webmcp: libraries/mondelefant/mondelefant

webmcp

annotate libraries/mondelefant/mondelefant_native.c @ 417:03f4f905a41a

Renamed "columns" property to "_col"

author	jbe
date	Sat Jan 09 19:40:04 2016 +0100 (2016-01-09)
parents	046927075270
children	4ae9850d6954

rev	line source
jbe/bsw@0	1 #include <lua.h>
jbe/bsw@0	2 #include <lauxlib.h>
jbe/bsw@0	3 #include <libpq-fe.h>
jbe/bsw@0	4 #include <postgres.h>
jbe/bsw@0	5 #include <catalog/pg_type.h>
jbe/bsw@0	6 #include <stdint.h>
jbe@393	7 #include <time.h>
jbe/bsw@0	8
jbe@23	9 // NOTE: Comments with format "// <number>" denote the Lua stack position
jbe@23	10
jbe@23	11 // prefix for all Lua registry entries of this library:
jbe@402	12 #define MONDELEFANT_REGKEY "mondelefant_"
jbe/bsw@0	13
jbe@23	14 // registry key of module "mondelefant_native":
jbe@23	15 #define MONDELEFANT_MODULE_REGKEY (MONDELEFANT_REGKEY "module")
jbe@23	16 // registry key of meta-table for database connections:
jbe@23	17 #define MONDELEFANT_CONN_MT_REGKEY (MONDELEFANT_REGKEY "connection")
jbe@23	18 // registry key of meta-table for database result lists and objects:
jbe@23	19 #define MONDELEFANT_RESULT_MT_REGKEY (MONDELEFANT_REGKEY "result")
jbe@23	20 // registry key of meta-table for database error objects:
jbe@23	21 #define MONDELEFANT_ERROROBJECT_MT_REGKEY (MONDELEFANT_REGKEY "errorobject")
jbe@23	22 // registry key of meta-table for models (named classes here):
jbe@23	23 #define MONDELEFANT_CLASS_MT_REGKEY (MONDELEFANT_REGKEY "class")
jbe@23	24 // registry key of default prototype for models/classes:
jbe@23	25 #define MONDELEFANT_CLASS_PROTO_REGKEY (MONDELEFANT_REGKEY "class_proto")
jbe@416	26 // registry key of meta-table for column proxy:
jbe@416	27 #define MONDELEFANT_COLUMNS_MT_REGKEY (MONDELEFANT_REGKEY "columns")
jbe@416	28 // table (lightuserdata) key to store result object in column proxy:
jbe@416	29 // (address of struct used as unique reference)
jbe@416	30 #define MONDELEFANT_COLUMNS_RESULT_LUKEY ((void *)&mondelefant_columns_result_lukey_dummy)
jbe@416	31
jbe@416	32 // dummy variable for MONDELEFANT_COLUMNS_RESULT_LUKEY reference:
jbe@416	33 char mondelefant_columns_result_lukey_dummy;
jbe/bsw@0	34
jbe@23	35 // C-structure for database connection userdata:
jbe/bsw@0	36 typedef struct {
jbe/bsw@0	37 PGconn *pgconn;
jbe/bsw@0	38 int server_encoding;
jbe@408	39 void *todo_PQfreemem;
jbe@408	40 PGresult *todo_PQclear;
jbe/bsw@0	41 } mondelefant_conn_t;
jbe@23	42 #define MONDELEFANT_SERVER_ENCODING_ASCII 0
jbe@23	43 #define MONDELEFANT_SERVER_ENCODING_UTF8 1
jbe/bsw@0	44
jbe@23	45 // transform codepoint-position to byte-position for a given UTF-8 string:
jbe/bsw@0	46 static size_t utf8_position_to_byte(const char *str, size_t utf8pos) {
jbe/bsw@0	47 size_t bytepos;
jbe/bsw@0	48 for (bytepos = 0; utf8pos > 0; bytepos++) {
jbe/bsw@0	49 uint8_t c;
jbe/bsw@0	50 c = ((const uint8_t *)str)[bytepos];
jbe/bsw@0	51 if (!c) break;
jbe/bsw@0	52 if (c <= 0x7f \|\| c >= 0xc0) utf8pos--;
jbe/bsw@0	53 }
jbe/bsw@0	54 return bytepos;
jbe/bsw@0	55 }
jbe/bsw@0	56
jbe@23	57 // PostgreSQL's OID for binary data type (bytea):
jbe/bsw@0	58 #define MONDELEFANT_POSTGRESQL_BINARY_OID ((Oid)17)
jbe/bsw@0	59
jbe@23	60 // mapping a PostgreSQL type given by its OID to a string identifier:
jbe/bsw@0	61 static const char *mondelefant_oid_to_typestr(Oid oid) {
jbe/bsw@0	62 switch (oid) {
jbe/bsw@0	63 case 16: return "bool";
jbe/bsw@0	64 case 17: return "bytea";
jbe/bsw@0	65 case 18: return "char";
jbe/bsw@0	66 case 19: return "name";
jbe/bsw@0	67 case 20: return "int8";
jbe/bsw@0	68 case 21: return "int2";
jbe/bsw@0	69 case 23: return "int4";
jbe/bsw@0	70 case 25: return "text";
jbe/bsw@0	71 case 26: return "oid";
jbe/bsw@0	72 case 27: return "tid";
jbe/bsw@0	73 case 28: return "xid";
jbe/bsw@0	74 case 29: return "cid";
jbe@176	75 case 114: return "json";
jbe/bsw@0	76 case 600: return "point";
jbe/bsw@0	77 case 601: return "lseg";
jbe/bsw@0	78 case 602: return "path";
jbe/bsw@0	79 case 603: return "box";
jbe/bsw@0	80 case 604: return "polygon";
jbe/bsw@0	81 case 628: return "line";
jbe/bsw@0	82 case 700: return "float4";
jbe/bsw@0	83 case 701: return "float8";
jbe/bsw@0	84 case 705: return "unknown";
jbe/bsw@0	85 case 718: return "circle";
jbe/bsw@0	86 case 790: return "money";
jbe/bsw@0	87 case 829: return "macaddr";
jbe/bsw@0	88 case 869: return "inet";
jbe/bsw@0	89 case 650: return "cidr";
jbe/bsw@0	90 case 1042: return "bpchar";
jbe/bsw@0	91 case 1043: return "varchar";
jbe/bsw@0	92 case 1082: return "date";
jbe/bsw@0	93 case 1083: return "time";
jbe/bsw@0	94 case 1114: return "timestamp";
jbe/bsw@0	95 case 1184: return "timestamptz";
jbe/bsw@0	96 case 1186: return "interval";
jbe/bsw@0	97 case 1266: return "timetz";
jbe/bsw@0	98 case 1560: return "bit";
jbe/bsw@0	99 case 1562: return "varbit";
jbe/bsw@0	100 case 1700: return "numeric";
jbe@176	101 case 3802: return "jsonb";
jbe/bsw@0	102 default: return NULL;
jbe/bsw@0	103 }
jbe/bsw@0	104 }
jbe/bsw@0	105
jbe@23	106 // This library maps PostgreSQL's error codes to CamelCase string
jbe@23	107 // identifiers, which consist of CamelCase identifiers and are seperated
jbe@23	108 // by dots (".") (no leading or trailing dots).
jbe@23	109 // There are additional error identifiers which do not have a corresponding
jbe@23	110 // PostgreSQL error associated with it.
jbe@23	111
jbe@23	112 // matching start of local variable 'pgcode' against string 'incode',
jbe@23	113 // returning string 'outcode' on match:
jbe/bsw@0	114 #define mondelefant_errcode_item(incode, outcode) \
jbe/bsw@0	115 if (!strncmp(pgcode, (incode), strlen(incode))) return outcode; else
jbe/bsw@0	116
jbe@23	117 // additional error identifiers without corresponding PostgreSQL error:
jbe/bsw@0	118 #define MONDELEFANT_ERRCODE_UNKNOWN "unknown"
jbe/bsw@0	119 #define MONDELEFANT_ERRCODE_CONNECTION "ConnectionException"
jbe/bsw@0	120 #define MONDELEFANT_ERRCODE_RESULTCOUNT_LOW "WrongResultSetCount.ResultSetMissing"
jbe/bsw@0	121 #define MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH "WrongResultSetCount.TooManyResults"
jbe/bsw@0	122 #define MONDELEFANT_ERRCODE_QUERY1_NO_ROWS "NoData.OneRowExpected"
jbe/bsw@0	123 #define MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS "CardinalityViolation.OneRowExpected"
jbe/bsw@0	124
jbe@23	125 // mapping PostgreSQL error code to error code as returned by this library:
jbe/bsw@0	126 static const char mondelefant_translate_errcode(const char pgcode) {
jbe/bsw@0	127 if (!pgcode) abort(); // should not happen
jbe/bsw@0	128 mondelefant_errcode_item("02", "NoData")
jbe/bsw@0	129 mondelefant_errcode_item("03", "SqlStatementNotYetComplete")
jbe/bsw@0	130 mondelefant_errcode_item("08", "ConnectionException")
jbe/bsw@0	131 mondelefant_errcode_item("09", "TriggeredActionException")
jbe/bsw@0	132 mondelefant_errcode_item("0A", "FeatureNotSupported")
jbe/bsw@0	133 mondelefant_errcode_item("0B", "InvalidTransactionInitiation")
jbe/bsw@0	134 mondelefant_errcode_item("0F", "LocatorException")
jbe/bsw@0	135 mondelefant_errcode_item("0L", "InvalidGrantor")
jbe/bsw@0	136 mondelefant_errcode_item("0P", "InvalidRoleSpecification")
jbe/bsw@0	137 mondelefant_errcode_item("21", "CardinalityViolation")
jbe/bsw@0	138 mondelefant_errcode_item("22", "DataException")
jbe/bsw@0	139 mondelefant_errcode_item("23001", "IntegrityConstraintViolation.RestrictViolation")
jbe/bsw@0	140 mondelefant_errcode_item("23502", "IntegrityConstraintViolation.NotNullViolation")
jbe/bsw@0	141 mondelefant_errcode_item("23503", "IntegrityConstraintViolation.ForeignKeyViolation")
jbe/bsw@0	142 mondelefant_errcode_item("23505", "IntegrityConstraintViolation.UniqueViolation")
jbe/bsw@0	143 mondelefant_errcode_item("23514", "IntegrityConstraintViolation.CheckViolation")
jbe/bsw@0	144 mondelefant_errcode_item("23", "IntegrityConstraintViolation")
jbe/bsw@0	145 mondelefant_errcode_item("24", "InvalidCursorState")
jbe/bsw@0	146 mondelefant_errcode_item("25", "InvalidTransactionState")
jbe/bsw@0	147 mondelefant_errcode_item("26", "InvalidSqlStatementName")
jbe/bsw@0	148 mondelefant_errcode_item("27", "TriggeredDataChangeViolation")
jbe/bsw@0	149 mondelefant_errcode_item("28", "InvalidAuthorizationSpecification")
jbe/bsw@0	150 mondelefant_errcode_item("2B", "DependentPrivilegeDescriptorsStillExist")
jbe/bsw@0	151 mondelefant_errcode_item("2D", "InvalidTransactionTermination")
jbe/bsw@0	152 mondelefant_errcode_item("2F", "SqlRoutineException")
jbe/bsw@0	153 mondelefant_errcode_item("34", "InvalidCursorName")
jbe/bsw@0	154 mondelefant_errcode_item("38", "ExternalRoutineException")
jbe/bsw@0	155 mondelefant_errcode_item("39", "ExternalRoutineInvocationException")
jbe/bsw@0	156 mondelefant_errcode_item("3B", "SavepointException")
jbe/bsw@0	157 mondelefant_errcode_item("3D", "InvalidCatalogName")
jbe/bsw@0	158 mondelefant_errcode_item("3F", "InvalidSchemaName")
jbe/bsw@0	159 mondelefant_errcode_item("40", "TransactionRollback")
jbe/bsw@0	160 mondelefant_errcode_item("42", "SyntaxErrorOrAccessRuleViolation")
jbe/bsw@0	161 mondelefant_errcode_item("44", "WithCheckOptionViolation")
jbe/bsw@0	162 mondelefant_errcode_item("53", "InsufficientResources")
jbe/bsw@0	163 mondelefant_errcode_item("54", "ProgramLimitExceeded")
jbe/bsw@0	164 mondelefant_errcode_item("55", "ObjectNotInPrerequisiteState")
jbe/bsw@0	165 mondelefant_errcode_item("57", "OperatorIntervention")
jbe/bsw@0	166 mondelefant_errcode_item("58", "SystemError")
jbe/bsw@0	167 mondelefant_errcode_item("F0", "ConfigurationFileError")
jbe/bsw@0	168 mondelefant_errcode_item("P0", "PlpgsqlError")
jbe/bsw@0	169 mondelefant_errcode_item("XX", "InternalError")
jbe/bsw@0	170 return "unknown";
jbe/bsw@0	171 }
jbe/bsw@0	172
jbe@23	173 // C-function, checking if a given error code (as defined by this library)
jbe@23	174 // is belonging to a certain class of errors (strings are equal or error
jbe@23	175 // code begins with error class followed by a dot):
jbe/bsw@0	176 static int mondelefant_check_error_class(
jbe/bsw@0	177 const char errcode, const char errclass
jbe/bsw@0	178 ) {
jbe/bsw@0	179 size_t i = 0;
jbe/bsw@0	180 while (1) {
jbe/bsw@0	181 if (errclass[i] == 0) {
jbe/bsw@0	182 if (errcode[i] == 0 \|\| errcode[i] == '.') return 1;
jbe/bsw@0	183 else return 0;
jbe/bsw@0	184 }
jbe/bsw@0	185 if (errcode[i] != errclass[i]) return 0;
jbe/bsw@0	186 i++;
jbe/bsw@0	187 }
jbe/bsw@0	188 }
jbe/bsw@0	189
jbe@23	190 // pushing first line of a string on Lua's stack (without trailing CR/LF):
jbe/bsw@0	191 static void mondelefant_push_first_line(lua_State L, const char str) {
jbe/bsw@0	192 size_t i = 0;
jbe/bsw@0	193 if (!str) abort(); // should not happen
jbe/bsw@0	194 while (1) {
jbe@397	195 char c = str[i];
jbe@397	196 if (c == '\n' \|\| c == '\r' \|\| c == 0) {
jbe@397	197 lua_pushlstring(L, str, i);
jbe@397	198 return;
jbe@397	199 }
jbe/bsw@0	200 i++;
jbe@397	201 }
jbe/bsw@0	202 }
jbe/bsw@0	203
jbe@23	204 // "connect" function of library, which establishes a database connection
jbe@23	205 // and returns a database connection handle:
jbe/bsw@0	206 static int mondelefant_connect(lua_State *L) {
jbe@23	207 const char *conninfo; // string for PQconnectdb function
jbe@23	208 mondelefant_conn_t *conn; // C-structure for userdata
jbe@402	209 // check if string is given as first argument:
jbe@402	210 if (lua_type(L, 1) != LUA_TSTRING) {
jbe@402	211 // expect a table as first argument if no string is given:
jbe@402	212 luaL_checktype(L, 1, LUA_TTABLE);
jbe@406	213 // extract conninfo string for PQconnectdb if possible:
jbe@406	214 lua_getfield(L, 1, "conninfo");
jbe@406	215 if (!lua_isnil(L, -1)) {
jbe@402	216 // if yes, use that value but check its type:
jbe@406	217 luaL_argcheck(L, lua_type(L, -1) == LUA_TSTRING, 1, "\"conninfo\" value is not a string");
jbe@402	218 } else {
jbe@402	219 // otherwise assemble conninfo string from the named options:
jbe@402	220 luaL_Buffer buf;
jbe@40	221 int need_seperator = 0;
jbe@402	222 const char *value;
jbe@402	223 size_t value_len;
jbe@402	224 size_t value_pos = 0;
jbe@402	225 lua_settop(L, 1);
jbe@402	226 lua_pushnil(L); // slot for key at stack position 2
jbe@402	227 lua_pushnil(L); // slot for value at stack position 3
jbe@402	228 luaL_buffinit(L, &buf);
jbe@40	229 while (lua_pushvalue(L, 2), lua_next(L, 1)) {
jbe@402	230 luaL_argcheck(L, lua_isstring(L, -2), 1, "key in table is not a string");
jbe@402	231 luaL_argcheck(L, lua_isstring(L, -1), 1, "value in table is not a string");
jbe@402	232 value = lua_tolstring(L, -1, &value_len);
jbe@40	233 lua_replace(L, 3);
jbe@402	234 lua_pop(L, 1);
jbe@40	235 lua_replace(L, 2);
jbe@402	236 if (need_seperator) luaL_addchar(&buf, ' ');
jbe@40	237 // NOTE: numbers will be converted to strings automatically here,
jbe@40	238 // but perhaps this will change in future versions of lua
jbe@40	239 lua_pushvalue(L, 2);
jbe@402	240 luaL_addvalue(&buf);
jbe@402	241 luaL_addchar(&buf, '=');
jbe@402	242 luaL_addchar(&buf, '\'');
jbe@402	243 do {
jbe@402	244 char c;
jbe@402	245 c = value[value_pos++];
jbe@402	246 if (c == '\'') luaL_addchar(&buf, '\\');
jbe@402	247 luaL_addchar(&buf, c);
jbe@402	248 } while (value_pos < value_len);
jbe@402	249 luaL_addchar(&buf, '\'');
jbe@402	250 need_seperator = 1;
jbe/bsw@0	251 }
jbe@402	252 luaL_pushresult(&buf);
jbe/bsw@0	253 }
jbe@402	254 // ensure that string is on stack position 1 which is the top of stack:
jbe@402	255 lua_replace(L, 1);
jbe/bsw@0	256 }
jbe@402	257 // use conninfo string on stack position 1:
jbe@402	258 conninfo = lua_tostring(L, 1);
jbe@406	259 // create userdata on stack position 2:
jbe@406	260 lua_settop(L, 1);
jbe@406	261 conn = lua_newuserdata(L, sizeof(*conn)); // 2
jbe@23	262 // call PQconnectdb function of libpq:
jbe@406	263 conn->pgconn = PQconnectdb(conninfo);
jbe@406	264 // try emergency garbage collection on first failure:
jbe@406	265 if (!conn->pgconn) {
jbe@406	266 lua_gc(L, LUA_GCCOLLECT, 0);
jbe@406	267 conn->pgconn = PQconnectdb(conninfo);
jbe@407	268 // throw error in case of (unexpected) error of PQconnectdb call:
jbe@407	269 if (!conn->pgconn) return luaL_error(L,
jbe@407	270 "Error in libpq while creating 'PGconn' structure."
