Thierry FOURNIER | 6f1fd48 | 2015-01-23 14:06:13 +0100 | [diff] [blame] | 1 | #include <lauxlib.h> |
| 2 | #include <lua.h> |
| 3 | #include <lualib.h> |
| 4 | |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 5 | #include <ebpttree.h> |
| 6 | |
| 7 | #include <common/cfgparse.h> |
| 8 | |
| 9 | #include <types/hlua.h> |
Thierry FOURNIER | 65f34c6 | 2015-02-16 20:11:43 +0100 | [diff] [blame] | 10 | #include <types/proto_tcp.h> |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 11 | #include <types/proxy.h> |
| 12 | |
Thierry FOURNIER | 55da165 | 2015-01-23 11:36:30 +0100 | [diff] [blame] | 13 | #include <proto/arg.h> |
Thierry FOURNIER | d0fa538 | 2015-02-16 20:14:51 +0100 | [diff] [blame^] | 14 | #include <proto/payload.h> |
| 15 | #include <proto/proto_http.h> |
| 16 | #include <proto/sample.h> |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 17 | #include <proto/task.h> |
| 18 | |
Thierry FOURNIER | 6f1fd48 | 2015-01-23 14:06:13 +0100 | [diff] [blame] | 19 | /* Lua uses longjmp to perform yield or throwing errors. This |
| 20 | * macro is used only for identifying the function that can |
| 21 | * not return because a longjmp is executed. |
| 22 | * __LJMP marks a prototype of hlua file that can use longjmp. |
| 23 | * WILL_LJMP() marks an lua function that will use longjmp. |
| 24 | * MAY_LJMP() marks an lua function that may use longjmp. |
| 25 | */ |
| 26 | #define __LJMP |
| 27 | #define WILL_LJMP(func) func |
| 28 | #define MAY_LJMP(func) func |
| 29 | |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 30 | /* The main Lua execution context. */ |
| 31 | struct hlua gL; |
| 32 | |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 33 | /* This is the memory pool containing all the signal structs. These |
| 34 | * struct are used to store each requiered signal between two tasks. |
| 35 | */ |
| 36 | struct pool_head *pool2_hlua_com; |
| 37 | |
Thierry FOURNIER | a4a0f3d | 2015-01-23 12:08:30 +0100 | [diff] [blame] | 38 | /* List head of the function called at the initialisation time. */ |
| 39 | struct list hlua_init_functions = LIST_HEAD_INIT(hlua_init_functions); |
| 40 | |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 41 | /* Store the fast lua context for coroutines. This tree uses the |
| 42 | * Lua stack pointer value as indexed entry, and store the associated |
| 43 | * hlua context. |
| 44 | */ |
| 45 | struct eb_root hlua_ctx = EB_ROOT_UNIQUE; |
| 46 | |
Thierry FOURNIER | 2ba18a2 | 2015-01-23 14:07:08 +0100 | [diff] [blame] | 47 | /* The following variables contains the reference of the different |
| 48 | * Lua classes. These references are useful for identify metadata |
| 49 | * associated with an object. |
| 50 | */ |
| 51 | static int class_core_ref; |
Thierry FOURNIER | 65f34c6 | 2015-02-16 20:11:43 +0100 | [diff] [blame] | 52 | static int class_txn_ref; |
Thierry FOURNIER | 2ba18a2 | 2015-01-23 14:07:08 +0100 | [diff] [blame] | 53 | |
Thierry FOURNIER | 55da165 | 2015-01-23 11:36:30 +0100 | [diff] [blame] | 54 | /* These functions converts types between HAProxy internal args or |
| 55 | * sample and LUA types. Another function permits to check if the |
| 56 | * LUA stack contains arguments according with an required ARG_T |
| 57 | * format. |
| 58 | */ |
| 59 | static int hlua_arg2lua(lua_State *L, const struct arg *arg); |
| 60 | static int hlua_lua2arg(lua_State *L, int ud, struct arg *arg); |
| 61 | __LJMP static int hlua_lua2arg_check(lua_State *L, int first, struct arg *argp, unsigned int mask); |
| 62 | static int hlua_smp2lua(lua_State *L, const struct sample *smp); |
| 63 | static int hlua_lua2smp(lua_State *L, int ud, struct sample *smp); |
| 64 | |
Thierry FOURNIER | e8b9a40 | 2015-02-25 18:48:12 +0100 | [diff] [blame] | 65 | /* Used to check an Lua function type in the stack. It creates and |
| 66 | * returns a reference of the function. This function throws an |
| 67 | * error if the rgument is not a "function". |
| 68 | */ |
| 69 | __LJMP unsigned int hlua_checkfunction(lua_State *L, int argno) |
| 70 | { |
| 71 | if (!lua_isfunction(L, argno)) { |
| 72 | const char *msg = lua_pushfstring(L, "function expected, got %s", luaL_typename(L, -1)); |
| 73 | WILL_LJMP(luaL_argerror(L, argno, msg)); |
| 74 | } |
| 75 | lua_pushvalue(L, argno); |
| 76 | return luaL_ref(L, LUA_REGISTRYINDEX); |
| 77 | } |
| 78 | |
| 79 | /* The three following functions are useful for adding entries |
| 80 | * in a table. These functions takes a string and respectively an |
| 81 | * integer, a string or a function and add it to the table in the |
| 82 | * top of the stack. |
| 83 | * |
| 84 | * These functions throws an error if no more stack size is |
| 85 | * available. |
| 86 | */ |
| 87 | __LJMP static inline void hlua_class_const_int(lua_State *L, const char *name, |
| 88 | unsigned int value) |
| 89 | { |
| 90 | if (!lua_checkstack(L, 2)) |
| 91 | WILL_LJMP(luaL_error(L, "full stack")); |
| 92 | lua_pushstring(L, name); |
| 93 | lua_pushunsigned(L, value); |
| 94 | lua_settable(L, -3); |
| 95 | } |
| 96 | __LJMP static inline void hlua_class_const_str(lua_State *L, const char *name, |
| 97 | const char *value) |
| 98 | { |
| 99 | if (!lua_checkstack(L, 2)) |
| 100 | WILL_LJMP(luaL_error(L, "full stack")); |
| 101 | lua_pushstring(L, name); |
| 102 | lua_pushstring(L, value); |
| 103 | lua_settable(L, -3); |
| 104 | } |
| 105 | __LJMP static inline void hlua_class_function(lua_State *L, const char *name, |
| 106 | int (*function)(lua_State *L)) |
| 107 | { |
| 108 | if (!lua_checkstack(L, 2)) |
| 109 | WILL_LJMP(luaL_error(L, "full stack")); |
| 110 | lua_pushstring(L, name); |
| 111 | lua_pushcclosure(L, function, 0); |
| 112 | lua_settable(L, -3); |
| 113 | } |
| 114 | |
| 115 | /* This function check the number of arguments available in the |
| 116 | * stack. If the number of arguments available is not the same |
| 117 | * then <nb> an error is throwed. |
| 118 | */ |
| 119 | __LJMP static inline void check_args(lua_State *L, int nb, char *fcn) |
| 120 | { |
