mirror of
https://github.com/coredns/coredns.git
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4de8fb57b2
* feat: option to return servfail if upstreams are down Signed-off-by: Puneet Loya <puneetloya@Puneets-MBP.attlocal.net> * fix based on review comments and added to Readme Signed-off-by: Puneet Loya <puneetloya@Puneets-MBP.attlocal.net> * add tests to improve code coverage Signed-off-by: Puneet Loya <puneetloya@Puneets-MBP.attlocal.net> * added failfast_all_unhealthy_upstreams option to forward plugin Signed-off-by: Puneet Loya <puneetloya@Puneets-MBP.attlocal.net> --------- Signed-off-by: Puneet Loya <puneetloya@Puneets-MBP.attlocal.net> Co-authored-by: Puneet Loya <puneetloya@Puneets-MBP.attlocal.net>
356 lines
9.1 KiB
Go
356 lines
9.1 KiB
Go
package forward
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import (
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"context"
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"sync/atomic"
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"testing"
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"time"
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"github.com/coredns/coredns/plugin/pkg/dnstest"
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"github.com/coredns/coredns/plugin/pkg/proxy"
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"github.com/coredns/coredns/plugin/pkg/transport"
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"github.com/coredns/coredns/plugin/test"
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"github.com/miekg/dns"
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)
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func TestHealth(t *testing.T) {
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defaultTimeout = 10 * time.Millisecond
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i := uint32(0)
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q := uint32(0)
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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if atomic.LoadUint32(&q) == 0 { //drop the first query to trigger health-checking
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atomic.AddUint32(&q, 1)
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return
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}
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if r.Question[0].Name == "." && r.RecursionDesired == true {
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atomic.AddUint32(&i, 1)
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}
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ret := new(dns.Msg)
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ret.SetReply(r)
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w.WriteMsg(ret)
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})
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defer s.Close()
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p := proxy.NewProxy("TestHealth", s.Addr, transport.DNS)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetWriteTimeout(10 * time.Millisecond)
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f := New()
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f.SetProxy(p)
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defer f.OnShutdown()
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req := new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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time.Sleep(20 * time.Millisecond)
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i1 := atomic.LoadUint32(&i)
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if i1 != 1 {
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t.Errorf("Expected number of health checks with RecursionDesired==true to be %d, got %d", 1, i1)
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}
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}
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func TestHealthTCP(t *testing.T) {
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defaultTimeout = 10 * time.Millisecond
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i := uint32(0)
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q := uint32(0)
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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if atomic.LoadUint32(&q) == 0 { //drop the first query to trigger health-checking
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atomic.AddUint32(&q, 1)
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return
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}
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if r.Question[0].Name == "." && r.RecursionDesired == true {
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atomic.AddUint32(&i, 1)
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}
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ret := new(dns.Msg)
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ret.SetReply(r)
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w.WriteMsg(ret)
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})
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defer s.Close()
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p := proxy.NewProxy("TestHealthTCP", s.Addr, transport.DNS)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetWriteTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetTCPTransport()
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f := New()
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f.SetProxy(p)
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defer f.OnShutdown()
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req := new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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f.ServeDNS(context.TODO(), &test.ResponseWriter{TCP: true}, req)
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time.Sleep(20 * time.Millisecond)
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i1 := atomic.LoadUint32(&i)
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if i1 != 1 {
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t.Errorf("Expected number of health checks with RecursionDesired==true to be %d, got %d", 1, i1)
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}
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}
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func TestHealthNoRecursion(t *testing.T) {
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defaultTimeout = 10 * time.Millisecond
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i := uint32(0)
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q := uint32(0)
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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if atomic.LoadUint32(&q) == 0 { //drop the first query to trigger health-checking
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atomic.AddUint32(&q, 1)
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return
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}
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if r.Question[0].Name == "." && r.RecursionDesired == false {
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atomic.AddUint32(&i, 1)
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}
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ret := new(dns.Msg)
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ret.SetReply(r)
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w.WriteMsg(ret)
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})
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defer s.Close()
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p := proxy.NewProxy("TestHealthNoRecursion", s.Addr, transport.DNS)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetWriteTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetRecursionDesired(false)
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f := New()
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f.SetProxy(p)
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defer f.OnShutdown()
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req := new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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time.Sleep(20 * time.Millisecond)
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i1 := atomic.LoadUint32(&i)
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if i1 != 1 {
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t.Errorf("Expected number of health checks with RecursionDesired==false to be %d, got %d", 1, i1)
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}
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}
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func TestHealthTimeout(t *testing.T) {
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defaultTimeout = 10 * time.Millisecond
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i := uint32(0)
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q := uint32(0)
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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if r.Question[0].Name == "." {
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// health check, answer
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atomic.AddUint32(&i, 1)
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ret := new(dns.Msg)
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ret.SetReply(r)
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w.WriteMsg(ret)
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return
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}
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if atomic.LoadUint32(&q) == 0 { //drop only first query
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atomic.AddUint32(&q, 1)
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return
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}
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ret := new(dns.Msg)
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ret.SetReply(r)
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w.WriteMsg(ret)
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})
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defer s.Close()
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p := proxy.NewProxy("TestHealthTimeout", s.Addr, transport.DNS)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetWriteTimeout(10 * time.Millisecond)
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f := New()
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f.SetProxy(p)
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defer f.OnShutdown()
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req := new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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time.Sleep(20 * time.Millisecond)
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i1 := atomic.LoadUint32(&i)
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if i1 != 1 {
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t.Errorf("Expected number of health checks to be %d, got %d", 1, i1)
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}
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}
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func TestHealthMaxFails(t *testing.T) {
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defaultTimeout = 10 * time.Millisecond
