Cloak/internal/multiplex/qos.go

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package multiplex
import (
"sync/atomic"
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"github.com/juju/ratelimit"
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)
// Valve needs to be universal, across all sessions that belong to a user
type LimitedValve struct {
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// traffic directions from the server's perspective are refered
// exclusively as rx and tx.
// rx is from client to server, tx is from server to client
// DO NOT use terms up or down as this is used in usermanager
// for bandwidth limiting
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rxtb *ratelimit.Bucket
txtb *ratelimit.Bucket
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rx *int64
tx *int64
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}
type UnlimitedValve struct{}
func MakeValve(rxRate, txRate int64) *LimitedValve {
var rx, tx int64
v := &LimitedValve{
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rxtb: ratelimit.NewBucketWithRate(float64(rxRate), rxRate),
txtb: ratelimit.NewBucketWithRate(float64(txRate), txRate),
rx: &rx,
tx: &tx,
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}
return v
}
var UNLIMITED_VALVE = &UnlimitedValve{}
func (v *LimitedValve) rxWait(n int) { v.rxtb.Wait(int64(n)) }
func (v *LimitedValve) txWait(n int) { v.txtb.Wait(int64(n)) }
func (v *LimitedValve) AddRx(n int64) { atomic.AddInt64(v.rx, n) }
func (v *LimitedValve) AddTx(n int64) { atomic.AddInt64(v.tx, n) }
func (v *LimitedValve) GetRx() int64 { return atomic.LoadInt64(v.rx) }
func (v *LimitedValve) GetTx() int64 { return atomic.LoadInt64(v.tx) }
func (v *LimitedValve) Nullify() (int64, int64) {
rx := atomic.SwapInt64(v.rx, 0)
tx := atomic.SwapInt64(v.tx, 0)
return rx, tx
}
func (v *UnlimitedValve) rxWait(n int) {}
func (v *UnlimitedValve) txWait(n int) {}
func (v *UnlimitedValve) AddRx(n int64) {}
func (v *UnlimitedValve) AddTx(n int64) {}
func (v *UnlimitedValve) GetRx() int64 { return 0 }
func (v *UnlimitedValve) GetTx() int64 { return 0 }
func (v *UnlimitedValve) Nullify() (int64, int64) { return 0, 0 }
type Valve interface {
rxWait(n int)
txWait(n int)
AddRx(n int64)
AddTx(n int64)
GetRx() int64
GetTx() int64
Nullify() (int64, int64)
}