1
0
mirror of https://github.com/open-telemetry/opentelemetry-go.git synced 2024-12-16 10:19:23 +02:00
opentelemetry-go/api/metric/common.go

117 lines
3.2 KiB
Go
Raw Normal View History

// Copyright The OpenTelemetry Authors
2019-06-14 22:09:41 +02:00
//
// 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 metric
import (
"context"
"errors"
"go.opentelemetry.io/otel/api/core"
)
type syncInstrument struct {
instrument SyncImpl
}
type syncBoundInstrument struct {
boundInstrument BoundSyncImpl
}
type asyncInstrument struct {
instrument AsyncImpl
}
var ErrSDKReturnedNilImpl = errors.New("SDK returned a nil implementation")
func (s syncInstrument) bind(labels []core.KeyValue) syncBoundInstrument {
return newSyncBoundInstrument(s.instrument.Bind(labels))
}
func (s syncInstrument) float64Measurement(value float64) Measurement {
return newMeasurement(s.instrument, core.NewFloat64Number(value))
}
func (s syncInstrument) int64Measurement(value int64) Measurement {
return newMeasurement(s.instrument, core.NewInt64Number(value))
}
func (s syncInstrument) directRecord(ctx context.Context, number core.Number, labels []core.KeyValue) {
s.instrument.RecordOne(ctx, number, labels)
}
func (s syncInstrument) SyncImpl() SyncImpl {
return s.instrument
}
func (h syncBoundInstrument) directRecord(ctx context.Context, number core.Number) {
h.boundInstrument.RecordOne(ctx, number)
}
func (h syncBoundInstrument) Unbind() {
h.boundInstrument.Unbind()
}
func (a asyncInstrument) AsyncImpl() AsyncImpl {
return a.instrument
}
// checkNewSync receives an SyncImpl and potential
// error, and returns the same types, checking for and ensuring that
// the returned interface is not nil.
func checkNewSync(instrument SyncImpl, err error) (syncInstrument, error) {
if instrument == nil {
if err == nil {
err = ErrSDKReturnedNilImpl
}
// Note: an alternate behavior would be to synthesize a new name
// or group all duplicately-named instruments of a certain type
// together and use a tag for the original name, e.g.,
// name = 'invalid.counter.int64'
// label = 'original-name=duplicate-counter-name'
instrument = NoopSync{}
}
return syncInstrument{
instrument: instrument,
}, err
}
func newSyncBoundInstrument(boundInstrument BoundSyncImpl) syncBoundInstrument {
return syncBoundInstrument{
boundInstrument: boundInstrument,
}
}
func newMeasurement(instrument SyncImpl, number core.Number) Measurement {
return Measurement{
instrument: instrument,
number: number,
}
}
// checkNewAsync receives an AsyncImpl and potential
// error, and returns the same types, checking for and ensuring that
// the returned interface is not nil.
func checkNewAsync(instrument AsyncImpl, err error) (asyncInstrument, error) {
if instrument == nil {
if err == nil {
err = ErrSDKReturnedNilImpl
}
instrument = NoopAsync{}
}
return asyncInstrument{
instrument: instrument,
}, err
}