fix: fix slice init length #127785

huochexizhan · 2024-10-01T14:58:00Z

What type of PR is this?

/kind bug

What this PR does / why we need it:

The intention here should be to initialize a slice with a capacity of len(topologies) rather than initializing the length of this slice.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

fix slice init length

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

linux-foundation-easycla · 2024-10-01T14:58:05Z

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✅ login: huochexizhan (6d853da)

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mmorel-35 · 2024-10-02T04:08:11Z

Hi @huochexizhan ,
It looks like something that could have been identified with the use of makezero, do you agree?
And if you do, maybe it worth adding the linter so this best practice stay always applied ?

googs1025 · 2024-10-02T15:25:47Z

pkg/apis/storage/validation/validation.go

@@ -274,7 +274,7 @@ func validateAllowedTopologies(topologies []api.TopologySelectorTerm, fldPath *f
 		return allErrs
 	}

-	rawTopologies := make([]map[string]sets.Set[string], len(topologies))
+	rawTopologies := make([]map[string]sets.Set[string], 0, len(topologies))


If we use the modified method, the list will be considered empty but the capacity will be len(topologies). Is this what we expect? The original initialization method should create len(topologies) objects, right?

rawTopologies := make([]map[string]sets.Set[string], 0, len(topologies))

yeah, see below it is appending values to the list, that it seems are the supposed to be compared against, right now the len(topologies) entries are empty https://go.dev/play/p/eXaQdxsH5GP

thanks for answering this! :)

upps #127785 (comment) , it seems the logic depended on the empty values

aojea · 2024-10-03T20:44:01Z

/ok-to-test
/lgmt
/assign @thockin

thockin

Thanks!

/lgtm
/approve

k8s-ci-robot · 2024-10-03T21:06:51Z

LGTM label has been added.

Git tree hash: f28eec9155b7faebb954e2c9aea94a4ad271d129

k8s-ci-robot · 2024-10-03T21:07:02Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: huochexizhan, thockin

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aojea · 2024-10-04T10:51:34Z

interesting side effect @liggitt @thockin , since the slice was created with empty values, and the code considered invaliud duplicates, the empty value was considered invalid ... and now we need to keep this behavior, so we should keep injecting one empty case 🤕

{Failed;  === RUN   TestValidateAllowedTopologies
    validation_test.go:878: Expected failure for test "empty MatchLabelExpressions", got success
--- FAIL: TestValidateAllowedTopologies (0.00s)

huochexizhan · 2024-10-08T10:35:01Z

Thank! If there's anything I need to do, please feel free to let me know

thockin · 2024-11-07T23:40:37Z

I think the empty value SHOULD be allowed - it has a well defined meaning:

// TopologySelectorTerm represents the result of label queries.
// A null or empty topology selector term matches no objects.
// The requirements of them are ANDed.
// It provides a subset of functionality as NodeSelectorTerm.
// This is an alpha feature and may change in the future.
type TopologySelectorTerm struct {                                                                                                   
    // A list of topology selector requirements by labels.
    // +optional
    MatchLabelExpressions []TopologySelectorLabelRequirement
}

thockin · 2024-11-07T23:41:35Z

I think the correct thing to do here is fix the code and also:

diff --git a/pkg/apis/storage/validation/validation_test.go b/pkg/apis/storage/validation/validation_test.go
index 9f8c5bd0f72..16bd94ff364 100644
--- a/pkg/apis/storage/validation/validation_test.go
+++ b/pkg/apis/storage/validation/validation_test.go
@@ -837,7 +837,7 @@ func TestValidateAllowedTopologies(t *testing.T) {
                },
                "empty MatchLabelExpressions": {
                        class:         makeClass(&waitingMode, topologyEmptyMatchLabelExpressions),
-                       shouldSucceed: false,
+                       shouldSucceed: true,
                },
                "duplicate MatchLabelExpression keys": {
                        class:         makeClass(&waitingMode, topologyDupKeys),

Signed-off-by: huochexizhan <[email protected]>

huochexizhan · 2024-11-19T04:40:14Z

I think the correct thing to do here is fix the code and also:

diff --git a/pkg/apis/storage/validation/validation_test.go b/pkg/apis/storage/validation/validation_test.go
index 9f8c5bd0f72..16bd94ff364 100644
--- a/pkg/apis/storage/validation/validation_test.go
+++ b/pkg/apis/storage/validation/validation_test.go
@@ -837,7 +837,7 @@ func TestValidateAllowedTopologies(t *testing.T) {
                },
                "empty MatchLabelExpressions": {
                        class:         makeClass(&waitingMode, topologyEmptyMatchLabelExpressions),
-                       shouldSucceed: false,
+                       shouldSucceed: true,
                },
                "duplicate MatchLabelExpression keys": {
                        class:         makeClass(&waitingMode, topologyDupKeys),

Sorry to deal with it so late.

