func()

in admin.go [340:420]
58 lines of code
13 McCabe index (conditional complexity)

func (ca *clusterAdmin) ListTopics() (map[string]TopicDetail, error) {
	// In order to build TopicDetails we need to first get the list of all
	// topics using a MetadataRequest and then get their configs using a
	// DescribeConfigsRequest request. To avoid sending many requests to the
	// broker, we use a single DescribeConfigsRequest.

	// Send the all-topic MetadataRequest
	b, err := ca.findAnyBroker()
	if err != nil {
		return nil, err
	}
	_ = b.Open(ca.client.Config())

	metadataReq := NewMetadataRequest(ca.conf.Version, nil)
	metadataResp, err := b.GetMetadata(metadataReq)
	if err != nil {
		return nil, err
	}

	topicsDetailsMap := make(map[string]TopicDetail)

	var describeConfigsResources []*ConfigResource

	for _, topic := range metadataResp.Topics {
		topicDetails := TopicDetail{
			NumPartitions: int32(len(topic.Partitions)),
		}
		if len(topic.Partitions) > 0 {
			topicDetails.ReplicaAssignment = map[int32][]int32{}
			for _, partition := range topic.Partitions {
				topicDetails.ReplicaAssignment[partition.ID] = partition.Replicas
			}
			topicDetails.ReplicationFactor = int16(len(topic.Partitions[0].Replicas))
		}
		topicsDetailsMap[topic.Name] = topicDetails

		// we populate the resources we want to describe from the MetadataResponse
		topicResource := ConfigResource{
			Type: TopicResource,
			Name: topic.Name,
		}
		describeConfigsResources = append(describeConfigsResources, &topicResource)
	}

	// Send the DescribeConfigsRequest
	describeConfigsReq := &DescribeConfigsRequest{
		Resources: describeConfigsResources,
	}

	if ca.conf.Version.IsAtLeast(V1_1_0_0) {
		describeConfigsReq.Version = 1
	}

	if ca.conf.Version.IsAtLeast(V2_0_0_0) {
		describeConfigsReq.Version = 2
	}

	describeConfigsResp, err := b.DescribeConfigs(describeConfigsReq)
	if err != nil {
		return nil, err
	}

	for _, resource := range describeConfigsResp.Resources {
		topicDetails := topicsDetailsMap[resource.Name]
		topicDetails.ConfigEntries = make(map[string]*string)

		for _, entry := range resource.Configs {
			entry := entry
			// only include non-default non-sensitive config
			// (don't actually think topic config will ever be sensitive)
			if entry.Default || entry.Sensitive {
				continue
			}
			topicDetails.ConfigEntries[entry.Name] = &entry.Value
		}

		topicsDetailsMap[resource.Name] = topicDetails
	}

	return topicsDetailsMap, nil
}