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package solomon
import (
"encoding/binary"
"encoding/json"
"io"
"sort"
"sync"
"time"
"github.com/ydb-platform/ydb/library/go/core/metrics"
"github.com/ydb-platform/ydb/library/go/core/xerrors"
"go.uber.org/atomic"
)
var (
_ metrics.Histogram = (*Histogram)(nil)
_ metrics.Timer = (*Histogram)(nil)
_ Metric = (*Histogram)(nil)
)
type Histogram struct {
name string
metricType metricType
tags map[string]string
bucketBounds []float64
bucketValues []int64
infValue atomic.Int64
mutex sync.Mutex
timestamp *time.Time
useNameTag bool
}
type histogram struct {
Bounds []float64 `json:"bounds"`
Buckets []int64 `json:"buckets"`
Inf int64 `json:"inf,omitempty"`
}
func (h *histogram) writeHistogram(w io.Writer) error {
err := writeULEB128(w, uint32(len(h.Buckets)))
if err != nil {
return xerrors.Errorf("writeULEB128 size histogram buckets failed: %w", err)
}
for _, upperBound := range h.Bounds {
err = binary.Write(w, binary.LittleEndian, float64(upperBound))
if err != nil {
return xerrors.Errorf("binary.Write upper bound failed: %w", err)
}
}
for _, bucketValue := range h.Buckets {
err = binary.Write(w, binary.LittleEndian, uint64(bucketValue))
if err != nil {
return xerrors.Errorf("binary.Write histogram buckets failed: %w", err)
}
}
return nil
}
func (h *Histogram) RecordValue(value float64) {
boundIndex := sort.SearchFloat64s(h.bucketBounds, value)
if boundIndex < len(h.bucketValues) {
h.mutex.Lock()
h.bucketValues[boundIndex] += 1
h.mutex.Unlock()
} else {
h.infValue.Inc()
}
}
func (h *Histogram) RecordDuration(value time.Duration) {
h.RecordValue(value.Seconds())
}
func (h *Histogram) Reset() {
h.mutex.Lock()
defer h.mutex.Unlock()
h.bucketValues = make([]int64, len(h.bucketValues))
h.infValue.Store(0)
}
func (h *Histogram) Name() string {
return h.name
}
func (h *Histogram) getType() metricType {
return h.metricType
}
func (h *Histogram) getLabels() map[string]string {
return h.tags
}
func (h *Histogram) getValue() interface{} {
return histogram{
Bounds: h.bucketBounds,
Buckets: h.bucketValues,
}
}
func (h *Histogram) getTimestamp() *time.Time {
return h.timestamp
}
func (h *Histogram) getNameTag() string {
if h.useNameTag {
return "name"
} else {
return "sensor"
}
}
// MarshalJSON implements json.Marshaler.
func (h *Histogram) MarshalJSON() ([]byte, error) {
valuesCopy := make([]int64, len(h.bucketValues))
h.mutex.Lock()
copy(valuesCopy, h.bucketValues)
h.mutex.Unlock()
return json.Marshal(struct {
Type string `json:"type"`
Labels map[string]string `json:"labels"`
Histogram histogram `json:"hist"`
Timestamp *int64 `json:"ts,omitempty"`
}{
Type: h.metricType.String(),
Histogram: histogram{
Bounds: h.bucketBounds,
Buckets: valuesCopy,
Inf: h.infValue.Load(),
},
Labels: func() map[string]string {
labels := make(map[string]string, len(h.tags)+1)
labels[h.getNameTag()] = h.Name()
for k, v := range h.tags {
labels[k] = v
}
return labels
}(),
Timestamp: tsAsRef(h.timestamp),
})
}
// Snapshot returns independent copy on metric.
func (h *Histogram) Snapshot() Metric {
bucketBounds := make([]float64, len(h.bucketBounds))
bucketValues := make([]int64, len(h.bucketValues))
copy(bucketBounds, h.bucketBounds)
h.mutex.Lock()
copy(bucketValues, h.bucketValues)
h.mutex.Unlock()
return &Histogram{
name: h.name,
metricType: h.metricType,
tags: h.tags,
bucketBounds: bucketBounds,
bucketValues: bucketValues,
infValue: *atomic.NewInt64(h.infValue.Load()),
useNameTag: h.useNameTag,
}
}
// InitBucketValues cleans internal bucketValues and saves new values in order.
// Length of internal bucketValues stays unchanged.
// If length of slice in argument bucketValues more than length of internal one,
// the first extra element of bucketValues is stored in infValue.
func (h *Histogram) InitBucketValues(bucketValues []int64) {
h.mutex.Lock()
defer h.mutex.Unlock()
h.bucketValues = make([]int64, len(h.bucketValues))
h.infValue.Store(0)
copy(h.bucketValues, bucketValues)
if len(bucketValues) > len(h.bucketValues) {
h.infValue.Store(bucketValues[len(h.bucketValues)])
}
}
|
