* is like a normal client that bypasses all the slow I/O paths.
*
* Note: in this function we do not do any sanity check as the reply is
- * generated by Redis directly. This allows use to go faster.
+ * generated by Redis directly. This allows us to go faster.
* The reply string can be altered during the parsing as it is discared
* after the conversion is completed.
*
lua_settable(lua,-3);
}
+/* Sort the array currently in the stack. We do this to make the output
+ * of commands like KEYS or SMEMBERS something deterministic when called
+ * from Lua (to play well with AOf/replication).
+ *
+ * The array is sorted using table.sort itself, and assuming all the
+ * list elements are strings. */
+void luaSortArray(lua_State *lua) {
+ /* Initial Stack: array */
+ lua_getglobal(lua,"table");
+ lua_pushstring(lua,"sort");
+ lua_gettable(lua,-2); /* Stack: array, table, table.sort */
+ lua_pushvalue(lua,-3); /* Stack: array, table, table.sort, array */
+ if (lua_pcall(lua,1,0,0)) {
+ /* Stack: array, table, error */
+
+ /* We are not interested in the error, we assume that the problem is
+ * that there are 'false' elements inside the array, so we try
+ * again with a slower function but able to handle this case, that
+ * is: table.sort(table, __redis__compare_helper) */
+ lua_pop(lua,1); /* Stack: array, table */
+ lua_pushstring(lua,"sort"); /* Stack: array, table, sort */
+ lua_gettable(lua,-2); /* Stack: array, table, table.sort */
+ lua_pushvalue(lua,-3); /* Stack: array, table, table.sort, array */
+ lua_getglobal(lua,"__redis__compare_helper");
+ /* Stack: array, table, table.sort, array, __redis__compare_helper */
+ lua_call(lua,2,0);
+ }
+ /* Stack: array (sorted), table */
+ lua_pop(lua,1); /* Stack: array (sorted) */
+}
+
int luaRedisGenericCommand(lua_State *lua, int raise_error) {
int j, argc = lua_gettop(lua);
struct redisCommand *cmd;
goto cleanup;
}
+ /* There are commands that are not allowed inside scripts. */
if (cmd->flags & REDIS_CMD_NOSCRIPT) {
luaPushError(lua, "This Redis command is not allowed from scripts");
goto cleanup;
}
- if (cmd->flags & REDIS_CMD_WRITE && server.lua_random_dirty) {
- luaPushError(lua,
- "Write commands not allowed after non deterministic commands");
- goto cleanup;
+ /* Write commands are forbidden against read-only slaves, or if a
+ * command marked as non-deterministic was already called in the context
+ * of this script. */
+ if (cmd->flags & REDIS_CMD_WRITE) {
+ if (server.lua_random_dirty) {
+ luaPushError(lua,
+ "Write commands not allowed after non deterministic commands");
+ goto cleanup;
+ } else if (server.masterhost && server.repl_slave_ro &&
+ !(server.lua_caller->flags & REDIS_MASTER))
+ {
+ luaPushError(lua, shared.roslaveerr->ptr);
+ goto cleanup;
+ } else if (server.stop_writes_on_bgsave_err &&
+ server.saveparamslen > 0 &&
+ server.lastbgsave_status == REDIS_ERR)
+ {
+ luaPushError(lua, shared.bgsaveerr->ptr);
+ goto cleanup;
+ }
+ }
+
+ /* If we reached the memory limit configured via maxmemory, commands that
+ * could enlarge the memory usage are not allowed, but only if this is the
+ * first write in the context of this script, otherwise we can't stop
+ * in the middle. */
+ if (server.maxmemory && server.lua_write_dirty == 0 &&
+ (cmd->flags & REDIS_CMD_DENYOOM))
+ {
+ if (freeMemoryIfNeeded() == REDIS_ERR) {
+ luaPushError(lua, shared.oomerr->ptr);
+ goto cleanup;
+ }
}
if (cmd->flags & REDIS_CMD_RANDOM) server.lua_random_dirty = 1;
if (cmd->flags & REDIS_CMD_WRITE) server.lua_write_dirty = 1;
/* Run the command */
- cmd->proc(c);
+ c->cmd = cmd;
+ call(c,REDIS_CALL_SLOWLOG | REDIS_CALL_STATS);
/* Convert the result of the Redis command into a suitable Lua type.
* The first thing we need is to create a single string from the client
}
if (raise_error && reply[0] != '-') raise_error = 0;
redisProtocolToLuaType(lua,reply);
+ /* Sort the output array if needed, assuming it is a non-null multi bulk
+ * reply as expected. */
+ if ((cmd->flags & REDIS_CMD_SORT_FOR_SCRIPT) &&
+ (reply[0] == '*' && reply[1] != '-')) {
+ /* Skip this step if command is SORT but output was already sorted */
+ if (cmd->proc != sortCommand || server.sort_dontsort)
+ luaSortArray(lua);
+ }
sdsfree(reply);
cleanup:
}
LUALIB_API int (luaopen_cjson) (lua_State *L);
+LUALIB_API int (luaopen_struct) (lua_State *L);
+LUALIB_API int (luaopen_cmsgpack) (lua_State *L);
void luaLoadLibraries(lua_State *lua) {
luaLoadLib(lua, "", luaopen_base);
luaLoadLib(lua, LUA_STRLIBNAME, luaopen_string);
luaLoadLib(lua, LUA_MATHLIBNAME, luaopen_math);
luaLoadLib(lua, LUA_DBLIBNAME, luaopen_debug);
- luaLoadLib(lua, "cjson", luaopen_cjson);
+ luaLoadLib(lua, "cjson", luaopen_cjson);
+ luaLoadLib(lua, "struct", luaopen_struct);
+ luaLoadLib(lua, "cmsgpack", luaopen_cmsgpack);
#if 0 /* Stuff that we don't load currently, for sandboxing concerns. */
luaLoadLib(lua, LUA_LOADLIBNAME, luaopen_package);
lua_setglobal(lua,"math");
+ /* Add a helper funciton that we use to sort the multi bulk output of non
+ * deterministic commands, when containing 'false' elements. */
+ {
+ char *compare_func = "function __redis__compare_helper(a,b)\n"
+ " if a == false then a = '' end\n"
+ " if b == false then b = '' end\n"
+ " return a<b\n"
+ "end\n";
+ luaL_loadbuffer(lua,compare_func,strlen(compare_func),"cmp_func_def");
+ lua_pcall(lua,0,0,0);
+ }
+
/* Create the (non connected) client that we use to execute Redis commands
* inside the Lua interpreter.
* Note: there is no need to create it again when this function is called
projects / redis.git / blobdiff