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package proxy
import (
"fmt"
"net/http"
"net/http/httptest"
"strings"
"sync/atomic"
"testing"
"time"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/test"
"github.com/coredns/coredns/request"
"github.com/mholt/caddy/caddyfile"
"github.com/miekg/dns"
)
func TestStop(t *testing.T) {
config := "proxy . %s {\n health_check /healthcheck:%s %dms \n}"
tests := []struct {
intervalInMilliseconds int
numHealthcheckIntervals int
}{
{5, 1},
{5, 2},
{5, 3},
}
for i, test := range tests {
t.Run(fmt.Sprintf("Test %d", i), func(t *testing.T) {
// Set up proxy.
var counter int64
backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.Body.Close()
atomic.AddInt64(&counter, 1)
}))
defer backend.Close()
port := backend.URL[17:] // Remove all crap up to the port
back := backend.URL[7:] // Remove http://
c := caddyfile.NewDispenser("Testfile", strings.NewReader(fmt.Sprintf(config, back, port, test.intervalInMilliseconds)))
upstreams, err := NewStaticUpstreams(&c)
if err != nil {
t.Errorf("Test %d, expected no error. Got: %s", i, err)
}
// Give some time for healthchecks to hit the server.
time.Sleep(time.Duration(test.intervalInMilliseconds*test.numHealthcheckIntervals) * time.Millisecond)
for _, upstream := range upstreams {
if err := upstream.Stop(); err != nil {
t.Errorf("Test %d, expected no error stopping upstream, got: %s", i, err)
}
}
counterAfterShutdown := atomic.LoadInt64(&counter)
// Give some time to see if healthchecks are still hitting the server.
time.Sleep(time.Duration(test.intervalInMilliseconds*test.numHealthcheckIntervals) * time.Millisecond)
if counterAfterShutdown == 0 {
t.Errorf("Test %d, Expected healthchecks to hit test server, got none", i)
}
// health checks are in a go routine now, so one may well occur after we shutdown,
// but we only ever expect one more
counterAfterWaiting := atomic.LoadInt64(&counter)
if counterAfterWaiting > (counterAfterShutdown + 1) {
t.Errorf("Test %d, expected no more healthchecks after shutdown. got: %d healthchecks after shutdown", i, counterAfterWaiting-counterAfterShutdown)
}
})
}
}
func TestProxyRefused(t *testing.T) {
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
ret := new(dns.Msg)
ret.SetReply(r)
ret.Rcode = dns.RcodeRefused
w.WriteMsg(ret)
})
defer s.Close()
p := NewLookup([]string{s.Addr})
state := request.Request{W: &test.ResponseWriter{}, Req: new(dns.Msg)}
state.Req.SetQuestion("example.org.", dns.TypeA)
resp, err := p.Forward(state)
if err != nil {
t.Fatal("Expected to receive reply, but didn't")
}
if resp.Rcode != dns.RcodeRefused {
t.Errorf("Expected rcode to be %d, got %d", dns.RcodeRefused, resp.Rcode)
}
}
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