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package solomon
import (
"bytes"
"context"
"encoding"
"encoding/json"
"fmt"
"time"
"github.com/ydb-platform/ydb/library/go/core/xerrors"
"golang.org/x/exp/slices"
)
// Gather collects all metrics data via snapshots.
func (r Registry) Gather() (*Metrics, error) {
metrics := make([]Metric, 0)
var err error
r.metrics.Range(func(_, v interface{}) bool {
if s, ok := v.(Metric); ok {
metrics = append(metrics, s.Snapshot())
return true
}
err = fmt.Errorf("unexpected value type: %T", v)
return false
})
if err != nil {
return nil, err
}
return &Metrics{metrics: metrics}, nil
}
func NewMetrics(metrics []Metric) Metrics {
return Metrics{metrics: metrics}
}
func NewMetricsWithTimestamp(metrics []Metric, ts time.Time) Metrics {
return Metrics{metrics: metrics, timestamp: &ts}
}
type valueType uint8
const (
valueTypeNone valueType = iota
valueTypeOneWithoutTS valueType = 0x01
valueTypeOneWithTS valueType = 0x02
valueTypeManyWithTS valueType = 0x03
)
type metricType uint8
const (
typeUnspecified metricType = iota
typeGauge metricType = 0x01
typeCounter metricType = 0x02
typeRated metricType = 0x03
typeIGauge metricType = 0x04
typeHistogram metricType = 0x05
typeRatedHistogram metricType = 0x06
)
func (k metricType) String() string {
switch k {
case typeCounter:
return "COUNTER"
case typeGauge:
return "DGAUGE"
case typeIGauge:
return "IGAUGE"
case typeHistogram:
return "HIST"
case typeRated:
return "RATE"
case typeRatedHistogram:
return "HIST_RATE"
default:
panic("unknown metric type")
}
}
// Metric is an any abstract solomon Metric.
type Metric interface {
json.Marshaler
Name() string
getType() metricType
getLabels() map[string]string
getValue() interface{}
getNameTag() string
getTimestamp() *time.Time
Snapshot() Metric
}
// Rated marks given Solomon metric or vector as rated.
// Example:
//
// cnt := r.Counter("mycounter")
// Rated(cnt)
//
// cntvec := r.CounterVec("mycounter", []string{"mytag"})
// Rated(cntvec)
//
// For additional info: https://docs.yandex-team.ru/solomon/data-collection/dataformat/json
func Rated(s interface{}) {
switch st := s.(type) {
case *Counter:
st.metricType = typeRated
case *FuncCounter:
st.metricType = typeRated
case *Histogram:
st.metricType = typeRatedHistogram
case *CounterVec:
st.vec.rated = true
case *HistogramVec:
st.vec.rated = true
case *DurationHistogramVec:
st.vec.rated = true
}
// any other metrics types are unrateable
}
var (
_ json.Marshaler = (*Metrics)(nil)
_ encoding.BinaryMarshaler = (*Metrics)(nil)
)
type Metrics struct {
metrics []Metric
timestamp *time.Time
}
// MarshalJSON implements json.Marshaler.
func (s Metrics) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Metrics []Metric `json:"metrics"`
Timestamp *int64 `json:"ts,omitempty"`
}{s.metrics, tsAsRef(s.timestamp)})
}
// MarshalBinary implements encoding.BinaryMarshaler.
func (s Metrics) MarshalBinary() ([]byte, error) {
var buf bytes.Buffer
se := NewSpackEncoder(context.Background(), CompressionNone, &s)
n, err := se.Encode(&buf)
if err != nil {
return nil, xerrors.Errorf("encode only %d bytes: %w", n, err)
}
return buf.Bytes(), nil
}
// SplitToChunks splits Metrics into a slice of chunks, each at most maxChunkSize long.
// The length of returned slice is always at least one.
// Zero maxChunkSize denotes unlimited chunk length.
func (s Metrics) SplitToChunks(maxChunkSize int) []Metrics {
if maxChunkSize == 0 || len(s.metrics) == 0 {
return []Metrics{s}
}
chunks := make([]Metrics, 0, len(s.metrics)/maxChunkSize+1)
for leftBound := 0; leftBound < len(s.metrics); leftBound += maxChunkSize {
rightBound := leftBound + maxChunkSize
if rightBound > len(s.metrics) {
rightBound = len(s.metrics)
}
chunk := s.metrics[leftBound:rightBound]
chunks = append(chunks, Metrics{metrics: chunk})
}
return chunks
}
// List return list of metrics
func (s Metrics) List() []Metric {
return slices.Clone(s.metrics)
}
func tsAsRef(t *time.Time) *int64 {
if t == nil {
return nil
}
ts := t.Unix()
return &ts
}
|
