mirror of
https://github.com/coredns/coredns.git
synced 2025-10-30 17:53:21 -04:00
312 lines
9.1 KiB
Go
312 lines
9.1 KiB
Go
package traffic
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import (
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"context"
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"testing"
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"github.com/coredns/coredns/plugin/pkg/dnstest"
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"github.com/coredns/coredns/plugin/pkg/dnsutil"
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"github.com/coredns/coredns/plugin/test"
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"github.com/coredns/coredns/plugin/traffic/xds"
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corepb "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
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endpointpb "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
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"github.com/miekg/dns"
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"google.golang.org/grpc"
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)
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func TestTraffic(t *testing.T) {
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c, err := xds.New("127.0.0.1:0", "test-id", grpc.WithInsecure())
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if err != nil {
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t.Fatal(err)
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}
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tr := &Traffic{c: c, origins: []string{"lb.example.org."}}
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tests := []struct {
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cla *endpointpb.ClusterLoadAssignment
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cluster string
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qtype uint16
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rcode int
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answer string // address value of the A/AAAA record.
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ns bool // should there be a ns section.
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}{
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{
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cla: &endpointpb.ClusterLoadAssignment{},
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cluster: "web", qtype: dns.TypeA, rcode: dns.RcodeSuccess, ns: true,
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},
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{
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cla: &endpointpb.ClusterLoadAssignment{},
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cluster: "web", qtype: dns.TypeSRV, rcode: dns.RcodeSuccess, ns: true,
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},
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{
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cla: &endpointpb.ClusterLoadAssignment{},
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cluster: "does-not-exist", qtype: dns.TypeA, rcode: dns.RcodeNameError, ns: true,
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},
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// healthy endpoint
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{{"127.0.0.1", 18008, corepb.HealthStatus_HEALTHY}}),
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},
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cluster: "web", qtype: dns.TypeA, rcode: dns.RcodeSuccess, answer: "127.0.0.1",
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},
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{{"::1", 18008, corepb.HealthStatus_HEALTHY}}),
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},
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cluster: "web", qtype: dns.TypeAAAA, rcode: dns.RcodeSuccess, answer: "::1",
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},
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// unknown endpoint
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{{"127.0.0.1", 18008, corepb.HealthStatus_UNKNOWN}}),
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},
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cluster: "web", qtype: dns.TypeA, rcode: dns.RcodeSuccess, ns: true,
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},
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// unknown endpoint and healthy endpoint
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{
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{"127.0.0.1", 18008, corepb.HealthStatus_UNKNOWN},
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{"127.0.0.2", 18008, corepb.HealthStatus_HEALTHY},
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}),
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},
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cluster: "web", qtype: dns.TypeA, rcode: dns.RcodeSuccess, answer: "127.0.0.2",
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},
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// unknown endpoint and healthy endpoint, TXT query
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{
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{"127.0.0.1", 18008, corepb.HealthStatus_UNKNOWN},
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}),
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},
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cluster: "web", qtype: dns.TypeTXT, rcode: dns.RcodeSuccess, answer: "endpoint-0.web.lb.example.org.",
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},
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// SRV query healthy endpoint
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{
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{"127.0.0.2", 18008, corepb.HealthStatus_HEALTHY},
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}),
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},
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cluster: "web", qtype: dns.TypeSRV, rcode: dns.RcodeSuccess, answer: "endpoint-0.web.lb.example.org.",
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},
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// A query for endpoint-0.
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{
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{"127.0.0.2", 18008, corepb.HealthStatus_HEALTHY},
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}),
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},
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cluster: "endpoint-0.web", qtype: dns.TypeA, rcode: dns.RcodeSuccess, answer: "127.0.0.2",
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},
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// A query for endpoint-1.
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{
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{"127.0.0.2", 18008, corepb.HealthStatus_HEALTHY},
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{"127.0.0.3", 18008, corepb.HealthStatus_HEALTHY},
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}),
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},
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cluster: "endpoint-1.web", qtype: dns.TypeA, rcode: dns.RcodeSuccess, answer: "127.0.0.3",
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},
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// TXT query for _grpc_config
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{
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{"127.0.0.2", 18008, corepb.HealthStatus_HEALTHY},
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}),
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},
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cluster: "_grpc_config.web", qtype: dns.TypeTXT, rcode: dns.RcodeNameError, ns: true,
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},
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}
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ctx := context.TODO()
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for i, tc := range tests {
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a := xds.NewAssignment()
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a.SetClusterLoadAssignment("web", tc.cla) // web is our cluster
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c.SetAssignments(a)
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m := new(dns.Msg)
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cl := dnsutil.Join(tc.cluster, tr.origins[0])
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m.SetQuestion(cl, tc.qtype)
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rec := dnstest.NewRecorder(&test.ResponseWriter{})
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_, err := tr.ServeDNS(ctx, rec, m)
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if err != nil {
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t.Errorf("Test %d: Expected no error for %q, but got %q", i, cl, err)
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}
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if rec.Msg.Rcode != tc.rcode {
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t.Errorf("Test %d: Expected no rcode %d for %q, but got %d", i, tc.rcode, cl, rec.Msg.Rcode)
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}
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if tc.ns && len(rec.Msg.Ns) == 0 {
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t.Errorf("Test %d: Expected authority section for %q, but got none", i, cl)
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}
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if tc.answer != "" && len(rec.Msg.Answer) == 0 {
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t.Fatalf("Test %d: Expected answer section for %q, but got none", i, cl)
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}
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if tc.answer != "" {
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record := rec.Msg.Answer[0]
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addr := ""
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switch x := record.(type) {
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case *dns.A:
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addr = x.A.String()
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case *dns.AAAA:
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addr = x.AAAA.String()
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case *dns.SRV:
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addr = x.Target
