Consumers: Unsubscribe topics from consumer group

api/src/main/java/io/kafbat/ui/controller/ConsumerGroupsController.java

@@ -59,6 +59,22 @@ public Mono<ResponseEntity<Void>> deleteConsumerGroup(String clusterName,
         .thenReturn(ResponseEntity.ok().build());
   }
 
+  @Override
+  public Mono<ResponseEntity<Void>> deleteConsumerGroupOffsets(String clusterName, String groupId, String topicName,
+                                                               ServerWebExchange exchange) {
+    var context = AccessContext.builder()
+        .cluster(clusterName)
+        .consumerGroupActions(groupId, RESET_OFFSETS)
+        .topicActions(topicName, TopicAction.VIEW)
+        .operationName("deleteConsumerGroupOffsets")
+        .build();
+
+    return validateAccess(context)
+        .then(consumerGroupService.deleteConsumerGroupOffset(getCluster(clusterName), groupId, topicName))
+        .doOnEach(sig -> audit(context, sig))
+        .thenReturn(ResponseEntity.ok().build());
+  }
+
   @Override
   public Mono<ResponseEntity<ConsumerGroupDetailsDTO>> getConsumerGroup(String clusterName,
                                                                         String consumerGroupId,

api/src/main/java/io/kafbat/ui/service/ConsumerGroupService.java

@@ -247,6 +247,13 @@ public Mono<Void> deleteConsumerGroupById(KafkaCluster cluster,
         .flatMap(adminClient -> adminClient.deleteConsumerGroups(List.of(groupId)));
   }
 
+  public Mono<Void> deleteConsumerGroupOffset(KafkaCluster cluster,
+                                            String groupId,
+                                              String topicName) {
+    return adminClientService.get(cluster)
+        .flatMap(adminClient -> adminClient.deleteConsumerGroupOffsets(groupId, topicName));
+  }
+
   public EnhancedConsumer createConsumer(KafkaCluster cluster) {
     return createConsumer(cluster, Map.of());
   }

api/src/main/java/io/kafbat/ui/service/ReactiveAdminClient.java

@@ -74,6 +74,7 @@
 import org.apache.kafka.common.errors.ClusterAuthorizationException;
 import org.apache.kafka.common.errors.GroupIdNotFoundException;
 import org.apache.kafka.common.errors.GroupNotEmptyException;
+import org.apache.kafka.common.errors.GroupSubscribedToTopicException;
 import org.apache.kafka.common.errors.InvalidRequestException;
 import org.apache.kafka.common.errors.SecurityDisabledException;
 import org.apache.kafka.common.errors.TopicAuthorizationException;
@@ -436,6 +437,27 @@ public Mono<Void> deleteConsumerGroups(Collection<String> groupIds) {
             th -> Mono.error(new IllegalEntityStateException("The group is not empty")));
   }
 
+  public Mono<Void> deleteConsumerGroupOffsets(String groupId, String topicName) {
+    return listConsumerGroupOffsets(List.of(groupId), null)
+        .flatMap(table -> {
+          // filter TopicPartitions by topicName
+          Set<TopicPartition> partitions = table.row(groupId).keySet().stream()
+              .filter(tp -> tp.topic().equals(topicName))
+              .collect(Collectors.toSet());
+          // check if partitions have no committed offsets
+          return partitions.isEmpty()
+              ? Mono.error(new NotFoundException("The topic or partition is unknown"))
+              // call deleteConsumerGroupOffsets
+              : toMono(client.deleteConsumerGroupOffsets(groupId, partitions).all());
+        })
+        .onErrorResume(GroupIdNotFoundException.class,
+            th -> Mono.error(new NotFoundException("The group id does not exist")))
+        .onErrorResume(UnknownTopicOrPartitionException.class,
+            th -> Mono.error(new NotFoundException("The topic or partition is unknown")))
+        .onErrorResume(GroupSubscribedToTopicException.class,
+            th -> Mono.error(new IllegalEntityStateException("The group is not empty")));
+  }
+
   public Mono<Void> createTopic(String name,
                                 int numPartitions,
                                 @Nullable Integer replicationFactor,

