Ensure prometheus metrics have same set of labels (#2857)
This commit is contained in:
Daniel Nelson
GitHub
parent
246f342e6a
commit
949072e8dc
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@ -6,6 +6,8 @@ import (
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"log"
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"net/http"
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"regexp"
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"sort"
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"strings"
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"sync"
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"time"
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@ -17,19 +19,40 @@ import (
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var invalidNameCharRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
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type MetricWithExpiration struct {
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Metric prometheus.Metric
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// SampleID uniquely identifies a Sample
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type SampleID string
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// Sample represents the current value of a series.
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type Sample struct {
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// Labels are the Prometheus labels.
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Labels map[string]string
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// Value is the value in the Prometheus output.
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Value float64
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// Expiration is the deadline that this Sample is valid until.
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Expiration time.Time
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}
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// MetricFamily contains the data required to build valid prometheus Metrics.
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type MetricFamily struct {
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// Samples are the Sample belonging to this MetricFamily.
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Samples map[SampleID]*Sample
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// Type of the Value.
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ValueType prometheus.ValueType
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// LabelSet is the label counts for all Samples.
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LabelSet map[string]int
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}
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type PrometheusClient struct {
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Listen string
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ExpirationInterval internal.Duration `toml:"expiration_interval"`
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server *http.Server
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metrics map[string]*MetricWithExpiration
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sync.Mutex
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// fam is the non-expired MetricFamily by Prometheus metric name.
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fam map[string]*MetricFamily
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// now returns the current time.
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now func() time.Time
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}
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var sampleConfig = `
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@ -41,7 +64,6 @@ var sampleConfig = `
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`
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func (p *PrometheusClient) Start() error {
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p.metrics = make(map[string]*MetricWithExpiration)
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prometheus.Register(p)
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if p.Listen == "" {
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@ -88,96 +110,153 @@ func (p *PrometheusClient) Describe(ch chan<- *prometheus.Desc) {
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prometheus.NewGauge(prometheus.GaugeOpts{Name: "Dummy", Help: "Dummy"}).Describe(ch)
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}
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// Implements prometheus.Collector
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// Expire removes Samples that have expired.
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func (p *PrometheusClient) Expire() {
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now := p.now()
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for name, family := range p.fam {
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for key, sample := range family.Samples {
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if p.ExpirationInterval.Duration != 0 && now.After(sample.Expiration) {
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for k, _ := range sample.Labels {
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family.LabelSet[k]--
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}
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delete(family.Samples, key)
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if len(family.Samples) == 0 {
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delete(p.fam, name)
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}
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}
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}
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}
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}
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// Collect implements prometheus.Collector
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func (p *PrometheusClient) Collect(ch chan<- prometheus.Metric) {
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p.Lock()
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defer p.Unlock()
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for key, m := range p.metrics {
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if p.ExpirationInterval.Duration != 0 && time.Now().After(m.Expiration) {
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delete(p.metrics, key)
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} else {
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ch <- m.Metric
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p.Expire()
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for name, family := range p.fam {
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// Get list of all labels on MetricFamily
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var labelNames []string
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for k, v := range family.LabelSet {
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if v > 0 {
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labelNames = append(labelNames, k)
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}
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}
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desc := prometheus.NewDesc(name, "Telegraf collected metric", labelNames, nil)
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for _, sample := range family.Samples {
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// Get labels for this sample; unset labels will be set to the
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// empty string
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var labels []string
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for _, label := range labelNames {
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v := sample.Labels[label]
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labels = append(labels, v)
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}
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metric, err := prometheus.NewConstMetric(desc, family.ValueType, sample.Value, labels...)
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if err != nil {
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log.Printf("E! Error creating prometheus metric, "+
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"key: %s, labels: %v,\nerr: %s\n",
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name, labels, err.Error())
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}
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ch <- metric
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}
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}
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}
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func sanitize(value string) string {
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return invalidNameCharRE.ReplaceAllString(value, "_")
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}
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func valueType(tt telegraf.ValueType) prometheus.ValueType {
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switch tt {
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case telegraf.Counter:
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return prometheus.CounterValue
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case telegraf.Gauge:
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return prometheus.GaugeValue
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default:
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return prometheus.UntypedValue
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}
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}
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// CreateSampleID creates a SampleID based on the tags of a telegraf.Metric.
