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insmetrics.go
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insmetrics.go
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/*
* Copyright 2019 Insolar Technologies
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package insmetrics
import (
"context"
"time"
"github.com/prometheus/client_golang/prometheus"
censusprom "go.opencensus.io/exporter/prometheus"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
"github.com/insolar/insolar/instrumentation/inslogger"
)
var TagNodeStaticRole = MustTagKey("role")
// 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 for tags modifiacations.
//
// 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
}
// RegisterPrometheus creates prometheus exporter and registers it in opencensus view lib.
func RegisterPrometheus(
ctx context.Context,
namespace string,
registry *prometheus.Registry,
reportperiod time.Duration,
nodeRole string,
) (*censusprom.Exporter, error) {
inslog := inslogger.FromContext(ctx)
exporter, err := censusprom.NewExporter(censusprom.Options{
Namespace: namespace,
Registry: registry,
OnError: func(err error) {
inslog.Error("Failed to export to Prometheus: ", err)
},
ConstLabels: prometheus.Labels{"role": nodeRole},
})
if err != nil {
return nil, err
}
view.RegisterExporter(exporter)
// TODO: make reporting period configurable
if reportperiod == 0 {
reportperiod = time.Second
}
view.SetReportingPeriod(reportperiod)
return exporter, nil
}