59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package mqtt
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import (
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"fmt"
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"strings"
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"text/template"
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"github.com/influxdata/telegraf"
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)
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type TopicNameGenerator struct {
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Hostname string
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TopicPrefix string
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PluginName string
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metric telegraf.Metric
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template *template.Template
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}
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func NewTopicNameGenerator(topicPrefix string, topic string) (*TopicNameGenerator, error) {
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tt, err := template.New("topic_name").Parse(topic)
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if err != nil {
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return nil, err
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}
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for _, p := range strings.Split(topic, "/") {
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if strings.ContainsAny(p, "#+") {
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return nil, fmt.Errorf("found forbidden character %s in the topic name %s", p, topic)
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}
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}
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return &TopicNameGenerator{TopicPrefix: topicPrefix, template: tt}, nil
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}
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func (t *TopicNameGenerator) Tag(key string) string {
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tagString, _ := t.metric.GetTag(key)
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return tagString
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}
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func (t *TopicNameGenerator) Generate(hostname string, m telegraf.Metric) (string, error) {
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t.Hostname = hostname
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t.metric = m
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t.PluginName = m.Name()
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var b strings.Builder
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err := t.template.Execute(&b, t)
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if err != nil {
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return "", err
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}
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var ts []string
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for _, p := range strings.Split(b.String(), "/") {
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if p != "" {
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ts = append(ts, p)
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}
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}
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topic := strings.Join(ts, "/")
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// This is to keep backward compatibility with previous behaviour where the plugin name was always present
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if topic == "" {
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return m.Name(), nil
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}
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return topic, nil
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}
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