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stats.go
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stats.go
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/*************************************************************************
* Copyright 2024 Gravwell, Inc. All rights reserved.
* Contact: <legal@gravwell.io>
*
* This software may be modified and distributed under the terms of the
* BSD 2-clause license. See the LICENSE file for details.
**************************************************************************/
package utils
import (
"context"
"errors"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/crewjam/rfc5424"
"github.com/gravwell/gravwell/v3/ingest/log"
)
const (
statsMsg = `ingest stats`
statsIntervalName = `sample-interval-ms`
)
type StatsItem struct {
name string
last uint64
curr uint64
}
type StatsManager struct {
sync.Mutex
lgr *log.Logger
started bool
interval time.Duration
wg sync.WaitGroup
ctx context.Context
cf context.CancelFunc
items []*StatsItem
}
func NewStatsManager(interval time.Duration, lgr *log.Logger) (*StatsManager, error) {
if interval < 0 {
return nil, errors.New("invalid interval")
} else if lgr == nil {
return nil, errors.New("invalid logger")
}
ctx, cf := context.WithCancel(context.Background())
return &StatsManager{
interval: interval,
lgr: lgr,
wg: sync.WaitGroup{},
ctx: ctx,
cf: cf,
}, nil
}
func (sm *StatsManager) Start() error {
sm.Lock()
defer sm.Unlock()
if sm.started {
return errors.New("manager already started")
}
sm.started = true
sm.wg.Add(1)
go sm.routine()
return nil
}
func (sm *StatsManager) Stop() {
var doWait bool
//if active, throw final stats
sm.Lock()
if sm.started {
sm.cf()
sm.started = false
doWait = true
}
sm.Unlock()
if doWait {
sm.wg.Wait()
}
}
func (sm *StatsManager) RegisterItem(name string) (si *StatsItem, err error) {
if name == `` {
return nil, errors.New("missing name")
}
sm.Lock()
defer sm.Unlock()
for _, v := range sm.items {
if name == v.name {
err = fmt.Errorf("StatsItem %v already registered", name)
return
}
}
si = &StatsItem{
name: name,
}
sm.items = append(sm.items, si)
return
}
func (sm *StatsManager) routine() {
defer sm.wg.Done()
if sm.interval <= 0 {
return // we are actively being used, so just bail
}
tckr := time.NewTicker(sm.interval)
ts := time.Now()
loop:
for {
select {
case now := <-tckr.C:
sm.doTick(now.Sub(ts))
ts = now
case <-sm.ctx.Done():
break loop
}
}
}
func (sm *StatsManager) doTick(dur time.Duration) {
var params []rfc5424.SDParam
// flag indicating that there were some stats that were not zero
// we do this so that idle ingesters don't just keep barking empty stats
var ok bool
sm.Lock()
if len(sm.items) > 0 {
params = make([]rfc5424.SDParam, 0, len(sm.items)+1)
params = append(params, log.KV(statsIntervalName, dur.Milliseconds()))
//gather values
for _, v := range sm.items {
val := v.reset()
if val != 0 {
ok = true
}
params = append(params, log.KV(v.name, val))
}
}
sm.Unlock()
//emit entry
if len(params) > 0 && ok == true {
sm.lgr.Info(statsMsg, params...)
}
}
func (si *StatsItem) Add(v uint64) {
if si != nil {
atomic.AddUint64(&si.curr, v)
}
}
func (si *StatsItem) reset() (curr uint64) {
if si != nil {
//reset and
si.last = atomic.SwapUint64(&si.curr, 0)
curr = si.last // this could theoretically race, but reset should be controlled by a ticker, so not a huge worry
}
return
}