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downsampler.go
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downsampler.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package downsample
import (
"time"
"go.uber.org/zap/zapcore"
)
// Downsampler is a downsampler.
type Downsampler interface {
NewMetricsAppender() (MetricsAppender, error)
}
// MetricsAppender is a metrics appender that can build a samples
// appender, only valid to use with a single caller at a time.
type MetricsAppender interface {
// NextMetric progresses to building the next metric.
NextMetric()
// AddTag adds a tag to the current metric being built.
AddTag(name, value []byte)
// SamplesAppender returns a samples appender for the current
// metric built with the tags that have been set.
SamplesAppender(opts SampleAppenderOptions) (SamplesAppenderResult, error)
// Finalize finalizes the entire metrics appender for reuse.
Finalize()
}
// SamplesAppenderResult is the result from a SamplesAppender call.
type SamplesAppenderResult struct {
SamplesAppender SamplesAppender
IsDropPolicyApplied bool
}
// SampleAppenderOptions defines the options being used when constructing
// the samples appender for a metric.
type SampleAppenderOptions struct {
Override bool
OverrideRules SamplesAppenderOverrideRules
}
// SamplesAppenderOverrideRules provides override rules to
// use instead of matching against default and dynamic matched rules
// for an ID.
type SamplesAppenderOverrideRules struct {
MappingRules []AutoMappingRule
}
// SamplesAppender is a downsampling samples appender,
// that can only be called by a single caller at a time.
type SamplesAppender interface {
AppendCounterSample(value int64) error
AppendGaugeSample(value float64) error
AppendCounterTimedSample(t time.Time, value int64) error
AppendGaugeTimedSample(t time.Time, value float64) error
AppendTimerTimedSample(t time.Time, value float64) error
}
type downsampler struct {
opts DownsamplerOptions
agg agg
metricsAppenderOpts metricsAppenderOptions
}
type downsamplerOptions struct {
opts DownsamplerOptions
agg agg
}
func newDownsampler(opts downsamplerOptions) (*downsampler, error) {
if err := opts.opts.validate(); err != nil {
return nil, err
}
debugLogging := false
logger := opts.opts.InstrumentOptions.Logger()
if logger.Check(zapcore.DebugLevel, "debug") != nil {
debugLogging = true
}
metricsAppenderOpts := metricsAppenderOptions{
agg: opts.agg.aggregator,
clientRemote: opts.agg.clientRemote,
defaultStagedMetadatasProtos: opts.agg.defaultStagedMetadatasProtos,
clockOpts: opts.agg.clockOpts,
tagEncoderPool: opts.agg.pools.tagEncoderPool,
matcher: opts.agg.matcher,
metricTagsIteratorPool: opts.agg.pools.metricTagsIteratorPool,
debugLogging: debugLogging,
logger: logger,
}
return &downsampler{
opts: opts.opts,
agg: opts.agg,
metricsAppenderOpts: metricsAppenderOpts,
}, nil
}
func (d *downsampler) NewMetricsAppender() (MetricsAppender, error) {
metricsAppender := d.agg.pools.metricsAppenderPool.Get()
metricsAppender.reset(d.metricsAppenderOpts)
return metricsAppender, nil
}