internal/proxy: cache info and mod endpoints

Add more caching to the proxy client so we can call Info and Mod
multiple times during a fetch without worrying about wasted RPCs to
the proxy.

This will enable moving the load shedder, which requires its own info
call, out of the fetch logic and into the worker.

For golang/go#48010

Change-Id: I4e875b1fd5b968aae174cfb93f4cf3a9a2b7a577
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/346729
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
5 files changed
tree: 02e09790528b5da3c209f44b88a9d7a9be768aeb
  1. cmd/
  2. devtools/
  3. doc/
  4. internal/
  5. migrations/
  6. static/
  7. tests/
  8. third_party/
  9. .dockerignore
  10. .eslintignore
  11. .eslintrc.yaml
  12. .gitignore
  13. .prettierignore
  14. .prettierrc.yaml
  15. .stylelintignore
  16. .stylelintrc.yaml
  17. all.bash
  18. cloudbuild.yaml
  19. CONTRIBUTING.md
  20. go.mod
  21. go.sum
  22. jest.config.js
  23. LICENSE
  24. package-lock.json
  25. package.json
  26. PATENTS
  27. README.md
  28. tsconfig.json
README.md

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