From 4a287a724e257dbc9cd9b8a0c48bd15451acd2fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C5=99emysl=20Janouch?= <p.janouch@gmail.com>
Date: Tue, 24 Nov 2015 21:52:16 +0100
Subject: [PATCH] degesch: Lua: add a "server" property to buffers

---
 degesch.c | 138 ++++++++++++++++++++++++++++++------------------------
 1 file changed, 78 insertions(+), 60 deletions(-)

diff --git a/degesch.c b/degesch.c
index 90f441c..4cba07c 100644
--- a/degesch.c
+++ b/degesch.c
@@ -7362,40 +7362,6 @@ struct lua_buffer
 	struct weak_ref_link *weak_ref;     ///< A weak reference link
 };
 
-static int
-lua_buffer_gc (lua_State *L)
-{
-	struct lua_buffer *wrapper = luaL_checkudata (L, 1, XLUA_BUFFER_METATABLE);
-	if (wrapper->buffer)
-	{
-		lua_cache_invalidate (L, wrapper->buffer);
-		buffer_weak_unref (wrapper->buffer, &wrapper->weak_ref);
-		wrapper->buffer = NULL;
-	}
-	return 0;
-}
-
-static int
-lua_buffer_log (lua_State *L)
-{
-	struct lua_buffer *wrapper = luaL_checkudata (L, 1, XLUA_BUFFER_METATABLE);
-	luaL_argcheck (L, wrapper->buffer, 1, "dead reference used");
-	const char *message = luaL_checkstring (L, 2);
-
-	struct buffer *buffer = wrapper->buffer;
-	log_full (wrapper->plugin->ctx, buffer->server, buffer,
-		BUFFER_LINE_STATUS, "#s", message);
-	return 0;
-}
-
-static luaL_Reg lua_buffer_table[] =
-{
-	// TODO: some useful methods or values
-	{ "__gc", lua_buffer_gc  },
-	{ "log",  lua_buffer_log },
-	{ NULL,   NULL           }
-};
-
 static void
 lua_buffer_invalidate (void *object, void *user_data)
 {
@@ -7433,6 +7399,84 @@ struct lua_server
 	struct weak_ref_link *weak_ref;     ///< A weak reference link
 };
 
+static void
+lua_server_invalidate (void *object, void *user_data)
+{
+	struct lua_server *wrapper = user_data;
+	wrapper->server = NULL;
+	wrapper->weak_ref = NULL;
+	// This can in theory call the GC, order isn't arbitrary here
+	lua_cache_invalidate (wrapper->plugin->L, object);
+}
+
+static void
+lua_plugin_push_server (struct lua_plugin *plugin, struct server *server)
+{
+	lua_State *L = plugin->L;
+	if (lua_cache_get (L, server))
+		return;
+
+	struct lua_server *wrapper = lua_newuserdata (L, sizeof *wrapper);
+	luaL_setmetatable (L, XLUA_SERVER_METATABLE);
+	wrapper->plugin = plugin;
+	wrapper->server = server;
+	wrapper->weak_ref = server_weak_ref
+		(server, lua_server_invalidate, wrapper);
+	lua_cache_store (L, server, -1);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static int
+lua_buffer_gc (lua_State *L)
+{
+	struct lua_buffer *wrapper = luaL_checkudata (L, 1, XLUA_BUFFER_METATABLE);
+	if (wrapper->buffer)
+	{
+		lua_cache_invalidate (L, wrapper->buffer);
+		buffer_weak_unref (wrapper->buffer, &wrapper->weak_ref);
+		wrapper->buffer = NULL;
+	}
+	return 0;
+}
+
+static int
+lua_buffer_get_server (lua_State *L)
+{
+	struct lua_buffer *wrapper = luaL_checkudata (L, 1, XLUA_BUFFER_METATABLE);
+	luaL_argcheck (L, wrapper->buffer, 1, "dead reference used");
+
+	if (wrapper->buffer->server)
+		lua_plugin_push_server (wrapper->plugin, wrapper->buffer->server);
+	else
+		lua_pushnil (L);
+	return 1;
+}
+
+static int
+lua_buffer_log (lua_State *L)
+{
+	struct lua_buffer *wrapper = luaL_checkudata (L, 1, XLUA_BUFFER_METATABLE);
+	luaL_argcheck (L, wrapper->buffer, 1, "dead reference used");
+	const char *message = luaL_checkstring (L, 2);
+
+	struct buffer *buffer = wrapper->buffer;
+	log_full (wrapper->plugin->ctx, buffer->server, buffer,
+		BUFFER_LINE_STATUS, "#s", message);
+	return 0;
+}
+
+static luaL_Reg lua_buffer_table[] =
+{
+	// TODO: some useful methods or values
+	{ "__gc",       lua_buffer_gc         },
+	{ "get_server", lua_buffer_get_server },
+	{ "log",        lua_buffer_log        },
+	{ NULL,         NULL                  }
+};
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
 static int
 lua_server_gc (lua_State *L)
 {
@@ -7479,32 +7523,6 @@ static luaL_Reg lua_server_table[] =
 	{ NULL,         NULL                  }
 };
 
-static void
-lua_server_invalidate (void *object, void *user_data)
-{
-	struct lua_server *wrapper = user_data;
-	wrapper->server = NULL;
-	wrapper->weak_ref = NULL;
-	// This can in theory call the GC, order isn't arbitrary here
-	lua_cache_invalidate (wrapper->plugin->L, object);
-}
-
-static void
-lua_plugin_push_server (struct lua_plugin *plugin, struct server *server)
-{
-	lua_State *L = plugin->L;
-	if (lua_cache_get (L, server))
-		return;
-
-	struct lua_server *wrapper = lua_newuserdata (L, sizeof *wrapper);
-	luaL_setmetatable (L, XLUA_SERVER_METATABLE);
-	wrapper->plugin = plugin;
-	wrapper->server = server;
-	wrapper->weak_ref = server_weak_ref
-		(server, lua_server_invalidate, wrapper);
-	lua_cache_store (L, server, -1);
-}
-
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 #define XLUA_HOOK_METATABLE "hook"      ///< Identifier for the Lua metatable