| 121 | if (lua_gettop(L) == nb) |
| 122 | return; |
| 123 | WILL_LJMP(luaL_error(L, "'%s' needs %d arguments", fcn, nb)); |
| 124 | } |
| 125 | |
| 126 | /* Return true if the data in stack[<ud>] is an object of |
| 127 | * type <class_ref>. |
| 128 | */ |
| 129 | static int hlua_udataistype(lua_State *L, int ud, int class_ref) |
| 130 | { |
| 131 | void *p = lua_touserdata(L, ud); |
| 132 | if (!p) |
| 133 | return 0; |
| 134 | |
| 135 | if (!lua_getmetatable(L, ud)) |
| 136 | return 0; |
| 137 | |
| 138 | lua_rawgeti(L, LUA_REGISTRYINDEX, class_ref); |
| 139 | if (!lua_rawequal(L, -1, -2)) { |
| 140 | lua_pop(L, 2); |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | lua_pop(L, 2); |
| 145 | return 1; |
| 146 | } |
| 147 | |
| 148 | /* Return an object of the expected type, or throws an error. */ |
| 149 | __LJMP static void *hlua_checkudata(lua_State *L, int ud, int class_ref) |
| 150 | { |
| 151 | if (!hlua_udataistype(L, ud, class_ref)) |
| 152 | WILL_LJMP(luaL_argerror(L, 1, NULL)); |
| 153 | return lua_touserdata(L, ud); |
| 154 | } |
| 155 | |
| 156 | /* This fucntion push an error string prefixed by the file name |
| 157 | * and the line number where the error is encountered. |
| 158 | */ |
| 159 | static int hlua_pusherror(lua_State *L, const char *fmt, ...) |
| 160 | { |
| 161 | va_list argp; |
| 162 | va_start(argp, fmt); |
| 163 | luaL_where(L, 1); |
| 164 | lua_pushvfstring(L, fmt, argp); |
| 165 | va_end(argp); |
| 166 | lua_concat(L, 2); |
| 167 | return 1; |
| 168 | } |
| 169 | |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 170 | /* This function register a new signal. "lua" is the current lua |
| 171 | * execution context. It contains a pointer to the associated task. |
| 172 | * "link" is a list head attached to an other task that must be wake |
| 173 | * the lua task if an event occurs. This is useful with external |
| 174 | * events like TCP I/O or sleep functions. This funcion allocate |
| 175 | * memory for the signal. |
| 176 | */ |
| 177 | static int hlua_com_new(struct hlua *lua, struct list *link) |
| 178 | { |
| 179 | struct hlua_com *com = pool_alloc2(pool2_hlua_com); |
| 180 | if (!com) |
| 181 | return 0; |
| 182 | LIST_ADDQ(&lua->com, &com->purge_me); |
| 183 | LIST_ADDQ(link, &com->wake_me); |
| 184 | com->task = lua->task; |
| 185 | return 1; |
| 186 | } |
| 187 | |
| 188 | /* This function purge all the pending signals when the LUA execution |
| 189 | * is finished. This prevent than a coprocess try to wake a deleted |
| 190 | * task. This function remove the memory associated to the signal. |
| 191 | */ |
| 192 | static void hlua_com_purge(struct hlua *lua) |
| 193 | { |
| 194 | struct hlua_com *com, *back; |
| 195 | |
| 196 | /* Delete all pending communication signals. */ |
| 197 | list_for_each_entry_safe(com, back, &lua->com, purge_me) { |
| 198 | LIST_DEL(&com->purge_me); |
| 199 | LIST_DEL(&com->wake_me); |
| 200 | pool_free2(pool2_hlua_com, com); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /* This function sends signals. It wakes all the tasks attached |
| 205 | * to a list head, and remove the signal, and free the used |
| 206 | * memory. |
| 207 | */ |
| 208 | static void hlua_com_wake(struct list *wake) |
| 209 | { |
| 210 | struct hlua_com *com, *back; |
| 211 | |
| 212 | /* Wake task and delete all pending communication signals. */ |
| 213 | list_for_each_entry_safe(com, back, wake, wake_me) { |
| 214 | LIST_DEL(&com->purge_me); |
| 215 | LIST_DEL(&com->wake_me); |
| 216 | task_wakeup(com->task, TASK_WOKEN_MSG); |
| 217 | pool_free2(pool2_hlua_com, com); |
| 218 | } |
| 219 | } |
| 220 | |
Thierry FOURNIER | 55da165 | 2015-01-23 11:36:30 +0100 | [diff] [blame] | 221 | /* This functions is used with sample fetch and converters. It |
| 222 | * converts the HAProxy configuration argument in a lua stack |
| 223 | * values. |
| 224 | * |
| 225 | * It takes an array of "arg", and each entry of the array is |
| 226 | * converted and pushed in the LUA stack. |
| 227 | */ |
| 228 | static int hlua_arg2lua(lua_State *L, const struct arg *arg) |
| 229 | { |
| 230 | switch (arg->type) { |
| 231 | case ARGT_SINT: |
| 232 | lua_pushinteger(L, arg->data.sint); |
| 233 | break; |
| 234 | |
| 235 | case ARGT_UINT: |
| 236 | case ARGT_TIME: |
| 237 | case ARGT_SIZE: |
| 238 | lua_pushunsigned(L, arg->data.sint); |
| 239 | break; |
| 240 | |
| 241 | case ARGT_STR: |
| 242 | lua_pushlstring(L, arg->data.str.str, arg->data.str.len); |
| 243 | break; |
| 244 | |
| 245 | case ARGT_IPV4: |
| 246 | case ARGT_IPV6: |
| 247 | case ARGT_MSK4: |
| 248 | case ARGT_MSK6: |
| 249 | case ARGT_FE: |
| 250 | case ARGT_BE: |
| 251 | case ARGT_TAB: |
| 252 | case ARGT_SRV: |
| 253 | case ARGT_USR: |
| 254 | case ARGT_MAP: |
| 255 | default: |
| 256 | lua_pushnil(L); |
| 257 | break; |
| 258 | } |
| 259 | return 1; |
| 260 | } |
| 261 | |
| 262 | /* This function take one entrie in an LUA stack at the index "ud", |
| 263 | * and try to convert it in an HAProxy argument entry. This is useful |
| 264 | * with sample fetch wrappers. The input arguments are gived to the |
| 265 | * lua wrapper and converted as arg list by thi function. |
| 266 | */ |
| 267 | static int hlua_lua2arg(lua_State *L, int ud, struct arg *arg) |
| 268 | { |
| 269 | switch (lua_type(L, ud)) { |
| 270 | |
| 271 | case LUA_TNUMBER: |
| 272 | case LUA_TBOOLEAN: |
| 273 | arg->type = ARGT_SINT; |
| 274 | arg->data.sint = lua_tointeger(L, ud); |
| 275 | break; |
| 276 | |
| 277 | case LUA_TSTRING: |
| 278 | arg->type = ARGT_STR; |
| 279 | arg->data.str.str = (char *)lua_tolstring(L, ud, (size_t *)&arg->data.str.len); |
| 280 | break; |
| 281 | |
| 282 | case LUA_TUSERDATA: |
| 283 | case LUA_TNIL: |
| 284 | case LUA_TTABLE: |
| 285 | case LUA_TFUNCTION: |
| 286 | case LUA_TTHREAD: |
| 287 | case LUA_TLIGHTUSERDATA: |
| 288 | arg->type = ARGT_SINT; |
| 289 | arg->data.uint = 0; |
| 290 | break; |
| 291 | } |
| 292 | return 1; |
| 293 | } |
| 294 | |
| 295 | /* the following functions are used to convert a struct sample |
