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package proxy
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"net/http/httptest"
"strings"
"sync/atomic"
"testing"
"time"
"github.com/coredns/coredns/plugin/test"
"github.com/coredns/coredns/request"
"github.com/mholt/caddy/caddyfile"
"github.com/miekg/dns"
)
func init() {
log.SetOutput(ioutil.Discard)
}
func TestUnhealthy(t *testing.T) {
// High HC interval, we want to test the HC after failed queries.
config := "proxy . %s {\n health_check /healthcheck:%s 10s \nfail_timeout 100ms\n}"
backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.Body.Close()
w.Write([]byte("OK"))
}))
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)))
upstreams, err := NewStaticUpstreams(&c)
if err != nil {
t.Errorf("Expected no error. Got: %s", err)
}
p := &Proxy{Upstreams: &upstreams}
m := new(dns.Msg)
m.SetQuestion("example.org.", dns.TypeA)
state := request.Request{W: &test.ResponseWriter{}, Req: m}
// Should all fail.
for j := 0; j < failureCheck; j++ {
if _, err := p.Forward(state); err == nil {
t.Errorf("Expected error. Got: nil")
}
}
fails := atomic.LoadInt32(&upstreams[0].(*staticUpstream).Hosts[0].Fails)
if fails != 3 {
t.Errorf("Expected %d fails, got %d", 3, fails)
}
// HC should be kicked off, and reset the counter to 0
i := 0
for fails != 0 {
fails = atomic.LoadInt32(&upstreams[0].(*staticUpstream).Hosts[0].Fails)
time.Sleep(100 * time.Microsecond)
i++
}
}
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