Fix executor tries to create a new deployment when a function is updated (#524)

Newdeploy manager now checks the existence of function service cache by function UID before trying to create a new deployment. And return the cached fsvc directly if the cache exists.

executor/newdeploy/newdeploy.go

@@ -58,7 +58,10 @@ func (deploy *NewDeploy) createOrGetDeployment(fn *crd.Function, env *crd.Enviro
 	}
 
 	existingDepl, err := deploy.kubernetesClient.ExtensionsV1beta1().Deployments(deploy.namespace).Get(deployName, metav1.GetOptions{})
-	if err == nil && existingDepl.Status.ReadyReplicas >= replicas {
+	if err == nil {
+		if existingDepl.Status.ReadyReplicas < replicas {
+			existingDepl, err = deploy.waitForDeploy(existingDepl, replicas)
+		}
 		return existingDepl, err
 	}
 
@@ -75,18 +78,7 @@ func (deploy *NewDeploy) createOrGetDeployment(fn *crd.Function, env *crd.Enviro
 			return nil, err
 		}
 
-		for i := 0; i < 120; i++ {
-			latestDepl, err := deploy.kubernetesClient.ExtensionsV1beta1().Deployments(deploy.namespace).Get(depl.Name, metav1.GetOptions{})
-			if err != nil {
-				return nil, err
-			}
-			//TODO check for imagePullerror
-			if latestDepl.Status.ReadyReplicas == replicas {
-				return latestDepl, err
-			}
-			time.Sleep(time.Second)
-		}
-		return nil, errors.New("failed to create deployment within timeout window")
+		return deploy.waitForDeploy(depl, replicas)
 	}
 
 	return nil, err
@@ -459,3 +451,18 @@ func (deploy *NewDeploy) deleteSvc(ns string, name string) error {
 	}
 	return nil
 }
+
+func (deploy *NewDeploy) waitForDeploy(depl *v1beta1.Deployment, replicas int32) (*v1beta1.Deployment, error) {
+	for i := 0; i < 120; i++ {
+		latestDepl, err := deploy.kubernetesClient.ExtensionsV1beta1().Deployments(deploy.namespace).Get(depl.Name, metav1.GetOptions{})
+		if err != nil {
+			return nil, err
+		}
+		//TODO check for imagePullerror
+		if latestDepl.Status.ReadyReplicas >= replicas {
+			return latestDepl, err
+		}
+		time.Sleep(time.Second)
+	}
+	return nil, errors.New("failed to create deployment within timeout window")
+}