vole

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Read what a page needs once per request

5d440e37f16d06790ce87e2f8b7dcc7d9bf0532c · Keenan Nemetz · 10d ago · parent 34cbc99f

Read what a page needs once per request

A page and its header are built from the same facts, and each of them was
read separately: the repository (twice, each resolving HEAD's branch with
a git call), the open change requests (once for the header's count, once
for the page), and a change request looked up by reading every request.
On a repository with 30 change requests the overview paid 21 git
invocations after the metadata batching, and the requests list still paid
8.

Give each read request one memo, installed by the middleware, and have the
handlers and the header read through it. It lasts one request and covers
reads only: a request that writes metadata gets no memo, so there is no
TTL, no cross-request cache, and no invalidation protocol, and a push is
still visible on the next page load.

The header now takes the page it is rendering (`nav .Page "issues"`)
instead of six fields the view already carries, which is also why the memo
can reach it at all. Templates are unchanged in what they output.

server/web/activity.go +3−3

@@ -78,7 +78,7 @@ func normalizeActivityKind(kind string) string {
	78	78	return ""
	79	79	}
	80	80
	81		func (w Web) repoActivity(m repo.Meta, kind, actor, assignee string) activityFeed {
		81	func (w Web) repoActivity(memo requestMemo, m *repo.Meta, kind, actor, assignee string) activityFeed {
	82	82	g := m.Git()
	83	83	var events []activityEvent
	84	84	var lastCommit *git.Commit
@@ -130,7 +130,7 @@ func (w Web) repoActivity(m repo.Meta, kind, actor, assignee string) activityF
	130	130	}
	131	131
	132	132	if kind == "" \|\| kind == "change" {
	133		if requests, err := metadata.LoadRequests(g, metadata.Ref); err == nil {
		133	if requests, err := w.requestsAt(memo, m); err == nil {
	134	134	for _, req := range requests {
	135	135	if req.Open() {
	136	136	openChanges++
@@ -294,7 +294,7 @@ func (w Web) Activity(rw http.ResponseWriter, r http.Request) {
	294	294	kind := normalizeActivityKind(r.URL.Query().Get("kind"))
	295	295	actor := strings.TrimSpace(r.URL.Query().Get("actor"))
	296	296	assignee := strings.TrimSpace(r.URL.Query().Get("assignee"))
	297		feed := w.repoActivity(m, kind, actor, assignee)
		297	feed := w.repoActivity(memoOf(r), m, kind, actor, assignee)
	298	298	view := activityView{
	299	299	Page: w.page(r, m.Name+" · activity"), Name: m.Name, Kind: kind,
	300	300	Actor: actor, Assignee: assignee,