| 296 | * in Lua type. This useful to convert the return of the |
| 297 | * fetchs or converters. |
| 298 | */ |
| 299 | static int hlua_smp2lua(lua_State *L, const struct sample *smp) |
| 300 | { |
| 301 | switch (smp->type) { |
| 302 | case SMP_T_SINT: |
| 303 | lua_pushinteger(L, smp->data.sint); |
| 304 | break; |
| 305 | |
| 306 | case SMP_T_BOOL: |
| 307 | case SMP_T_UINT: |
| 308 | lua_pushunsigned(L, smp->data.uint); |
| 309 | break; |
| 310 | |
| 311 | case SMP_T_BIN: |
| 312 | case SMP_T_STR: |
| 313 | lua_pushlstring(L, smp->data.str.str, smp->data.str.len); |
| 314 | break; |
| 315 | |
| 316 | case SMP_T_METH: |
| 317 | switch (smp->data.meth.meth) { |
| 318 | case HTTP_METH_OPTIONS: lua_pushstring(L, "OPTIONS"); break; |
| 319 | case HTTP_METH_GET: lua_pushstring(L, "GET"); break; |
| 320 | case HTTP_METH_HEAD: lua_pushstring(L, "HEAD"); break; |
| 321 | case HTTP_METH_POST: lua_pushstring(L, "POST"); break; |
| 322 | case HTTP_METH_PUT: lua_pushstring(L, "PUT"); break; |
| 323 | case HTTP_METH_DELETE: lua_pushstring(L, "DELETE"); break; |
| 324 | case HTTP_METH_TRACE: lua_pushstring(L, "TRACE"); break; |
| 325 | case HTTP_METH_CONNECT: lua_pushstring(L, "CONNECT"); break; |
| 326 | case HTTP_METH_OTHER: |
| 327 | lua_pushlstring(L, smp->data.meth.str.str, smp->data.meth.str.len); |
| 328 | break; |
| 329 | default: |
| 330 | lua_pushnil(L); |
| 331 | break; |
| 332 | } |
| 333 | break; |
| 334 | |
| 335 | case SMP_T_IPV4: |
| 336 | case SMP_T_IPV6: |
| 337 | case SMP_T_ADDR: /* This type is never used to qualify a sample. */ |
| 338 | default: |
| 339 | lua_pushnil(L); |
| 340 | break; |
| 341 | } |
| 342 | return 1; |
| 343 | } |
| 344 | |
| 345 | /* the following functions are used to convert an Lua type in a |
| 346 | * struct sample. This is useful to provide data from a converter |
| 347 | * to the LUA code. |
| 348 | */ |
| 349 | static int hlua_lua2smp(lua_State *L, int ud, struct sample *smp) |
| 350 | { |
| 351 | switch (lua_type(L, ud)) { |
| 352 | |
| 353 | case LUA_TNUMBER: |
| 354 | smp->type = SMP_T_SINT; |
| 355 | smp->data.sint = lua_tointeger(L, ud); |
| 356 | break; |
| 357 | |
| 358 | |
| 359 | case LUA_TBOOLEAN: |
| 360 | smp->type = SMP_T_BOOL; |
| 361 | smp->data.uint = lua_toboolean(L, ud); |
| 362 | break; |
| 363 | |
| 364 | case LUA_TSTRING: |
| 365 | smp->type = SMP_T_STR; |
| 366 | smp->flags |= SMP_F_CONST; |
| 367 | smp->data.str.str = (char *)lua_tolstring(L, ud, (size_t *)&smp->data.str.len); |
| 368 | break; |
| 369 | |
| 370 | case LUA_TUSERDATA: |
| 371 | case LUA_TNIL: |
| 372 | case LUA_TTABLE: |
| 373 | case LUA_TFUNCTION: |
| 374 | case LUA_TTHREAD: |
| 375 | case LUA_TLIGHTUSERDATA: |
| 376 | smp->type = SMP_T_BOOL; |
| 377 | smp->data.uint = 0; |
| 378 | break; |
| 379 | } |
| 380 | return 1; |
| 381 | } |
| 382 | |
| 383 | /* This function check the "argp" builded by another conversion function |
| 384 | * is in accord with the expected argp defined by the "mask". The fucntion |
| 385 | * returns true or false. It can be adjust the types if there compatibles. |
| 386 | */ |
| 387 | __LJMP int hlua_lua2arg_check(lua_State *L, int first, struct arg *argp, unsigned int mask) |
| 388 | { |
| 389 | int min_arg; |
| 390 | int idx; |
| 391 | |
| 392 | idx = 0; |
| 393 | min_arg = ARGM(mask); |
| 394 | mask >>= ARGM_BITS; |
| 395 | |
| 396 | while (1) { |
| 397 | |
| 398 | /* Check oversize. */ |
| 399 | if (idx >= ARGM_NBARGS && argp[idx].type != ARGT_STOP) { |
| 400 | WILL_LJMP(luaL_argerror(L, first + idx, "Malformad argument mask")); |
| 401 | } |
| 402 | |
| 403 | /* Check for mandatory arguments. */ |
| 404 | if (argp[idx].type == ARGT_STOP) { |
| 405 | if (idx + 1 < min_arg) |
| 406 | WILL_LJMP(luaL_argerror(L, first + idx, "Mandatory argument expected")); |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | /* Check for exceed the number of requiered argument. */ |
| 411 | if ((mask & ARGT_MASK) == ARGT_STOP && |
| 412 | argp[idx].type != ARGT_STOP) { |
| 413 | WILL_LJMP(luaL_argerror(L, first + idx, "Last argument expected")); |
| 414 | } |
| 415 | |
| 416 | if ((mask & ARGT_MASK) == ARGT_STOP && |
| 417 | argp[idx].type == ARGT_STOP) { |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | /* Compatibility mask. */ |
| 422 | switch (argp[idx].type) { |
| 423 | case ARGT_SINT: |
| 424 | switch (mask & ARGT_MASK) { |
| 425 | case ARGT_UINT: argp[idx].type = mask & ARGT_MASK; break; |
| 426 | case ARGT_TIME: argp[idx].type = mask & ARGT_MASK; break; |
| 427 | case ARGT_SIZE: argp[idx].type = mask & ARGT_MASK; break; |
| 428 | } |
| 429 | break; |
| 430 | } |
| 431 | |
| 432 | /* Check for type of argument. */ |
| 433 | if ((mask & ARGT_MASK) != argp[idx].type) { |
| 434 | const char *msg = lua_pushfstring(L, "'%s' expected, got '%s'", |
| 435 | arg_type_names[(mask & ARGT_MASK)], |
| 436 | arg_type_names[argp[idx].type & ARGT_MASK]); |
| 437 | WILL_LJMP(luaL_argerror(L, first + idx, msg)); |
| 438 | } |
| 439 | |
| 440 | /* Next argument. */ |
| 441 | mask >>= ARGT_BITS; |
| 442 | idx++; |
| 443 | } |
| 444 | } |
| 445 | |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 446 | /* |
| 447 | * The following functions are used to make correspondance between the the |
| 448 | * executed lua pointer and the "struct hlua *" that contain the context. |
| 449 | * They run with the tree head "hlua_ctx", they just perform lookup in the |
| 450 | * tree. |
| 451 | * |
| 452 | * - hlua_gethlua : return the hlua context associated with an lua_State. |
| 453 | * - hlua_delhlua : remove the association between hlua context and lua_state. |
| 454 | * - hlua_sethlua : create the association between hlua context and lua_state. |
| 455 | */ |
| 456 | static inline struct hlua *hlua_gethlua(lua_State *L) |
| 457 | { |
| 458 | struct ebpt_node *node; |
| 459 | |
| 460 | node = ebpt_lookup(&hlua_ctx, L); |
| 461 | if (!node) |
| 462 | return NULL; |
| 463 | return ebpt_entry(node, struct hlua, node); |
| 464 | } |