jbe@407	271 );
jbe/bsw@0	272 }
jbe@406	273 // set metatable for userdata (ensure PQfinish on unexpected error below):
jbe@406	274 luaL_setmetatable(L, MONDELEFANT_CONN_MT_REGKEY);
jbe@406	275 // check result of PQconnectdb call:
jbe@406	276 if (PQstatus(conn->pgconn) != CONNECTION_OK) {
jbe@406	277 lua_pushnil(L); // 3
jbe@406	278 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 4
jbe@406	279 lua_newtable(L); // 5
jbe@406	280 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe/bsw@0	281 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@406	282 lua_setfield(L, 5, "code");
jbe@406	283 lua_pushvalue(L, 4);
jbe@406	284 lua_setfield(L, 5, "message");
jbe@406	285 // manual PQfinish (do not wait until garbage collection):
jbe@406	286 PQfinish(conn->pgconn);
jbe@406	287 conn->pgconn = NULL;
jbe/bsw@0	288 return 3;
jbe/bsw@0	289 }
jbe@23	290 // set 'server_encoding' in C-struct of userdata:
jbe/bsw@0	291 {
jbe/bsw@0	292 const char *charset;
jbe@406	293 charset = PQparameterStatus(conn->pgconn, "server_encoding");
jbe/bsw@0	294 if (charset && !strcmp(charset, "UTF8")) {
jbe/bsw@0	295 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_UTF8;
jbe/bsw@0	296 } else {
jbe/bsw@0	297 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_ASCII;
jbe/bsw@0	298 }
jbe/bsw@0	299 }
jbe@396	300 // create and associate userdata table:
jbe@396	301 lua_newtable(L);
jbe@406	302 lua_setuservalue(L, 2);
jbe@396	303 // store key "fd" with file descriptor of connection:
jbe@406	304 lua_pushinteger(L, PQsocket(conn->pgconn));
jbe@406	305 lua_setfield(L, 2, "fd");
jbe@23	306 // store key "engine" with value "postgresql" as connection specific data:
jbe/bsw@0	307 lua_pushliteral(L, "postgresql");
jbe@406	308 lua_setfield(L, 2, "engine");
jbe@23	309 // return userdata:
jbe/bsw@0	310 return 1;
jbe/bsw@0	311 }
jbe/bsw@0	312
jbe@23	313 // returns pointer to libpq handle 'pgconn' of userdata at given index
jbe@23	314 // (or throws error, if database connection has been closed):
jbe/bsw@0	315 static mondelefant_conn_t mondelefant_get_conn(lua_State L, int index) {
jbe/bsw@0	316 mondelefant_conn_t *conn;
jbe/bsw@0	317 conn = luaL_checkudata(L, index, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0	318 if (!conn->pgconn) {
jbe/bsw@0	319 luaL_error(L, "PostgreSQL connection has been closed.");
jbe/bsw@0	320 return NULL;
jbe/bsw@0	321 }
jbe/bsw@0	322 return conn;
jbe/bsw@0	323 }
jbe/bsw@0	324
jbe@23	325 // meta-method "__index" of database handles (userdata):
jbe/bsw@0	326 static int mondelefant_conn_index(lua_State *L) {
jbe@23	327 // try table for connection specific data:
jbe/bsw@0	328 lua_settop(L, 2);
jbe@396	329 lua_getuservalue(L, 1); // 3
jbe/bsw@0	330 lua_pushvalue(L, 2); // 4
jbe/bsw@0	331 lua_gettable(L, 3); // 4
jbe/bsw@0	332 if (!lua_isnil(L, 4)) return 1;
jbe@23	333 // try to use prototype stored in connection specific data:
jbe/bsw@0	334 lua_settop(L, 3);
jbe/bsw@0	335 lua_getfield(L, 3, "prototype"); // 4
jbe/bsw@0	336 if (lua_toboolean(L, 4)) {
jbe/bsw@0	337 lua_pushvalue(L, 2); // 5
jbe/bsw@0	338 lua_gettable(L, 4); // 5
jbe/bsw@0	339 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0	340 }
jbe@23	341 // try to use "postgresql_connection_prototype" of library:
jbe/bsw@0	342 lua_settop(L, 2);
jbe/bsw@0	343 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY); // 3
jbe/bsw@0	344 lua_getfield(L, 3, "postgresql_connection_prototype"); // 4
jbe/bsw@0	345 if (lua_toboolean(L, 4)) {
jbe/bsw@0	346 lua_pushvalue(L, 2); // 5
jbe/bsw@0	347 lua_gettable(L, 4); // 5
jbe/bsw@0	348 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0	349 }
jbe@23	350 // try to use "connection_prototype" of library:
jbe/bsw@0	351 lua_settop(L, 3);
jbe/bsw@0	352 lua_getfield(L, 3, "connection_prototype"); // 4
jbe/bsw@0	353 if (lua_toboolean(L, 4)) {
jbe/bsw@0	354 lua_pushvalue(L, 2); // 5
jbe/bsw@0	355 lua_gettable(L, 4); // 5
jbe/bsw@0	356 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0	357 }
jbe@23	358 // give up and return nothing:
jbe/bsw@0	359 return 0;
jbe/bsw@0	360 }
jbe/bsw@0	361
jbe@23	362 // meta-method "__newindex" of database handles (userdata):
jbe/bsw@0	363 static int mondelefant_conn_newindex(lua_State *L) {
jbe@23	364 // store key-value pair in table for connection specific data:
jbe/bsw@0	365 lua_settop(L, 3);
jbe@396	366 lua_getuservalue(L, 1); // 4
jbe/bsw@0	367 lua_pushvalue(L, 2);
jbe/bsw@0	368 lua_pushvalue(L, 3);
jbe/bsw@0	369 lua_settable(L, 4);
jbe@23	370 // return nothing:
jbe/bsw@0	371 return 0;
jbe/bsw@0	372 }
jbe/bsw@0	373
jbe@23	374 // meta-method "__gc" of database handles:
jbe/bsw@0	375 static int mondelefant_conn_free(lua_State *L) {
jbe/bsw@0	376 mondelefant_conn_t *conn;
jbe/bsw@0	377 conn = luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@410	378 if (conn->todo_PQfreemem) {
jbe@410	379 PQfreemem(conn->todo_PQfreemem);
jbe@410	380 conn->todo_PQfreemem = NULL;
jbe@410	381 }
jbe@410	382 if (conn->todo_PQclear) {
jbe@410	383 PQclear(conn->todo_PQclear);
jbe@410	384 conn->todo_PQclear = NULL;
jbe@410	385 }
jbe@410	386 if (conn->pgconn) {
jbe@410	387 PQfinish(conn->pgconn);
jbe@410	388 conn->pgconn = NULL;
jbe@410	389 }
jbe/bsw@0	390 return 0;
jbe/bsw@0	391 }
jbe/bsw@0	392
jbe@23	393 // method "close" of database handles:
jbe/bsw@0	394 static int mondelefant_conn_close(lua_State *L) {
jbe/bsw@0	395 mondelefant_conn_t *conn;
jbe/bsw@0	396 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0	397 PQfinish(conn->pgconn);
jbe/bsw@0	398 conn->pgconn = NULL;
jbe@397	399 lua_pushnil(L);
jbe@396	400 lua_setfield(L, 1, "fd"); // set "fd" attribute to nil
jbe/bsw@0	401 return 0;
jbe/bsw@0	402 }
jbe/bsw@0	403
jbe@23	404 // method "is_okay" of database handles:
jbe/bsw@0	405 static int mondelefant_conn_is_ok(lua_State *L) {
jbe/bsw@0	406 mondelefant_conn_t *conn;
jbe/bsw@0	407 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0	408 lua_pushboolean(L, PQstatus(conn->pgconn) == CONNECTION_OK);
jbe/bsw@0	409 return 1;
jbe/bsw@0	410 }
jbe/bsw@0	411
jbe@23	412 // method "get_transaction_status" of database handles:
jbe/bsw@0	413 static int mondelefant_conn_get_transaction_status(lua_State *L) {
jbe/bsw@0	414 mondelefant_conn_t *conn;
jbe/bsw@0	415 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0	416 switch (PQtransactionStatus(conn->pgconn)) {
jbe/bsw@0	417 case PQTRANS_IDLE:
jbe/bsw@0	418 lua_pushliteral(L, "idle");
jbe/bsw@0	419 break;
jbe/bsw@0	420 case PQTRANS_ACTIVE:
jbe/bsw@0	421 lua_pushliteral(L, "active");
jbe/bsw@0	422 break;
jbe/bsw@0	423 case PQTRANS_INTRANS:
jbe/bsw@0	424 lua_pushliteral(L, "intrans");
jbe/bsw@0	425 break;
jbe/bsw@0	426 case PQTRANS_INERROR:
jbe/bsw@0	427 lua_pushliteral(L, "inerror");
jbe/bsw@0	428 break;
jbe/bsw@0	429 default:
jbe/bsw@0	430 lua_pushliteral(L, "unknown");
jbe/bsw@0	431 }
jbe/bsw@0	432 return 1;
jbe/bsw@0	433 }
jbe/bsw@0	434
jbe@397	435 // method "try_wait" of database handles:
jbe@397	436 static int mondelefant_conn_try_wait(lua_State *L) {
jbe@393	437 mondelefant_conn_t *conn;
jbe@393	438 int infinite, nonblock = 0;
jbe@393	439 struct timespec wakeup;
jbe@393	440 int fd;
jbe@393	441 fd_set fds;
jbe@393	442 conn = mondelefant_get_conn(L, 1);
jbe@393	443 infinite = lua_isnoneornil(L, 2);
jbe@393	444 if (!infinite) {
jbe@393	445 lua_Number n;
jbe@393	446 int isnum;
jbe@393	447 n = lua_tonumberx(L, 2, &isnum);
jbe@393	448 if (isnum && n>0 && n<=86400*366) {
jbe@393	449 if (clock_gettime(CLOCK_MONOTONIC, &wakeup)) {
jbe@393	450 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393	451 }
jbe@393	452 wakeup.tv_sec += n;
jbe@393	453 wakeup.tv_nsec += 1000000000 * (n - (time_t)n);
jbe@393	454 if (wakeup.tv_nsec >= 1000000000) {
jbe@393	455 wakeup.tv_sec += 1;
jbe@393	456 wakeup.tv_nsec -= 1000000000;
jbe@393	457 }
jbe@393	458 } else if (isnum && n==0) {
jbe@393	459 nonblock = 1;
jbe@393	460 } else {
jbe@393	461 luaL_argcheck(L, 0, 2, "not a valid timeout");
jbe@393	462 }
jbe@393	463 }
jbe@397	464 lua_settop(L, 1);
jbe@393	465 if (!nonblock) {
jbe@393	466 fd = PQsocket(conn->pgconn);
jbe@393	467 FD_ZERO(&fds);
jbe@393	468 FD_SET(fd, &fds);
jbe@393	469 }
jbe@393	470 while (true) {
jbe@393	471 {
jbe@393	472 PGnotify *notify;
jbe@393	473 if (!PQconsumeInput(conn->pgconn)) {
jbe@397	474 lua_newtable(L); // 2
jbe@406	475 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe@397	476 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@397	477 lua_setfield(L, 2, "code");
jbe@397	478 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 3
jbe@397	479 lua_setfield(L, 2, "message");
jbe@397	480 return 1;
jbe@393	481 }
jbe@412	482 // avoid cumulating memory leaks in case of previous out-of-memory errors:
jbe@412	483 if (conn->todo_PQfreemem) {
jbe@412	484 PQfreemem(conn->todo_PQfreemem);
jbe@412	485 conn->todo_PQfreemem = NULL;
jbe@412	486 }
jbe@393	487 notify = PQnotifies(conn->pgconn);
jbe@393	488 if (notify) {
jbe@412	489 // ensure call of PQfreemem in case of out-of-memory errors:
jbe@412	490 conn->todo_PQfreemem = notify;
jbe@412	491 // do Lua operations:
jbe@397	492 lua_pushnil(L);
jbe@393	493 lua_pushstring(L, notify->relname);
jbe@393	494 lua_pushstring(L, notify->extra);
jbe@393	495 lua_pushinteger(L, notify->be_pid);
jbe@412	496 // free memory allocated by PQnotifies:
jbe@393	497 PQfreemem(notify);
jbe@412	498 // avoid double call of PQfreemem later:
jbe@412	499 conn->todo_PQfreemem = NULL;
jbe@397	500 return 4;
jbe@393	501 }
jbe@393	502 }
jbe@393	503 if (infinite) {
jbe@393	504 select(fd+1, &fds, NULL, NULL, NULL);
jbe@393	505 } else if (nonblock) {
jbe@393	506 break;
jbe@393	507 } else {
jbe@393	508 struct timespec tp;
jbe@393	509 struct timeval timeout = { 0, };
jbe@393	510 if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
jbe@393	511 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393	512 }
jbe@393	513 tp.tv_sec = wakeup.tv_sec - tp.tv_sec;
jbe@393	514 tp.tv_nsec = wakeup.tv_nsec - tp.tv_nsec;
jbe@393	515 if (tp.tv_nsec < 0) {
jbe@393	516 tp.tv_sec -= 1;
jbe@393	517 tp.tv_nsec += 1000000000;
jbe@393	518 }
jbe@393	519 timeout.tv_sec = tp.tv_sec;
jbe@393	520 timeout.tv_usec = (tp.tv_nsec + 500) / 1000;
jbe@393	521 if (
jbe@393	522 timeout.tv_sec < 0 \|\|
jbe@393	523 (timeout.tv_sec == 0 && timeout.tv_usec == 0)
jbe@393	524 ) break;
jbe@393	525 select(fd+1, &fds, NULL, NULL, &timeout);
jbe@393	526 }
jbe@393	527 }
jbe@397	528 lua_pushnil(L);
jbe@397	529 lua_pushnil(L);
jbe@393	530 return 2;
jbe@393	531 }
jbe@393	532
jbe@23	533 // method "create_list" of database handles:
jbe/bsw@0	534 static int mondelefant_conn_create_list(lua_State *L) {
jbe@23	535 // ensure that first argument is a database connection:
