage());
    }
  }
}