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Fix for specifying a health check port with an ExternalName Service #6230

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merged 3 commits into from
Mar 4, 2024
Merged

Fix for specifying a health check port with an ExternalName Service #6230

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205246b
fix #6229
yangyy93 Feb 29, 2024
9d7c205
add some ut and changelog
yangyy93 Mar 1, 2024
51da8fb
fix golangci-lint
yangyy93 Mar 4, 2024
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47 changes: 47 additions & 0 deletions internal/envoy/v3/cluster_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,29 @@ func TestCluster(t *testing.T) {
},
}

s3 := &core_v1.Service{
ObjectMeta: meta_v1.ObjectMeta{
Name: "kuard",
Namespace: "default",
},
Spec: core_v1.ServiceSpec{
ExternalName: "foo.io",
Ports: []core_v1.ServicePort{
{
Name: "http",
Protocol: "TCP",
Port: 443,
TargetPort: intstr.FromInt(8080),
}, {
Name: "health-check",
Protocol: "TCP",
Port: 8998,
TargetPort: intstr.FromInt(8998),
},
},
},
}

svcExternal := &core_v1.Service{
ObjectMeta: meta_v1.ObjectMeta{
Name: "kuard",
Expand Down Expand Up @@ -196,6 +219,17 @@ func TestCluster(t *testing.T) {
LoadAssignment: ExternalNameClusterLoadAssignment(service(s2)),
},
},
"externalName service healthcheckport": {
cluster: &dag.Cluster{
Upstream: healthcheckService(s3),
},
want: &envoy_config_cluster_v3.Cluster{
Name: "default/kuard/443/da39a3ee5e",
AltStatName: "default_kuard_443",
ClusterDiscoveryType: ClusterDiscoveryType(envoy_config_cluster_v3.Cluster_STRICT_DNS),
LoadAssignment: ExternalNameClusterLoadAssignment(healthcheckService(s3)),
},
},
"externalName service - dns-lookup-family v4": {
cluster: &dag.Cluster{
Upstream: service(s2),
Expand Down Expand Up @@ -1192,3 +1226,16 @@ func service(s *core_v1.Service, protocols ...string) *dag.Service {
Protocol: protocol,
}
}

func healthcheckService(s *core_v1.Service) *dag.Service {
return &dag.Service{
Weighted: dag.WeightedService{
Weight: 1,
ServiceName: s.Name,
ServiceNamespace: s.Namespace,
ServicePort: s.Spec.Ports[0],
HealthPort: s.Spec.Ports[1],
},
ExternalName: s.Spec.ExternalName,
}
}
6 changes: 5 additions & 1 deletion internal/envoy/v3/endpoint.go
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Original file line number Diff line number Diff line change
Expand Up @@ -77,11 +77,15 @@ func ClusterLoadAssignment(name string, addrs ...*envoy_config_core_v3.Address)

// ExternalNameClusterLoadAssignment creates a *envoy_config_endpoint_v3.ClusterLoadAssignment pointing to service's ExternalName DNS address.
func ExternalNameClusterLoadAssignment(service *dag.Service) *envoy_config_endpoint_v3.ClusterLoadAssignment {
return ClusterLoadAssignment(
cla := ClusterLoadAssignment(
xds.ClusterLoadAssignmentName(
types.NamespacedName{Name: service.Weighted.ServiceName, Namespace: service.Weighted.ServiceNamespace},
service.Weighted.ServicePort.Name,
),
SocketAddress(service.ExternalName, int(service.Weighted.ServicePort.Port)),
)
if service.Weighted.ServicePort.Port != service.Weighted.HealthPort.Port {
cla.Endpoints[0].LbEndpoints[0].GetEndpoint().HealthCheckConfig = HealthCheckConfig(service.Weighted.HealthPort.Port)
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This looks OK to me but I had to stop for a bit when reading - we know we always assign exactly 1 address and therefore it is safe to access Endpoints[0].LbEndpoints[0], right?

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yeah we pass only one address to ClusterLoadAssignment above so the returned cla should have one endpoint entry, but lets add another test of just the ExternalNameClusterLoadAssignment function to endpoint_test.go to be sure

}
return cla
}
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