mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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132 lines
3.4 KiB
Go
132 lines
3.4 KiB
Go
// Copyright 2019, 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 ddsketch // import "go.opentelemetry.io/otel/sdk/metric/aggregator/ddsketch"
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import (
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"context"
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"math"
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"sync"
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sdk "github.com/DataDog/sketches-go/ddsketch"
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"go.opentelemetry.io/otel/api/core"
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export "go.opentelemetry.io/otel/sdk/export/metric"
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"go.opentelemetry.io/otel/sdk/metric/aggregator"
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)
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// Aggregator aggregates measure events.
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type Aggregator struct {
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lock sync.Mutex
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cfg *sdk.Config
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kind core.NumberKind
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current *sdk.DDSketch
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checkpoint *sdk.DDSketch
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}
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var _ export.Aggregator = &Aggregator{}
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// New returns a new DDSketch aggregator.
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func New(cfg *sdk.Config, desc *export.Descriptor) *Aggregator {
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return &Aggregator{
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cfg: cfg,
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kind: desc.NumberKind(),
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current: sdk.NewDDSketch(cfg),
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}
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}
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// NewDefaultConfig returns a new, default DDSketch config.
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//
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// TODO: The Config constructor should probably set minValue to -Inf
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// to aggregate metrics with absolute=false. This requires providing values
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// for alpha and maxNumBins
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func NewDefaultConfig() *sdk.Config {
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return sdk.NewDefaultConfig()
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}
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// Sum returns the sum of the checkpoint.
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func (c *Aggregator) Sum() core.Number {
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return c.toNumber(c.checkpoint.Sum())
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}
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// Count returns the count of the checkpoint.
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func (c *Aggregator) Count() int64 {
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return c.checkpoint.Count()
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}
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// Max returns the max of the checkpoint.
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func (c *Aggregator) Max() (core.Number, error) {
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return c.Quantile(1)
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}
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// Min returns the min of the checkpoint.
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func (c *Aggregator) Min() (core.Number, error) {
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return c.Quantile(0)
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}
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// Quantile returns the estimated quantile of the checkpoint.
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func (c *Aggregator) Quantile(q float64) (core.Number, error) {
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f := c.checkpoint.Quantile(q)
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if math.IsNaN(f) {
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return core.Number(0), aggregator.ErrInvalidQuantile
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}
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return c.toNumber(f), nil
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}
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func (c *Aggregator) toNumber(f float64) core.Number {
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if c.kind == core.Float64NumberKind {
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return core.NewFloat64Number(f)
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}
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return core.NewInt64Number(int64(f))
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}
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// Collect checkpoints the current value (atomically) and exports it.
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func (c *Aggregator) Collect(ctx context.Context, rec export.Record, exp export.Batcher) {
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replace := sdk.NewDDSketch(c.cfg)
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c.lock.Lock()
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c.checkpoint = c.current
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c.current = replace
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c.lock.Unlock()
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if c.checkpoint.Count() != 0 {
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exp.Export(ctx, rec, c)
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}
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}
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// Update modifies the current value (atomically) for later export.
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func (c *Aggregator) Update(_ context.Context, number core.Number, rec export.Record) {
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desc := rec.Descriptor()
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kind := desc.NumberKind()
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if !desc.Alternate() && number.IsNegative(kind) {
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// TODO warn
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return
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}
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c.lock.Lock()
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defer c.lock.Unlock()
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c.current.Add(number.CoerceToFloat64(kind))
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}
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func (c *Aggregator) Merge(oa export.Aggregator, d *export.Descriptor) {
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o, _ := oa.(*Aggregator)
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if o == nil {
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// TODO warn
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return
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}
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c.checkpoint.Merge(o.checkpoint)
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}
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