348 lines
11 KiB
Go
348 lines
11 KiB
Go
// Copyright The OpenTelemetry 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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//go:generate stringer -type=InstrumentKind -trimprefix=InstrumentKind
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package metric // import "go.opentelemetry.io/otel/sdk/metric"
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/metric"
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"go.opentelemetry.io/otel/metric/embedded"
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"go.opentelemetry.io/otel/sdk/instrumentation"
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"go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
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)
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var (
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zeroInstrumentKind InstrumentKind
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zeroScope instrumentation.Scope
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)
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// InstrumentKind is the identifier of a group of instruments that all
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// performing the same function.
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type InstrumentKind uint8
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const (
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// instrumentKindUndefined is an undefined instrument kind, it should not
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// be used by any initialized type.
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instrumentKindUndefined InstrumentKind = iota // nolint:deadcode,varcheck,unused
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// InstrumentKindCounter identifies a group of instruments that record
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// increasing values synchronously with the code path they are measuring.
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InstrumentKindCounter
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// InstrumentKindUpDownCounter identifies a group of instruments that
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// record increasing and decreasing values synchronously with the code path
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// they are measuring.
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InstrumentKindUpDownCounter
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// InstrumentKindHistogram identifies a group of instruments that record a
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// distribution of values synchronously with the code path they are
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// measuring.
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InstrumentKindHistogram
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// InstrumentKindObservableCounter identifies a group of instruments that
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// record increasing values in an asynchronous callback.
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InstrumentKindObservableCounter
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// InstrumentKindObservableUpDownCounter identifies a group of instruments
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// that record increasing and decreasing values in an asynchronous
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// callback.
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InstrumentKindObservableUpDownCounter
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// InstrumentKindObservableGauge identifies a group of instruments that
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// record current values in an asynchronous callback.
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InstrumentKindObservableGauge
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)
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type nonComparable [0]func() // nolint: unused // This is indeed used.
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// Instrument describes properties an instrument is created with.
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type Instrument struct {
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// Name is the human-readable identifier of the instrument.
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Name string
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// Description describes the purpose of the instrument.
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Description string
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// Kind defines the functional group of the instrument.
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Kind InstrumentKind
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// Unit is the unit of measurement recorded by the instrument.
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Unit string
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// Scope identifies the instrumentation that created the instrument.
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Scope instrumentation.Scope
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// Ensure forward compatibility if non-comparable fields need to be added.
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nonComparable // nolint: unused
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}
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// empty returns if all fields of i are their zero-value.
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func (i Instrument) empty() bool {
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return i.Name == "" &&
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i.Description == "" &&
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i.Kind == zeroInstrumentKind &&
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i.Unit == "" &&
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i.Scope == zeroScope
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}
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// matches returns whether all the non-zero-value fields of i match the
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// corresponding fields of other. If i is empty it will match all other, and
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// true will always be returned.
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func (i Instrument) matches(other Instrument) bool {
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return i.matchesName(other) &&
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i.matchesDescription(other) &&
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i.matchesKind(other) &&
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i.matchesUnit(other) &&
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i.matchesScope(other)
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}
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// matchesName returns true if the Name of i is "" or it equals the Name of
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// other, otherwise false.
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func (i Instrument) matchesName(other Instrument) bool {
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return i.Name == "" || i.Name == other.Name
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}
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// matchesDescription returns true if the Description of i is "" or it equals
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// the Description of other, otherwise false.
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func (i Instrument) matchesDescription(other Instrument) bool {
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return i.Description == "" || i.Description == other.Description
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}
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// matchesKind returns true if the Kind of i is its zero-value or it equals the
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// Kind of other, otherwise false.
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func (i Instrument) matchesKind(other Instrument) bool {
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return i.Kind == zeroInstrumentKind || i.Kind == other.Kind
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}
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// matchesUnit returns true if the Unit of i is its zero-value or it equals the
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// Unit of other, otherwise false.
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func (i Instrument) matchesUnit(other Instrument) bool {
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return i.Unit == "" || i.Unit == other.Unit
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}
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// matchesScope returns true if the Scope of i is its zero-value or it equals
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// the Scope of other, otherwise false.
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func (i Instrument) matchesScope(other Instrument) bool {
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return (i.Scope.Name == "" || i.Scope.Name == other.Scope.Name) &&
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(i.Scope.Version == "" || i.Scope.Version == other.Scope.Version) &&
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(i.Scope.SchemaURL == "" || i.Scope.SchemaURL == other.Scope.SchemaURL)
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}
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// Stream describes the stream of data an instrument produces.
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type Stream struct {
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// Name is the human-readable identifier of the stream.
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Name string
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// Description describes the purpose of the data.
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Description string
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// Unit is the unit of measurement recorded.
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Unit string
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// Aggregation the stream uses for an instrument.
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Aggregation Aggregation
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// AttributeFilter is an attribute Filter applied to the attributes
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// recorded for an instrument's measurement. If the filter returns false
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// the attribute will not be recorded, otherwise, if it returns true, it
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// will record the attribute.
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//
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// Use NewAllowKeysFilter from "go.opentelemetry.io/otel/attribute" to
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// provide an allow-list of attribute keys here.
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AttributeFilter attribute.Filter
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}
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// instID are the identifying properties of a instrument.
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type instID struct {
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// Name is the name of the stream.
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Name string
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// Description is the description of the stream.
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Description string
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// Kind defines the functional group of the instrument.
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Kind InstrumentKind
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// Unit is the unit of the stream.
