vole

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Stop repeating the index check and the history summaries

73ec800beafe53eea186fbc1cebec3306cc49da0 · Keenan Nemetz · 10d ago · parent 5d440e37

Stop repeating the index check and the history summaries

The request memo covered the repository, the open counts and the change
list, but two more reads were repeated:

- The index refresh (issue rows, filters, `#42` numbers) ran on every
  surface that shows one, and each run started by resolving the metadata
  ref. A page calls it from the header, the number lookup and its own
  view, so it now happens once per request, and the resolved commit is
  shared with the change-request read instead of being resolved twice.
- The overview walked the repository's whole history on every load:
  `shortlog` for contributors, `rev-list --count` for the code page's
  commit count, and the tree grouping for languages. Those are properties
  of a commit, and a commit id is content-addressed, so they cannot go
  stale: they are remembered by commit id in a bounded per-process cache
  that evicts oldest-first.

On the fixture (30 change requests, 30 issues) the overview drops from 19
git calls to 9 on a repeated load, the code page from 12 to 11, and every
page loses one `rev-parse` for the metadata ref.

server/web/web.go +7

@@ -79,6 +79,13 @@ type Web struct {
	79	79	// statusCache holds the last filesystem walk shown on the status page.
	80	80	statusCache statusCache
	81	81
		82	// History summaries, keyed by repository and commit. They are properties of
		83	// the commit graph, so they cannot go stale while the id stays the same; see
		84	// cache.go.
		85	commitCounts commitCache[int]
		86	commitAuthors commitCache[[]contributorView]
		87	commitLanguages commitCache[[]languageShare]
		88
	82	89	// limits bounds the authentication ceremonies; see ratelimit.go.
	83	90	limits authLimits
	84	91	}