feat: added first draft of replacement between delimiter #5617

Yingrjimsch · 2024-03-18T11:36:12Z

linux-foundation-easycla · 2024-03-18T11:36:16Z

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✅ login: Yingrjimsch (45f492a, 255e8d2, 4210131, f4441a8)

k8s-ci-robot · 2024-03-18T11:36:21Z

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k8s-ci-robot · 2024-03-18T11:36:22Z

Hi @Yingrjimsch. Thanks for your PR.

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k8s-ci-robot · 2024-03-21T09:26:44Z

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Yingrjimsch · 2024-03-21T09:53:27Z

Edit: I decided to add a fulltext replacement as well because it was very similar to the start and enddelimiter. Should not be too much to review and is pretty straightforward.

Yingrjimsch · 2024-03-21T10:02:55Z

/assign @ncapps

Yingrjimsch · 2024-03-26T09:02:32Z

/assign @varshaprasad96

olegmayko · 2024-04-10T08:47:58Z

hi, any ETA on the merge of this PR?

Yingrjimsch · 2024-04-10T08:55:56Z

hi, any ETA on the merge of this PR?

I tried via Slack and Assigning to find someone but until now I got sadly no reaction...

olegmayko · 2024-04-10T08:59:50Z

hi, any ETA on the merge of this PR?

I tried via Slack and Assigning to find someone but until now I got sadly no reaction...

Hi @Yingrjimsch thanks for your contribution, I have been checked how to migrate from vars to replacement recently and found it's not possible for our setup until this or similar feature is available. it's strange that there is not so much noise about this , but maybe noone have tried to migrate yet.

harshsingh32

lgtm

newtondev · 2024-05-15T11:33:51Z

This is a great feature and would love to start using it (kudos for implementing it). There any reviewers that can approve?

antoooks · 2024-06-20T17:10:23Z

/ok-to-test

varshaprasad96 · 2024-06-20T20:01:16Z

api/filters/replacement/replacement.go

+		if options.Delimiter == "" {
+			return nil, fmt.Errorf("delimiter needs to be set if enddelimiter is set")
+		}
+		re := regexp.MustCompile(regexp.QuoteMeta(options.Delimiter) + `(.*?)` + regexp.QuoteMeta(options.EndDelimiter))


This seems to be a bit fragile:

We assume that delimiter and end delimiter are in pairs, but this may not be the case always.

Also what happens when delimiters are not in expected order, or there are nested delimiters.

If not for nested delimiters, for the other cases, can we do any kind of pre-processing?

@varshaprasad96 thank you for the feedback.

The option is that Delimiter comes alone, in this case it stays like it is today, the EndDelimiter should not be used without a Delimiter if so we return an error and if they are used in combination, the value in between them is loaded. If I'm not mistaken all cases should be handled.

The delimiters should always be in expected order because their key (delimiter or enddelimiter) allow us to define the order.

To make it less fragile we could do a preprocessing, if the EndDelimiter is set and the Delimiter is empty they swap values. Do you have another suggestion for preprocessing?

The option is that Delimiter comes alone, in this case it stays like it is today, the EndDelimiter should not be used without a Delimiter if so we return an error and if they are used in combination, the value in between them is loaded. If I'm not mistaken all cases should be handled.

It looks like we do have a check for that. But what happens when there are unequal number of delimiters and end-delimiters? The regex would still compile, but I'm wondering that there would be some unexpected behaviours? Which is why would it be better if we count for each of those occurrences to ensure they work appear as pairs?

To make it less fragile we could do a preprocessing, if the EndDelimiter is set and the Delimiter is empty they swap values. Do you have another suggestion for preprocessing?

I think this looks good the way it is for now, where we error out if delimiter is not set when end delimiter is.

The delimiters should always be in expected order because their key (delimiter or enddelimiter) allow us to define the order.

Can we have checks to ensure that they are in the order as expected, especially when there is a nested scenario - where we have multiple of delimiters and enddelimiters?

@varshaprasad96 I will look into this this week and give you a feedback. If I see a possibility to ensure the order and the amount of delimiters I would implement it so you can review it.

Hi @varshaprasad96 I've looked into it and wanted to ask if you could provide a nested example for me. As I have seen the delimiters are used in FieldOptions https://github.com/kubernetes-sigs/kustomize/blob/master/api/types/replacement.go#L67 which consists of primitive datatypes variables, therefore I don't see how multiple delimiters or nesting could accure. The replacement consists of one SourceSelector and multiple TargetSelector everyone of these types contain exactly one FieldOptions type.

If I am missing something just tell me and I will look into it.

varshaprasad96 · 2024-06-20T20:13:11Z

api/filters/replacement/replacement.go

+	return strings.Join(tv, delimiter)
+}
+
+func getByRegex(regex string, target string, source string, index int) string {


Since both these are fragile string manipulation methods, can we have separate tests to verify these and ensure we are capturing the edge cases?

@varshaprasad96 I've written some edge case tests but if you want I can add some tests that handle these functions in specific

EDIT: I've added some tests for the regex function. I hope this is what you imagined. Let me know if you want/need more tests

k8s-ci-robot · 2024-06-21T07:57:02Z

[APPROVALNOTIFIER] This PR is NOT APPROVED

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koba1t · 2024-06-30T18:43:55Z

/hold
Sorry, but I add a comment to the feature request issue.

k8s-triage-robot · 2024-09-28T18:56:23Z

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k8s-ci-robot requested review from ncapps and varshaprasad96 March 18, 2024 11:36

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Yingrjimsch added 2 commits March 21, 2024 10:30

feat: added first draft of replacement between delimiter

45f492a

fix: added full string replacement

4210131

Yingrjimsch force-pushed the feat/replace-between-delimiters branch from 758a50c to 4210131 Compare March 21, 2024 09:33

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harshsingh32 reviewed May 5, 2024

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Yingrjimsch requested a review from harshsingh32 June 20, 2024 06:06

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fix: added edge case tests for regex and reject for source

f4441a8

Yingrjimsch force-pushed the feat/replace-between-delimiters branch from fbd7efe to f4441a8 Compare June 21, 2024 07:59

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chore: fix simple bug

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feat: added first draft of replacement between delimiter #5617

feat: added first draft of replacement between delimiter #5617

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