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counter.go
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counter.go
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// Copyright Istio Authors
//
// 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
//
// https://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 monitoring
import (
"context"
api "go.opentelemetry.io/otel/metric"
"istio.io/istio/pkg/log"
)
type counter struct {
baseMetric
c api.Float64Counter
// precomputedAddOption is just a precomputation to avoid allocations on each record call
precomputedAddOption []api.AddOption
}
var _ Metric = &counter{}
func newCounter(o options) *counter {
c, err := meter().Float64Counter(o.name,
api.WithDescription(o.description),
api.WithUnit(string(o.unit)))
if err != nil {
log.Fatalf("failed to create counter: %v", err)
}
r := &counter{c: c}
r.baseMetric = baseMetric{
name: o.name,
rest: r,
}
return r
}
func (f *counter) Record(value float64) {
f.runRecordHook(value)
if f.precomputedAddOption != nil {
f.c.Add(context.Background(), value, f.precomputedAddOption...)
} else {
f.c.Add(context.Background(), value)
}
}
func (f *counter) With(labelValues ...LabelValue) Metric {
attrs, set := rebuildAttributes(f.baseMetric, labelValues)
nm := &counter{
c: f.c,
precomputedAddOption: []api.AddOption{api.WithAttributeSet(set)},
}
nm.baseMetric = baseMetric{
name: f.name,
attrs: attrs,
rest: nm,
}
return nm
}