dfc71df07d
Allow HTTP health check to be performed against a regular DNS upstream server. TODO: Add tests.
95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package test
|
|
|
|
import (
|
|
"io"
|
|
"io/ioutil"
|
|
"log"
|
|
"net/http"
|
|
"net/http/httptest"
|
|
"net/url"
|
|
"testing"
|
|
|
|
"github.com/coredns/coredns/middleware/proxy"
|
|
"github.com/coredns/coredns/middleware/test"
|
|
"github.com/coredns/coredns/request"
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
func TestProxyWithHTTPCheckOK(t *testing.T) {
|
|
log.SetOutput(ioutil.Discard)
|
|
|
|
healthCheckServer := httptest.NewServer(http.HandlerFunc(
|
|
func(w http.ResponseWriter, r *http.Request) {
|
|
w.WriteHeader(http.StatusOK)
|
|
io.WriteString(w, "OK\n")
|
|
}))
|
|
defer healthCheckServer.Close()
|
|
|
|
healthCheckURL, err := url.Parse(healthCheckServer.URL)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
healthCheckPort := healthCheckURL.Port()
|
|
|
|
name, rm, err := test.TempFile(".", exampleOrg)
|
|
if err != nil {
|
|
t.Fatalf("failed to create zone: %s", err)
|
|
}
|
|
defer rm()
|
|
|
|
// We have to bind to 127.0.0.1 because the server started by
|
|
// httptest.NewServer does, and the IP addresses of the backend
|
|
// DNS and HTTP servers must match.
|
|
authoritativeCorefile := `example.org:0 {
|
|
bind 127.0.0.1
|
|
file ` + name + `
|
|
}
|
|
`
|
|
|
|
authoritativeInstance, err := CoreDNSServer(authoritativeCorefile)
|
|
if err != nil {
|
|
t.Fatalf("Could not get CoreDNS authoritative instance: %s", err)
|
|
}
|
|
|
|
authoritativeAddr, _ := CoreDNSServerPorts(authoritativeInstance, 0)
|
|
if authoritativeAddr == "" {
|
|
t.Fatalf("Could not get CoreDNS authoritative instance UDP listening port")
|
|
}
|
|
defer authoritativeInstance.Stop()
|
|
|
|
proxyCorefile := `example.org:0 {
|
|
proxy . ` + authoritativeAddr + ` {
|
|
health_check /health:` + healthCheckPort + ` 1s
|
|
|
|
}
|
|
}
|
|
`
|
|
|
|
proxyInstance, err := CoreDNSServer(proxyCorefile)
|
|
if err != nil {
|
|
t.Fatalf("Could not get CoreDNS proxy instance: %s", err)
|
|
}
|
|
|
|
proxyAddr, _ := CoreDNSServerPorts(proxyInstance, 0)
|
|
if proxyAddr == "" {
|
|
t.Fatalf("Could not get CoreDNS proxy instance UDP listening port")
|
|
}
|
|
defer proxyInstance.Stop()
|
|
|
|
p := proxy.NewLookup([]string{proxyAddr})
|
|
state := request.Request{W: &test.ResponseWriter{}, Req: new(dns.Msg)}
|
|
resp, err := p.Lookup(state, "example.org.", dns.TypeA)
|
|
if err != nil {
|
|
t.Fatal("Expected to receive reply, but didn't")
|
|
}
|
|
// expect answer section with A record in it
|
|
if len(resp.Answer) == 0 {
|
|
t.Fatalf("Expected to at least one RR in the answer section, got none: %s", resp)
|
|
}
|
|
if resp.Answer[0].Header().Rrtype != dns.TypeA {
|
|
t.Errorf("Expected RR to A, got: %d", resp.Answer[0].Header().Rrtype)
|
|
}
|
|
if resp.Answer[0].(*dns.A).A.String() != "127.0.0.1" {
|
|
t.Errorf("Expected 127.0.0.1, got: %s", resp.Answer[0].(*dns.A).A.String())
|
|
}
|
|
}
|