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|
package metrics
import (
"fmt"
"github.com/prometheus/client_golang/prometheus"
"github.com/spiral/roadrunner/service"
)
// Config configures metrics service.
type Config struct {
// Address to listen
Address string
// Collect define application specific metrics.
Collect map[string]Collector
}
// Collector describes single application specific metric.
type Collector struct {
// Namespace of the metric.
Namespace string
// Subsystem of the metric.
Subsystem string
// Collector type (histogram, gauge, counter, summary).
Type string
// Help of collector.
Help string
// Labels for vectorized metrics.
Labels []string
// Buckets for histogram metric.
Buckets []float64
}
// Hydrate configuration.
func (c *Config) Hydrate(cfg service.Config) error {
return cfg.Unmarshal(c)
}
// register application specific metrics.
func (c *Config) getCollectors() (map[string]prometheus.Collector, error) {
if c.Collect == nil {
return nil, nil
}
collectors := make(map[string]prometheus.Collector)
for name, m := range c.Collect {
var collector prometheus.Collector
switch m.Type {
case "histogram":
opts := prometheus.HistogramOpts{
Name: name,
Namespace: m.Namespace,
Subsystem: m.Subsystem,
Help: m.Help,
Buckets: m.Buckets,
}
if len(m.Labels) != 0 {
collector = prometheus.NewHistogramVec(opts, m.Labels)
} else {
collector = prometheus.NewHistogram(opts)
}
case "gauge":
opts := prometheus.GaugeOpts{
Name: name,
Namespace: m.Namespace,
Subsystem: m.Subsystem,
Help: m.Help,
}
if len(m.Labels) != 0 {
collector = prometheus.NewGaugeVec(opts, m.Labels)
} else {
collector = prometheus.NewGauge(opts)
}
case "counter":
opts := prometheus.CounterOpts{
Name: name,
Namespace: m.Namespace,
Subsystem: m.Subsystem,
Help: m.Help,
}
if len(m.Labels) != 0 {
collector = prometheus.NewCounterVec(opts, m.Labels)
} else {
collector = prometheus.NewCounter(opts)
}
case "summary":
opts := prometheus.SummaryOpts{
Name: name,
Namespace: m.Namespace,
Subsystem: m.Subsystem,
Help: m.Help,
}
if len(m.Labels) != 0 {
collector = prometheus.NewSummaryVec(opts, m.Labels)
} else {
collector = prometheus.NewSummary(opts)
}
default:
return nil, fmt.Errorf("invalid metric type `%s` for `%s`", m.Type, name)
}
collectors[name] = collector
}
return collectors, nil
}
|
