kafka-ui/kafka-ui-api/src/main/java/com/provectus/kafka/ui/controller/TopicsController.java

package com.provectus.kafka.ui.controller;

import com.provectus.kafka.ui.api.TopicsApi;
import com.provectus.kafka.ui.model.PartitionsIncrease;
import com.provectus.kafka.ui.model.PartitionsIncreaseResponse;
import com.provectus.kafka.ui.model.Topic;
import com.provectus.kafka.ui.model.TopicColumnsToSort;
import com.provectus.kafka.ui.model.TopicConfig;
import com.provectus.kafka.ui.model.TopicCreation;
import com.provectus.kafka.ui.model.TopicDetails;
import com.provectus.kafka.ui.model.TopicUpdate;
import com.provectus.kafka.ui.model.TopicsResponse;
import com.provectus.kafka.ui.service.ClusterService;
import java.util.Optional;
import javax.validation.Valid;
import lombok.RequiredArgsConstructor;
import lombok.extern.log4j.Log4j2;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@RestController
@RequiredArgsConstructor
@Log4j2
public class TopicsController implements TopicsApi {
  private final ClusterService clusterService;

  @Override
  public Mono<ResponseEntity<Topic>> createTopic(
      String clusterName, @Valid Mono<TopicCreation> topicCreation, ServerWebExchange exchange) {
    return clusterService.createTopic(clusterName, topicCreation)
        .map(s -> new ResponseEntity<>(s, HttpStatus.OK))
        .switchIfEmpty(Mono.just(ResponseEntity.notFound().build()));
  }

  @Override
  public Mono<ResponseEntity<Void>> deleteTopic(
      String clusterName, String topicName, ServerWebExchange exchange) {
    return clusterService.deleteTopic(clusterName, topicName).map(ResponseEntity::ok);
  }


  @Override
  public Mono<ResponseEntity<Flux<TopicConfig>>> getTopicConfigs(
      String clusterName, String topicName, ServerWebExchange exchange) {
    return Mono.just(
        clusterService.getTopicConfigs(clusterName, topicName)
            .map(Flux::fromIterable)
            .map(ResponseEntity::ok)
            .orElse(ResponseEntity.notFound().build())
    );
  }

  @Override
  public Mono<ResponseEntity<TopicDetails>> getTopicDetails(
      String clusterName, String topicName, ServerWebExchange exchange) {
    return Mono.just(
        clusterService.getTopicDetails(clusterName, topicName)
            .map(ResponseEntity::ok)
            .orElse(ResponseEntity.notFound().build())
    );
  }

  @Override
  public Mono<ResponseEntity<TopicsResponse>> getTopics(String clusterName, @Valid Integer page,
                                                        @Valid Integer perPage,
                                                        @Valid Boolean showInternal,
                                                        @Valid String search,
                                                        @Valid TopicColumnsToSort orderBy,
                                                        ServerWebExchange exchange) {
    return Mono.just(ResponseEntity.ok(clusterService
        .getTopics(
            clusterName,
            Optional.ofNullable(page),
            Optional.ofNullable(perPage),
            Optional.ofNullable(showInternal),
            Optional.ofNullable(search),
            Optional.ofNullable(orderBy)
        )));
  }

  @Override
  public Mono<ResponseEntity<Topic>> updateTopic(
      String clusterId, String topicName, @Valid Mono<TopicUpdate> topicUpdate,
      ServerWebExchange exchange) {
    return clusterService.updateTopic(clusterId, topicName, topicUpdate).map(ResponseEntity::ok);
  }

  @Override
  public Mono<ResponseEntity<PartitionsIncreaseResponse>> increaseTopicPartitions(
      String clusterName, String topicName,
      Mono<PartitionsIncrease> partitionsIncrease,
      ServerWebExchange exchange) {
    return partitionsIncrease.flatMap(
        partitions -> clusterService.increaseTopicPartitions(clusterName, topicName, partitions))
        .map(ResponseEntity::ok);
  }
}