🐛 Fakeclient: Fix dataraces when writing to the scheme

[alvaroaleman]

We have a scheme write lock but plenty of other codeptaths that read from the scheme and that don't do looking, resulting in dataraces if the two happen in parallel.

This change introduces a simple RW lock and makes the fakeclient acquire read locking for all its operations except when needing the write lock. This isn't particularly smart, but given that we only have one codepath that writes to the scheme, it seems good enough.

Fixes #3139

/cherrypick release-0.20
/cherrypick release-0.19

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [alvaroaleman]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[sbueringer]

Thx!
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 32a098181f281b40bfcfa2ca949e6d4bdd74470c

[k8s-infra-cherrypick-robot]

@alvaroaleman: new pull request created: #3145

In response to this:

We have a scheme write lock but plenty of other codeptaths that read from the scheme and that don't do looking, resulting in dataraces if the two happen in parallel.

This change introduces a simple RW lock and makes the fakeclient acquire read locking for all its operations except when needing the write lock. This isn't particularly smart, but given that we only have one codepath that writes to the scheme, it seems good enough.

Fixes #3139

/cherrypick release-0.20
/cherrypick release-0.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-infra-cherrypick-robot]

@alvaroaleman: new pull request created: #3146

In response to this:

We have a scheme write lock but plenty of other codeptaths that read from the scheme and that don't do looking, resulting in dataraces if the two happen in parallel.

This change introduces a simple RW lock and makes the fakeclient acquire read locking for all its operations except when needing the write lock. This isn't particularly smart, but given that we only have one codepath that writes to the scheme, it seems good enough.

Fixes #3139

/cherrypick release-0.20
/cherrypick release-0.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.