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func CreateSampleID(tags map[string]string) SampleID {
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pairs := make([]string, 0, len(tags))
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for k, v := range tags {
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pairs = append(pairs, fmt.Sprintf("%s=%s", k, v))
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}
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sort.Strings(pairs)
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return SampleID(strings.Join(pairs, ","))
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}
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func (p *PrometheusClient) Write(metrics []telegraf.Metric) error {
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p.Lock()
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defer p.Unlock()
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if len(metrics) == 0 {
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return nil
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}
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now := p.now()
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for _, point := range metrics {
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key := point.Name()
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key = invalidNameCharRE.ReplaceAllString(key, "_")
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tags := point.Tags()
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vt := valueType(point.Type())
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sampleID := CreateSampleID(tags)
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// convert tags into prometheus labels
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var labels []string
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l := prometheus.Labels{}
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for k, v := range point.Tags() {
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k = invalidNameCharRE.ReplaceAllString(k, "_")
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if len(k) == 0 {
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continue
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}
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labels = append(labels, k)
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l[k] = v
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labels := make(map[string]string)
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for k, v := range tags {
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labels[sanitize(k)] = sanitize(v)
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}
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// Get a type if it's available, defaulting to Untyped
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var mType prometheus.ValueType
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switch point.Type() {
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case telegraf.Counter:
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mType = prometheus.CounterValue
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case telegraf.Gauge:
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mType = prometheus.GaugeValue
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default:
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mType = prometheus.UntypedValue
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}
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for n, val := range point.Fields() {
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for fn, fv := range point.Fields() {
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// Ignore string and bool fields.
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switch val.(type) {
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case string:
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continue
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case bool:
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continue
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}
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// sanitize the measurement name
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n = invalidNameCharRE.ReplaceAllString(n, "_")
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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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desc := prometheus.NewDesc(mname, "Telegraf collected metric", nil, l)
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var metric prometheus.Metric
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var err error
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// switch for field type
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switch val := val.(type) {
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var value float64
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switch fv := fv.(type) {
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case int64:
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metric, err = prometheus.NewConstMetric(desc, mType, float64(val))
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value = float64(fv)
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case float64:
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metric, err = prometheus.NewConstMetric(desc, mType, val)
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value = fv
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default:
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continue
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}
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if err != nil {
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log.Printf("E! Error creating prometheus metric, "+
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"key: %s, labels: %v,\nerr: %s\n",
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mname, l, err.Error())
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sample := &Sample{
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Labels: labels,
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Value: value,
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Expiration: now.Add(p.ExpirationInterval.Duration),
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}
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p.metrics[desc.String()] = &MetricWithExpiration{
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Metric: metric,
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Expiration: time.Now().Add(p.ExpirationInterval.Duration),
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// Special handling of value field; supports passthrough from
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// the prometheus input.
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var mname string
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if fn == "value" {
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mname = sanitize(point.Name())
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} else {
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mname = sanitize(fmt.Sprintf("%s_%s", point.Name(), fn))
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}
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var fam *MetricFamily
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var ok bool
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if fam, ok = p.fam[mname]; !ok {
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fam = &MetricFamily{
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Samples: make(map[SampleID]*Sample),
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ValueType: vt,
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LabelSet: make(map[string]int),
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}
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p.fam[mname] = fam
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} else {
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if fam.ValueType != vt {
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// Don't return an error since this would be a permanent error
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log.Printf("Mixed ValueType for measurement %q; dropping point", point.Name())
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break
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}
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}
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for k, _ := range sample.Labels {
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fam.LabelSet[k]++
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}
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fam.Samples[sampleID] = sample
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}
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}
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return nil
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@ -187,6 +266,8 @@ func init() {
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outputs.Add("prometheus_client", func() telegraf.Output {
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return &PrometheusClient{
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ExpirationInterval: internal.Duration{Duration: time.Second * 60},
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fam: make(map[string]*MetricFamily),
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now: time.Now,
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}
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})
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}
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@ -4,16 +4,314 @@ import (
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/metric"
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"github.com/influxdata/telegraf/plugins/inputs/prometheus"
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prometheus_input "github.com/influxdata/telegraf/plugins/inputs/prometheus"
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"github.com/influxdata/telegraf/testutil"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/stretchr/testify/require"
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)
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func setUnixTime(client *PrometheusClient, sec int64) {
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client.now = func() time.Time {
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return time.Unix(sec, 0)
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}
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}
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// NewClient initializes a PrometheusClient.
