From b3f646b4788dc31239a6ee919c7ffa27109bed65 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Tue, 17 Sep 2019 10:35:58 -0700
Subject: [PATCH] ircd::m::room::events: Add prefetch() convenience to
 interface.

---
 include/ircd/m/room/events.h |  3 +++
 ircd/m_room.cc               | 41 ++++++++++++++++++++++++------------
 2 files changed, 30 insertions(+), 14 deletions(-)

diff --git a/include/ircd/m/room/events.h b/include/ircd/m/room/events.h
index 1caf8832d..285cc0909 100644
--- a/include/ircd/m/room/events.h
+++ b/include/ircd/m/room/events.h
@@ -71,6 +71,9 @@ struct ircd::m::room::events
 	const m::event &fetch(std::nothrow_t);
 	const m::event &fetch();
 
+	bool prefetch(const string_view &event_prop);
+	bool prefetch(); // uses property keys from any fetch::opts supplied.
+
 	bool seek_idx(const event::idx &);
 	bool seek(const uint64_t &depth = -1);
 	bool seek(const event::id &);
diff --git a/ircd/m_room.cc b/ircd/m_room.cc
index 720972412..1094929e6 100644
--- a/ircd/m_room.cc
+++ b/ircd/m_room.cc
@@ -1800,6 +1800,33 @@ catch(const db::not_found &e)
 	return false;
 }
 
+bool
+ircd::m::room::events::prefetch()
+{
+	assert(_event.fopts);
+	return m::prefetch(event_idx(), *_event.fopts);
+}
+
+bool
+ircd::m::room::events::prefetch(const string_view &event_prop)
+{
+	return m::prefetch(event_idx(), event_prop);
+}
+
+const ircd::m::event &
+ircd::m::room::events::fetch()
+{
+	m::seek(_event, event_idx());
+	return _event;
+}
+
+const ircd::m::event &
+ircd::m::room::events::fetch(std::nothrow_t)
+{
+	m::seek(_event, event_idx(), std::nothrow);
+	return _event;
+}
+
 ircd::m::room::events::operator
 ircd::m::event::idx()
 const
@@ -1840,20 +1867,6 @@ const
 	return std::get<1>(part);
 }
 
-const ircd::m::event &
-ircd::m::room::events::fetch()
-{
-	m::seek(_event, event_idx());
-	return _event;
-}
-
-const ircd::m::event &
-ircd::m::room::events::fetch(std::nothrow_t)
-{
-	m::seek(_event, event_idx(), std::nothrow);
-	return _event;
-}
-
 //
 // room::state
 //