155 lines
3.2 KiB
Go
155 lines
3.2 KiB
Go
/*
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Copyright (c) 2012, Matt T. Proud
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All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file.
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*/
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package metrics
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import (
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"fmt"
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"github.com/matttproud/golang_instrumentation/utility"
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"sync"
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)
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// TODO(matt): Refactor to de-duplicate behaviors.
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type Counter interface {
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AsMarshallable() map[string]interface{}
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Decrement(labels map[string]string) float64
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DecrementBy(labels map[string]string, value float64) float64
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Increment(labels map[string]string) float64
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IncrementBy(labels map[string]string, value float64) float64
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ResetAll()
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Set(labels map[string]string, value float64) float64
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String() string
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}
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type counterValue struct {
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labels map[string]string
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value float64
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}
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func NewCounter() Counter {
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return &counter{
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values: map[string]*counterValue{},
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}
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}
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type counter struct {
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mutex sync.RWMutex
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values map[string]*counterValue
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}
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func (metric *counter) Set(labels map[string]string, value float64) float64 {
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metric.mutex.Lock()
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defer metric.mutex.Unlock()
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if labels == nil {
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labels = map[string]string{}
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}
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signature := utility.LabelsToSignature(labels)
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if original, ok := metric.values[signature]; ok {
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original.value = value
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} else {
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metric.values[signature] = &counterValue{
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labels: labels,
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value: value,
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}
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}
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return value
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}
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func (metric *counter) ResetAll() {
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metric.mutex.Lock()
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defer metric.mutex.Unlock()
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for key, value := range metric.values {
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for label := range value.labels {
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delete(value.labels, label)
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}
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delete(metric.values, key)
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}
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}
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func (metric *counter) String() string {
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formatString := "[Counter %s]"
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metric.mutex.RLock()
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defer metric.mutex.RUnlock()
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return fmt.Sprintf(formatString, metric.values)
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}
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func (metric *counter) IncrementBy(labels map[string]string, value float64) float64 {
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metric.mutex.Lock()
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defer metric.mutex.Unlock()
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if labels == nil {
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labels = map[string]string{}
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}
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signature := utility.LabelsToSignature(labels)
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if original, ok := metric.values[signature]; ok {
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original.value += value
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} else {
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metric.values[signature] = &counterValue{
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labels: labels,
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value: value,
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}
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}
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return value
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}
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func (metric *counter) Increment(labels map[string]string) float64 {
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return metric.IncrementBy(labels, 1)
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}
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func (metric *counter) DecrementBy(labels map[string]string, value float64) float64 {
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metric.mutex.Lock()
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defer metric.mutex.Unlock()
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if labels == nil {
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labels = map[string]string{}
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}
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signature := utility.LabelsToSignature(labels)
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if original, ok := metric.values[signature]; ok {
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original.value -= value
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} else {
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metric.values[signature] = &counterValue{
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labels: labels,
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value: -1 * value,
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}
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}
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return value
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}
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func (metric *counter) Decrement(labels map[string]string) float64 {
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return metric.DecrementBy(labels, 1)
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}
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func (metric *counter) AsMarshallable() map[string]interface{} {
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metric.mutex.RLock()
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defer metric.mutex.RUnlock()
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values := make([]map[string]interface{}, 0, len(metric.values))
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for _, value := range metric.values {
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values = append(values, map[string]interface{}{
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labelsKey: value.labels,
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valueKey: value.value,
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})
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}
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return map[string]interface{}{
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valueKey: values,
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typeKey: counterTypeValue,
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}
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}
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