Add endpoint to retrieve subjects from schema registry by cluster name

kafka-ui-api/src/main/java/com/provectus/kafka/ui/cluster/service/ClusterService.java

@@ -31,6 +31,7 @@ public class ClusterService {
     private final ClusterMapper clusterMapper;
     private final KafkaService kafkaService;
     private final ConsumingService consumingService;
+    private final SchemaRegistryService schemaRegistryService;
 
     public List<Cluster> getClusters() {
         return clustersStorage.getKafkaClusters()
@@ -180,4 +181,7 @@ public class ClusterService {
                 .orElse(Flux.empty());
     }
 
+    public Flux<String> getSchemaSubjects(String clusterName) {
+        return schemaRegistryService.getAllSchemaSubjects(clusterName);
+    }
 }

kafka-ui-api/src/main/java/com/provectus/kafka/ui/cluster/service/SchemaRegistryService.java

@@ -0,0 +1,26 @@
+package com.provectus.kafka.ui.cluster.service;
+
+import com.provectus.kafka.ui.cluster.model.ClustersStorage;
+import com.provectus.kafka.ui.cluster.model.KafkaCluster;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.log4j.Log4j2;
+import org.springframework.stereotype.Service;
+import org.springframework.web.reactive.function.client.WebClient;
+import reactor.core.publisher.Flux;
+
+@Service
+@Log4j2
+@RequiredArgsConstructor
+public class SchemaRegistryService {
+    private final ClustersStorage clustersStorage;
+    public static final String URL_SUBJECTS = "/subjects";
+
+    public Flux<String> getAllSchemaSubjects(String clusterName) {
+        KafkaCluster kafkaCluster = clustersStorage.getClusterByName(clusterName).orElseThrow();
+        WebClient webClient = WebClient.create(kafkaCluster.getSchemaRegistry());
+        return webClient.get()
+                .uri(URL_SUBJECTS)
+                .retrieve()
+                .bodyToFlux(String.class);
+    }
+}

kafka-ui-api/src/main/java/com/provectus/kafka/ui/rest/MetricsRestController.java

@@ -100,6 +100,12 @@ public class MetricsRestController implements ApiClustersApi {
                 .switchIfEmpty(Mono.just(ResponseEntity.notFound().build())); // TODO: check behaviour on cluster not found and empty groups list
     }
 
+    @Override
+    public Mono<ResponseEntity<Flux<String>>> getSchemaSubjects(String clusterName, ServerWebExchange exchange) {
+        Flux<String> subjects = clusterService.getSchemaSubjects(clusterName);
+        return Mono.just(ResponseEntity.ok(subjects));
+    }
+
     @Override
     public Mono<ResponseEntity<ConsumerGroupDetails>> getConsumerGroup(String clusterName, String consumerGroupId, ServerWebExchange exchange) {
         return clusterService.getConsumerGroupDetail(clusterName, consumerGroupId).map(ResponseEntity::ok);

kafka-ui-api/src/main/resources/application-local.yml

@@ -2,9 +2,9 @@ kafka:
   clusters:
     -
       name: local
-      bootstrapServers: localhost:9092
+      bootstrapServers: localhost:9093
       zookeeper: localhost:2181
-      schemaRegistry: http://localhost:8085
+      schemaRegistry: http://localhost:8081
 #      schemaNameTemplate: "%s-value"
       jmxPort: 9997
     -

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

@@ -335,6 +335,28 @@ paths:
                 items:
                   $ref: '#/components/schemas/ConsumerGroup'
 
+  /api/clusters/{clusterName}/schema/subjects:
+    get:
+      tags:
+        - /api/clusters
+      summary: get all subjects from schema registry
+      operationId: getSchemaSubjects
+      parameters:
+        - name: clusterName
+          in: path
+          required: true
+          schema:
+            type: string
+      responses:
+        200:
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  type: string
+
 components:
   schemas:
     Cluster: