138 lines
3.8 KiB
Go
138 lines
3.8 KiB
Go
// Copyright 2018, OpenCensus Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package stats
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import (
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"context"
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"go.opencensus.io/metric/metricdata"
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"go.opencensus.io/stats/internal"
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"go.opencensus.io/tag"
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)
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func init() {
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internal.SubscriptionReporter = func(measure string) {
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mu.Lock()
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measures[measure].subscribe()
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mu.Unlock()
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}
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}
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// Recorder provides an interface for exporting measurement information from
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// the static Record method by using the WithRecorder option.
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type Recorder interface {
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// Record records a set of measurements associated with the given tags and attachments.
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// The second argument is a `[]Measurement`.
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Record(*tag.Map, interface{}, map[string]interface{})
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}
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type recordOptions struct {
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attachments metricdata.Attachments
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mutators []tag.Mutator
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measurements []Measurement
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recorder Recorder
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}
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// WithAttachments applies provided exemplar attachments.
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func WithAttachments(attachments metricdata.Attachments) Options {
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return func(ro *recordOptions) {
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ro.attachments = attachments
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}
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}
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// WithTags applies provided tag mutators.
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func WithTags(mutators ...tag.Mutator) Options {
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return func(ro *recordOptions) {
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ro.mutators = mutators
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}
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}
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// WithMeasurements applies provided measurements.
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func WithMeasurements(measurements ...Measurement) Options {
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return func(ro *recordOptions) {
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ro.measurements = measurements
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}
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}
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// WithRecorder records the measurements to the specified `Recorder`, rather
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// than to the global metrics recorder.
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func WithRecorder(meter Recorder) Options {
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return func(ro *recordOptions) {
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ro.recorder = meter
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}
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}
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// Options apply changes to recordOptions.
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type Options func(*recordOptions)
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func createRecordOption(ros ...Options) *recordOptions {
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o := &recordOptions{}
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for _, ro := range ros {
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ro(o)
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}
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return o
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}
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// Record records one or multiple measurements with the same context at once.
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// If there are any tags in the context, measurements will be tagged with them.
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func Record(ctx context.Context, ms ...Measurement) {
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RecordWithOptions(ctx, WithMeasurements(ms...))
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}
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// RecordWithTags records one or multiple measurements at once.
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//
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// Measurements will be tagged with the tags in the context mutated by the mutators.
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// RecordWithTags is useful if you want to record with tag mutations but don't want
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// to propagate the mutations in the context.
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func RecordWithTags(ctx context.Context, mutators []tag.Mutator, ms ...Measurement) error {
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return RecordWithOptions(ctx, WithTags(mutators...), WithMeasurements(ms...))
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}
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// RecordWithOptions records measurements from the given options (if any) against context
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// and tags and attachments in the options (if any).
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// If there are any tags in the context, measurements will be tagged with them.
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func RecordWithOptions(ctx context.Context, ros ...Options) error {
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o := createRecordOption(ros...)
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if len(o.measurements) == 0 {
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return nil
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}
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recorder := internal.DefaultRecorder
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if o.recorder != nil {
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recorder = o.recorder.Record
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}
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if recorder == nil {
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return nil
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}
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record := false
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for _, m := range o.measurements {
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if m.desc.subscribed() {
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record = true
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break
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}
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}
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if !record {
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return nil
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}
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if len(o.mutators) > 0 {
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var err error
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if ctx, err = tag.New(ctx, o.mutators...); err != nil {
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return err
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}
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}
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recorder(tag.FromContext(ctx), o.measurements, o.attachments)
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return nil
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}
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