Merge pull request #837 from aledbf/cleanup-interface

Cleanup interface

controllers/nginx/pkg/cmd/controller/nginx.go

@@ -235,23 +235,6 @@ func (n *NGINXController) start(cmd *exec.Cmd, done chan error) {
 	}()
 }
 
-// Reload checks if the running configuration file is different
-// to the specified and reload nginx if required
-func (n NGINXController) Reload(data []byte) ([]byte, bool, error) {
-	if !n.isReloadRequired(data) {
-		return []byte("Reload not required"), false, nil
-	}
-
-	err := ioutil.WriteFile(cfgPath, data, 0644)
-	if err != nil {
-		return nil, false, err
-	}
-
-	o, e := exec.Command(n.binary, "-s", "reload", "-c", cfgPath).CombinedOutput()
-
-	return o, true, e
-}
-
 // BackendDefaults returns the nginx defaults
 func (n NGINXController) BackendDefaults() defaults.Backend {
 	if n.configmap == nil {
@@ -262,36 +245,35 @@ func (n NGINXController) BackendDefaults() defaults.Backend {
 	return ngx_template.ReadConfig(n.configmap.Data).Backend
 }
 
-// isReloadRequired check if the new configuration file is different
-// from the current one.
-func (n NGINXController) isReloadRequired(data []byte) bool {
+// printDiff returns the difference between the running configuration
+// and the new one
+func (n NGINXController) printDiff(data []byte) {
 	in, err := os.Open(cfgPath)
 	if err != nil {
-		return false
+		return
 	}
 	src, err := ioutil.ReadAll(in)
 	in.Close()
 	if err != nil {
-		return false
+		return
 	}
 
 	if !bytes.Equal(src, data) {
-
 		tmpfile, err := ioutil.TempFile("", "nginx-cfg-diff")
 		if err != nil {
 			glog.Errorf("error creating temporal file: %s", err)
-			return false
+			return
 		}
 		defer tmpfile.Close()
 		err = ioutil.WriteFile(tmpfile.Name(), data, 0644)
 		if err != nil {
-			return false
+			return
 		}
 
 		diffOutput, err := diff(src, data)
 		if err != nil {
 			glog.Errorf("error computing diff: %s", err)
-			return true
+			return
 		}
 
 		if glog.V(2) {
@@ -299,9 +281,7 @@ func (n NGINXController) isReloadRequired(data []byte) bool {
 			glog.Infof("%v", string(diffOutput))
 		}
 		os.Remove(tmpfile.Name())
-		return len(diffOutput) > 0
 	}
-	return false
 }
 
 // Info return build information
@@ -404,7 +384,7 @@ func (n *NGINXController) SetListers(lister ingress.StoreLister) {
 // write the configuration file
 // returning nill implies the backend will be reloaded.
 // if an error is returned means requeue the update
-func (n *NGINXController) OnUpdate(ingressCfg ingress.Configuration) ([]byte, error) {
+func (n *NGINXController) OnUpdate(ingressCfg ingress.Configuration) error {
 	var longestName int
 	var serverNameBytes int
 	for _, srv := range ingressCfg.Servers {
@@ -540,15 +520,29 @@ func (n *NGINXController) OnUpdate(ingressCfg ingress.Configuration) ([]byte, er
 		Cfg:                 cfg,
 		IsIPV6Enabled:       n.isIPV6Enabled && !cfg.DisableIpv6,
 	})
+
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	if err := n.testTemplate(content); err != nil {
-		return nil, err
+	err = n.testTemplate(content)
+	if err != nil {
+		return err
 	}
 
-	return content, nil
+	n.printDiff(content)
+
+	err = ioutil.WriteFile(cfgPath, content, 0644)
+	if err != nil {
+		return err
+	}
+
+	o, e := exec.Command(n.binary, "-s", "reload", "-c", cfgPath).CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("%v\n%v", e, string(o))
+	}
+
+	return nil
 }
 
 // nginxHashBucketSize computes the correct nginx hash_bucket_size for a hash with the given longest key

core/pkg/ingress/controller/controller.go

@@ -153,7 +153,7 @@ func newIngressController(config *Configuration) *GenericController {
 		cfg:             config,
 		stopLock:        &sync.Mutex{},
 		stopCh:          make(chan struct{}),
-		syncRateLimiter: flowcontrol.NewTokenBucketRateLimiter(0.5, 1),
+		syncRateLimiter: flowcontrol.NewTokenBucketRateLimiter(0.3, 1),
 		recorder: eventBroadcaster.NewRecorder(scheme.Scheme, api.EventSource{
 			Component: "ingress-controller",
 		}),
@@ -400,27 +400,23 @@ func (ic *GenericController) syncIngress(key interface{}) error {
 		}
 	}
 
