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retransmitter.go
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retransmitter.go
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package xgress
import (
"github.com/michaelquigley/pfxlog"
"github.com/openziti/metrics"
"sync/atomic"
)
var retransmitter *Retransmitter
func InitRetransmitter(forwarder PayloadBufferForwarder, faultReporter RetransmitterFaultReporter, metrics metrics.Registry, closeNotify <-chan struct{}) {
retransmitter = NewRetransmitter(forwarder, faultReporter, metrics, closeNotify)
}
type RetransmitterFaultReporter interface {
ReportForwardingFault(circuitId string, ctrlId string)
}
type Retransmitter struct {
forwarder PayloadBufferForwarder
faultReporter RetransmitterFaultReporter
retxTail *txPayload
retxHead *txPayload
retransmitIngest chan *txPayload
retransmitSend chan *txPayload
retransmitsQueueSize int64
closeNotify <-chan struct{}
}
func NewRetransmitter(forwarder PayloadBufferForwarder, faultReporter RetransmitterFaultReporter, metrics metrics.Registry, closeNotify <-chan struct{}) *Retransmitter {
ctrl := &Retransmitter{
forwarder: forwarder,
retransmitIngest: make(chan *txPayload, 16),
retransmitSend: make(chan *txPayload, 1),
closeNotify: closeNotify,
faultReporter: faultReporter,
}
go ctrl.retransmitIngester()
go ctrl.retransmitSender()
metrics.FuncGauge("xgress.retransmits.queue_size", func() int64 {
return atomic.LoadInt64(&ctrl.retransmitsQueueSize)
})
return ctrl
}
func (retransmitter *Retransmitter) queue(p *txPayload) {
retransmitter.retransmitIngest <- p
}
func (retransmitter *Retransmitter) popHead() *txPayload {
if retransmitter.retxHead == nil {
return nil
}
result := retransmitter.retxHead
if result.prev == nil {
retransmitter.retxHead = nil
retransmitter.retxTail = nil
} else {
retransmitter.retxHead = result.prev
result.prev.next = nil
}
result.prev = nil
result.next = nil
atomic.AddInt64(&retransmitter.retransmitsQueueSize, -1)
return result
}
func (retransmitter *Retransmitter) pushTail(txp *txPayload) {
if txp.prev != nil || txp.next != nil || txp == retransmitter.retxHead {
return
}
if retransmitter.retxHead == nil {
retransmitter.retxTail = txp
retransmitter.retxHead = txp
} else {
txp.next = retransmitter.retxTail
retransmitter.retxTail.prev = txp
retransmitter.retxTail = txp
}
atomic.AddInt64(&retransmitter.retransmitsQueueSize, 1)
}
func (retransmitter *Retransmitter) delete(txp *txPayload) {
if retransmitter.retxHead == txp {
retransmitter.popHead()
} else if txp == retransmitter.retxTail {
retransmitter.retxTail = txp.next
retransmitter.retxTail.prev = nil
atomic.AddInt64(&retransmitter.retransmitsQueueSize, -1)
} else if txp.prev != nil {
txp.prev.next = txp.next
txp.next.prev = txp.prev
atomic.AddInt64(&retransmitter.retransmitsQueueSize, -1)
}
txp.prev = nil
txp.next = nil
}
func (retransmitter *Retransmitter) retransmitIngester() {
var next *txPayload
for {
if next == nil {
next = retransmitter.popHead()
}
if next == nil {
select {
case retransmit := <-retransmitter.retransmitIngest:
retransmitter.acceptRetransmit(retransmit)
case <-retransmitter.closeNotify:
return
}
} else {
select {
case retransmit := <-retransmitter.retransmitIngest:
retransmitter.acceptRetransmit(retransmit)
case retransmitter.retransmitSend <- next:
next = nil
case <-retransmitter.closeNotify:
return
}
}
}
}
func (retransmitter *Retransmitter) acceptRetransmit(txp *txPayload) {
if txp.isAcked() {
retransmitter.delete(txp)
} else {
retransmitter.pushTail(txp)
}
}
func (retransmitter *Retransmitter) retransmitSender() {
logger := pfxlog.Logger()
for {
select {
case retransmit := <-retransmitter.retransmitSend:
if !retransmit.isAcked() {
if err := retransmitter.forwarder.RetransmitPayload(retransmit.x.address, retransmit.payload); err != nil {
// if xgress is closed, don't log the error. We still want to try retransmitting in case we're re-sending end of circuit
if !retransmit.x.Closed() {
logger.WithError(err).Errorf("unexpected error while retransmitting payload from [@/%v]", retransmit.x.address)
retransmissionFailures.Mark(1)
retransmitter.faultReporter.ReportForwardingFault(retransmit.payload.CircuitId, retransmit.x.ctrlId)
} else {
logger.WithError(err).Tracef("unexpected error while retransmitting payload from [@/%v] (already closed)", retransmit.x.address)
}
} else {
retransmit.markSent()
retransmissions.Mark(1)
}
retransmit.dequeued()
}
case <-retransmitter.closeNotify:
return
}
}
}