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func NewClient() *PrometheusClient {
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return &PrometheusClient{
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ExpirationInterval: internal.Duration{Duration: time.Second * 60},
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fam: make(map[string]*MetricFamily),
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now: time.Now,
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}
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}
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func TestWrite_Basic(t *testing.T) {
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now := time.Now()
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pt1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": 0.0},
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now)
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var metrics = []telegraf.Metric{
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pt1,
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}
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client := NewClient()
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err = client.Write(metrics)
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require.NoError(t, err)
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fam, ok := client.fam["foo"]
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require.True(t, ok)
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require.Equal(t, prometheus.UntypedValue, fam.ValueType)
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require.Equal(t, map[string]int{}, fam.LabelSet)
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sample, ok := fam.Samples[CreateSampleID(pt1.Tags())]
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require.True(t, ok)
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require.Equal(t, 0.0, sample.Value)
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require.True(t, now.Before(sample.Expiration))
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}
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func TestWrite_IntField(t *testing.T) {
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client := NewClient()
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p1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": 42},
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time.Now())
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err = client.Write([]telegraf.Metric{p1})
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require.NoError(t, err)
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fam, ok := client.fam["foo"]
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require.True(t, ok)
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for _, v := range fam.Samples {
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require.Equal(t, 42.0, v.Value)
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}
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}
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func TestWrite_FieldNotValue(t *testing.T) {
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client := NewClient()
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p1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"howdy": 0.0},
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time.Now())
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err = client.Write([]telegraf.Metric{p1})
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require.NoError(t, err)
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fam, ok := client.fam["foo_howdy"]
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require.True(t, ok)
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for _, v := range fam.Samples {
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require.Equal(t, 0.0, v.Value)
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}
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}
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func TestWrite_SkipNonNumberField(t *testing.T) {
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client := NewClient()
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p1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": "howdy"},
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time.Now())
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err = client.Write([]telegraf.Metric{p1})
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require.NoError(t, err)
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_, ok := client.fam["foo"]
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require.False(t, ok)
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}
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func TestWrite_Counter(t *testing.T) {
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client := NewClient()
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p1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": 42},
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time.Now(),
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telegraf.Counter)
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err = client.Write([]telegraf.Metric{p1})
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require.NoError(t, err)
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fam, ok := client.fam["foo"]
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require.True(t, ok)
