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|
package prometheusmetrics
import (
"fmt"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/rcrowley/go-metrics"
)
// PrometheusConfig provides a container with config parameters for the
// Prometheus Exporter
type PrometheusConfig struct {
namespace string
Registry metrics.Registry // Registry to be exported
subsystem string
promRegistry prometheus.Registerer //Prometheus registry
FlushInterval time.Duration //interval to update prom metrics
gauges map[string]prometheus.Gauge
gaugeVecs map[string]prometheus.GaugeVec
}
// NewPrometheusProvider returns a Provider that produces Prometheus metrics.
// Namespace and subsystem are applied to all produced metrics.
func NewPrometheusProvider(r metrics.Registry, namespace string, subsystem string, promRegistry prometheus.Registerer, FlushInterval time.Duration) *PrometheusConfig {
return &PrometheusConfig{
namespace: namespace,
subsystem: subsystem,
Registry: r,
promRegistry: promRegistry,
FlushInterval: FlushInterval,
gauges: make(map[string]prometheus.Gauge),
gaugeVecs: make(map[string]prometheus.GaugeVec),
}
}
func (c *PrometheusConfig) flattenKey(key string) string {
key = strings.Replace(key, " ", "_", -1)
key = strings.Replace(key, ".", "_", -1)
key = strings.Replace(key, "-", "_", -1)
key = strings.Replace(key, "=", "_", -1)
return key
}
func (c *PrometheusConfig) gaugeFromNameAndValue(name string, val float64) {
key := fmt.Sprintf("%s_%s_%s", c.namespace, c.subsystem, name)
g, ok := c.gauges[key]
if !ok {
g = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: c.flattenKey(c.namespace),
Subsystem: c.flattenKey(c.subsystem),
Name: c.flattenKey(name),
Help: name,
})
c.promRegistry.MustRegister(g)
c.gauges[key] = g
}
g.Set(val)
}
func (c *PrometheusConfig) histogramFromName(name string, snap metrics.Histogram) {
key := fmt.Sprintf("%s_%s_%s", c.namespace, c.subsystem, name)
g, ok := c.gaugeVecs[key]
if !ok {
g = *prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: c.flattenKey(c.namespace),
Subsystem: c.flattenKey(c.subsystem),
Name: c.flattenKey(name),
Help: name,
},
[]string{
"type",
},
)
c.promRegistry.MustRegister(g)
c.gaugeVecs[key] = g
}
g.WithLabelValues("count").Set(float64(snap.Count()))
g.WithLabelValues("max").Set(float64(snap.Max()))
g.WithLabelValues("min").Set(float64(snap.Min()))
g.WithLabelValues("mean").Set(snap.Mean())
g.WithLabelValues("stddev").Set(snap.StdDev())
g.WithLabelValues("perc75").Set(snap.Percentile(float64(75)))
g.WithLabelValues("perc95").Set(snap.Percentile(float64(95)))
g.WithLabelValues("perc99").Set(snap.Percentile(float64(99)))
g.WithLabelValues("perc999").Set(snap.Percentile(float64(99.9)))
g.WithLabelValues("sum").Set(float64(snap.Sum()))
g.WithLabelValues("variance").Set(float64(snap.Variance()))
}
func (c *PrometheusConfig) meterFromName(name string, snap metrics.Meter) {
key := fmt.Sprintf("%s_%s_%s", c.namespace, c.subsystem, name)
g, ok := c.gaugeVecs[key]
if !ok {
g = *prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: c.flattenKey(c.namespace),
Subsystem: c.flattenKey(c.subsystem),
Name: c.flattenKey(name),
Help: name,
},
[]string{
"type",
},
)
c.promRegistry.MustRegister(g)
c.gaugeVecs[key] = g
}
g.WithLabelValues("count").Set(float64(snap.Count()))
g.WithLabelValues("rate1").Set(snap.Rate1())
g.WithLabelValues("rate5").Set(snap.Rate5())
g.WithLabelValues("rate15").Set(snap.Rate15())
g.WithLabelValues("rate_mean").Set(snap.RateMean())
}
func (c *PrometheusConfig) timerFromName(name string, snap metrics.Timer) {
key := fmt.Sprintf("%s_%s_%s", c.namespace, c.subsystem, name)
g, ok := c.gaugeVecs[key]
if !ok {
g = *prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: c.flattenKey(c.namespace),
Subsystem: c.flattenKey(c.subsystem),
Name: c.flattenKey(name),
Help: name,
},
[]string{
"type",
},
)
c.promRegistry.MustRegister(g)
c.gaugeVecs[key] = g
}
g.WithLabelValues("count").Set(float64(snap.Count()))
g.WithLabelValues("max").Set(float64(snap.Max()))
g.WithLabelValues("min").Set(float64(snap.Min()))
g.WithLabelValues("mean").Set(snap.Mean())
g.WithLabelValues("stddev").Set(snap.StdDev())
g.WithLabelValues("perc75").Set(snap.Percentile(float64(75)))
g.WithLabelValues("perc95").Set(snap.Percentile(float64(95)))
g.WithLabelValues("perc99").Set(snap.Percentile(float64(99)))
g.WithLabelValues("perc999").Set(snap.Percentile(float64(99.9)))
g.WithLabelValues("sum").Set(float64(snap.Sum()))
g.WithLabelValues("variance").Set(float64(snap.Variance()))
g.WithLabelValues("rate1").Set(snap.Rate1())
g.WithLabelValues("rate5").Set(snap.Rate5())
g.WithLabelValues("rate15").Set(snap.Rate15())
g.WithLabelValues("rate_mean").Set(snap.RateMean())
}
func (c *PrometheusConfig) UpdatePrometheusMetrics() {
c.UpdatePrometheusMetricsOnce()
for _ = range time.Tick(c.FlushInterval) {
c.UpdatePrometheusMetricsOnce()
}
}
func (c *PrometheusConfig) UpdatePrometheusMetricsOnce() error {
c.Registry.Each(func(name string, i interface{}) {
switch metric := i.(type) {
case metrics.Counter:
c.gaugeFromNameAndValue(name, float64(metric.Count()))
case metrics.Gauge:
c.gaugeFromNameAndValue(name, float64(metric.Value()))
case metrics.GaugeFloat64:
c.gaugeFromNameAndValue(name, float64(metric.Value()))
case metrics.Histogram:
snap := metric.Snapshot()
c.histogramFromName(name, snap)
case metrics.Meter:
snap := metric.Snapshot()
c.meterFromName(name, snap)
case metrics.Timer:
snap := metric.Snapshot()
c.timerFromName(name, snap)
}
})
return nil
}
|
