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fix(nsc): remove error for lookupFWMarkByService

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lookupFWMarkByService() was previous returning an error when no fwmark
was found in the tracking map for a given service. However, this isn't
really an error condition and shouldn't be treated as such. When it was
treated as an error condition users got a lot of confusing errors in the
logs.
This commit is contained in:
Aaron U'Ren 2021-12-02 09:47:58 -06:00 committed by Manuel Rüger
parent bf325e1621
commit 5101a4fe81
3 changed files with 6 additions and 12 deletions
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4
pkg/controllers/proxy/service_endpoints_sync.go
View File

@ -367,10 +367,8 @@ func (nsc *NetworkServicesController) setupExternalIPServices(serviceInfoMap ser
externalIPServiceID = generateIPPortID(externalIP, svc.protocol, strconv.Itoa(svc.port))
// ensure there is NO iptables mangle table rule to FW mark the packet
fwMark, err := nsc.lookupFWMarkByService(externalIP, svc.protocol, strconv.Itoa(svc.port))
fwMark := nsc.lookupFWMarkByService(externalIP, svc.protocol, strconv.Itoa(svc.port))
switch {
case err != nil:
klog.Errorf("failed to find FW mark for the service: %v", err)
case fwMark == 0:
klog.V(2).Infof("no FW mark found for service, nothing to cleanup")
case fwMark != 0:

6
pkg/controllers/proxy/utils.go
View File

@ -211,14 +211,14 @@ func (nsc *NetworkServicesController) generateUniqueFWMark(ip, protocol, port st
// lookupFWMarkByService finds the related FW mark from the internal fwMarkMap kept by the NetworkServiceController
// given the related ip, protocol, and port. If it isn't able to find a matching FW mark, then it returns an error.
func (nsc *NetworkServicesController) lookupFWMarkByService(ip, protocol, port string) (uint32, error) {
func (nsc *NetworkServicesController) lookupFWMarkByService(ip, protocol, port string) uint32 {
needle := fmt.Sprintf("%s-%s-%s", ip, protocol, port)
for fwMark, serviceKey := range nsc.fwMarkMap {
if needle == serviceKey {
return fwMark, nil
return fwMark
}
}
return 0, fmt.Errorf("no key matching %s:%s:%s was found in fwMarkMap", protocol, ip, port)
return 0
}
// lookupServiceByFWMark Lookup service ip, protocol, port by given FW Mark value (reverse of lookupFWMarkByService)

8
pkg/controllers/proxy/utils_test.go
View File

@ -87,21 +87,17 @@ func TestNetworkServicesController_lookupFWMarkByService(t *testing.T) {
t.Run("ensure existing FW mark is found in lookup", func(t *testing.T) {
nsc := getMoqNSC()
fwMark1, err1 := nsc.generateUniqueFWMark("10.255.0.1", "TCP", "80")
fwMark2, err2 := nsc.lookupFWMarkByService("10.255.0.1", "TCP", "80")
fwMark2 := nsc.lookupFWMarkByService("10.255.0.1", "TCP", "80")
assert.NoError(t, err1, "there shouldn't have been an error calling generateUniqueFWMark")
assert.NoError(t, err2, "there shouldn't have been an error calling lookupFWMarkByService")
assert.Equal(t, fwMark1, fwMark2,
"given the same inputs, lookupFWMarkByService should be able to find the previously generated FW mark")
})
t.Run("ensure error is returned when a service doesn't exist in FW mark map", func(t *testing.T) {
nsc := getMoqNSC()
fwMark, err := nsc.lookupFWMarkByService("10.255.0.1", "TCP", "80")
fwMark := nsc.lookupFWMarkByService("10.255.0.1", "TCP", "80")
assert.EqualErrorf(t, err,
fmt.Sprintf("no key matching %s:%s:%s was found in fwMarkMap", "TCP", "10.255.0.1", "80"),
"expected to get an error when service had not yet been added to fwMarkMap")
assert.Equal(t, uint32(0), fwMark, "expected FW mark to be 0 on error condition")
})
}