forked from TrueCloudLab/distribution
105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
package gorelic
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import (
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"fmt"
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metrics "github.com/yvasiyarov/go-metrics"
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)
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const (
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histogramMin = iota
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histogramMax
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histogramMean
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histogramPercentile
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histogramStdDev
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histogramVariance
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noHistogramFunctions
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)
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type goMetricaDataSource struct {
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metrics.Registry
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}
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func (ds goMetricaDataSource) GetGaugeValue(key string) (float64, error) {
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if valueContainer := ds.Get(key); valueContainer == nil {
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return 0, fmt.Errorf("metrica with name %s is not registered\n", key)
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} else if gauge, ok := valueContainer.(metrics.Gauge); ok {
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return float64(gauge.Value()), nil
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} else {
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return 0, fmt.Errorf("metrica container has unexpected type: %T\n", valueContainer)
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}
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}
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func (ds goMetricaDataSource) GetHistogramValue(key string, statFunction int, percentile float64) (float64, error) {
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if valueContainer := ds.Get(key); valueContainer == nil {
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return 0, fmt.Errorf("metrica with name %s is not registered\n", key)
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} else if histogram, ok := valueContainer.(metrics.Histogram); ok {
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switch statFunction {
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default:
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return 0, fmt.Errorf("unsupported stat function for histogram: %s\n", statFunction)
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case histogramMax:
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return float64(histogram.Max()), nil
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case histogramMin:
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return float64(histogram.Min()), nil
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case histogramMean:
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return float64(histogram.Mean()), nil
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case histogramStdDev:
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return float64(histogram.StdDev()), nil
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case histogramVariance:
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return float64(histogram.Variance()), nil
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case histogramPercentile:
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return float64(histogram.Percentile(percentile)), nil
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}
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} else {
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return 0, fmt.Errorf("metrica container has unexpected type: %T\n", valueContainer)
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}
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}
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type baseGoMetrica struct {
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dataSource goMetricaDataSource
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basePath string
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name string
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units string
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dataSourceKey string
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}
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func (metrica *baseGoMetrica) GetName() string {
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return metrica.basePath + metrica.name
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}
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func (metrica *baseGoMetrica) GetUnits() string {
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return metrica.units
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}
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type gaugeMetrica struct {
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*baseGoMetrica
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}
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func (metrica *gaugeMetrica) GetValue() (float64, error) {
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return metrica.dataSource.GetGaugeValue(metrica.dataSourceKey)
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}
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type gaugeIncMetrica struct {
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*baseGoMetrica
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previousValue float64
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}
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func (metrica *gaugeIncMetrica) GetValue() (float64, error) {
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var value float64
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var currentValue float64
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var err error
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if currentValue, err = metrica.dataSource.GetGaugeValue(metrica.dataSourceKey); err == nil {
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value = currentValue - metrica.previousValue
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metrica.previousValue = currentValue
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}
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return value, err
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}
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type histogramMetrica struct {
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*baseGoMetrica
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statFunction int
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percentileValue float64
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}
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func (metrica *histogramMetrica) GetValue() (float64, error) {
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return metrica.dataSource.GetHistogramValue(metrica.dataSourceKey, metrica.statFunction, metrica.percentileValue)
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}
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