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// Copyright 2018, OpenCensus 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
//
// 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 stats
import (
"context"
"go.opencensus.io/exemplar"
"go.opencensus.io/stats/internal"
"go.opencensus.io/tag"
)
func init() {
internal.SubscriptionReporter = func(measure string) {
mu.Lock()
measures[measure].subscribe()
mu.Unlock()
}
}
// Record records one or multiple measurements with the same context at once.
// If there are any tags in the context, measurements will be tagged with them.
func Record(ctx context.Context, ms ...Measurement) {
recorder := internal.DefaultRecorder
if recorder == nil {
return
}
if len(ms) == 0 {
return
}
record := false
for _, m := range ms {
if m.desc.subscribed() {
record = true
break
}
}
if !record {
return
}
recorder(tag.FromContext(ctx), ms, exemplar.AttachmentsFromContext(ctx))
}
// RecordWithTags records one or multiple measurements at once.
//
// Measurements will be tagged with the tags in the context mutated by the mutators.
// RecordWithTags is useful if you want to record with tag mutations but don't want
// to propagate the mutations in the context.
func RecordWithTags(ctx context.Context, mutators []tag.Mutator, ms ...Measurement) error {
ctx, err := tag.New(ctx, mutators...)
if err != nil {
return err
}
Record(ctx, ms...)
return nil
}
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