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step_rendezvous.go
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step_rendezvous.go
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package hrp
import (
"sync"
"sync/atomic"
"time"
"github.com/rs/zerolog/log"
)
// StepRendezvous implements IStep interface.
type StepRendezvous struct {
step *TStep
}
func (s *StepRendezvous) Name() string {
if s.step.Name != "" {
return s.step.Name
}
return s.step.Rendezvous.Name
}
func (s *StepRendezvous) Type() StepType {
return stepTypeRendezvous
}
func (s *StepRendezvous) Struct() *TStep {
return s.step
}
func (s *StepRendezvous) Run(r *SessionRunner) (*StepResult, error) {
rendezvous := s.step.Rendezvous
log.Info().
Str("name", rendezvous.Name).
Float32("percent", rendezvous.Percent).
Int64("number", rendezvous.Number).
Int64("timeout", rendezvous.Timeout).
Msg("rendezvous")
stepResult := &StepResult{
Name: rendezvous.Name,
StepType: stepTypeRendezvous,
Success: true,
}
// pass current rendezvous if already released, activate rendezvous sequentially after spawn done
if rendezvous.isReleased() || !isPreRendezvousAllReleased(rendezvous, r.caseRunner.testCase.ToTCase()) || !rendezvous.isSpawnDone() {
return stepResult, nil
}
// activate the rendezvous only once during each cycle
rendezvous.once.Do(func() {
close(rendezvous.activateChan)
})
// check current cnt using double check lock before updating to avoid negative WaitGroup counter
if atomic.LoadInt64(&rendezvous.cnt) < rendezvous.Number {
rendezvous.lock.Lock()
if atomic.LoadInt64(&rendezvous.cnt) < rendezvous.Number {
atomic.AddInt64(&rendezvous.cnt, 1)
rendezvous.wg.Done()
rendezvous.timerResetChan <- struct{}{}
}
rendezvous.lock.Unlock()
}
// block until current rendezvous released
<-rendezvous.releaseChan
return stepResult, nil
}
func isPreRendezvousAllReleased(rendezvous *Rendezvous, testCase *TCase) bool {
for _, step := range testCase.TestSteps {
preRendezvous := step.Rendezvous
if preRendezvous == nil {
continue
}
// meet current rendezvous, all previous rendezvous released, return true
if preRendezvous == rendezvous {
return true
}
if !preRendezvous.isReleased() {
return false
}
}
return true
}
// WithUserNumber sets the user number needed to release the current rendezvous
func (s *StepRendezvous) WithUserNumber(number int64) *StepRendezvous {
s.step.Rendezvous.Number = number
return s
}
// WithUserPercent sets the user percent needed to release the current rendezvous
func (s *StepRendezvous) WithUserPercent(percent float32) *StepRendezvous {
s.step.Rendezvous.Percent = percent
return s
}
// WithTimeout sets the timeout of duration between each user arriving at the current rendezvous
func (s *StepRendezvous) WithTimeout(timeout int64) *StepRendezvous {
s.step.Rendezvous.Timeout = timeout
return s
}
const (
defaultRendezvousTimeout int64 = 5000
defaultRendezvousPercent float32 = 1.0
)
type Rendezvous struct {
Name string `json:"name" yaml:"name"` // required
Percent float32 `json:"percent,omitempty" yaml:"percent,omitempty"` // default to 1(100%)
Number int64 `json:"number,omitempty" yaml:"number,omitempty"`
Timeout int64 `json:"timeout,omitempty" yaml:"timeout,omitempty"` // milliseconds
cnt int64
releasedFlag uint32
spawnDoneFlag uint32
wg sync.WaitGroup
timerResetChan chan struct{}
activateChan chan struct{}
releaseChan chan struct{}
once *sync.Once
lock sync.Mutex
}
func (r *Rendezvous) reset() {
r.cnt = 0
r.releasedFlag = 0
r.wg.Add(int(r.Number))
// timerResetChan channel will not be closed, thus init only once
