2 files changed, 108 insertions, 30 deletions

diff --git a/util/cache.lua b/util/cache.lua
index 9453697c..72b74351 100644
--- a/util/cache.lua
+++ b/util/cache.lua
@@ -1,11 +1,3 @@
-local cache_methods = {};
-local cache_mt = { __index = cache_methods };
-
-local function new(size)
-	assert(size > 0, "cache size must be greater than zero");
-	local data = {};
-	return setmetatable({ data = data, count = 0, size = size, head = nil, tail = nil }, cache_mt);
-end
 
 local function _remove(list, m)
 	if m.prev then
@@ -14,29 +6,32 @@ local function _remove(list, m)
 	if m.next then
 		m.next.prev = m.prev;
 	end
-	if list.tail == m then
-		list.tail = m.prev;
+	if list._tail == m then
+		list._tail = m.prev;
 	end
-	if list.head == m then
-		list.head = m.next;
+	if list._head == m then
+		list._head = m.next;
 	end
-	list.count = list.count - 1;
+	list._count = list._count - 1;
 end
 
 local function _insert(list, m)
-	if list.head then
-		list.head.prev = m;
+	if list._head then
+		list._head.prev = m;
 	end
-	m.prev, m.next = nil, list.head;
-	list.head = m;
-	if not list.tail then
-		list.tail = m;
+	m.prev, m.next = nil, list._head;
+	list._head = m;
+	if not list._tail then
+		list._tail = m;
 	end
-	list.count = list.count + 1;
+	list._count = list._count + 1;
 end
 
+local cache_methods = {};
+local cache_mt = { __index = cache_methods };
+
 function cache_methods:set(k, v)
-	local m = self.data[k];
+	local m = self._data[k];
 	if m then
 		-- Key already exists
 		if v ~= nil then
@@ -47,27 +42,33 @@ function cache_methods:set(k, v)
 		else
 			-- Remove from list
 			_remove(self, m);
-			self.data[k] = nil;
+			self._data[k] = nil;
 		end
-		return;
+		return true;
 	end
 	-- New key
 	if v == nil then
-		return;
+		return true;
 	end
 	-- Check whether we need to remove oldest k/v
-	if self.count == self.size then
-		self.data[self.tail.key] = nil;
-		_remove(self, self.tail);
+	if self._count == self.size then
+		local tail = self._tail;
+		local on_evict = self._on_evict;
+		if on_evict then
+			on_evict(tail.key, tail.value);
+		end
+		_remove(self, tail);
+		self._data[tail.key] = nil;
 	end
 
 	m = { key = k, value = v, prev = nil, next = nil };
-	self.data[k] = m;
+	self._data[k] = m;
 	_insert(self, m);
+	return true;
 end
 
 function cache_methods:get(k)
-	local m = self.data[k];
+	local m = self._data[k];
 	if m then
 		return m.value;
 	end
@@ -75,7 +76,7 @@ function cache_methods:get(k)
 end
 
 function cache_methods:items()
-	local m = self.head;
+	local m = self._head;
 	return function ()
 		if not m then
 			return;
@@ -86,6 +87,18 @@ function cache_methods:items()
 	end
 end
 
+function cache_methods:count()
+	return self._count;
+end
+
+local function new(size, on_evict)
+	size = assert(tonumber(size), "cache size must be a number");
+	size = math.floor(size);
+	assert(size > 0, "cache size must be greater than zero");
+	local data = {};
+	return setmetatable({ _data = data, _count = 0, size = size, _head = nil, _tail = nil, _on_evict = on_evict }, cache_mt);
+end
+
 return {
 	new = new;
 }
diff --git a/util/session.lua b/util/session.lua
new file mode 100644
index 00000000..fda7fccd
--- /dev/null
+++ b/util/session.lua
@@ -0,0 +1,65 @@
+local initialize_filters = require "util.filters".initialize;
+local logger = require "util.logger";
+
+local function new_session(typ)
+	local session = {
+		type = typ .. "_unauthed";
+	};
+	return session;
+end
+
+local function set_id(session)
+	local id = typ .. tostring(session):match("%x+$"):lower();
+	session.id = id;
+	return session;
+end
+
+local function set_logger(session)
+	local log = logger.init(id);
+	session.log = log;
+	return session;
+end
+
+local function set_conn(session, conn)
+	session.conn = conn;
+	session.ip = conn:ip();
+	return session;
+end
+
+local function set_send(session)
+	local conn = session.conn;
+	if not conn then
+		function session.send(data)
+			log("debug", "Discarding data sent to unconnected session: %s", tostring(data));
+			return false;
+		end
+		return session;
+	end
+	local filter = initialize_filters(session);
+	local w = conn.write;
+	session.send = function (t)
+		if t.name then
+			t = filter("stanzas/out", t);
+		end
+		if t then
+			t = filter("bytes/out", tostring(t));
+			if t then
+				local ret, err = w(conn, t);
+				if not ret then
+					session.log("debug", "Error writing to connection: %s", tostring(err));
+					return false, err;
+				end
+			end
+		end
+		return true;
+	end
+	return session;
+end
+
+return {
+	new = new_session;
+	set_id = set_id;
+	set_logger = set_logger;
+	set_conn = set_conn;
+	set_send = set_send;
+}