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metric_matcher.go
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metric_matcher.go
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/*
* This file is part of the KubeVirt project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright The Kubevirt Authors
*
*/
package libmonitoring
import (
"fmt"
"github.com/machadovilaca/operator-observability/pkg/operatormetrics"
"github.com/onsi/gomega/format"
)
const (
prometheusMetricNameLabel = "__name__"
prometheusHistogramBucketSuffix = "_bucket"
)
type MetricMatcher struct {
Metric operatormetrics.Metric
Labels map[string]string
}
func (matcher *MetricMatcher) FailureMessage(actual interface{}) (message string) {
msg := format.Message(actual, "to contain metric", matcher.Metric.GetOpts().Name)
if matcher.Labels != nil {
msg += fmt.Sprintf(" with labels %v", matcher.Labels)
}
return msg
}
func (matcher *MetricMatcher) NegatedFailureMessage(actual interface{}) (message string) {
msg := format.Message(actual, "not to contain metric", matcher.Metric.GetOpts().Name)
if matcher.Labels != nil {
msg += fmt.Sprintf(" with labels %v", matcher.Labels)
}
return msg
}
func (matcher *MetricMatcher) Match(actual interface{}) (success bool, err error) {
actualMetric, ok := actual.(promResult)
if !ok {
return false, fmt.Errorf("metric matcher requires a libmonitoring.PromResult")
}
actualName, ok := actualMetric.Metric[prometheusMetricNameLabel]
if !ok {
return false, fmt.Errorf("metric matcher requires a map with %s key", prometheusMetricNameLabel)
}
nameToMatch := matcher.Metric.GetOpts().Name
if matcher.Metric.GetType() == operatormetrics.HistogramType || matcher.Metric.GetType() == operatormetrics.HistogramVecType {
nameToMatch = nameToMatch + prometheusHistogramBucketSuffix
}
if actualName != nameToMatch {
return false, nil
}
for k, v := range matcher.Labels {
actualValue, ok := actualMetric.Metric[k]
if !ok {
return false, nil
}
if actualValue != v {
return false, nil
}
}
return true, nil
}