/
metrics.go
80 lines (74 loc) · 2.08 KB
/
metrics.go
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package metrics
import (
"fmt"
"github.com/fabiolb/fabio/config"
gkm "github.com/go-kit/kit/metrics"
"log"
"strings"
)
// Provider is an abstraction of a metrics backend.
type Provider interface {
// NewCounter creates a new counter object.
NewCounter(name string, labels ...string) gkm.Counter
// NewGauge creates a new gauge object.
NewGauge(name string, labels ...string) gkm.Gauge
// NewHistogram creates a new histogram object
NewHistogram(name string, labels ...string) gkm.Histogram
}
func Initialize(cfg *config.Metrics) (Provider, error) {
var p []Provider
var prefix string
var err error
if prefix, err = parsePrefix(cfg.Prefix); err != nil {
return nil, fmt.Errorf("metrics: invalid Prefix template: %w", err)
}
for _, x := range strings.Split(cfg.Target, ",") {
x = strings.TrimSpace(x)
switch x {
case "flat", "stdout":
p = append(p, &flatProvider{prefix})
case "label":
p = append(p, &labelProvider{prefix})
case "statsd_raw":
pp, err := NewStatsdProvider(prefix, cfg.StatsDAddr, cfg.Interval)
if err != nil {
return nil, err
}
p = append(p, pp)
case "statsd":
return nil, fmt.Errorf("statsd support has been removed in favor of statsd_raw")
case "dogstatsd":
pp, err := NewDogstatsdProvider(prefix, cfg.DogstatsdAddr, cfg.Interval)
if err != nil {
return nil, err
}
p = append(p, pp)
case "prometheus":
p = append(p, NewPromProvider(prefix, cfg.Prometheus.Subsystem, cfg.Prometheus.Buckets))
case "circonus":
pp, err := NewCirconusProvider(prefix, cfg.Circonus, cfg.Interval)
if err != nil {
return nil, err
}
p = append(p, pp)
case "graphite":
pp, err := NewGraphiteProvider(prefix, cfg.GraphiteAddr, 50, cfg.Interval)
if err != nil {
return nil, err
}
p = append(p, pp)
case "":
// metrics are disabled.
default:
return nil, fmt.Errorf("invalid metrics backend %s", x)
}
log.Printf("[INFO] Registering metrics provider %q", x)
if len(p) == 0 {
log.Printf("[INFO] Metrics disabled")
}
}
if len(p) == 0 {
return &DiscardProvider{}, nil
}
return NewMultiProvider(p), nil
}