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Do not merge CNAME targets into one endpoint per RFC-1034

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This commit is contained in:
Diana Tuck 2024-11-07 11:21:42 -08:00
parent ea6d44b0d8
commit 7e10c80323
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GPG Key ID: 50A1EEDB43CA364F
2 changed files with 29 additions and 4 deletions
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1
source/service.go
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@ -223,6 +223,7 @@ func (sc *serviceSource) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, e
lastMergedEndpoint := len(mergedEndpoints) - 1
if mergedEndpoints[lastMergedEndpoint].DNSName == endpoints[i].DNSName &&
mergedEndpoints[lastMergedEndpoint].RecordType == endpoints[i].RecordType &&
mergedEndpoints[lastMergedEndpoint].RecordType != endpoint.RecordTypeCNAME && // It is against RFC-1034 for CNAME records to have multiple targets, so skip merging
mergedEndpoints[lastMergedEndpoint].SetIdentifier == endpoints[i].SetIdentifier &&
mergedEndpoints[lastMergedEndpoint].RecordTTL == endpoints[i].RecordTTL {
mergedEndpoints[lastMergedEndpoint].Targets = append(mergedEndpoints[lastMergedEndpoint].Targets, endpoints[i].Targets[0])

32
source/service_test.go
View File

@ -1260,13 +1260,37 @@ func testMultipleServicesEndpoints(t *testing.T) {
map[string]string{},
"",
map[string]map[string]string{
"a.elb.com": {hostnameAnnotationKey: "foo.example.org", SetIdentifierKey: "a"},
"b.elb.com": {hostnameAnnotationKey: "foo.example.org", SetIdentifierKey: "b"},
"1.2.3.5": {hostnameAnnotationKey: "foo.example.org", SetIdentifierKey: "a"},
"10.1.1.3": {hostnameAnnotationKey: "foo.example.org", SetIdentifierKey: "b"},
},
[]string{},
[]*endpoint.Endpoint{
{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"a.elb.com"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/fooa.elb.com"}, SetIdentifier: "a"},
{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"b.elb.com"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foob.elb.com"}, SetIdentifier: "b"},
{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.5"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foo1.2.3.5"}, SetIdentifier: "a"},
{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.1.3"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foo10.1.1.3"}, SetIdentifier: "b"},
},
false,
},
{
"test that services with CNAME types do not get merged together",
"",
"",
"testing",
"foo",
v1.ServiceTypeLoadBalancer,
"",
"",
false,
false,
map[string]string{},
"",
map[string]map[string]string{
"a.elb.com": {hostnameAnnotationKey: "foo.example.org"},
"b.elb.com": {hostnameAnnotationKey: "foo.example.org"},
},
[]string{},
[]*endpoint.Endpoint{
{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"a.elb.com"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/fooa.elb.com"}},
{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"b.elb.com"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foob.elb.com"}},
},
false,
},