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annotate libraries/mondelefant/mondelefant_native.c @ 40:ed00b972f40e

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Allow mondelefant.connect to be called with an explicit "conninfo" string
author jbe
date Sat Oct 16 17:49:11 2010 +0200 (2010-10-16)
parents 3a6fe8663b26
children 3d43a5cf17c1
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/bsw@0 7
jbe@23 8 // NOTE: Comments with format "// <number>" denote the Lua stack position
jbe@23 9
jbe@23 10 // prefix for all Lua registry entries of this library:
jbe@23 11 #define MONDELEFANT_REGKEY "e449ba8d9a53d353_mondelefant_"
jbe/bsw@0 12
jbe@23 13 // registry key of module "mondelefant_native":
jbe@23 14 #define MONDELEFANT_MODULE_REGKEY (MONDELEFANT_REGKEY "module")
jbe@23 15 // registry key of meta-table for database connections:
jbe@23 16 #define MONDELEFANT_CONN_MT_REGKEY (MONDELEFANT_REGKEY "connection")
jbe@23 17 // registry key of table storing connection specific data:
jbe@23 18 #define MONDELEFANT_CONN_DATA_REGKEY (MONDELEFANT_REGKEY "connection_data")
jbe@23 19 // registry key of meta-table for database result lists and objects:
jbe@23 20 #define MONDELEFANT_RESULT_MT_REGKEY (MONDELEFANT_REGKEY "result")
jbe@23 21 // registry key of meta-table for database error objects:
jbe@23 22 #define MONDELEFANT_ERROROBJECT_MT_REGKEY (MONDELEFANT_REGKEY "errorobject")
jbe@23 23 // registry key of meta-table for models (named classes here):
jbe@23 24 #define MONDELEFANT_CLASS_MT_REGKEY (MONDELEFANT_REGKEY "class")
jbe@23 25 // registry key of default prototype for models/classes:
jbe@23 26 #define MONDELEFANT_CLASS_PROTO_REGKEY (MONDELEFANT_REGKEY "class_proto")
jbe/bsw@0 27
jbe@23 28 // C-structure for database connection userdata:
jbe/bsw@0 29 typedef struct {
jbe/bsw@0 30 PGconn *pgconn;
jbe/bsw@0 31 int server_encoding;
jbe/bsw@0 32 } mondelefant_conn_t;
jbe@23 33 #define MONDELEFANT_SERVER_ENCODING_ASCII 0
jbe@23 34 #define MONDELEFANT_SERVER_ENCODING_UTF8 1
jbe/bsw@0 35
jbe@23 36 // transform codepoint-position to byte-position for a given UTF-8 string:
jbe/bsw@0 37 static size_t utf8_position_to_byte(const char *str, size_t utf8pos) {
jbe/bsw@0 38 size_t bytepos;
jbe/bsw@0 39 for (bytepos = 0; utf8pos > 0; bytepos++) {
jbe/bsw@0 40 uint8_t c;
jbe/bsw@0 41 c = ((const uint8_t *)str)[bytepos];
jbe/bsw@0 42 if (!c) break;
jbe/bsw@0 43 if (c <= 0x7f || c >= 0xc0) utf8pos--;
jbe/bsw@0 44 }
jbe/bsw@0 45 return bytepos;
jbe/bsw@0 46 }
jbe/bsw@0 47
jbe@23 48 // PostgreSQL's OID for binary data type (bytea):
jbe/bsw@0 49 #define MONDELEFANT_POSTGRESQL_BINARY_OID ((Oid)17)
jbe/bsw@0 50
jbe@23 51 // mapping a PostgreSQL type given by its OID to a string identifier:
jbe/bsw@0 52 static const char *mondelefant_oid_to_typestr(Oid oid) {
jbe/bsw@0 53 switch (oid) {
jbe/bsw@0 54 case 16: return "bool";
jbe/bsw@0 55 case 17: return "bytea";
jbe/bsw@0 56 case 18: return "char";
jbe/bsw@0 57 case 19: return "name";
jbe/bsw@0 58 case 20: return "int8";
jbe/bsw@0 59 case 21: return "int2";
jbe/bsw@0 60 case 23: return "int4";
jbe/bsw@0 61 case 25: return "text";
jbe/bsw@0 62 case 26: return "oid";
jbe/bsw@0 63 case 27: return "tid";
jbe/bsw@0 64 case 28: return "xid";
jbe/bsw@0 65 case 29: return "cid";
jbe/bsw@0 66 case 600: return "point";
jbe/bsw@0 67 case 601: return "lseg";
jbe/bsw@0 68 case 602: return "path";
jbe/bsw@0 69 case 603: return "box";
jbe/bsw@0 70 case 604: return "polygon";
jbe/bsw@0 71 case 628: return "line";
jbe/bsw@0 72 case 700: return "float4";
jbe/bsw@0 73 case 701: return "float8";
jbe/bsw@0 74 case 705: return "unknown";
jbe/bsw@0 75 case 718: return "circle";
jbe/bsw@0 76 case 790: return "money";
jbe/bsw@0 77 case 829: return "macaddr";
jbe/bsw@0 78 case 869: return "inet";
jbe/bsw@0 79 case 650: return "cidr";
jbe/bsw@0 80 case 1042: return "bpchar";
jbe/bsw@0 81 case 1043: return "varchar";
jbe/bsw@0 82 case 1082: return "date";
jbe/bsw@0 83 case 1083: return "time";
jbe/bsw@0 84 case 1114: return "timestamp";
jbe/bsw@0 85 case 1184: return "timestamptz";
jbe/bsw@0 86 case 1186: return "interval";
jbe/bsw@0 87 case 1266: return "timetz";
jbe/bsw@0 88 case 1560: return "bit";
jbe/bsw@0 89 case 1562: return "varbit";
jbe/bsw@0 90 case 1700: return "numeric";
jbe/bsw@0 91 default: return NULL;
jbe/bsw@0 92 }
jbe/bsw@0 93 }
jbe/bsw@0 94
jbe@23 95 // This library maps PostgreSQL's error codes to CamelCase string
jbe@23 96 // identifiers, which consist of CamelCase identifiers and are seperated
jbe@23 97 // by dots (".") (no leading or trailing dots).
jbe@23 98 // There are additional error identifiers which do not have a corresponding
jbe@23 99 // PostgreSQL error associated with it.
jbe@23 100
jbe@23 101 // matching start of local variable 'pgcode' against string 'incode',
jbe@23 102 // returning string 'outcode' on match:
jbe/bsw@0 103 #define mondelefant_errcode_item(incode, outcode) \
jbe/bsw@0 104 if (!strncmp(pgcode, (incode), strlen(incode))) return outcode; else
jbe/bsw@0 105
jbe@23 106 // additional error identifiers without corresponding PostgreSQL error:
jbe/bsw@0 107 #define MONDELEFANT_ERRCODE_UNKNOWN "unknown"
jbe/bsw@0 108 #define MONDELEFANT_ERRCODE_CONNECTION "ConnectionException"
jbe/bsw@0 109 #define MONDELEFANT_ERRCODE_RESULTCOUNT_LOW "WrongResultSetCount.ResultSetMissing"
jbe/bsw@0 110 #define MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH "WrongResultSetCount.TooManyResults"
jbe/bsw@0 111 #define MONDELEFANT_ERRCODE_QUERY1_NO_ROWS "NoData.OneRowExpected"
jbe/bsw@0 112 #define MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS "CardinalityViolation.OneRowExpected"
jbe/bsw@0 113
jbe@23 114 // mapping PostgreSQL error code to error code as returned by this library:
jbe/bsw@0 115 static const char *mondelefant_translate_errcode(const char *pgcode) {
jbe/bsw@0 116 if (!pgcode) abort(); // should not happen
jbe/bsw@0 117 mondelefant_errcode_item("02", "NoData")
jbe/bsw@0 118 mondelefant_errcode_item("03", "SqlStatementNotYetComplete")
jbe/bsw@0 119 mondelefant_errcode_item("08", "ConnectionException")
jbe/bsw@0 120 mondelefant_errcode_item("09", "TriggeredActionException")
jbe/bsw@0 121 mondelefant_errcode_item("0A", "FeatureNotSupported")
jbe/bsw@0 122 mondelefant_errcode_item("0B", "InvalidTransactionInitiation")
jbe/bsw@0 123 mondelefant_errcode_item("0F", "LocatorException")
jbe/bsw@0 124 mondelefant_errcode_item("0L", "InvalidGrantor")
jbe/bsw@0 125 mondelefant_errcode_item("0P", "InvalidRoleSpecification")
jbe/bsw@0 126 mondelefant_errcode_item("21", "CardinalityViolation")
jbe/bsw@0 127 mondelefant_errcode_item("22", "DataException")
jbe/bsw@0 128 mondelefant_errcode_item("23001", "IntegrityConstraintViolation.RestrictViolation")
jbe/bsw@0 129 mondelefant_errcode_item("23502", "IntegrityConstraintViolation.NotNullViolation")
jbe/bsw@0 130 mondelefant_errcode_item("23503", "IntegrityConstraintViolation.ForeignKeyViolation")
jbe/bsw@0 131 mondelefant_errcode_item("23505", "IntegrityConstraintViolation.UniqueViolation")
jbe/bsw@0 132 mondelefant_errcode_item("23514", "IntegrityConstraintViolation.CheckViolation")
jbe/bsw@0 133 mondelefant_errcode_item("23", "IntegrityConstraintViolation")
jbe/bsw@0 134 mondelefant_errcode_item("24", "InvalidCursorState")
jbe/bsw@0 135 mondelefant_errcode_item("25", "InvalidTransactionState")
jbe/bsw@0 136 mondelefant_errcode_item("26", "InvalidSqlStatementName")
jbe/bsw@0 137 mondelefant_errcode_item("27", "TriggeredDataChangeViolation")
jbe/bsw@0 138 mondelefant_errcode_item("28", "InvalidAuthorizationSpecification")
jbe/bsw@0 139 mondelefant_errcode_item("2B", "DependentPrivilegeDescriptorsStillExist")
jbe/bsw@0 140 mondelefant_errcode_item("2D", "InvalidTransactionTermination")
jbe/bsw@0 141 mondelefant_errcode_item("2F", "SqlRoutineException")
jbe/bsw@0 142 mondelefant_errcode_item("34", "InvalidCursorName")
jbe/bsw@0 143 mondelefant_errcode_item("38", "ExternalRoutineException")
jbe/bsw@0 144 mondelefant_errcode_item("39", "ExternalRoutineInvocationException")
jbe/bsw@0 145 mondelefant_errcode_item("3B", "SavepointException")
jbe/bsw@0 146 mondelefant_errcode_item("3D", "InvalidCatalogName")
jbe/bsw@0 147 mondelefant_errcode_item("3F", "InvalidSchemaName")
jbe/bsw@0 148 mondelefant_errcode_item("40", "TransactionRollback")
jbe/bsw@0 149 mondelefant_errcode_item("42", "SyntaxErrorOrAccessRuleViolation")
jbe/bsw@0 150 mondelefant_errcode_item("44", "WithCheckOptionViolation")
jbe/bsw@0 151 mondelefant_errcode_item("53", "InsufficientResources")
jbe/bsw@0 152 mondelefant_errcode_item("54", "ProgramLimitExceeded")
jbe/bsw@0 153 mondelefant_errcode_item("55", "ObjectNotInPrerequisiteState")
jbe/bsw@0 154 mondelefant_errcode_item("57", "OperatorIntervention")
jbe/bsw@0 155 mondelefant_errcode_item("58", "SystemError")
jbe/bsw@0 156 mondelefant_errcode_item("F0", "ConfigurationFileError")
jbe/bsw@0 157 mondelefant_errcode_item("P0", "PlpgsqlError")
jbe/bsw@0 158 mondelefant_errcode_item("XX", "InternalError")
jbe/bsw@0 159 return "unknown";
jbe/bsw@0 160 }
jbe/bsw@0 161
jbe@23 162 // C-function, checking if a given error code (as defined by this library)
jbe@23 163 // is belonging to a certain class of errors (strings are equal or error
jbe@23 164 // code begins with error class followed by a dot):
jbe/bsw@0 165 static int mondelefant_check_error_class(
jbe/bsw@0 166 const char *errcode, const char *errclass
jbe/bsw@0 167 ) {
jbe/bsw@0 168 size_t i = 0;
jbe/bsw@0 169 while (1) {
jbe/bsw@0 170 if (errclass[i] == 0) {
jbe/bsw@0 171 if (errcode[i] == 0 || errcode[i] == '.') return 1;
jbe/bsw@0 172 else return 0;
jbe/bsw@0 173 }
jbe/bsw@0 174 if (errcode[i] != errclass[i]) return 0;
jbe/bsw@0 175 i++;
jbe/bsw@0 176 }
jbe/bsw@0 177 }
jbe/bsw@0 178
jbe@23 179 // pushing first line of a string on Lua's stack (without trailing CR/LF):
jbe/bsw@0 180 static void mondelefant_push_first_line(lua_State *L, const char *str) {
jbe/bsw@0 181 char *str2;
jbe/bsw@0 182 size_t i = 0;
jbe/bsw@0 183 if (!str) abort(); // should not happen
jbe/bsw@0 184 str2 = strdup(str);
jbe/bsw@0 185 while (1) {
jbe/bsw@0 186 char c = str2[i];
jbe/bsw@0 187 if (c == '\n' || c == '\r' || c == 0) { str2[i] = 0; break; }
jbe/bsw@0 188 i++;
jbe/bsw@0 189 };
jbe/bsw@0 190 lua_pushstring(L, str2);
jbe/bsw@0 191 free(str2);
jbe/bsw@0 192 }
jbe/bsw@0 193
jbe@23 194 // "connect" function of library, which establishes a database connection
jbe@23 195 // and returns a database connection handle:
jbe/bsw@0 196 static int mondelefant_connect(lua_State *L) {
jbe@23 197 luaL_Buffer buf; // Lua string buffer to create 'conninfo' (see below)
jbe@23 198 const char *conninfo; // string for PQconnectdb function
jbe@23 199 PGconn *pgconn; // PGconn object as returned by PQconnectdb function
jbe@23 200 mondelefant_conn_t *conn; // C-structure for userdata
jbe@23 201 // if engine is anything but "postgresql", then raise error:
jbe/bsw@0 202 lua_settop(L, 1);
jbe/bsw@0 203 lua_getfield(L, 1, "engine"); // 2
jbe/bsw@0 204 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 205 return luaL_error(L, "No database engine selected.");
jbe/bsw@0 206 }
jbe/bsw@0 207 lua_pushliteral(L, "postgresql"); // 3
jbe/bsw@0 208 if (!lua_rawequal(L, 2, 3)) {
jbe/bsw@0 209 return luaL_error(L,
jbe/bsw@0 210 "Only database engine 'postgresql' is supported."
