Fix defaulter-gen for recursive types by nikhita · Pull Request #61 · kubernetes/gengo

nikhita · 2017-06-09T17:26:51Z

For recursive types, the defaulter currently goes into an infinite recursion.
Fix to support recursive types.

k8s-reviewable · 2017-06-09T17:26:57Z

This change is

nikhita · 2017-06-09T17:27:23Z

examples/defaulter-gen/generators/defaulter.go

 					continue
 				}
-				if buildCallTreeForType(t, true, existingDefaulters, newDefaulters) != nil {
+				existingTypes := make(map[string]bool)


PTAL if this is the right way to do it.

sttts · 2017-06-09T17:30:16Z

examples/defaulter-gen/generators/defaulter.go

 // this function skips adding that defaulter - this allows us to avoid generating object defaulter functions for
 // list types that call empty defaulters.
-func buildCallTreeForType(t *types.Type, root bool, existingDefaulters, newDefaulters defaulterFuncMap) *callNode {
+func buildCallTreeForType(t *types.Type, root bool, existingDefaulters, newDefaulters defaulterFuncMap, existingTypes map[string]bool) *callNode {


Can you document existingTypes? Is it feasible to have a recursive type in some test? Are there tests here in the generator?

Will document it.
Currently there are no tests. But I'll add one.

sttts · 2017-06-09T17:31:12Z

examples/defaulter-gen/generators/defaulter.go

+		return parent
+	}
+	// if type doesn't exist, mark it as existing
+	existingTypes[t.Name.Name] = true


shouldn't we check that Name is actually files, i.e. not an anonymous type? Otherwise, we stop too early for those, don't we?

So I should check for t.Name?

If I read the type godoc correctly, Name can be empty.

sttts · 2017-06-09T17:35:39Z

Can you link a commit for the Kubernetes defaulters? Do they change after this PR?

thockin · 2017-06-10T19:15:33Z

This could really use output tests like https://github.com/kubernetes/gengo/tree/master/examples/deepcopy-gen/output_tests

nikhita · 2017-06-11T21:48:09Z

Updated the defaulter code. PTAL.

I have added some tests. However, I come across the following error when I run make: https://gist.github.com/nikhita/379c3789b8049038109b1ea1509b483b. What could be the possible reason for this error?

It works when there is no defaults.go file though. I have also pushed the file generated in this case.

After making the changes in this PR and fixing the conversion in kubernetes/kubernetes#47263, nothing breaks/changes in Kubernetes (tested against HEAD). This PR shows the cumulative changes in both the defaulter and converter: nikhita/kubernetes#3.

nikhita · 2017-06-11T21:52:36Z

examples/defaulter-gen/output_tests/builtins/defaults.go

@@ -0,0 +1,36 @@
+/*
+Copyright 2016 The Kubernetes Authors.


Oops, will fix the year after the review.

nikhita · 2017-06-12T08:55:56Z

The tests are being added in #55. Will create a PR to add a test for recursive types on top of #55.

nikhita · 2017-06-12T12:32:40Z

Added tests on top of #55 here: caesarxuchao#1.

sttts · 2017-06-12T13:15:34Z

lgtm.

@thockin ptal at https://github.com/caesarxuchao/gengo/pull/1/files for example output.

sttts · 2017-07-03T15:10:44Z

examples/defaulter-gen/generators/defaulter.go

-				if buildCallTreeForType(t, true, existingDefaulters, newDefaulters) != nil {
+				// existingTypes keeps track of types that have already been visited in the tree.
+				// This is used to avoid recursion for recursive types.
+				existingTypes := make(map[*types.Type]bool)


s/existingTypes/alreadyVisitedTypes/

sttts · 2017-07-03T15:19:10Z

@wojtek-t can this go in? (you are in the OWNERs files, together with @lavalamp. Though the merge+review policy here is unclear to me looking at previous PRs).

lavalamp · 2017-07-05T22:08:53Z

examples/defaulter-gen/generators/defaulter.go

+
+	// The type now acts as a parent, not a nested recursive type.
+	// We can now build the tree for it safely.
+	alreadyVisitedTypes[t] = false


The name is wrong if you set it to false after you are done. Should be "currentlyBuildingTypes" or "typesInProgress" or something.

lavalamp · 2017-07-05T22:10:00Z

examples/defaulter-gen/generators/defaulter.go

 // this function skips adding that defaulter - this allows us to avoid generating object defaulter functions for
 // list types that call empty defaulters.
-func buildCallTreeForType(t *types.Type, root bool, existingDefaulters, newDefaulters defaulterFuncMap) *callNode {
+func buildCallTreeForType(t *types.Type, root bool, existingDefaulters, newDefaulters defaulterFuncMap, alreadyVisitedTypes map[*types.Type]bool) *callNode {


