# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1279966058 -3600
# Node ID 263858d40ceba8883153813dc89c6daf9ee284b3
# Parent  6cdc313cf0ebe03000f2b576fce49f207536be0e
mod_smacks: Fix the logic for handling outgoing stanzas and ack requests

diff -r 6cdc313cf0eb -r 263858d40ceb mod_smacks/mod_smacks.lua
--- a/mod_smacks/mod_smacks.lua	Thu Jul 22 19:14:19 2010 +0100
+++ b/mod_smacks/mod_smacks.lua	Sat Jul 24 11:07:38 2010 +0100
@@ -1,6 +1,7 @@
 local st = require "util.stanza";
 
 local t_insert, t_remove = table.insert, table.remove;
+local math_min = math.min;
 local tonumber, tostring = tonumber, tostring;
 local add_filter = require "util.filters".add_filter;
 
@@ -24,20 +25,19 @@
 		function (session, stanza)
 			module:log("debug", "Enabling stream management");
 			session.smacks = true;
-			session.handled_stanza_count = 0;
+			
 			-- Overwrite process_stanza() and send()
-			local queue, queue_length = {}, 0;
-			session.outgoing_stanza_queue, session.outgoing_stanza_count = queue, queue_length;
+			local queue = {};
+			session.outgoing_stanza_queue = queue;
+			session.last_acknowledged_stanza = 0;
 			local _send = session.send;
 			function session.send(stanza)
 				local attr = stanza.attr;
 				if attr and not attr.xmlns then -- Stanza in default stream namespace
-					queue_length = queue_length + 1;
-					session.outgoing_stanza_count = queue_length;
-					queue[queue_length] = st.reply(stanza);
+					queue[#queue+1] = st.reply(stanza);
 				end
 				local ok, err = _send(stanza);
-				if ok and queue_length > max_unacked_stanzas and not session.awaiting_ack then
+				if ok and #queue > max_unacked_stanzas and not session.awaiting_ack then
 					session.awaiting_ack = true;
 					return _send(st.stanza("r", { xmlns = xmlns_sm }));
 				end
@@ -74,10 +74,19 @@
 	if not origin.smacks then return; end
 	origin.awaiting_ack = nil;
 	-- Remove handled stanzas from outgoing_stanza_queue
-	local handled_stanza_count = tonumber(stanza.attr.h)+1;
-	for i=1,handled_stanza_count do
+	local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
+	local queue = origin.outgoing_stanza_queue;
+	if handled_stanza_count > #queue then
+		module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
+			handled_stanza_count, #queue);
+		for i=1,#queue do
+			module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
+		end
+	end
+	for i=1,math_min(handled_stanza_count,#queue) do
 		t_remove(origin.outgoing_stanza_queue, 1);
 	end
+	origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
 	return true;
 end);