internal/frontend: get list of vuln entries concurrently

Read all the vuln DB entries concurrently.

We arbitrarily set the number of concurrent requests to 4. It's very
difficult to benchmark because after the first run, the data is cached
somewhere outside the program (local machine buffers or perhaps a CDN)
so subsequent calls are fast. But the first run took about 8 seconds
sequentially, so this should reduce it to about 2 seconds, which is
fine.

Fixes golang/go#49451

Change-Id: I6e5f0abc6cd1958e9248786ceeeb7898d6efa1c3
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/364975
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
2 files changed
tree: c1ea064865c45c89f92bdbf62d2951c25ef07849
  1. cmd/
  2. deploy/
  3. devtools/
  4. doc/
  5. internal/
  6. migrations/
  7. static/
  8. tests/
  9. third_party/
  10. .dockerignore
  11. .eslintignore
  12. .eslintrc.yaml
  13. .gitignore
  14. .prettierignore
  15. .prettierrc.yaml
  16. .stylelintignore
  17. .stylelintrc.yaml
  18. all.bash
  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
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