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//,hcInterval = 10 * time.Millisecond
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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// timeout
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})
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defer s.Close()
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p := proxy.NewProxy("TestHealthMaxFails", s.Addr, transport.DNS)
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p.SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetWriteTimeout(10 * time.Millisecond)
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f := New()
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f.hcInterval = 10 * time.Millisecond
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f.maxfails = 2
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f.SetProxy(p)
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defer f.OnShutdown()
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req := new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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time.Sleep(100 * time.Millisecond)
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fails := p.Fails()
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if !p.Down(f.maxfails) {
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t.Errorf("Expected Proxy fails to be greater than %d, got %d", f.maxfails, fails)
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}
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}
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func TestHealthNoMaxFails(t *testing.T) {
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defaultTimeout = 10 * time.Millisecond
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i := uint32(0)
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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if r.Question[0].Name == "." {
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// health check, answer
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atomic.AddUint32(&i, 1)
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ret := new(dns.Msg)
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ret.SetReply(r)
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w.WriteMsg(ret)
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}
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})
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defer s.Close()
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p := proxy.NewProxy("TestHealthNoMaxFails", s.Addr, transport.DNS)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetWriteTimeout(10 * time.Millisecond)
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f := New()
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f.maxfails = 0
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f.SetProxy(p)
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defer f.OnShutdown()
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req := new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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time.Sleep(20 * time.Millisecond)
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i1 := atomic.LoadUint32(&i)
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if i1 != 0 {
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t.Errorf("Expected number of health checks to be %d, got %d", 0, i1)
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}
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}
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func TestHealthDomain(t *testing.T) {
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defaultTimeout = 10 * time.Millisecond
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hcDomain := "example.org."
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i := uint32(0)
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q := uint32(0)
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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if atomic.LoadUint32(&q) == 0 { //drop the first query to trigger health-checking
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atomic.AddUint32(&q, 1)
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return
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}
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if r.Question[0].Name == hcDomain && r.RecursionDesired == true {
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atomic.AddUint32(&i, 1)
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}
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ret := new(dns.Msg)
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ret.SetReply(r)
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w.WriteMsg(ret)
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})
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defer s.Close()
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p := proxy.NewProxy("TestHealthDomain", s.Addr, transport.DNS)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetWriteTimeout(10 * time.Millisecond)
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p.GetHealthchecker().SetDomain(hcDomain)
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f := New()
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f.SetProxy(p)
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defer f.OnShutdown()
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req := new(dns.Msg)
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req.SetQuestion(".", dns.TypeNS)
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f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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time.Sleep(20 * time.Millisecond)
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i1 := atomic.LoadUint32(&i)
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if i1 != 1 {
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t.Errorf("Expected number of health checks with Domain==%s to be %d, got %d", hcDomain, 1, i1)
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}
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}
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func TestAllUpstreamsDown(t *testing.T) {
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qs := uint32(0)
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s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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// count non-healthcheck queries
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if r.Question[0].Name != "." {
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atomic.AddUint32(&qs, 1)
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}
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// timeout
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})
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defer s.Close()
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s1 := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
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// count non-healthcheck queries
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if r.Question[0].Name != "." {
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atomic.AddUint32(&qs, 1)
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}
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// timeout
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})
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defer s1.Close()
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p := proxy.NewProxy("TestHealthAllUpstreamsDown", s.Addr, transport.DNS)
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p1 := proxy.NewProxy("TestHealthAllUpstreamsDown2", s1.Addr, transport.DNS)
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p.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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p1.GetHealthchecker().SetReadTimeout(10 * time.Millisecond)
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f := New()
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f.SetProxy(p)
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f.SetProxy(p1)
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f.failfastUnhealthyUpstreams = true
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f.maxfails = 1
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// Make proxys fail by checking health twice
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// i.e, fails > maxfails
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for range f.maxfails + 1 {
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p.GetHealthchecker().Check(p)
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p1.GetHealthchecker().Check(p1)
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}
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defer f.OnShutdown()
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// Check if all proxies are down
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if !p.Down(f.maxfails) || !p1.Down(f.maxfails) {
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t.Fatalf("Expected all proxies to be down")
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}
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req := new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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resp, err := f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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if resp != dns.RcodeServerFailure {
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t.Errorf("Expected Response code: %d, Got: %d", dns.RcodeServerFailure, resp)
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}
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if err != ErrNoHealthy {
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t.Errorf("Expected error message: no healthy proxies, Got: %s", err.Error())
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}
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q1 := atomic.LoadUint32(&qs)
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if q1 != 0 {
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t.Errorf("Expected queries to the upstream: 0, Got: %d", q1)
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}
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// set failfast to false to check if queries get answered
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f.failfastUnhealthyUpstreams = false
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req = new(dns.Msg)
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req.SetQuestion("example.org.", dns.TypeA)
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_, err = f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
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if err == ErrNoHealthy {
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t.Error("Unexpected error message: no healthy proxies")
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}
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q1 = atomic.LoadUint32(&qs)
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if q1 != 1 {
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t.Errorf("Expected queries to the upstream: 1, Got: %d", q1)
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}
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}
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