github.com/thanos-io/thanos@v0.32.5/pkg/extprom/testing.go (about)

     1  // Copyright (c) The Thanos Authors.
     2  // Licensed under the Apache License 2.0.
     3  
     4  package extprom
     5  
     6  import (
     7  	"fmt"
     8  	"strings"
     9  	"testing"
    10  
    11  	"github.com/efficientgo/core/testutil"
    12  	"github.com/prometheus/client_golang/prometheus"
    13  )
    14  
    15  // CurrentGaugeValuesFor returns gauge values for given metric names. Useful for testing based on registry,
    16  // when you don't have access to metric variable.
    17  func CurrentGaugeValuesFor(t *testing.T, reg prometheus.Gatherer, metricNames ...string) map[string]float64 {
    18  	f, err := reg.Gather()
    19  	testutil.Ok(t, err)
    20  
    21  	res := make(map[string]float64, len(metricNames))
    22  	for _, g := range f {
    23  		for _, m := range metricNames {
    24  			if g.GetName() != m {
    25  				continue
    26  			}
    27  
    28  			for _, metric := range g.GetMetric() {
    29  				var lbls []string
    30  				for _, l := range metric.GetLabel() {
    31  					lbls = append(lbls, *l.Name+"="+*l.Value)
    32  				}
    33  
    34  				key := fmt.Sprintf("%s{%s}", m, strings.Join(lbls, ","))
    35  				if _, ok := res[key]; ok {
    36  					t.Fatal("duplicate metrics, should never happen with Prometheus Registry; key =", key)
    37  				}
    38  				if metric.GetGauge() == nil {
    39  					t.Fatal("metric is not a gauge; key =", key)
    40  				}
    41  				res[key] = *(metric.GetGauge().Value)
    42  			}
    43  		}
    44  	}
    45  	return res
    46  }