jbe/bsw@0	536 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23	537 // if no second argument is given, use an empty table:
jbe@397	538 if (lua_isnoneornil(L, 2)) {
jbe@397	539 lua_settop(L, 1);
jbe@397	540 lua_newtable(L); // 2
jbe@397	541 } else {
jbe@397	542 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397	543 lua_settop(L, 2);
jbe/bsw@0	544 }
jbe@23	545 // set meta-table for database result lists/objects:
jbe@406	546 luaL_setmetatable(L, MONDELEFANT_RESULT_MT_REGKEY);
jbe@23	547 // set "_connection" attribute to self:
jbe/bsw@0	548 lua_pushvalue(L, 1); // 3
jbe/bsw@0	549 lua_setfield(L, 2, "_connection");
jbe@23	550 // set "_type" attribute to string "list":
jbe/bsw@0	551 lua_pushliteral(L, "list"); // 3
jbe/bsw@0	552 lua_setfield(L, 2, "_type");
jbe@23	553 // return created database result list:
jbe/bsw@0	554 return 1;
jbe/bsw@0	555 }
jbe/bsw@0	556
jbe@23	557 // method "create_object" of database handles:
jbe/bsw@0	558 static int mondelefant_conn_create_object(lua_State *L) {
jbe@23	559 // ensure that first argument is a database connection:
jbe/bsw@0	560 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23	561 // if no second argument is given, use an empty table:
jbe@397	562 if (lua_isnoneornil(L, 2)) {
jbe@397	563 lua_settop(L, 1);
jbe@397	564 lua_newtable(L); // 2
jbe@397	565 } else {
jbe@397	566 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397	567 lua_settop(L, 2);
jbe/bsw@0	568 }
jbe@397	569 // set meta-table for database result lists/objects:
jbe@406	570 luaL_setmetatable(L, MONDELEFANT_RESULT_MT_REGKEY);
jbe@23	571 // set "_connection" attribute to self:
jbe/bsw@0	572 lua_pushvalue(L, 1); // 3
jbe/bsw@0	573 lua_setfield(L, 2, "_connection");
jbe@23	574 // set "_type" attribute to string "object":
jbe/bsw@0	575 lua_pushliteral(L, "object"); // 3
jbe/bsw@0	576 lua_setfield(L, 2, "_type"); // "object" or "list"
jbe@23	577 // create empty tables for "_data", "_dirty" and "_ref" attributes:
jbe/bsw@0	578 lua_newtable(L); // 3
jbe/bsw@0	579 lua_setfield(L, 2, "_data");
jbe/bsw@0	580 lua_newtable(L); // 3
jbe/bsw@0	581 lua_setfield(L, 2, "_dirty");
jbe/bsw@0	582 lua_newtable(L); // 3
jbe/bsw@0	583 lua_setfield(L, 2, "_ref"); // nil=no info, false=nil, else table
jbe@417	584 // create column proxy (field "_col" in result object):
jbe@416	585 lua_newtable(L); // 3
jbe@416	586 luaL_setmetatable(L, MONDELEFANT_COLUMNS_MT_REGKEY);
jbe@416	587 lua_pushvalue(L, 2); // 4
jbe@416	588 lua_rawsetp(L, 3, MONDELEFANT_COLUMNS_RESULT_LUKEY);
jbe@417	589 lua_setfield(L, 2, "_col");
jbe@416	590 // return created database result object (from stack position 2):
jbe/bsw@0	591 return 1;
jbe/bsw@0	592 }
jbe/bsw@0	593
jbe@23	594 // method "quote_string" of database handles:
jbe/bsw@0	595 static int mondelefant_conn_quote_string(lua_State *L) {
jbe/bsw@0	596 mondelefant_conn_t *conn;
jbe/bsw@0	597 const char *input;
jbe/bsw@0	598 size_t input_len;
jbe@407	599 luaL_Buffer buf;
jbe/bsw@0	600 char *output;
jbe/bsw@0	601 size_t output_len;
jbe@407	602 // get database connection object:
jbe/bsw@0	603 conn = mondelefant_get_conn(L, 1);
jbe@23	604 // get second argument, which must be a string:
jbe/bsw@0	605 input = luaL_checklstring(L, 2, &input_len);
jbe@23	606 // throw error, if string is too long:
jbe/bsw@0	607 if (input_len > (SIZE_MAX / sizeof(char) - 3) / 2) {
jbe/bsw@0	608 return luaL_error(L, "String to be escaped is too long.");
jbe/bsw@0	609 }
jbe@23	610 // allocate memory for quoted string:
jbe@407	611 output = luaL_buffinitsize(L, &buf, (2 * input_len + 3) * sizeof(char));
jbe@23	612 // do escaping by calling PQescapeStringConn and enclosing result with
jbe@23	613 // single quotes:
jbe/bsw@0	614 output[0] = '\'';
jbe/bsw@0	615 output_len = PQescapeStringConn(
jbe/bsw@0	616 conn->pgconn, output + 1, input, input_len, NULL
jbe/bsw@0	617 );
jbe/bsw@0	618 output[output_len + 1] = '\'';
jbe/bsw@0	619 output[output_len + 2] = 0;
jbe@23	620 // create Lua string:
jbe@407	621 luaL_addsize(&buf, output_len + 2);
jbe@23	622 // return Lua string:
jbe/bsw@0	623 return 1;
jbe/bsw@0	624 }
jbe/bsw@0	625
jbe@23	626 // method "quote_binary" of database handles:
jbe/bsw@0	627 static int mondelefant_conn_quote_binary(lua_State *L) {
jbe/bsw@0	628 mondelefant_conn_t *conn;
jbe/bsw@0	629 const char *input;
jbe/bsw@0	630 size_t input_len;
jbe/bsw@0	631 char *output;
jbe/bsw@0	632 size_t output_len;
jbe/bsw@0	633 luaL_Buffer buf;
jbe@407	634 // get database connection object:
jbe/bsw@0	635 conn = mondelefant_get_conn(L, 1);
jbe@23	636 // get second argument, which must be a string:
jbe/bsw@0	637 input = luaL_checklstring(L, 2, &input_len);
jbe@408	638 // avoid cumulating memory leaks in case of previous out-of-memory errors:
jbe@410	639 if (conn->todo_PQfreemem) {
jbe@410	640 PQfreemem(conn->todo_PQfreemem);
jbe@410	641 conn->todo_PQfreemem = NULL;
jbe@410	642 }
jbe@23	643 // call PQescapeByteaConn, which allocates memory itself:
jbe/bsw@0	644 output = (char *)PQescapeByteaConn(
jbe/bsw@0	645 conn->pgconn, (const unsigned char *)input, input_len, &output_len
jbe/bsw@0	646 );
jbe/bsw@0	647 if (!output) {
jbe@408	648 lua_gc(L, LUA_GCCOLLECT, 0);
jbe@408	649 output = (char *)PQescapeByteaConn(
jbe@408	650 conn->pgconn, (const unsigned char *)input, input_len, &output_len
jbe@408	651 );
jbe@408	652 if (!output) {
jbe@408	653 return luaL_error(L, "Could not allocate memory for binary quoting.");
jbe@408	654 }
jbe/bsw@0	655 }
jbe@412	656 // ensure call of PQfreemem in case of out-of-memory errors:
jbe@408	657 conn->todo_PQfreemem = output;
jbe@23	658 // create Lua string enclosed by single quotes:
jbe/bsw@0	659 luaL_buffinit(L, &buf);
jbe/bsw@0	660 luaL_addchar(&buf, '\'');
jbe/bsw@0	661 luaL_addlstring(&buf, output, output_len - 1);
jbe/bsw@0	662 luaL_addchar(&buf, '\'');
jbe/bsw@0	663 luaL_pushresult(&buf);
jbe@23	664 // free memory allocated by PQescapeByteaConn:
jbe/bsw@0	665 PQfreemem(output);
jbe@408	666 // avoid double call of PQfreemem later:
jbe@408	667 conn->todo_PQfreemem = NULL;
jbe@23	668 // return Lua string:
jbe/bsw@0	669 return 1;
jbe/bsw@0	670 }
jbe/bsw@0	671
jbe@23	672 // method "assemble_command" of database handles:
jbe/bsw@0	673 static int mondelefant_conn_assemble_command(lua_State *L) {
jbe/bsw@0	674 mondelefant_conn_t *conn;
jbe/bsw@0	675 int paramidx = 2;
jbe/bsw@0	676 const char *template;
jbe/bsw@0	677 size_t template_pos = 0;
jbe/bsw@0	678 luaL_Buffer buf;
jbe@407	679 // get database connection object:
jbe/bsw@0	680 conn = mondelefant_get_conn(L, 1);
jbe@23	681 // if second argument is a string, return this string:
jbe@397	682 if (lua_type(L, 2) == LUA_TSTRING) {
jbe@397	683 lua_settop(L, 2);
jbe/bsw@0	684 return 1;
jbe/bsw@0	685 }
jbe@23	686 // if second argument has __tostring meta-method,
jbe@23	687 // then use this method and return its result:
jbe/bsw@0	688 if (luaL_callmeta(L, 2, "__tostring")) return 1;
jbe@23	689 // otherwise, require that second argument is a table:
jbe/bsw@0	690 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397	691 // set stack top:
jbe@397	692 lua_settop(L, 2);
jbe@23	693 // get first element of table, which must be a string:
jbe/bsw@0	694 lua_rawgeti(L, 2, 1); // 3
jbe/bsw@0	695 luaL_argcheck(L,
jbe/bsw@0	696 lua_isstring(L, 3),
jbe/bsw@0	697 2,
jbe/bsw@0	698 "First entry of SQL command structure is not a string."
jbe/bsw@0	699 );
jbe/bsw@0	700 template = lua_tostring(L, 3);
jbe@23	701 // get value of "input_converter" attribute of database connection:
jbe/bsw@0	702 lua_pushliteral(L, "input_converter"); // 4
jbe/bsw@0	703 lua_gettable(L, 1); // input_converter at stack position 4
jbe@23	704 // reserve space on Lua stack:
jbe/bsw@0	705 lua_pushnil(L); // free space at stack position 5
jbe/bsw@0	706 lua_pushnil(L); // free space at stack position 6
jbe@23	707 // initialize Lua buffer for result string:
jbe/bsw@0	708 luaL_buffinit(L, &buf);
jbe@23	709 // fill buffer in loop:
jbe/bsw@0	710 while (1) {
jbe@23	711 // variable declaration:
jbe/bsw@0	712 char c;
jbe@23	713 // get next character:
jbe/bsw@0	714 c = template[template_pos++];
jbe@23	715 // break, when character is NULL byte:
jbe/bsw@0	716 if (!c) break;
jbe@23	717 // question-mark and dollar-sign are special characters:
jbe@23	718 if (c == '?' \|\| c == '$') { // special character found
jbe@23	719 // check, if same character follows:
jbe@23	720 if (template[template_pos] == c) { // special character is escaped
jbe@23	721 // consume two characters of input and add one character to buffer:
jbe/bsw@0	722 template_pos++;
jbe/bsw@0	723 luaL_addchar(&buf, c);
jbe@23	724 } else { // special character is not escaped
jbe/bsw@0	725 luaL_Buffer keybuf;
jbe/bsw@0	726 int subcmd;
jbe@23	727 // set 'subcmd' = true, if special character was a dollar-sign,
jbe@23	728 // set 'subcmd' = false, if special character was a question-mark:
jbe/bsw@0	729 subcmd = (c == '$');
jbe@23	730 // read any number of alpha numeric chars or underscores
jbe@23	731 // and store them on Lua stack:
jbe/bsw@0	732 luaL_buffinit(L, &keybuf);
jbe/bsw@0	733 while (1) {
jbe/bsw@0	734 c = template[template_pos];
jbe/bsw@0	735 if (
jbe/bsw@0	736 (c < 'A' \|\| c > 'Z') &&
jbe/bsw@0	737 (c < 'a' \|\| c > 'z') &&
jbe/bsw@0	738 (c < '0' \|\| c > '9') &&
jbe/bsw@0	739 (c != '_')
jbe/bsw@0	740 ) break;
jbe/bsw@0	741 luaL_addchar(&keybuf, c);
jbe/bsw@0	742 template_pos++;
jbe/bsw@0	743 }
jbe/bsw@0	744 luaL_pushresult(&keybuf);
jbe@23	745 // check, if any characters matched:
jbe@64	746 if (lua_rawlen(L, -1)) {
jbe@23	747 // if any alpha numeric chars or underscores were found,
jbe@23	748 // push them on stack as a Lua string and use them to lookup
jbe@23	749 // value from second argument:
jbe/bsw@0	750 lua_pushvalue(L, -1); // save key on stack
jbe@23	751 lua_gettable(L, 2); // fetch value (raw-value)
jbe/bsw@0	752 } else {
jbe@23	753 // otherwise push nil and use numeric lookup based on 'paramidx':
jbe/bsw@0	754 lua_pop(L, 1);
jbe/bsw@0	755 lua_pushnil(L); // put nil on key position
jbe@23	756 lua_rawgeti(L, 2, paramidx++); // fetch value (raw-value)
jbe/bsw@0	757 }
jbe@23	758 // Lua stack contains: ..., <buffer>, key, raw-value
jbe@23	759 // branch according to type of special character ("?" or "$"):
jbe@23	760 if (subcmd) { // dollar-sign
jbe/bsw@0	761 size_t i;
jbe/bsw@0	762 size_t count;
jbe@23	763 // store fetched value (which is supposed to be sub-structure)
jbe@23	764 // on Lua stack position 5 and drop key:
jbe@23	765 lua_replace(L, 5);
jbe@23	766 lua_pop(L, 1);
jbe@23	767 // Lua stack contains: ..., <buffer>
jbe@23	768 // check, if fetched value is really a sub-structure:
jbe/bsw@0	769 luaL_argcheck(L,
jbe/bsw@0	770 !lua_isnil(L, 5),
jbe/bsw@0	771 2,
jbe/bsw@0	772 "SQL sub-structure not found."