api/src/test/java/io/kafbat/ui/KafkaConsumerGroupTests.java

@@ -4,6 +4,7 @@
 
 import io.kafbat.ui.model.ConsumerGroupDTO;
 import io.kafbat.ui.model.ConsumerGroupsPageResponseDTO;
+import io.kafbat.ui.producer.KafkaTestProducer;
 import java.io.Closeable;
 import java.time.Duration;
 import java.util.Comparator;
@@ -22,6 +23,8 @@
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.test.web.reactive.server.WebTestClient;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
 
 @Slf4j
 public class KafkaConsumerGroupTests extends AbstractIntegrationTest {
@@ -31,12 +34,76 @@ public class KafkaConsumerGroupTests extends AbstractIntegrationTest {
   @Test
   void shouldNotFoundWhenNoSuchConsumerGroupId() {
     String groupId = "groupA";
+    String topicName = "topicX";
+
     webTestClient
         .delete()
         .uri("/api/clusters/{clusterName}/consumer-groups/{groupId}", LOCAL, groupId)
         .exchange()
         .expectStatus()
         .isNotFound();
+
+    webTestClient
+        .delete()
+        .uri("/api/clusters/{clusterName}/consumer-groups/{groupId}/topics/{topicName}", LOCAL, groupId, topicName)
+        .exchange()
+        .expectStatus()
+        .isNotFound();
+  }
+
+  @Test
+  void shouldNotFoundWhenNoSuchTopic() {
+    String topicName = createTopicWithRandomName();
+    String topicNameUnSubscribed = "topicX";
+
+    //Create a consumer and subscribe to the topic
+    String groupId = UUID.randomUUID().toString();
+    try (val consumer = createTestConsumerWithGroupId(groupId)) {
+      consumer.subscribe(List.of(topicName));
+      consumer.poll(Duration.ofMillis(100));
+
+      webTestClient
+          .delete()
+          .uri("/api/clusters/{clusterName}/consumer-groups/{groupId}/topics/{topicName}", LOCAL, groupId,
+              topicNameUnSubscribed)
+          .exchange()
+          .expectStatus()
+          .isNotFound();
+    }
+  }
+
+  @Test
+  void shouldOkWhenConsumerGroupIsNotActiveAndPartitionOffsetExists() {
+    String topicName = createTopicWithRandomName();
+
+    //Create a consumer and subscribe to the topic
+    String groupId = UUID.randomUUID().toString();
+
+    try (KafkaTestProducer<String, String> producer = KafkaTestProducer.forKafka(kafka)) {
+      Flux.fromStream(
+          Stream.of("one", "two", "three", "four")
+              .map(value -> Mono.fromFuture(producer.send(topicName, value)))
+      ).blockLast();
+    } catch (Throwable e) {
+      log.error("Error on sending", e);
+      throw new RuntimeException(e);
+    }
+
+    try (val consumer = createTestConsumerWithGroupId(groupId)) {
+      consumer.subscribe(List.of(topicName));
+      consumer.poll(Duration.ofMillis(100));
+
+      //Stop consumers to delete consumer offset from the topic
+      consumer.pause(consumer.assignment());
+    }
+
+    //Delete the consumer offset when it's INACTIVE and check
+    webTestClient
+        .delete()
+        .uri("/api/clusters/{clusterName}/consumer-groups/{groupId}/topics/{topicName}", LOCAL, groupId, topicName)
+        .exchange()
+        .expectStatus()
+        .isOk();
   }
 