| 465 | static inline void hlua_delhlua(struct hlua *hlua) |
| 466 | { |
| 467 | if (hlua->node.key) |
| 468 | ebpt_delete(&hlua->node); |
| 469 | } |
| 470 | static inline void hlua_sethlua(struct hlua *hlua) |
| 471 | { |
| 472 | hlua->node.key = hlua->T; |
| 473 | ebpt_insert(&hlua_ctx, &hlua->node); |
| 474 | } |
| 475 | |
| 476 | /* This function initialises the Lua environment stored in the session. |
| 477 | * It must be called at the start of the session. This function creates |
| 478 | * an LUA coroutine. It can not be use to crete the main LUA context. |
| 479 | */ |
| 480 | int hlua_ctx_init(struct hlua *lua, struct task *task) |
| 481 | { |
| 482 | lua->Mref = LUA_REFNIL; |
| 483 | lua->state = HLUA_STOP; |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 484 | LIST_INIT(&lua->com); |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 485 | lua->T = lua_newthread(gL.T); |
| 486 | if (!lua->T) { |
| 487 | lua->Tref = LUA_REFNIL; |
| 488 | return 0; |
| 489 | } |
| 490 | hlua_sethlua(lua); |
| 491 | lua->Tref = luaL_ref(gL.T, LUA_REGISTRYINDEX); |
| 492 | lua->task = task; |
| 493 | return 1; |
| 494 | } |
| 495 | |
| 496 | /* Used to destroy the Lua coroutine when the attached session or task |
| 497 | * is destroyed. The destroy also the memory context. The struct "lua" |
| 498 | * is not freed. |
| 499 | */ |
| 500 | void hlua_ctx_destroy(struct hlua *lua) |
| 501 | { |
| 502 | /* Remove context. */ |
| 503 | hlua_delhlua(lua); |
| 504 | |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 505 | /* Purge all the pending signals. */ |
| 506 | hlua_com_purge(lua); |
| 507 | |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 508 | /* The thread is garbage collected by Lua. */ |
| 509 | luaL_unref(lua->T, LUA_REGISTRYINDEX, lua->Mref); |
| 510 | luaL_unref(gL.T, LUA_REGISTRYINDEX, lua->Tref); |
| 511 | } |
| 512 | |
| 513 | /* This function is used to restore the Lua context when a coroutine |
| 514 | * fails. This function copy the common memory between old coroutine |
| 515 | * and the new coroutine. The old coroutine is destroyed, and its |
| 516 | * replaced by the new coroutine. |
| 517 | * If the flag "keep_msg" is set, the last entry of the old is assumed |
| 518 | * as string error message and it is copied in the new stack. |
| 519 | */ |
| 520 | static int hlua_ctx_renew(struct hlua *lua, int keep_msg) |
| 521 | { |
| 522 | lua_State *T; |
| 523 | int new_ref; |
| 524 | |
| 525 | /* Renew the main LUA stack doesn't have sense. */ |
| 526 | if (lua == &gL) |
| 527 | return 0; |
| 528 | |
| 529 | /* Remove context. */ |
| 530 | hlua_delhlua(lua); |
| 531 | |
| 532 | /* New Lua coroutine. */ |
| 533 | T = lua_newthread(gL.T); |
| 534 | if (!T) |
| 535 | return 0; |
| 536 | |
| 537 | /* Copy last error message. */ |
| 538 | if (keep_msg) |
| 539 | lua_xmove(lua->T, T, 1); |
| 540 | |
| 541 | /* Copy data between the coroutines. */ |
| 542 | lua_rawgeti(lua->T, LUA_REGISTRYINDEX, lua->Mref); |
| 543 | lua_xmove(lua->T, T, 1); |
| 544 | new_ref = luaL_ref(T, LUA_REGISTRYINDEX); /* Valur poped. */ |
| 545 | |
| 546 | /* Destroy old data. */ |
| 547 | luaL_unref(lua->T, LUA_REGISTRYINDEX, lua->Mref); |
| 548 | |
| 549 | /* The thread is garbage collected by Lua. */ |
| 550 | luaL_unref(gL.T, LUA_REGISTRYINDEX, lua->Tref); |
| 551 | |
| 552 | /* Fill the struct with the new coroutine values. */ |
| 553 | lua->Mref = new_ref; |
| 554 | lua->T = T; |
| 555 | lua->Tref = luaL_ref(gL.T, LUA_REGISTRYINDEX); |
| 556 | |
| 557 | /* Set context. */ |
| 558 | hlua_sethlua(lua); |
| 559 | |
| 560 | return 1; |
| 561 | } |
| 562 | |
| 563 | /* This function start or resumes the Lua stack execution. If the flag |
| 564 | * "yield_allowed" if no set and the LUA stack execution returns a yield |
| 565 | * The function return an error. |
| 566 | * |
| 567 | * The function can returns 4 values: |
| 568 | * - HLUA_E_OK : The execution is terminated without any errors. |
| 569 | * - HLUA_E_AGAIN : The execution must continue at the next associated |
| 570 | * task wakeup. |
| 571 | * - HLUA_E_ERRMSG : An error has occured, an error message is set in |
| 572 | * the top of the stack. |
| 573 | * - HLUA_E_ERR : An error has occured without error message. |
| 574 | * |
| 575 | * If an error occured, the stack is renewed and it is ready to run new |
| 576 | * LUA code. |
| 577 | */ |
| 578 | static enum hlua_exec hlua_ctx_resume(struct hlua *lua, int yield_allowed) |
| 579 | { |
| 580 | int ret; |
| 581 | const char *msg; |
| 582 | |
| 583 | lua->state = HLUA_RUN; |
| 584 | |
| 585 | /* Call the function. */ |
| 586 | ret = lua_resume(lua->T, gL.T, lua->nargs); |
| 587 | switch (ret) { |
| 588 | |
| 589 | case LUA_OK: |
| 590 | ret = HLUA_E_OK; |
| 591 | break; |
| 592 | |
| 593 | case LUA_YIELD: |
| 594 | if (!yield_allowed) { |
| 595 | lua_settop(lua->T, 0); /* Empty the stack. */ |
| 596 | if (!lua_checkstack(lua->T, 1)) { |
| 597 | ret = HLUA_E_ERR; |
| 598 | break; |
| 599 | } |
| 600 | lua_pushfstring(lua->T, "yield not allowed"); |
| 601 | ret = HLUA_E_ERRMSG; |
| 602 | break; |
| 603 | } |
| 604 | ret = HLUA_E_AGAIN; |
| 605 | break; |
| 606 | |
| 607 | case LUA_ERRRUN: |
| 608 | if (!lua_checkstack(lua->T, 1)) { |
| 609 | ret = HLUA_E_ERR; |
| 610 | break; |
| 611 | } |
| 612 | msg = lua_tostring(lua->T, -1); |
| 613 | lua_settop(lua->T, 0); /* Empty the stack. */ |
| 614 | lua_pop(lua->T, 1); |
| 615 | if (msg) |
| 616 | lua_pushfstring(lua->T, "runtime error: %s", msg); |
| 617 | else |
| 618 | lua_pushfstring(lua->T, "unknown runtime error"); |
| 619 | ret = HLUA_E_ERRMSG; |
| 620 | break; |
| 621 | |
| 622 | case LUA_ERRMEM: |
| 623 | lua_settop(lua->T, 0); /* Empty the stack. */ |
| 624 | if (!lua_checkstack(lua->T, 1)) { |
| 625 | ret = HLUA_E_ERR; |
| 626 | break; |
| 627 | } |
| 628 | lua_pushfstring(lua->T, "out of memory error"); |
| 629 | ret = HLUA_E_ERRMSG; |
| 630 | break; |
| 631 | |
| 632 | case LUA_ERRERR: |
| 633 | if (!lua_checkstack(lua->T, 1)) { |
| 634 | ret = HLUA_E_ERR; |
| 635 | break; |