jbe/bsw@0	773 );
jbe/bsw@0	774 luaL_argcheck(L,
jbe/bsw@0	775 lua_type(L, 5) == LUA_TTABLE,
jbe/bsw@0	776 2,
jbe/bsw@0	777 "SQL sub-structure must be a table."
jbe/bsw@0	778 );
jbe@23	779 // Lua stack contains: ..., <buffer>
jbe@23	780 // get value of "sep" attribute of sub-structure,
jbe@23	781 // and place it on Lua stack position 6:
jbe/bsw@0	782 lua_getfield(L, 5, "sep");
jbe@23	783 lua_replace(L, 6);
jbe@23	784 // if seperator is nil, then use ", " as default,
jbe@23	785 // if seperator is neither nil nor a string, then throw error:
jbe/bsw@0	786 if (lua_isnil(L, 6)) {
jbe/bsw@0	787 lua_pushstring(L, ", ");
jbe/bsw@0	788 lua_replace(L, 6);
jbe/bsw@0	789 } else {
jbe/bsw@0	790 luaL_argcheck(L,
jbe/bsw@0	791 lua_isstring(L, 6),
jbe/bsw@0	792 2,
jbe/bsw@0	793 "Seperator of SQL sub-structure has to be a string."
jbe/bsw@0	794 );
jbe/bsw@0	795 }
jbe@23	796 // iterate over items of sub-structure:
jbe@64	797 count = lua_rawlen(L, 5);
jbe/bsw@0	798 for (i = 0; i < count; i++) {
jbe@23	799 // add seperator, unless this is the first run:
jbe/bsw@0	800 if (i) {
jbe/bsw@0	801 lua_pushvalue(L, 6);
jbe/bsw@0	802 luaL_addvalue(&buf);
jbe/bsw@0	803 }
jbe@23	804 // recursivly apply assemble function and add results to buffer:
jbe/bsw@0	805 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0	806 lua_pushvalue(L, 1);
jbe/bsw@0	807 lua_rawgeti(L, 5, i+1);
jbe/bsw@0	808 lua_call(L, 2, 1);
jbe/bsw@0	809 luaL_addvalue(&buf);
jbe/bsw@0	810 }
jbe@23	811 } else { // question-mark
jbe/bsw@0	812 if (lua_toboolean(L, 4)) {
jbe@23	813 // call input_converter with connection handle, raw-value and
jbe@23	814 // an info-table which contains a "field_name" entry with the
jbe@23	815 // used key:
jbe/bsw@0	816 lua_pushvalue(L, 4);
jbe/bsw@0	817 lua_pushvalue(L, 1);
jbe/bsw@0	818 lua_pushvalue(L, -3);
jbe/bsw@0	819 lua_newtable(L);
jbe/bsw@0	820 lua_pushvalue(L, -6);
jbe/bsw@0	821 lua_setfield(L, -2, "field_name");
jbe/bsw@0	822 lua_call(L, 3, 1);
jbe@23	823 // Lua stack contains: ..., <buffer>, key, raw-value, final-value
jbe@23	824 // remove key and raw-value:
jbe/bsw@0	825 lua_remove(L, -2);
jbe/bsw@0	826 lua_remove(L, -2);
jbe@23	827 // Lua stack contains: ..., <buffer>, final-value
jbe@23	828 // throw error, if final-value is not a string:
jbe/bsw@0	829 if (!lua_isstring(L, -1)) {
jbe/bsw@0	830 return luaL_error(L, "input_converter returned non-string.");
jbe/bsw@0	831 }
jbe/bsw@0	832 } else {
jbe@23	833 // remove key from stack:
jbe/bsw@0	834 lua_remove(L, -2);
jbe@23	835 // Lua stack contains: ..., <buffer>, raw-value
jbe@23	836 // branch according to type of value:
jbe@408	837 // NOTE: Lua automatically converts numbers to strings
jbe@23	838 if (lua_isnil(L, -1)) { // value is nil
jbe@23	839 // push string "NULL" to stack:
jbe/bsw@0	840 lua_pushliteral(L, "NULL");
jbe@23	841 } else if (lua_type(L, -1) == LUA_TBOOLEAN) { // value is boolean
jbe@23	842 // push strings "TRUE" or "FALSE" to stack:
jbe/bsw@0	843 lua_pushstring(L, lua_toboolean(L, -1) ? "TRUE" : "FALSE");
jbe@23	844 } else if (lua_isstring(L, -1)) { // value is string or number
jbe@408	845 // push output of "quote_string" method of database connection
jbe@408	846 // to stack:
jbe/bsw@0	847 lua_tostring(L, -1);
jbe/bsw@0	848 lua_pushcfunction(L, mondelefant_conn_quote_string);
jbe/bsw@0	849 lua_pushvalue(L, 1);
jbe/bsw@0	850 lua_pushvalue(L, -3);
jbe/bsw@0	851 lua_call(L, 2, 1);
jbe@23	852 } else { // value is of other type
jbe@23	853 // throw error:
jbe/bsw@0	854 return luaL_error(L,
jbe/bsw@0	855 "Unable to convert SQL value due to unknown type "
jbe/bsw@0	856 "or missing input_converter."
jbe/bsw@0	857 );
jbe/bsw@0	858 }
jbe@23	859 // Lua stack contains: ..., <buffer>, raw-value, final-value
jbe@23	860 // remove raw-value:
jbe/bsw@0	861 lua_remove(L, -2);
jbe@23	862 // Lua stack contains: ..., <buffer>, final-value
jbe/bsw@0	863 }
jbe@23	864 // append final-value to buffer:
jbe/bsw@0	865 luaL_addvalue(&buf);
jbe/bsw@0	866 }
jbe/bsw@0	867 }
jbe@23	868 } else { // character is not special
jbe@23	869 // just copy character:
jbe/bsw@0	870 luaL_addchar(&buf, c);
jbe/bsw@0	871 }
jbe/bsw@0	872 }
jbe@23	873 // return string in buffer:
jbe/bsw@0	874 luaL_pushresult(&buf);
jbe/bsw@0	875 return 1;
jbe/bsw@0	876 }
jbe/bsw@0	877
jbe@23	878 // max number of SQL statements executed by one "query" method call:
jbe/bsw@0	879 #define MONDELEFANT_MAX_COMMAND_COUNT 64
jbe@23	880 // max number of columns in a database result:
jbe/bsw@0	881 #define MONDELEFANT_MAX_COLUMN_COUNT 1024
jbe@23	882 // enum values for 'modes' array in C-function below:
jbe/bsw@0	883 #define MONDELEFANT_QUERY_MODE_LIST 1
jbe/bsw@0	884 #define MONDELEFANT_QUERY_MODE_OBJECT 2
jbe/bsw@0	885 #define MONDELEFANT_QUERY_MODE_OPT_OBJECT 3
jbe/bsw@0	886
jbe@23	887 // method "try_query" of database handles:
jbe/bsw@0	888 static int mondelefant_conn_try_query(lua_State *L) {
jbe/bsw@0	889 mondelefant_conn_t *conn;
jbe/bsw@0	890 int command_count;
jbe/bsw@0	891 int command_idx;
jbe/bsw@0	892 int modes[MONDELEFANT_MAX_COMMAND_COUNT];
jbe/bsw@0	893 luaL_Buffer buf;
jbe/bsw@0	894 int sent_success;
jbe/bsw@0	895 PGresult *res;
jbe/bsw@0	896 int rows, cols, row, col;
jbe@407	897 // get database connection object:
jbe/bsw@0	898 conn = mondelefant_get_conn(L, 1);
jbe@23	899 // calculate number of commands (2 arguments for one command):
jbe/bsw@0	900 command_count = lua_gettop(L) / 2;
jbe@23	901 // push nil on stack, which is needed, if last mode was ommitted:
jbe@23	902 lua_pushnil(L);
jbe@23	903 // throw error, if number of commands is too high:
jbe/bsw@0	904 if (command_count > MONDELEFANT_MAX_COMMAND_COUNT) {
jbe/bsw@0	905 return luaL_error(L, "Exceeded maximum command count in one query.");
jbe/bsw@0	906 }
jbe@23	907 // create SQL string, store query modes and push SQL string on stack:
jbe/bsw@0	908 luaL_buffinit(L, &buf);
jbe/bsw@0	909 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0	910 int mode;
jbe/bsw@0	911 int mode_idx; // stack index of mode string
jbe/bsw@0	912 if (command_idx) luaL_addchar(&buf, ' ');
jbe/bsw@0	913 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0	914 lua_pushvalue(L, 1);
jbe/bsw@0	915 lua_pushvalue(L, 2 + 2 * command_idx);
jbe/bsw@0	916 lua_call(L, 2, 1);
jbe/bsw@0	917 luaL_addvalue(&buf);
jbe/bsw@0	918 luaL_addchar(&buf, ';');
jbe/bsw@0	919 mode_idx = 3 + 2 * command_idx;
jbe/bsw@0	920 if (lua_isnil(L, mode_idx)) {
jbe/bsw@0	921 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0	922 } else {
jbe/bsw@0	923 const char *modestr;
jbe/bsw@0	924 modestr = luaL_checkstring(L, mode_idx);
jbe/bsw@0	925 if (!strcmp(modestr, "list")) {
jbe/bsw@0	926 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0	927 } else if (!strcmp(modestr, "object")) {
jbe/bsw@0	928 mode = MONDELEFANT_QUERY_MODE_OBJECT;
jbe/bsw@0	929 } else if (!strcmp(modestr, "opt_object")) {
jbe/bsw@0	930 mode = MONDELEFANT_QUERY_MODE_OPT_OBJECT;
jbe/bsw@0	931 } else {
jbe@397	932 return luaL_argerror(L, mode_idx, "unknown query mode");
jbe/bsw@0	933 }
jbe/bsw@0	934 }
jbe/bsw@0	935 modes[command_idx] = mode;
jbe/bsw@0	936 }
jbe/bsw@0	937 luaL_pushresult(&buf); // stack position unknown
jbe/bsw@0	938 lua_replace(L, 2); // SQL command string to stack position 2
jbe@23	939 // call sql_tracer, if set:
jbe/bsw@0	940 lua_settop(L, 2);
jbe/bsw@0	941 lua_getfield(L, 1, "sql_tracer"); // tracer at stack position 3
jbe/bsw@0	942 if (lua_toboolean(L, 3)) {
jbe/bsw@0	943 lua_pushvalue(L, 1); // 4
jbe/bsw@0	944 lua_pushvalue(L, 2); // 5
jbe/bsw@0	945 lua_call(L, 2, 1); // trace callback at stack position 3
jbe/bsw@0	946 }
jbe@23	947 // NOTE: If no tracer was found, then nil or false is stored at stack
jbe@23	948 // position 3.
jbe@23	949 // call PQsendQuery function and store result in 'sent_success' variable:
jbe/bsw@0	950 sent_success = PQsendQuery(conn->pgconn, lua_tostring(L, 2));
jbe@23	951 // create preliminary result table:
jbe/bsw@0	952 lua_newtable(L); // results in table at stack position 4
jbe@23	953 // iterate over results using function PQgetResult to fill result table:
jbe/bsw@0	954 for (command_idx = 0; ; command_idx++) {
jbe/bsw@0	955 int mode;
jbe/bsw@0	956 char binary[MONDELEFANT_MAX_COLUMN_COUNT];
jbe/bsw@0	957 ExecStatusType pgstatus;
jbe@23	958 // fetch mode which was given for the command:
jbe/bsw@0	959 mode = modes[command_idx];
jbe@23	960 // if PQsendQuery call was successful, then fetch result data:
jbe/bsw@0	961 if (sent_success) {
jbe@408	962 // avoid cumulating memory leaks in case of previous out-of-memory errors:
jbe@410	963 if (conn->todo_PQclear) {
jbe@410	964 PQclear(conn->todo_PQclear);
jbe@410	965 conn->todo_PQclear = NULL;
jbe@410	966 }
jbe@23	967 // NOTE: PQgetResult called one extra time. Break only, if all
jbe@23	968 // queries have been processed and PQgetResult returned NULL.
jbe/bsw@0	969 res = PQgetResult(conn->pgconn);
jbe/bsw@0	970 if (command_idx >= command_count && !res) break;
jbe/bsw@0	971 if (res) {
jbe/bsw@0	972 pgstatus = PQresultStatus(res);
jbe/bsw@0	973 rows = PQntuples(res);
jbe/bsw@0	974 cols = PQnfields(res);
jbe@412	975 // ensure call of PQclear in case of Lua errors:
jbe@408	976 conn->todo_PQclear = res;
jbe/bsw@0	977 }
jbe/bsw@0	978 }
jbe@23	979 // handle errors:
jbe/bsw@0	980 if (
jbe/bsw@0	981 !sent_success \|\| command_idx >= command_count \|\| !res \|\|
jbe/bsw@0	982 (pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK) \|\|
jbe/bsw@0	983 (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) \|\|
jbe/bsw@0	984 (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST)
jbe/bsw@0	985 ) {
jbe/bsw@0	986 const char *command;
jbe/bsw@0	987 command = lua_tostring(L, 2);
jbe/bsw@0	988 lua_newtable(L); // 5
jbe@406	989 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe/bsw@0	990 lua_pushvalue(L, 1);
jbe/bsw@0	991 lua_setfield(L, 5, "connection");
jbe/bsw@0	992 lua_pushvalue(L, 2);
jbe/bsw@0	993 lua_setfield(L, 5, "sql_command");
jbe@397	994 if (!sent_success) {
jbe@397	995 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe/bsw@0	996 lua_setfield(L, 5, "code");
jbe@397	997 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn));
jbe/bsw@0	998 lua_setfield(L, 5, "message");
jbe/bsw@0	999 } else {
jbe@397	1000 lua_pushinteger(L, command_idx + 1);
jbe@397	1001 lua_setfield(L, 5, "command_number");
jbe@397	1002 if (!res) {
jbe@397	1003 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_LOW);
jbe@397	1004 lua_setfield(L, 5, "code");
jbe@397	1005 lua_pushliteral(L, "Received too few database result sets.");
jbe@397	1006 lua_setfield(L, 5, "message");
jbe@397	1007 } else if (command_idx >= command_count) {
jbe@397	1008 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH);
jbe@397	1009 lua_setfield(L, 5, "code");
jbe@397	1010 lua_pushliteral(L, "Received too many database result sets.");
jbe@397	1011 lua_setfield(L, 5, "message");
jbe@397	1012 } else if (
jbe@397	1013 pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK
jbe@397	1014 ) {
jbe@397	1015 const char *sqlstate;
jbe@397	1016 const char *errmsg;
jbe@397	1017 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SEVERITY));
jbe@397	1018 lua_setfield(L, 5, "pg_severity");
jbe@397	1019 sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
jbe@397	1020 if (sqlstate) {
jbe@397	1021 lua_pushstring(L, sqlstate);
jbe@397	1022 lua_setfield(L, 5, "pg_sqlstate");
jbe@397	1023 lua_pushstring(L, mondelefant_translate_errcode(sqlstate));
jbe@397	1024 lua_setfield(L, 5, "code");
jbe@397	1025 } else {
jbe@397	1026 lua_pushliteral(L, MONDELEFANT_ERRCODE_UNKNOWN);
jbe@397	1027 lua_setfield(L, 5, "code");
jbe@397	1028 }
jbe@397	1029 errmsg = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
jbe@397	1030 if (errmsg) {
jbe@397	1031 mondelefant_push_first_line(L, errmsg);
jbe@397	1032 lua_setfield(L, 5, "message");
jbe@397	1033 lua_pushstring(L, errmsg);
jbe@397	1034 lua_setfield(L, 5, "pg_message_primary");
jbe@397	1035 } else {
jbe@397	1036 lua_pushliteral(L,
jbe@397	1037 "Error while fetching result, but no error message given."
