From ca61614b981fff436b50caabc2e61d4d962348b7 Mon Sep 17 00:00:00 2001
From: Thomas Harning Jr <harningt@gmail.com>
Date: Sun, 10 Jun 2007 16:01:26 +0000
Subject: Initial commit:  * Created tree structure  * Committed current
 version

---
 luaevent/src/luaevent.c | 164 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 luaevent/src/luaevent.c

(limited to 'luaevent/src/luaevent.c')

diff --git a/luaevent/src/luaevent.c b/luaevent/src/luaevent.c
new file mode 100644
index 0000000..c9b8153
--- /dev/null
+++ b/luaevent/src/luaevent.c
@@ -0,0 +1,164 @@
+#include "luaevent.h"
+
+#include <lua.h>
+#include <lauxlib.h>
+
+#define EVENT_BASE_MT "EVENT_BASE_MT"
+#define EVENT_CALLBACK_ARG_MT "EVENT_CALLBACK_ARG_MT"
+#define EVENT_BASE_LOCATION 1
+
+void setEventBase(lua_State* L, struct event_base* base) {
+	struct event_base** pbase = lua_newuserdata(L, sizeof(base));
+	*pbase = base;
+	luaL_getmetatable(L, EVENT_BASE_MT);
+	lua_setmetatable(L, -2);
+	lua_rawseti(L, LUA_ENVIRONINDEX, EVENT_BASE_LOCATION);
+}
+struct event_base* getEventBase(lua_State* L) {
+	struct event_base* base;
+	lua_rawgeti(L, LUA_ENVIRONINDEX, EVENT_BASE_LOCATION);
+	base = *(struct event_base**)lua_topointer(L, -1);
+	lua_pop(L, 1);
+	return base;
+}
+
+void freeCallbackArgs(le_callback* arg) {
+	if(arg->L) {
+		lua_State* L = arg->L;
+		arg->L = NULL;
+		event_del(&arg->ev);
+		luaL_unref(L, LUA_REGISTRYINDEX, arg->callbackRef);
+	}
+}
+/* le_callback is allocated at the beginning of the coroutine in which it
+is used, no need to manually de-allocate */
+
+/* Index for coroutine is fd as integer for *nix, as lightuserdata for Win */
+static void luaevent_callback(int fd, short event, void* p) {
+	le_callback* arg = p;
+	lua_State* L = arg->L;
+	int ret;
+	lua_rawgeti(L, LUA_REGISTRYINDEX, arg->callbackRef);
+	lua_pushinteger(L, event);
+	lua_call(L, 1, 1);
+	ret = lua_tointeger(L, -1);
+	lua_pop(L, 1);
+	if(ret == -1) {
+		freeCallbackArgs(arg);
+	} else {
+		struct event *ev = &arg->ev;
+		int newEvent = ret;
+		if(newEvent != event) { // Need to hook up new event...
+			event_del(ev);
+			event_set(ev, fd, EV_PERSIST | newEvent, luaevent_callback, arg);
+			event_add(ev, NULL);
+		}
+	}
+}
+
+static int luaevent_base_gc(lua_State* L) {
+	struct event_base** pbase = luaL_checkudata(L, 1, EVENT_BASE_MT);
+	if(*pbase) {
+		event_base_free(*pbase);
+		*pbase = NULL;
+	}
+	return 0;
+}
+
+static int luaevent_cb_gc(lua_State* L) {
+	le_callback* arg = luaL_checkudata(L, 1, EVENT_CALLBACK_ARG_MT);
+	freeCallbackArgs(arg);
+	return 0;
+}
+
+int getSocketFd(lua_State* L, int idx) {
+	int fd;
+	luaL_checktype(L, idx, LUA_TUSERDATA);
+	lua_getfield(L, idx, "getfd");
+	if(lua_isnil(L, -1))
+		return luaL_error(L, "Socket type missing 'getfd' method");
+	lua_pushvalue(L, idx);
+	lua_call(L, 1, 1);
+	fd = lua_tointeger(L, -1);
+	lua_pop(L, 1);
+	return fd;
+}
+
+/* Expected to be called at the beginning of the coro that uses it.. 
+Value must be kept until coro is complete....
+*/
+/* sock, event, callback */
+static int luaevent_addevent(lua_State* L) {
+	int fd, event, callbackRef;
+	le_callback* arg;
+	fd = getSocketFd(L, 1);
+	event = luaL_checkinteger(L, 2);
+	luaL_checktype(L, 3, LUA_TFUNCTION);
+	lua_pushvalue(L, 3);
+	callbackRef = luaL_ref(L, LUA_REGISTRYINDEX);
+	arg = lua_newuserdata(L, sizeof(*arg));
+	luaL_getmetatable(L, EVENT_CALLBACK_ARG_MT);
+	lua_setmetatable(L, -2);
+	
+	arg->L = L;
+	arg->callbackRef = callbackRef;
+	/* Setup event... */
+	event_set(&arg->ev, fd, event | EV_PERSIST, luaevent_callback, arg);
+	event_base_set(getEventBase(L), &arg->ev);
+	event_add(&arg->ev, NULL);
+	return 1;
+}
+
+static int luaevent_loop(lua_State* L) {
+	int ret = event_base_loop(getEventBase(L), 0);
+	lua_pushinteger(L, ret);
+	return 1;
+}
+
+static luaL_Reg funcs[] = {
+	{ "addevent", luaevent_addevent },
+	{ "loop", luaevent_loop },
+	{ NULL, NULL }
+};
+
+typedef struct {
+	const char* name;
+	int value;
+} namedInteger;
+
+static namedInteger consts[] = {
+	{"LEAVE", -1},
+	{"EV_READ", EV_READ},
+	{"EV_WRITE", EV_WRITE},
+	{NULL, 0}
+};
+
+void setNamedIntegers(lua_State* L, namedInteger* p) {
+	while(p->name) {
+		lua_pushinteger(L, p->value);
+		lua_setfield(L, -2, p->name);
+		p++;
+	}
+}
+
+/* Verified ok */
+int luaopen_luaevent_core(lua_State* L) {
+	/* Setup environ table */
+	lua_createtable(L, 1, 0);
+	lua_replace(L, LUA_ENVIRONINDEX);
+	/* Setup metatable */
+	luaL_newmetatable(L, EVENT_BASE_MT);
+	lua_pushcfunction(L, luaevent_base_gc);
+	lua_setfield(L, -2, "__gc");
+	lua_pop(L, 1);
+	luaL_newmetatable(L, EVENT_CALLBACK_ARG_MT);
+	lua_pushcfunction(L, luaevent_cb_gc);
+	lua_setfield(L, -2, "__gc");
+	lua_pop(L, 1);
+
+	setEventBase(L, event_init());
+	
+	luaL_register(L, "luaevent.core", funcs);
+	setNamedIntegers(L, consts);
+	return 1;
+}
-- 
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