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.kafka.common.requests;
  
  import org.apache.kafka.common.Node;
  import org.apache.kafka.common.TopicIdPartition;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.internals.Topic;
  import org.apache.kafka.common.message.MetadataResponseData;
  import org.apache.kafka.common.protocol.ApiKeys;
  import org.apache.kafka.common.protocol.Errors;
  import org.apache.kafka.common.protocol.ObjectSerializationCache;
  import org.apache.kafka.common.record.RecordBatch;
  
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  public class RequestTestUtils {
  
      public static boolean hasIdempotentRecords(ProduceRequest request) {
          return RequestUtils.flag(request, RecordBatch::hasProducerId);
      }
  
      public static ByteBuffer serializeRequestHeader(RequestHeader header) {
          ObjectSerializationCache serializationCache = new ObjectSerializationCache();
          ByteBuffer buffer = ByteBuffer.allocate(header.size(serializationCache));
          header.write(buffer, serializationCache);
          buffer.flip();
          return buffer;
      }
  
      public static ByteBuffer serializeResponseWithHeader(AbstractResponse response, short version, int correlationId) {
          return response.serializeWithHeader(new ResponseHeader(correlationId,
              response.apiKey().responseHeaderVersion(version)), version);
      }
  
      public static MetadataResponse metadataResponse(Collection<Node> brokers,
                                                      String clusterId, int controllerId,
                                                      List<MetadataResponse.TopicMetadata> topicMetadataList) {
          return metadataResponse(brokers, clusterId, controllerId, topicMetadataList, ApiKeys.METADATA.latestVersion());
      }
  
      public static MetadataResponse metadataResponse(Collection<Node> brokers,
                                                      String clusterId, int controllerId,
                                                      List<MetadataResponse.TopicMetadata> topicMetadataList,
                                                      short responseVersion) {
          return metadataResponse(MetadataResponse.DEFAULT_THROTTLE_TIME, brokers, clusterId, controllerId,
                  topicMetadataList, MetadataResponse.AUTHORIZED_OPERATIONS_OMITTED, responseVersion);
      }
  
      public static MetadataResponse metadataResponse(int throttleTimeMs, Collection<Node> brokers,
                                                      String clusterId, int controllerId,
                                                      List<MetadataResponse.TopicMetadata> topicMetadatas,
                                                      int clusterAuthorizedOperations,
                                                      short responseVersion) {
          List<MetadataResponseData.MetadataResponseTopic> topics = new ArrayList<>();
          topicMetadatas.forEach(topicMetadata -> {
              MetadataResponseData.MetadataResponseTopic metadataResponseTopic = new MetadataResponseData.MetadataResponseTopic();
              metadataResponseTopic
                      .setErrorCode(topicMetadata.error().code())
                      .setName(topicMetadata.topic())
                      .setTopicId(topicMetadata.topicId())
                      .setIsInternal(topicMetadata.isInternal())
                      .setTopicAuthorizedOperations(topicMetadata.authorizedOperations());
  
              for (MetadataResponse.PartitionMetadata partitionMetadata : topicMetadata.partitionMetadata()) {
                  metadataResponseTopic.partitions().add(new MetadataResponseData.MetadataResponsePartition()
                          .setErrorCode(partitionMetadata.error.code())
                          .setPartitionIndex(partitionMetadata.partition())
                          .setLeaderId(partitionMetadata.leaderId.orElse(MetadataResponse.NO_LEADER_ID))
                          .setLeaderEpoch(partitionMetadata.leaderEpoch.orElse(RecordBatch.NO_PARTITION_LEADER_EPOCH))
                          .setReplicaNodes(partitionMetadata.replicaIds)
                          .setIsrNodes(partitionMetadata.inSyncReplicaIds)
                          .setOfflineReplicas(partitionMetadata.offlineReplicaIds));
              }
              topics.add(metadataResponseTopic);
          });
          return MetadataResponse.prepareResponse(responseVersion, throttleTimeMs, brokers, clusterId, controllerId,
                  topics, clusterAuthorizedOperations); }
  
