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metric_matcher.go
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/
metric_matcher.go
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/*
Copyright The KubeVirt Authors.
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.
*/
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
}