sigs.k8s.io/kueue@v0.6.2/pkg/util/testing/metrics/metrics.go (about)

     1  /*
     2  Copyright 2023 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package metrics
    18  
    19  import (
    20  	"sort"
    21  
    22  	"github.com/prometheus/client_golang/prometheus"
    23  	dto "github.com/prometheus/client_model/go"
    24  
    25  	"sigs.k8s.io/kueue/pkg/util/maps"
    26  	"sigs.k8s.io/kueue/pkg/util/slices"
    27  )
    28  
    29  type GaugeDataPoint struct {
    30  	Labels map[string]string
    31  	Value  float64
    32  }
    33  
    34  func (a *GaugeDataPoint) Less(b *GaugeDataPoint) bool {
    35  
    36  	keys := maps.Keys(a.Labels)
    37  	sort.Strings(keys)
    38  	for _, k := range keys {
    39  		vb, found := b.Labels[k]
    40  		if !found {
    41  			return false
    42  		}
    43  		va := a.Labels[k]
    44  		if va < vb {
    45  			return true
    46  		}
    47  		if vb < va {
    48  			return false
    49  		}
    50  	}
    51  
    52  	la := len(a.Labels)
    53  	lb := len(b.Labels)
    54  	if la < lb {
    55  		return true
    56  	}
    57  	if lb < la {
    58  		return false
    59  	}
    60  	return a.Value < b.Value
    61  
    62  }
    63  
    64  func CollectFilteredGaugeVec(v *prometheus.GaugeVec, labels map[string]string) []GaugeDataPoint {
    65  	if v == nil {
    66  		return nil
    67  	}
    68  
    69  	ch := make(chan prometheus.Metric)
    70  	ret := []GaugeDataPoint{}
    71  
    72  	go func() {
    73  		v.Collect(ch)
    74  		close(ch)
    75  	}()
    76  	for m := range ch {
    77  		// check if matches
    78  		dtoMetric := dto.Metric{}
    79  		if m.Write(&dtoMetric) == nil {
    80  			metricLabelsMap := slices.ToMap(dtoMetric.Label, func(i int) (string, string) { return *dtoMetric.Label[i].Name, *dtoMetric.Label[i].Value })
    81  			if maps.Contains(metricLabelsMap, labels) {
    82  				dp := GaugeDataPoint{
    83  					Labels: metricLabelsMap,
    84  					Value:  *dtoMetric.Gauge.Value,
    85  				}
    86  				ret = append(ret, dp)
    87  			}
    88  		}
    89  	}
    90  	return ret
    91  }