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- /*-
- * Copyright 2016 Vsevolod Stakhov
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include "lua_common.h"
-
- /***
- * @module rspamd_mempool
- * Rspamd memory pool is used to allocate memory attached to specific objects,
- * namely it was initially used for memory allocation for rspamd_task.
- *
- * All memory allocated by the pool is destroyed when the associated object is
- * destroyed. This allows a sort of controlled garbage collection for memory
- * allocated from the pool. Memory pools are extensively used by rspamd internal
- * components and provide some powerful features, such as destructors or
- * persistent variables.
- * @example
- local mempool = require "rspamd_mempool"
- local pool = mempool.create()
-
- pool:set_variable('a', 'bcd', 1, 1.01, false)
- local v1, v2, v3, v4 = pool:get_variable('a', 'string,double,double,bool')
- pool:destroy()
- */
-
- /* Lua bindings */
- /***
- * @function mempool.create([size])
- * Creates a memory pool of a specified `size` or platform dependent optimal size (normally, a page size)
- * @param {number} size size of a page inside pool
- * @return {rspamd_mempool} new pool object (that should be removed by explicit call to `pool:destroy()`)
- */
- LUA_FUNCTION_DEF (mempool, create);
- /***
- * @method mempool:add_destructor(func)
- * Adds new destructor function to the pool
- * @param {function} func function to be called when the pool is destroyed
- */
- LUA_FUNCTION_DEF (mempool, add_destructor);
- /***
- * @method mempool:destroy()
- * Destroys memory pool cleaning all variables and calling all destructors registered (both C and Lua ones)
- */
- LUA_FUNCTION_DEF (mempool, delete);
- LUA_FUNCTION_DEF (mempool, stat);
- LUA_FUNCTION_DEF (mempool, suggest_size);
- /***
- * @method mempool:set_variable(name, [value1[, value2 ...]])
- * Sets a variable that's valid during memory pool lifetime. This function allows
- * to pack multiple values inside a single variable. Currently supported types are:
- *
- * - `string`: packed as null terminated C string (so no `\0` are allowed)
- * - `number`: packed as C double
- * - `boolean`: packed as bool
- * @param {string} name variable's name to set
- */
- LUA_FUNCTION_DEF (mempool, set_variable);
- /***
- * @method mempool:set_bucket(name, num_values, [value1...valuen]|[table])
- * Stores a variable bucket of numbers where the first number is number of elements to pack
- * and then there should be either n numeric values or a plain table of numeric values
- * @param {string} name variable's name to set
- * @param {number} num_values number of variables in the bucket
- * @param {table|list} values values
- */
- LUA_FUNCTION_DEF (mempool, set_bucket);
- /***
- * @method mempool:get_variable(name[, type])
- * Unpacks mempool variable to lua If `type` is not specified, then a variable is
- * assumed to be zero-terminated C string. Otherwise, `type` is a comma separated (spaces are ignored)
- * list of types that should be unpacked from a variable's content. The following types
- * are supported:
- *
- * - `string`: null terminated C string (so no `\0` are allowed)
- * - `double`: returned as lua number
- * - `int`: unpack a single integer
- * - `int64`: unpack 64-bits integer
- * - `boolean`: unpack boolean
- * - `bucket`: bucket of numbers represented as a Lua table
- * - `fstrings`: list of rspamd_fstring_t (GList) represented as a Lua table
- * @param {string} name variable's name to get
- * @param {string} type list of types to be extracted
- * @return {variable list} list of variables extracted (but **not** a table)