| 636 | } |
| 637 | msg = lua_tostring(lua->T, -1); |
| 638 | lua_settop(lua->T, 0); /* Empty the stack. */ |
| 639 | lua_pop(lua->T, 1); |
| 640 | if (msg) |
| 641 | lua_pushfstring(lua->T, "message handler error: %s", msg); |
| 642 | else |
| 643 | lua_pushfstring(lua->T, "message handler error"); |
| 644 | ret = HLUA_E_ERRMSG; |
| 645 | break; |
| 646 | |
| 647 | default: |
| 648 | lua_settop(lua->T, 0); /* Empty the stack. */ |
| 649 | if (!lua_checkstack(lua->T, 1)) { |
| 650 | ret = HLUA_E_ERR; |
| 651 | break; |
| 652 | } |
| 653 | lua_pushfstring(lua->T, "unknonwn error"); |
| 654 | ret = HLUA_E_ERRMSG; |
| 655 | break; |
| 656 | } |
| 657 | |
| 658 | switch (ret) { |
| 659 | case HLUA_E_AGAIN: |
| 660 | break; |
| 661 | |
| 662 | case HLUA_E_ERRMSG: |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 663 | hlua_com_purge(lua); |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 664 | hlua_ctx_renew(lua, 1); |
| 665 | lua->state = HLUA_STOP; |
| 666 | break; |
| 667 | |
| 668 | case HLUA_E_ERR: |
| 669 | lua->state = HLUA_STOP; |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 670 | hlua_com_purge(lua); |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 671 | hlua_ctx_renew(lua, 0); |
| 672 | break; |
| 673 | |
| 674 | case HLUA_E_OK: |
| 675 | lua->state = HLUA_STOP; |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 676 | hlua_com_purge(lua); |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 677 | break; |
| 678 | } |
| 679 | |
| 680 | return ret; |
| 681 | } |
| 682 | |
Thierry FOURNIER | 65f34c6 | 2015-02-16 20:11:43 +0100 | [diff] [blame] | 683 | /* A class is a lot of memory that contain data. This data can be a table, |
| 684 | * an integer or user data. This data is associated with a metatable. This |
| 685 | * metatable have an original version registred in the global context with |
| 686 | * the name of the object (_G[<name>] = <metable> ). |
| 687 | * |
| 688 | * A metable is a table that modify the standard behavior of a standard |
| 689 | * access to the associated data. The entries of this new metatable are |
| 690 | * defined as is: |
| 691 | * |
| 692 | * http://lua-users.org/wiki/MetatableEvents |
| 693 | * |
| 694 | * __index |
| 695 | * |
| 696 | * we access an absent field in a table, the result is nil. This is |
| 697 | * true, but it is not the whole truth. Actually, such access triggers |
| 698 | * the interpreter to look for an __index metamethod: If there is no |
| 699 | * such method, as usually happens, then the access results in nil; |
| 700 | * otherwise, the metamethod will provide the result. |
| 701 | * |
| 702 | * Control 'prototype' inheritance. When accessing "myTable[key]" and |
| 703 | * the key does not appear in the table, but the metatable has an __index |
| 704 | * property: |
| 705 | * |
| 706 | * - if the value is a function, the function is called, passing in the |
| 707 | * table and the key; the return value of that function is returned as |
| 708 | * the result. |
| 709 | * |
| 710 | * - if the value is another table, the value of the key in that table is |
| 711 | * asked for and returned (and if it doesn't exist in that table, but that |
| 712 | * table's metatable has an __index property, then it continues on up) |
| 713 | * |
| 714 | * - Use "rawget(myTable,key)" to skip this metamethod. |
| 715 | * |
| 716 | * http://www.lua.org/pil/13.4.1.html |
| 717 | * |
| 718 | * __newindex |
| 719 | * |
| 720 | * Like __index, but control property assignment. |
| 721 | * |
| 722 | * __mode - Control weak references. A string value with one or both |
| 723 | * of the characters 'k' and 'v' which specifies that the the |
| 724 | * keys and/or values in the table are weak references. |
| 725 | * |
| 726 | * __call - Treat a table like a function. When a table is followed by |
| 727 | * parenthesis such as "myTable( 'foo' )" and the metatable has |
| 728 | * a __call key pointing to a function, that function is invoked |
| 729 | * (passing any specified arguments) and the return value is |
| 730 | * returned. |
| 731 | * |
| 732 | * __metatable - Hide the metatable. When "getmetatable( myTable )" is |
| 733 | * called, if the metatable for myTable has a __metatable |
| 734 | * key, the value of that key is returned instead of the |
| 735 | * actual metatable. |
| 736 | * |
| 737 | * __tostring - Control string representation. When the builtin |
| 738 | * "tostring( myTable )" function is called, if the metatable |
| 739 | * for myTable has a __tostring property set to a function, |
| 740 | * that function is invoked (passing myTable to it) and the |
| 741 | * return value is used as the string representation. |
| 742 | * |
| 743 | * __len - Control table length. When the table length is requested using |
| 744 | * the length operator ( '#' ), if the metatable for myTable has |
| 745 | * a __len key pointing to a function, that function is invoked |
| 746 | * (passing myTable to it) and the return value used as the value |
| 747 | * of "#myTable". |
| 748 | * |
| 749 | * __gc - Userdata finalizer code. When userdata is set to be garbage |
| 750 | * collected, if the metatable has a __gc field pointing to a |
| 751 | * function, that function is first invoked, passing the userdata |
| 752 | * to it. The __gc metamethod is not called for tables. |
| 753 | * (See http://lua-users.org/lists/lua-l/2006-11/msg00508.html) |
| 754 | * |
| 755 | * Special metamethods for redefining standard operators: |
| 756 | * http://www.lua.org/pil/13.1.html |
| 757 | * |
| 758 | * __add "+" |
| 759 | * __sub "-" |
| 760 | * __mul "*" |
| 761 | * __div "/" |
| 762 | * __unm "!" |
| 763 | * __pow "^" |
| 764 | * __concat ".." |
| 765 | * |
| 766 | * Special methods for redfining standar relations |
| 767 | * http://www.lua.org/pil/13.2.html |
| 768 | * |
| 769 | * __eq "==" |
| 770 | * __lt "<" |
| 771 | * __le "<=" |
| 772 | */ |
| 773 | |
| 774 | /* |
| 775 | * |
| 776 | * |
| 777 | * Class TXN |
| 778 | * |
| 779 | * |
| 780 | */ |
| 781 | |