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require.Equal(t, prometheus.CounterValue, fam.ValueType)
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}
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func TestWrite_Sanitize(t *testing.T) {
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client := NewClient()
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p1, err := metric.New(
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"foo.bar",
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map[string]string{"tag-with-dash": "localhost.local"},
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map[string]interface{}{"field-with-dash": 42},
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time.Now(),
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telegraf.Counter)
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err = client.Write([]telegraf.Metric{p1})
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require.NoError(t, err)
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fam, ok := client.fam["foo_bar_field_with_dash"]
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require.True(t, ok)
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require.Equal(t, map[string]int{"tag_with_dash": 1}, fam.LabelSet)
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sample1, ok := fam.Samples[CreateSampleID(p1.Tags())]
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require.True(t, ok)
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require.Equal(t, map[string]string{
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"tag_with_dash": "localhost_local"}, sample1.Labels)
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}
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func TestWrite_Gauge(t *testing.T) {
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client := NewClient()
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p1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": 42},
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time.Now(),
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telegraf.Gauge)
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err = client.Write([]telegraf.Metric{p1})
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require.NoError(t, err)
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fam, ok := client.fam["foo"]
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require.True(t, ok)
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require.Equal(t, prometheus.GaugeValue, fam.ValueType)
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}
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func TestWrite_MixedValueType(t *testing.T) {
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now := time.Now()
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p1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": 1.0},
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now,
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telegraf.Counter)
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p2, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": 2.0},
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now,
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telegraf.Gauge)
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var metrics = []telegraf.Metric{p1, p2}
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client := NewClient()
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err = client.Write(metrics)
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require.NoError(t, err)
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fam, ok := client.fam["foo"]
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require.True(t, ok)
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require.Equal(t, 1, len(fam.Samples))
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}
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func TestWrite_Tags(t *testing.T) {
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now := time.Now()
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p1, err := metric.New(
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"foo",
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make(map[string]string),
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map[string]interface{}{"value": 1.0},
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now)
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p2, err := metric.New(
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"foo",
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map[string]string{"host": "localhost"},
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map[string]interface{}{"value": 2.0},
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now)
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var metrics = []telegraf.Metric{p1, p2}
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client := NewClient()
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err = client.Write(metrics)
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require.NoError(t, err)
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fam, ok := client.fam["foo"]
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require.True(t, ok)
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require.Equal(t, prometheus.UntypedValue, fam.ValueType)
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require.Equal(t, map[string]int{"host": 1}, fam.LabelSet)
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sample1, ok := fam.Samples[CreateSampleID(p1.Tags())]
