forked from grafana/loki
/
stats.go
402 lines (366 loc) · 9.82 KB
/
stats.go
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package usagestats
import (
"bytes"
"context"
"encoding/json"
"expvar"
"fmt"
"io"
"math"
"net/http"
"runtime"
"strings"
"sync"
"time"
"github.com/grafana/loki/pkg/util/build"
"github.com/cespare/xxhash/v2"
jsoniter "github.com/json-iterator/go"
prom "github.com/prometheus/prometheus/web/api/v1"
"go.uber.org/atomic"
)
var (
httpClient = http.Client{Timeout: 5 * time.Second}
usageStatsURL = "https://stats.grafana.org/loki-usage-report"
statsPrefix = "github.com/grafana/loki/"
targetKey = "target"
editionKey = "edition"
)
// Report is the JSON object sent to the stats server
type Report struct {
ClusterID string `json:"clusterID"`
CreatedAt time.Time `json:"createdAt"`
Interval time.Time `json:"interval"`
IntervalPeriod float64 `json:"intervalPeriod"`
Target string `json:"target"`
prom.PrometheusVersion `json:"version"`
Os string `json:"os"`
Arch string `json:"arch"`
Edition string `json:"edition"`
Metrics map[string]interface{} `json:"metrics"`
}
// sendReport sends the report to the stats server
func sendReport(ctx context.Context, seed *ClusterSeed, interval time.Time) error {
report := buildReport(seed, interval)
out, err := jsoniter.MarshalIndent(report, "", " ")
if err != nil {
return err
}
req, err := http.NewRequest(http.MethodPost, usageStatsURL, bytes.NewBuffer(out))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
resp, err := httpClient.Do(req.WithContext(ctx))
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode/100 != 2 {
data, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
return fmt.Errorf("failed to send usage stats: %s body: %s", resp.Status, string(data))
}
return nil
}
// buildReport builds the report to be sent to the stats server
func buildReport(seed *ClusterSeed, interval time.Time) Report {
var (
targetName string
editionName string
)
if target := expvar.Get(statsPrefix + targetKey); target != nil {
if target, ok := target.(*expvar.String); ok {
targetName = target.Value()
}
}
if edition := expvar.Get(statsPrefix + editionKey); edition != nil {
if edition, ok := edition.(*expvar.String); ok {
editionName = edition.Value()
}
}
return Report{
ClusterID: seed.UID,
PrometheusVersion: build.GetVersion(),
CreatedAt: seed.CreatedAt,
Interval: interval,
IntervalPeriod: reportInterval.Seconds(),
Os: runtime.GOOS,
Arch: runtime.GOARCH,
Target: targetName,
Edition: editionName,
Metrics: buildMetrics(),
}
}
// buildMetrics builds the metrics part of the report to be sent to the stats server
func buildMetrics() map[string]interface{} {
result := map[string]interface{}{
"memstats": memstats(),
"num_cpu": runtime.NumCPU(),
"num_goroutine": runtime.NumGoroutine(),
}
expvar.Do(func(kv expvar.KeyValue) {
if !strings.HasPrefix(kv.Key, statsPrefix) || kv.Key == statsPrefix+targetKey || kv.Key == statsPrefix+editionKey {
return
}
var value interface{}
switch v := kv.Value.(type) {
case *expvar.Int:
value = v.Value()
case *expvar.Float:
value = v.Value()
case *expvar.String:
value = v.Value()
case *Statistics:
value = v.Value()
case *Counter:
v.updateRate()
value = v.Value()
v.reset()
case *WordCounter:
value = v.Value()
default:
value = v.String()
}
result[strings.TrimPrefix(kv.Key, statsPrefix)] = value
})
return result
}
func memstats() interface{} {
stats := new(runtime.MemStats)
runtime.ReadMemStats(stats)
return map[string]interface{}{
"alloc": stats.Alloc,
"total_alloc": stats.TotalAlloc,
"sys": stats.Sys,
"heap_alloc": stats.HeapAlloc,
"heap_inuse": stats.HeapInuse,
"stack_inuse": stats.StackInuse,
"pause_total_ns": stats.PauseTotalNs,
"num_gc": stats.NumGC,
"gc_cpu_fraction": stats.GCCPUFraction,
}
}
// NewFloat returns a new Float stats object.
// If a Float stats object with the same name already exists it is returned.
func NewFloat(name string) *expvar.Float {
existing := expvar.Get(statsPrefix + name)
if existing != nil {
if f, ok := existing.(*expvar.Float); ok {
return f
}
panic(fmt.Sprintf("%v is set to a non-float value", name))
}
return expvar.NewFloat(statsPrefix + name)
}
// NewInt returns a new Int stats object.
// If an Int stats object object with the same name already exists it is returned.
func NewInt(name string) *expvar.Int {
existing := expvar.Get(statsPrefix + name)
if existing != nil {
if i, ok := existing.(*expvar.Int); ok {
return i
}
panic(fmt.Sprintf("%v is set to a non-int value", name))
}
return expvar.NewInt(statsPrefix + name)
}
// NewString returns a new String stats object.
