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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/comment_writes.go +2−2

@@ -111,7 +111,7 @@ func (w Web) issueTopic(rw http.ResponseWriter, r http.Request, m *repo.Meta)
	111	111	// discussion. Unlike an issue, a comment here may be anchored to a diff line.
	112	112	func (w Web) requestTopic(rw http.ResponseWriter, r http.Request, m repo.Meta) (commentTopic, bool) {
	113	113	id := r.PathValue("id")
	114		req, err := metadata.GetRequest(m.Git(), id)
		114	req, err := w.requestAt(memoOf(r), m, id)
	115	115	if err != nil {
	116	116	w.notFound(rw, r)
	117	117	return nil, false
@@ -164,7 +164,7 @@ func (w Web) requestTopic(rw http.ResponseWriter, r http.Request, m *repo.Meta
	164	164	return "comment_thread", w.requestThread(r, m, req, t.target, msg)
	165	165	}
	166	166	t.reload = func() (string, any) {
	167		updated, err := metadata.GetRequest(m.Git(), id)
		167	updated, err := w.requestAt(memoOf(r), m, id)
	168	168	if err != nil {
	169	169	return "comment_thread", w.requestThread(r, m, req, nil,
	170	170	"the comment was saved, but the discussion could not be re-read: "+err.Error())