- */
- LUA_FUNCTION_DEF (mempool, get_variable);
- /***
- * @method mempool:has_variable(name)
- * Checks if the specified variable `name` exists in the memory pool
- * @param {string} name variable's name to get
- * @return {boolean} `true` if variable exists and `false` otherwise
- */
- LUA_FUNCTION_DEF (mempool, has_variable);
-
- /***
- * @method mempool:delete_variable(name)
- * Removes the specified variable `name` from the memory pool
- * @param {string} name variable's name to remove
- * @return {boolean} `true` if variable exists and has been removed
- */
- LUA_FUNCTION_DEF (mempool, delete_variable);
-
- static const struct luaL_reg mempoollib_m[] = {
- LUA_INTERFACE_DEF (mempool, add_destructor),
- LUA_INTERFACE_DEF (mempool, stat),
- LUA_INTERFACE_DEF (mempool, suggest_size),
- LUA_INTERFACE_DEF (mempool, set_variable),
- LUA_INTERFACE_DEF (mempool, set_bucket),
- LUA_INTERFACE_DEF (mempool, get_variable),
- LUA_INTERFACE_DEF (mempool, has_variable),
- LUA_INTERFACE_DEF (mempool, delete_variable),
- LUA_INTERFACE_DEF (mempool, delete),
- {"destroy", lua_mempool_delete},
- {"__tostring", rspamd_lua_class_tostring},
- {NULL, NULL}
- };
-
- static const struct luaL_reg mempoollib_f[] = {
- LUA_INTERFACE_DEF (mempool, create),
- {NULL, NULL}
- };
-
- /*
- * Struct for lua destructor
- */
-
- struct lua_mempool_udata {
- lua_State *L;
- gint cbref;
- rspamd_mempool_t *mempool;
- };
-
- struct memory_pool_s *
- rspamd_lua_check_mempool (lua_State * L, gint pos)
- {
- void *ud = rspamd_lua_check_udata (L, pos, "rspamd{mempool}");
- luaL_argcheck (L, ud != NULL, pos, "'mempool' expected");
- return ud ? *((struct memory_pool_s **)ud) : NULL;
- }
-
-
- static int
- lua_mempool_create (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_mempool_new (
- rspamd_mempool_suggest_size (), "lua"), **pmempool;
-
- if (mempool) {
- pmempool = lua_newuserdata (L, sizeof (struct memory_pool_s *));
- rspamd_lua_setclass (L, "rspamd{mempool}", -1);
- *pmempool = mempool;
- }
- else {
- lua_pushnil (L);
- }
-
- return 1;
- }
-
- static void
- lua_mempool_destructor_func (gpointer p)
- {
- struct lua_mempool_udata *ud = p;
-
- lua_rawgeti (ud->L, LUA_REGISTRYINDEX, ud->cbref);
- if (lua_pcall (ud->L, 0, 0, 0) != 0) {
- msg_info ("call to destructor failed: %s", lua_tostring (ud->L, -1));
- lua_pop (ud->L, 1);
- }
- luaL_unref (ud->L, LUA_REGISTRYINDEX, ud->cbref);
- }
-
- static int
- lua_mempool_add_destructor (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
- struct lua_mempool_udata *ud;
-
- if (mempool) {
- if (lua_isfunction (L, 2)) {
- ud = rspamd_mempool_alloc (mempool,
- sizeof (struct lua_mempool_udata));
- lua_pushvalue (L, 2);
- /* Get a reference */
- ud->cbref = luaL_ref (L, LUA_REGISTRYINDEX);
- ud->L = L;
- ud->mempool = mempool;
- rspamd_mempool_add_destructor (mempool,
- lua_mempool_destructor_func,
- ud);
- }
- else {
- msg_err ("trying to add destructor without function");
- }
- }
- else {
- lua_pushnil (L);
- }
-
- return 1;
- }
-
- static int
- lua_mempool_delete (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
-
- if (mempool) {
- rspamd_mempool_delete (mempool);
- return 0;
- }
- else {
- lua_pushnil (L);
- }
-
- return 1;
- }
-
- static int
- lua_mempool_stat (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
-
- if (mempool) {
-
- }
- else {
- lua_pushnil (L);
- }
-
- return 1;
- }
-
- static int
- lua_mempool_suggest_size (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
-
- if (mempool) {
- lua_pushinteger (L, rspamd_mempool_suggest_size ());
- return 0;
- }
- else {
