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|
package toxics
import (
"time"
"github.com/Shopify/toxiproxy/stream"
)
// The BandwidthToxic passes data through at a limited rate
type BandwidthToxic struct {
// Rate in KB/s
Rate int64 `json:"rate"`
}
func (t *BandwidthToxic) Pipe(stub *ToxicStub) {
var sleep time.Duration = 0
for {
select {
case <-stub.Interrupt:
return
case p := <-stub.Input:
if p == nil {
stub.Close()
return
}
if t.Rate <= 0 {
sleep = 0
} else {
sleep += time.Duration(len(p.Data)) * time.Millisecond / time.Duration(t.Rate)
}
// If the rate is low enough, split the packet up and send in 100 millisecond intervals
for int64(len(p.Data)) > t.Rate*100 {
select {
case <-time.After(100 * time.Millisecond):
stub.Output <- &stream.StreamChunk{p.Data[:t.Rate*100], p.Timestamp}
p.Data = p.Data[t.Rate*100:]
sleep -= 100 * time.Millisecond
case <-stub.Interrupt:
stub.Output <- p // Don't drop any data on the floor
return
}
}
start := time.Now()
select {
case <-time.After(sleep):
// time.After only seems to have ~1ms prevision, so offset the next sleep by the error
sleep -= time.Since(start)
stub.Output <- p
case <-stub.Interrupt:
stub.Output <- p // Don't drop any data on the floor
return
}
}
}
}
func init() {
Register("bandwidth", new(BandwidthToxic))
}
|
