/
throttle.go
77 lines (66 loc) · 1.29 KB
/
throttle.go
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package ratelimiter
import (
"context"
"time"
"github.com/insolar/vanilla/atomickit"
"github.com/insolar/vanilla/throw"
)
func NewController(trafficUnit uint32, refillPeriod time.Duration) *Controller {
switch {
case trafficUnit == 0:
panic(throw.IllegalValue())
case refillPeriod <= 0:
panic(throw.IllegalValue())
}
c := &Controller{}
c.root.amountScale = trafficUnit
c.period = refillPeriod
c.root.init()
return c
}
type Controller struct {
root PeriodManager
period time.Duration
throttle atomickit.Uint32
started bool
}
func (p *Controller) Init() {
if p.started {
panic(throw.IllegalState())
}
p.root.init()
}
func (p *Controller) SetIncrement(level uint32) {
p.throttle.Store(level)
}
func (p *Controller) GetIncrement() uint32 {
return p.throttle.Load()
}
func (p *Controller) Start(ctx context.Context) {
if p.started {
panic(throw.IllegalState())
}
if ctx == nil {
panic(throw.IllegalValue())
}
p.started = true
go p.run(ctx)
}
func (p *Controller) Root() *PeriodManager {
return &p.root
}
func (p *Controller) run(ctx context.Context) {
ticker := time.NewTicker(p.period)
defer ticker.Stop()
for {
select {
case <-ticker.C:
step := p.throttle.Load()
if step > 0 {
p.root.nextPeriod(uint(step))
}
case <-ctx.Done():
return
}
}
}