240 lines
6.0 KiB
C
240 lines
6.0 KiB
C
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#include <lighttpd/config_lua.h>
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#include <lighttpd/condition_lua.h>
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#include <lighttpd/value_lua.h>
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#include <lighttpd/actions_lua.h>
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#include <lualib.h>
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#include <lauxlib.h>
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typedef int (*LuaWrapper)(liServer *srv, lua_State *L, gpointer data);
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static liValue* lua_params_to_value(liServer *srv, lua_State *L) {
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liValue *val, *subval;
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switch (lua_gettop(L)) {
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case 0:
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case 1:
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return NULL;
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case 2:
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return li_value_from_lua(srv, L);
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default:
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val = li_value_new_list();
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g_array_set_size(val->data.list, lua_gettop(L) - 1);
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while (lua_gettop(L) > 1) {
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if (NULL == (subval = li_value_from_lua(srv, L))) {
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ERROR(srv, "Couldn't convert value from lua (lua type '%s')", lua_typename(L, lua_type(L, -1)));
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li_value_free(val);
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return NULL;
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}
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g_array_index(val->data.list, liValue*, lua_gettop(L) - 1) = subval;
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}
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return val;
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}
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return NULL;
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}
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/* Creates a table on the lua stack */
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static void lua_push_publish_hash_metatable(liServer *srv, lua_State *L);
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static int lua_str_hash_index(lua_State *L) {
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liServer *srv;
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GHashTable *ht;
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LuaWrapper wrapper;
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srv = (liServer*) lua_touserdata(L, lua_upvalueindex(1));
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lua_pushstring(L, "__ht"); lua_rawget(L, 1);
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ht = (GHashTable*) lua_touserdata(L, -1); lua_pop(L, 1);
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lua_pushstring(L, "__wrapper"); lua_rawget(L, 1);
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wrapper = (LuaWrapper)(intptr_t) lua_touserdata(L, -1); lua_pop(L, 1);
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if (!lua_isstring(L, 2) || !ht || !wrapper) {
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lua_pop(L, lua_gettop(L));
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lua_pushstring(L, "lookup failed");
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lua_error(L);
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return 0;
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}
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/* TRACE(srv, "str hash index: '%s'", luaL_checklstring(L, 2, NULL)); */
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lua_newtable(L);
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lua_pushlightuserdata(L, ht);
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lua_setfield(L, -2, "__ht");
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lua_pushlightuserdata(L, (void*)(intptr_t)wrapper);
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lua_setfield(L, -2, "__wrapper");
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lua_pushstring(L, "__key"); lua_rawget(L, 1);
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if (lua_isstring(L, -1)) {
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lua_pushstring(L, ".");
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lua_pushvalue(L, 2);
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lua_concat(L, 3);
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} else {
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lua_pop(L, 1);
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lua_pushvalue(L, 2);
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}
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lua_setfield(L, -2, "__key");
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lua_push_publish_hash_metatable(srv, L);
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lua_setmetatable(L, -2);
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return 1;
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}
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static int lua_str_hash_call(lua_State *L) {
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liServer *srv;
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GHashTable *ht;
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LuaWrapper wrapper;
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const char *key;
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gpointer d;
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srv = (liServer*) lua_touserdata(L, lua_upvalueindex(1));
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lua_pushstring(L, "__ht"); lua_rawget(L, 1);
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ht = (GHashTable*) lua_touserdata(L, -1); lua_pop(L, 1);
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lua_pushstring(L, "__wrapper"); lua_rawget(L, 1);
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wrapper = (LuaWrapper)(intptr_t) lua_touserdata(L, -1); lua_pop(L, 1);
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lua_pushstring(L, "__key"); lua_rawget(L, 1);
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key = luaL_checklstring(L, -1, NULL);
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/* TRACE(srv, "str hash call: '%s'", key); */
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if (key && NULL != (d = g_hash_table_lookup(ht, key))) {
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lua_pop(L, 1);
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return wrapper(srv, L, d);
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}
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lua_pop(L, lua_gettop(L));
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lua_pushstring(L, "lookup failed");
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lua_error(L);
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return 0;
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}
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#define LUA_PUBLISH_HASH "GHashTable*"
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static void lua_push_publish_hash_metatable(liServer *srv, lua_State *L) {
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if (luaL_newmetatable(L, LUA_PUBLISH_HASH)) {
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lua_pushlightuserdata(L, srv);
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lua_pushcclosure(L, lua_str_hash_index, 1);
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lua_setfield(L, -2, "__index");