jbe@397	1038 );
jbe@397	1039 lua_setfield(L, 5, "message");
jbe@397	1040 }
jbe@397	1041 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL));
jbe@397	1042 lua_setfield(L, 5, "pg_message_detail");
jbe@397	1043 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_HINT));
jbe@397	1044 lua_setfield(L, 5, "pg_message_hint");
jbe@397	1045 // NOTE: "position" and "pg_internal_position" are recalculated to
jbe@397	1046 // byte offsets, as Lua 5.2 is not Unicode aware.
jbe@397	1047 {
jbe@397	1048 char *tmp;
jbe@397	1049 tmp = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
jbe@397	1050 if (tmp) {
jbe@397	1051 int pos;
jbe@397	1052 pos = atoi(tmp) - 1;
jbe@397	1053 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397	1054 pos = utf8_position_to_byte(command, pos);
jbe@397	1055 }
jbe@397	1056 lua_pushinteger(L, pos + 1);
jbe@397	1057 lua_setfield(L, 5, "position");
jbe@397	1058 }
jbe@397	1059 }
jbe@397	1060 {
jbe@397	1061 const char *internal_query;
jbe@397	1062 internal_query = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
jbe@397	1063 lua_pushstring(L, internal_query);
jbe@397	1064 lua_setfield(L, 5, "pg_internal_query");
jbe@397	1065 char *tmp;
jbe@397	1066 tmp = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
jbe@397	1067 if (tmp) {
jbe@397	1068 int pos;
jbe@397	1069 pos = atoi(tmp) - 1;
jbe@397	1070 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397	1071 pos = utf8_position_to_byte(internal_query, pos);
jbe@397	1072 }
jbe@397	1073 lua_pushinteger(L, pos + 1);
jbe@397	1074 lua_setfield(L, 5, "pg_internal_position");
jbe@397	1075 }
jbe@397	1076 }
jbe@397	1077 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_CONTEXT));
jbe@397	1078 lua_setfield(L, 5, "pg_context");
jbe@397	1079 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FILE));
jbe@397	1080 lua_setfield(L, 5, "pg_source_file");
jbe@397	1081 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_LINE));
jbe@397	1082 lua_setfield(L, 5, "pg_source_line");
jbe@397	1083 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION));
jbe@397	1084 lua_setfield(L, 5, "pg_source_function");
jbe@397	1085 } else if (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) {
jbe@397	1086 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_NO_ROWS);
jbe@397	1087 lua_setfield(L, 5, "code");
jbe@397	1088 lua_pushliteral(L, "Expected one row, but got empty set.");
jbe@397	1089 lua_setfield(L, 5, "message");
jbe@397	1090 } else if (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST) {
jbe@397	1091 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS);
jbe@397	1092 lua_setfield(L, 5, "code");
jbe@397	1093 lua_pushliteral(L, "Got more than one result row.");
jbe@397	1094 lua_setfield(L, 5, "message");
jbe@397	1095 } else {
jbe@397	1096 // should not happen
jbe@397	1097 abort();
jbe@397	1098 }
jbe@397	1099 if (res) {
jbe@397	1100 PQclear(res);
jbe@397	1101 while ((res = PQgetResult(conn->pgconn))) PQclear(res);
jbe@408	1102 // avoid double call of PQclear later:
jbe@408	1103 conn->todo_PQclear = NULL;
jbe@397	1104 }
jbe/bsw@0	1105 }
jbe/bsw@0	1106 if (lua_toboolean(L, 3)) {
jbe/bsw@0	1107 lua_pushvalue(L, 3);
jbe/bsw@0	1108 lua_pushvalue(L, 5);
jbe/bsw@0	1109 lua_call(L, 1, 0);
jbe/bsw@0	1110 }
jbe/bsw@0	1111 return 1;
jbe/bsw@0	1112 }
jbe@23	1113 // call "create_list" or "create_object" method of database handle,
jbe@23	1114 // result will be at stack position 5:
jbe/bsw@0	1115 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0	1116 lua_pushcfunction(L, mondelefant_conn_create_list); // 5
jbe/bsw@0	1117 lua_pushvalue(L, 1); // 6
jbe/bsw@0	1118 lua_call(L, 1, 1); // 5
jbe/bsw@0	1119 } else {
jbe/bsw@0	1120 lua_pushcfunction(L, mondelefant_conn_create_object); // 5
jbe/bsw@0	1121 lua_pushvalue(L, 1); // 6
jbe/bsw@0	1122 lua_call(L, 1, 1); // 5
jbe/bsw@0	1123 }
jbe@23	1124 // set "_column_info":
jbe@23	1125 lua_newtable(L); // 6
jbe/bsw@0	1126 for (col = 0; col < cols; col++) {
jbe/bsw@0	1127 lua_newtable(L); // 7
jbe@380	1128 lua_pushstring(L, PQfname(res, col)); // 8
jbe@380	1129 lua_pushvalue(L, 8); // 9
jbe@380	1130 lua_pushvalue(L, 7); // 10
jbe@380	1131 lua_rawset(L, 6);
jbe/bsw@0	1132 lua_setfield(L, 7, "field_name");
jbe@380	1133 // _column_info entry (for current column) on stack position 7
jbe/bsw@0	1134 {
jbe/bsw@0	1135 Oid tmp;
jbe/bsw@0	1136 tmp = PQftable(res, col);
jbe/bsw@0	1137 if (tmp == InvalidOid) lua_pushnil(L);
jbe/bsw@0	1138 else lua_pushinteger(L, tmp);
jbe/bsw@0	1139 lua_setfield(L, 7, "table_oid");
jbe/bsw@0	1140 }
jbe/bsw@0	1141 {
jbe/bsw@0	1142 int tmp;
jbe/bsw@0	1143 tmp = PQftablecol(res, col);
jbe/bsw@0	1144 if (tmp == 0) lua_pushnil(L);
jbe/bsw@0	1145 else lua_pushinteger(L, tmp);
jbe/bsw@0	1146 lua_setfield(L, 7, "table_column_number");
jbe/bsw@0	1147 }
jbe/bsw@0	1148 {
jbe/bsw@0	1149 Oid tmp;
jbe/bsw@0	1150 tmp = PQftype(res, col);
jbe/bsw@0	1151 binary[col] = (tmp == MONDELEFANT_POSTGRESQL_BINARY_OID);
jbe/bsw@0	1152 lua_pushinteger(L, tmp);
jbe/bsw@0	1153 lua_setfield(L, 7, "type_oid");
jbe/bsw@0	1154 lua_pushstring(L, mondelefant_oid_to_typestr(tmp));
jbe/bsw@0	1155 lua_setfield(L, 7, "type");
jbe/bsw@0	1156 }
jbe/bsw@0	1157 {
jbe/bsw@0	1158 int tmp;
jbe/bsw@0	1159 tmp = PQfmod(res, col);
jbe/bsw@0	1160 if (tmp == -1) lua_pushnil(L);
jbe/bsw@0	1161 else lua_pushinteger(L, tmp);
jbe/bsw@0	1162 lua_setfield(L, 7, "type_modifier");
jbe/bsw@0	1163 }
jbe/bsw@0	1164 lua_rawseti(L, 6, col+1);
jbe/bsw@0	1165 }
jbe@23	1166 lua_setfield(L, 5, "_column_info");
jbe@23	1167 // set "_rows_affected":
jbe/bsw@0	1168 {
jbe/bsw@0	1169 char *tmp;
jbe/bsw@0	1170 tmp = PQcmdTuples(res);
jbe/bsw@0	1171 if (tmp[0]) {
jbe/bsw@0	1172 lua_pushinteger(L, atoi(tmp));
jbe/bsw@0	1173 lua_setfield(L, 5, "_rows_affected");
jbe/bsw@0	1174 }
jbe/bsw@0	1175 }
jbe@23	1176 // set "_oid":
jbe/bsw@0	1177 {
jbe/bsw@0	1178 Oid tmp;
jbe/bsw@0	1179 tmp = PQoidValue(res);
jbe/bsw@0	1180 if (tmp != InvalidOid) {
jbe/bsw@0	1181 lua_pushinteger(L, tmp);
jbe/bsw@0	1182 lua_setfield(L, 5, "_oid");
jbe/bsw@0	1183 }
jbe/bsw@0	1184 }
jbe@23	1185 // copy data as strings or nil, while performing binary unescaping
jbe@23	1186 // automatically:
jbe/bsw@0	1187 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0	1188 for (row = 0; row < rows; row++) {
jbe/bsw@0	1189 lua_pushcfunction(L, mondelefant_conn_create_object); // 6
jbe/bsw@0	1190 lua_pushvalue(L, 1); // 7
jbe/bsw@0	1191 lua_call(L, 1, 1); // 6
jbe/bsw@0	1192 for (col = 0; col < cols; col++) {
jbe/bsw@0	1193 if (PQgetisnull(res, row, col)) {
jbe/bsw@0	1194 lua_pushnil(L);
jbe/bsw@0	1195 } else if (binary[col]) {
jbe/bsw@0	1196 size_t binlen;
jbe/bsw@0	1197 char *binval;
jbe@412	1198 // avoid cumulating memory leaks in case of previous out-of-memory errors:
jbe@412	1199 if (conn->todo_PQfreemem) {
jbe@412	1200 PQfreemem(conn->todo_PQfreemem);
jbe@412	1201 conn->todo_PQfreemem = NULL;
jbe@412	1202 }
jbe@412	1203 // Unescape binary data:
jbe/bsw@0	1204 binval = (char *)PQunescapeBytea(
jbe/bsw@0	1205 (unsigned char *)PQgetvalue(res, row, col), &binlen
jbe/bsw@0	1206 );
jbe/bsw@0	1207 if (!binval) {
jbe/bsw@0	1208 return luaL_error(L,
jbe/bsw@0	1209 "Could not allocate memory for binary unescaping."
jbe/bsw@0	1210 );
jbe/bsw@0	1211 }
jbe@412	1212 // ensure call of PQfreemem in case of out-of-memory error:
jbe@412	1213 conn->todo_PQfreemem = binval;
jbe@412	1214 // create Lua string:
jbe/bsw@0	1215 lua_pushlstring(L, binval, binlen);
jbe@412	1216 // free memory allocated by PQunescapeBytea:
jbe/bsw@0	1217 PQfreemem(binval);
jbe@412	1218 // avoid double call of PQfreemem later:
jbe@412	1219 conn->todo_PQfreemem = NULL;
jbe/bsw@0	1220 } else {
jbe/bsw@0	1221 lua_pushstring(L, PQgetvalue(res, row, col));
jbe/bsw@0	1222 }
jbe/bsw@0	1223 lua_rawseti(L, 6, col+1);
jbe/bsw@0	1224 }
jbe/bsw@0	1225 lua_rawseti(L, 5, row+1);
jbe/bsw@0	1226 }
jbe/bsw@0	1227 } else if (rows == 1) {
jbe/bsw@0	1228 for (col = 0; col < cols; col++) {
jbe/bsw@0	1229 if (PQgetisnull(res, 0, col)) {
jbe/bsw@0	1230 lua_pushnil(L);
jbe/bsw@0	1231 } else if (binary[col]) {
jbe/bsw@0	1232 size_t binlen;
jbe/bsw@0	1233 char *binval;
jbe@412	1234 // avoid cumulating memory leaks in case of previous out-of-memory errors:
jbe@412	1235 if (conn->todo_PQfreemem) {
jbe@412	1236 PQfreemem(conn->todo_PQfreemem);
jbe@412	1237 conn->todo_PQfreemem = NULL;
jbe@412	1238 }
jbe@412	1239 // Unescape binary data:
jbe/bsw@0	1240 binval = (char *)PQunescapeBytea(
jbe/bsw@0	1241 (unsigned char *)PQgetvalue(res, 0, col), &binlen
jbe/bsw@0	1242 );
jbe/bsw@0	1243 if (!binval) {
jbe/bsw@0	1244 return luaL_error(L,
jbe/bsw@0	1245 "Could not allocate memory for binary unescaping."
