mod_c2s,mod_s2s: Fire event just before writes

Could allow e.g. a XEP-0198 implementation to efficiently send ack
requests at optimal times without using timers or nextTick.

2 files changed, 14 insertions, 0 deletions

diff --git a/plugins/mod_c2s.lua b/plugins/mod_c2s.lua
index 722932f6..8bd28782 100644
--- a/plugins/mod_c2s.lua
+++ b/plugins/mod_c2s.lua
@@ -393,6 +393,13 @@ function listener.ondrain(conn)
 	end
 end
 
+function listener.onpredrain(conn)
+	local session = sessions[conn];
+	if session then
+		return (hosts[session.host] or prosody).events.fire_event("c2s-pre-ondrain", { session = session });
+	end
+end
+
 local function keepalive(event)
 	local session = event.session;
 	if not session.notopen then
diff --git a/plugins/mod_s2s.lua b/plugins/mod_s2s.lua
index 75eb15ca..d800138f 100644
--- a/plugins/mod_s2s.lua
+++ b/plugins/mod_s2s.lua
@@ -860,6 +860,13 @@ function listener.ondrain(conn)
 	end
 end
 
+function listener.onpredrain(conn)
+	local session = sessions[conn];
+	if session then
+		return (hosts[session.host] or prosody).events.fire_event("s2s-pre-ondrain", { session = session });
+	end
+end
+
 function listener.register_outgoing(conn, session)
 	sessions[conn] = session;
 	initialize_session(session);