// ListTags returns all tags on one topic
func ListTags(topic tat.Topic) ([]string, error) {
var tags []string
err := store.GetCMessages(topic.Collection).
Find(bson.M{"topic": topic.Topic}).
Distinct("tags", &tags)
if err != nil {
log.Errorf("Error while getting tags on topic %s, err:%s", topic.Topic, err.Error())
}
return tags, err
}
// ListLabels returns all labels on one topic
func ListLabels(topic tat.Topic) ([]tat.Label, error) {
var labels []tat.Label
err := store.GetCMessages(topic.Collection).
Find(bson.M{"topic": topic.Topic}).
Distinct("labels", &labels)
if err != nil {
log.Errorf("Error while getting labels on topic %s, err:%s", topic.Topic, err.Error())
}
return labels, err
}
// Truncate removes all messages in a topic
func Truncate(topic *tat.Topic) (int, error) {
var changeInfo *mgo.ChangeInfo
var err error
if topic.Collection != "" && topic.Collection != store.CollectionDefaultMessages {
changeInfo, err = store.GetCMessages(topic.Collection).RemoveAll(bson.M{})
} else {
changeInfo, err = store.GetCMessages(topic.Collection).RemoveAll(bson.M{"topic": topic.Topic})
// TODO remove this after remove defaultMessagesCollection
changeInfoOld, errOld := store.GetCMessages(topic.Collection).RemoveAll(bson.M{"topics": bson.M{"$in": [1]string{topic.Topic}}})
if errOld != nil {
log.Warnf("Error while removing message with topics attribute: %s", errOld)
} else {
log.Infof("Remove %d message with old way, select on topics attribute", changeInfoOld.Removed)
}
}
if err != nil {
return 0, err
}
cache.CleanMessagesLists(topic.Topic)
return changeInfo.Removed, err
}