// If a String stats object with the same name already exists it is returned.
func NewString(name string) *expvar.String {
existing := expvar.Get(statsPrefix + name)
if existing != nil {
if s, ok := existing.(*expvar.String); ok {
return s
}
panic(fmt.Sprintf("%v is set to a non-string value", name))
}
return expvar.NewString(statsPrefix + name)
}
// Target sets the target name. This can be set multiple times.
func Target(target string) {
NewString(targetKey).Set(target)
}
// Edition sets the edition name. This can be set multiple times.
func Edition(edition string) {
NewString(editionKey).Set(edition)
}
type Statistics struct {
min *atomic.Float64
max *atomic.Float64
count *atomic.Int64
avg *atomic.Float64
// require for stddev and stdvar
mean *atomic.Float64
value *atomic.Float64
}
// NewStatistics returns a new Statistics object.
// Statistics object is thread-safe and compute statistics on the fly based on sample recorded.
// Available statistics are:
// - min
// - max
// - avg
// - count
// - stddev
// - stdvar
// If a Statistics object with the same name already exists it is returned.
func NewStatistics(name string) *Statistics {
s := &Statistics{
min: atomic.NewFloat64(math.Inf(0)),
max: atomic.NewFloat64(math.Inf(-1)),
count: atomic.NewInt64(0),
avg: atomic.NewFloat64(0),
mean: atomic.NewFloat64(0),
value: atomic.NewFloat64(0),
}
existing := expvar.Get(statsPrefix + name)
if existing != nil {
if s, ok := existing.(*Statistics); ok {
return s
}
panic(fmt.Sprintf("%v is set to a non-Statistics value", name))
}
expvar.Publish(statsPrefix+name, s)
return s
}
func (s *Statistics) String() string {
b, _ := json.Marshal(s.Value())
return string(b)
}
func (s *Statistics) Value() map[string]interface{} {
stdvar := s.value.Load() / float64(s.count.Load())
stddev := math.Sqrt(stdvar)
min := s.min.Load()
max := s.max.Load()
result := map[string]interface{}{
"avg": s.avg.Load(),
"count": s.count.Load(),
}
if !math.IsInf(min, 0) {
result["min"] = min
}
if !math.IsInf(max, 0) {
result["max"] = s.max.Load()
}
if !math.IsNaN(stddev) {
result["stddev"] = stddev
}
if !math.IsNaN(stdvar) {
result["stdvar"] = stdvar
}
return result
}
func (s *Statistics) Record(v float64) {
for {
min := s.min.Load()
if min <= v {
break
}
if s.min.CAS(min, v) {
break
}
}
for {
max := s.max.Load()
if max >= v {
break
}
if s.max.CAS(max, v) {
break
}
}
for {
avg := s.avg.Load()
count := s.count.Load()
mean := s.mean.Load()
value := s.value.Load()
delta := v - mean
newCount := count + 1
newMean := mean + (delta / float64(newCount))
newValue := value + (delta * (v - newMean))
newAvg := avg + ((v - avg) / float64(newCount))
if s.avg.CAS(avg, newAvg) && s.count.CAS(count, newCount) && s.mean.CAS(mean, newMean) && s.value.CAS(value, newValue) {
break
}
}
}
type Counter struct {
total *atomic.Int64
rate *atomic.Float64
resetTime time.Time
}
// NewCounter returns a new Counter stats object.
// If a Counter stats object with the same name already exists it is returned.
func NewCounter(name string) *Counter {
c := &Counter{
total: atomic.NewInt64(0),
rate: atomic.NewFloat64(0),
resetTime: time.Now(),
}
existing := expvar.Get(statsPrefix + name)
if existing != nil {
if c, ok := existing.(*Counter); ok {
return c
}
panic(fmt.Sprintf("%v is set to a non-Counter value", name))
}
expvar.Publish(statsPrefix+name, c)
return c
}
func (c *Counter) updateRate() {
total := c.total.Load()
c.rate.Store(float64(total) / time.Since(c.resetTime).Seconds())
}
func (c *Counter) reset() {
c.total.Store(0)
c.rate.Store(0)
c.resetTime = time.Now()
}
func (c *Counter) Inc(i int64) {
c.total.Add(i)
}
func (c *Counter) String() string {
b, _ := json.Marshal(c.Value())
return string(b)
}
func (c *Counter) Value() map[string]interface{} {
return map[string]interface{}{
"total": c.total.Load(),
"rate": c.rate.Load(),
}
}
type WordCounter struct {
words sync.Map
count *atomic.Int64
}
// NewWordCounter returns a new WordCounter stats object.
// The WordCounter object is thread-safe and counts the number of words recorded.
// If a WordCounter stats object with the same name already exists it is returned.
func NewWordCounter(name string) *WordCounter {
c := &WordCounter{
count: atomic.NewInt64(0),
words: sync.Map{},
}
existing := expvar.Get(statsPrefix + name)
if existing != nil {
if w, ok := existing.(*WordCounter); ok {
return w
}
panic(fmt.Sprintf("%v is set to a non-WordCounter value", name))
}
expvar.Publish(statsPrefix+name, c)
return c
}
func (w *WordCounter) Add(word string) {
if _, loaded := w.words.LoadOrStore(xxhash.Sum64String(word), struct{}{}); !loaded {
w.count.Add(1)
}
}
func (w *WordCounter) String() string {
b, _ := json.Marshal(w.Value())
return string(b)
}
func (w *WordCounter) Value() int64 {
return w.count.Load()
}