-	data, err := ic.cfg.Backend.OnUpdate(ingress.Configuration{
+	err := ic.cfg.Backend.OnUpdate(ingress.Configuration{
 		Backends:            upstreams,
 		Servers:             servers,
 		TCPEndpoints:        ic.getStreamServices(ic.cfg.TCPConfigMapName, api.ProtocolTCP),
 		UDPEndpoints:        ic.getStreamServices(ic.cfg.UDPConfigMapName, api.ProtocolUDP),
 		PassthroughBackends: passUpstreams,
 	})
+
 	if err != nil {
+		incReloadErrorCount()
+		glog.Errorf("unexpected failure restarting the backend: \n%v", err)
 		return err
 	}
 
-	out, reloaded, err := ic.cfg.Backend.Reload(data)
-	if err != nil {
-		incReloadErrorCount()
-		glog.Errorf("unexpected failure restarting the backend: \n%v", string(out))
-		return err
-	}
-	if reloaded {
 	glog.Infof("ingress backend successfully reloaded...")
 	incReloadCount()
-	}
+
 	return nil
 }
 

core/pkg/ingress/types.go

@@ -50,14 +50,6 @@ type Controller interface {
 	// controller status
 	healthz.HealthzChecker
 
-	// Reload takes a byte array representing the new loadbalancer configuration,
-	// and returns a byte array containing any output/errors from the backend and
-	// if a reload was required.
-	// Before returning the backend must load the configuration in the given array
-	// into the loadbalancer and restart it, or fail with an error and message string.
-	// If reloading fails, there should be not change in the running configuration or
-	// the given byte array.
-	Reload(data []byte) ([]byte, bool, error)
 	// OnUpdate callback invoked from the sync queue https://k8s.io/ingress/core/blob/master/pkg/ingress/controller/controller.go#L387
 	// when an update occurs. This is executed frequently because Ingress
 	// controllers watches changes in:
@@ -78,12 +70,11 @@ type Controller interface {
 	// servers (FQDN) and all the locations inside each server. Each
 	// location contains information about all the annotations were configured
 	// https://k8s.io/ingress/core/blob/master/pkg/ingress/types.go#L83
-	// The backend returns the contents of the configuration file or an error
-	// with the reason why was not possible to generate the file.
+	// The backend returns an error if was not possible to update the configuration.
 	//
 	// The returned configuration is then passed to test, and then to reload
 	// if there is no errors.
-	OnUpdate(Configuration) ([]byte, error)
+	OnUpdate(Configuration) error
 	// ConfigMap content of --configmap
 	SetConfig(*api.ConfigMap)
 	// SetListers allows the access of store listers present in the generic controller

examples/custom-controller/server.go

@@ -52,20 +52,11 @@ func (dc DummyController) SetConfig(cfgMap *api.ConfigMap) {
 	log.Printf("Config map %+v", cfgMap)
 }
 
-func (dc DummyController) Reload(data []byte) ([]byte, bool, error) {
-	out, err := exec.Command("echo", string(data)).CombinedOutput()
-	if err != nil {
-		return out, false, err
-	}
-	log.Printf("Reloaded new config %s", out)
-	return out, true, err
-}
-
 func (dc DummyController) Test(file string) *exec.Cmd {
 	return exec.Command("echo", file)
 }
 
-func (dc DummyController) OnUpdate(updatePayload ingress.Configuration) ([]byte, error) {
+func (dc DummyController) OnUpdate(updatePayload ingress.Configuration) error {
 	log.Printf("Received OnUpdate notification")
 	for _, b := range updatePayload.Backends {
 		eps := []string{}
@@ -74,7 +65,9 @@ func (dc DummyController) OnUpdate(updatePayload ingress.Configuration) ([]byte,
 		}
 		log.Printf("%v: %v", b.Name, strings.Join(eps, ", "))
 	}
-	return []byte(`<string containing a configuration file>`), nil
+
+	log.Printf("Reloaded new config")
+	return nil
 }
 
 func (dc DummyController) BackendDefaults() defaults.Backend {