Implementation: External Processing support

[izturn]

Signed-off-by: Gang Liu gang.liu@daocloud.io

Implementation proposal to address #5123

[izturn]

Due to the current proposal status, relevant unit tests have not been added yet

[codecov]

Codecov Report

Attention: Patch coverage is 18.97233% with 205 lines in your changes are missing coverage. Please review.

Project coverage is 80.61%. Comparing base (6558591) to head (8a321c1).
Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5867      +/-   ##
==========================================
- Coverage   81.62%   80.61%   -1.02%     
==========================================
  Files         133      133              
  Lines       15852    16083     +231     
==========================================
+ Hits        12939    12965      +26     
- Misses       2619     2811     +192     
- Partials      294      307      +13     

Files	Coverage Δ
internal/dag/dag.go	98.44% <ø> (ø)
internal/sorter/sorter.go	100.00% <ø> (ø)
pkg/config/parameters.go	88.03% <ø> (ø)
internal/fixture/httpproxy.go	82.92% <0.00%> (-8.97%)	⬇️
internal/xdscache/v3/listener.go	89.14% <37.50%> (-2.87%)	⬇️
cmd/contour/servecontext.go	82.47% <11.11%> (-3.48%)	⬇️
cmd/contour/serve.go	22.22% <5.55%> (-0.45%)	⬇️
internal/envoy/v3/route.go	75.44% <0.00%> (-4.43%)	⬇️
internal/envoy/v3/listener.go	90.79% <6.38%> (-7.66%)	⬇️
internal/dag/httpproxy_processor.go	85.89% <31.85%> (-5.52%)	⬇️

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[clayton-gonsalves]

Suggested change

	type GRPCService struct {
	type ExtProcServer struct {

keeps it uniform with AuthorizationServer

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[izturn]

ping @clayton-gonsalves

[github-actions]

The Contour project currently lacks enough contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 14d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, the PR is closed

You can:

• Ensure your PR is passing all CI checks. PRs that are fully green are more likely to be reviewed. If you are having trouble with CI checks, reach out to the #contour channel in the Kubernetes Slack workspace.
• Mark this PR as fresh by commenting or pushing a commit
• Close this PR
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Please send feedback to the #contour channel in the Kubernetes Slack