Set the digest_function field as part of all relevant gRPC requests

In the following PR we extended most of the REv2 *Request messages to take an explicit digest function:

https://github.com/bazelbuild/remote-apis/pull/235

This eliminates the ambiguity between digest functions that have the same hash length (e.g., MD5 and MURMUR3, SHA256 and SHA256TREE). This change extends the REv2 client in Bazel to set the digest_function field explicitly, so that the server does not need to use any heuristics to pick a digest function when processing requests.

As we are now going to call DigestUtil.getDigestFunction() far more
frequently, alter DigestUtil to precompute the value upon construction.

This change was tested by letting Bazel forward all traffic through an instance of bb_clientd that was patched up to require the use of `digest_function`.

Closes #17772.

PiperOrigin-RevId: 520074622
Change-Id: Ie92dc368c502b9bc3fddef56a5eb0a238760f673
5 files changed
tree: e95ebaa43fe973f66efa890ca92ba94ece98d256
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .bazelversion
  11. .gitattributes
  12. .gitignore
  13. AUTHORS
  14. BUILD
  15. CHANGELOG.md
  16. CODE_OF_CONDUCT.md
  17. CODEOWNERS
  18. combine_distfiles.py
  19. combine_distfiles_to_tar.sh
  20. compile.sh
  21. CONTRIBUTING.md
  22. CONTRIBUTORS
  23. distdir.bzl
  24. distdir_deps.bzl
  25. LICENSE
  26. maven_install.json
  27. MODULE.bazel
  28. README.md
  29. SECURITY.md
  30. WORKSPACE
  31. WORKSPACE.bzlmod
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