jbe/bsw@0 211 );
jbe/bsw@0 212 }
jbe@40 213 // copy conninfo string for PQconnectdb function from argument table to
jbe@40 214 // stack position 2:
jbe/bsw@0 215 lua_settop(L, 1);
jbe@40 216 lua_getfield(L, 1, "conninfo"); // 2
jbe@40 217 // if no conninfo string was found, then assemble one from the named
jbe@40 218 // options except "engine" option:
jbe@40 219 if (!lua_toboolean(L, 2)) {
jbe@40 220 lua_settop(L, 1);
jbe@40 221 lua_pushnil(L); // slot for key at stack position 2
jbe@40 222 lua_pushnil(L); // slot for value at stack position 3
jbe@40 223 luaL_buffinit(L, &buf);
jbe@40 224 {
jbe@40 225 int need_seperator = 0;
jbe@40 226 while (lua_pushvalue(L, 2), lua_next(L, 1)) {
jbe@40 227 lua_replace(L, 3);
jbe@40 228 lua_replace(L, 2);
jbe@40 229 // NOTE: numbers will be converted to strings automatically here,
jbe@40 230 // but perhaps this will change in future versions of lua
jbe@40 231 luaL_argcheck(L,
jbe@40 232 lua_isstring(L, 2) && lua_isstring(L, 3), 1, "non-string contained"
jbe@40 233 );
jbe@40 234 lua_pushvalue(L, 2);
jbe@40 235 lua_pushliteral(L, "engine");
jbe@40 236 if (!lua_rawequal(L, -2, -1)) {
jbe@40 237 const char *value;
jbe@40 238 size_t value_len;
jbe@40 239 size_t value_pos = 0;
jbe@40 240 lua_pop(L, 1);
jbe@40 241 if (need_seperator) luaL_addchar(&buf, ' ');
jbe@40 242 luaL_addvalue(&buf);
jbe@40 243 luaL_addchar(&buf, '=');
jbe@40 244 luaL_addchar(&buf, '\'');
jbe@40 245 value = lua_tolstring(L, 3, &value_len);
jbe@40 246 do {
jbe@40 247 char c;
jbe@40 248 c = value[value_pos++];
jbe@40 249 if (c == '\'') luaL_addchar(&buf, '\\');
jbe@40 250 luaL_addchar(&buf, c);
jbe@40 251 } while (value_pos < value_len);
jbe@40 252 luaL_addchar(&buf, '\'');
jbe@40 253 need_seperator = 1;
jbe@40 254 } else {
jbe@40 255 lua_pop(L, 1);
jbe@40 256 }
jbe/bsw@0 257 }
jbe/bsw@0 258 }
jbe@40 259 luaL_pushresult(&buf);
jbe@40 260 lua_replace(L, 2);
jbe@40 261 lua_settop(L, 2);
jbe/bsw@0 262 }
jbe@40 263 // use conninfo string on stack position 2:
jbe/bsw@0 264 conninfo = lua_tostring(L, 2);
jbe@23 265 // call PQconnectdb function of libpq:
jbe/bsw@0 266 pgconn = PQconnectdb(conninfo);
jbe@23 267 // throw errors, if neccessary:
jbe/bsw@0 268 if (!pgconn) {
jbe/bsw@0 269 return luaL_error(L,
jbe/bsw@0 270 "Error in libpq while creating 'PGconn' structure."
jbe/bsw@0 271 );
jbe/bsw@0 272 }
jbe/bsw@0 273 if (PQstatus(pgconn) != CONNECTION_OK) {
jbe/bsw@0 274 const char *errmsg;
jbe/bsw@0 275 lua_pushnil(L);
jbe/bsw@0 276 errmsg = PQerrorMessage(pgconn);
jbe/bsw@0 277 if (errmsg) {
jbe/bsw@0 278 mondelefant_push_first_line(L, errmsg);
jbe/bsw@0 279 } else {
jbe/bsw@0 280 lua_pushliteral(L,
jbe/bsw@0 281 "Error while connecting to database, but no error message given."
jbe/bsw@0 282 );
jbe/bsw@0 283 }
jbe/bsw@0 284 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe/bsw@0 285 PQfinish(pgconn);
jbe/bsw@0 286 return 3;
jbe/bsw@0 287 }
jbe@23 288 // create userdata:
jbe/bsw@0 289 lua_settop(L, 0);
jbe/bsw@0 290 conn = lua_newuserdata(L, sizeof(*conn)); // 1
jbe@23 291 // set 'pgconn' in C-struct of userdata:
jbe/bsw@0 292 conn->pgconn = pgconn;
jbe@23 293 // set 'server_encoding' in C-struct of userdata:
jbe/bsw@0 294 {
jbe/bsw@0 295 const char *charset;
jbe/bsw@0 296 charset = PQparameterStatus(pgconn, "server_encoding");
jbe/bsw@0 297 if (charset && !strcmp(charset, "UTF8")) {
jbe/bsw@0 298 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_UTF8;
jbe/bsw@0 299 } else {
jbe/bsw@0 300 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_ASCII;
jbe/bsw@0 301 }
jbe/bsw@0 302 }
jbe@23 303 // set meta-table of userdata:
jbe/bsw@0 304 luaL_getmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe/bsw@0 305 lua_setmetatable(L, 1);
jbe@23 306 // create entry in table storing connection specific data and associate
jbe@23 307 // created userdata with it:
jbe/bsw@0 308 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY); // 2
jbe/bsw@0 309 lua_pushvalue(L, 1); // 3
jbe/bsw@0 310 lua_newtable(L); // 4
jbe/bsw@0 311 lua_settable(L, 2);
jbe/bsw@0 312 lua_settop(L, 1);
jbe@23 313 // store key "engine" with value "postgresql" as connection specific data:
jbe/bsw@0 314 lua_pushliteral(L, "postgresql");
jbe/bsw@0 315 lua_setfield(L, 1, "engine");
jbe@23 316 // return userdata:
jbe/bsw@0 317 return 1;
jbe/bsw@0 318 }
jbe/bsw@0 319
jbe@23 320 // returns pointer to libpq handle 'pgconn' of userdata at given index
jbe@23 321 // (or throws error, if database connection has been closed):
jbe/bsw@0 322 static mondelefant_conn_t *mondelefant_get_conn(lua_State *L, int index) {
jbe/bsw@0 323 mondelefant_conn_t *conn;
jbe/bsw@0 324 conn = luaL_checkudata(L, index, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 325 if (!conn->pgconn) {
jbe/bsw@0 326 luaL_error(L, "PostgreSQL connection has been closed.");
jbe/bsw@0 327 return NULL;
jbe/bsw@0 328 }
jbe/bsw@0 329 return conn;
jbe/bsw@0 330 }
jbe/bsw@0 331
jbe@23 332 // meta-method "__index" of database handles (userdata):
jbe/bsw@0 333 static int mondelefant_conn_index(lua_State *L) {
jbe@23 334 // try table for connection specific data:
jbe/bsw@0 335 lua_settop(L, 2);
jbe/bsw@0 336 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY); // 3
jbe/bsw@0 337 lua_pushvalue(L, 1); // 4
jbe/bsw@0 338 lua_gettable(L, 3); // 4
jbe/bsw@0 339 lua_remove(L, 3); // connection specific data-table at stack position 3
jbe/bsw@0 340 lua_pushvalue(L, 2); // 4
jbe/bsw@0 341 lua_gettable(L, 3); // 4
jbe/bsw@0 342 if (!lua_isnil(L, 4)) return 1;
jbe@23 343 // try to use prototype stored in connection specific data:
jbe/bsw@0 344 lua_settop(L, 3);
jbe/bsw@0 345 lua_getfield(L, 3, "prototype"); // 4
jbe/bsw@0 346 if (lua_toboolean(L, 4)) {
jbe/bsw@0 347 lua_pushvalue(L, 2); // 5
jbe/bsw@0 348 lua_gettable(L, 4); // 5
jbe/bsw@0 349 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 350 }
jbe@23 351 // try to use "postgresql_connection_prototype" of library:
jbe/bsw@0 352 lua_settop(L, 2);
jbe/bsw@0 353 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY); // 3
jbe/bsw@0 354 lua_getfield(L, 3, "postgresql_connection_prototype"); // 4
jbe/bsw@0 355 if (lua_toboolean(L, 4)) {
jbe/bsw@0 356 lua_pushvalue(L, 2); // 5
jbe/bsw@0 357 lua_gettable(L, 4); // 5
jbe/bsw@0 358 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 359 }
jbe@23 360 // try to use "connection_prototype" of library:
jbe/bsw@0 361 lua_settop(L, 3);
jbe/bsw@0 362 lua_getfield(L, 3, "connection_prototype"); // 4
jbe/bsw@0 363 if (lua_toboolean(L, 4)) {
jbe/bsw@0 364 lua_pushvalue(L, 2); // 5
jbe/bsw@0 365 lua_gettable(L, 4); // 5
jbe/bsw@0 366 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 367 }
jbe@23 368 // give up and return nothing:
jbe/bsw@0 369 return 0;
jbe/bsw@0 370 }
jbe/bsw@0 371
jbe@23 372 // meta-method "__newindex" of database handles (userdata):
jbe/bsw@0 373 static int mondelefant_conn_newindex(lua_State *L) {
jbe@23 374 // store key-value pair in table for connection specific data:
jbe/bsw@0 375 lua_settop(L, 3);
jbe/bsw@0 376 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY); // 4
jbe/bsw@0 377 lua_pushvalue(L, 1); // 5
jbe/bsw@0 378 lua_gettable(L, 4); // 5
jbe@23 379 lua_remove(L, 4); // connection specific data-table at stack position 4
jbe/bsw@0 380 lua_pushvalue(L, 2);
jbe/bsw@0 381 lua_pushvalue(L, 3);
jbe/bsw@0 382 lua_settable(L, 4);
jbe@23 383 // return nothing:
jbe/bsw@0 384 return 0;
jbe/bsw@0 385 }
jbe/bsw@0 386
jbe@23 387 // meta-method "__gc" of database handles:
jbe/bsw@0 388 static int mondelefant_conn_free(lua_State *L) {
jbe/bsw@0 389 mondelefant_conn_t *conn;
jbe/bsw@0 390 conn = luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 391 if (conn->pgconn) PQfinish(conn->pgconn);
jbe/bsw@0 392 conn->pgconn = NULL;
jbe/bsw@0 393 return 0;
jbe/bsw@0 394 }
jbe/bsw@0 395
jbe@23 396 // method "close" of database handles:
jbe/bsw@0 397 static int mondelefant_conn_close(lua_State *L) {
jbe/bsw@0 398 mondelefant_conn_t *conn;
jbe/bsw@0 399 lua_settop(L, 1);
jbe/bsw@0 400 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 401 PQfinish(conn->pgconn);
jbe/bsw@0 402 conn->pgconn = NULL;
jbe/bsw@0 403 return 0;
jbe/bsw@0 404 }
jbe/bsw@0 405
jbe@23 406 // method "is_okay" of database handles:
jbe/bsw@0 407 static int mondelefant_conn_is_ok(lua_State *L) {
jbe/bsw@0 408 mondelefant_conn_t *conn;
jbe/bsw@0 409 lua_settop(L, 1);
jbe/bsw@0 410 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 411 lua_pushboolean(L, PQstatus(conn->pgconn) == CONNECTION_OK);
jbe/bsw@0 412 return 1;
jbe/bsw@0 413 }
jbe/bsw@0 414
jbe@23 415 // method "get_transaction_status" of database handles:
jbe/bsw@0 416 static int mondelefant_conn_get_transaction_status(lua_State *L) {
jbe/bsw@0 417 mondelefant_conn_t *conn;
jbe/bsw@0 418 lua_settop(L, 1);
jbe/bsw@0 419 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 420 switch (PQtransactionStatus(conn->pgconn)) {
jbe/bsw@0 421 case PQTRANS_IDLE:
jbe/bsw@0 422 lua_pushliteral(L, "idle");
jbe/bsw@0 423 break;
jbe/bsw@0 424 case PQTRANS_ACTIVE:
jbe/bsw@0 425 lua_pushliteral(L, "active");
jbe/bsw@0 426 break;
jbe/bsw@0 427 case PQTRANS_INTRANS:
jbe/bsw@0 428 lua_pushliteral(L, "intrans");
jbe/bsw@0 429 break;
jbe/bsw@0 430 case PQTRANS_INERROR:
jbe/bsw@0 431 lua_pushliteral(L, "inerror");
jbe/bsw@0 432 break;
jbe/bsw@0 433 default:
jbe/bsw@0 434 lua_pushliteral(L, "unknown");
jbe/bsw@0 435 }
jbe/bsw@0 436 return 1;
jbe/bsw@0 437 }
jbe/bsw@0 438
jbe@23 439 // method "create_list" of database handles:
jbe/bsw@0 440 static int mondelefant_conn_create_list(lua_State *L) {
jbe@23 441 // ensure that first argument is a database connection:
jbe/bsw@0 442 lua_settop(L, 2);
jbe/bsw@0 443 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 444 // if no second argument is given, use an empty table:
