content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.cassandra.sidecar.handlers;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.AbstractModule;
  import com.google.inject.Guice;
  import com.google.inject.Injector;
  import com.google.inject.Module;
  import com.google.inject.Provides;
  import com.google.inject.Singleton;
  import com.google.inject.util.Modules;
  import io.vertx.core.Vertx;
  import io.vertx.ext.web.client.WebClient;
  import io.vertx.ext.web.client.predicate.ResponsePredicate;
  import io.vertx.junit5.VertxExtension;
  import io.vertx.junit5.VertxTestContext;
  import org.apache.cassandra.sidecar.TestModule;
  import org.apache.cassandra.sidecar.cluster.CassandraAdapterDelegate;
  import org.apache.cassandra.sidecar.cluster.InstancesMetadata;
  import org.apache.cassandra.sidecar.cluster.instance.InstanceMetadata;
  import org.apache.cassandra.sidecar.common.response.ConnectedClientStatsResponse;
  import org.apache.cassandra.sidecar.common.response.data.ClientConnectionEntry;
  import org.apache.cassandra.sidecar.common.server.MetricsOperations;
  import org.apache.cassandra.sidecar.modules.SidecarModules;
  import org.apache.cassandra.sidecar.server.Server;
  
  import static io.netty.handler.codec.http.HttpResponseStatus.OK;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  /**
   * Tests for the {@link ConnectedClientStatsHandler} class
   */
  @ExtendWith(VertxExtension.class)
  public class ConnectedClientStatsHandlerTest
  {
  
      private static final int EXPECTED_TOTAL_CLIENTS = 10;
      private static final Map<String, Long> EXPECTED_CONNECTIONS_BY_USER = new HashMap<String, Long>()
      {
          {
          put("u1", 5L);
          put("u2", 5L);
          }
      };
      private static final List<ClientConnectionEntry> EXPECTED_STATS = Arrays.asList(
      new ClientConnectionEntry("1", 0, false, null, null, "5", "u1", 5,
                                "name", "version", "keyspace1", Collections.emptyMap(), null, Collections.emptyMap()),
      new ClientConnectionEntry("1", 0, false, null, null, "5", "u1", 5,
                                "name", "version", "keyspace1", Collections.emptyMap(), null, Collections.emptyMap()));
      static final Logger LOGGER = LoggerFactory.getLogger(ConnectedClientStatsHandlerTest.class);
      Vertx vertx;
      Server server;
  
      @BeforeEach
      void before() throws InterruptedException
      {
          Module testOverride = Modules.override(new TestModule())
                                       .with(new ConnectedClientStatsTestModule());
          Injector injector = Guice.createInjector(Modules.override(SidecarModules.all())
                                                          .with(testOverride));
  
          server = injector.getInstance(Server.class);
          vertx = injector.getInstance(Vertx.class);
          VertxTestContext context = new VertxTestContext();
          server.start()
                .onSuccess(s -> context.completeNow())
                .onFailure(context::failNow);
          context.awaitCompletion(5, TimeUnit.SECONDS);
      }
  
      @AfterEach
      void after() throws InterruptedException
      {
          CountDownLatch closeLatch = new CountDownLatch(1);
          server.close().onSuccess(res -> closeLatch.countDown());
          if (closeLatch.await(60, TimeUnit.SECONDS))
              LOGGER.info("Close event received before timeout.");
          else
              LOGGER.error("Close event timed out.");
      }
  
      @Test
      void testHandlerStats(VertxTestContext context)
      {
          WebClient client = WebClient.create(vertx);
          String testRoute = "/api/v1/cassandra/stats/connected-clients";
          client.get(server.actualPort(), "127.0.0.1", testRoute)
                .expect(ResponsePredicate.SC_OK)
                .send(context.succeeding(response -> {
                    assertThat(response.statusCode()).isEqualTo(OK.code());
                    ConnectedClientStatsResponse statsResponse = response.bodyAsJson(ConnectedClientStatsResponse.class);
                    assertThat(statsResponse).isNotNull();
                    assertThat(statsResponse.totalConnectedClients()).isEqualTo(EXPECTED_TOTAL_CLIENTS);
                    assertThat(statsResponse.connectionsByUser()).hasSize(EXPECTED_CONNECTIONS_BY_USER.size());
                    context.completeNow();
                }));
      }
  
      static class ConnectedClientStatsTestModule extends AbstractModule
      {
          @Provides
          @Singleton
          public InstancesMetadata instanceConfig()
          {
              ConnectedClientStatsResponse summaryResponse = new ConnectedClientStatsResponse(Collections.emptyList(),
                                                                                              EXPECTED_TOTAL_CLIENTS,
                                                                                              EXPECTED_CONNECTIONS_BY_USER);
              ConnectedClientStatsResponse statsResponse = new ConnectedClientStatsResponse(EXPECTED_STATS,
                                                                                            EXPECTED_TOTAL_CLIENTS,
                                                                                            EXPECTED_CONNECTIONS_BY_USER);
  
              final int instanceId = 100;
              final String host = "127.0.0.1";
              final InstanceMetadata instanceMetadata = mock(InstanceMetadata.class);
              when(instanceMetadata.host()).thenReturn(host);
              when(instanceMetadata.port()).thenReturn(9042);
              when(instanceMetadata.id()).thenReturn(instanceId);
              when(instanceMetadata.stagingDir()).thenReturn("");
  
              CassandraAdapterDelegate delegate = mock(CassandraAdapterDelegate.class);
              MetricsOperations mockMetricsOperations = mock(MetricsOperations.class);
              when(mockMetricsOperations.connectedClientStats(true)).thenReturn(summaryResponse);
              when(mockMetricsOperations.connectedClientStats(false)).thenReturn(statsResponse);
              when(delegate.metricsOperations()).thenReturn(mockMetricsOperations);
              when(instanceMetadata.delegate()).thenReturn(delegate);
  
              InstancesMetadata mockInstancesMetadata = mock(InstancesMetadata.class);
              when(mockInstancesMetadata.instances()).thenReturn(Collections.singletonList(instanceMetadata));
              when(mockInstancesMetadata.instanceFromId(instanceId)).thenReturn(instanceMetadata);
              when(mockInstancesMetadata.instanceFromHost(host)).thenReturn(instanceMetadata);
  
              return mockInstancesMetadata;
          }
      }
  }
  