gotosocial/vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/lastvalue.go
Daenney 5e871e81a8
[chore] Update usage of OTEL libraries (#2725)
* 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
2024-03-11 15:34:34 +01:00

90 lines
2.3 KiB
Go

// 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 aggregate // import "go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
import (
"context"
"sync"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
// datapoint is timestamped measurement data.
type datapoint[N int64 | float64] struct {
timestamp time.Time
value N
res exemplar.Reservoir[N]
}
func newLastValue[N int64 | float64](limit int, r func() exemplar.Reservoir[N]) *lastValue[N] {
return &lastValue[N]{
newRes: r,
limit: newLimiter[datapoint[N]](limit),
values: make(map[attribute.Set]datapoint[N]),
}
}
// lastValue summarizes a set of measurements as the last one made.
type lastValue[N int64 | float64] struct {
sync.Mutex
newRes func() exemplar.Reservoir[N]
limit limiter[datapoint[N]]
values map[attribute.Set]datapoint[N]
}
func (s *lastValue[N]) measure(ctx context.Context, value N, fltrAttr attribute.Set, droppedAttr []attribute.KeyValue) {
t := now()
s.Lock()
defer s.Unlock()
attr := s.limit.Attributes(fltrAttr, s.values)
d, ok := s.values[attr]
if !ok {
d.res = s.newRes()
}
d.timestamp = t
d.value = value
d.res.Offer(ctx, t, value, droppedAttr)
s.values[attr] = d
}
func (s *lastValue[N]) computeAggregation(dest *[]metricdata.DataPoint[N]) {
s.Lock()
defer s.Unlock()
n := len(s.values)
*dest = reset(*dest, n, n)
var i int
for a, v := range s.values {
(*dest)[i].Attributes = a
// The event time is the only meaningful timestamp, StartTime is
// ignored.
(*dest)[i].Time = v.timestamp
(*dest)[i].Value = v.value
v.res.Collect(&(*dest)[i].Exemplars)
// Do not report stale values.
delete(s.values, a)
i++
}
}