if r.timerResetChan == nil {
r.timerResetChan = make(chan struct{})
}
r.activateChan = make(chan struct{})
r.releaseChan = make(chan struct{})
r.once = new(sync.Once)
}
func (r *Rendezvous) isSpawnDone() bool {
return atomic.LoadUint32(&r.spawnDoneFlag) == 1
}
func (r *Rendezvous) setSpawnDone() {
atomic.StoreUint32(&r.spawnDoneFlag, 1)
}
func (r *Rendezvous) isReleased() bool {
return atomic.LoadUint32(&r.releasedFlag) == 1
}
func (r *Rendezvous) setReleased() {
atomic.StoreUint32(&r.releasedFlag, 1)
}
func initRendezvous(testcase *TestCase, total int64) []*Rendezvous {
var rendezvousList []*Rendezvous
for _, s := range testcase.TestSteps {
step := s.Struct()
if step.Rendezvous == nil {
continue
}
rendezvous := step.Rendezvous
// either number or percent should be correctly put, otherwise set to default (total)
if rendezvous.Number == 0 && rendezvous.Percent > 0 && rendezvous.Percent <= defaultRendezvousPercent {
rendezvous.Number = int64(rendezvous.Percent * float32(total))
} else if rendezvous.Number > 0 && rendezvous.Number <= total && rendezvous.Percent == 0 {
rendezvous.Percent = float32(rendezvous.Number) / float32(total)
} else {
log.Warn().
Str("name", rendezvous.Name).
Int64("default number", total).
Float32("default percent", defaultRendezvousPercent).
Msg("rendezvous parameter not defined or error, set to default value")
rendezvous.Number = total
rendezvous.Percent = defaultRendezvousPercent
}
if rendezvous.Timeout <= 0 {
rendezvous.Timeout = defaultRendezvousTimeout
}
rendezvous.reset()
rendezvousList = append(rendezvousList, rendezvous)
}
return rendezvousList
}
func (r *Rendezvous) updateRendezvousNumber(number int64) {
atomic.StoreInt64(&r.Number, int64(float32(number)*r.Percent))
}
func waitRendezvous(rendezvousList []*Rendezvous, b *HRPBoomer) {
if rendezvousList != nil {
lastRendezvous := rendezvousList[len(rendezvousList)-1]
for _, rendezvous := range rendezvousList {
go waitSingleRendezvous(rendezvous, rendezvousList, lastRendezvous, b)
}
}
}
func waitSingleRendezvous(rendezvous *Rendezvous, rendezvousList []*Rendezvous, lastRendezvous *Rendezvous, b *HRPBoomer) {
for {
// cycle start: block current checking until current rendezvous activated
<-rendezvous.activateChan
stop := make(chan struct{})
timeout := time.Duration(rendezvous.Timeout) * time.Millisecond
timer := time.NewTimer(timeout)
go func() {
defer close(stop)
rendezvous.wg.Wait()
}()
for !rendezvous.isReleased() {
select {
case <-rendezvous.timerResetChan:
timer.Reset(timeout)
case <-stop:
rendezvous.setReleased()
close(rendezvous.releaseChan)
log.Info().
Str("name", rendezvous.Name).
Float32("percent", rendezvous.Percent).
Int64("number", rendezvous.Number).
Int64("timeout(ms)", rendezvous.Timeout).
Int64("cnt", rendezvous.cnt).
Str("reason", "rendezvous release condition satisfied").
Msg("rendezvous released")
case <-timer.C:
rendezvous.setReleased()
close(rendezvous.releaseChan)
log.Info().
Str("name", rendezvous.Name).
Float32("percent", rendezvous.Percent).
Int64("number", rendezvous.Number).
Int64("timeout(ms)", rendezvous.Timeout).
Int64("cnt", rendezvous.cnt).
Str("reason", "time's up").
Msg("rendezvous released")
}
}
// cycle end: reset all previous rendezvous after last rendezvous released
// otherwise, block current checker until the last rendezvous end
if rendezvous == lastRendezvous {
for _, r := range rendezvousList {
r.reset()
// dynamic adjustment based on the number of concurrent users
r.updateRendezvousNumber(int64(b.GetSpawnCount()))
}
} else {
<-lastRendezvous.releaseChan
}
}
}