Implementation: External Processing support

[izturn]

Signed-off-by: Gang Liu [email protected]

Implementation proposal to address https://github.com/projectcontour/contour/issues/5123

[izturn]

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

[codecov[bot]]

Codecov Report

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

Project coverage is 80.75%. Comparing base (3e57486) to head (263275f). Report is 13 commits behind head on main.

Files	Patch %	Lines
internal/dag/httpproxy_processor.go	31.85%	66 Missing and 11 partials :warning:
internal/envoy/v3/listener.go	6.38%	44 Missing :warning:
internal/envoy/v3/route.go	0.00%	36 Missing and 1 partial :warning:
cmd/contour/serve.go	5.55%	17 Missing :warning:
cmd/contour/servecontext.go	11.11%	15 Missing and 1 partial :warning:
internal/xdscache/v3/listener.go	37.50%	10 Missing :warning:
internal/fixture/httpproxy.go	0.00%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5867      +/-   ##
==========================================
- Coverage   81.76%   80.75%   -1.01%     
==========================================
  Files         133      133              
  Lines       15942    16173     +231     
==========================================
+ Hits        13035    13061      +26     
- Misses       2614     2806     +192     
- Partials      293      306      +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%)	:arrow_down:
internal/xdscache/v3/listener.go	89.28% <37.50%> (-2.84%)	:arrow_down:
cmd/contour/servecontext.go	82.47% <11.11%> (-3.48%)	:arrow_down:
cmd/contour/serve.go	22.22% <5.55%> (-0.45%)	:arrow_down:
internal/envoy/v3/route.go	75.63% <0.00%> (-4.40%)	:arrow_down:
internal/envoy/v3/listener.go	90.79% <6.38%> (-7.66%)	:arrow_down:
internal/dag/httpproxy_processor.go	85.89% <31.85%> (-5.52%)	:arrow_down:

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[wilsonwu]

For common use cases, I think support route only external process is a good way to help users to config specific logic for their APIs, in my exprences, only few API need specific logic, rest of APIs are normal.

[imranismail]

Great work @izturn, this will greatly help with adopting contour as part of our stack.

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[izturn]

ping @clayton-gonsalves

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[wilsonwu]

Let's review this PR again, this feature already ran on our product for 2 months, it is stable, we'd like to comtribute to community.

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