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require.True(t, ok)
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require.Equal(t, 1.0, sample1.Value)
|
||||
require.True(t, now.Before(sample1.Expiration))
|
||||
|
||||
sample2, ok := fam.Samples[CreateSampleID(p2.Tags())]
|
||||
require.True(t, ok)
|
||||
|
||||
require.Equal(t, 2.0, sample2.Value)
|
||||
require.True(t, now.Before(sample2.Expiration))
|
||||
}
|
||||
|
||||
func TestExpire(t *testing.T) {
|
||||
client := NewClient()
|
||||
|
||||
p1, err := metric.New(
|
||||
"foo",
|
||||
make(map[string]string),
|
||||
map[string]interface{}{"value": 1.0},
|
||||
time.Now())
|
||||
setUnixTime(client, 0)
|
||||
err = client.Write([]telegraf.Metric{p1})
|
||||
require.NoError(t, err)
|
||||
|
||||
p2, err := metric.New(
|
||||
"bar",
|
||||
make(map[string]string),
|
||||
map[string]interface{}{"value": 2.0},
|
||||
time.Now())
|
||||
setUnixTime(client, 1)
|
||||
err = client.Write([]telegraf.Metric{p2})
|
||||
|
||||
setUnixTime(client, 61)
|
||||
require.Equal(t, 2, len(client.fam))
|
||||
client.Expire()
|
||||
require.Equal(t, 1, len(client.fam))
|
||||
}
|
||||
|
||||
func TestExpire_TagsNoDecrement(t *testing.T) {
|
||||
client := NewClient()
|
||||
|
||||
p1, err := metric.New(
|
||||
"foo",
|
||||
make(map[string]string),
|
||||
map[string]interface{}{"value": 1.0},
|
||||
time.Now())
|
||||
setUnixTime(client, 0)
|
||||
err = client.Write([]telegraf.Metric{p1})
|
||||
require.NoError(t, err)
|
||||
|
||||
p2, err := metric.New(
|
||||
"foo",
|
||||
map[string]string{"host": "localhost"},
|
||||
map[string]interface{}{"value": 2.0},
|
||||
time.Now())
|
||||
setUnixTime(client, 1)
|
||||
err = client.Write([]telegraf.Metric{p2})
|
||||
|
||||
setUnixTime(client, 61)
|
||||
fam, ok := client.fam["foo"]
|
||||
require.True(t, ok)
|
||||
require.Equal(t, 2, len(fam.Samples))
|
||||
client.Expire()
|
||||
require.Equal(t, 1, len(fam.Samples))
|
||||
|
||||
require.Equal(t, map[string]int{"host": 1}, fam.LabelSet)
|
||||
}
|
||||
|
||||
func TestExpire_TagsWithDecrement(t *testing.T) {
|
||||
client := NewClient()
|
||||
|
||||
p1, err := metric.New(
|
||||
"foo",
|
||||
map[string]string{"host": "localhost"},
|
||||
map[string]interface{}{"value": 1.0},
|
||||
time.Now())
|
||||
setUnixTime(client, 0)
|
||||
err = client.Write([]telegraf.Metric{p1})
|
||||
require.NoError(t, err)
|
||||
|
||||
p2, err := metric.New(
|
||||
"foo",
|
||||
make(map[string]string),
|
||||
map[string]interface{}{"value": 2.0},
|
||||
time.Now())
|
||||
setUnixTime(client, 1)
|
||||
err = client.Write([]telegraf.Metric{p2})
|
||||
|
||||
setUnixTime(client, 61)
|
||||
fam, ok := client.fam["foo"]
|
||||
require.True(t, ok)
|
||||
require.Equal(t, 2, len(fam.Samples))
|
||||
client.Expire()
|
||||
require.Equal(t, 1, len(fam.Samples))
|
||||
|
||||
require.Equal(t, map[string]int{"host": 0}, fam.LabelSet)
|
||||
}
|
||||
|
||||
var pTesting *PrometheusClient
|
||||
|
||||
func TestPrometheusWritePointEmptyTag(t *testing.T) {
|
||||
|
|
@ -93,74 +391,21 @@ func TestPrometheusWritePointEmptyTag(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
func TestPrometheusExpireOldMetrics(t *testing.T) {
|
||||
if testing.Short() {
|
||||
t.Skip("Skipping integration test in short mode")
|
||||
}
|
||||
|
||||
pClient, p, err := setupPrometheus()
|
||||
pClient.ExpirationInterval = internal.Duration{Duration: time.Second * 10}
|
||||
require.NoError(t, err)
|
||||
defer pClient.Stop()
|
||||
|
||||
now := time.Now()
|
||||
tags := make(map[string]string)
|
||||
pt1, _ := metric.New(
|
||||
"test_point_1",
|
||||
tags,
|
||||
map[string]interface{}{"value": 0.0},
|
||||
now)
|
||||
var metrics = []telegraf.Metric{pt1}
|
||||
require.NoError(t, pClient.Write(metrics))
|
||||
|
||||
for _, m := range pClient.metrics {
|
||||
m.Expiration = now.Add(time.Duration(-15) * time.Second)
|
||||
}
|
||||
|
||||
pt2, _ := metric.New(
|
||||
"test_point_2",
|
||||
tags,
|
||||
map[string]interface{}{"value": 1.0},
|
||||
now)
|
||||
var metrics2 = []telegraf.Metric{pt2}
|
||||
require.NoError(t, pClient.Write(metrics2))
|
||||
|
||||
expected := []struct {
|
||||
name string
|
||||
value float64
|
||||
tags map[string]string
|
||||
}{
|
||||
{"test_point_2", 1.0, tags},
|
||||
}
|
||||
|
||||
var acc testutil.Accumulator
|
||||
|
||||
require.NoError(t, p.Gather(&acc))
|
||||
for _, e := range expected {
|
||||
acc.AssertContainsFields(t, e.name,
|
||||
map[string]interface{}{"value": e.value})
|
||||
}
|
||||
|
||||
acc.AssertDoesNotContainMeasurement(t, "test_point_1")
|
||||
|
||||
// Confirm that it's not in the PrometheusClient map anymore
|
||||
assert.Equal(t, 1, len(pClient.metrics))
|
||||
}
|
||||
|
||||
func setupPrometheus() (*PrometheusClient, *prometheus.Prometheus, error) {
|
||||
func setupPrometheus() (*PrometheusClient, *prometheus_input.Prometheus, error) {
|
||||
if pTesting == nil {
|
||||
pTesting = &PrometheusClient{Listen: "localhost:9127"}
|
||||
pTesting = NewClient()
|
||||
pTesting.Listen = "localhost:9127"
|
||||
err := pTesting.Start()
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
} else {
|
||||
pTesting.metrics = make(map[string]*MetricWithExpiration)
|
||||
pTesting.fam = make(map[string]*MetricFamily)
|
||||
}
|
||||
|
||||
time.Sleep(time.Millisecond * 200)
|
||||
|
||||
p := &prometheus.Prometheus{
|
||||
p := &prometheus_input.Prometheus{
|
||||
Urls: []string{"http://localhost:9127/metrics"},
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue