mirror of
https://github.com/superseriousbusiness/gotosocial.git
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5e871e81a8
* otel to 1.24 * prometheus exporter to 0.46 * bunotel to 1.1.17 Also: * Use schemaless URL for metrics * Add software version to tracing schema
108 lines
3 KiB
Go
108 lines
3 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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package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
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import (
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"context"
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"time"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/sdk/metric/metricdata"
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"go.opentelemetry.io/otel/trace"
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)
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// storage is an exemplar storage for [Reservoir] implementations.
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type storage[N int64 | float64] struct {
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// store are the measurements sampled.
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//
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// This does not use []metricdata.Exemplar because it potentially would
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// require an allocation for trace and span IDs in the hot path of Offer.
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store []measurement[N]
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}
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func newStorage[N int64 | float64](n int) *storage[N] {
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return &storage[N]{store: make([]measurement[N], n)}
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}
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// Collect returns all the held exemplars.
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//
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// The Reservoir state is preserved after this call.
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func (r *storage[N]) Collect(dest *[]metricdata.Exemplar[N]) {
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*dest = reset(*dest, len(r.store), len(r.store))
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var n int
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for _, m := range r.store {
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if !m.valid {
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continue
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}
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m.Exemplar(&(*dest)[n])
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n++
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}
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*dest = (*dest)[:n]
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}
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// measurement is a measurement made by a telemetry system.
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type measurement[N int64 | float64] struct {
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// FilteredAttributes are the attributes dropped during the measurement.
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FilteredAttributes []attribute.KeyValue
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// Time is the time when the measurement was made.
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Time time.Time
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// Value is the value of the measurement.
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Value N
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// SpanContext is the SpanContext active when a measurement was made.
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SpanContext trace.SpanContext
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valid bool
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}
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// newMeasurement returns a new non-empty Measurement.
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func newMeasurement[N int64 | float64](ctx context.Context, ts time.Time, v N, droppedAttr []attribute.KeyValue) measurement[N] {
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return measurement[N]{
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FilteredAttributes: droppedAttr,
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Time: ts,
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Value: v,
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SpanContext: trace.SpanContextFromContext(ctx),
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valid: true,
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}
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}
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// Exemplar returns m as a [metricdata.Exemplar].
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func (m measurement[N]) Exemplar(dest *metricdata.Exemplar[N]) {
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dest.FilteredAttributes = m.FilteredAttributes
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dest.Time = m.Time
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dest.Value = m.Value
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if m.SpanContext.HasTraceID() {
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traceID := m.SpanContext.TraceID()
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dest.TraceID = traceID[:]
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} else {
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dest.TraceID = dest.TraceID[:0]
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}
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if m.SpanContext.HasSpanID() {
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spanID := m.SpanContext.SpanID()
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dest.SpanID = spanID[:]
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} else {
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dest.SpanID = dest.SpanID[:0]
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}
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}
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func reset[T any](s []T, length, capacity int) []T {
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if cap(s) < capacity {
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return make([]T, length, capacity)
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}
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return s[:length]
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}
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