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usage_counter.go
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usage_counter.go
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/*
Copyright NetFoundry Inc.
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
https://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 metrics
import (
"time"
)
type UsageSource interface {
GetIntervalId() string
GetTags() map[string]string
}
// A UsageCounter allows tracking usage bucketized by some interval
type UsageCounter interface {
Metric
Update(source UsageSource, usageType string, time time.Time, value uint64)
}
type usageReporter interface {
reportUsage(intervalStartUTC int64, intervalLength time.Duration, values map[string]*usageSet)
}
func newUsageCounter(name string,
intervalSize time.Duration,
ageThreshold time.Duration,
reporter usageReporter,
disposeF func(),
eventChan chan func()) *usageCounterImpl {
currentInterval := time.Now().Truncate(intervalSize).UTC().Unix()
currentCounters := map[string]*usageSet{}
intervalMap := map[int64]map[string]*usageSet{}
intervalMap[currentInterval] = currentCounters
intervalCounter := &usageCounterImpl{
name: name,
reporter: reporter,
intervalSize: intervalSize,
currentInterval: currentInterval,
currentValues: currentCounters,
intervalMap: intervalMap,
eventChan: eventChan,
ageThreshold: ageThreshold,
dispose: disposeF,
}
return intervalCounter
}
type usageSet struct {
values map[string]uint64
tags map[string]string
}
type usageCounterImpl struct {
name string
reporter usageReporter
intervalSize time.Duration
currentInterval int64
currentValues map[string]*usageSet
intervalMap map[int64]map[string]*usageSet
eventChan chan func()
ageThreshold time.Duration
dispose func()
}
func (self *usageCounterImpl) Update(source UsageSource, usageType string, time time.Time, value uint64) {
if value == 0 {
return
}
self.eventChan <- func() {
interval := time.Truncate(self.intervalSize).UTC().Unix()
valueMap := self.getValueMapForInterval(interval)
set := valueMap[source.GetIntervalId()]
if set == nil {
set = &usageSet{
values: map[string]uint64{},
tags: source.GetTags(),
}
valueMap[source.GetIntervalId()] = set
}
set.values[usageType] += value
}
}
func (self *usageCounterImpl) Dispose() {
self.dispose()
}
func (self *usageCounterImpl) getValueMapForInterval(interval int64) map[string]*usageSet {
if self.currentInterval == interval {
return self.currentValues
}
if result, found := self.intervalMap[interval]; found {
return result
}
result := map[string]*usageSet{}
self.intervalMap[interval] = result
if interval > self.currentInterval {
self.currentInterval = interval
self.currentValues = result
}
return result
}
func (self *usageCounterImpl) flushIntervals() {
threshold := time.Now().UTC().Add(-self.ageThreshold).Unix()
for interval, values := range self.intervalMap {
if interval < self.currentInterval || interval <= threshold {
if len(values) > 0 {
self.reporter.reportUsage(interval, self.intervalSize, values)
if interval == self.currentInterval {
self.currentValues = map[string]*usageSet{}
self.intervalMap[self.currentInterval] = self.currentValues
} else {
delete(self.intervalMap, interval)
}
} else {
delete(self.intervalMap, interval)
}
}
}
}