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insmetrics.go
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insmetrics.go
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package insmetrics
import (
"context"
"time"
"contrib.go.opencensus.io/exporter/prometheus"
prometheusclient "github.com/prometheus/client_golang/prometheus"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
)
// MustTagKey creates new tag.Key, panics on error
func MustTagKey(key string) tag.Key {
k, err := tag.NewKey(key)
if err != nil {
panic(err)
}
return k
}
// InsertTag inserts (add) tag with provided value into context.
//
// Panics on error.
func InsertTag(ctx context.Context, key tag.Key, value string) context.Context {
return ChangeTags(ctx, tag.Insert(key, value))
}
// ChangeTags wrapper around opencensus tag.New which panics on any tag creation error.
//
// Panics on errors.
func ChangeTags(ctx context.Context, mutator ...tag.Mutator) context.Context {
ctx, err := tag.New(ctx, mutator...)
if err != nil {
panic(err)
}
return ctx
}
// Errorer is a logger with error
type Errorer interface {
Error(...interface{})
}
// RegisterPrometheus creates prometheus exporter and registers it in opencensus view lib.
func RegisterPrometheus(
namespace string,
registry *prometheusclient.Registry,
reportperiod time.Duration,
logger Errorer,
nodeRole string,
) (*prometheus.Exporter, error) {
exporter, err := prometheus.NewExporter(prometheus.Options{
Namespace: namespace,
Registry: registry,
OnError: func(err error) {
logger.Error("Failed to export to Prometheus: ", err)
},
ConstLabels: prometheusclient.Labels{"role": nodeRole},
})
if err != nil {
return nil, err
}
view.RegisterExporter(exporter)
if reportperiod == 0 {
reportperiod = time.Second
}
view.SetReportingPeriod(reportperiod)
return exporter, nil
}