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// Copyright 2017 Google LLC. All Rights Reserved.
//
// 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 monitoring
import (
"fmt"
"strings"
"sync"
"k8s.io/klog/v2"
)
// InertMetricFactory creates inert metrics for testing.
type InertMetricFactory struct{}
// NewCounter creates a new inert Counter.
func (imf InertMetricFactory) NewCounter(name, help string, labelNames ...string) Counter {
return &InertFloat{
labelCount: len(labelNames),
vals: make(map[string]float64),
}
}
// NewGauge creates a new inert Gauge.
func (imf InertMetricFactory) NewGauge(name, help string, labelNames ...string) Gauge {
return &InertFloat{
labelCount: len(labelNames),
vals: make(map[string]float64),
}
}
// NewHistogram creates a new inert Histogram.
func (imf InertMetricFactory) NewHistogram(name, help string, labelNames ...string) Histogram {
return &InertDistribution{
labelCount: len(labelNames),
counts: make(map[string]uint64),
sums: make(map[string]float64),
}
}
// NewHistogramWithBuckets creates a new inert Histogram with supplied buckets.
// The buckets are not actually used.
func (imf InertMetricFactory) NewHistogramWithBuckets(name, help string, _ []float64, labelNames ...string) Histogram {
return imf.NewHistogram(name, help, labelNames...)
}
// InertFloat is an internal-only implementation of both the Counter and Gauge interfaces.
type InertFloat struct {
labelCount int
mu sync.Mutex
vals map[string]float64
}
// Inc adds 1 to the value.
func (m *InertFloat) Inc(labelVals ...string) {
m.Add(1.0, labelVals...)
}
// Dec subtracts 1 from the value.
func (m *InertFloat) Dec(labelVals ...string) {
m.Add(-1.0, labelVals...)
}
// Add adds the given amount to the value.
func (m *InertFloat) Add(val float64, labelVals ...string) {
m.mu.Lock()
defer m.mu.Unlock()
key, err := keyForLabels(labelVals, m.labelCount)
if err != nil {
klog.Error(err.Error())
return
}
m.vals[key] += val
}
// Set sets the value.
func (m *InertFloat) Set(val float64, labelVals ...string) {
m.mu.Lock()
defer m.mu.Unlock()
key, err := keyForLabels(labelVals, m.labelCount)
if err != nil {
klog.Error(err.Error())
return
}
m.vals[key] = val
}
// Value returns the current value.
func (m *InertFloat) Value(labelVals ...string) float64 {
m.mu.Lock()
defer m.mu.Unlock()
key, err := keyForLabels(labelVals, m.labelCount)
if err != nil {
klog.Error(err.Error())
return 0.0
}
return m.vals[key]
}
// InertDistribution is an internal-only implementation of the Distribution interface.
type InertDistribution struct {
labelCount int
mu sync.Mutex
counts map[string]uint64
sums map[string]float64
}
// Observe adds a single observation to the distribution.
func (m *InertDistribution) Observe(val float64, labelVals ...string) {
m.mu.Lock()
defer m.mu.Unlock()
key, err := keyForLabels(labelVals, m.labelCount)
if err != nil {
klog.Error(err.Error())
return
}
m.counts[key]++
m.sums[key] += val
}
// Info returns count, sum for the distribution.
func (m *InertDistribution) Info(labelVals ...string) (uint64, float64) {
m.mu.Lock()
defer m.mu.Unlock()
key, err := keyForLabels(labelVals, m.labelCount)
if err != nil {
klog.Error(err.Error())
return 0, 0.0
}
return m.counts[key], m.sums[key]
}
func keyForLabels(labelVals []string, count int) (string, error) {
if len(labelVals) != count {
return "", fmt.Errorf("invalid label count %d; want %d", len(labelVals), count)
}
return strings.Join(labelVals, "|"), nil
}
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