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Don't call cmp in non testing file #5370

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merged 2 commits into from May 23, 2022
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Don't call cmp in non testing file #5370

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5dbb89d
Don't call cmp in non testing file
zasweq May 19, 2022
6fe1452
Responded to Doug's comments
zasweq May 23, 2022
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2 changes: 1 addition & 1 deletion xds/internal/balancer/clusterresolver/config.go
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Expand Up @@ -121,7 +121,7 @@ func (dm DiscoveryMechanism) Equal(b DiscoveryMechanism) bool {
return false
case dm.DNSHostname != b.DNSHostname:
return false
case !dm.OutlierDetection.Equal(b.OutlierDetection):
case !dm.OutlierDetection.EqualODOnly(b.OutlierDetection):
return false
}

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12 changes: 5 additions & 7 deletions xds/internal/balancer/outlierdetection/config.go
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Expand Up @@ -22,7 +22,6 @@ package outlierdetection
import (
"time"

"github.com/google/go-cmp/cmp"
internalserviceconfig "google.golang.org/grpc/internal/serviceconfig"
"google.golang.org/grpc/serviceconfig"
)
Expand Down Expand Up @@ -154,8 +153,10 @@ type LBConfig struct {
ChildPolicy *internalserviceconfig.BalancerConfig `json:"childPolicy,omitempty"`
}

// Equal returns whether the LBConfig is the same with the parameter.
func (lbc *LBConfig) Equal(lbc2 *LBConfig) bool {
// EqualODOnly returns whether the LBConfig is same with the parameter outside
// of the child policy, only comparing the Outlier Detection specific
// configuration.
func (lbc *LBConfig) EqualODOnly(lbc2 *LBConfig) bool {
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Nit:

EqualIgnoringChildPolicy?

"ODOnly" seems less informative to me since we're comparing OD LB policy structs in the OD package.

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Switched.

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Also, we should probably have a test of this function that will fail if we add new fields to the config struct.

Even a purely change-detector test would help; something like:

func TestEqualFields(t *testing.T) {
	fields := map[string]bool{"LoadBalancingConfig": true, "Interval": true, "BaseEjectionTime": true, ....}
	t := reflect.TypeOf((*LBConfig)(nil))
	for i := 0; i < t.NumField(); i++ { // that's probably not the right method name
		if n := t.Field(i).Name; !fields[n] {
			t.Error("New field %q; update this test and EqualIgnoringChildPolicy", n)
		}
	}
}

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Added this change-detector test for every node in the config tree.

if lbc == nil && lbc2 == nil {
return true
}
Expand All @@ -177,8 +178,5 @@ func (lbc *LBConfig) Equal(lbc2 *LBConfig) bool {
if !lbc.SuccessRateEjection.Equal(lbc2.SuccessRateEjection) {
return false
}
if !lbc.FailurePercentageEjection.Equal(lbc2.FailurePercentageEjection) {
return false
}
return cmp.Equal(lbc.ChildPolicy, lbc2.ChildPolicy)
return lbc.FailurePercentageEjection.Equal(lbc2.FailurePercentageEjection)
}