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instrument_provider.go
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instrument_provider.go
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// Copyright The OpenTelemetry 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 metric // import "go.opentelemetry.io/otel/sdk/metric"
import (
"fmt"
"go.opentelemetry.io/otel/metric/instrument"
"go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
"go.opentelemetry.io/otel/metric/instrument/asyncint64"
"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
"go.opentelemetry.io/otel/metric/instrument/syncint64"
"go.opentelemetry.io/otel/metric/unit"
"go.opentelemetry.io/otel/sdk/instrumentation"
"go.opentelemetry.io/otel/sdk/metric/view"
)
// instProviderKey uniquely describe a instrument from a providers perspective.
type instProviderKey struct {
// Name is the name of the instrument.
Name string
// Description is the description of the instrument.
Description string
// Unit is the unit of the instrument.
Unit unit.Unit
// Kind is the instrument Kind provided.
Kind view.InstrumentKind
}
func (k instProviderKey) viewInstrument(s instrumentation.Scope) view.Instrument {
return view.Instrument{
Scope: s,
Name: k.Name,
Description: k.Description,
Kind: k.Kind,
}
}
type instProvider[N int64 | float64] struct {
// cache ensures duplicate requests for the same instrument from this
// provider are returned quickly, without re-resolving Aggregators.
cache cache[instProviderKey, instVal[N]]
resolve *resolver[N]
}
func newInstProvider[N int64 | float64](s instrumentation.Scope, p pipelines, c *cache[string, any]) *instProvider[N] {
ac := newAggCache[N](c)
return &instProvider[N]{resolve: newResolver[N](s, p, ac)}
}
// lookup returns the instrumentImpl stored in the instProvider's cache for the
// provided arguments if it exists. Otherwise, it resolves a new instrument and
// sets it in the cache before returning it.
func (p *instProvider[N]) lookup(kind view.InstrumentKind, name string, opts []instrument.Option) (*instrumentImpl[N], error) {
cfg := instrument.NewConfig(opts...)
key := instProviderKey{Name: name, Description: cfg.Description(), Unit: cfg.Unit(), Kind: kind}
v := p.cache.Lookup(key, func() instVal[N] {
aggs, err := p.resolve.Aggregators(key)
if len(aggs) == 0 && err != nil {
err = fmt.Errorf("instrument does not match any view: %w", err)
}
return instVal[N]{
impl: &instrumentImpl[N]{aggregators: aggs},
err: err,
}
})
return v.impl, v.err
}
type instVal[N int64 | float64] struct {
impl *instrumentImpl[N]
err error
}
type asyncInt64Provider struct {
*instProvider[int64]
}
func newAsyncInt64Provider(s instrumentation.Scope, p pipelines, c *cache[string, any]) asyncInt64Provider {
return asyncInt64Provider{newInstProvider[int64](s, p, c)}
}
var _ asyncint64.InstrumentProvider = asyncInt64Provider{}
// Counter creates an instrument for recording increasing values.
func (p asyncInt64Provider) Counter(name string, opts ...instrument.Option) (asyncint64.Counter, error) {
return p.lookup(view.AsyncCounter, name, opts)
}
// UpDownCounter creates an instrument for recording changes of a value.
func (p asyncInt64Provider) UpDownCounter(name string, opts ...instrument.Option) (asyncint64.UpDownCounter, error) {
return p.lookup(view.AsyncUpDownCounter, name, opts)
}
// Gauge creates an instrument for recording the current value.
func (p asyncInt64Provider) Gauge(name string, opts ...instrument.Option) (asyncint64.Gauge, error) {
return p.lookup(view.AsyncGauge, name, opts)
}
type asyncFloat64Provider struct {
*instProvider[float64]
}
func newAsyncFloat64Provider(s instrumentation.Scope, p pipelines, c *cache[string, any]) asyncFloat64Provider {
return asyncFloat64Provider{newInstProvider[float64](s, p, c)}
}
var _ asyncfloat64.InstrumentProvider = asyncFloat64Provider{}
// Counter creates an instrument for recording increasing values.
func (p asyncFloat64Provider) Counter(name string, opts ...instrument.Option) (asyncfloat64.Counter, error) {
return p.lookup(view.AsyncCounter, name, opts)
}
// UpDownCounter creates an instrument for recording changes of a value.
func (p asyncFloat64Provider) UpDownCounter(name string, opts ...instrument.Option) (asyncfloat64.UpDownCounter, error) {
return p.lookup(view.AsyncUpDownCounter, name, opts)
}
// Gauge creates an instrument for recording the current value.
func (p asyncFloat64Provider) Gauge(name string, opts ...instrument.Option) (asyncfloat64.Gauge, error) {
return p.lookup(view.AsyncGauge, name, opts)
}
type syncInt64Provider struct {
*instProvider[int64]
}
func newSyncInt64Provider(s instrumentation.Scope, p pipelines, c *cache[string, any]) syncInt64Provider {
return syncInt64Provider{newInstProvider[int64](s, p, c)}
}
var _ syncint64.InstrumentProvider = syncInt64Provider{}
// Counter creates an instrument for recording increasing values.
func (p syncInt64Provider) Counter(name string, opts ...instrument.Option) (syncint64.Counter, error) {
return p.lookup(view.SyncCounter, name, opts)
}
// UpDownCounter creates an instrument for recording changes of a value.
func (p syncInt64Provider) UpDownCounter(name string, opts ...instrument.Option) (syncint64.UpDownCounter, error) {
return p.lookup(view.SyncUpDownCounter, name, opts)
}
// Histogram creates an instrument for recording the current value.
func (p syncInt64Provider) Histogram(name string, opts ...instrument.Option) (syncint64.Histogram, error) {
return p.lookup(view.SyncHistogram, name, opts)
}
type syncFloat64Provider struct {
*instProvider[float64]
}
func newSyncFloat64Provider(s instrumentation.Scope, p pipelines, c *cache[string, any]) syncFloat64Provider {
return syncFloat64Provider{newInstProvider[float64](s, p, c)}
}
var _ syncfloat64.InstrumentProvider = syncFloat64Provider{}
// Counter creates an instrument for recording increasing values.
func (p syncFloat64Provider) Counter(name string, opts ...instrument.Option) (syncfloat64.Counter, error) {
return p.lookup(view.SyncCounter, name, opts)
}
// UpDownCounter creates an instrument for recording changes of a value.
func (p syncFloat64Provider) UpDownCounter(name string, opts ...instrument.Option) (syncfloat64.UpDownCounter, error) {
return p.lookup(view.SyncUpDownCounter, name, opts)
}
// Histogram creates an instrument for recording the current value.
func (p syncFloat64Provider) Histogram(name string, opts ...instrument.Option) (syncfloat64.Histogram, error) {
return p.lookup(view.SyncHistogram, name, opts)
}