Consider making a struct to hold all of the parameters that don't change, and make this function a method on that struct. Will make the code a lot easier to read.

lavalamp · 2017-07-05T22:11:11Z

(happy to lgtm & merge after those comments are addressed)

nikhita · 2017-07-06T13:02:47Z

@lavalamp Updated.

lavalamp

Sorry for not being clear but that wasn't quite what I had in mind.

lavalamp · 2017-07-06T16:58:48Z

examples/defaulter-gen/generators/defaulter.go


+// callTreeForType contains fields necessary to call buildCallTreeForType.
+type callTreeForType struct {
+	t                      *types.Type


remove; this struct should have only the immutable parameters.

lavalamp · 2017-07-06T16:59:02Z

examples/defaulter-gen/generators/defaulter.go

+// callTreeForType contains fields necessary to call buildCallTreeForType.
+type callTreeForType struct {
+	t                      *types.Type
+	root                   bool


remove; this struct should have only the immutable parameters.

lavalamp · 2017-07-06T16:59:16Z

examples/defaulter-gen/generators/defaulter.go

+	currentlyBuildingTypes map[*types.Type]bool
+}
+
+func NewCallTreeForType(t *types.Type, root bool, existingDefaulters, newDefaulters defaulterFuncMap, currentlyBuildingTypes map[*types.Type]bool) callTreeForType {


Delete this or change to:

func NewCallTreeForType(existingDefaulters, newDefaulters defaulterFuncMap) *callTreeForType { return &callTreeForType{ existingDefaulters: existingDefaulters, newDefaulters: newDefaulters, currentlyBuildingTypes: make(map[*types.Type]bool), } }

We can't initialize currentlyBuildingTypes in newCallTreeForType because when this is encountered:

r := newCallTreeForType(c.existingDefaulters, c.newDefaulters) if child := r.build(t.Elem, false); child != nil

it will create a new map for currentlyBuildingTypes - destroying our purpose for storing the types that are currently building. :)

lavalamp · 2017-07-06T17:05:40Z

examples/defaulter-gen/generators/defaulter.go

 	case types.Pointer:
-		if child := buildCallTreeForType(t.Elem, false, existingDefaulters, newDefaulters); child != nil {
+		r := NewCallTreeForType(c.t.Elem, false, c.existingDefaulters, c.newDefaulters, c.currentlyBuildingTypes)
+		if child := r.buildCallTreeForType(); child != nil {


All of these should look like if child := r.Build(c.t.Elem, false); child != nil {

lavalamp · 2017-07-06T17:05:52Z

examples/defaulter-gen/generators/defaulter.go

 // this function skips adding that defaulter - this allows us to avoid generating object defaulter functions for
 // list types that call empty defaulters.
-func buildCallTreeForType(t *types.Type, root bool, existingDefaulters, newDefaulters defaulterFuncMap) *callNode {
+func (c callTreeForType) buildCallTreeForType() *callNode {


func (c *callTreeForType) Build(t *types.Type, root bool) *callNode {

lavalamp · 2017-07-06T17:06:00Z

examples/defaulter-gen/generators/defaulter.go

+				// This is used to avoid recursion for recursive types.
+				currentlyBuildingTypes := make(map[*types.Type]bool)
+				c := NewCallTreeForType(t, true, existingDefaulters, newDefaulters, currentlyBuildingTypes)
+				if c.buildCallTreeForType() != nil {


This should be a one-liner:

if NewCallTreeForType(existingDefaulters, newDefaulters).Build(t, true) != nil {

lavalamp · 2017-07-06T17:07:51Z

examples/defaulter-gen/generators/defaulter.go

+	currentlyBuildingTypes map[*types.Type]bool
+}
+
+func NewCallTreeForType(t *types.Type, root bool, existingDefaulters, newDefaulters defaulterFuncMap, currentlyBuildingTypes map[*types.Type]bool) callTreeForType {


Actually both this and Build should be private.

nikhita · 2017-07-06T21:23:43Z

@lavalamp Updated. PTAL, thanks.

lavalamp · 2017-07-06T21:26:46Z

examples/defaulter-gen/generators/defaulter.go

 	switch t.Kind {
 	case types.Pointer:
-		if child := buildCallTreeForType(t.Elem, false, existingDefaulters, newDefaulters); child != nil {
+		r := newCallTreeForType(c.existingDefaulters, c.newDefaulters, c.currentlyBuildingTypes)


What I was trying to communicate is that you don't call newCallTreeForType here, you reuse c.

