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// Copyright (c) 2021 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 statsd
import (
"fmt"
"math"
"strconv"
"time"
"github.com/cactus/go-statsd-client/v5/statsd"
tally "github.com/uber-go/tally/v4"
)
const (
// DefaultHistogramBucketNamePrecision is the default
// precision to use when formatting the metric name
// with the histogram bucket bound values.
DefaultHistogramBucketNamePrecision = uint(6)
)
type cactusStatsReporter struct {
statter statsd.Statter
sampleRate float32
bucketFmt string
}
// Options is a set of options for the tally reporter.
type Options struct {
// SampleRate is the metrics emission sample rate. If you
// do not set this value it will be set to 1.
SampleRate float32
// HistogramBucketNamePrecision is the precision to use when
// formatting the metric name with the histogram bucket bound values.
// By default this will be set to the const DefaultHistogramBucketPrecision.
HistogramBucketNamePrecision uint
}
// NewReporter wraps a statsd.Statter for use with tally. Use either
// statsd.NewClient or statsd.NewBufferedClient.
func NewReporter(statsd statsd.Statter, opts Options) tally.StatsReporter {
var nilSampleRate float32
if opts.SampleRate == nilSampleRate {
opts.SampleRate = 1.0
}
if opts.HistogramBucketNamePrecision == 0 {
opts.HistogramBucketNamePrecision = DefaultHistogramBucketNamePrecision
}
return &cactusStatsReporter{
statter: statsd,
sampleRate: opts.SampleRate,
bucketFmt: "%." + strconv.Itoa(int(opts.HistogramBucketNamePrecision)) + "f",
}
}
func (r *cactusStatsReporter) ReportCounter(name string, tags map[string]string, value int64) {
r.statter.Inc(name, value, r.sampleRate)
}
func (r *cactusStatsReporter) ReportGauge(name string, tags map[string]string, value float64) {
r.statter.Gauge(name, int64(value), r.sampleRate)
}
func (r *cactusStatsReporter) ReportTimer(name string, tags map[string]string, interval time.Duration) {
r.statter.TimingDuration(name, interval, r.sampleRate)
}
func (r *cactusStatsReporter) ReportHistogramValueSamples(
name string,
tags map[string]string,
buckets tally.Buckets,
bucketLowerBound,
bucketUpperBound float64,
samples int64,
) {
r.statter.Inc(
fmt.Sprintf("%s.%s-%s", name,
r.valueBucketString(bucketLowerBound),
r.valueBucketString(bucketUpperBound)),
samples, r.sampleRate)
}
func (r *cactusStatsReporter) ReportHistogramDurationSamples(
name string,
tags map[string]string,
buckets tally.Buckets,
bucketLowerBound,
bucketUpperBound time.Duration,
samples int64,
) {
r.statter.Inc(
fmt.Sprintf("%s.%s-%s", name,
r.durationBucketString(bucketLowerBound),
r.durationBucketString(bucketUpperBound)),
samples, r.sampleRate)
}
func (r *cactusStatsReporter) valueBucketString(
upperBound float64,
) string {
if upperBound == math.MaxFloat64 {
return "infinity"
}
if upperBound == -math.MaxFloat64 {
return "-infinity"
}
return fmt.Sprintf(r.bucketFmt, upperBound)
}
func (r *cactusStatsReporter) durationBucketString(
upperBound time.Duration,
) string {
if upperBound == time.Duration(math.MaxInt64) {
return "infinity"
}
if upperBound == time.Duration(math.MinInt64) {
return "-infinity"
}
return upperBound.String()
}
func (r *cactusStatsReporter) Capabilities() tally.Capabilities {
return r
}
func (r *cactusStatsReporter) Reporting() bool {
return true
}
func (r *cactusStatsReporter) Tagging() bool {
return false
}
func (r *cactusStatsReporter) Flush() {
// no-op
}
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