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Index state changes for the activity feed

4d938fe894d56ff29b87fa0f2ebec50a744f2993 · Keenan Nemetz · 9d ago · parent e2a58f3a

Index state changes for the activity feed

The activity feed found closed, reopened and merged events by reading the
last 200 metadata commit subjects on every render: one git process per
repository, so the instance home with N repositories ran N of them. It was
the last derived read still going to git.

- A `state_changes` table is fed by the same refresh: a delta reads the
  commits in its range, a rebuild reads the whole metadata branch. Rows are
  keyed by the commit, so a retried or overlapping refresh cannot duplicate
  an event, and an ordinal keeps two changes in one second in branch order
  (commit times are seconds; a close and a reopen often share one).
- `Store.StateChanges` returns the events newest first; the feed reads it
  and keeps the metadata log as the fallback for a server without an index
  or a failed read.
- `git.Repo.Log` and `CommitsBetween` treat a limit of zero as no limit,
  which the rebuild needs, and `metadata.ParseStateSubject` is exported so
  the index derives the events without a second copy of the format.

The activity page now starts no metadata log; the instance home and the
instance activity page lose one process per visible repository. On the
load harness with three repositories: activity 496 req/s (p50 7 ms),
instance activity 230 req/s (p50 17 ms), home 202 req/s (p50 20 ms).

Schema version 7 rebuilds each repository on its first read after upgrade.

metadata/activity.go +5−2

@@ -31,7 +31,7 @@ func LoadStateChanges(g *git.Repo, n int) ([]StateChange, error) {
	31	31	}
	32	32	out := make([]StateChange, 0, len(commits)/4)
	33	33	for _, c := range commits {
	34		kind, id, state, ok := parseStateSubject(c.Subject)
		34	kind, id, state, ok := ParseStateSubject(c.Subject)
	35	35	if !ok {
	36	36	continue
	37	37	}
@@ -43,7 +43,10 @@ func LoadStateChanges(g *git.Repo, n int) ([]StateChange, error) {
	43	43	return out, nil
	44	44	}
	45	45
	46		func parseStateSubject(subject string) (kind, id, state string, ok bool) {
		46	// ParseStateSubject reads the canonical subject SetIssueState and SetRequestState
		47	// write. It is exported so the index can derive the same events from the commits
		48	// it reads without a second copy of the format.
		49	func ParseStateSubject(subject string) (kind, id, state string, ok bool) {
	47	50	fields := strings.Fields(subject)
	48	51	if len(fields) != 3 {
	49	52	return "", "", "", false