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tps_counter.go
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/
tps_counter.go
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// Copyright 2022 Qom Foundation
// This file is part of the Qom Network packages.
//
// Qom is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Qom packages are distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Qom packages. If not, see https://github.com/evmos/evmos/blob/main/LICENSE
package app
import (
"context"
"sync"
"sync/atomic"
"time"
"github.com/tendermint/tendermint/libs/log"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
)
var (
tagKeyStatus = tag.MustNewKey("status")
mTransactions = stats.Int64("transactions", "the number of transactions after .EndBlocker", "1")
viewTransactions = &view.View{
Name: "transactions_processed",
Measure: mTransactions,
Description: "The transactions processed",
TagKeys: []tag.Key{tagKeyStatus},
Aggregation: view.Count(),
}
)
func ObservabilityViews() (views []*view.View) {
views = append(views, viewTransactions)
return views
}
type tpsCounter struct {
nSuccessful, NFailed uint64
reportPeriod time.Duration
logger log.Logger
doneCloseOnce sync.Once
doneCh chan bool
}
func newTPSCounter(logger log.Logger) *tpsCounter {
return &tpsCounter{logger: logger, doneCh: make(chan bool, 1)}
}
func (tpc *tpsCounter) incrementSuccess() { atomic.AddUint64(&tpc.nSuccessful, 1) }
func (tpc *tpsCounter) incrementFailure() { atomic.AddUint64(&tpc.NFailed, 1) }
const defaultTPSReportPeriod = 10 * time.Second
func (tpc *tpsCounter) start(ctx context.Context) error {
tpsReportPeriod := defaultTPSReportPeriod
if tpc.reportPeriod > 0 {
tpsReportPeriod = tpc.reportPeriod
}
ticker := time.NewTicker(tpsReportPeriod)
defer ticker.Stop()
defer tpc.doneCloseOnce.Do(func() {
close(tpc.doneCh)
})
var lastNSuccessful, lastNFailed uint64
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-ticker.C:
// Report the number of transactions seen in the designated period of time.
latestNSuccessful := atomic.LoadUint64(&tpc.nSuccessful)
latestNFailed := atomic.LoadUint64(&tpc.NFailed)
var nTxn int64
nSuccess, err := tpc.recordValue(ctx, latestNSuccessful, lastNSuccessful, statusSuccess)
if err == nil {
nTxn += nSuccess
} else {
panic(err)
}
nFailed, err := tpc.recordValue(ctx, latestNFailed, lastNFailed, statusFailure)
if err == nil {
nTxn += nFailed
} else {
panic(err)
}
if nTxn != 0 {
// Record to our logger for easy examination in the logs.
secs := float64(tpsReportPeriod) / float64(time.Second)
tpc.logger.Info("Transactions per second", "tps", float64(nTxn)/secs)
}
lastNFailed = latestNFailed
lastNSuccessful = latestNSuccessful
}
}
}
type status string
const (
statusSuccess = "success"
statusFailure = "failure"
)
func (tpc *tpsCounter) recordValue(ctx context.Context, latest, previous uint64, status status) (int64, error) {
if latest < previous {
return 0, nil
}
n := int64(latest - previous)
if n < 0 {
// Perhaps we exceeded the uint64 limits then wrapped around, for the latest value.
// TODO: Perhaps log this?
return 0, nil
}
statusValue := "OK"
if status == statusFailure {
statusValue = "ERR"
}
ctx, err := tag.New(ctx, tag.Upsert(tagKeyStatus, statusValue))
if err != nil {
return 0, err
}
stats.Record(ctx, mTransactions.M(n))
return n, nil
}