Remaining errors.Is for error equality checks

[redwrasse]

This PR follows up on #18510 to replace the rest of error equality/inequality checks with errors.Is, which is robust to error wrapping (https://pkg.go.dev/errors#pkg-overview).

Note I believe there are a number of cases of explicit error strings substring matching in tests for that are not covered in this PR. This PR just changes explicit err == and err != to errors.Is and !errors.Is.

@ivanvc

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @redwrasse. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[redwrasse]

@ivanvc let me know if you see any missing cases. this PR also builds on top of #18510, so we could also close that one and just work on this PR.

[redwrasse]

Seeing some package name conflicts, let me fix

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 61.70213% with 18 lines in your changes missing coverage. Please review.

Project coverage is 68.80%. Comparing base (4a11ca6) to head (799b315).
Report is 2 commits behind head on main.

❗ Current head 799b315 differs from pull request most recent head 1775d5e

Please upload reports for the commit 1775d5e to get more accurate results.

Files with missing lines	Patch %	Lines
server/etcdserver/api/v2discovery/discovery.go	0.00%	1 Missing and 1 partial ⚠️
server/etcdserver/api/v3discovery/discovery.go	0.00%	1 Missing and 1 partial ⚠️
server/etcdserver/api/v3rpc/watch.go	50.00%	1 Missing and 1 partial ⚠️
server/etcdserver/server.go	66.66%	2 Missing ⚠️
client/v3/client.go	66.66%	0 Missing and 1 partial ⚠️
client/v3/experimental/recipes/key.go	50.00%	1 Missing ⚠️
etcdctl/ctlv3/command/auth_command.go	0.00%	1 Missing ⚠️
pkg/proxy/server.go	50.00%	1 Missing ⚠️
server/etcdserver/api/rafthttp/snapshot_sender.go	0.00%	0 Missing and 1 partial ⚠️
server/etcdserver/api/v3rpc/lease.go	83.33%	0 Missing and 1 partial ⚠️
... and 4 more

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

Files with missing lines	Coverage Δ
client/v3/watch.go	93.24% <100.00%> (-1.00%)	⬇️
server/etcdserver/api/rafthttp/pipeline.go	97.40% <100.00%> (ø)
server/etcdserver/api/rafthttp/stream.go	81.58% <100.00%> (-0.24%)	⬇️
server/etcdserver/api/v3compactor/periodic.go	90.24% <100.00%> (ø)
server/etcdserver/api/v3rpc/util.go	51.61% <100.00%> (ø)
server/lease/leasehttp/http.go	64.18% <100.00%> (+2.02%)	⬆️
client/v3/client.go	84.89% <66.66%> (ø)
client/v3/experimental/recipes/key.go	75.34% <50.00%> (ø)
etcdctl/ctlv3/command/auth_command.go	0.00% <0.00%> (ø)
pkg/proxy/server.go	60.95% <50.00%> (+0.67%)	⬆️
... and 10 more

... and 19 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18551      +/-   ##
==========================================
+ Coverage   68.73%   68.80%   +0.07%     
==========================================
  Files         420      420              
  Lines       35470    35470              
==========================================
+ Hits        24381    24406      +25     
+ Misses       9668     9647      -21     
+ Partials     1421     1417       -4     

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[henrybear327]

/ok-to-test

[redwrasse]

goimports error, i'll fix it

[k8s-ci-robot]

@redwrasse: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-unit-test-386	1775d5e	link	true	/test pull-etcd-unit-test-386
pull-etcd-integration-1-cpu-amd64	1775d5e	link	true	/test pull-etcd-integration-1-cpu-amd64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[ivanvc]

Hi @redwrasse, thanks for the pull request. Due to its size and ease of review, would you be able to help us break it into multiple smaller PRs? I suggest one per module, i.e., client, contrib, etcdctl, etc...

I also suggest waiting for #18510 to be merged so you can continue working on it after we have the maintainers' approval and get it merged into main.

Thanks again, Samir.

[ivanvc]

Link to #18576

[redwrasse]

@ivanvc sounds good, I'll hold off for now and if we move forward I can help with a separate PR per-module.

[ivanvc]

@redwrasse, is it okay to assign you to our new parent issue for this? (#18576) If that's ok, you can comment /assign on that issue, and k8s-bot will assign it to you.

[redwrasse]

Closing this PR, since as discussed the remaining errors.Is changes PRs should be submitted per-module.