- lua_pushnil (L);
- }
-
- return 1;
- }
-
- struct lua_numbers_bucket {
- guint nelts;
- gdouble elts[0];
- };
-
- static int
- lua_mempool_set_bucket (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
- const gchar *var = luaL_checkstring (L, 2);
- struct lua_numbers_bucket *bucket;
- gint nelts = luaL_checknumber (L, 3), i;
-
- if (var && nelts > 0) {
- bucket = rspamd_mempool_alloc (mempool,
- sizeof (*bucket) + sizeof (gdouble) * nelts);
- bucket->nelts = nelts;
-
- if (lua_type (L, 4) == LUA_TTABLE) {
- /* Table version */
- for (i = 1; i <= nelts; i ++) {
- lua_rawgeti (L, 4, i);
- bucket->elts[i - 1] = lua_tonumber (L, -1);
- lua_pop (L, 1);
- }
- }
- else {
- for (i = 0; i <= nelts; i ++) {
- bucket->elts[i] = lua_tonumber (L, 4 + i);
- }
- }
-
- rspamd_mempool_set_variable (mempool, var, bucket, NULL);
- }
- else {
- return luaL_error (L, "invalid arguments");
- }
-
- return 0;
- }
-
- static int
- lua_mempool_set_variable (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
- const gchar *var = luaL_checkstring (L, 2);
- gpointer value;
- struct lua_numbers_bucket *bucket;
- gchar *vp;
- union {
- gdouble d;
- const gchar *s;
- gboolean b;
- } val;
- gsize slen;
- gint i, j, len = 0, type;
-
- if (mempool && var) {
-
- for (i = 3; i <= lua_gettop (L); i ++) {
- type = lua_type (L, i);
-
- if (type == LUA_TNUMBER) {
- /* We have some ambiguity here between integer and double */
- len += sizeof (gdouble);
- }
- else if (type == LUA_TBOOLEAN) {
- len += sizeof (gboolean);
- }
- else if (type == LUA_TSTRING) {
- (void)lua_tolstring (L, i, &slen);
- len += slen + 1;
- }
- else if (type == LUA_TTABLE) {
- /* We assume it as a bucket of numbers so far */
- slen = rspamd_lua_table_size (L, i);
- len += sizeof (gdouble) * slen + sizeof (*bucket);
- }
- else {
- msg_err ("cannot handle lua type %s", lua_typename (L, type));
- }
- }
-
- if (len == 0) {
- msg_err ("no values specified");
- }
- else {
- value = rspamd_mempool_alloc (mempool, len);
- vp = value;
-
- for (i = 3; i <= lua_gettop (L); i ++) {
- type = lua_type (L, i);
-
- if (type == LUA_TNUMBER) {
- val.d = lua_tonumber (L, i);
- memcpy (vp, &val, sizeof (gdouble));
- vp += sizeof (gdouble);
- }
- else if (type == LUA_TBOOLEAN) {
- val.b = lua_toboolean (L, i);
- memcpy (vp, &val, sizeof (gboolean));
- vp += sizeof (gboolean);
- }
- else if (type == LUA_TSTRING) {
- val.s = lua_tolstring (L, i, &slen);
- memcpy (vp, val.s, slen + 1);
- vp += slen + 1;
- }
- else if (type == LUA_TTABLE) {
- slen = rspamd_lua_table_size (L, i);
- /* XXX: Ret, ret, ret: alignment issues */
- bucket = (struct lua_numbers_bucket *)vp;
- bucket->nelts = slen;
-
- for (j = 0; j < slen; j ++) {
- lua_rawgeti (L, i, j + 1);
- bucket->elts[j] = lua_tonumber (L, -1);
- lua_pop (L, 1);
- }
-
- vp += sizeof (gdouble) * slen + sizeof (*bucket);
- }
- else {
- msg_err ("cannot handle lua type %s", lua_typename (L, type));
- }
- }
-
- rspamd_mempool_set_variable (mempool, var, value, NULL);
- }
-
- return 0;
- }
- else {
- lua_pushnil (L);
- }
-
- return 1;
- }
-
-
- static int
- lua_mempool_get_variable (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
- const gchar *var = luaL_checkstring (L, 2);
- const gchar *type = NULL, *pt;
- struct lua_numbers_bucket bucket;
- const gchar *value, *pv;
- guint len, nvar, slen, i;
-
- if (mempool && var) {
- value = rspamd_mempool_get_variable (mempool, var);
-
- if (lua_gettop (L) >= 3) {
- type = luaL_checkstring (L, 3);
- }
-
- if (value) {
-
- if (type) {
- pt = type;
- pv = value;
- nvar = 0;
-
- while ((len = strcspn (pt, ", ")) > 0) {
- if (len == sizeof ("double") - 1 &&