jbe/bsw@0 445 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 446 lua_newtable(L);
jbe/bsw@0 447 lua_replace(L, 2); // new result at stack position 2
jbe/bsw@0 448 }
jbe@23 449 // set meta-table for database result lists/objects:
jbe/bsw@0 450 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
jbe/bsw@0 451 lua_setmetatable(L, 2);
jbe@23 452 // set "_connection" attribute to self:
jbe/bsw@0 453 lua_pushvalue(L, 1); // 3
jbe/bsw@0 454 lua_setfield(L, 2, "_connection");
jbe@23 455 // set "_type" attribute to string "list":
jbe/bsw@0 456 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 457 lua_setfield(L, 2, "_type");
jbe@23 458 // return created database result list:
jbe/bsw@0 459 return 1;
jbe/bsw@0 460 }
jbe/bsw@0 461
jbe@23 462 // method "create_object" of database handles:
jbe/bsw@0 463 static int mondelefant_conn_create_object(lua_State *L) {
jbe@23 464 // ensure that first argument is a database connection:
jbe/bsw@0 465 lua_settop(L, 2);
jbe/bsw@0 466 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 467 // if no second argument is given, use an empty table:
jbe/bsw@0 468 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 469 lua_newtable(L);
jbe/bsw@0 470 lua_replace(L, 2); // new result at stack position 2
jbe/bsw@0 471 }
jbe@23 472 // set meta-table for database result lists/objects:
jbe/bsw@0 473 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
jbe/bsw@0 474 lua_setmetatable(L, 2);
jbe@23 475 // set "_connection" attribute to self:
jbe/bsw@0 476 lua_pushvalue(L, 1); // 3
jbe/bsw@0 477 lua_setfield(L, 2, "_connection");
jbe@23 478 // set "_type" attribute to string "object":
jbe/bsw@0 479 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 480 lua_setfield(L, 2, "_type"); // "object" or "list"
jbe@23 481 // create empty tables for "_data", "_dirty" and "_ref" attributes:
jbe/bsw@0 482 lua_newtable(L); // 3
jbe/bsw@0 483 lua_setfield(L, 2, "_data");
jbe/bsw@0 484 lua_newtable(L); // 3
jbe/bsw@0 485 lua_setfield(L, 2, "_dirty");
jbe/bsw@0 486 lua_newtable(L); // 3
jbe/bsw@0 487 lua_setfield(L, 2, "_ref"); // nil=no info, false=nil, else table
jbe@23 488 // return created database result object:
jbe/bsw@0 489 return 1;
jbe/bsw@0 490 }
jbe/bsw@0 491
jbe@23 492 // method "quote_string" of database handles:
jbe/bsw@0 493 static int mondelefant_conn_quote_string(lua_State *L) {
jbe/bsw@0 494 mondelefant_conn_t *conn;
jbe/bsw@0 495 const char *input;
jbe/bsw@0 496 size_t input_len;
jbe/bsw@0 497 char *output;
jbe/bsw@0 498 size_t output_len;
jbe@23 499 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 500 lua_settop(L, 2);
jbe/bsw@0 501 conn = mondelefant_get_conn(L, 1);
jbe@23 502 // get second argument, which must be a string:
jbe/bsw@0 503 input = luaL_checklstring(L, 2, &input_len);
jbe@23 504 // throw error, if string is too long:
jbe/bsw@0 505 if (input_len > (SIZE_MAX / sizeof(char) - 3) / 2) {
jbe/bsw@0 506 return luaL_error(L, "String to be escaped is too long.");
jbe/bsw@0 507 }
jbe@23 508 // allocate memory for quoted string:
jbe/bsw@0 509 output = malloc((2 * input_len + 3) * sizeof(char));
jbe/bsw@0 510 if (!output) {
jbe/bsw@0 511 return luaL_error(L, "Could not allocate memory for string quoting.");
jbe/bsw@0 512 }
jbe@23 513 // do escaping by calling PQescapeStringConn and enclosing result with
jbe@23 514 // single quotes:
jbe/bsw@0 515 output[0] = '\'';
jbe/bsw@0 516 output_len = PQescapeStringConn(
jbe/bsw@0 517 conn->pgconn, output + 1, input, input_len, NULL
jbe/bsw@0 518 );
jbe/bsw@0 519 output[output_len + 1] = '\'';
jbe/bsw@0 520 output[output_len + 2] = 0;
jbe@23 521 // create Lua string:
jbe/bsw@0 522 lua_pushlstring(L, output, output_len + 2);
jbe@23 523 // free allocated memory:
jbe/bsw@0 524 free(output);
jbe@23 525 // return Lua string:
jbe/bsw@0 526 return 1;
jbe/bsw@0 527 }
jbe/bsw@0 528
jbe@23 529 // method "quote_binary" of database handles:
jbe/bsw@0 530 static int mondelefant_conn_quote_binary(lua_State *L) {
jbe/bsw@0 531 mondelefant_conn_t *conn;
jbe/bsw@0 532 const char *input;
jbe/bsw@0 533 size_t input_len;
jbe/bsw@0 534 char *output;
jbe/bsw@0 535 size_t output_len;
jbe/bsw@0 536 luaL_Buffer buf;
jbe@23 537 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 538 lua_settop(L, 2);
jbe/bsw@0 539 conn = mondelefant_get_conn(L, 1);
jbe@23 540 // get second argument, which must be a string:
jbe/bsw@0 541 input = luaL_checklstring(L, 2, &input_len);
jbe@23 542 // call PQescapeByteaConn, which allocates memory itself:
jbe/bsw@0 543 output = (char *)PQescapeByteaConn(
jbe/bsw@0 544 conn->pgconn, (const unsigned char *)input, input_len, &output_len
jbe/bsw@0 545 );
jbe@23 546 // if PQescapeByteaConn returned NULL, then throw error:
jbe/bsw@0 547 if (!output) {
jbe/bsw@0 548 return luaL_error(L, "Could not allocate memory for binary quoting.");
jbe/bsw@0 549 }
jbe@23 550 // create Lua string enclosed by single quotes:
jbe/bsw@0 551 luaL_buffinit(L, &buf);
jbe/bsw@0 552 luaL_addchar(&buf, '\'');
jbe/bsw@0 553 luaL_addlstring(&buf, output, output_len - 1);
jbe/bsw@0 554 luaL_addchar(&buf, '\'');
jbe/bsw@0 555 luaL_pushresult(&buf);
jbe@23 556 // free memory allocated by PQescapeByteaConn:
jbe/bsw@0 557 PQfreemem(output);
jbe@23 558 // return Lua string:
jbe/bsw@0 559 return 1;
jbe/bsw@0 560 }
jbe/bsw@0 561
jbe@23 562 // method "assemble_command" of database handles:
jbe/bsw@0 563 static int mondelefant_conn_assemble_command(lua_State *L) {
jbe/bsw@0 564 mondelefant_conn_t *conn;
jbe/bsw@0 565 int paramidx = 2;
jbe/bsw@0 566 const char *template;
jbe/bsw@0 567 size_t template_pos = 0;
jbe/bsw@0 568 luaL_Buffer buf;
jbe@23 569 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 570 lua_settop(L, 2);
jbe/bsw@0 571 conn = mondelefant_get_conn(L, 1);
jbe@23 572 // if second argument is a string, return this string:
jbe/bsw@0 573 if (lua_isstring(L, 2)) {
jbe/bsw@0 574 lua_tostring(L, 2);
jbe/bsw@0 575 return 1;
jbe/bsw@0 576 }
jbe@23 577 // if second argument has __tostring meta-method,
jbe@23 578 // then use this method and return its result:
jbe/bsw@0 579 if (luaL_callmeta(L, 2, "__tostring")) return 1;
jbe@23 580 // otherwise, require that second argument is a table:
jbe/bsw@0 581 luaL_checktype(L, 2, LUA_TTABLE);
jbe@23 582 // get first element of table, which must be a string:
jbe/bsw@0 583 lua_rawgeti(L, 2, 1); // 3
jbe/bsw@0 584 luaL_argcheck(L,
jbe/bsw@0 585 lua_isstring(L, 3),
jbe/bsw@0 586 2,
jbe/bsw@0 587 "First entry of SQL command structure is not a string."
jbe/bsw@0 588 );
jbe/bsw@0 589 template = lua_tostring(L, 3);
jbe@23 590 // get value of "input_converter" attribute of database connection:
jbe/bsw@0 591 lua_pushliteral(L, "input_converter"); // 4
jbe/bsw@0 592 lua_gettable(L, 1); // input_converter at stack position 4
jbe@23 593 // reserve space on Lua stack:
jbe/bsw@0 594 lua_pushnil(L); // free space at stack position 5
jbe/bsw@0 595 lua_pushnil(L); // free space at stack position 6
jbe@23 596 // initialize Lua buffer for result string:
jbe/bsw@0 597 luaL_buffinit(L, &buf);
jbe@23 598 // fill buffer in loop:
jbe/bsw@0 599 while (1) {
jbe@23 600 // variable declaration:
jbe/bsw@0 601 char c;
jbe@23 602 // get next character:
jbe/bsw@0 603 c = template[template_pos++];
jbe@23 604 // break, when character is NULL byte:
jbe/bsw@0 605 if (!c) break;
jbe@23 606 // question-mark and dollar-sign are special characters:
jbe@23 607 if (c == '?' || c == '$') { // special character found
jbe@23 608 // check, if same character follows:
jbe@23 609 if (template[template_pos] == c) { // special character is escaped
jbe@23 610 // consume two characters of input and add one character to buffer:
jbe/bsw@0 611 template_pos++;
jbe/bsw@0 612 luaL_addchar(&buf, c);
jbe@23 613 } else { // special character is not escaped
jbe/bsw@0 614 luaL_Buffer keybuf;
jbe/bsw@0 615 int subcmd;
jbe@23 616 // set 'subcmd' = true, if special character was a dollar-sign,
jbe@23 617 // set 'subcmd' = false, if special character was a question-mark:
jbe/bsw@0 618 subcmd = (c == '$');
jbe@23 619 // read any number of alpha numeric chars or underscores
jbe@23 620 // and store them on Lua stack:
jbe/bsw@0 621 luaL_buffinit(L, &keybuf);
jbe/bsw@0 622 while (1) {
jbe/bsw@0 623 c = template[template_pos];
jbe/bsw@0 624 if (
jbe/bsw@0 625 (c < 'A' || c > 'Z') &&
jbe/bsw@0 626 (c < 'a' || c > 'z') &&
jbe/bsw@0 627 (c < '0' || c > '9') &&
jbe/bsw@0 628 (c != '_')
jbe/bsw@0 629 ) break;
jbe/bsw@0 630 luaL_addchar(&keybuf, c);
jbe/bsw@0 631 template_pos++;
jbe/bsw@0 632 }
jbe/bsw@0 633 luaL_pushresult(&keybuf);
jbe@23 634 // check, if any characters matched:
jbe/bsw@0 635 if (lua_objlen(L, -1)) {
jbe@23 636 // if any alpha numeric chars or underscores were found,
jbe@23 637 // push them on stack as a Lua string and use them to lookup
jbe@23 638 // value from second argument:
jbe/bsw@0 639 lua_pushvalue(L, -1); // save key on stack
jbe@23 640 lua_gettable(L, 2); // fetch value (raw-value)
jbe/bsw@0 641 } else {
jbe@23 642 // otherwise push nil and use numeric lookup based on 'paramidx':
jbe/bsw@0 643 lua_pop(L, 1);
jbe/bsw@0 644 lua_pushnil(L); // put nil on key position
jbe@23 645 lua_rawgeti(L, 2, paramidx++); // fetch value (raw-value)
jbe/bsw@0 646 }
jbe@23 647 // Lua stack contains: ..., <buffer>, key, raw-value
jbe@23 648 // branch according to type of special character ("?" or "$"):
jbe@23 649 if (subcmd) { // dollar-sign
jbe/bsw@0 650 size_t i;
jbe/bsw@0 651 size_t count;
jbe@23 652 // store fetched value (which is supposed to be sub-structure)
jbe@23 653 // on Lua stack position 5 and drop key:
jbe@23 654 lua_replace(L, 5);
jbe@23 655 lua_pop(L, 1);
jbe@23 656 // Lua stack contains: ..., <buffer>
jbe@23 657 // check, if fetched value is really a sub-structure:
jbe/bsw@0 658 luaL_argcheck(L,
jbe/bsw@0 659 !lua_isnil(L, 5),
jbe/bsw@0 660 2,
jbe/bsw@0 661 "SQL sub-structure not found."
