vole

Clone

Read only, no credentials:

https://rodent.software/vole.git

Write over SSH with a registered key:

git clone ssh://git@rodent.software:2222/vole.git

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

Record the default branch summary when a push lands

8dc56e4e258dd56e2c20776f80d61dbed4993f31 · Keenan Nemetz · 10d ago · parent 20442b59

Record the default branch summary when a push lands

The landing card showed the default branch tip and the language it is
mostly made of by running `symbolic-ref`, `rev-parse`, `log -1` and
`ls-tree -r` per repository on every home page read. Those facts change
only when a push moves the branch, so the push now records them.

- `repos` carries head_sha, head_subject, head_author, head_when,
  language and lang_class, and `Index.Entry` returns them with the rest of
  the row.
- `Store.RefreshHead` recomputes the summary and skips the tree walk when
  the recorded tip is still the branch tip, so a metadata or tag push
  costs one rev-parse. It runs from post-receive, from the rebuild, and
  after the default branch changes in settings.
- The language mapping moved to `internal/lang`, shared by the web pages
  and the summary; `fileClass` and `languageFor` are now one table.
- The home cards read the head, language, counts, ACL and newest event
  time from the index. The home page starts no git process at all; the
  all-git card builder stays as the fallback for a Web without an index.

Load harness at concurrency 4 with three repositories: home goes from 243
to 749 req/s, p50 from 16 ms to 5 ms, and the server runs no git child
process for those requests.

forge/index/head.go +69

@@ -0,0 +1,69 @@
	1	package index
	2
	3	// The head summary: a repository's default branch tip and the language it is
	4	// mostly made of.
	5	//
	6	// The landing page showed these from git on every request: `symbolic-ref`,
	7	// `rev-parse`, `log -1` and `ls-tree -r` per card. They change only when a push
	8	// moves the default branch, so the push records them and a page reads them.
	9
	10	import (
	11	"github.com/rodent-software/vole/forge/repo"
	12	"github.com/rodent-software/vole/internal/lang"
	13	)
	14
	15	type headSummary struct {
	16	SHA string
	17	Subject string
	18	Author string
	19	When int64
	20	Language string
	21	LangClass string
	22	}
	23
	24	// RefreshHead recomputes a repository's default branch summary. It runs when a
	25	// push lands (post-receive), on a rebuild, and after the default branch changes.
	26	// If the recorded SHA is still the branch tip, nothing is written: a tag or
	27	// metadata push then costs one rev-parse, not a tree walk.
	28	func (s Store) RefreshHead(m repo.Meta) error {
	29	branch := m.DefaultBranch
	30	if branch == "" {
	31	// The hook only knows the directory and the id; the branch is the row's.
	32	_ = s.db.QueryRow(`SELECT default_branch FROM repos WHERE id=?`, m.ID).Scan(&branch)
	33	}
	34	if branch == "" {
	35	branch = m.Git().Symref()
	36	}
	37	sha := ""
	38	if branch != "" {
	39	if tip, err := m.Git().RevParse("refs/heads/" + branch); err == nil {
	40	sha = tip
	41	}
	42	}
	43	var stored string
	44	if err := s.db.QueryRow(`SELECT head_sha FROM repos WHERE id=?`, m.ID).Scan(&stored); err != nil {
	45	return err
	46	}
	47	if stored == sha {
	48	return nil
	49	}
	50	if sha == "" {
	51	// The branch was deleted (or the repository still has no commits).
	52	return s.setHead(m.ID, headSummary{})
	53	}
	54	h := headSummary{SHA: sha}
	55	if commits, err := m.Git().Log(sha, 1); err == nil && len(commits) > 0 {
	56	h.Subject, h.Author, h.When = commits[0].Subject, commits[0].Author, commits[0].When
	57	}
	58	if tree, err := m.Git().LsTreeR(sha); err == nil {
	59	h.Language, h.LangClass = lang.Top(tree)
	60	}
	61	return s.setHead(m.ID, h)
	62	}
	63
	64	func (s *Store) setHead(repoID string, h headSummary) error {
	65	_, err := s.db.Exec(
	66	`UPDATE repos SET head_sha=?, head_subject=?, head_author=?, head_when=?, language=?, lang_class=? WHERE id=?`,
	67	h.SHA, h.Subject, h.Author, h.When, h.Language, h.LangClass, repoID)
	68	return err
	69	}