Look for new sends newest first, only as far back as they go

After each save the owner walked the whole outbox to find the sends
not yet queued, so a receiver long down made every save walk the
backlog. pure_app_outbox_newest visits saved sends newest first, and
the owner stops once every wired output reaches the number it queued
last, then queues what it found in order.

1 files changed, 7 insertions, 0 deletions

diff --git a/prototypes/connections/module.c b/prototypes/connections/module.c
index 5cb7f11..697e918 100644
--- a/prototypes/connections/module.c
+++ b/prototypes/connections/module.c
@@ -1668,6 +1668,13 @@ void pure_app_outbox(const PureApp *app, PureSentVisit visit, void *context) {
     }
 }
 
+void pure_app_outbox_newest(const PureApp *app, PureSentVisit visit, void *context) {
+    for (size_t i = app->sent_durable; i-- > 0;) {
+        const struct PureSent *sent = &app->sent[i];
+        if (!sent->trimmed && !visit(context, sent->output, sent->seq, (PureSpan){sent->payload, sent->size})) return;
+    }
+}
+
 void pure_app_trim(PureApp *app, uint32_t output, uint64_t through) {
     for (size_t i = 0; i < app->sent_durable; ++i)
         if (app->sent[i].output == output && app->sent[i].seq <= through && !app->sent[i].trimmed) {