Adds GatewayClass Status Support

[danehans]

• Adds Status pkg for managing status of supported resources.
• Updates gatewayclass controller to set the status of managed gatewayclasses.

Fixes #147

Signed-off-by: danehans daneyonhansen@gmail.com

[codecov-commenter]

Codecov Report

Merging #150 (f481318) into main (ebca0a7) will decrease coverage by 1.58%.
The diff coverage is 47.59%.

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
- Coverage   53.08%   51.50%   -1.59%     
==========================================
  Files          12       15       +3     
  Lines         486      666     +180     
==========================================
+ Hits          258      343      +85     
- Misses        210      299      +89     
- Partials       18       24       +6     

Impacted Files	Coverage Δ
internal/status/gatewayclass.go	0.00% <0.00%> (ø)
internal/status/status.go	3.12% <3.12%> (ø)
pkg/provider/kubernetes/gatewayclass.go	63.96% <57.74%> (-8.38%)	⬇️
internal/status/conditions.go	93.87% <93.87%> (ø)

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[arkodg]

thanks for adding this, the status controller can be made a stand alone entity in a follow up PR using #147

[youngnick]

This LGTM with one future request about ObservedGeneration - it's critical for Condition consumers to be able to be sure they're seeing the correct version of the status.

[youngnick]

We should probably have a TODO here to pass the Generation as well, so we can set ObservedGeneration. Not blocking for this PR though.

[skriss]

Code LGTM. My one comment is that as we're reusing code from other projects (which I'm in favor of BTW), we should make sure we're doing some attribution/not falling afoul of licensing requirements by reusing that work. I'm not sure what the best approach to doing this is, since I expect we'll all be doing a fair amount of reuse -- perhaps we can add some documentation at the repo level indicating the projects that we're reusing code from and including whatever license info is required, rather than doing it on a file-by-file basis.

[danehans]

@skriss @youngnick commit f481318 adds the Contour license header to src files lifted from Contour, PTAL.

[skriss]

@danehans my hope is that we can do something like #92 (comment) to avoid needing to do this per file, but until we resolve that, I think what you have works. The one other thing I would add is for any files that were not copied verbatim, adding some text indicating they've been modified from the original to satisfy https://github.com/envoyproxy/gateway/blob/main/LICENSE#L97-L98.

[danehans]

@skriss @youngnick I've updated the relevant src files with a Contour attribution. I think this is acceptable until #92 (comment) is resolved, PTAL.

[skriss]

LGTM pending a little merge conflict.