I think I wrote an r where I meant a c--sorry about that.

Right, sorry - should have done this in the first place.

Updated. Please check if this is better.

lavalamp · 2017-07-06T22:47:06Z

examples/defaulter-gen/generators/defaulter.go

+
+	// The type now acts as a parent, not a nested recursive type.
+	// We can now build the tree for it safely.
+	c.currentlyBuildingTypes[t] = false


Looking good--last question, should this be in a defer block? The return on line 496 skips it, for example.

Rename Address comments Address further comments Use defer

lavalamp · 2017-07-06T23:38:53Z

LGTM, thanks for bearing with me :)

@sttts

Automatic merge from submit-queue apiextensions: validation for customresources - [x] Add types for validation of CustomResources - [x] Fix conversion-gen: #49747 - [x] Fix defaulter-gen: kubernetes/gengo#61 - [x] Convert to OpenAPI types - [x] Validate CR using go-openapi - [x] Validate CRD Schema - [x] Add integration tests - [x] Fix round trip tests: #51204 - [x] Add custom fuzzer functions - [x] Add custom conversion functions - [x] Fix data race while updating CRD: #50098 - [x] Add feature gate for CustomResourceValidation - [x] Fix protobuf generation Proposal: kubernetes/community#708 Additional discussion: #49879, #50625 **Release note**: ```release-note Add validation for CustomResources via JSON Schema. ``` /cc @sttts @deads2k

@sttts

Automatic merge from submit-queue apiextensions: validation for customresources - [x] Add types for validation of CustomResources - [x] Fix conversion-gen: #49747 - [x] Fix defaulter-gen: kubernetes/gengo#61 - [x] Convert to OpenAPI types - [x] Validate CR using go-openapi - [x] Validate CRD Schema - [x] Add integration tests - [x] Fix round trip tests: #51204 - [x] Add custom fuzzer functions - [x] Add custom conversion functions - [x] Fix data race while updating CRD: #50098 - [x] Add feature gate for CustomResourceValidation - [x] Fix protobuf generation Proposal: kubernetes/community#708 Additional discussion: kubernetes/kubernetes#49879, kubernetes/kubernetes#50625 **Release note**: ```release-note Add validation for CustomResources via JSON Schema. ``` /cc @sttts @deads2k Kubernetes-commit: 4457e43e7b789586096bfb564330295cf0438e70

k8s-ci-robot requested a review from sttts June 9, 2017 17:26

k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Jun 9, 2017

nikhita commented Jun 9, 2017

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nikhita mentioned this pull request Jun 9, 2017

apiextensions: validation for customresources kubernetes/kubernetes#47263

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nikhita changed the title ~~Fix defaulter for recursive types~~ [WIP] Fix defaulter for recursive types Jun 9, 2017

nikhita mentioned this pull request Jun 10, 2017

validation: fix code generation for recursive types nikhita/gsoc-meta-k8s#19

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nikhita force-pushed the fix-recursive-types branch from 331e754 to ba7ac3b Compare June 11, 2017 21:14

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nikhita force-pushed the fix-recursive-types branch from 9929cff to ba7ac3b Compare June 12, 2017 08:35

nikhita changed the title ~~[WIP] Fix defaulter for recursive types~~ Fix defaulter-gen for recursive types Jun 12, 2017

nikhita mentioned this pull request Jun 12, 2017

Add tests for recursive types in defaulter-gen caesarxuchao/gengo#1

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sttts reviewed Jul 3, 2017

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nikhita force-pushed the fix-recursive-types branch from ba7ac3b to 5f0312b Compare July 3, 2017 15:27

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nikhita force-pushed the fix-recursive-types branch from 5f0312b to ce68359 Compare July 6, 2017 12:48

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nikhita force-pushed the fix-recursive-types branch from ce68359 to 644e318 Compare July 6, 2017 21:21

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nikhita force-pushed the fix-recursive-types branch from 644e318 to 9a0932b Compare July 6, 2017 21:38

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Fix defaulter for nested recursive types

96fe5d0

Rename Address comments Address further comments Use defer

nikhita force-pushed the fix-recursive-types branch from 9a0932b to 96fe5d0 Compare July 6, 2017 23:15

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lavalamp merged commit d354881 into kubernetes:master Jul 6, 2017

nikhita deleted the fix-recursive-types branch July 6, 2017 23:39

nikhita restored the fix-recursive-types branch July 7, 2017 07:32

nikhita mentioned this pull request Jul 7, 2017

update vendored gengo kubernetes/kubernetes#48630

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