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lua_pushlightuserdata(L, srv);
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lua_pushcclosure(L, lua_str_hash_call, 1);
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lua_setfield(L, -2, "__call");
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}
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}
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static gboolean publish_str_hash(liServer *srv, lua_State *L, GHashTable *ht, LuaWrapper wrapper) {
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lua_newtable(L); /* { } */
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lua_pushlightuserdata(L, ht);
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lua_setfield(L, -2, "__ht");
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lua_pushlightuserdata(L, (void*)(intptr_t)wrapper);
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lua_setfield(L, -2, "__wrapper");
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lua_push_publish_hash_metatable(srv, L);
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lua_setmetatable(L, -2);
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return TRUE;
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}
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static int handle_server_action(liServer *srv, lua_State *L, gpointer _sa) {
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liServerAction *sa = (liServerAction*) _sa;
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liValue *val;
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liAction *a;
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lua_checkstack(L, 16);
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val = lua_params_to_value(srv, L);
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/* TRACE(srv, "%s", "Creating action"); */
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a = sa->li_create_action(srv, sa->p, val);
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li_value_free(val);
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if (NULL == a) {
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lua_pushstring(L, "creating action failed");
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lua_error(L);
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}
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return lua_push_action(srv, L, a);
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}
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static int handle_server_setup(liServer *srv, lua_State *L, gpointer _ss) {
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liServerSetup *ss = (liServerSetup*) _ss;
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liValue *val;
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lua_checkstack(L, 16);
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val = lua_params_to_value(srv, L);
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/* TRACE(srv, "%s", "Calling setup"); */
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if (!ss->setup(srv, ss->p, val)) {
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li_value_free(val);
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lua_pushstring(L, "setup failed");
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lua_error(L);
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}
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li_value_free(val);
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return 0;
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}
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static int traceback (lua_State *L) {
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if (!lua_isstring(L, 1)) /* 'message' not a string? */
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return 1; /* keep it intact */
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lua_getfield(L, LUA_GLOBALSINDEX, "debug");
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if (!lua_istable(L, -1)) {
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lua_pop(L, 1);
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return 1;
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}
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lua_getfield(L, -1, "traceback");
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if (!lua_isfunction(L, -1)) {
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lua_pop(L, 2);
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return 1;
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}
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lua_pushvalue(L, 1); /* pass error message */
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lua_pushinteger(L, 2); /* skip this function and traceback */
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lua_call(L, 2, 1); /* call debug.traceback */
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return 1;
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}
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static int push_traceback(lua_State *L, int narg) {
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int base = lua_gettop(L) - narg; /* function index */
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lua_pushcfunction(L, traceback);
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lua_insert(L, base);
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return base;
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}
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gboolean li_config_lua_load(liServer *srv, const gchar *filename) {
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lua_State *L;
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int errfunc;
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L = luaL_newstate();
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luaL_openlibs(L);
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if (0 != luaL_loadfile(L, filename)) {
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ERROR(srv, "Loading script '%s' failed: %s", filename, lua_tostring(L, -1));
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return FALSE;
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}
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DEBUG(srv, "Loaded config script '%s'", filename);
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publish_str_hash(srv, L, srv->setups, handle_server_setup);
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lua_setfield(L, LUA_GLOBALSINDEX, "setup");
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publish_str_hash(srv, L, srv->actions, handle_server_action);
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lua_setfield(L, LUA_GLOBALSINDEX, "action");
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lua_push_lvalues_dict(srv, L);
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errfunc = push_traceback(L, 0);
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if (lua_pcall(L, 0, 1, errfunc)) {
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ERROR(srv, "lua_pcall(): %s", lua_tostring(L, -1));
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return FALSE;
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}
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lua_remove(L, errfunc);
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lua_pop(L, 1); /* pop the ret-value */
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lua_getfield(L, LUA_GLOBALSINDEX, "actions");
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srv->mainaction = lua_get_action(L, -1);
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li_action_acquire(srv->mainaction);
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lua_pop(L, 1);
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assert(lua_gettop(L) == 0);
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lua_close(L);
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return TRUE;
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}
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