jbe/bsw@0	1246 );
jbe/bsw@0	1247 }
jbe@412	1248 // ensure call of PQfreemem in case of out-of-memory error:
jbe@412	1249 conn->todo_PQfreemem = binval;
jbe@412	1250 // create Lua string:
jbe/bsw@0	1251 lua_pushlstring(L, binval, binlen);
jbe@412	1252 // free memory allocated by PQunescapeBytea:
jbe/bsw@0	1253 PQfreemem(binval);
jbe@412	1254 // avoid double call of PQfreemem later:
jbe@412	1255 conn->todo_PQfreemem = NULL;
jbe/bsw@0	1256 } else {
jbe/bsw@0	1257 lua_pushstring(L, PQgetvalue(res, 0, col));
jbe/bsw@0	1258 }
jbe/bsw@0	1259 lua_rawseti(L, 5, col+1);
jbe/bsw@0	1260 }
jbe/bsw@0	1261 } else {
jbe/bsw@0	1262 // no row in optrow mode
jbe/bsw@0	1263 lua_pop(L, 1);
jbe/bsw@0	1264 lua_pushnil(L);
jbe/bsw@0	1265 }
jbe@23	1266 // save result in result list:
jbe/bsw@0	1267 lua_rawseti(L, 4, command_idx+1);
jbe@23	1268 // extra assertion:
jbe/bsw@0	1269 if (lua_gettop(L) != 4) abort(); // should not happen
jbe@23	1270 // free memory acquired by libpq:
jbe/bsw@0	1271 PQclear(res);
jbe@408	1272 // avoid double call of PQclear later:
jbe@408	1273 conn->todo_PQclear = NULL;
jbe/bsw@0	1274 }
jbe/bsw@0	1275 // trace callback at stack position 3
jbe/bsw@0	1276 // result at stack position 4 (top of stack)
jbe@23	1277 // if a trace callback is existent, then call:
jbe/bsw@0	1278 if (lua_toboolean(L, 3)) {
jbe/bsw@0	1279 lua_pushvalue(L, 3);
jbe/bsw@0	1280 lua_call(L, 0, 0);
jbe/bsw@0	1281 }
jbe@23	1282 // put result at stack position 3:
jbe@23	1283 lua_replace(L, 3);
jbe@23	1284 // get output converter to stack position 4:
jbe@23	1285 lua_getfield(L, 1, "output_converter");
jbe@374	1286 // get mutability state saver to stack position 5:
jbe@375	1287 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe@375	1288 lua_getfield(L, -1, "save_mutability_state");
jbe@375	1289 lua_replace(L, -2);
jbe@23	1290 // apply output converters and fill "_data" table according to column names:
jbe/bsw@0	1291 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0	1292 int mode;
jbe/bsw@0	1293 mode = modes[command_idx];
jbe@374	1294 lua_rawgeti(L, 3, command_idx+1); // raw result at stack position 6
jbe@374	1295 if (lua_toboolean(L, 6)) {
jbe@374	1296 lua_getfield(L, 6, "_column_info"); // column_info list at position 7
jbe@374	1297 cols = lua_rawlen(L, 7);
jbe/bsw@0	1298 if (mode == MONDELEFANT_QUERY_MODE_LIST) {
jbe@374	1299 rows = lua_rawlen(L, 6);
jbe/bsw@0	1300 for (row = 0; row < rows; row++) {
jbe@374	1301 lua_rawgeti(L, 6, row+1); // row at stack position 8
jbe@374	1302 lua_getfield(L, 8, "_data"); // _data table at stack position 9
jbe@375	1303 lua_getfield(L, 8, "_dirty"); // _dirty table at stack position 10
jbe/bsw@0	1304 for (col = 0; col < cols; col++) {
jbe@375	1305 lua_rawgeti(L, 7, col+1); // this column info at position 11
jbe@375	1306 lua_getfield(L, 11, "field_name"); // 12
jbe/bsw@0	1307 if (lua_toboolean(L, 4)) {
jbe/bsw@0	1308 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0	1309 lua_pushvalue(L, 1); // connection
jbe@374	1310 lua_rawgeti(L, 8, col+1); // raw-value
jbe@375	1311 lua_pushvalue(L, 11); // this column info
jbe@375	1312 lua_call(L, 3, 1); // converted value at position 13
jbe/bsw@0	1313 } else {
jbe@375	1314 lua_rawgeti(L, 8, col+1); // raw-value at position 13
jbe/bsw@0	1315 }
jbe@375	1316 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375	1317 lua_pushvalue(L, 12); // copy of field name
jbe@375	1318 lua_pushvalue(L, 5); // mutability state saver function
jbe@375	1319 lua_pushvalue(L, 13); // copy of value
jbe@375	1320 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375	1321 lua_rawset(L, 10); // store mutability state in _dirty table
jbe@375	1322 }
jbe@375	1323 lua_pushvalue(L, 13); // 14
jbe@374	1324 lua_rawseti(L, 8, col+1);
jbe@374	1325 lua_rawset(L, 9);
jbe@399	1326 lua_settop(L, 10);
jbe/bsw@0	1327 }
jbe@374	1328 lua_settop(L, 7);
jbe/bsw@0	1329 }
jbe/bsw@0	1330 } else {
jbe@374	1331 lua_getfield(L, 6, "_data"); // _data table at stack position 8
jbe@375	1332 lua_getfield(L, 6, "_dirty"); // _dirty table at stack position 9
jbe/bsw@0	1333 for (col = 0; col < cols; col++) {
jbe@375	1334 lua_rawgeti(L, 7, col+1); // this column info at position 10
jbe@375	1335 lua_getfield(L, 10, "field_name"); // 11
jbe/bsw@0	1336 if (lua_toboolean(L, 4)) {
jbe/bsw@0	1337 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0	1338 lua_pushvalue(L, 1); // connection
jbe@374	1339 lua_rawgeti(L, 6, col+1); // raw-value
jbe@375	1340 lua_pushvalue(L, 10); // this column info
jbe@375	1341 lua_call(L, 3, 1); // converted value at position 12
jbe/bsw@0	1342 } else {
jbe@375	1343 lua_rawgeti(L, 6, col+1); // raw-value at position 12
jbe/bsw@0	1344 }
jbe@375	1345 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375	1346 lua_pushvalue(L, 11); // copy of field name
jbe@375	1347 lua_pushvalue(L, 5); // mutability state saver function
jbe@375	1348 lua_pushvalue(L, 12); // copy of value
jbe@375	1349 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375	1350 lua_rawset(L, 9); // store mutability state in _dirty table
jbe@375	1351 }
jbe@375	1352 lua_pushvalue(L, 12); // 13
jbe@374	1353 lua_rawseti(L, 6, col+1);
jbe@374	1354 lua_rawset(L, 8);
jbe@399	1355 lua_settop(L, 9);
jbe/bsw@0	1356 }
jbe/bsw@0	1357 }
jbe/bsw@0	1358 }
jbe@374	1359 lua_settop(L, 5);
jbe/bsw@0	1360 }
jbe@23	1361 // return nil as first result value, followed by result lists/objects:
jbe/bsw@0	1362 lua_settop(L, 3);
jbe/bsw@0	1363 lua_pushnil(L);
jbe/bsw@0	1364 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0	1365 lua_rawgeti(L, 3, command_idx+1);
jbe/bsw@0	1366 }
jbe/bsw@0	1367 return command_count+1;
jbe/bsw@0	1368 }
jbe/bsw@0	1369
jbe@397	1370 // method "is_kind_of" of error objects:
jbe@397	1371 static int mondelefant_errorobject_is_kind_of(lua_State *L) {
jbe@397	1372 const char *errclass;
jbe@397	1373 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397	1374 errclass = luaL_checkstring(L, 2);
jbe@397	1375 lua_settop(L, 2);
jbe@397	1376 lua_getfield(L, 1, "code"); // 3
jbe@397	1377 luaL_argcheck(L,
jbe@397	1378 lua_type(L, 3) == LUA_TSTRING,
jbe@397	1379 1,
jbe@397	1380 "field 'code' of error object is not a string"
jbe@397	1381 );
jbe@397	1382 lua_pushboolean(L,
jbe@397	1383 mondelefant_check_error_class(lua_tostring(L, 3), errclass)
jbe@397	1384 );
jbe@397	1385 return 1;
jbe@397	1386 }
jbe@397	1387
jbe@397	1388 // method "wait" of database handles:
jbe@397	1389 static int mondelefant_conn_wait(lua_State *L) {
jbe@397	1390 int argc;
jbe@397	1391 // count number of arguments:
jbe@397	1392 argc = lua_gettop(L);
jbe@397	1393 // insert "try_wait" function/method at stack position 1:
jbe@397	1394 lua_pushcfunction(L, mondelefant_conn_try_wait);
jbe@397	1395 lua_insert(L, 1);
jbe@397	1396 // call "try_wait" method:
jbe@397	1397 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@397	1398 // check, if error occurred:
jbe@397	1399 if (lua_toboolean(L, 1)) {
jbe@397	1400 // raise error
jbe/bsw@0	1401 lua_settop(L, 1);
jbe/bsw@0	1402 return lua_error(L);
jbe/bsw@0	1403 } else {
jbe@397	1404 // return everything but nil error object:
jbe@397	1405 return lua_gettop(L) - 1;
jbe/bsw@0	1406 }
jbe/bsw@0	1407 }
jbe/bsw@0	1408
jbe@23	1409 // method "query" of database handles:
jbe/bsw@0	1410 static int mondelefant_conn_query(lua_State *L) {
jbe/bsw@0	1411 int argc;
jbe@23	1412 // count number of arguments:
jbe/bsw@0	1413 argc = lua_gettop(L);
jbe@23	1414 // insert "try_query" function/method at stack position 1:
jbe/bsw@0	1415 lua_pushcfunction(L, mondelefant_conn_try_query);
jbe@23	1416 lua_insert(L, 1);
jbe@23	1417 // call "try_query" method:
jbe@23	1418 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@23	1419 // check, if error occurred:
jbe@23	1420 if (lua_toboolean(L, 1)) {
jbe@397	1421 // raise error
jbe@397	1422 lua_settop(L, 1);
jbe@397	1423 return lua_error(L);
jbe/bsw@0	1424 } else {
jbe@23	1425 // return everything but nil error object:
jbe@23	1426 return lua_gettop(L) - 1;
jbe/bsw@0	1427 }
jbe/bsw@0	1428 }
jbe/bsw@0	1429
jbe@23	1430 // library function "set_class":
jbe/bsw@0	1431 static int mondelefant_set_class(lua_State *L) {
jbe@23	1432 // ensure that first argument is a database result list/object:
jbe/bsw@0	1433 lua_settop(L, 2);
jbe/bsw@0	1434 lua_getmetatable(L, 1); // 3
jbe/bsw@0	1435 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 4
jbe@64	1436 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 1, "not a database result");
jbe@23	1437 // ensure that second argument is a database class (model):
jbe/bsw@0	1438 lua_settop(L, 2);
jbe/bsw@0	1439 lua_getmetatable(L, 2); // 3
jbe/bsw@0	1440 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 4
jbe@64	1441 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 2, "not a database class");
jbe@23	1442 // set attribute "_class" of result list/object to given class:
jbe/bsw@0	1443 lua_settop(L, 2);
jbe/bsw@0	1444 lua_pushvalue(L, 2); // 3
jbe/bsw@0	1445 lua_setfield(L, 1, "_class");
jbe@23	1446 // test, if database result is a list (and not a single object):
jbe/bsw@0	1447 lua_getfield(L, 1, "_type"); // 3
jbe/bsw@0	1448 lua_pushliteral(L, "list"); // 4
jbe/bsw@0	1449 if (lua_rawequal(L, 3, 4)) {
jbe/bsw@0	1450 int i;
jbe@23	1451 // set attribute "_class" of all elements to given class:
jbe@64	1452 for (i=0; i < lua_rawlen(L, 1); i++) {
jbe/bsw@0	1453 lua_settop(L, 2);
jbe/bsw@0	1454 lua_rawgeti(L, 1, i+1); // 3
jbe/bsw@0	1455 lua_pushvalue(L, 2); // 4
jbe/bsw@0	1456 lua_setfield(L, 3, "_class");
jbe/bsw@0	1457 }
jbe/bsw@0	1458 }
jbe@23	1459 // return first argument:
jbe/bsw@0	1460 lua_settop(L, 1);
jbe/bsw@0	1461 return 1;
jbe/bsw@0	1462 }
jbe/bsw@0	1463
jbe@23	1464 // library function "new_class":
jbe/bsw@0	1465 static int mondelefant_new_class(lua_State *L) {
jbe@397	1466 // if no argument is given, use an empty table:
jbe@397	1467 if (lua_isnoneornil(L, 1)) {
jbe/bsw@0	1468 lua_settop(L, 0);
jbe/bsw@0	1469 lua_newtable(L); // 1
jbe@397	1470 } else {
jbe@397	1471 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397	1472 lua_settop(L, 1);
jbe/bsw@0	1473 }
jbe@23	1474 // set meta-table for database classes (models):
jbe@406	1475 luaL_setmetatable(L, MONDELEFANT_CLASS_MT_REGKEY);
jbe@23	1476 // check, if "prototype" attribute is not set:
jbe/bsw@0	1477 lua_pushliteral(L, "prototype"); // 2
jbe/bsw@0	1478 lua_rawget(L, 1); // 2
jbe/bsw@0	1479 if (!lua_toboolean(L, 2)) {
jbe@23	1480 // set "prototype" attribute to default prototype:
jbe/bsw@0	1481 lua_pushliteral(L, "prototype"); // 3
jbe@413	1482 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY); // 4
jbe/bsw@0	1483 lua_rawset(L, 1);
jbe/bsw@0	1484 }
jbe@23	1485 // set "object" attribute to empty table, unless it is already set:
jbe/bsw@0	1486 lua_settop(L, 1);
jbe/bsw@0	1487 lua_pushliteral(L, "object"); // 2
jbe/bsw@0	1488 lua_rawget(L, 1); // 2
jbe/bsw@0	1489 if (!lua_toboolean(L, 2)) {
jbe/bsw@0	1490 lua_pushliteral(L, "object"); // 3
jbe/bsw@0	1491 lua_newtable(L); // 4
jbe/bsw@0	1492 lua_rawset(L, 1);
jbe/bsw@0	1493 }
jbe@23	1494 // set "object_get" attribute to empty table, unless it is already set:
jbe/bsw@0	1495 lua_settop(L, 1);
jbe/bsw@0	1496 lua_pushliteral(L, "object_get"); // 2
jbe/bsw@0	1497 lua_rawget(L, 1); // 2
jbe/bsw@0	1498 if (!lua_toboolean(L, 2)) {
jbe/bsw@0	1499 lua_pushliteral(L, "object_get"); // 3
jbe/bsw@0	1500 lua_newtable(L); // 4
jbe/bsw@0	1501 lua_rawset(L, 1);
jbe/bsw@0	1502 }
