add generic sets to utils #243

logicalhan · 2022-04-19T21:27:57Z

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

We have a sets utils in pkg in k8s/k8s. This refactors that implementation to use generics instead of code-generation and moves the library here.

Release note:

NONE

liggitt · 2022-04-20T14:24:00Z

utils now requires golang 1.18

A couple thoughts:

as long as we have supported Kubernetes release branches that use k8s.io/utils and aren't on go1.18, I would not expect us to make the minimum version go1.18... can we use go version build tags or something similar to scope these files to go1.18 while making the rest of the module consumable by earlier versions of go?
we have strict go API compatibility checks on this repo... is this the best place to start experimenting with go APIs using generics? we'll be stuck with any mistakes we're unhappy with

apelisse · 2022-04-22T15:59:58Z

as long as we have supported Kubernetes release branches that use k8s.io/utils and aren't on go1.18, I would not expect us to make the minimum version go1.18... can we use go version build tags or something similar to scope these files to go1.18 while making the rest of the module consumable by earlier versions of go?

Agreed, if we can have some form of conditional compilation and isolate the packages that require go1.18, that'd be nice. Otherwise, we could also branch into a requires-1.18 vs no-1.18. In case we have to make a patch to an older version, we could apply it to the no-1.18 and merge that change back into the 1.18 branch, the process is a little more involved. We can also put that process in place lazily when/if we eventually need it. How often have we needed to patch utils in a minor release?

we have strict go API compatibility checks on this repo... is this the best place to start experimenting with go APIs using generics? we'll be stuck with any mistakes we're unhappy with

The thing is that yeah, utils are usually the best place to start using generics :-(

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k8s-ci-robot · 2022-09-19T18:14:36Z

@k8s-triage-robot: Closed this PR.

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thockin · 2022-11-08T00:47:54Z

We let this age-out. When do we bring it back?

logicalhan · 2022-11-08T16:57:26Z

/reopen

We let this age-out. When do we bring it back?

1.27 (so next release)

k8s-ci-robot · 2022-11-08T16:57:32Z

@logicalhan: Reopened this PR.

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/reopen

We let this age-out. When do we bring it back?

1.27 (so next release)

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logicalhan · 2022-11-08T16:58:03Z

/lifecycle frozen

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logicalhan · 2022-11-08T16:58:18Z

/remove-lifecycle rotten

logicalhan · 2022-11-08T19:29:26Z

/close

k8s-ci-robot · 2022-11-08T19:29:36Z

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skitt · 2023-04-27T13:59:15Z

sets/set.go

+
+import "sort"
+
+type Ordered interface {


The apimachinery implementation uses comparable instead (which requires Go 1.20 to work properly).

sets/set.go

thockin · 2023-04-27T18:00:15Z

The doc on comparable is ... tricky to digest.

skitt · 2023-04-27T19:06:38Z

The doc on comparable is ... tricky to digest.

That’s putting it mildly! But I think it’s the right approach in this case (assuming a Go 1.20 bump is acceptable).

thockin · 2023-04-27T19:51:47Z

I'm trying to digest why it's OK to runtime-panic on any and how to apply the dirty trick at the end of the doc

thockin · 2023-04-27T20:08:18Z

Like: https://go.dev/play/p/vBEo5hg2mnu

It seems BETTER in 1.19 than 1.20

thockin · 2023-04-27T20:19:34Z

sets/set.go

+limitations under the License.
+*/
+
+package sets


Since we're nitpicking, why not set - set.Set[int] or even set.S[int] ?

Or should this be containers.Set[int] or something? stl.Set[int] ? :)

I renamed the package to set.

logicalhan · 2023-05-05T19:31:48Z

So basically my plan is twofold:

(1) introduce sets using ordered type so that we can have set.SortedList
(2) once we can bump utils to golang 1.20, then I will introduce a set[comparable] which has the exact API as set[ordered] without the SortedList method. Then I will create an API compatible version of set[ordered] which delegates all calls underneath to set[comparable] and then implement SortedList on set[ordered].

thockin

nits

sets/set.go

set/ordered.go

set/set.go

set/set_test.go

thockin

Thanks!

/lgtm
/approve

k8s-ci-robot · 2023-05-05T20:15:19Z

[APPROVALNOTIFIER] This PR is APPROVED

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

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pohly · 2023-05-15T07:05:36Z

once we can bump utils to golang 1.20, then I will introduce a set[comparable] which has the exact API as set[ordered] without the SortedList method. Then I will create an API compatible version of set[ordered] which delegates all calls underneath to set[comparable] and then implement SortedList on set[ordered].

Is there an issue open for tracking that? Do you already have a prototype?

Following kubernetes/utils#243 it's likely that the k8s.io/utils version will end up being the canonical one. Signed-off-by: Stephen Kitt <[email protected]>

k8s-ci-robot requested review from andrewsykim and apelisse April 19, 2022 21:28

k8s-ci-robot added the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Jul 21, 2022

liggitt mentioned this pull request Jul 28, 2022

Add generics policy for kubernetes kubernetes/community#6693

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skitt reviewed Apr 27, 2023

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thockin reviewed Apr 27, 2023

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thockin mentioned this pull request May 3, 2023

rethink sets.List() / sets.Set.UnsortedList() naming? kubernetes/kubernetes#117673

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make this implementation of sets compatible with the one in apimachinery

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k8s-ci-robot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels May 5, 2023

logicalhan force-pushed the generics branch from 2a8b9a2 to 4754579 Compare May 5, 2023 19:34

fix lint issue

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logicalhan force-pushed the generics branch from 4754579 to c3703b2 Compare May 5, 2023 19:37

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address tim's comments

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liggitt mentioned this pull request May 10, 2023

add generic methods for integer package #280

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This was referenced Jun 21, 2023

x/exp/apidiff: incorrect behaviour with user defined type constraints golang/go#60911

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Broken CI job: apidiff #284

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Revert "add generic sets to utils" #285

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skitt mentioned this pull request Jul 4, 2023

Use k8s.io/utils set instead of apimachinery sets operator-framework/operator-sdk#6486

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add generic sets to utils #243

add generic sets to utils #243

logicalhan commented Apr 19, 2022 •

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add generic sets to utils #243

add generic sets to utils #243

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