- g_ascii_strncasecmp (pt, "double", len) == 0) {
- gdouble num;
- memcpy (&num, pv, sizeof (gdouble));
- lua_pushnumber (L, num);
- pv += sizeof (gdouble);
- }
- else if (len == sizeof ("int") - 1 &&
- g_ascii_strncasecmp (pt, "int", len) == 0) {
- gint num;
- memcpy (&num, pv, sizeof (gint));
- lua_pushinteger (L, num);
- pv += sizeof (gint);
- }
- else if (len == sizeof ("int64") - 1 &&
- g_ascii_strncasecmp (pt, "int64", len) == 0) {
- gint64 num;
- memcpy (&num, pv, sizeof (gint64));
- lua_pushinteger (L, num);
- pv += sizeof (gint64);
- }
- else if (len == sizeof ("bool") - 1 &&
- g_ascii_strncasecmp (pt, "bool", len) == 0) {
- gboolean num;
- memcpy (&num, pv, sizeof (gboolean));
- lua_pushboolean (L, num);
- pv += sizeof (gboolean);
- }
- else if (len == sizeof ("string") - 1 &&
- g_ascii_strncasecmp (pt, "string", len) == 0) {
- slen = strlen ((const gchar *)pv);
- lua_pushlstring (L, (const gchar *)pv, slen);
- pv += slen + 1;
- }
- else if (len == sizeof ("gstring") - 1 &&
- g_ascii_strncasecmp (pt, "gstring", len) == 0) {
- GString *st = (GString *)pv;
- lua_pushlstring (L, st->str, st->len);
- pv += sizeof (GString *);
- }
- else if (len == sizeof ("bucket") - 1 &&
- g_ascii_strncasecmp (pt, "bucket", len) == 0) {
- memcpy (&bucket, pv, sizeof (bucket));
- lua_createtable (L, bucket.nelts, 0);
- pv += sizeof (struct lua_numbers_bucket);
-
- for (i = 0; i < bucket.nelts; i ++) {
- gdouble num;
- memcpy (&num, pv, sizeof (num));
- lua_pushnumber (L, num);
- lua_rawseti (L, -1, i + 1);
- pv += sizeof (num);
- }
- }
- else if (len == sizeof ("fstrings") - 1 &&
- g_ascii_strncasecmp (pt, "fstrings", len) == 0) {
- GList *cur;
- rspamd_fstring_t *fstr;
-
- cur = (GList *)pv;
- lua_newtable (L);
-
- i = 1;
- while (cur != NULL) {
- fstr = cur->data;
- lua_pushlstring (L, fstr->str, fstr->len);
- lua_rawseti (L, -2, i);
- i ++;
- cur = g_list_next (cur);
- }
-
- pv += sizeof (GList *);
- }
- else {
- msg_err ("unknown type for get_variable: %s", pt);
- lua_pushnil (L);
- }
-
- pt += len;
- pt += strspn (pt, ", ");
-
- nvar ++;
- }
-
- return nvar;
- }
-
- lua_pushstring (L, value);
- }
- else {
- lua_pushnil (L);
- }
- }
- else {
- lua_pushnil (L);
- }
-
- return 1;
- }
-
- static int
- lua_mempool_has_variable (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
- const gchar *var = luaL_checkstring (L, 2);
- gboolean ret = FALSE;
-
- if (mempool && var) {
- if (rspamd_mempool_get_variable (mempool, var) != NULL) {
- ret = TRUE;
- }
- }
-
- lua_pushboolean (L, ret);
-
- return 1;
- }
-
- static int
- lua_mempool_delete_variable (lua_State *L)
- {
- LUA_TRACE_POINT;
- struct memory_pool_s *mempool = rspamd_lua_check_mempool (L, 1);
- const gchar *var = luaL_checkstring (L, 2);
- gboolean ret = FALSE;
-
- if (mempool && var) {
- if (rspamd_mempool_get_variable (mempool, var) != NULL) {
- ret = TRUE;
-
- rspamd_mempool_remove_variable (mempool, var);
- }
- }
-
- lua_pushboolean (L, ret);
-
- return 1;
- }
-
- static gint
- lua_load_mempool (lua_State * L)
- {
- lua_newtable (L);
- luaL_register (L, NULL, mempoollib_f);
-
- return 1;
- }
-
- void
- luaopen_mempool (lua_State * L)
- {
- luaL_newmetatable (L, "rspamd{mempool}");
- lua_pushstring (L, "__index");
- lua_pushvalue (L, -2);
- lua_settable (L, -3);
-
- lua_pushstring (L, "class");
- lua_pushstring (L, "rspamd{mempool}");
- lua_rawset (L, -3);
-
- luaL_register (L, NULL, mempoollib_m);
- rspamd_lua_add_preload (L, "rspamd_mempool", lua_load_mempool);
-
- lua_pop (L, 1); /* remove metatable from stack */
- }
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