| 782 | /* Returns a struct hlua_session if the stack entry "ud" is |
| 783 | * a class session, otherwise it throws an error. |
| 784 | */ |
| 785 | __LJMP static struct hlua_txn *hlua_checktxn(lua_State *L, int ud) |
| 786 | { |
| 787 | return (struct hlua_txn *)MAY_LJMP(hlua_checkudata(L, ud, class_txn_ref)); |
| 788 | } |
| 789 | |
Thierry FOURNIER | 05c0b8a | 2015-02-25 11:43:21 +0100 | [diff] [blame] | 790 | __LJMP static int hlua_setpriv(lua_State *L) |
| 791 | { |
| 792 | MAY_LJMP(check_args(L, 2, "set_priv")); |
| 793 | |
| 794 | /* It is useles to retrieve the session, but this function |
| 795 | * runs only in a session context. |
| 796 | */ |
| 797 | MAY_LJMP(hlua_checktxn(L, 1)); |
| 798 | struct hlua *hlua = hlua_gethlua(L); |
| 799 | |
| 800 | /* Remove previous value. */ |
| 801 | if (hlua->Mref != -1) |
| 802 | luaL_unref(L, hlua->Mref, LUA_REGISTRYINDEX); |
| 803 | |
| 804 | /* Get and store new value. */ |
| 805 | lua_pushvalue(L, 2); /* Copy the element 2 at the top of the stack. */ |
| 806 | hlua->Mref = luaL_ref(L, LUA_REGISTRYINDEX); /* pop the previously pushed value. */ |
| 807 | |
| 808 | return 0; |
| 809 | } |
| 810 | |
| 811 | __LJMP static int hlua_getpriv(lua_State *L) |
| 812 | { |
| 813 | MAY_LJMP(check_args(L, 1, "get_priv")); |
| 814 | |
| 815 | /* It is useles to retrieve the session, but this function |
| 816 | * runs only in a session context. |
| 817 | */ |
| 818 | MAY_LJMP(hlua_checktxn(L, 1)); |
| 819 | struct hlua *hlua = hlua_gethlua(L); |
| 820 | |
| 821 | /* Push configuration index in the stack. */ |
| 822 | lua_rawgeti(L, LUA_REGISTRYINDEX, hlua->Mref); |
| 823 | |
| 824 | return 1; |
| 825 | } |
| 826 | |
Thierry FOURNIER | 65f34c6 | 2015-02-16 20:11:43 +0100 | [diff] [blame] | 827 | /* Create stack entry containing a class TXN. This function |
| 828 | * return 0 if the stack does not contains free slots, |
| 829 | * otherwise it returns 1. |
| 830 | */ |
| 831 | static int hlua_txn_new(lua_State *L, struct session *s, struct proxy *p, void *l7) |
| 832 | { |
| 833 | struct hlua_txn *hs; |
| 834 | |
| 835 | /* Check stack size. */ |
| 836 | if (!lua_checkstack(L, 2)) |
| 837 | return 0; |
| 838 | |
| 839 | /* NOTE: The allocation never fails. The failure |
| 840 | * throw an error, and the function never returns. |
| 841 | * if the throw is not avalaible, the process is aborted. |
| 842 | */ |
| 843 | hs = lua_newuserdata(L, sizeof(struct hlua_txn)); |
| 844 | hs->s = s; |
| 845 | hs->p = p; |
| 846 | hs->l7 = l7; |
| 847 | |
| 848 | /* Pop a class sesison metatable and affect it to the userdata. */ |
| 849 | lua_rawgeti(L, LUA_REGISTRYINDEX, class_txn_ref); |
| 850 | lua_setmetatable(L, -2); |
| 851 | |
| 852 | return 1; |
| 853 | } |
| 854 | |
Thierry FOURNIER | d0fa538 | 2015-02-16 20:14:51 +0100 | [diff] [blame^] | 855 | /* This function is an LUA binding. It is called with each sample-fetch. |
| 856 | * It uses closure argument to store the associated sample-fetch. It |
| 857 | * returns only one argument or throws an error. An error is throwed |
| 858 | * only if an error is encoutered during the argument parsing. If |
| 859 | * the "sample-fetch" function fails, nil is returned. |
| 860 | */ |
| 861 | __LJMP static int hlua_run_sample_fetch(lua_State *L) |
| 862 | { |
| 863 | struct hlua_txn *s; |
| 864 | struct hlua_sample_fetch *f; |
| 865 | struct arg args[ARGM_NBARGS]; |
| 866 | int i; |
| 867 | struct sample smp; |
| 868 | |
| 869 | /* Get closure arguments. */ |
| 870 | f = (struct hlua_sample_fetch *)lua_touserdata(L, lua_upvalueindex(1)); |
| 871 | |
| 872 | /* Get traditionnal arguments. */ |
| 873 | s = MAY_LJMP(hlua_checktxn(L, 1)); |
| 874 | |
| 875 | /* Get extra arguments. */ |
| 876 | for (i = 0; i <= lua_gettop(L); i++) { |
| 877 | if (i >= ARGM_NBARGS) |
| 878 | break; |
| 879 | hlua_lua2arg(L, i + 2, &args[i]); |
| 880 | } |
| 881 | args[i].type = ARGT_STOP; |
| 882 | |
| 883 | /* Check arguments. */ |
| 884 | MAY_LJMP(hlua_lua2arg_check(L, 1, args, f->f->arg_mask)); |
| 885 | |
| 886 | /* Run the special args cehcker. */ |
| 887 | if (!f->f->val_args(args, NULL)) { |
| 888 | lua_pushfstring(L, "error in arguments"); |
| 889 | WILL_LJMP(lua_error(L)); |
| 890 | } |
| 891 | |
| 892 | /* Initialise the sample. */ |
| 893 | memset(&smp, 0, sizeof(smp)); |
| 894 | |
| 895 | /* Run the sample fetch process. */ |
| 896 | if (!f->f->process(s->p, s->s, s->l7, 0, args, &smp, f->f->kw, f->f->private)) { |
| 897 | lua_pushnil(L); |
| 898 | return 1; |
| 899 | } |
| 900 | |
| 901 | /* Convert the returned sample in lua value. */ |
| 902 | hlua_smp2lua(L, &smp); |
| 903 | return 1; |
| 904 | } |
| 905 | |
Thierry FOURNIER | 24f3353 | 2015-01-23 12:13:00 +0100 | [diff] [blame] | 906 | /* This function is used as a calback of a task. It is called by the |
| 907 | * HAProxy task subsystem when the task is awaked. The LUA runtime can |
| 908 | * return an E_AGAIN signal, the emmiter of this signal must set a |
| 909 | * signal to wake the task. |
| 910 | */ |
| 911 | static struct task *hlua_process_task(struct task *task) |
| 912 | { |
| 913 | struct hlua *hlua = task->context; |
| 914 | enum hlua_exec status; |
| 915 | |
| 916 | /* We need to remove the task from the wait queue before executing |
| 917 | * the Lua code because we don't know if it needs to wait for |
| 918 | * another timer or not in the case of E_AGAIN. |
| 919 | */ |
| 920 | task_delete(task); |
| 921 | |
| 922 | /* Execute the Lua code. */ |
| 923 | status = hlua_ctx_resume(hlua, 1); |
| 924 | |
| 925 | switch (status) { |
| 926 | /* finished or yield */ |
| 927 | case HLUA_E_OK: |
| 928 | hlua_ctx_destroy(hlua); |
| 929 | task_delete(task); |
| 930 | task_free(task); |
| 931 | break; |
| 932 | |
| 933 | case HLUA_E_AGAIN: /* co process wake me later. */ |
| 934 | break; |
| 935 | |
| 936 | /* finished with error. */ |
| 937 | case HLUA_E_ERRMSG: |
| 938 | send_log(NULL, LOG_ERR, "Lua task: %s.", lua_tostring(hlua->T, -1)); |
| 939 | if (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) |
