viper hierarchies, cadvisor impl

docs/devel/e2e-tests.md

@@ -58,6 +58,7 @@ Updated: 5/3/2016
       - [Testing against local clusters](#testing-against-local-clusters)
     - [Version-skewed and upgrade testing](#version-skewed-and-upgrade-testing)
   - [Kinds of tests](#kinds-of-tests)
+    - [Viper configuration and hierarchichal test parameters.](#viper-configuration-and-hierarchichal-test-parameters)
     - [Conformance tests](#conformance-tests)
     - [Defining Conformance Subset](#defining-conformance-subset)
   - [Continuous Integration](#continuous-integration)
@@ -511,6 +512,20 @@ breaking changes, it does *not* block the merge-queue, and thus should run in
 some separate test suites owned by the feature owner(s)
 (see [Continuous Integration](#continuous-integration) below).
 
+### Viper configuration and hierarchichal test parameters.
+
+The future of e2e test configuration idioms will be increasingly defined using viper, and decreasingly via flags.
+
+Flags in general fall apart once tests become sufficiently complicated.  So, even if we could use another flag library, it wouldn't be ideal.
+
+To use viper, rather than flags, to configure your tests:
+
+- Just add "e2e.json" to the current directory you are in, and define parameters in it... i.e. `"kubeconfig":"/tmp/x"`.
+
+Note that advanced testing parameters, and hierarchichally defined parameters, are only defined in viper, to see what they are, you can dive into [TestContextType](../../test/e2e/framework/test_context.go).
+
+In time, it is our intent to add or autogenerate a sample viper configuration that includes all e2e parameters, to ship with kubernetes.
+
 ### Conformance tests
 
 Finally, `[Conformance]` tests represent a subset of the e2e-tests we expect to

hack/verify-flags/known-flags.txt

@@ -533,3 +533,4 @@ windows-line-endings
 www-prefix
 zone-name
 garbage-collector-enabled
+viper-config

test/e2e/cadvisor.go

@@ -27,10 +27,23 @@ import (
 	. "github.com/onsi/ginkgo"
 )
 
-const (
-	maxRetries    = 6
-	sleepDuration = 10 * time.Second
-)
+// returns maxRetries, sleepDuration
+func readConfig() (int, time.Duration) {
+	// Read in configuration settings, reasonable defaults.
+	retry := framework.TestContext.Cadvisor.MaxRetries
+	if framework.TestContext.Cadvisor.MaxRetries == 0 {
+		retry = 6
+		framework.Logf("Overriding default retry value of zero to %d", retry)
+	}
+
+	sleepDurationMS := framework.TestContext.Cadvisor.SleepDurationMS
+	if sleepDurationMS == 0 {
+		sleepDurationMS = 10000
+		framework.Logf("Overriding default milliseconds value of zero to %d", sleepDurationMS)
+	}
+
+	return retry, time.Duration(sleepDurationMS) * time.Millisecond
+}
 
 var _ = framework.KubeDescribe("Cadvisor", func() {
 
@@ -47,7 +60,7 @@ func CheckCadvisorHealthOnAllNodes(c *client.Client, timeout time.Duration) {
 	nodeList, err := c.Nodes().List(api.ListOptions{})
 	framework.ExpectNoError(err)
 	var errors []error
-	retries := maxRetries
+	maxRetries, sleepDuration := readConfig()
 	for {
 		errors = []error{}
 		for _, node := range nodeList.Items {
@@ -63,7 +76,7 @@ func CheckCadvisorHealthOnAllNodes(c *client.Client, timeout time.Duration) {
 		if len(errors) == 0 {
 			return
 		}
-		if retries--; retries <= 0 {
+		if maxRetries--; maxRetries <= 0 {
 			break
 		}
 		framework.Logf("failed to retrieve kubelet stats -\n %v", errors)

test/e2e/framework/test_context.go

@@ -21,7 +21,6 @@ import (
 	"os"
 	"time"
 
-	glog "github.com/golang/glog"
 	"github.com/onsi/ginkgo/config"
 	"github.com/spf13/viper"
 	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
@@ -78,6 +77,18 @@ type TestContextType struct {
 	FeatureGates string
 	// Node e2e specific test context
 	NodeTestContextType
+
+	// Viper-only parameters.  These will in time replace all flags.
+	// Example: Create a file 'e2e.json' with the following:
+	// 	"Cadvisor":{
+	// 		"MaxRetries":"6"
+	// 	}
+
+	Viper    string
+	Cadvisor struct {
+		MaxRetries      int
+		SleepDurationMS int
+	}
 }
 
 // NodeTestContextType is part of TestContextType, it is shared by all node e2e test.
@@ -134,6 +145,7 @@ func RegisterCommonFlags() {
 	flag.StringVar(&TestContext.ReportPrefix, "report-prefix", "", "Optional prefix for JUnit XML reports. Default is empty, which doesn't prepend anything to the default name.")
 	flag.StringVar(&TestContext.ReportDir, "report-dir", "", "Path to the directory where the JUnit XML reports should be saved. Default is empty, which doesn't generate these reports.")
 	flag.StringVar(&TestContext.FeatureGates, "feature-gates", "", "A set of key=value pairs that describe feature gates for alpha/experimental features.")
+	flag.StringVar(&TestContext.Viper, "viper-config", "e2e", "The name of the viper config i.e. 'e2e' will read values from 'e2e.json' locally.  All e2e parameters are meant to be configurable by viper.")
 }
 
 // Register flags specific to the cluster e2e test suite.
@@ -190,25 +202,35 @@ func RegisterNodeFlags() {
 
 // Enable viper configuration management of flags.
 func ViperizeFlags() {
-	// Add viper in a minimal way.
-	// Flag interop isnt possible, since 'go test' coupling to flag.Parse.
-	viper.SetConfigName("e2e")
-	viper.AddConfigPath(".")
-	viper.ReadInConfig()
 
 	// TODO @jayunit100: Maybe a more elegant viper-flag integration for the future?
 	// For now, we layer it on top, because 'flag' deps of 'go test' make pflag wrappers
 	// fragile, seeming to force 'flag' to have deep awareness of pflag params.
 	RegisterCommonFlags()
 	RegisterClusterFlags()
+
 	flag.Parse()
 
-	viperFlagSetter := func(f *flag.Flag) {
-		if viper.IsSet(f.Name) {
-			glog.V(4).Infof("[viper config] Overwriting, found a settting for %v %v", f.Name, f.Value)
-			f.Value.Set(viper.GetString(f.Name))
-		}
-	}
-	// Each flag that we've declared can be set via viper.
-	flag.VisitAll(viperFlagSetter)
+	// Add viper in a minimal way.
+	// Flag interop isnt possible, since 'go test' coupling to flag.Parse.
+	// This must be done after common flags are registered, since Viper is a flag option.
+	viper.SetConfigName(TestContext.Viper)
+	viper.AddConfigPath(".")
+	viper.ReadInConfig()
+
+	viper.Unmarshal(&TestContext)
+
+	/** This can be used to overwrite a flag value.
+	*
+	*	viperFlagSetter := func(f *flag.Flag) {
+	*		if viper.IsSet(f.Name) {
+	*			glog.V(4).Infof("[viper config] Overwriting, found a settting for %v %v", f.Name, f.Value)
+	*			viper.Unmarshal(&TestContext)
+	*			// f.Value.Set(viper.GetString(f.Name))
+	*		}
+	*	}
+	*	// Each flag that we've declared can be set via viper.
+	*	flag.VisitAll(viperFlagSetter)
+	*
+	 */
 }