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case *dns.TXT:
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addr = x.Txt[3]
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}
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if tc.answer != addr {
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t.Errorf("Test %d: Expected answer %q for %q, but got %s", i, tc.answer, cl, addr)
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}
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}
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}
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}
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func TestTrafficSRV(t *testing.T) {
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c, err := xds.New("127.0.0.1:0", "test-id", grpc.WithInsecure())
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if err != nil {
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t.Fatal(err)
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}
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tr := &Traffic{c: c, origins: []string{"lb.example.org."}}
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tests := []struct {
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cla *endpointpb.ClusterLoadAssignment
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cluster string
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qtype uint16
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rcode int
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answer int // number of records in answer section
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}{
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// SRV query healthy endpoint
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{
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cla: &endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{
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{"127.0.0.2", 18008, corepb.HealthStatus_HEALTHY},
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{"127.0.0.3", 18008, corepb.HealthStatus_HEALTHY},
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}),
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},
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cluster: "web", qtype: dns.TypeSRV, rcode: dns.RcodeSuccess, answer: 2,
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},
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}
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ctx := context.TODO()
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for i, tc := range tests {
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a := xds.NewAssignment()
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a.SetClusterLoadAssignment("web", tc.cla) // web is our cluster
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c.SetAssignments(a)
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m := new(dns.Msg)
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cl := dnsutil.Join(tc.cluster, tr.origins[0])
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m.SetQuestion(cl, tc.qtype)
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rec := dnstest.NewRecorder(&test.ResponseWriter{})
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_, err := tr.ServeDNS(ctx, rec, m)
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if err != nil {
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t.Errorf("Test %d: Expected no error, but got %q", i, err)
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}
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if rec.Msg.Rcode != tc.rcode {
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t.Errorf("Test %d: Expected no rcode %d, but got %d", i, tc.rcode, rec.Msg.Rcode)
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}
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if tc.answer != len(rec.Msg.Answer) {
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t.Fatalf("Test %d: Expected %d answers, but got %d", i, tc.answer, len(rec.Msg.Answer))
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}
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}
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}
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func TestTrafficManagement(t *testing.T) {
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c, err := xds.New("127.0.0.1:0", "test-id", grpc.WithInsecure())
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if err != nil {
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t.Fatal(err)
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}
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tr := &Traffic{c: c, origins: []string{"lb.example.org."}, mgmt: "xds"}
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for _, cla := range []*endpointpb.ClusterLoadAssignment{
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&endpointpb.ClusterLoadAssignment{
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ClusterName: "web",
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Endpoints: endpoints([]EndpointHealth{{"127.0.0.1", 18008, corepb.HealthStatus_HEALTHY}}),
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},
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&endpointpb.ClusterLoadAssignment{
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ClusterName: "xds",
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Endpoints: endpoints([]EndpointHealth{{"::1", 18008, corepb.HealthStatus_HEALTHY}}),
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},
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} {
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a := xds.NewAssignment()
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a.SetClusterLoadAssignment(cla.ClusterName, cla)
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c.SetAssignments(a)
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}
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ctx := context.TODO()
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// Now we ask for the grpclb endpoint in the web cluster, this should give us the endpoint of the xds (mgmt) cluster.
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// ; ANSWER SECTION:
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// _grpclb._tcp.web.lb.example.org. 5 IN SRV 100 100 18008 endpoint-0.xds.lb.example.org.
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// ;; ADDITIONAL SECTION:
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// endpoint-0.xds.lb.example.org. 5 IN AAAA ::1
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m := new(dns.Msg)
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m.SetQuestion("_grpclb._tcp.web.lb.example.org.", dns.TypeSRV)
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rec := dnstest.NewRecorder(&test.ResponseWriter{})
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if _, err := tr.ServeDNS(ctx, rec, m); err != nil {
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t.Errorf("Expected no error, but got %q", err)
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}
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if len(rec.Msg.Answer) == 0 {
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t.Fatalf("Expected answer section, got none")
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}
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if x := rec.Msg.Answer[0].(*dns.SRV).Target; x != "endpoint-0.xds.lb.example.org." {
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t.Errorf("Expected %s, got %s", "endpoint-0.xds.lb.example.org.", x)
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}
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}
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type EndpointHealth struct {
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Address string
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Port uint16
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Health corepb.HealthStatus
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}
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func endpoints(e []EndpointHealth) []*endpointpb.LocalityLbEndpoints {
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return endpointsWithLocality(e, xds.Locality{})
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}
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func endpointsWithLocality(e []EndpointHealth, loc xds.Locality) []*endpointpb.LocalityLbEndpoints {
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ep := make([]*endpointpb.LocalityLbEndpoints, len(e))
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for i := range e {
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ep[i] = &endpointpb.LocalityLbEndpoints{
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Locality: &corepb.Locality{
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Region: loc.Region,
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Zone: loc.Zone,
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SubZone: loc.SubZone,
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},
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LbEndpoints: []*endpointpb.LbEndpoint{{
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HostIdentifier: &endpointpb.LbEndpoint_Endpoint{
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Endpoint: &endpointpb.Endpoint{
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Address: &corepb.Address{
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Address: &corepb.Address_SocketAddress{
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SocketAddress: &corepb.SocketAddress{
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Address: e[i].Address,
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PortSpecifier: &corepb.SocketAddress_PortValue{
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PortValue: uint32(e[i].Port),
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},
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},
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},
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},
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},
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},
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HealthStatus: e[i].Health,
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}},
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}
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}
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return ep
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}
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