Return proper error (#312)

* Return proper error

* Avoid to redefine err. Add integration test for updating

* Do not use temporary files

* Wait until the updated pod is ready

* Fix condition

* Increase timeout and debug info

* Increase debug

* Wait in two steps

* Change matching expression

* Remove debug code

* Increase timeout

* Add debug

* Redirect debug info

* Change approach

* Return to initial state

* Move update test

* Fix RBAC roles permission. Restore order and approach

* Remove unnecessary code

Author: andresmgot

examples/Makefile

@@ -5,6 +5,13 @@ get-python:
 get-python-verify:
 	kubeless function call get-python |egrep hello.world
 
+get-python-update:
+	printf 'def foo():\n%4sreturn "hello world updated"\n' | kubeless function update get-python --runtime python2.7 --handler helloget.foo --from-file /dev/stdin
+	echo "curl localhost:8080/api/v1/proxy/namespaces/default/services/get-python/"
+
+get-python-update-verify:
+	kubeless function call get-python |egrep hello.world.updated
+
 get-python-34:
 	kubeless function deploy get-python --trigger-http --runtime python3.4 --handler helloget.foo --from-file python/helloget.py
 	echo "curl localhost:8080/api/v1/proxy/namespaces/default/services/get-python/"

kubeless-rbac.jsonnet

@@ -7,7 +7,7 @@ local kubeless = import "kubeless.jsonnet";
 local controller_account = kubeless.controller_account;
 local controller_roles = [{
   apiGroups: ["*"],
-  resources: ["services", "deployments", "functions", "configmaps"],
+  resources: ["services", "deployments", "functions", "configmaps", "pods", "replicasets"],
   verbs: ["*"]
 }];
 

pkg/utils/k8sutil.go

@@ -776,7 +776,8 @@ func ensureFuncConfigMap(client kubernetes.Interface, funcObj *spec.Function, or
 
 	_, err = client.Core().ConfigMaps(funcObj.Metadata.Namespace).Create(configMap)
 	if err != nil && k8sErrors.IsAlreadyExists(err) {
-		data, err := json.Marshal(configMap)
+		var data []byte
+		data, err = json.Marshal(configMap)
 		if err != nil {
 			return err
 		}
@@ -807,12 +808,12 @@ func ensureFuncService(client kubernetes.Interface, funcObj *spec.Function, or [
 	}
 	_, err := client.Core().Services(funcObj.Metadata.Namespace).Create(svc)
 	if err != nil && k8sErrors.IsAlreadyExists(err) {
-		data, err := json.Marshal(svc)
+		var data []byte
+		data, err = json.Marshal(svc)
 		if err != nil {
 			return err
 		}
 		_, err = client.Core().Services(funcObj.Metadata.Namespace).Patch(svc.Name, types.StrategicMergePatchType, data)
-
 	}
 	return err
 }
@@ -959,7 +960,8 @@ func ensureFuncDeployment(client kubernetes.Interface, funcObj *spec.Function, o
 
 	_, err = client.Extensions().Deployments(funcObj.Metadata.Namespace).Create(dpm)
 	if err != nil && k8sErrors.IsAlreadyExists(err) {
-		data, err := json.Marshal(dpm)
+		var data []byte
+		data, err = json.Marshal(dpm)
 		if err != nil {
 			return err
 		}
@@ -971,7 +973,11 @@ func ensureFuncDeployment(client kubernetes.Interface, funcObj *spec.Function, o
 		// kick existing function pods then it will be recreated
 		// with the new data mount from updated configmap.
 		// TODO: This is a workaround.  Do something better.
-		pods, err := GetPodsByLabel(client, funcObj.Metadata.Namespace, "function", funcObj.Metadata.Name)
+		var pods *v1.PodList
+		pods, err = GetPodsByLabel(client, funcObj.Metadata.Namespace, "function", funcObj.Metadata.Name)
+		if err != nil {
+			return err
+		}
 		for _, pod := range pods.Items {
 			err = client.Core().Pods(funcObj.Metadata.Namespace).Delete(pod.Name, &metav1.DeleteOptions{})
 			if err != nil && !k8sErrors.IsNotFound(err) {
@@ -1014,14 +1020,12 @@ func ensureFuncJob(client kubernetes.Interface, funcObj *spec.Function, or []met
 
 	_, err := client.BatchV2alpha1().CronJobs(funcObj.Metadata.Namespace).Create(job)
 	if err != nil && k8sErrors.IsAlreadyExists(err) {
-		data, err := json.Marshal(job)
+		var data []byte
+		data, err = json.Marshal(job)
 		if err != nil {
 			return err
 		}
 		_, err = client.BatchV2alpha1().CronJobs(funcObj.Metadata.Namespace).Patch(job.Name, types.StrategicMergePatchType, data)
-		if err != nil {
-			return err
-		}
 	}
 
 	return err

script/libtest.bash

@@ -50,6 +50,16 @@ k8s_wait_for_pod_ready() {
         sleep 1
     done
 }
+k8s_wait_for_uniq_pod() {
+    echo_info "Waiting for pod '${@}' to be the only one running ... "
+    local -i cnt=${TEST_MAX_WAIT_SEC:?}
+    until [[ $(kubectl get pod "${@}" -ogo-template='{{.items|len}}') == 1 ]]; do
+        ((cnt=cnt-1)) || return 1
+        sleep 1
+    done
+    k8s_wait_for_pod_ready "${@}"
+    echo "Finished waiting"
+}
 k8s_wait_for_pod_gone() {
     echo_info "Waiting for pod '${@}' to be gone ... "
     local -i cnt=${TEST_MAX_WAIT_SEC:?}
@@ -243,4 +253,12 @@ test_kubeless_function() {
     esac
     make -sC examples ${func}-verify
 }
+
+test_kubeless_function_update() {
+    local func=${1:?} func_topic
+    echo_info "UPDATE: $func"
+    make -sC examples ${func}-update
+    k8s_wait_for_uniq_pod -l function=${func}
+    make -sC examples ${func}-update-verify
+}
 # vim: sw=4 ts=4 et si

tests/integration-tests.bats

@@ -37,6 +37,7 @@ load ../script/libtest
 # 'bats' lacks loop support, unroll-them-all ->
 @test "Test function: get-python" {
   test_kubeless_function get-python
+  test_kubeless_function_update get-python
 }
 @test "Test function: get-nodejs" {
   test_kubeless_function get-nodejs