Gateway API: Fix for Listener/Route hostname isolation

[sunjayBhatia]

Requests should be "isolated" to the most specific Listener and it's attached routes. This means our existing logic on finding intersecting route and Listener hostnames needs an update to factor in the other Listeners on a Gateway that the route in question may not actually be attached to.

Fix for conformance test: https://github.com/kubernetes-sigs/gateway-api/pull/2669

https://github.com/kubernetes-sigs/gateway-api/pull/2465 for spec

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.62%. Comparing base (7530c06) to head (7573ae4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6162      +/-   ##
==========================================
+ Coverage   81.60%   81.62%   +0.01%     
==========================================
  Files         133      133              
  Lines       15842    15857      +15     
==========================================
+ Hits        12928    12943      +15     
  Misses       2620     2620              
  Partials      294      294              

Files	Coverage Δ
internal/dag/gatewayapi_processor.go	93.28% <100.00%> (+0.07%)	:arrow_up:

[sunjayBhatia]

Just a rough implementation whipped up, might need some improvements but for now we have something that works with the existing structure

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[skriss]

I think this impl makes sense? Is it passing the latest version of the upstream conformance (https://github.com/kubernetes-sigs/gateway-api/pull/3047)?

[sunjayBhatia]

I think this impl makes sense? Is it passing the latest version of the upstream conformance (kubernetes-sigs/gateway-api#3047)?

it was before that PR got recreated, I'll rebase etc. on the version bump PR and see if it still does!

[sunjayBhatia]

I think this impl makes sense? Is it passing the latest version of the upstream conformance (kubernetes-sigs/gateway-api#3047)?

it was before that PR got recreated, I'll rebase etc. on the version bump PR and see if it still does!

passed in https://github.com/projectcontour/contour/actions/runs/8944042687/job/24570214238

[skriss]

Nice, LGTM