jbe/bsw@0 662 );
jbe/bsw@0 663 luaL_argcheck(L,
jbe/bsw@0 664 lua_type(L, 5) == LUA_TTABLE,
jbe/bsw@0 665 2,
jbe/bsw@0 666 "SQL sub-structure must be a table."
jbe/bsw@0 667 );
jbe@23 668 // Lua stack contains: ..., <buffer>
jbe@23 669 // get value of "sep" attribute of sub-structure,
jbe@23 670 // and place it on Lua stack position 6:
jbe/bsw@0 671 lua_getfield(L, 5, "sep");
jbe@23 672 lua_replace(L, 6);
jbe@23 673 // if seperator is nil, then use ", " as default,
jbe@23 674 // if seperator is neither nil nor a string, then throw error:
jbe/bsw@0 675 if (lua_isnil(L, 6)) {
jbe/bsw@0 676 lua_pushstring(L, ", ");
jbe/bsw@0 677 lua_replace(L, 6);
jbe/bsw@0 678 } else {
jbe/bsw@0 679 luaL_argcheck(L,
jbe/bsw@0 680 lua_isstring(L, 6),
jbe/bsw@0 681 2,
jbe/bsw@0 682 "Seperator of SQL sub-structure has to be a string."
jbe/bsw@0 683 );
jbe/bsw@0 684 }
jbe@23 685 // iterate over items of sub-structure:
jbe/bsw@0 686 count = lua_objlen(L, 5);
jbe/bsw@0 687 for (i = 0; i < count; i++) {
jbe@23 688 // add seperator, unless this is the first run:
jbe/bsw@0 689 if (i) {
jbe/bsw@0 690 lua_pushvalue(L, 6);
jbe/bsw@0 691 luaL_addvalue(&buf);
jbe/bsw@0 692 }
jbe@23 693 // recursivly apply assemble function and add results to buffer:
jbe/bsw@0 694 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 695 lua_pushvalue(L, 1);
jbe/bsw@0 696 lua_rawgeti(L, 5, i+1);
jbe/bsw@0 697 lua_call(L, 2, 1);
jbe/bsw@0 698 luaL_addvalue(&buf);
jbe/bsw@0 699 }
jbe@23 700 } else { // question-mark
jbe/bsw@0 701 if (lua_toboolean(L, 4)) {
jbe@23 702 // call input_converter with connection handle, raw-value and
jbe@23 703 // an info-table which contains a "field_name" entry with the
jbe@23 704 // used key:
jbe/bsw@0 705 lua_pushvalue(L, 4);
jbe/bsw@0 706 lua_pushvalue(L, 1);
jbe/bsw@0 707 lua_pushvalue(L, -3);
jbe/bsw@0 708 lua_newtable(L);
jbe/bsw@0 709 lua_pushvalue(L, -6);
jbe/bsw@0 710 lua_setfield(L, -2, "field_name");
jbe/bsw@0 711 lua_call(L, 3, 1);
jbe@23 712 // Lua stack contains: ..., <buffer>, key, raw-value, final-value
jbe@23 713 // remove key and raw-value:
jbe/bsw@0 714 lua_remove(L, -2);
jbe/bsw@0 715 lua_remove(L, -2);
jbe@23 716 // Lua stack contains: ..., <buffer>, final-value
jbe@23 717 // throw error, if final-value is not a string:
jbe/bsw@0 718 if (!lua_isstring(L, -1)) {
jbe/bsw@0 719 return luaL_error(L, "input_converter returned non-string.");
jbe/bsw@0 720 }
jbe/bsw@0 721 } else {
jbe@23 722 // remove key from stack:
jbe/bsw@0 723 lua_remove(L, -2);
jbe@23 724 // Lua stack contains: ..., <buffer>, raw-value
jbe@23 725 // branch according to type of value:
jbe@23 726 if (lua_isnil(L, -1)) { // value is nil
jbe@23 727 // push string "NULL" to stack:
jbe/bsw@0 728 lua_pushliteral(L, "NULL");
jbe@23 729 } else if (lua_type(L, -1) == LUA_TBOOLEAN) { // value is boolean
jbe@23 730 // push strings "TRUE" or "FALSE" to stack:
jbe/bsw@0 731 lua_pushstring(L, lua_toboolean(L, -1) ? "TRUE" : "FALSE");
jbe@23 732 } else if (lua_isstring(L, -1)) { // value is string or number
jbe/bsw@0 733 // NOTE: In this version of lua a number will be converted
jbe@23 734 // push output of "quote_string" method of database
jbe@23 735 // connection to stack:
jbe/bsw@0 736 lua_tostring(L, -1);
jbe/bsw@0 737 lua_pushcfunction(L, mondelefant_conn_quote_string);
jbe/bsw@0 738 lua_pushvalue(L, 1);
jbe/bsw@0 739 lua_pushvalue(L, -3);
jbe/bsw@0 740 lua_call(L, 2, 1);
jbe@23 741 } else { // value is of other type
jbe@23 742 // throw error:
jbe/bsw@0 743 return luaL_error(L,
jbe/bsw@0 744 "Unable to convert SQL value due to unknown type "
jbe/bsw@0 745 "or missing input_converter."
jbe/bsw@0 746 );
jbe/bsw@0 747 }
jbe@23 748 // Lua stack contains: ..., <buffer>, raw-value, final-value
jbe@23 749 // remove raw-value:
jbe/bsw@0 750 lua_remove(L, -2);
jbe@23 751 // Lua stack contains: ..., <buffer>, final-value
jbe/bsw@0 752 }
jbe@23 753 // append final-value to buffer:
jbe/bsw@0 754 luaL_addvalue(&buf);
jbe/bsw@0 755 }
jbe/bsw@0 756 }
jbe@23 757 } else { // character is not special
jbe@23 758 // just copy character:
jbe/bsw@0 759 luaL_addchar(&buf, c);
jbe/bsw@0 760 }
jbe/bsw@0 761 }
jbe@23 762 // return string in buffer:
jbe/bsw@0 763 luaL_pushresult(&buf);
jbe/bsw@0 764 return 1;
jbe/bsw@0 765 }
jbe/bsw@0 766
jbe@23 767 // max number of SQL statements executed by one "query" method call:
jbe/bsw@0 768 #define MONDELEFANT_MAX_COMMAND_COUNT 64
jbe@23 769 // max number of columns in a database result:
jbe/bsw@0 770 #define MONDELEFANT_MAX_COLUMN_COUNT 1024
jbe@23 771 // enum values for 'modes' array in C-function below:
jbe/bsw@0 772 #define MONDELEFANT_QUERY_MODE_LIST 1
jbe/bsw@0 773 #define MONDELEFANT_QUERY_MODE_OBJECT 2
jbe/bsw@0 774 #define MONDELEFANT_QUERY_MODE_OPT_OBJECT 3
jbe/bsw@0 775
jbe@23 776 // method "try_query" of database handles:
jbe/bsw@0 777 static int mondelefant_conn_try_query(lua_State *L) {
jbe/bsw@0 778 mondelefant_conn_t *conn;
jbe/bsw@0 779 int command_count;
jbe/bsw@0 780 int command_idx;
jbe/bsw@0 781 int modes[MONDELEFANT_MAX_COMMAND_COUNT];
jbe/bsw@0 782 luaL_Buffer buf;
jbe/bsw@0 783 int sent_success;
jbe/bsw@0 784 PGresult *res;
jbe/bsw@0 785 int rows, cols, row, col;
jbe@23 786 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 787 conn = mondelefant_get_conn(L, 1);
jbe@23 788 // calculate number of commands (2 arguments for one command):
jbe/bsw@0 789 command_count = lua_gettop(L) / 2;
jbe@23 790 // push nil on stack, which is needed, if last mode was ommitted:
jbe@23 791 lua_pushnil(L);
jbe@23 792 // throw error, if number of commands is too high:
jbe/bsw@0 793 if (command_count > MONDELEFANT_MAX_COMMAND_COUNT) {
jbe/bsw@0 794 return luaL_error(L, "Exceeded maximum command count in one query.");
jbe/bsw@0 795 }
jbe@23 796 // create SQL string, store query modes and push SQL string on stack:
jbe/bsw@0 797 luaL_buffinit(L, &buf);
jbe/bsw@0 798 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 799 int mode;
jbe/bsw@0 800 int mode_idx; // stack index of mode string
jbe/bsw@0 801 if (command_idx) luaL_addchar(&buf, ' ');
jbe/bsw@0 802 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 803 lua_pushvalue(L, 1);
jbe/bsw@0 804 lua_pushvalue(L, 2 + 2 * command_idx);
jbe/bsw@0 805 lua_call(L, 2, 1);
jbe/bsw@0 806 luaL_addvalue(&buf);
jbe/bsw@0 807 luaL_addchar(&buf, ';');
jbe/bsw@0 808 mode_idx = 3 + 2 * command_idx;
jbe/bsw@0 809 if (lua_isnil(L, mode_idx)) {
jbe/bsw@0 810 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 811 } else {
jbe/bsw@0 812 const char *modestr;
jbe/bsw@0 813 modestr = luaL_checkstring(L, mode_idx);
jbe/bsw@0 814 if (!strcmp(modestr, "list")) {
jbe/bsw@0 815 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 816 } else if (!strcmp(modestr, "object")) {
jbe/bsw@0 817 mode = MONDELEFANT_QUERY_MODE_OBJECT;
jbe/bsw@0 818 } else if (!strcmp(modestr, "opt_object")) {
jbe/bsw@0 819 mode = MONDELEFANT_QUERY_MODE_OPT_OBJECT;
jbe/bsw@0 820 } else {
jbe/bsw@0 821 return luaL_error(L, "Unknown query mode specified.");
jbe/bsw@0 822 }
jbe/bsw@0 823 }
jbe/bsw@0 824 modes[command_idx] = mode;
jbe/bsw@0 825 }
jbe/bsw@0 826 luaL_pushresult(&buf); // stack position unknown
jbe/bsw@0 827 lua_replace(L, 2); // SQL command string to stack position 2
jbe@23 828 // call sql_tracer, if set:
jbe/bsw@0 829 lua_settop(L, 2);
jbe/bsw@0 830 lua_getfield(L, 1, "sql_tracer"); // tracer at stack position 3
jbe/bsw@0 831 if (lua_toboolean(L, 3)) {
jbe/bsw@0 832 lua_pushvalue(L, 1); // 4
jbe/bsw@0 833 lua_pushvalue(L, 2); // 5
jbe/bsw@0 834 lua_call(L, 2, 1); // trace callback at stack position 3
jbe/bsw@0 835 }
jbe@23 836 // NOTE: If no tracer was found, then nil or false is stored at stack
jbe@23 837 // position 3.
jbe@23 838 // call PQsendQuery function and store result in 'sent_success' variable:
jbe/bsw@0 839 sent_success = PQsendQuery(conn->pgconn, lua_tostring(L, 2));
jbe@23 840 // create preliminary result table:
jbe/bsw@0 841 lua_newtable(L); // results in table at stack position 4
jbe@23 842 // iterate over results using function PQgetResult to fill result table:
jbe/bsw@0 843 for (command_idx = 0; ; command_idx++) {
jbe/bsw@0 844 int mode;
jbe/bsw@0 845 char binary[MONDELEFANT_MAX_COLUMN_COUNT];
jbe/bsw@0 846 ExecStatusType pgstatus;
jbe@23 847 // fetch mode which was given for the command:
jbe/bsw@0 848 mode = modes[command_idx];
jbe@23 849 // if PQsendQuery call was successful, then fetch result data:
jbe/bsw@0 850 if (sent_success) {
jbe@23 851 // NOTE: PQgetResult called one extra time. Break only, if all
jbe@23 852 // queries have been processed and PQgetResult returned NULL.
