mirror of
https://github.com/coredns/coredns.git
synced 2025-10-31 02:03:20 -04:00
16504234e5
* plugin/forward: on demand healtchecking Only start doing health checks when we encouner an error (any error). This uses the new pluing/pkg/up package to abstract away the actual checking. This reduces the LOC quite a bit; does need more testing, unit testing and tcpdumping a bit. * fix tests * Fix readme * Use pkg/up for healthchecks * remove unused channel * more cleanups * update readme * * Again do go generate and go build; still referencing the wrong forward repo? Anyway fixed. * Use pkg/up for doing the healtchecks to cut back on unwanted queries * Change up.Func to return an error instead of a boolean. * Drop the string target argument as it doesn't make sense. * Add healthcheck test on failing to get an upstream answer. TODO(miek): double check Forward and Lookup and how they interact with HC, and if we correctly call close() on those * actual test * Tests here * more tests * try getting rid of host * Get rid of the host indirection * Finish removing hosts * moar testing * import fmt * field is not used * docs * move some stuff * bring back health_check * maxfails=0 test * git and merging, bah * review
137 lines
2.9 KiB
Go
137 lines
2.9 KiB
Go
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)
|
|
}
|
|
}
|