      public static MetadataResponse metadataUpdateWith(final int numNodes,
                                                        final Map<String, Integer> topicPartitionCounts) {
          return metadataUpdateWith("kafka-cluster", numNodes, topicPartitionCounts);
      }
  
      public static MetadataResponse metadataUpdateWith(final int numNodes,
                                                        final Map<String, Integer> topicPartitionCounts,
                                                        final Function<TopicPartition, Integer> epochSupplier) {
          return metadataUpdateWith("kafka-cluster", numNodes, Collections.emptyMap(),
                  topicPartitionCounts, epochSupplier, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(), Collections.emptyMap());
      }
  
      public static MetadataResponse metadataUpdateWith(final String clusterId,
                                                        final int numNodes,
                                                        final Map<String, Integer> topicPartitionCounts) {
          return metadataUpdateWith(clusterId, numNodes, Collections.emptyMap(),
                  topicPartitionCounts, tp -> null, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(), Collections.emptyMap());
      }
  
      public static MetadataResponse metadataUpdateWith(final String clusterId,
                                                        final int numNodes,
                                                        final Map<String, Errors> topicErrors,
                                                        final Map<String, Integer> topicPartitionCounts) {
          return metadataUpdateWith(clusterId, numNodes, topicErrors,
                  topicPartitionCounts, tp -> null, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(), Collections.emptyMap());
      }
  
      public static MetadataResponse metadataUpdateWith(final String clusterId,
                                                        final int numNodes,
                                                        final Map<String, Errors> topicErrors,
                                                        final Map<String, Integer> topicPartitionCounts,
                                                        final short responseVersion) {
          return metadataUpdateWith(clusterId, numNodes, topicErrors,
                  topicPartitionCounts, tp -> null, MetadataResponse.PartitionMetadata::new, responseVersion, Collections.emptyMap());
      }
  
      public static MetadataResponse metadataUpdateWith(final String clusterId,
                                                        final int numNodes,
                                                        final Map<String, Errors> topicErrors,
                                                        final Map<String, Integer> topicPartitionCounts,
                                                        final Function<TopicPartition, Integer> epochSupplier) {
          return metadataUpdateWith(clusterId, numNodes, topicErrors,
                  topicPartitionCounts, epochSupplier, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(), Collections.emptyMap());
      }
  
      public static MetadataResponse metadataUpdateWithIds(final int numNodes,
                                                           final Map<String, Integer> topicPartitionCounts,
                                                           final Map<String, Uuid> topicIds) {
          return metadataUpdateWith("kafka-cluster", numNodes, Collections.emptyMap(),
                  topicPartitionCounts, tp -> null, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(),
                  topicIds);
      }
  
      public static MetadataResponse metadataUpdateWithIds(final int numNodes,
                                                           final Set<TopicIdPartition> partitions,
                                                           final Function<TopicPartition, Integer> epochSupplier) {
          final Map<String, Integer> topicPartitionCounts = new HashMap<>();
          final Map<String, Uuid> topicIds = new HashMap<>();
  
          partitions.forEach(partition -> {
              topicPartitionCounts.compute(partition.topic(), (key, value) -> value == null ? 1 : value + 1);
              topicIds.putIfAbsent(partition.topic(), partition.topicId());
          });
  
          return metadataUpdateWithIds(numNodes, topicPartitionCounts, epochSupplier, topicIds);
      }
  
      public static MetadataResponse metadataUpdateWithIds(final int numNodes,
                                                           final Map<String, Integer> topicPartitionCounts,
                                                           final Function<TopicPartition, Integer> epochSupplier,
                                                           final Map<String, Uuid> topicIds) {
          return metadataUpdateWith("kafka-cluster", numNodes, Collections.emptyMap(),
                  topicPartitionCounts, epochSupplier, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(),
                  topicIds);
      }
  
      public static MetadataResponse metadataUpdateWithIds(final int numNodes,
                                                           final Map<String, Integer> topicPartitionCounts,
                                                           final Function<TopicPartition, Integer> epochSupplier,
                                                           final Map<String, Uuid> topicIds,
                                                           final Boolean leaderOnly) {
          return metadataUpdateWith("kafka-cluster", numNodes, Collections.emptyMap(),
                  topicPartitionCounts, epochSupplier, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(),
                  topicIds, leaderOnly);
      }
  
