vole

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A free and open-source forge that lives in your Git repo.

Read the metadata tree in one git call

5cecc6183eadab8147d11438abc64d54c4b0a78f · Keenan Nemetz · 10d ago · parent 5fce878d

Read the metadata tree in one git call

The issue and change-request loaders read the metadata tree with one
`git cat-file` per file, so a page render cost as many processes as the
branch had issues and comments. On a repository with 30 change requests
the overview paid 114 git invocations and 98 ms; the requests list paid
72 and 90 ms.

Read every listed blob through a single `cat-file --batch`. The push
validators share the same helper, so pre-receive stops paying one
process per file as well.

The metadata branch is the whole source of truth for issues and changes,
so this is the read path that grows with use. Nothing about the format or
the size limits changes: an oversized file is still refused before any of
it is allocated.

metadata/issues.go +7−6

@@ -474,10 +474,12 @@ func ValidateIssues(g *git.Repo, commit string) []string {
	474	474	if len(problems) > 0 {
	475	475	return problems
	476	476	}
	477		contents := map[string]string{}
		477	var paths, shas []string
	478	478	for _, e := range blobs {
	479	479	switch {
	480	480	case strings.HasPrefix(e.Name, IssuesDir+"/"):
		481	paths = append(paths, e.Name)
		482	shas = append(shas, e.SHA)
	481	483	case strings.HasPrefix(e.Name, RequestsDir+"/"):
	482	484	// Reserved: change requests are validated by their own code when they
	483	485	// land. Accepting the prefix now keeps the layout stable.
@@ -491,11 +493,10 @@ func ValidateIssues(g *git.Repo, commit string) []string {
	491	493	e.Name, IssuesDir, RequestsDir, ReleasesDir))
	492	494	continue
	493	495	}
	494		data, err := g.BlobBySHA(e.SHA)
	495		if err != nil {
	496		return append(problems, fmt.Sprintf("cannot read %s: %v", e.Name, err))
	497		}
	498		contents[e.Name] = string(data)
		496	}
		497	contents, err := readBlobs(g, paths, shas)
		498	if err != nil {
		499	return append(problems, err.Error())
	499	500	}
	500	501	problems = append(problems, ReleaseProblems(g, commit)...)
	501	502	if _, err := ParseIssues(contents); err != nil {