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lib/connections: Rate limit quic accept loop (fixes #6081) (#6082)

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Audrius Butkevicius 2019-10-18 09:55:37 +02:00 committed by Jakob Borg
parent ad2d3702ae
commit c4f161d8c5
1 changed files with 19 additions and 1 deletions
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20
lib/connections/quic_listen.go
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@ -16,6 +16,7 @@ import (
"strings" "strings"
"sync" "sync"
"sync/atomic" "sync/atomic"
"time"
"github.com/lucas-clemente/quic-go" "github.com/lucas-clemente/quic-go"
@ -110,6 +111,9 @@ func (t *quicListener) serve(stop chan struct{}) error {
l.Infof("QUIC listener (%v) starting", packetConn.LocalAddr()) l.Infof("QUIC listener (%v) starting", packetConn.LocalAddr())
defer l.Infof("QUIC listener (%v) shutting down", packetConn.LocalAddr()) defer l.Infof("QUIC listener (%v) shutting down", packetConn.LocalAddr())
acceptFailures := 0
const maxAcceptFailures = 10
for { for {
select { select {
case <-ctx.Done(): case <-ctx.Done():
@ -121,9 +125,23 @@ func (t *quicListener) serve(stop chan struct{}) error {
if err == context.Canceled { if err == context.Canceled {
return nil return nil
} else if err != nil { } else if err != nil {
l.Warnln("Listen (BEP/quic): Accepting connection:", err) l.Infoln("Listen (BEP/quic): Accepting connection:", err)
acceptFailures++
if acceptFailures > maxAcceptFailures {
// Return to restart the listener, because something
// seems permanently damaged.
return err
}
// Slightly increased delay for each failure.
time.Sleep(time.Duration(acceptFailures) * time.Second)
continue continue
} }
acceptFailures = 0
l.Debugln("connect from", session.RemoteAddr()) l.Debugln("connect from", session.RemoteAddr())
streamCtx, cancel := context.WithTimeout(ctx, quicOperationTimeout) streamCtx, cancel := context.WithTimeout(ctx, quicOperationTimeout)