jbe@23	1503 // set "object_set" attribute to empty table, unless it is already set:
jbe/bsw@0	1504 lua_settop(L, 1);
jbe/bsw@0	1505 lua_pushliteral(L, "object_set"); // 2
jbe/bsw@0	1506 lua_rawget(L, 1); // 2
jbe/bsw@0	1507 if (!lua_toboolean(L, 2)) {
jbe/bsw@0	1508 lua_pushliteral(L, "object_set"); // 3
jbe/bsw@0	1509 lua_newtable(L); // 4
jbe/bsw@0	1510 lua_rawset(L, 1);
jbe/bsw@0	1511 }
jbe@23	1512 // set "list" attribute to empty table, unless it is already set:
jbe/bsw@0	1513 lua_settop(L, 1);
jbe/bsw@0	1514 lua_pushliteral(L, "list"); // 2
jbe/bsw@0	1515 lua_rawget(L, 1); // 2
jbe/bsw@0	1516 if (!lua_toboolean(L, 2)) {
jbe/bsw@0	1517 lua_pushliteral(L, "list"); // 3
jbe/bsw@0	1518 lua_newtable(L); // 4
jbe/bsw@0	1519 lua_rawset(L, 1);
jbe/bsw@0	1520 }
jbe@23	1521 // set "references" attribute to empty table, unless it is already set:
jbe/bsw@0	1522 lua_settop(L, 1);
jbe/bsw@0	1523 lua_pushliteral(L, "references"); // 2
jbe/bsw@0	1524 lua_rawget(L, 1); // 2
jbe/bsw@0	1525 if (!lua_toboolean(L, 2)) {
jbe/bsw@0	1526 lua_pushliteral(L, "references"); // 3
jbe/bsw@0	1527 lua_newtable(L); // 4
jbe/bsw@0	1528 lua_rawset(L, 1);
jbe/bsw@0	1529 }
jbe@23	1530 // set "foreign_keys" attribute to empty table, unless it is already set:
jbe/bsw@0	1531 lua_settop(L, 1);
jbe/bsw@0	1532 lua_pushliteral(L, "foreign_keys"); // 2
jbe/bsw@0	1533 lua_rawget(L, 1); // 2
jbe/bsw@0	1534 if (!lua_toboolean(L, 2)) {
jbe/bsw@0	1535 lua_pushliteral(L, "foreign_keys"); // 3
jbe/bsw@0	1536 lua_newtable(L); // 4
jbe/bsw@0	1537 lua_rawset(L, 1);
jbe/bsw@0	1538 }
jbe@23	1539 // return table:
jbe/bsw@0	1540 lua_settop(L, 1);
jbe/bsw@0	1541 return 1;
jbe/bsw@0	1542 }
jbe/bsw@0	1543
jbe@23	1544 // method "get_reference" of classes (models):
jbe/bsw@0	1545 static int mondelefant_class_get_reference(lua_State *L) {
jbe/bsw@0	1546 lua_settop(L, 2);
jbe/bsw@0	1547 while (lua_toboolean(L, 1)) {
jbe@23	1548 // get "references" table:
jbe/bsw@0	1549 lua_getfield(L, 1, "references"); // 3
jbe@23	1550 // perform lookup:
jbe/bsw@0	1551 lua_pushvalue(L, 2); // 4
jbe/bsw@0	1552 lua_gettable(L, 3); // 4
jbe@23	1553 // return result, if lookup was successful:
jbe/bsw@0	1554 if (!lua_isnil(L, 4)) return 1;
jbe@23	1555 // replace current table by its prototype:
jbe/bsw@0	1556 lua_settop(L, 2);
jbe/bsw@0	1557 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0	1558 lua_rawget(L, 1); // 3
jbe/bsw@0	1559 lua_replace(L, 1);
jbe/bsw@0	1560 }
jbe@23	1561 // return nothing:
jbe/bsw@0	1562 return 0;
jbe/bsw@0	1563 }
jbe/bsw@0	1564
jbe@23	1565 // method "iterate_over_references" of classes (models):
jbe/bsw@0	1566 static int mondelefant_class_iterate_over_references(lua_State *L) {
jbe/bsw@0	1567 return luaL_error(L, "Reference iterator not implemented yet."); // TODO
jbe/bsw@0	1568 }
jbe/bsw@0	1569
jbe@23	1570 // method "get_foreign_key_reference_name" of classes (models):
jbe/bsw@0	1571 static int mondelefant_class_get_foreign_key_reference_name(lua_State *L) {
jbe/bsw@0	1572 lua_settop(L, 2);
jbe/bsw@0	1573 while (lua_toboolean(L, 1)) {
jbe@23	1574 // get "foreign_keys" table:
jbe/bsw@0	1575 lua_getfield(L, 1, "foreign_keys"); // 3
jbe@23	1576 // perform lookup:
jbe/bsw@0	1577 lua_pushvalue(L, 2); // 4
jbe/bsw@0	1578 lua_gettable(L, 3); // 4
jbe@23	1579 // return result, if lookup was successful:
jbe/bsw@0	1580 if (!lua_isnil(L, 4)) return 1;
jbe@23	1581 // replace current table by its prototype:
jbe/bsw@0	1582 lua_settop(L, 2);
jbe/bsw@0	1583 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0	1584 lua_rawget(L, 1); // 3
jbe/bsw@0	1585 lua_replace(L, 1);
jbe/bsw@0	1586 }
jbe@23	1587 // return nothing:
jbe/bsw@0	1588 return 0;
jbe/bsw@0	1589 }
jbe/bsw@0	1590
jbe@23	1591 // meta-method "__index" of database result lists and objects:
jbe/bsw@0	1592 static int mondelefant_result_index(lua_State *L) {
jbe/bsw@0	1593 const char *result_type;
jbe@23	1594 // only lookup, when key is a string not beginning with an underscore:
jbe/bsw@0	1595 if (lua_type(L, 2) != LUA_TSTRING \|\| lua_tostring(L, 2)[0] == '_') {
jbe@23	1596 return 0;
jbe/bsw@0	1597 }
jbe@384	1598 // value of "_class" attribute or default class on stack position 3:
jbe@23	1599 lua_settop(L, 2);
jbe/bsw@0	1600 lua_getfield(L, 1, "_class"); // 3
jbe/bsw@0	1601 if (!lua_toboolean(L, 3)) {
jbe/bsw@0	1602 lua_settop(L, 2);
jbe@413	1603 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY); // 3
jbe/bsw@0	1604 }
jbe@23	1605 // get value of "_type" attribute:
jbe/bsw@0	1606 lua_getfield(L, 1, "_type"); // 4
jbe/bsw@0	1607 result_type = lua_tostring(L, 4);
jbe@23	1608 // different lookup for lists and objects:
jbe@23	1609 if (result_type && !strcmp(result_type, "object")) { // object
jbe/bsw@0	1610 lua_settop(L, 3);
jbe@384	1611 // try inherited attributes, methods or getter functions:
jbe@383	1612 lua_pushvalue(L, 3); // 4
jbe@383	1613 while (lua_toboolean(L, 4)) {
jbe@383	1614 lua_getfield(L, 4, "object"); // 5
jbe@383	1615 lua_pushvalue(L, 2); // 6
jbe@383	1616 lua_gettable(L, 5); // 6
jbe@383	1617 if (!lua_isnil(L, 6)) return 1;
jbe@383	1618 lua_settop(L, 4);
jbe@383	1619 lua_getfield(L, 4, "object_get"); // 5
jbe@383	1620 lua_pushvalue(L, 2); // 6
jbe@383	1621 lua_gettable(L, 5); // 6
jbe@383	1622 if (lua_toboolean(L, 6)) {
jbe@383	1623 lua_pushvalue(L, 1); // 7
jbe@383	1624 lua_call(L, 1, 1); // 6
jbe/bsw@0	1625 return 1;
jbe/bsw@0	1626 }
jbe@383	1627 lua_settop(L, 4);
jbe@383	1628 lua_pushliteral(L, "prototype"); // 5
jbe@383	1629 lua_rawget(L, 4); // 5
jbe@383	1630 lua_replace(L, 4);
jbe/bsw@0	1631 }
jbe@383	1632 lua_settop(L, 3);
jbe/bsw@0	1633 // try primary keys of referenced objects:
jbe/bsw@0	1634 lua_pushcfunction(L,
jbe/bsw@0	1635 mondelefant_class_get_foreign_key_reference_name
jbe@383	1636 ); // 4
jbe@383	1637 lua_pushvalue(L, 3); // 5
jbe@383	1638 lua_pushvalue(L, 2); // 6
jbe@383	1639 lua_call(L, 2, 1); // 4
jbe@383	1640 if (!lua_isnil(L, 4)) {
jbe@383	1641 // reference name at stack position 4
jbe@383	1642 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@382	1643 lua_pushvalue(L, 3); // 6
jbe@383	1644 lua_pushvalue(L, 4); // 7
jbe@383	1645 lua_call(L, 2, 1); // reference info at stack position 5
jbe@383	1646 lua_getfield(L, 1, "_ref"); // 6
jbe@383	1647 lua_getfield(L, 5, "ref"); // 7
jbe@383	1648 lua_gettable(L, 6); // 7
jbe@383	1649 if (!lua_isnil(L, 7)) {
jbe@383	1650 if (lua_toboolean(L, 7)) {
jbe@383	1651 lua_getfield(L, 5, "that_key"); // 8
jbe@383	1652 if (lua_isnil(L, 8)) {
jbe/bsw@0	1653 return luaL_error(L, "Missing 'that_key' entry in model reference.");
jbe/bsw@0	1654 }
jbe@383	1655 lua_gettable(L, 7); // 8
jbe/bsw@0	1656 } else {
jbe/bsw@0	1657 lua_pushnil(L);
jbe/bsw@0	1658 }
jbe/bsw@0	1659 return 1;
jbe/bsw@0	1660 }
jbe/bsw@0	1661 }
jbe@383	1662 lua_settop(L, 3);
jbe@383	1663 lua_getfield(L, 1, "_data"); // _data table on stack position 4
jbe/bsw@0	1664 // try cached referenced object (or cached NULL reference):
jbe@383	1665 lua_getfield(L, 1, "_ref"); // 5
jbe@383	1666 lua_pushvalue(L, 2); // 6
jbe@383	1667 lua_gettable(L, 5); // 6
jbe@383	1668 if (lua_isboolean(L, 6) && !lua_toboolean(L, 6)) {
jbe/bsw@0	1669 lua_pushnil(L);
jbe/bsw@0	1670 return 1;
jbe@383	1671 } else if (!lua_isnil(L, 6)) {
jbe/bsw@0	1672 return 1;
jbe/bsw@0	1673 }
jbe@383	1674 lua_settop(L, 4);
jbe/bsw@0	1675 // try to load a referenced object:
jbe@383	1676 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@383	1677 lua_pushvalue(L, 3); // 6
jbe@383	1678 lua_pushvalue(L, 2); // 7
jbe@383	1679 lua_call(L, 2, 1); // 5
jbe@383	1680 if (!lua_isnil(L, 5)) {
jbe/bsw@0	1681 lua_settop(L, 2);
jbe/bsw@0	1682 lua_getfield(L, 1, "load"); // 3
jbe/bsw@0	1683 lua_pushvalue(L, 1); // 4 (self)
jbe/bsw@0	1684 lua_pushvalue(L, 2); // 5
jbe/bsw@0	1685 lua_call(L, 2, 0);
jbe/bsw@0	1686 lua_settop(L, 2);
jbe/bsw@0	1687 lua_getfield(L, 1, "_ref"); // 3
jbe/bsw@0	1688 lua_pushvalue(L, 2); // 4
jbe/bsw@0	1689 lua_gettable(L, 3); // 4
jbe/bsw@0	1690 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) lua_pushnil(L); // TODO: use special object instead of false
jbe/bsw@0	1691 return 1;
jbe/bsw@0	1692 }
jbe@383	1693 lua_settop(L, 4);
jbe@415	1694 // check if proxy access to document in special column is enabled:
jbe@383	1695 lua_getfield(L, 3, "document_column"); // 5
jbe@383	1696 if (lua_toboolean(L, 5)) {
jbe@415	1697 // if yes, then proxy access:
jbe@383	1698 lua_gettable(L, 4); // 5
jbe@383	1699 if (!lua_isnil(L, 5)) {
jbe@383	1700 lua_pushvalue(L, 2); // 6
jbe@383	1701 lua_gettable(L, 5); // 6
jbe@383	1702 }
jbe@415	1703 } else {
jbe@415	1704 // else use _data table:
jbe@415	1705 lua_pushvalue(L, 2); // 6
jbe@415	1706 lua_gettable(L, 4); // 6
jbe@383	1707 }
jbe@415	1708 return 1; // return element at stack position 5 or 6
jbe@23	1709 } else if (result_type && !strcmp(result_type, "list")) { // list
jbe/bsw@0	1710 lua_settop(L, 3);
jbe/bsw@0	1711 // try inherited list attributes or methods:
jbe/bsw@0	1712 while (lua_toboolean(L, 3)) {
jbe/bsw@0	1713 lua_getfield(L, 3, "list"); // 4
jbe/bsw@0	1714 lua_pushvalue(L, 2); // 5
jbe/bsw@0	1715 lua_gettable(L, 4); // 5
jbe/bsw@0	1716 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0	1717 lua_settop(L, 3);
jbe/bsw@0	1718 lua_pushliteral(L, "prototype"); // 4
jbe/bsw@0	1719 lua_rawget(L, 3); // 4
jbe/bsw@0	1720 lua_replace(L, 3);
jbe/bsw@0	1721 }
jbe/bsw@0	1722 }
jbe@23	1723 // return nothing:
jbe/bsw@0	1724 return 0;
jbe/bsw@0	1725 }
jbe/bsw@0	1726
jbe@23	1727 // meta-method "__newindex" of database result lists and objects:
jbe/bsw@0	1728 static int mondelefant_result_newindex(lua_State *L) {
jbe/bsw@0	1729 const char *result_type;
jbe@23	1730 // perform rawset, unless key is a string not starting with underscore:
jbe/bsw@0	1731 lua_settop(L, 3);
jbe/bsw@0	1732 if (lua_type(L, 2) != LUA_TSTRING \|\| lua_tostring(L, 2)[0] == '_') {
jbe/bsw@0	1733 lua_rawset(L, 1);
jbe/bsw@0	1734 return 1;
jbe/bsw@0	1735 }
jbe@384	1736 // value of "_class" attribute or default class on stack position 4:
jbe@384	1737 lua_settop(L, 3);
jbe/bsw@0	1738 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0	1739 if (!lua_toboolean(L, 4)) {
jbe/bsw@0	1740 lua_settop(L, 3);
jbe@413	1741 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY); // 4
jbe/bsw@0	1742 }
jbe@23	1743 // get value of "_type" attribute:
jbe/bsw@0	1744 lua_getfield(L, 1, "_type"); // 5
jbe/bsw@0	1745 result_type = lua_tostring(L, 5);
jbe@378	1746 // distinguish between lists and objects:
jbe@378	1747 if (result_type && !strcmp(result_type, "object")) { // objects
jbe@378	1748 lua_settop(L, 4);
jbe@378	1749 // try object setter functions:
jbe@384	1750 lua_pushvalue(L, 4); // 5
jbe@384	1751 while (lua_toboolean(L, 5)) {
jbe@384	1752 lua_getfield(L, 5, "object_set"); // 6
jbe@384	1753 lua_pushvalue(L, 2); // 7
jbe@384	1754 lua_gettable(L, 6); // 7
jbe@384	1755 if (lua_toboolean(L, 7)) {
jbe@384	1756 lua_pushvalue(L, 1); // 8
jbe@384	1757 lua_pushvalue(L, 3); // 9
jbe@378	1758 lua_call(L, 2, 0);
jbe@378	1759 return 0;
jbe@378	1760 }
jbe@384	1761 lua_settop(L, 5);
jbe@384	1762 lua_pushliteral(L, "prototype"); // 6
jbe@384	1763 lua_rawget(L, 5); // 6
jbe@384	1764 lua_replace(L, 5);
jbe@378	1765 }
jbe@384	1766 lua_settop(L, 4);
jbe@384	1767 lua_getfield(L, 1, "_data"); // _data table on stack position 5
jbe/bsw@0	1768 // check, if a object reference is changed:
jbe@384	1769 lua_pushcfunction(L, mondelefant_class_get_reference); // 6
