func list(client *pubsub.Client) ([]*pubsub.Topic, error) {
ctx := context.Background()
// [START list_topics]
var topics []*pubsub.Topic
it := client.Topics(ctx)
for {
topic, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return nil, err
}
topics = append(topics, topic)
}
return topics, nil
// [END list_topics]
}