jbe/bsw@0 853 res = PQgetResult(conn->pgconn);
jbe/bsw@0 854 if (command_idx >= command_count && !res) break;
jbe/bsw@0 855 if (res) {
jbe/bsw@0 856 pgstatus = PQresultStatus(res);
jbe/bsw@0 857 rows = PQntuples(res);
jbe/bsw@0 858 cols = PQnfields(res);
jbe/bsw@0 859 }
jbe/bsw@0 860 }
jbe@23 861 // handle errors:
jbe/bsw@0 862 if (
jbe/bsw@0 863 !sent_success || command_idx >= command_count || !res ||
jbe/bsw@0 864 (pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK) ||
jbe/bsw@0 865 (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) ||
jbe/bsw@0 866 (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST)
jbe/bsw@0 867 ) {
jbe/bsw@0 868 const char *command;
jbe/bsw@0 869 command = lua_tostring(L, 2);
jbe/bsw@0 870 lua_newtable(L); // 5
jbe/bsw@0 871 lua_getfield(L,
jbe/bsw@0 872 LUA_REGISTRYINDEX,
jbe/bsw@0 873 MONDELEFANT_ERROROBJECT_MT_REGKEY
jbe/bsw@0 874 );
jbe/bsw@0 875 lua_setmetatable(L, 5);
jbe/bsw@0 876 lua_pushvalue(L, 1);
jbe/bsw@0 877 lua_setfield(L, 5, "connection");
jbe/bsw@0 878 lua_pushinteger(L, command_idx + 1);
jbe/bsw@0 879 lua_setfield(L, 5, "command_number");
jbe/bsw@0 880 lua_pushvalue(L, 2);
jbe/bsw@0 881 lua_setfield(L, 5, "sql_command");
jbe/bsw@0 882 if (!res) {
jbe/bsw@0 883 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_LOW);
jbe/bsw@0 884 lua_setfield(L, 5, "code");
jbe/bsw@0 885 lua_pushliteral(L, "Received too few database result sets.");
jbe/bsw@0 886 lua_setfield(L, 5, "message");
jbe/bsw@0 887 } else if (command_idx >= command_count) {
jbe/bsw@0 888 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH);
jbe/bsw@0 889 lua_setfield(L, 5, "code");
jbe/bsw@0 890 lua_pushliteral(L, "Received too many database result sets.");
jbe/bsw@0 891 lua_setfield(L, 5, "message");
jbe/bsw@0 892 } else if (
jbe/bsw@0 893 pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK
jbe/bsw@0 894 ) {
jbe/bsw@0 895 const char *sqlstate;
jbe/bsw@0 896 const char *errmsg;
jbe/bsw@0 897 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SEVERITY));
jbe/bsw@0 898 lua_setfield(L, 5, "pg_severity");
jbe/bsw@0 899 sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
jbe/bsw@0 900 if (sqlstate) {
jbe/bsw@0 901 lua_pushstring(L, sqlstate);
jbe/bsw@0 902 lua_setfield(L, 5, "pg_sqlstate");
jbe/bsw@0 903 lua_pushstring(L, mondelefant_translate_errcode(sqlstate));
jbe/bsw@0 904 lua_setfield(L, 5, "code");
jbe/bsw@0 905 } else {
jbe/bsw@0 906 lua_pushliteral(L, MONDELEFANT_ERRCODE_UNKNOWN);
jbe/bsw@0 907 lua_setfield(L, 5, "code");
jbe/bsw@0 908 }
jbe/bsw@0 909 errmsg = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
jbe/bsw@0 910 if (errmsg) {
jbe/bsw@0 911 mondelefant_push_first_line(L, errmsg);
jbe/bsw@0 912 lua_setfield(L, 5, "message");
jbe/bsw@0 913 lua_pushstring(L, errmsg);
jbe/bsw@0 914 lua_setfield(L, 5, "pg_message_primary");
jbe/bsw@0 915 } else {
jbe/bsw@0 916 lua_pushliteral(L,
jbe/bsw@0 917 "Error while fetching result, but no error message given."
jbe/bsw@0 918 );
jbe/bsw@0 919 lua_setfield(L, 5, "message");
jbe/bsw@0 920 }
jbe/bsw@0 921 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL));
jbe/bsw@0 922 lua_setfield(L, 5, "pg_message_detail");
jbe/bsw@0 923 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_HINT));
jbe/bsw@0 924 lua_setfield(L, 5, "pg_message_hint");
jbe/bsw@0 925 // NOTE: "position" and "pg_internal_position" are recalculated to
jbe/bsw@0 926 // byte offsets, as Lua 5.1 is not Unicode aware.
jbe/bsw@0 927 {
jbe/bsw@0 928 char *tmp;
jbe/bsw@0 929 tmp = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
jbe/bsw@0 930 if (tmp) {
jbe/bsw@0 931 int pos;
jbe/bsw@0 932 pos = atoi(tmp) - 1;
jbe/bsw@0 933 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe/bsw@0 934 pos = utf8_position_to_byte(command, pos);
jbe/bsw@0 935 }
jbe/bsw@0 936 lua_pushinteger(L, pos + 1);
jbe/bsw@0 937 lua_setfield(L, 5, "position");
jbe/bsw@0 938 }
jbe/bsw@0 939 }
jbe/bsw@0 940 {
jbe/bsw@0 941 const char *internal_query;
jbe/bsw@0 942 internal_query = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
jbe/bsw@0 943 lua_pushstring(L, internal_query);
jbe/bsw@0 944 lua_setfield(L, 5, "pg_internal_query");
jbe/bsw@0 945 char *tmp;
jbe/bsw@0 946 tmp = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
jbe/bsw@0 947 if (tmp) {
jbe/bsw@0 948 int pos;
jbe/bsw@0 949 pos = atoi(tmp) - 1;
jbe/bsw@0 950 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe/bsw@0 951 pos = utf8_position_to_byte(internal_query, pos);
jbe/bsw@0 952 }
jbe/bsw@0 953 lua_pushinteger(L, pos + 1);
jbe/bsw@0 954 lua_setfield(L, 5, "pg_internal_position");
jbe/bsw@0 955 }
jbe/bsw@0 956 }
jbe/bsw@0 957 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_CONTEXT));
jbe/bsw@0 958 lua_setfield(L, 5, "pg_context");
jbe/bsw@0 959 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FILE));
jbe/bsw@0 960 lua_setfield(L, 5, "pg_source_file");
jbe/bsw@0 961 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_LINE));
jbe/bsw@0 962 lua_setfield(L, 5, "pg_source_line");
jbe/bsw@0 963 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION));
jbe/bsw@0 964 lua_setfield(L, 5, "pg_source_function");
jbe/bsw@0 965 } else if (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) {
jbe/bsw@0 966 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_NO_ROWS);
jbe/bsw@0 967 lua_setfield(L, 5, "code");
jbe/bsw@0 968 lua_pushliteral(L, "Expected one row, but got empty set.");
jbe/bsw@0 969 lua_setfield(L, 5, "message");
jbe/bsw@0 970 } else if (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 971 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS);
jbe/bsw@0 972 lua_setfield(L, 5, "code");
jbe/bsw@0 973 lua_pushliteral(L, "Got more than one result row.");
jbe/bsw@0 974 lua_setfield(L, 5, "message");
jbe/bsw@0 975 } else {
jbe/bsw@0 976 // should not happen
jbe/bsw@0 977 abort();
jbe/bsw@0 978 }
jbe/bsw@0 979 if (res) {
jbe/bsw@0 980 PQclear(res);
jbe/bsw@0 981 while ((res = PQgetResult(conn->pgconn))) PQclear(res);
jbe/bsw@0 982 }
jbe/bsw@0 983 if (lua_toboolean(L, 3)) {
jbe/bsw@0 984 lua_pushvalue(L, 3);
jbe/bsw@0 985 lua_pushvalue(L, 5);
jbe/bsw@0 986 lua_call(L, 1, 0);
jbe/bsw@0 987 }
jbe/bsw@0 988 return 1;
jbe/bsw@0 989 }
jbe@23 990 // call "create_list" or "create_object" method of database handle,
jbe@23 991 // result will be at stack position 5:
jbe/bsw@0 992 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 993 lua_pushcfunction(L, mondelefant_conn_create_list); // 5
jbe/bsw@0 994 lua_pushvalue(L, 1); // 6
jbe/bsw@0 995 lua_call(L, 1, 1); // 5
jbe/bsw@0 996 } else {
jbe/bsw@0 997 lua_pushcfunction(L, mondelefant_conn_create_object); // 5
jbe/bsw@0 998 lua_pushvalue(L, 1); // 6
jbe/bsw@0 999 lua_call(L, 1, 1); // 5
jbe/bsw@0 1000 }
jbe@23 1001 // set "_column_info":
jbe@23 1002 lua_newtable(L); // 6
jbe/bsw@0 1003 for (col = 0; col < cols; col++) {
jbe/bsw@0 1004 lua_newtable(L); // 7
jbe/bsw@0 1005 lua_pushstring(L, PQfname(res, col));
jbe/bsw@0 1006 lua_setfield(L, 7, "field_name");
jbe/bsw@0 1007 {
jbe/bsw@0 1008 Oid tmp;
jbe/bsw@0 1009 tmp = PQftable(res, col);
jbe/bsw@0 1010 if (tmp == InvalidOid) lua_pushnil(L);
jbe/bsw@0 1011 else lua_pushinteger(L, tmp);
jbe/bsw@0 1012 lua_setfield(L, 7, "table_oid");
jbe/bsw@0 1013 }
jbe/bsw@0 1014 {
jbe/bsw@0 1015 int tmp;
jbe/bsw@0 1016 tmp = PQftablecol(res, col);
jbe/bsw@0 1017 if (tmp == 0) lua_pushnil(L);
jbe/bsw@0 1018 else lua_pushinteger(L, tmp);
jbe/bsw@0 1019 lua_setfield(L, 7, "table_column_number");
jbe/bsw@0 1020 }
jbe/bsw@0 1021 {
jbe/bsw@0 1022 Oid tmp;
jbe/bsw@0 1023 tmp = PQftype(res, col);
jbe/bsw@0 1024 binary[col] = (tmp == MONDELEFANT_POSTGRESQL_BINARY_OID);
jbe/bsw@0 1025 lua_pushinteger(L, tmp);
jbe/bsw@0 1026 lua_setfield(L, 7, "type_oid");
jbe/bsw@0 1027 lua_pushstring(L, mondelefant_oid_to_typestr(tmp));
jbe/bsw@0 1028 lua_setfield(L, 7, "type");
jbe/bsw@0 1029 }
jbe/bsw@0 1030 {
jbe/bsw@0 1031 int tmp;
jbe/bsw@0 1032 tmp = PQfmod(res, col);
jbe/bsw@0 1033 if (tmp == -1) lua_pushnil(L);
jbe/bsw@0 1034 else lua_pushinteger(L, tmp);
jbe/bsw@0 1035 lua_setfield(L, 7, "type_modifier");
jbe/bsw@0 1036 }
jbe/bsw@0 1037 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1038 }
jbe@23 1039 lua_setfield(L, 5, "_column_info");
jbe@23 1040 // set "_rows_affected":
jbe/bsw@0 1041 {
jbe/bsw@0 1042 char *tmp;
jbe/bsw@0 1043 tmp = PQcmdTuples(res);
jbe/bsw@0 1044 if (tmp[0]) {
jbe/bsw@0 1045 lua_pushinteger(L, atoi(tmp));
jbe/bsw@0 1046 lua_setfield(L, 5, "_rows_affected");
jbe/bsw@0 1047 }
jbe/bsw@0 1048 }
jbe@23 1049 // set "_oid":
jbe/bsw@0 1050 {
jbe/bsw@0 1051 Oid tmp;
jbe/bsw@0 1052 tmp = PQoidValue(res);
jbe/bsw@0 1053 if (tmp != InvalidOid) {
jbe/bsw@0 1054 lua_pushinteger(L, tmp);
jbe/bsw@0 1055 lua_setfield(L, 5, "_oid");
jbe/bsw@0 1056 }
jbe/bsw@0 1057 }
jbe@23 1058 // copy data as strings or nil, while performing binary unescaping
jbe@23 1059 // automatically:
jbe/bsw@0 1060 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1061 for (row = 0; row < rows; row++) {
jbe/bsw@0 1062 lua_pushcfunction(L, mondelefant_conn_create_object); // 6
jbe/bsw@0 1063 lua_pushvalue(L, 1); // 7
jbe/bsw@0 1064 lua_call(L, 1, 1); // 6
jbe/bsw@0 1065 for (col = 0; col < cols; col++) {
jbe/bsw@0 1066 if (PQgetisnull(res, row, col)) {
jbe/bsw@0 1067 lua_pushnil(L);
jbe/bsw@0 1068 } else if (binary[col]) {
jbe/bsw@0 1069 size_t binlen;
jbe/bsw@0 1070 char *binval;
jbe/bsw@0 1071 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1072 (unsigned char *)PQgetvalue(res, row, col), &binlen
jbe/bsw@0 1073 );
jbe/bsw@0 1074 if (!binval) {
jbe/bsw@0 1075 return luaL_error(L,
jbe/bsw@0 1076 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1077 );
jbe/bsw@0 1078 }
jbe/bsw@0 1079 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1080 PQfreemem(binval);
jbe/bsw@0 1081 } else {
jbe/bsw@0 1082 lua_pushstring(L, PQgetvalue(res, row, col));
jbe/bsw@0 1083 }
jbe/bsw@0 1084 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1085 }
jbe/bsw@0 1086 lua_rawseti(L, 5, row+1);
jbe/bsw@0 1087 }
jbe/bsw@0 1088 } else if (rows == 1) {
jbe/bsw@0 1089 for (col = 0; col < cols; col++) {
jbe/bsw@0 1090 if (PQgetisnull(res, 0, col)) {
jbe/bsw@0 1091 lua_pushnil(L);
jbe/bsw@0 1092 } else if (binary[col]) {
