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digest: Add AsRef<str> #229

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merged 1 commit into from
Oct 8, 2024
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@cgwalters cgwalters commented Sep 23, 2024

Conceptually Digest() is just a parsed string wrapper. Many cases want to get access to the full value without allocating, and the introduction of the type was a regression from that point of view in 0.7.

Luckily, we can change our internals in such a way that it's safe to add the impl. Do that by holding onto the full value, with a duplicate small boxed str for the algorithm only in the degenerate case that it's an unknown type.

If we had this it would have made containers/bootc#800 less likely.

What type of PR is this?

/kind feature

What this PR does / why we need it:

See commit message

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

- Digest can now cheaply be viewed as a `&str` via `.as_ref()`

Conceptually `Digest()` is just a parsed string wrapper. Many
cases want to get access to the full value without allocating,
and the introduction of the type was a regression from that point of
view in 0.7.

Luckily, we can change our internals in such a way that it's
safe to add the impl. Do that by holding onto the full value,
with a duplicate small boxed str for the algorithm only in
the degenerate case that it's an unknown type.

If we had this it would have made containers/bootc#800
less likely.

Signed-off-by: Colin Walters <[email protected]>
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.77%. Comparing base (57570dd) to head (8aa75aa).
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Additional details and impacted files
@@             Coverage Diff             @@
##             main     #229       +/-   ##
===========================================
+ Coverage   26.61%   70.77%   +44.15%     
===========================================
  Files          24       26        +2     
  Lines        2788     3168      +380     
  Branches     1516     1673      +157     
===========================================
+ Hits          742     2242     +1500     
+ Misses        948      926       -22     
+ Partials     1098        0     -1098     

@utam0k utam0k merged commit 2e07cf1 into youki-dev:main Oct 8, 2024
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4 participants