Has been modified, please review again.

thockin · 2024-11-19T17:30:39Z

Looking at this again, the effect of this is that we are loosening validation. It used to behave like:

$ cat /tmp/test-sc.yaml 
allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: test-empty-topology
provisioner: test.example.com
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer
allowedTopologies:
  - {}

$ k --context=diy apply -f /tmp/test-sc.yaml 
The StorageClass "test-empty-topology" is invalid: allowedTopologies[0].matchLabelExpressions: Duplicate value: ""

Note the "duplicate value" error.

If we change this, then my YAML above will be accepted and stored. If a user subsequently rolls back to the previosu k8s release, this will fail to validate any update operations.

Worse, docs are somewhat conflicting:

staging/src/k8s.io/api/storage/v1/types.go:

 73     // allowedTopologies restrict the node topologies where volumes can be dynamically provisioned.
 74     // Each volume plugin defines its own supported topology specifications.
 75     // An empty TopologySelectorTerm list means there is no topology restriction.
 76     // This field is only honored by servers that enable the VolumeScheduling feature.
 77     // +optional
 78     // +listType=atomic
 79     AllowedTopologies []v1.TopologySelectorTerm `json:"allowedTopologies,omitempty" protobuf:"bytes,8,rep,name=allowedTopologies"    `

vs:

staging/src/k8s.io/api/core/v1/types.go:

3469 // A topology selector term represents the result of label queries.
3470 // A null or empty topology selector term matches no objects.
3471 // The requirements of them are ANDed.
3472 // It provides a subset of functionality as NodeSelectorTerm.
3473 // This is an alpha feature and may change in the future.
3474 // +structType=atomic
3475 type TopologySelectorTerm struct {

@msau42 @jsafrane - can you spend a moment thinking about this?

I see two paths:

Loosen validation in the "usual" way: add an alpha gate, tolerate the value in 33, move the gate to beta or even GA in 34.
Fix validation to fail on empty terms with a proper error, document it.

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huochexizhan · 2025-02-28T11:18:01Z

Thanks. Anything need I to do?

thockin · 2025-02-28T23:57:04Z

#127785 (comment)

huochexizhan · 2025-03-01T00:58:58Z

#127785 (comment)

Thanks!

huochexizhan · 2025-03-01T00:59:12Z

Looking at this again, the effect of this is that we are loosening validation. It used to behave like:
$ cat /tmp/test-sc.yaml 
allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: test-empty-topology
provisioner: test.example.com
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer
allowedTopologies:
  - {}

$ k --context=diy apply -f /tmp/test-sc.yaml 
The StorageClass "test-empty-topology" is invalid: allowedTopologies[0].matchLabelExpressions: Duplicate value: ""
Note the "duplicate value" error.

If we change this, then my YAML above will be accepted and stored. If a user subsequently rolls back to the previosu k8s release, this will fail to validate any update operations.

Worse, docs are somewhat conflicting:

staging/src/k8s.io/api/storage/v1/types.go:
 73     // allowedTopologies restrict the node topologies where volumes can be dynamically provisioned.
 74     // Each volume plugin defines its own supported topology specifications.
 75     // An empty TopologySelectorTerm list means there is no topology restriction.
 76     // This field is only honored by servers that enable the VolumeScheduling feature.
 77     // +optional
 78     // +listType=atomic
 79     AllowedTopologies []v1.TopologySelectorTerm `json:"allowedTopologies,omitempty" protobuf:"bytes,8,rep,name=allowedTopologies"    `
vs:

staging/src/k8s.io/api/core/v1/types.go:
3469 // A topology selector term represents the result of label queries.
3470 // A null or empty topology selector term matches no objects.
3471 // The requirements of them are ANDed.
3472 // It provides a subset of functionality as NodeSelectorTerm.
3473 // This is an alpha feature and may change in the future.
3474 // +structType=atomic
3475 type TopologySelectorTerm struct {
@msau42 @jsafrane - can you spend a moment thinking about this?

I see two paths:

Loosen validation in the "usual" way: add an alpha gate, tolerate the value in 33, move the gate to beta or even GA in 34.

Fix validation to fail on empty terms with a proper error, document it.

@msau42 @jsafrane - can you spend a moment thinking about this? Thanks.

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/lifecycle stale

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/lifecycle rotten

thockin · 2025-07-01T15:45:59Z

@msau42 @jsafrane - anyone who can opine on this PR? open for 8 months now :(

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mmorel-35 mentioned this pull request Oct 3, 2024

fix: apply makezero linter with golangci strict and hints #127839

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proposal: x/tools/go/analysis/passes/appends: check for incorrect slice length initialization golang/go#69872

Open

fix: fix slice init length

6d853da

Signed-off-by: huochexizhan <[email protected]>

huochexizhan force-pushed the master branch from 225fbcf to 6d853da Compare November 19, 2024 04:39

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fix: fix slice init length #127785

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fix: fix slice init length #127785

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huochexizhan commented Oct 1, 2024

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