jbe/bsw@0 1093 size_t binlen;
jbe/bsw@0 1094 char *binval;
jbe/bsw@0 1095 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1096 (unsigned char *)PQgetvalue(res, 0, col), &binlen
jbe/bsw@0 1097 );
jbe/bsw@0 1098 if (!binval) {
jbe/bsw@0 1099 return luaL_error(L,
jbe/bsw@0 1100 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1101 );
jbe/bsw@0 1102 }
jbe/bsw@0 1103 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1104 PQfreemem(binval);
jbe/bsw@0 1105 } else {
jbe/bsw@0 1106 lua_pushstring(L, PQgetvalue(res, 0, col));
jbe/bsw@0 1107 }
jbe/bsw@0 1108 lua_rawseti(L, 5, col+1);
jbe/bsw@0 1109 }
jbe/bsw@0 1110 } else {
jbe/bsw@0 1111 // no row in optrow mode
jbe/bsw@0 1112 lua_pop(L, 1);
jbe/bsw@0 1113 lua_pushnil(L);
jbe/bsw@0 1114 }
jbe@23 1115 // save result in result list:
jbe/bsw@0 1116 lua_rawseti(L, 4, command_idx+1);
jbe@23 1117 // extra assertion:
jbe/bsw@0 1118 if (lua_gettop(L) != 4) abort(); // should not happen
jbe@23 1119 // free memory acquired by libpq:
jbe/bsw@0 1120 PQclear(res);
jbe/bsw@0 1121 }
jbe/bsw@0 1122 // trace callback at stack position 3
jbe/bsw@0 1123 // result at stack position 4 (top of stack)
jbe@23 1124 // if a trace callback is existent, then call:
jbe/bsw@0 1125 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1126 lua_pushvalue(L, 3);
jbe/bsw@0 1127 lua_call(L, 0, 0);
jbe/bsw@0 1128 }
jbe@23 1129 // put result at stack position 3:
jbe@23 1130 lua_replace(L, 3);
jbe@23 1131 // get output converter to stack position 4:
jbe@23 1132 lua_getfield(L, 1, "output_converter");
jbe@23 1133 // apply output converters and fill "_data" table according to column names:
jbe/bsw@0 1134 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1135 int mode;
jbe/bsw@0 1136 mode = modes[command_idx];
jbe/bsw@0 1137 lua_rawgeti(L, 3, command_idx+1); // raw result at stack position 5
jbe/bsw@0 1138 if (lua_toboolean(L, 5)) {
jbe/bsw@0 1139 lua_getfield(L, 5, "_column_info"); // column_info list at position 6
jbe/bsw@0 1140 cols = lua_objlen(L, 6);
jbe/bsw@0 1141 if (mode == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1142 rows = lua_objlen(L, 5);
jbe/bsw@0 1143 for (row = 0; row < rows; row++) {
jbe/bsw@0 1144 lua_rawgeti(L, 5, row+1); // row at stack position 7
jbe/bsw@0 1145 lua_getfield(L, 7, "_data"); // _data table at stack position 8
jbe/bsw@0 1146 for (col = 0; col < cols; col++) {
jbe/bsw@0 1147 lua_rawgeti(L, 6, col+1); // this column info at position 9
jbe/bsw@0 1148 lua_getfield(L, 9, "field_name"); // 10
jbe/bsw@0 1149 if (lua_toboolean(L, 4)) {
jbe/bsw@0 1150 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0 1151 lua_pushvalue(L, 1); // connection
jbe/bsw@0 1152 lua_rawgeti(L, 7, col+1); // raw-value
jbe/bsw@0 1153 lua_pushvalue(L, 9); // this column info
jbe/bsw@0 1154 lua_call(L, 3, 1); // converted value at position 11
jbe/bsw@0 1155 } else {
jbe/bsw@0 1156 lua_rawgeti(L, 7, col+1); // raw-value at position 11
jbe/bsw@0 1157 }
jbe/bsw@0 1158 lua_pushvalue(L, 11); // 12
jbe/bsw@0 1159 lua_rawseti(L, 7, col+1);
jbe/bsw@0 1160 lua_rawset(L, 8);
jbe/bsw@0 1161 lua_settop(L, 8);
jbe/bsw@0 1162 }
jbe/bsw@0 1163 lua_settop(L, 6);
jbe/bsw@0 1164 }
jbe/bsw@0 1165 } else {
jbe/bsw@0 1166 lua_getfield(L, 5, "_data"); // _data table at stack position 7
jbe/bsw@0 1167 for (col = 0; col < cols; col++) {
jbe/bsw@0 1168 lua_rawgeti(L, 6, col+1); // this column info at position 8
jbe/bsw@0 1169 lua_getfield(L, 8, "field_name"); // 9
jbe/bsw@0 1170 if (lua_toboolean(L, 4)) {
jbe/bsw@0 1171 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0 1172 lua_pushvalue(L, 1); // connection
jbe/bsw@0 1173 lua_rawgeti(L, 5, col+1); // raw-value
jbe/bsw@0 1174 lua_pushvalue(L, 8); // this column info
jbe/bsw@0 1175 lua_call(L, 3, 1); // converted value at position 10
jbe/bsw@0 1176 } else {
jbe/bsw@0 1177 lua_rawgeti(L, 5, col+1); // raw-value at position 10
jbe/bsw@0 1178 }
jbe/bsw@0 1179 lua_pushvalue(L, 10); // 11
jbe/bsw@0 1180 lua_rawseti(L, 5, col+1);
jbe/bsw@0 1181 lua_rawset(L, 7);
jbe/bsw@0 1182 lua_settop(L, 7);
jbe/bsw@0 1183 }
jbe/bsw@0 1184 }
jbe/bsw@0 1185 }
jbe/bsw@0 1186 lua_settop(L, 4);
jbe/bsw@0 1187 }
jbe@23 1188 // return nil as first result value, followed by result lists/objects:
jbe/bsw@0 1189 lua_settop(L, 3);
jbe/bsw@0 1190 lua_pushnil(L);
jbe/bsw@0 1191 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1192 lua_rawgeti(L, 3, command_idx+1);
jbe/bsw@0 1193 }
jbe/bsw@0 1194 return command_count+1;
jbe/bsw@0 1195 }
jbe/bsw@0 1196
jbe@23 1197 // method "escalate" of error objects:
jbe/bsw@0 1198 static int mondelefant_errorobject_escalate(lua_State *L) {
jbe@23 1199 // check, if we may throw an error object instead of an error string:
jbe/bsw@0 1200 lua_settop(L, 1);
jbe/bsw@0 1201 lua_getfield(L, 1, "connection"); // 2
jbe/bsw@0 1202 lua_getfield(L, 2, "error_objects"); // 3
jbe/bsw@0 1203 if (lua_toboolean(L, 3)) {
jbe@23 1204 // throw error object:
jbe/bsw@0 1205 lua_settop(L, 1);
jbe/bsw@0 1206 return lua_error(L);
jbe/bsw@0 1207 } else {
jbe@23 1208 // throw error string:
jbe/bsw@0 1209 lua_getfield(L, 1, "message"); // 4
jbe/bsw@0 1210 if (lua_isnil(L, 4)) {
jbe/bsw@0 1211 return luaL_error(L, "No error message given for escalation.");
jbe/bsw@0 1212 }
jbe/bsw@0 1213 return lua_error(L);
jbe/bsw@0 1214 }
jbe/bsw@0 1215 }
jbe/bsw@0 1216
jbe@23 1217 // method "is_kind_of" of error objects:
jbe/bsw@0 1218 static int mondelefant_errorobject_is_kind_of(lua_State *L) {
jbe/bsw@0 1219 lua_settop(L, 2);
jbe/bsw@0 1220 lua_getfield(L, 1, "code"); // 3
jbe/bsw@0 1221 if (lua_isstring(L, 3)) {
jbe/bsw@0 1222 lua_pushboolean(L,
jbe/bsw@0 1223 mondelefant_check_error_class(
jbe/bsw@0 1224 lua_tostring(L, 3), luaL_checkstring(L, 2)
jbe/bsw@0 1225 )
jbe/bsw@0 1226 );
jbe/bsw@0 1227 } else {
jbe/bsw@0 1228 // only happens for errors where code is not set
jbe/bsw@0 1229 lua_pushboolean(L, 0);
jbe/bsw@0 1230 }
jbe/bsw@0 1231 return 1;
jbe/bsw@0 1232 }
jbe/bsw@0 1233
jbe@23 1234 // method "query" of database handles:
jbe/bsw@0 1235 static int mondelefant_conn_query(lua_State *L) {
jbe/bsw@0 1236 int argc;
jbe@23 1237 // count number of arguments:
jbe/bsw@0 1238 argc = lua_gettop(L);
jbe@23 1239 // insert "try_query" function/method at stack position 1:
jbe/bsw@0 1240 lua_pushcfunction(L, mondelefant_conn_try_query);
jbe@23 1241 lua_insert(L, 1);
jbe@23 1242 // call "try_query" method:
jbe@23 1243 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@23 1244 // check, if error occurred:
jbe@23 1245 if (lua_toboolean(L, 1)) {
jbe@23 1246 // invoke escalate method of error object:
jbe/bsw@0 1247 lua_pushcfunction(L, mondelefant_errorobject_escalate);
jbe@23 1248 lua_pushvalue(L, 1);
jbe/bsw@0 1249 lua_call(L, 1, 0); // will raise an error
jbe/bsw@0 1250 return 0; // should not be executed
jbe/bsw@0 1251 } else {
jbe@23 1252 // return everything but nil error object:
jbe@23 1253 return lua_gettop(L) - 1;
jbe/bsw@0 1254 }
jbe/bsw@0 1255 }
jbe/bsw@0 1256
jbe@23 1257 // library function "set_class":
jbe/bsw@0 1258 static int mondelefant_set_class(lua_State *L) {
jbe@23 1259 // ensure that first argument is a database result list/object:
jbe/bsw@0 1260 lua_settop(L, 2);
jbe/bsw@0 1261 lua_getmetatable(L, 1); // 3
jbe/bsw@0 1262 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 4
jbe/bsw@0 1263 luaL_argcheck(L, lua_equal(L, 3, 4), 1, "not a database result");
jbe@23 1264 // ensure that second argument is a database class (model):
jbe/bsw@0 1265 lua_settop(L, 2);
jbe/bsw@0 1266 lua_getmetatable(L, 2); // 3
jbe/bsw@0 1267 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 4
jbe/bsw@0 1268 luaL_argcheck(L, lua_equal(L, 3, 4), 2, "not a database class");
jbe@23 1269 // set attribute "_class" of result list/object to given class:
jbe/bsw@0 1270 lua_settop(L, 2);
jbe/bsw@0 1271 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1272 lua_setfield(L, 1, "_class");
jbe@23 1273 // test, if database result is a list (and not a single object):
jbe/bsw@0 1274 lua_getfield(L, 1, "_type"); // 3
jbe/bsw@0 1275 lua_pushliteral(L, "list"); // 4
jbe/bsw@0 1276 if (lua_rawequal(L, 3, 4)) {
jbe/bsw@0 1277 int i;
jbe@23 1278 // set attribute "_class" of all elements to given class:
jbe/bsw@0 1279 for (i=0; i < lua_objlen(L, 1); i++) {
jbe/bsw@0 1280 lua_settop(L, 2);
jbe/bsw@0 1281 lua_rawgeti(L, 1, i+1); // 3
jbe/bsw@0 1282 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1283 lua_setfield(L, 3, "_class");
jbe/bsw@0 1284 }
jbe/bsw@0 1285 }
jbe@23 1286 // return first argument:
jbe/bsw@0 1287 lua_settop(L, 1);
jbe/bsw@0 1288 return 1;
jbe/bsw@0 1289 }
jbe/bsw@0 1290
jbe@23 1291 // library function "new_class":
jbe/bsw@0 1292 static int mondelefant_new_class(lua_State *L) {
jbe@23 1293 // use first argument as template or create new table:
jbe/bsw@0 1294 lua_settop(L, 1);
jbe/bsw@0 1295 if (!lua_toboolean(L, 1)) {
jbe/bsw@0 1296 lua_settop(L, 0);
jbe/bsw@0 1297 lua_newtable(L); // 1
jbe/bsw@0 1298 }
jbe@23 1299 // set meta-table for database classes (models):
jbe/bsw@0 1300 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe/bsw@0 1301 lua_setmetatable(L, 1);
jbe@23 1302 // check, if "prototype" attribute is not set:
jbe/bsw@0 1303 lua_pushliteral(L, "prototype"); // 2
jbe/bsw@0 1304 lua_rawget(L, 1); // 2
jbe/bsw@0 1305 if (!lua_toboolean(L, 2)) {
jbe@23 1306 // set "prototype" attribute to default prototype:
jbe/bsw@0 1307 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1308 lua_getfield(L,
jbe/bsw@0 1309 LUA_REGISTRYINDEX,
jbe/bsw@0 1310 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1311 ); // 4
jbe/bsw@0 1312 lua_rawset(L, 1);
jbe/bsw@0 1313 }
jbe@23 1314 // set "object" attribute to empty table, unless it is already set:
jbe/bsw@0 1315 lua_settop(L, 1);
jbe/bsw@0 1316 lua_pushliteral(L, "object"); // 2
jbe/bsw@0 1317 lua_rawget(L, 1); // 2
jbe/bsw@0 1318 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1319 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 1320 lua_newtable(L); // 4
jbe/bsw@0 1321 lua_rawset(L, 1);
jbe/bsw@0 1322 }
jbe@23 1323 // set "object_get" attribute to empty table, unless it is already set:
jbe/bsw@0 1324 lua_settop(L, 1);
jbe/bsw@0 1325 lua_pushliteral(L, "object_get"); // 2
