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reactive-autoscaler-service.go
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reactive-autoscaler-service.go
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package autoscaler
import (
"container/ring"
"custom-hpa/metrics"
"custom-hpa/model"
"math"
"time"
)
func EvaluateAutoscalingReactive(
resultChannel metrics.TestResultsChannel,
metric model.AutoscalingDefinitionMetric) AutoscaleEvaluationResult {
autoscaleEvaluationChannel := make(chan AutoscaleEvaluation)
closeEvaluationProcessChannel := make(chan bool)
clearBufferChannel := make(chan bool)
go func() {
var resultBuffer = ring.New(metric.NumOfTests)
var requiredPositiveTests = int(math.Round(float64(metric.NumOfTests+1) / 2.0))
for {
select {
case testResult := <-resultChannel.TestResultsChannel:
resultBuffer.Value = testResult
resultBuffer = resultBuffer.Next()
ae := checkBuffer(resultBuffer, requiredPositiveTests)
ae.Metric = metric
autoscaleEvaluationChannel <- ae
resultBuffer.Value = nil
case <-closeEvaluationProcessChannel:
return
case <-clearBufferChannel:
clearBuffer(resultBuffer)
}
}
}()
return AutoscaleEvaluationResult{
AutoscaleEvaluation: autoscaleEvaluationChannel,
CloseEvaluationProcessChannel: closeEvaluationProcessChannel,
ClearBufferChannel: clearBufferChannel,
}
}
func fillDefinitionsDefaultValues(definition *model.AutoscalingDefinition) {
if definition.Spec.MinReplicas <= 0 {
definition.Spec.MinReplicas = 1
}
if definition.Spec.MaxReplicas <= 0 {
definition.Spec.MaxReplicas = 1
}
if definition.Spec.ScalingStep <= 0 {
definition.Spec.ScalingStep = 1
}
if _, err := time.ParseDuration(definition.Spec.IntervalBetweenAutoscaling); len(definition.Spec.IntervalBetweenAutoscaling) <= 0 || err != nil {
definition.Spec.IntervalBetweenAutoscaling = "2m"
}
if len(definition.Spec.ScaleTarget.MatchNamespace) <= 0 {
definition.Spec.ScaleTarget.MatchNamespace = "default"
}
if len(definition.Spec.ScaleTarget.TargetType) <= 0 {
definition.Spec.ScaleTarget.TargetType = "deployment"
}
}
func checkBuffer(buffer *ring.Ring, requiredPositiveTests int) AutoscaleEvaluation {
if !isBufferFilled(buffer) {
return AutoscaleEvaluation{
ScaleDown: false,
ScaleUp: false,
}
}
var scaleUpCounter = 0
var scaleDownCounter = 0
buffer.Do(func(item interface{}) {
var testResult = item.(metrics.TestResult)
if &testResult != nil {
if testResult.LowerBoundTestPassed {
scaleDownCounter++
}
if testResult.UpperBoundTestPassed {
scaleUpCounter++
}
}
})
var result = AutoscaleEvaluation{
ScaleDown: false,
ScaleUp: false,
}
if scaleDownCounter >= requiredPositiveTests {
result.ScaleDown = true
}
if scaleUpCounter >= requiredPositiveTests {
result.ScaleUp = true
}
return result
}