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Ability to kill the Serve method #2760

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Ability to kill the Serve method #2760

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24 changes: 22 additions & 2 deletions pkg/server/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -381,8 +381,12 @@ func (s *BgpServer) passConnToPeer(conn *net.TCPConn) {

const firstPeerCaseIndex = 3

func (s *BgpServer) Serve() {
func (s *BgpServer) Serve(optionalCh ...<-chan struct{}) {
s.listeners = make([]*tcpListener, 0, 2)
var stopCh <-chan struct{}
if len(optionalCh) > 0 {
stopCh = optionalCh[0]
}

handlefsmMsg := func(e *fsmMsg) {
fsm := e.fsm
Expand Down Expand Up @@ -456,7 +460,12 @@ func (s *BgpServer) Serve() {
}

for {
cases := make([]reflect.SelectCase, firstPeerCaseIndex+len(s.incomings))
casesSize := firstPeerCaseIndex + len(s.incomings)
if stopCh != nil {
casesSize++
}
cases := make([]reflect.SelectCase, casesSize)

cases[0] = reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(s.mgmtCh),
Expand All @@ -475,6 +484,12 @@ func (s *BgpServer) Serve() {
Chan: reflect.ValueOf(s.incomings[i-firstPeerCaseIndex].Out()),
}
}
if stopCh != nil {
cases[len(cases)-1] = reflect.SelectCase{
Dir: reflect.SelectRecv,
Chan: reflect.ValueOf(stopCh),
}
}

chosen, value, ok := reflect.Select(cases)
switch chosen {
Expand All @@ -487,7 +502,12 @@ func (s *BgpServer) Serve() {
case 2:
ev := value.Interface().(*roaEvent)
s.roaManager.HandleROAEvent(ev)
case len(cases) - 1:
return
default:
if stopCh != nil && chosen == len(cases)-1 {
return
}
// in the case of dynamic peer, handleFSMMessage closed incoming channel so
// nil fsmMsg can happen here.
if ok {
Expand Down