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|
package forward
import (
"sync/atomic"
"testing"
"time"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
"golang.org/x/net/context"
)
func TestHealth(t *testing.T) {
const expected = 0
i := uint32(0)
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
if r.Question[0].Name == "." {
atomic.AddUint32(&i, 1)
}
ret := new(dns.Msg)
ret.SetReply(r)
w.WriteMsg(ret)
})
defer s.Close()
p := NewProxy(s.Addr, nil /* no TLS */)
f := New()
f.SetProxy(p)
defer f.Close()
req := new(dns.Msg)
req.SetQuestion("example.org.", dns.TypeA)
f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
time.Sleep(1 * time.Second)
i1 := atomic.LoadUint32(&i)
if i1 != expected {
t.Errorf("Expected number of health checks to be %d, got %d", expected, i1)
}
}
func TestHealthTimeout(t *testing.T) {
const expected = 1
i := uint32(0)
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
if r.Question[0].Name == "." {
// health check, answer
atomic.AddUint32(&i, 1)
ret := new(dns.Msg)
ret.SetReply(r)
w.WriteMsg(ret)
}
// not a health check, do a timeout
})
defer s.Close()
p := NewProxy(s.Addr, nil /* no TLS */)
f := New()
f.SetProxy(p)
defer f.Close()
req := new(dns.Msg)
req.SetQuestion("example.org.", dns.TypeA)
f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
time.Sleep(1 * time.Second)
i1 := atomic.LoadUint32(&i)
if i1 != expected {
t.Errorf("Expected number of health checks to be %d, got %d", expected, i1)
}
}
func TestHealthFailTwice(t *testing.T) {
const expected = 2
i := uint32(0)
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
if r.Question[0].Name == "." {
atomic.AddUint32(&i, 1)
i1 := atomic.LoadUint32(&i)
// Timeout health until we get the second one
if i1 < 2 {
return
}
ret := new(dns.Msg)
ret.SetReply(r)
w.WriteMsg(ret)
}
})
defer s.Close()
p := NewProxy(s.Addr, nil /* no TLS */)
f := New()
f.SetProxy(p)
defer f.Close()
req := new(dns.Msg)
req.SetQuestion("example.org.", dns.TypeA)
f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
time.Sleep(3 * time.Second)
i1 := atomic.LoadUint32(&i)
if i1 != expected {
t.Errorf("Expected number of health checks to be %d, got %d", expected, i1)
}
}
func TestHealthMaxFails(t *testing.T) {
const expected = 0
i := uint32(0)
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
// timeout
})
defer s.Close()
p := NewProxy(s.Addr, nil /* no TLS */)
f := New()
f.maxfails = 0
f.SetProxy(p)
defer f.Close()
req := new(dns.Msg)
req.SetQuestion("example.org.", dns.TypeA)
f.ServeDNS(context.TODO(), &test.ResponseWriter{}, req)
time.Sleep(1 * time.Second)
i1 := atomic.LoadUint32(&i)
if i1 != expected {
t.Errorf("Expected number of health checks to be %d, got %d", expected, i1)
}
}
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