From 02c7c6dcd692cb0f1c2bfaf8fa03bc3077fb8ac9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C5=99emysl=20Janouch?= <p.janouch@gmail.com>
Date: Sat, 21 Nov 2015 19:48:15 +0100
Subject: [PATCH] degesch: export timers to Lua

---
 degesch.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 54 insertions(+), 1 deletion(-)

diff --git a/degesch.c b/degesch.c
index 3a80c3f..1f8a675 100644
--- a/degesch.c
+++ b/degesch.c
@@ -7458,6 +7458,7 @@ enum lua_hook_type
 	XLUA_HOOK_DEFUNCT,                  ///< No longer functional
 	XLUA_HOOK_INPUT,                    ///< Input hook
 	XLUA_HOOK_IRC,                      ///< IRC hook
+	XLUA_HOOK_TIMER,                    ///< One-shot timer
 };
 
 struct lua_hook
@@ -7466,9 +7467,11 @@ struct lua_hook
 	enum lua_hook_type type;            ///< Type of the hook
 	union
 	{
-		struct hook hook;               ///< Base structure
+		struct hook hook;               ///< Hook base structure
 		struct input_hook input_hook;   ///< Input hook
 		struct irc_hook irc_hook;       ///< IRC hook
+
+		struct poller_timer timer;      ///< Timer
 	}
 	data;                               ///< Hook data
 };
@@ -7485,6 +7488,9 @@ lua_hook_unhook (lua_State *L)
 	case XLUA_HOOK_IRC:
 		LIST_UNLINK (hook->plugin->ctx->irc_hooks,   &hook->data.hook);
 		break;
+	case XLUA_HOOK_TIMER:
+		poller_timer_reset (&hook->data.timer);
+		break;
 	default:
 		hard_assert (!"invalid hook type");
 	case XLUA_HOOK_DEFUNCT:
@@ -7644,6 +7650,31 @@ struct irc_hook_vtable lua_irc_hook_vtable =
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
+static void
+lua_timer_hook_dispatch (void *user_data)
+{
+	struct lua_hook *hook = user_data;
+	struct lua_plugin *plugin = hook->plugin;
+	lua_State *L = plugin->L;
+
+	lua_pushcfunction (L, lua_plugin_error_handler);
+
+	lua_rawgetp (L, LUA_REGISTRYINDEX, hook);  // 1: hook
+	lua_getuservalue (L, -1);                  // Retrieve function
+	lua_insert (L, -2);                        // Swap with the hook
+
+	if (lua_pcall (L, 1, 0, -3))
+	{
+		struct error *e = NULL;
+		(void) lua_plugin_process_error (plugin, lua_tostring (L, -1), &e);
+		log_global_error (plugin->ctx, "Lua: plugin \"#s\": #s: #s",
+			plugin->super.name, "timer hook", e->message);
+		error_free (e);
+	}
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
 static struct lua_hook *
 lua_plugin_push_hook (struct lua_plugin *plugin, int callback_index,
 	enum lua_hook_type type, int priority)
@@ -7691,10 +7722,32 @@ lua_plugin_hook_irc (lua_State *L)
 	return 1;
 }
 
+static int
+lua_plugin_hook_timer (lua_State *L)
+{
+	struct lua_plugin *plugin = lua_touserdata (L, lua_upvalueindex (1));
+	lua_Integer timeout = luaL_checkinteger (L, 2);
+
+	if (timeout < 0)
+		luaL_argerror (L, 2, "timeout mustn't be negative");
+
+	// This doesn't really hook anything but we can reuse the code
+	struct lua_hook *hook = lua_plugin_push_hook
+		(plugin, 1, XLUA_HOOK_TIMER, 0 /* priority doesn't apply */);
+
+	struct poller_timer *timer = &hook->data.timer;
+	poller_timer_init (timer, &plugin->ctx->poller);
+	timer->dispatcher = lua_timer_hook_dispatch;
+	timer->user_data = hook;
+	poller_timer_set (timer, timeout);
+	return 1;
+}
+
 static luaL_Reg lua_plugin_library[] =
 {
 	{ "hook_input", lua_plugin_hook_input },
 	{ "hook_irc",   lua_plugin_hook_irc   },
+	{ "hook_timer", lua_plugin_hook_timer },
 	{ NULL,         NULL                  },
 };