132 lines
2.8 KiB
Go
132 lines
2.8 KiB
Go
package prometheus_client
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import (
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"fmt"
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"log"
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"net/http"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/outputs"
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"github.com/prometheus/client_golang/prometheus"
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)
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type PrometheusClient struct {
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Listen string
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metrics map[string]*prometheus.UntypedVec
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}
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var sampleConfig = `
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## Address to listen on
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# listen = ":9126"
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`
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func (p *PrometheusClient) Start() error {
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if p.Listen == "" {
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p.Listen = "localhost:9126"
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}
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http.Handle("/metrics", prometheus.Handler())
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server := &http.Server{
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Addr: p.Listen,
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}
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p.metrics = make(map[string]*prometheus.UntypedVec)
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go server.ListenAndServe()
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return nil
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}
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func (p *PrometheusClient) Stop() {
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// TODO: Use a listener for http.Server that counts active connections
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// that can be stopped and closed gracefully
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}
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func (p *PrometheusClient) Connect() error {
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// This service output does not need to make any further connections
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return nil
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}
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func (p *PrometheusClient) Close() error {
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// This service output does not need to close any of its connections
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return nil
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}
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func (p *PrometheusClient) SampleConfig() string {
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return sampleConfig
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}
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func (p *PrometheusClient) Description() string {
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return "Configuration for the Prometheus client to spawn"
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}
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func (p *PrometheusClient) Write(metrics []telegraf.Metric) error {
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if len(metrics) == 0 {
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return nil
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}
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for _, point := range metrics {
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var labels []string
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key := point.Name()
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for k, _ := range point.Tags() {
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if len(k) > 0 {
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labels = append(labels, k)
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}
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}
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l := prometheus.Labels{}
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for tk, tv := range point.Tags() {
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l[tk] = tv
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}
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for n, val := range point.Fields() {
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var mname string
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if n == "value" {
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mname = key
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} else {
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mname = fmt.Sprintf("%s_%s", key, n)
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}
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if _, ok := p.metrics[mname]; !ok {
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p.metrics[mname] = prometheus.NewUntypedVec(
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prometheus.UntypedOpts{
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Name: mname,
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Help: fmt.Sprintf("Telegraf collected point '%s'", mname),
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},
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labels,
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)
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prometheus.MustRegister(p.metrics[mname])
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}
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switch val := val.(type) {
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default:
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log.Printf("Prometheus output, unsupported type. key: %s, type: %T\n",
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mname, val)
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case int64:
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m, err := p.metrics[mname].GetMetricWith(l)
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if err != nil {
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log.Printf("ERROR Getting metric in Prometheus output, "+
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"key: %s, labels: %v,\nerr: %s\n",
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mname, l, err.Error())
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continue
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}
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m.Set(float64(val))
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case float64:
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m, err := p.metrics[mname].GetMetricWith(l)
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if err != nil {
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log.Printf("ERROR Getting metric in Prometheus output, "+
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"key: %s, labels: %v,\nerr: %s\n",
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mname, l, err.Error())
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continue
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}
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m.Set(val)
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}
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}
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}
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return nil
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}
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func init() {
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outputs.Add("prometheus_client", func() telegraf.Output {
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return &PrometheusClient{}
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})
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}
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