| 940 | Alert("Lua task: %s.\n", lua_tostring(hlua->T, -1)); |
| 941 | hlua_ctx_destroy(hlua); |
| 942 | task_delete(task); |
| 943 | task_free(task); |
| 944 | break; |
| 945 | |
| 946 | case HLUA_E_ERR: |
| 947 | default: |
| 948 | send_log(NULL, LOG_ERR, "Lua task: unknown error."); |
| 949 | if (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) |
| 950 | Alert("Lua task: unknown error.\n"); |
| 951 | hlua_ctx_destroy(hlua); |
| 952 | task_delete(task); |
| 953 | task_free(task); |
| 954 | break; |
| 955 | } |
| 956 | return NULL; |
| 957 | } |
| 958 | |
Thierry FOURNIER | a4a0f3d | 2015-01-23 12:08:30 +0100 | [diff] [blame] | 959 | /* This function is an LUA binding that register LUA function to be |
| 960 | * executed after the HAProxy configuration parsing and before the |
| 961 | * HAProxy scheduler starts. This function expect only one LUA |
| 962 | * argument that is a function. This function returns nothing, but |
| 963 | * throws if an error is encountered. |
| 964 | */ |
| 965 | __LJMP static int hlua_register_init(lua_State *L) |
| 966 | { |
| 967 | struct hlua_init_function *init; |
| 968 | int ref; |
| 969 | |
| 970 | MAY_LJMP(check_args(L, 1, "register_init")); |
| 971 | |
| 972 | ref = MAY_LJMP(hlua_checkfunction(L, 1)); |
| 973 | |
| 974 | init = malloc(sizeof(*init)); |
| 975 | if (!init) |
| 976 | WILL_LJMP(luaL_error(L, "lua out of memory error.")); |
| 977 | |
| 978 | init->function_ref = ref; |
| 979 | LIST_ADDQ(&hlua_init_functions, &init->l); |
| 980 | return 0; |
| 981 | } |
| 982 | |
Thierry FOURNIER | 24f3353 | 2015-01-23 12:13:00 +0100 | [diff] [blame] | 983 | /* This functio is an LUA binding. It permits to register a task |
| 984 | * executed in parallel of the main HAroxy activity. The task is |
| 985 | * created and it is set in the HAProxy scheduler. It can be called |
| 986 | * from the "init" section, "post init" or during the runtime. |
| 987 | * |
| 988 | * Lua prototype: |
| 989 | * |
| 990 | * <none> core.register_task(<function>) |
| 991 | */ |
| 992 | static int hlua_register_task(lua_State *L) |
| 993 | { |
| 994 | struct hlua *hlua; |
| 995 | struct task *task; |
| 996 | int ref; |
| 997 | |
| 998 | MAY_LJMP(check_args(L, 1, "register_task")); |
| 999 | |
| 1000 | ref = MAY_LJMP(hlua_checkfunction(L, 1)); |
| 1001 | |
| 1002 | hlua = malloc(sizeof(*hlua)); |
| 1003 | if (!hlua) |
| 1004 | WILL_LJMP(luaL_error(L, "lua out of memory error.")); |
| 1005 | |
| 1006 | task = task_new(); |
| 1007 | task->context = hlua; |
| 1008 | task->process = hlua_process_task; |
| 1009 | |
| 1010 | if (!hlua_ctx_init(hlua, task)) |
| 1011 | WILL_LJMP(luaL_error(L, "lua out of memory error.")); |
| 1012 | |
| 1013 | /* Restore the function in the stack. */ |
| 1014 | lua_rawgeti(hlua->T, LUA_REGISTRYINDEX, ref); |
| 1015 | hlua->nargs = 0; |
| 1016 | |
| 1017 | /* Schedule task. */ |
| 1018 | task_schedule(task, now_ms); |
| 1019 | |
| 1020 | return 0; |
| 1021 | } |
| 1022 | |
Thierry FOURNIER | 6c9b52c | 2015-01-23 15:57:06 +0100 | [diff] [blame] | 1023 | /* This function is called by the main configuration key "lua-load". It loads and |
| 1024 | * execute an lua file during the parsing of the HAProxy configuration file. It is |
| 1025 | * the main lua entry point. |
| 1026 | * |
| 1027 | * This funtion runs with the HAProxy keywords API. It returns -1 if an error is |
| 1028 | * occured, otherwise it returns 0. |
| 1029 | * |
| 1030 | * In some error case, LUA set an error message in top of the stack. This function |
| 1031 | * returns this error message in the HAProxy logs and pop it from the stack. |
| 1032 | */ |
| 1033 | static int hlua_load(char **args, int section_type, struct proxy *curpx, |
| 1034 | struct proxy *defpx, const char *file, int line, |
| 1035 | char **err) |
| 1036 | { |
| 1037 | int error; |
| 1038 | |
| 1039 | /* Just load and compile the file. */ |
| 1040 | error = luaL_loadfile(gL.T, args[1]); |
| 1041 | if (error) { |
| 1042 | memprintf(err, "error in lua file '%s': %s", args[1], lua_tostring(gL.T, -1)); |
| 1043 | lua_pop(gL.T, 1); |
| 1044 | return -1; |
| 1045 | } |
| 1046 | |
| 1047 | /* If no syntax error where detected, execute the code. */ |
| 1048 | error = lua_pcall(gL.T, 0, LUA_MULTRET, 0); |
| 1049 | switch (error) { |
| 1050 | case LUA_OK: |
| 1051 | break; |
| 1052 | case LUA_ERRRUN: |
| 1053 | memprintf(err, "lua runtime error: %s\n", lua_tostring(gL.T, -1)); |
| 1054 | lua_pop(gL.T, 1); |
| 1055 | return -1; |
| 1056 | case LUA_ERRMEM: |
| 1057 | memprintf(err, "lua out of memory error\n"); |
| 1058 | return -1; |
| 1059 | case LUA_ERRERR: |
| 1060 | memprintf(err, "lua message handler error: %s\n", lua_tostring(gL.T, -1)); |
| 1061 | lua_pop(gL.T, 1); |
| 1062 | return -1; |
| 1063 | case LUA_ERRGCMM: |
| 1064 | memprintf(err, "lua garbage collector error: %s\n", lua_tostring(gL.T, -1)); |
| 1065 | lua_pop(gL.T, 1); |
| 1066 | return -1; |
| 1067 | default: |
| 1068 | memprintf(err, "lua unknonwn error: %s\n", lua_tostring(gL.T, -1)); |
| 1069 | lua_pop(gL.T, 1); |
| 1070 | return -1; |
| 1071 | } |
| 1072 | |
| 1073 | return 0; |
| 1074 | } |
| 1075 | |
| 1076 | /* configuration keywords declaration */ |
| 1077 | static struct cfg_kw_list cfg_kws = {{ },{ |
| 1078 | { CFG_GLOBAL, "lua-load", hlua_load }, |
| 1079 | { 0, NULL, NULL }, |
| 1080 | }}; |
| 1081 | |
Thierry FOURNIER | a4a0f3d | 2015-01-23 12:08:30 +0100 | [diff] [blame] | 1082 | int hlua_post_init() |
| 1083 | { |
| 1084 | struct hlua_init_function *init; |
| 1085 | const char *msg; |
| 1086 | enum hlua_exec ret; |
| 1087 | |
| 1088 | list_for_each_entry(init, &hlua_init_functions, l) { |
| 1089 | lua_rawgeti(gL.T, LUA_REGISTRYINDEX, init->function_ref); |
| 1090 | ret = hlua_ctx_resume(&gL, 0); |
| 1091 | switch (ret) { |
| 1092 | case HLUA_E_OK: |
| 1093 | lua_pop(gL.T, -1); |
| 1094 | return 1; |
| 1095 | case HLUA_E_AGAIN: |
| 1096 | Alert("lua init: yield not allowed.\n"); |
| 1097 | return 0; |
| 1098 | case HLUA_E_ERRMSG: |