   @Test

contract/src/main/resources/swagger/kafbat-ui-api.yaml

@@ -1048,6 +1048,32 @@ paths:
         200:
           description: OK
 
+  /api/clusters/{clusterName}/consumer-groups/{id}/topics/{topicName}:
+    delete:
+      tags:
+        - Consumer Groups
+      summary: delete consumer group offsets
+      operationId: deleteConsumerGroupOffsets
+      parameters:
+        - name: clusterName
+          in: path
+          required: true
+          schema:
+            type: string
+        - name: id
+          in: path
+          required: true
+          schema:
+            type: string
+        - name: topicName
+          in: path
+          required: true
+          schema:
+            type: string
+      responses:
+        200:
+          description: OK
+
   /api/clusters/{clusterName}/schemas:
     post:
       tags:

frontend/src/components/ConsumerGroups/Details/ListItem.tsx

@@ -1,8 +1,16 @@
 import React from 'react';
-import { ConsumerGroupTopicPartition } from 'generated-sources';
+import {
+  Action,
+  ConsumerGroupTopicPartition,
+  ResourceType,
+} from 'generated-sources';
 import { Link } from 'react-router-dom';
 import { ClusterName } from 'lib/interfaces/cluster';
-import { clusterTopicPath } from 'lib/paths';
+import { ClusterGroupParam, clusterTopicPath } from 'lib/paths';
+import { useDeleteConsumerGroupOffsetsMutation } from 'lib/hooks/api/consumers';
+import useAppParams from 'lib/hooks/useAppParams';
+import { Dropdown } from 'components/common/Dropdown';
+import { ActionDropdownItem } from 'components/common/ActionComponent';
 import MessageToggleIcon from 'components/common/Icons/MessageToggleIcon';
 import IconButtonWrapper from 'components/common/Icons/IconButtonWrapper';
 import { TableKeyLink } from 'components/common/table/Table/TableKeyLink.styled';
@@ -18,6 +26,9 @@ interface Props {
 
 const ListItem: React.FC<Props> = ({ clusterName, name, consumers }) => {
   const [isOpen, setIsOpen] = React.useState(false);
+  const consumerProps = useAppParams<ClusterGroupParam>();
+  const deleteOffsetMutation =
+    useDeleteConsumerGroupOffsetsMutation(consumerProps);
 
   const getTotalconsumerLag = () => {
     let count = 0;
@@ -27,6 +38,11 @@ const ListItem: React.FC<Props> = ({ clusterName, name, consumers }) => {
     return count;
   };
 
+  const deleteOffsetHandler = (topicName?: string) => {
+    if (topicName === undefined) return;
+    deleteOffsetMutation.mutateAsync(topicName);
+  };
+
   return (
     <>
       <tr>
@@ -41,6 +57,22 @@ const ListItem: React.FC<Props> = ({ clusterName, name, consumers }) => {
           </FlexWrapper>
         </td>
         <td>{getTotalconsumerLag()}</td>
+        <td>
+          <Dropdown>
+            <ActionDropdownItem
+              onClick={() => deleteOffsetHandler(name)}
+              danger
+              confirm="Are you sure you want to delete offsets from the topic?"
+              permission={{
+                resource: ResourceType.CONSUMER,
+                action: Action.RESET_OFFSETS,
+                value: consumerProps.consumerGroupID,
+              }}
+            >
+              <span>Delete offsets</span>
+            </ActionDropdownItem>
+          </Dropdown>
+        </td>
       </tr>
       {isOpen && <TopicContents consumers={consumers} />}
     </>

frontend/src/lib/hooks/api/consumers.ts

@@ -90,3 +90,30 @@ export const useResetConsumerGroupOffsetsMutation = ({
     }
   );
 };
+
+export const useDeleteConsumerGroupOffsetsMutation = ({
+  clusterName,
+  consumerGroupID,
+}: UseConsumerGroupDetailsProps) => {
+  const queryClient = useQueryClient();
+  return useMutation(
+    (topicName: string) =>
+      api.deleteConsumerGroupOffsets({
+        clusterName,
+        id: consumerGroupID,
+        topicName,
+      }),
+    {
+      onSuccess: (_, topicName) => {
+        showSuccessAlert({
+          message: `Consumer ${consumerGroupID} group offsets in topic ${topicName} deleted`,
+        });
+        queryClient.invalidateQueries([
+          'clusters',
+          clusterName,
+          'consumerGroups',
+        ]);
+      },
+    }
+  );
+};