jbe@384	1770 lua_pushvalue(L, 4); // 7
jbe@384	1771 lua_pushvalue(L, 2); // 8
jbe@384	1772 lua_call(L, 2, 1); // 6
jbe@384	1773 if (!lua_isnil(L, 6)) {
jbe/bsw@0	1774 // store object in _ref table (use false for nil): // TODO: use special object instead of false
jbe@384	1775 lua_getfield(L, 1, "_ref"); // 7
jbe@384	1776 lua_pushvalue(L, 2); // 8
jbe@384	1777 if (lua_isnil(L, 3)) lua_pushboolean(L, 0); // 9
jbe@384	1778 else lua_pushvalue(L, 3); // 9
jbe@384	1779 lua_settable(L, 7);
jbe@384	1780 lua_settop(L, 6);
jbe/bsw@0	1781 // delete referencing key from _data table:
jbe@384	1782 lua_getfield(L, 6, "this_key"); // 7
jbe@384	1783 if (lua_isnil(L, 7)) {
jbe/bsw@0	1784 return luaL_error(L, "Missing 'this_key' entry in model reference.");
jbe/bsw@0	1785 }
jbe@384	1786 lua_pushvalue(L, 7); // 8
jbe@384	1787 lua_pushnil(L); // 9
jbe@384	1788 lua_settable(L, 5);
jbe@384	1789 lua_getfield(L, 1, "_dirty"); // 8
jbe@384	1790 lua_pushvalue(L, 7); // 9
jbe@384	1791 lua_pushboolean(L, 1); // 10
jbe@384	1792 lua_settable(L, 8);
jbe@384	1793 return 0;
jbe@384	1794 }
jbe@384	1795 lua_settop(L, 5);
jbe@384	1796 // check proxy access to document in special column:
jbe@384	1797 lua_getfield(L, 4, "document_column"); // 6
jbe@384	1798 if (lua_toboolean(L, 6)) {
jbe@414	1799 lua_gettable(L, 5); // 6
jbe@414	1800 if (lua_isnil(L, 6)) {
jbe@414	1801 return luaL_error(L, "Cannot write to document column: document is nil");
jbe@384	1802 }
jbe@414	1803 lua_pushvalue(L, 2); // 7
jbe@414	1804 lua_pushvalue(L, 3); // 8
jbe@414	1805 lua_settable(L, 6);
jbe@414	1806 return 0;
jbe@384	1807 }
jbe@384	1808 lua_settop(L, 5);
jbe@384	1809 // store value in data field info:
jbe@384	1810 lua_pushvalue(L, 2); // 6
jbe@384	1811 lua_pushvalue(L, 3); // 7
jbe@384	1812 lua_settable(L, 5);
jbe@384	1813 lua_settop(L, 4);
jbe@384	1814 // mark field as dirty (needs to be UPDATEd on save):
jbe@384	1815 lua_getfield(L, 1, "_dirty"); // 5
jbe@384	1816 lua_pushvalue(L, 2); // 6
jbe@384	1817 lua_pushboolean(L, 1); // 7
jbe@384	1818 lua_settable(L, 5);
jbe@384	1819 lua_settop(L, 4);
jbe@384	1820 // reset reference cache, if neccessary:
jbe@384	1821 lua_pushcfunction(L,
jbe@384	1822 mondelefant_class_get_foreign_key_reference_name
jbe@384	1823 ); // 5
jbe@384	1824 lua_pushvalue(L, 4); // 6
jbe@384	1825 lua_pushvalue(L, 2); // 7
jbe@384	1826 lua_call(L, 2, 1); // 5
jbe@384	1827 if (!lua_isnil(L, 5)) {
jbe@384	1828 lua_getfield(L, 1, "_ref"); // 6
jbe@382	1829 lua_pushvalue(L, 5); // 7
jbe@382	1830 lua_pushnil(L); // 8
jbe@382	1831 lua_settable(L, 6);
jbe/bsw@0	1832 }
jbe/bsw@0	1833 return 0;
jbe@23	1834 } else { // non-objects (i.e. lists)
jbe@23	1835 // perform rawset:
jbe/bsw@0	1836 lua_settop(L, 3);
jbe/bsw@0	1837 lua_rawset(L, 1);
jbe/bsw@0	1838 return 0;
jbe/bsw@0	1839 }
jbe/bsw@0	1840 }
jbe/bsw@0	1841
jbe@416	1842 // meta-method "__index" of column proxy:
jbe@416	1843 static int mondelefant_columns_index(lua_State *L) {
jbe@416	1844 luaL_checktype(L, 1, LUA_TTABLE);
jbe@416	1845 lua_settop(L, 2);
jbe@416	1846 lua_rawgetp(L, 1, MONDELEFANT_COLUMNS_RESULT_LUKEY); // 3
jbe@416	1847 lua_getfield(L, 3, "_data"); // 4
jbe@416	1848 lua_pushvalue(L, 2); // 5
jbe@416	1849 lua_gettable(L, 4); // 5
jbe@416	1850 return 1;
jbe@416	1851 }
jbe@416	1852
jbe@416	1853 // meta-method "__newindex" of column proxy:
jbe@416	1854 static int mondelefant_columns_newindex(lua_State *L) {
jbe@416	1855 luaL_checktype(L, 1, LUA_TTABLE);
jbe@416	1856 lua_settop(L, 3);
jbe@416	1857 lua_rawgetp(L, 1, MONDELEFANT_COLUMNS_RESULT_LUKEY); // 4
jbe@416	1858 lua_getfield(L, 4, "_data"); // 5
jbe@416	1859 lua_getfield(L, 4, "_dirty"); // 6
jbe@416	1860 lua_pushvalue(L, 2);
jbe@416	1861 lua_pushvalue(L, 3);
jbe@416	1862 lua_settable(L, 5);
jbe@416	1863 lua_pushvalue(L, 2);
jbe@416	1864 lua_pushboolean(L, 1);
jbe@416	1865 lua_settable(L, 6);
jbe@416	1866 return 0;
jbe@416	1867 }
jbe@416	1868
jbe@23	1869 // meta-method "__index" of classes (models):
jbe/bsw@0	1870 static int mondelefant_class_index(lua_State *L) {
jbe@23	1871 // perform lookup in prototype:
jbe/bsw@0	1872 lua_settop(L, 2);
jbe/bsw@0	1873 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0	1874 lua_rawget(L, 1); // 3
jbe/bsw@0	1875 lua_pushvalue(L, 2); // 4
jbe/bsw@0	1876 lua_gettable(L, 3); // 4
jbe/bsw@0	1877 return 1;
jbe/bsw@0	1878 }
jbe/bsw@0	1879
jbe@23	1880 // registration information for functions of library:
jbe/bsw@0	1881 static const struct luaL_Reg mondelefant_module_functions[] = {
jbe/bsw@0	1882 {"connect", mondelefant_connect},
jbe/bsw@0	1883 {"set_class", mondelefant_set_class},
jbe/bsw@0	1884 {"new_class", mondelefant_new_class},
jbe/bsw@0	1885 {NULL, NULL}
jbe/bsw@0	1886 };
jbe/bsw@0	1887
jbe@23	1888 // registration information for meta-methods of database connections:
jbe/bsw@0	1889 static const struct luaL_Reg mondelefant_conn_mt_functions[] = {
jbe/bsw@0	1890 {"__gc", mondelefant_conn_free},
jbe/bsw@0	1891 {"__index", mondelefant_conn_index},
jbe/bsw@0	1892 {"__newindex", mondelefant_conn_newindex},
jbe/bsw@0	1893 {NULL, NULL}
jbe/bsw@0	1894 };
jbe/bsw@0	1895
jbe@23	1896 // registration information for methods of database connections:
jbe/bsw@0	1897 static const struct luaL_Reg mondelefant_conn_methods[] = {
jbe/bsw@0	1898 {"close", mondelefant_conn_close},
jbe/bsw@0	1899 {"is_ok", mondelefant_conn_is_ok},
jbe/bsw@0	1900 {"get_transaction_status", mondelefant_conn_get_transaction_status},
jbe@397	1901 {"try_wait", mondelefant_conn_try_wait},
jbe@393	1902 {"wait", mondelefant_conn_wait},
jbe/bsw@0	1903 {"create_list", mondelefant_conn_create_list},
jbe/bsw@0	1904 {"create_object", mondelefant_conn_create_object},
jbe/bsw@0	1905 {"quote_string", mondelefant_conn_quote_string},
jbe/bsw@0	1906 {"quote_binary", mondelefant_conn_quote_binary},
jbe/bsw@0	1907 {"assemble_command", mondelefant_conn_assemble_command},
jbe/bsw@0	1908 {"try_query", mondelefant_conn_try_query},
jbe/bsw@0	1909 {"query", mondelefant_conn_query},
jbe/bsw@0	1910 {NULL, NULL}
jbe/bsw@0	1911 };
jbe/bsw@0	1912
jbe@23	1913 // registration information for meta-methods of error objects:
jbe/bsw@0	1914 static const struct luaL_Reg mondelefant_errorobject_mt_functions[] = {
jbe/bsw@0	1915 {NULL, NULL}
jbe/bsw@0	1916 };
jbe/bsw@0	1917
jbe@23	1918 // registration information for methods of error objects:
jbe/bsw@0	1919 static const struct luaL_Reg mondelefant_errorobject_methods[] = {
jbe@397	1920 {"escalate", lua_error},
jbe/bsw@0	1921 {"is_kind_of", mondelefant_errorobject_is_kind_of},
jbe/bsw@0	1922 {NULL, NULL}
jbe/bsw@0	1923 };
jbe/bsw@0	1924
jbe@23	1925 // registration information for meta-methods of database result lists/objects:
jbe/bsw@0	1926 static const struct luaL_Reg mondelefant_result_mt_functions[] = {
jbe/bsw@0	1927 {"__index", mondelefant_result_index},
jbe/bsw@0	1928 {"__newindex", mondelefant_result_newindex},
jbe/bsw@0	1929 {NULL, NULL}
jbe/bsw@0	1930 };
jbe/bsw@0	1931
jbe@416	1932 // registration information for meta-methods of classes (models):
jbe/bsw@0	1933 static const struct luaL_Reg mondelefant_class_mt_functions[] = {
jbe/bsw@0	1934 {"__index", mondelefant_class_index},
jbe/bsw@0	1935 {NULL, NULL}
jbe/bsw@0	1936 };
jbe/bsw@0	1937
jbe@23	1938 // registration information for methods of classes (models):
jbe/bsw@0	1939 static const struct luaL_Reg mondelefant_class_methods[] = {
jbe/bsw@0	1940 {"get_reference", mondelefant_class_get_reference},
jbe/bsw@0	1941 {"iterate_over_references", mondelefant_class_iterate_over_references},
jbe/bsw@0	1942 {"get_foreign_key_reference_name",
jbe/bsw@0	1943 mondelefant_class_get_foreign_key_reference_name},
jbe/bsw@0	1944 {NULL, NULL}
jbe/bsw@0	1945 };
jbe/bsw@0	1946
jbe@23	1947 // registration information for methods of database result objects (not lists!):
jbe/bsw@0	1948 static const struct luaL_Reg mondelefant_object_methods[] = {
jbe/bsw@0	1949 {NULL, NULL}
jbe/bsw@0	1950 };
jbe/bsw@0	1951
jbe@23	1952 // registration information for methods of database result lists (not single objects!):
jbe/bsw@0	1953 static const struct luaL_Reg mondelefant_list_methods[] = {
jbe/bsw@0	1954 {NULL, NULL}
jbe/bsw@0	1955 };
jbe/bsw@0	1956
jbe@416	1957 // registration information for meta-methods of column proxy:
jbe@416	1958 static const struct luaL_Reg mondelefant_columns_mt_functions[] = {
jbe@416	1959 {"__index", mondelefant_columns_index},
jbe@416	1960 {"__newindex", mondelefant_columns_newindex},
jbe@416	1961 {NULL, NULL}
jbe@416	1962 };
jbe@416	1963
jbe@23	1964 // luaopen function to initialize/register library:
jbe/bsw@0	1965 int luaopen_mondelefant_native(lua_State *L) {
jbe/bsw@0	1966 lua_settop(L, 0);
jbe@416	1967
jbe@416	1968 lua_newtable(L); // meta-table for columns proxy
jbe@416	1969 luaL_setfuncs(L, mondelefant_columns_mt_functions, 0);
jbe@416	1970 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_COLUMNS_MT_REGKEY);
jbe@416	1971
jbe/bsw@0	1972 lua_newtable(L); // module at stack position 1
jbe@64	1973 luaL_setfuncs(L, mondelefant_module_functions, 0);
jbe/bsw@0	1974
jbe/bsw@0	1975 lua_pushvalue(L, 1); // 2
jbe/bsw@0	1976 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe/bsw@0	1977
jbe/bsw@0	1978 lua_newtable(L); // 2
jbe/bsw@0	1979 // NOTE: only PostgreSQL is supported yet:
jbe@64	1980 luaL_setfuncs(L, mondelefant_conn_methods, 0);
jbe/bsw@0	1981 lua_setfield(L, 1, "postgresql_connection_prototype");
jbe/bsw@0	1982 lua_newtable(L); // 2
jbe/bsw@0	1983 lua_setfield(L, 1, "connection_prototype");
jbe/bsw@0	1984
jbe/bsw@0	1985 luaL_newmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe@64	1986 luaL_setfuncs(L, mondelefant_conn_mt_functions, 0);
jbe/bsw@0	1987 lua_settop(L, 1);
jbe/bsw@0	1988 luaL_newmetatable(L, MONDELEFANT_RESULT_MT_REGKEY); // 2
jbe@64	1989 luaL_setfuncs(L, mondelefant_result_mt_functions, 0);
jbe/bsw@0	1990 lua_setfield(L, 1, "result_metatable");
jbe/bsw@0	1991 luaL_newmetatable(L, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe@64	1992 luaL_setfuncs(L, mondelefant_class_mt_functions, 0);
jbe/bsw@0	1993 lua_setfield(L, 1, "class_metatable");
jbe/bsw@0	1994
jbe/bsw@0	1995 lua_newtable(L); // 2
jbe@272	1996 luaL_setfuncs(L, mondelefant_class_methods, 0);
jbe/bsw@0	1997 lua_newtable(L); // 3
jbe@64	1998 luaL_setfuncs(L, mondelefant_object_methods, 0);
jbe/bsw@0	1999 lua_setfield(L, 2, "object");
jbe/bsw@0	2000 lua_newtable(L); // 3
jbe/bsw@0	2001 lua_setfield(L, 2, "object_get");
jbe/bsw@0	2002 lua_newtable(L); // 3
jbe/bsw@0	2003 lua_setfield(L, 2, "object_set");
jbe/bsw@0	2004 lua_newtable(L); // 3
jbe@64	2005 luaL_setfuncs(L, mondelefant_list_methods, 0);
jbe/bsw@0	2006 lua_setfield(L, 2, "list");
jbe/bsw@0	2007 lua_newtable(L); // 3
jbe/bsw@0	2008 lua_setfield(L, 2, "references");
jbe/bsw@0	2009 lua_newtable(L); // 3
jbe/bsw@0	2010 lua_setfield(L, 2, "foreign_keys");
jbe/bsw@0	2011 lua_pushvalue(L, 2); // 3
jbe/bsw@0	2012 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY);
jbe/bsw@0	2013 lua_setfield(L, 1, "class_prototype");
jbe/bsw@0	2014
jbe/bsw@0	2015 luaL_newmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY); // 2
jbe@64	2016 luaL_setfuncs(L, mondelefant_errorobject_mt_functions, 0);
jbe/bsw@0	2017 lua_newtable(L); // 3
jbe@64	2018 luaL_setfuncs(L, mondelefant_errorobject_methods, 0);
jbe/bsw@0	2019 lua_setfield(L, 2, "__index");
jbe/bsw@0	2020 lua_setfield(L, 1, "errorobject_metatable");
jbe/bsw@0	2021
jbe/bsw@0	2022 return 1;
jbe/bsw@0	2023 }