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/codebrowser.go +1−1

@@ -117,7 +117,7 @@ func (w Web) codeShell(r http.Request, m *repo.Meta, ref, commit, active strin
	117	117	}
	118	118	if commit != "" {
	119	119	v.Latest, _ = g.Log(commit, 1)
	120		v.Count, _ = g.CountCommits(commit)
		120	v.Count, _ = w.countCommits(g, commit)
	121	121	v.Tree, v.TreeTruncated = buildFileTree(g, commit, active)
	122	122	}
	123	123	// Tags share the ref picker's target: a tag names a commit, so browsing a