jbe/bsw@0 1326 lua_rawget(L, 1); // 2
jbe/bsw@0 1327 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1328 lua_pushliteral(L, "object_get"); // 3
jbe/bsw@0 1329 lua_newtable(L); // 4
jbe/bsw@0 1330 lua_rawset(L, 1);
jbe/bsw@0 1331 }
jbe@23 1332 // set "object_set" attribute to empty table, unless it is already set:
jbe/bsw@0 1333 lua_settop(L, 1);
jbe/bsw@0 1334 lua_pushliteral(L, "object_set"); // 2
jbe/bsw@0 1335 lua_rawget(L, 1); // 2
jbe/bsw@0 1336 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1337 lua_pushliteral(L, "object_set"); // 3
jbe/bsw@0 1338 lua_newtable(L); // 4
jbe/bsw@0 1339 lua_rawset(L, 1);
jbe/bsw@0 1340 }
jbe@23 1341 // set "list" attribute to empty table, unless it is already set:
jbe/bsw@0 1342 lua_settop(L, 1);
jbe/bsw@0 1343 lua_pushliteral(L, "list"); // 2
jbe/bsw@0 1344 lua_rawget(L, 1); // 2
jbe/bsw@0 1345 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1346 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 1347 lua_newtable(L); // 4
jbe/bsw@0 1348 lua_rawset(L, 1);
jbe/bsw@0 1349 }
jbe@23 1350 // set "references" attribute to empty table, unless it is already set:
jbe/bsw@0 1351 lua_settop(L, 1);
jbe/bsw@0 1352 lua_pushliteral(L, "references"); // 2
jbe/bsw@0 1353 lua_rawget(L, 1); // 2
jbe/bsw@0 1354 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1355 lua_pushliteral(L, "references"); // 3
jbe/bsw@0 1356 lua_newtable(L); // 4
jbe/bsw@0 1357 lua_rawset(L, 1);
jbe/bsw@0 1358 }
jbe@23 1359 // set "foreign_keys" attribute to empty table, unless it is already set:
jbe/bsw@0 1360 lua_settop(L, 1);
jbe/bsw@0 1361 lua_pushliteral(L, "foreign_keys"); // 2
jbe/bsw@0 1362 lua_rawget(L, 1); // 2
jbe/bsw@0 1363 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1364 lua_pushliteral(L, "foreign_keys"); // 3
jbe/bsw@0 1365 lua_newtable(L); // 4
jbe/bsw@0 1366 lua_rawset(L, 1);
jbe/bsw@0 1367 }
jbe@23 1368 // return table:
jbe/bsw@0 1369 lua_settop(L, 1);
jbe/bsw@0 1370 return 1;
jbe/bsw@0 1371 }
jbe/bsw@0 1372
jbe@23 1373 // method "get_reference" of classes (models):
jbe/bsw@0 1374 static int mondelefant_class_get_reference(lua_State *L) {
jbe/bsw@0 1375 lua_settop(L, 2);
jbe/bsw@0 1376 while (lua_toboolean(L, 1)) {
jbe@23 1377 // get "references" table:
jbe/bsw@0 1378 lua_getfield(L, 1, "references"); // 3
jbe@23 1379 // perform lookup:
jbe/bsw@0 1380 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1381 lua_gettable(L, 3); // 4
jbe@23 1382 // return result, if lookup was successful:
jbe/bsw@0 1383 if (!lua_isnil(L, 4)) return 1;
jbe@23 1384 // replace current table by its prototype:
jbe/bsw@0 1385 lua_settop(L, 2);
jbe/bsw@0 1386 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1387 lua_rawget(L, 1); // 3
jbe/bsw@0 1388 lua_replace(L, 1);
jbe/bsw@0 1389 }
jbe@23 1390 // return nothing:
jbe/bsw@0 1391 return 0;
jbe/bsw@0 1392 }
jbe/bsw@0 1393
jbe@23 1394 // method "iterate_over_references" of classes (models):
jbe/bsw@0 1395 static int mondelefant_class_iterate_over_references(lua_State *L) {
jbe/bsw@0 1396 return luaL_error(L, "Reference iterator not implemented yet."); // TODO
jbe/bsw@0 1397 }
jbe/bsw@0 1398
jbe@23 1399 // method "get_foreign_key_reference_name" of classes (models):
jbe/bsw@0 1400 static int mondelefant_class_get_foreign_key_reference_name(lua_State *L) {
jbe/bsw@0 1401 lua_settop(L, 2);
jbe/bsw@0 1402 while (lua_toboolean(L, 1)) {
jbe@23 1403 // get "foreign_keys" table:
jbe/bsw@0 1404 lua_getfield(L, 1, "foreign_keys"); // 3
jbe@23 1405 // perform lookup:
jbe/bsw@0 1406 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1407 lua_gettable(L, 3); // 4
jbe@23 1408 // return result, if lookup was successful:
jbe/bsw@0 1409 if (!lua_isnil(L, 4)) return 1;
jbe@23 1410 // replace current table by its prototype:
jbe/bsw@0 1411 lua_settop(L, 2);
jbe/bsw@0 1412 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1413 lua_rawget(L, 1); // 3
jbe/bsw@0 1414 lua_replace(L, 1);
jbe/bsw@0 1415 }
jbe@23 1416 // return nothing:
jbe/bsw@0 1417 return 0;
jbe/bsw@0 1418 }
jbe/bsw@0 1419
jbe@23 1420 // meta-method "__index" of database result lists and objects:
jbe/bsw@0 1421 static int mondelefant_result_index(lua_State *L) {
jbe/bsw@0 1422 const char *result_type;
jbe@23 1423 // only lookup, when key is a string not beginning with an underscore:
jbe/bsw@0 1424 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe@23 1425 return 0;
jbe/bsw@0 1426 }
jbe@23 1427 // get value of "_class" attribute, or default class, when unset:
jbe@23 1428 lua_settop(L, 2);
jbe/bsw@0 1429 lua_getfield(L, 1, "_class"); // 3
jbe/bsw@0 1430 if (!lua_toboolean(L, 3)) {
jbe/bsw@0 1431 lua_settop(L, 2);
jbe/bsw@0 1432 lua_getfield(L,
jbe/bsw@0 1433 LUA_REGISTRYINDEX,
jbe/bsw@0 1434 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1435 ); // 3
jbe/bsw@0 1436 }
jbe@23 1437 // get value of "_type" attribute:
jbe/bsw@0 1438 lua_getfield(L, 1, "_type"); // 4
jbe/bsw@0 1439 result_type = lua_tostring(L, 4);
jbe@23 1440 // different lookup for lists and objects:
jbe@23 1441 if (result_type && !strcmp(result_type, "object")) { // object
jbe/bsw@0 1442 lua_settop(L, 3);
jbe/bsw@0 1443 // try inherited attributes, methods or getter functions:
jbe/bsw@0 1444 while (lua_toboolean(L, 3)) {
jbe/bsw@0 1445 lua_getfield(L, 3, "object"); // 4
jbe/bsw@0 1446 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1447 lua_gettable(L, 4); // 5
jbe/bsw@0 1448 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 1449 lua_settop(L, 3);
jbe/bsw@0 1450 lua_getfield(L, 3, "object_get"); // 4
jbe/bsw@0 1451 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1452 lua_gettable(L, 4); // 5
jbe/bsw@0 1453 if (lua_toboolean(L, 5)) {
jbe/bsw@0 1454 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1455 lua_call(L, 1, 1); // 5
jbe/bsw@0 1456 return 1;
jbe/bsw@0 1457 }
jbe/bsw@0 1458 lua_settop(L, 3);
jbe/bsw@0 1459 lua_pushliteral(L, "prototype"); // 4
jbe/bsw@0 1460 lua_rawget(L, 3); // 4
jbe/bsw@0 1461 lua_replace(L, 3);
jbe/bsw@0 1462 }
jbe/bsw@0 1463 lua_settop(L, 2);
jbe/bsw@0 1464 // try primary keys of referenced objects:
jbe/bsw@0 1465 lua_pushcfunction(L,
jbe/bsw@0 1466 mondelefant_class_get_foreign_key_reference_name
jbe/bsw@0 1467 ); // 3
jbe/bsw@0 1468 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0 1469 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1470 lua_call(L, 2, 1); // 3
jbe/bsw@0 1471 if (!lua_isnil(L, 3)) {
jbe/bsw@0 1472 // reference name at stack position 3
jbe/bsw@0 1473 lua_pushcfunction(L, mondelefant_class_get_reference); // 4
jbe/bsw@0 1474 lua_getfield(L, 1, "_class"); // 5
jbe/bsw@0 1475 lua_pushvalue(L, 3); // 6
jbe/bsw@0 1476 lua_call(L, 2, 1); // reference info at stack position 4
jbe/bsw@0 1477 lua_getfield(L, 1, "_ref"); // 5
jbe/bsw@0 1478 lua_getfield(L, 4, "ref"); // 6
jbe/bsw@0 1479 lua_gettable(L, 5); // 6
jbe/bsw@0 1480 if (!lua_isnil(L, 6)) {
jbe/bsw@0 1481 if (lua_toboolean(L, 6)) {
jbe/bsw@0 1482 lua_getfield(L, 4, "that_key"); // 7
jbe/bsw@0 1483 if (lua_isnil(L, 7)) {
jbe/bsw@0 1484 return luaL_error(L, "Missing 'that_key' entry in model reference.");
jbe/bsw@0 1485 }
jbe/bsw@0 1486 lua_gettable(L, 6); // 7
jbe/bsw@0 1487 } else {
jbe/bsw@0 1488 lua_pushnil(L);
jbe/bsw@0 1489 }
jbe/bsw@0 1490 return 1;
jbe/bsw@0 1491 }
jbe/bsw@0 1492 }
jbe/bsw@0 1493 lua_settop(L, 2);
jbe/bsw@0 1494 // try normal data field info:
jbe/bsw@0 1495 lua_getfield(L, 1, "_data"); // 3
jbe/bsw@0 1496 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1497 lua_gettable(L, 3); // 4
jbe/bsw@0 1498 if (!lua_isnil(L, 4)) return 1;
jbe/bsw@0 1499 lua_settop(L, 2);
jbe/bsw@0 1500 // try cached referenced object (or cached NULL reference):
jbe/bsw@0 1501 lua_getfield(L, 1, "_ref"); // 3
jbe/bsw@0 1502 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1503 lua_gettable(L, 3); // 4
jbe/bsw@0 1504 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) {
jbe/bsw@0 1505 lua_pushnil(L);
jbe/bsw@0 1506 return 1;
jbe/bsw@0 1507 } else if (!lua_isnil(L, 4)) {
jbe/bsw@0 1508 return 1;
jbe/bsw@0 1509 }
jbe/bsw@0 1510 lua_settop(L, 2);
jbe/bsw@0 1511 // try to load a referenced object:
jbe/bsw@0 1512 lua_pushcfunction(L, mondelefant_class_get_reference); // 3
jbe/bsw@0 1513 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0 1514 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1515 lua_call(L, 2, 1); // 3
jbe/bsw@0 1516 if (!lua_isnil(L, 3)) {
jbe/bsw@0 1517 lua_settop(L, 2);
jbe/bsw@0 1518 lua_getfield(L, 1, "load"); // 3
jbe/bsw@0 1519 lua_pushvalue(L, 1); // 4 (self)
jbe/bsw@0 1520 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1521 lua_call(L, 2, 0);
jbe/bsw@0 1522 lua_settop(L, 2);
jbe/bsw@0 1523 lua_getfield(L, 1, "_ref"); // 3
jbe/bsw@0 1524 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1525 lua_gettable(L, 3); // 4
jbe/bsw@0 1526 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) lua_pushnil(L); // TODO: use special object instead of false
jbe/bsw@0 1527 return 1;
jbe/bsw@0 1528 }
jbe/bsw@0 1529 return 0;
jbe@23 1530 } else if (result_type && !strcmp(result_type, "list")) { // list
jbe/bsw@0 1531 lua_settop(L, 3);
jbe/bsw@0 1532 // try inherited list attributes or methods:
jbe/bsw@0 1533 while (lua_toboolean(L, 3)) {
jbe/bsw@0 1534 lua_getfield(L, 3, "list"); // 4
jbe/bsw@0 1535 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1536 lua_gettable(L, 4); // 5
jbe/bsw@0 1537 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 1538 lua_settop(L, 3);
jbe/bsw@0 1539 lua_pushliteral(L, "prototype"); // 4
jbe/bsw@0 1540 lua_rawget(L, 3); // 4
jbe/bsw@0 1541 lua_replace(L, 3);
jbe/bsw@0 1542 }
jbe/bsw@0 1543 }
jbe@23 1544 // return nothing:
jbe/bsw@0 1545 return 0;
jbe/bsw@0 1546 }
jbe/bsw@0 1547
jbe@23 1548 // meta-method "__newindex" of database result lists and objects:
jbe/bsw@0 1549 static int mondelefant_result_newindex(lua_State *L) {
jbe/bsw@0 1550 const char *result_type;
jbe@23 1551 // perform rawset, unless key is a string not starting with underscore:
jbe/bsw@0 1552 lua_settop(L, 3);
jbe/bsw@0 1553 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe/bsw@0 1554 lua_rawset(L, 1);
jbe/bsw@0 1555 return 1;
jbe/bsw@0 1556 }
jbe@23 1557 // get value of "_class" attribute, or default class, when unset:
