Introduce events flag for describers #24554

ingvagabund · 2016-04-20T20:17:39Z

Printing events for a given object is not always needed. Thus, introducing --show-events=false to kubectl describe to skip events printing.

Fixes: #24239

0xmichalis · 2016-04-21T08:36:57Z

pkg/kubectl/describe.go

@@ -53,7 +53,13 @@ import (
 // if the output could not be generated. Implementers typically
 // abstract the retrieval of the named object from a remote server.
 type Describer interface {
-	Describe(namespace, name string) (output string, err error)
+	Describe(namespace, name string, describerSetting *DescriberSetting) (output string, err error)


Is there any reason for describerSetting to be a pointer?

At this point, no. Later, DescriberSetting could contain non-pointer variables you would not want to copy.

Any reason for it not to be a pointer?

We avoid pointers in apis unless the absense of a value (nil) is something we care about.

Ok, will update the PR.

ingvagabund · 2016-04-21T12:50:05Z

There are three objects that has no unit-tests at all: HorizontalPodAutoscalerDescriber, IngressDescriber, JobDescriber. I could not found proper fake client for them. Could be worth writing one.

ncdc · 2016-04-21T14:12:13Z

cc @kubernetes/rh-cluster-infra @kubernetes/kubectl @kubernetes/rh-ux

ncdc · 2016-04-21T16:19:02Z

pkg/kubectl/describe.go

+
+// DescriberSetting holds display configuration for each object
+// describer to control what is printed.
+type DescriberSetting struct {


I think this should be pluralized - DescriberSettings. Or maybe DescriberOptions.

I though setting is uncountable till this moment. Looks like google says "use plural if there are more things to set". DescriberConfig would work too. If the describer is meant just to "render", rendering settings is quite common. I like this comment [1]. DescriberPreferences is the closest to the behaviour from the point of the describer. On the other hand DescriberOptions makes more sense from the point of the kubectl describe command as events=true is by default and changing to false is providing option to change it.

DescribeOptions is already used so DescriberOptions counts out. Let's use DescriberSettings if noone against :).

[1] http://stackoverflow.com/questions/2074384/options-settings-properties-configuration-preferences-when-and-why/28812395#28812395

ncdc · 2016-04-21T16:20:59Z

Need to run hack/update-generated-docs.sh.

Could you also please add some tests to hack/test-cmd.sh testing usage of this new flag, if possible?

ingvagabund · 2016-04-21T21:25:49Z

@ncdc, yeah, I run that command at the end of our standup and blew my computer away. Sometimes the go compiler just eats all my memory. Was thinking about hack/test-cmd too. It is basically entire cluster set up without bare metal. A lot of objects created. Will put my eye on it tomorrow morning.

ncdc · 2016-04-22T13:30:16Z

There are three objects that has no unit-tests at all: HorizontalPodAutoscalerDescriber, IngressDescriber, JobDescriber. I could not found proper fake client for them. Could be worth writing one

Create separate issues for each one?

j3ffml · 2016-04-25T16:18:50Z

cc @janetkuo

derekwaynecarr · 2016-04-25T17:57:06Z

You will need to add the flag here:
https://github.com/kubernetes/kubernetes/blob/master/hack/verify-flags/known-flags.txt

derekwaynecarr · 2016-04-25T18:00:16Z

pkg/kubectl/cmd/describe.go

@@ -93,11 +94,12 @@ func NewCmdDescribe(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 	kubectl.AddJsonFilenameFlag(cmd, &options.Filenames, usage)
 	cmdutil.AddRecursiveFlag(cmd, &options.Recursive)
 	cmd.Flags().StringP("selector", "l", "", "Selector (label query) to filter on")
+	cmd.Flags().BoolVar(&describerSettings.ShowEvents, "events", true, "If true, display also object events.")


I prefer we call the flag show-events, we use that convention already with the show-all flag, and it parallels the name in the describer settings.

I would update the text to be If true, display events related to the described object.

ncdc · 2016-04-26T14:34:59Z

@k8s-bot test node e2e experimental issue: #23916

j3ffml · 2016-04-26T16:38:57Z

pkg/kubectl/describe_test.go

+				},
+			}, events),
+		},
+		//"HorizontalPodAutoscalerDescriber": &HorizontalPodAutoscalerDescriber{


Did you mean to comment this out?

I have changed all the three describers into TODO note. Opened separate issue for them [1].

[1] #24731

eparis · 2016-04-29T12:26:11Z

/me has no idea what the bot did in #24554 (comment)

j3ffml · 2016-04-29T16:27:25Z

Looks good, but please squash commits.

ingvagabund · 2016-05-05T20:21:17Z

New PetSetDescriber introduced, not covered in this PR.

Introduce DescriberSettings for Describer display options Introduce --show-events flag and DescriberSettings in Describer methods Introduce unit-tests Regenerated kubectl describe docs Add events flag tests to test-cmd.sh Signed-off-by: [email protected] Signed-off-by: [email protected]

ingvagabund · 2016-05-06T10:33:56Z

@ncdc @eparis @jlowdermilk can you reset lgtm flag?

smarterclayton · 2016-05-06T16:25:09Z

LGTM

k8s-bot · 2016-05-08T08:34:43Z

GCE e2e build/test passed for commit dd2c9c5.

k8s-github-robot · 2016-05-08T21:04:49Z

@k8s-bot test this [submit-queue is verifying that this PR is safe to merge]

k8s-bot · 2016-05-08T21:37:31Z

GCE e2e build/test passed for commit dd2c9c5.

k8s-github-robot · 2016-05-08T21:41:28Z

Automatic merge from submit-queue

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ingvagabund changed the title ~~WIP: introduce events flag for describers~~ Introduce events flag for describers Apr 25, 2016

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test-cmd.sh: extend tests with kubectl describe --events=false|true flag check #24730

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Introduce events flag for describers #24554

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Introduce events flag for describers #24554

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