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Unit string
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// Number is the number type of the stream.
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Number string
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}
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// Returns a normalized copy of the instID i.
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//
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// Instrument names are considered case-insensitive. Standardize the instrument
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// name to always be lowercase for the returned instID so it can be compared
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// without the name casing affecting the comparison.
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func (i instID) normalize() instID {
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i.Name = strings.ToLower(i.Name)
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return i
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}
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type int64Inst struct {
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measures []aggregate.Measure[int64]
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embedded.Int64Counter
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embedded.Int64UpDownCounter
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embedded.Int64Histogram
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}
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var (
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_ metric.Int64Counter = (*int64Inst)(nil)
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_ metric.Int64UpDownCounter = (*int64Inst)(nil)
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_ metric.Int64Histogram = (*int64Inst)(nil)
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)
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func (i *int64Inst) Add(ctx context.Context, val int64, opts ...metric.AddOption) {
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c := metric.NewAddConfig(opts)
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i.aggregate(ctx, val, c.Attributes())
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}
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func (i *int64Inst) Record(ctx context.Context, val int64, opts ...metric.RecordOption) {
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c := metric.NewRecordConfig(opts)
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i.aggregate(ctx, val, c.Attributes())
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}
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func (i *int64Inst) aggregate(ctx context.Context, val int64, s attribute.Set) { // nolint:revive // okay to shadow pkg with method.
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if err := ctx.Err(); err != nil {
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return
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}
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for _, in := range i.measures {
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in(ctx, val, s)
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}
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}
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type float64Inst struct {
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measures []aggregate.Measure[float64]
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embedded.Float64Counter
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embedded.Float64UpDownCounter
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embedded.Float64Histogram
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}
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var (
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_ metric.Float64Counter = (*float64Inst)(nil)
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_ metric.Float64UpDownCounter = (*float64Inst)(nil)
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_ metric.Float64Histogram = (*float64Inst)(nil)
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)
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func (i *float64Inst) Add(ctx context.Context, val float64, opts ...metric.AddOption) {
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c := metric.NewAddConfig(opts)
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i.aggregate(ctx, val, c.Attributes())
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}
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func (i *float64Inst) Record(ctx context.Context, val float64, opts ...metric.RecordOption) {
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c := metric.NewRecordConfig(opts)
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i.aggregate(ctx, val, c.Attributes())
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}
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func (i *float64Inst) aggregate(ctx context.Context, val float64, s attribute.Set) {
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if err := ctx.Err(); err != nil {
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return
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}
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for _, in := range i.measures {
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in(ctx, val, s)
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}
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}
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// observablID is a comparable unique identifier of an observable.
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type observablID[N int64 | float64] struct {
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name string
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description string
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kind InstrumentKind
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unit string
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scope instrumentation.Scope
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}
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type float64Observable struct {
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metric.Float64Observable
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*observable[float64]
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embedded.Float64ObservableCounter
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embedded.Float64ObservableUpDownCounter
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embedded.Float64ObservableGauge
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}
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var (
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_ metric.Float64ObservableCounter = float64Observable{}
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_ metric.Float64ObservableUpDownCounter = float64Observable{}
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_ metric.Float64ObservableGauge = float64Observable{}
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)
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func newFloat64Observable(m *meter, kind InstrumentKind, name, desc, u string, meas []aggregate.Measure[float64]) float64Observable {
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return float64Observable{
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observable: newObservable(m, kind, name, desc, u, meas),
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}
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}
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type int64Observable struct {
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metric.Int64Observable
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*observable[int64]
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embedded.Int64ObservableCounter
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embedded.Int64ObservableUpDownCounter
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embedded.Int64ObservableGauge
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}
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var (
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_ metric.Int64ObservableCounter = int64Observable{}
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_ metric.Int64ObservableUpDownCounter = int64Observable{}
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_ metric.Int64ObservableGauge = int64Observable{}
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)
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func newInt64Observable(m *meter, kind InstrumentKind, name, desc, u string, meas []aggregate.Measure[int64]) int64Observable {
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return int64Observable{
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observable: newObservable(m, kind, name, desc, u, meas),
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}
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}
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type observable[N int64 | float64] struct {
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metric.Observable
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observablID[N]
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meter *meter
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measures []aggregate.Measure[N]
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}
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func newObservable[N int64 | float64](m *meter, kind InstrumentKind, name, desc, u string, meas []aggregate.Measure[N]) *observable[N] {
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return &observable[N]{
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observablID: observablID[N]{
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name: name,
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description: desc,
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kind: kind,
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unit: u,
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scope: m.scope,
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},
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meter: m,
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measures: meas,
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}
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}
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// observe records the val for the set of attrs.
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func (o *observable[N]) observe(val N, s attribute.Set) {
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for _, in := range o.measures {
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in(context.Background(), val, s)
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}
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}
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var errEmptyAgg = errors.New("no aggregators for observable instrument")
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// registerable returns an error if the observable o should not be registered,
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// and nil if it should. An errEmptyAgg error is returned if o is effectively a
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// no-op because it does not have any aggregators. Also, an error is returned
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// if scope defines a Meter other than the one o was created by.
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func (o *observable[N]) registerable(m *meter) error {
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if len(o.measures) == 0 {
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return errEmptyAgg
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}
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if m != o.meter {
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return fmt.Errorf(
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"invalid registration: observable %q from Meter %q, registered with Meter %q",
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o.name,
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o.scope.Name,
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m.scope.Name,
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)
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}
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return nil
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}
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