| 1099 | msg = lua_tostring(gL.T, -1); |
| 1100 | Alert("lua init: %s.\n", msg); |
| 1101 | return 0; |
| 1102 | case HLUA_E_ERR: |
| 1103 | default: |
| 1104 | Alert("lua init: unknown runtime error.\n"); |
| 1105 | return 0; |
| 1106 | } |
| 1107 | } |
| 1108 | return 1; |
| 1109 | } |
| 1110 | |
Thierry FOURNIER | 6f1fd48 | 2015-01-23 14:06:13 +0100 | [diff] [blame] | 1111 | void hlua_init(void) |
| 1112 | { |
Thierry FOURNIER | 2ba18a2 | 2015-01-23 14:07:08 +0100 | [diff] [blame] | 1113 | int i; |
Thierry FOURNIER | d0fa538 | 2015-02-16 20:14:51 +0100 | [diff] [blame^] | 1114 | int idx; |
| 1115 | struct sample_fetch *sf; |
| 1116 | struct hlua_sample_fetch *hsf; |
| 1117 | char *p; |
Thierry FOURNIER | 2ba18a2 | 2015-01-23 14:07:08 +0100 | [diff] [blame] | 1118 | |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 1119 | /* Initialise com signals pool session. */ |
| 1120 | pool2_hlua_com = create_pool("hlua_com", sizeof(struct hlua_com), MEM_F_SHARED); |
| 1121 | |
Thierry FOURNIER | 6c9b52c | 2015-01-23 15:57:06 +0100 | [diff] [blame] | 1122 | /* Register configuration keywords. */ |
| 1123 | cfg_register_keywords(&cfg_kws); |
| 1124 | |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 1125 | /* Init main lua stack. */ |
| 1126 | gL.Mref = LUA_REFNIL; |
| 1127 | gL.state = HLUA_STOP; |
Thierry FOURNIER | 9ff7e6e | 2015-01-23 11:08:20 +0100 | [diff] [blame] | 1128 | LIST_INIT(&gL.com); |
Thierry FOURNIER | 380d093 | 2015-01-23 14:27:52 +0100 | [diff] [blame] | 1129 | gL.T = luaL_newstate(); |
| 1130 | hlua_sethlua(&gL); |
| 1131 | gL.Tref = LUA_REFNIL; |
| 1132 | gL.task = NULL; |
| 1133 | |
| 1134 | /* Initialise lua. */ |
| 1135 | luaL_openlibs(gL.T); |
Thierry FOURNIER | 2ba18a2 | 2015-01-23 14:07:08 +0100 | [diff] [blame] | 1136 | |
| 1137 | /* |
| 1138 | * |
| 1139 | * Create "core" object. |
| 1140 | * |
| 1141 | */ |
| 1142 | |
| 1143 | /* This integer entry is just used as base value for the object "core". */ |
| 1144 | lua_pushinteger(gL.T, 0); |
| 1145 | |
| 1146 | /* Create and fill the metatable. */ |
| 1147 | lua_newtable(gL.T); |
| 1148 | |
| 1149 | /* Create and fill the __index entry. */ |
| 1150 | lua_pushstring(gL.T, "__index"); |
| 1151 | lua_newtable(gL.T); |
| 1152 | |
| 1153 | /* Push the loglevel constants. */ |
| 1154 | for (i=0; i<NB_LOG_LEVELS; i++) |
| 1155 | hlua_class_const_int(gL.T, log_levels[i], i); |
| 1156 | |
Thierry FOURNIER | a4a0f3d | 2015-01-23 12:08:30 +0100 | [diff] [blame] | 1157 | /* Register special functions. */ |
| 1158 | hlua_class_function(gL.T, "register_init", hlua_register_init); |
Thierry FOURNIER | 24f3353 | 2015-01-23 12:13:00 +0100 | [diff] [blame] | 1159 | hlua_class_function(gL.T, "register_task", hlua_register_task); |
Thierry FOURNIER | a4a0f3d | 2015-01-23 12:08:30 +0100 | [diff] [blame] | 1160 | |
Thierry FOURNIER | 2ba18a2 | 2015-01-23 14:07:08 +0100 | [diff] [blame] | 1161 | /* Store the table __index in the metable. */ |
| 1162 | lua_settable(gL.T, -3); |
| 1163 | |
| 1164 | /* Register previous table in the registry with named entry. */ |
| 1165 | lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */ |
| 1166 | lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_CORE); /* register class session. */ |
| 1167 | |
| 1168 | /* Register previous table in the registry with reference. */ |
| 1169 | lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */ |
| 1170 | class_core_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */ |
| 1171 | |
| 1172 | /* Create new object with class Core. */ |
| 1173 | lua_setmetatable(gL.T, -2); |
| 1174 | lua_setglobal(gL.T, "core"); |
Thierry FOURNIER | 65f34c6 | 2015-02-16 20:11:43 +0100 | [diff] [blame] | 1175 | |
| 1176 | /* |
| 1177 | * |
| 1178 | * Register class TXN |
| 1179 | * |
| 1180 | */ |
| 1181 | |
| 1182 | /* Create and fill the metatable. */ |
| 1183 | lua_newtable(gL.T); |
| 1184 | |
| 1185 | /* Create and fille the __index entry. */ |
| 1186 | lua_pushstring(gL.T, "__index"); |
| 1187 | lua_newtable(gL.T); |
| 1188 | |
Thierry FOURNIER | d0fa538 | 2015-02-16 20:14:51 +0100 | [diff] [blame^] | 1189 | /* Browse existing fetches and create the associated |
| 1190 | * object method. |
| 1191 | */ |
| 1192 | sf = NULL; |
| 1193 | while ((sf = sample_fetch_getnext(sf, &idx)) != NULL) { |
| 1194 | |
| 1195 | /* Dont register the keywork if the arguments check function are |
| 1196 | * not safe during the runtime. |
| 1197 | */ |
| 1198 | if ((sf->val_args != NULL) && |
| 1199 | (sf->val_args != val_payload_lv) && |
| 1200 | (sf->val_args != val_hdr)) |
| 1201 | continue; |
| 1202 | |
| 1203 | /* gL.Tua doesn't support '.' and '-' in the function names, replace it |
| 1204 | * by an underscore. |
| 1205 | */ |
| 1206 | strncpy(trash.str, sf->kw, trash.size); |
| 1207 | trash.str[trash.size - 1] = '\0'; |
| 1208 | for (p = trash.str; *p; p++) |
| 1209 | if (*p == '.' || *p == '-' || *p == '+') |
| 1210 | *p = '_'; |
| 1211 | |
| 1212 | /* Register the function. */ |
| 1213 | lua_pushstring(gL.T, trash.str); |
| 1214 | hsf = lua_newuserdata(gL.T, sizeof(struct hlua_sample_fetch)); |
| 1215 | hsf->f = sf; |
| 1216 | lua_pushcclosure(gL.T, hlua_run_sample_fetch, 1); |
| 1217 | lua_settable(gL.T, -3); |
| 1218 | } |
| 1219 | |
Thierry FOURNIER | 05c0b8a | 2015-02-25 11:43:21 +0100 | [diff] [blame] | 1220 | /* Register Lua functions. */ |
| 1221 | hlua_class_function(gL.T, "set_priv", hlua_setpriv); |
| 1222 | hlua_class_function(gL.T, "get_priv", hlua_getpriv); |
| 1223 | |
Thierry FOURNIER | 65f34c6 | 2015-02-16 20:11:43 +0100 | [diff] [blame] | 1224 | lua_settable(gL.T, -3); |
| 1225 | |
| 1226 | /* Register previous table in the registry with reference and named entry. */ |
| 1227 | lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */ |
| 1228 | lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_TXN); /* register class session. */ |
| 1229 | class_txn_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */ |
Thierry FOURNIER | 6f1fd48 | 2015-01-23 14:06:13 +0100 | [diff] [blame] | 1230 | } |