      public static MetadataResponse metadataUpdateWithIds(final String clusterId,
                                                           final int numNodes,
                                                           final Map<String, Errors> topicErrors,
                                                           final Map<String, Integer> topicPartitionCounts,
                                                           final Function<TopicPartition, Integer> epochSupplier,
                                                           final Map<String, Uuid> topicIds) {
          return metadataUpdateWith(clusterId, numNodes, topicErrors,
                  topicPartitionCounts, epochSupplier, MetadataResponse.PartitionMetadata::new, ApiKeys.METADATA.latestVersion(), topicIds);
      }
  
      public static MetadataResponse metadataUpdateWith(final String clusterId,
                                                        final int numNodes,
                                                        final Map<String, Errors> topicErrors,
                                                        final Map<String, Integer> topicPartitionCounts,
                                                        final Function<TopicPartition, Integer> epochSupplier,
                                                        final PartitionMetadataSupplier partitionSupplier,
                                                        final short responseVersion,
                                                        final Map<String, Uuid> topicIds) {
          return metadataUpdateWith(clusterId, numNodes, topicErrors,
                  topicPartitionCounts, epochSupplier, partitionSupplier,
                  responseVersion, topicIds, true);
      }
  
      public static MetadataResponse metadataUpdateWith(final String clusterId,
                                                        final int numNodes,
                                                        final Map<String, Errors> topicErrors,
                                                        final Map<String, Integer> topicPartitionCounts,
                                                        final Function<TopicPartition, Integer> epochSupplier,
                                                        final PartitionMetadataSupplier partitionSupplier,
                                                        final short responseVersion,
                                                        final Map<String, Uuid> topicIds,
                                                        final Boolean leaderOnly) {
          final List<Node> nodes = new ArrayList<>(numNodes);
          for (int i = 0; i < numNodes; i++)
              nodes.add(new Node(i, "localhost", 1969 + i));
  
          List<MetadataResponse.TopicMetadata> topicMetadata = new ArrayList<>();
          for (Map.Entry<String, Integer> topicPartitionCountEntry : topicPartitionCounts.entrySet()) {
              String topic = topicPartitionCountEntry.getKey();
              int numPartitions = topicPartitionCountEntry.getValue();
  
              List<MetadataResponse.PartitionMetadata> partitionMetadata = new ArrayList<>(numPartitions);
              for (int i = 0; i < numPartitions; i++) {
                  TopicPartition tp = new TopicPartition(topic, i);
                  Node leader = nodes.get(i % nodes.size());
                  List<Integer> replicaIds = leaderOnly ? Collections.singletonList(leader.id()) : nodes.stream().map(Node::id).collect(Collectors.toList());
                  partitionMetadata.add(partitionSupplier.supply(
                          Errors.NONE, tp, Optional.of(leader.id()), Optional.ofNullable(epochSupplier.apply(tp)),
                          replicaIds, replicaIds, Collections.emptyList()));
              }
  
              topicMetadata.add(new MetadataResponse.TopicMetadata(Errors.NONE, topic, topicIds.getOrDefault(topic, Uuid.ZERO_UUID),
                      Topic.isInternal(topic), partitionMetadata, MetadataResponse.AUTHORIZED_OPERATIONS_OMITTED));
          }
  
          for (Map.Entry<String, Errors> topicErrorEntry : topicErrors.entrySet()) {
              String topic = topicErrorEntry.getKey();
              topicMetadata.add(new MetadataResponse.TopicMetadata(topicErrorEntry.getValue(), topic,
                      Topic.isInternal(topic), Collections.emptyList()));
          }
  
          return metadataResponse(nodes, clusterId, 0, topicMetadata, responseVersion);
      }
  
      @FunctionalInterface
      public interface PartitionMetadataSupplier {
          MetadataResponse.PartitionMetadata supply(Errors error,
                                                    TopicPartition partition,
                                                    Optional<Integer> leaderId,
                                                    Optional<Integer> leaderEpoch,
                                                    List<Integer> replicas,
                                                    List<Integer> isr,
                                                    List<Integer> offlineReplicas);
      }
  }
  