jbe/bsw@0 1558 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0 1559 if (!lua_toboolean(L, 4)) {
jbe/bsw@0 1560 lua_settop(L, 3);
jbe/bsw@0 1561 lua_getfield(L,
jbe/bsw@0 1562 LUA_REGISTRYINDEX,
jbe/bsw@0 1563 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1564 ); // 4
jbe/bsw@0 1565 }
jbe@23 1566 // get value of "_type" attribute:
jbe/bsw@0 1567 lua_getfield(L, 1, "_type"); // 5
jbe/bsw@0 1568 result_type = lua_tostring(L, 5);
jbe@23 1569 // distinguish between lists and objects:
jbe@23 1570 if (result_type && !strcmp(result_type, "object")) { // objects
jbe/bsw@0 1571 lua_settop(L, 4);
jbe/bsw@0 1572 // try object setter functions:
jbe/bsw@0 1573 while (lua_toboolean(L, 4)) {
jbe/bsw@0 1574 lua_getfield(L, 4, "object_set"); // 5
jbe/bsw@0 1575 lua_pushvalue(L, 2); // 6
jbe/bsw@0 1576 lua_gettable(L, 5); // 6
jbe/bsw@0 1577 if (lua_toboolean(L, 6)) {
jbe/bsw@0 1578 lua_pushvalue(L, 1); // 7
jbe/bsw@0 1579 lua_pushvalue(L, 3); // 8
jbe/bsw@0 1580 lua_call(L, 2, 0);
jbe/bsw@0 1581 return 0;
jbe/bsw@0 1582 }
jbe/bsw@0 1583 lua_settop(L, 4);
jbe/bsw@0 1584 lua_pushliteral(L, "prototype"); // 5
jbe/bsw@0 1585 lua_rawget(L, 4); // 5
jbe/bsw@0 1586 lua_replace(L, 4);
jbe/bsw@0 1587 }
jbe/bsw@0 1588 lua_settop(L, 3);
jbe/bsw@0 1589 // check, if a object reference is changed:
jbe/bsw@0 1590 lua_pushcfunction(L, mondelefant_class_get_reference); // 4
jbe/bsw@0 1591 lua_getfield(L, 1, "_class"); // 5
jbe/bsw@0 1592 lua_pushvalue(L, 2); // 6
jbe/bsw@0 1593 lua_call(L, 2, 1); // 4
jbe/bsw@0 1594 if (!lua_isnil(L, 4)) {
jbe/bsw@0 1595 // store object in _ref table (use false for nil): // TODO: use special object instead of false
jbe/bsw@0 1596 lua_getfield(L, 1, "_ref"); // 5
jbe/bsw@0 1597 lua_pushvalue(L, 2); // 6
jbe/bsw@0 1598 if (lua_isnil(L, 3)) lua_pushboolean(L, 0); // 7
jbe/bsw@0 1599 else lua_pushvalue(L, 3); // 7
jbe/bsw@0 1600 lua_settable(L, 5);
jbe/bsw@0 1601 lua_settop(L, 4);
jbe/bsw@0 1602 // delete referencing key from _data table:
jbe/bsw@0 1603 lua_getfield(L, 4, "this_key"); // 5
jbe/bsw@0 1604 if (lua_isnil(L, 5)) {
jbe/bsw@0 1605 return luaL_error(L, "Missing 'this_key' entry in model reference.");
jbe/bsw@0 1606 }
jbe/bsw@0 1607 lua_getfield(L, 1, "_data"); // 6
jbe/bsw@0 1608 lua_pushvalue(L, 5); // 7
jbe/bsw@0 1609 lua_pushnil(L); // 8
jbe/bsw@0 1610 lua_settable(L, 6);
jbe/bsw@0 1611 lua_settop(L, 5);
jbe/bsw@0 1612 lua_getfield(L, 1, "_dirty"); // 6
jbe/bsw@0 1613 lua_pushvalue(L, 5); // 7
jbe/bsw@0 1614 lua_pushboolean(L, 1); // 8
jbe/bsw@0 1615 lua_settable(L, 6);
jbe/bsw@0 1616 return 0;
jbe/bsw@0 1617 }
jbe/bsw@0 1618 lua_settop(L, 3);
jbe/bsw@0 1619 // store value in data field info:
jbe/bsw@0 1620 lua_getfield(L, 1, "_data"); // 4
jbe/bsw@0 1621 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1622 lua_pushvalue(L, 3); // 6
jbe/bsw@0 1623 lua_settable(L, 4);
jbe/bsw@0 1624 lua_settop(L, 3);
jbe/bsw@0 1625 // mark field as dirty (needs to be UPDATEd on save):
jbe/bsw@0 1626 lua_getfield(L, 1, "_dirty"); // 4
jbe/bsw@0 1627 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1628 lua_pushboolean(L, 1); // 6
jbe/bsw@0 1629 lua_settable(L, 4);
jbe/bsw@0 1630 lua_settop(L, 3);
jbe/bsw@0 1631 // reset reference cache, if neccessary:
jbe/bsw@0 1632 lua_pushcfunction(L,
jbe/bsw@0 1633 mondelefant_class_get_foreign_key_reference_name
jbe/bsw@0 1634 ); // 4
jbe/bsw@0 1635 lua_getfield(L, 1, "_class"); // 5
jbe/bsw@0 1636 lua_pushvalue(L, 2); // 6
jbe/bsw@0 1637 lua_call(L, 2, 1); // 4
jbe/bsw@0 1638 if (!lua_isnil(L, 4)) {
jbe/bsw@0 1639 lua_getfield(L, 1, "_ref"); // 5
jbe/bsw@0 1640 lua_pushvalue(L, 4); // 6
jbe/bsw@0 1641 lua_pushnil(L); // 7
jbe/bsw@0 1642 lua_settable(L, 5);
jbe/bsw@0 1643 }
jbe/bsw@0 1644 return 0;
jbe@23 1645 } else { // non-objects (i.e. lists)
jbe@23 1646 // perform rawset:
jbe/bsw@0 1647 lua_settop(L, 3);
jbe/bsw@0 1648 lua_rawset(L, 1);
jbe/bsw@0 1649 return 0;
jbe/bsw@0 1650 }
jbe/bsw@0 1651 }
jbe/bsw@0 1652
jbe@23 1653 // meta-method "__index" of classes (models):
jbe/bsw@0 1654 static int mondelefant_class_index(lua_State *L) {
jbe@23 1655 // perform lookup in prototype:
jbe/bsw@0 1656 lua_settop(L, 2);
jbe/bsw@0 1657 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1658 lua_rawget(L, 1); // 3
jbe/bsw@0 1659 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1660 lua_gettable(L, 3); // 4
jbe/bsw@0 1661 return 1;
jbe/bsw@0 1662 }
jbe/bsw@0 1663
jbe@23 1664 // registration information for functions of library:
jbe/bsw@0 1665 static const struct luaL_Reg mondelefant_module_functions[] = {
jbe/bsw@0 1666 {"connect", mondelefant_connect},
jbe/bsw@0 1667 {"set_class", mondelefant_set_class},
jbe/bsw@0 1668 {"new_class", mondelefant_new_class},
jbe/bsw@0 1669 {NULL, NULL}
jbe/bsw@0 1670 };
jbe/bsw@0 1671
jbe@23 1672 // registration information for meta-methods of database connections:
jbe/bsw@0 1673 static const struct luaL_Reg mondelefant_conn_mt_functions[] = {
jbe/bsw@0 1674 {"__gc", mondelefant_conn_free},
jbe/bsw@0 1675 {"__index", mondelefant_conn_index},
jbe/bsw@0 1676 {"__newindex", mondelefant_conn_newindex},
jbe/bsw@0 1677 {NULL, NULL}
jbe/bsw@0 1678 };
jbe/bsw@0 1679
jbe@23 1680 // registration information for methods of database connections:
jbe/bsw@0 1681 static const struct luaL_Reg mondelefant_conn_methods[] = {
jbe/bsw@0 1682 {"close", mondelefant_conn_close},
jbe/bsw@0 1683 {"is_ok", mondelefant_conn_is_ok},
jbe/bsw@0 1684 {"get_transaction_status", mondelefant_conn_get_transaction_status},
jbe/bsw@0 1685 {"create_list", mondelefant_conn_create_list},
jbe/bsw@0 1686 {"create_object", mondelefant_conn_create_object},
jbe/bsw@0 1687 {"quote_string", mondelefant_conn_quote_string},
jbe/bsw@0 1688 {"quote_binary", mondelefant_conn_quote_binary},
jbe/bsw@0 1689 {"assemble_command", mondelefant_conn_assemble_command},
jbe/bsw@0 1690 {"try_query", mondelefant_conn_try_query},
jbe/bsw@0 1691 {"query", mondelefant_conn_query},
jbe/bsw@0 1692 {NULL, NULL}
jbe/bsw@0 1693 };
jbe/bsw@0 1694
jbe@23 1695 // registration information for meta-methods of error objects:
jbe/bsw@0 1696 static const struct luaL_Reg mondelefant_errorobject_mt_functions[] = {
jbe/bsw@0 1697 {NULL, NULL}
jbe/bsw@0 1698 };
jbe/bsw@0 1699
jbe@23 1700 // registration information for methods of error objects:
jbe/bsw@0 1701 static const struct luaL_Reg mondelefant_errorobject_methods[] = {
jbe/bsw@0 1702 {"escalate", mondelefant_errorobject_escalate},
jbe/bsw@0 1703 {"is_kind_of", mondelefant_errorobject_is_kind_of},
jbe/bsw@0 1704 {NULL, NULL}
jbe/bsw@0 1705 };
jbe/bsw@0 1706
jbe@23 1707 // registration information for meta-methods of database result lists/objects:
jbe/bsw@0 1708 static const struct luaL_Reg mondelefant_result_mt_functions[] = {
jbe/bsw@0 1709 {"__index", mondelefant_result_index},
jbe/bsw@0 1710 {"__newindex", mondelefant_result_newindex},
jbe/bsw@0 1711 {NULL, NULL}
jbe/bsw@0 1712 };
jbe/bsw@0 1713
jbe@23 1714 // registration information for methods of database result lists/objects:
jbe/bsw@0 1715 static const struct luaL_Reg mondelefant_class_mt_functions[] = {
jbe/bsw@0 1716 {"__index", mondelefant_class_index},
jbe/bsw@0 1717 {NULL, NULL}
jbe/bsw@0 1718 };
jbe/bsw@0 1719
jbe@23 1720 // registration information for methods of classes (models):
jbe/bsw@0 1721 static const struct luaL_Reg mondelefant_class_methods[] = {
jbe/bsw@0 1722 {"get_reference", mondelefant_class_get_reference},
jbe/bsw@0 1723 {"iterate_over_references", mondelefant_class_iterate_over_references},
jbe/bsw@0 1724 {"get_foreign_key_reference_name",
jbe/bsw@0 1725 mondelefant_class_get_foreign_key_reference_name},
jbe/bsw@0 1726 {NULL, NULL}
jbe/bsw@0 1727 };
jbe/bsw@0 1728
jbe@23 1729 // registration information for methods of database result objects (not lists!):
jbe/bsw@0 1730 static const struct luaL_Reg mondelefant_object_methods[] = {
jbe/bsw@0 1731 {NULL, NULL}
jbe/bsw@0 1732 };
jbe/bsw@0 1733
jbe@23 1734 // registration information for methods of database result lists (not single objects!):
jbe/bsw@0 1735 static const struct luaL_Reg mondelefant_list_methods[] = {
jbe/bsw@0 1736 {NULL, NULL}
jbe/bsw@0 1737 };
jbe/bsw@0 1738
jbe@23 1739 // luaopen function to initialize/register library:
jbe/bsw@0 1740 int luaopen_mondelefant_native(lua_State *L) {
jbe/bsw@0 1741 lua_settop(L, 0);
jbe/bsw@0 1742 lua_newtable(L); // module at stack position 1
jbe/bsw@0 1743 luaL_register(L, NULL, mondelefant_module_functions);
jbe/bsw@0 1744
jbe/bsw@0 1745 lua_pushvalue(L, 1); // 2
jbe/bsw@0 1746 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe/bsw@0 1747
jbe/bsw@0 1748 lua_newtable(L); // 2
jbe/bsw@0 1749 // NOTE: only PostgreSQL is supported yet:
jbe/bsw@0 1750 luaL_register(L, NULL, mondelefant_conn_methods);
jbe/bsw@0 1751 lua_setfield(L, 1, "postgresql_connection_prototype");
jbe/bsw@0 1752 lua_newtable(L); // 2
jbe/bsw@0 1753 lua_setfield(L, 1, "connection_prototype");
jbe/bsw@0 1754
jbe/bsw@0 1755 luaL_newmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe/bsw@0 1756 luaL_register(L, NULL, mondelefant_conn_mt_functions);
jbe/bsw@0 1757 lua_settop(L, 1);
jbe/bsw@0 1758 luaL_newmetatable(L, MONDELEFANT_RESULT_MT_REGKEY); // 2
jbe/bsw@0 1759 luaL_register(L, NULL, mondelefant_result_mt_functions);
jbe/bsw@0 1760 lua_setfield(L, 1, "result_metatable");
jbe/bsw@0 1761 luaL_newmetatable(L, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe/bsw@0 1762 luaL_register(L, NULL, mondelefant_class_mt_functions);
jbe/bsw@0 1763 lua_setfield(L, 1, "class_metatable");
jbe/bsw@0 1764
jbe/bsw@0 1765 lua_newtable(L); // 2
jbe/bsw@0 1766 lua_newtable(L); // 3
jbe/bsw@0 1767 luaL_register(L, NULL, mondelefant_object_methods);
jbe/bsw@0 1768 lua_setfield(L, 2, "object");
jbe/bsw@0 1769 lua_newtable(L); // 3
jbe/bsw@0 1770 lua_setfield(L, 2, "object_get");
jbe/bsw@0 1771 lua_newtable(L); // 3
jbe/bsw@0 1772 lua_setfield(L, 2, "object_set");
jbe/bsw@0 1773 lua_newtable(L); // 3
jbe/bsw@0 1774 luaL_register(L, NULL, mondelefant_list_methods);
jbe/bsw@0 1775 lua_setfield(L, 2, "list");
jbe/bsw@0 1776 lua_newtable(L); // 3
jbe/bsw@0 1777 lua_setfield(L, 2, "references");
jbe/bsw@0 1778 lua_newtable(L); // 3
jbe/bsw@0 1779 lua_setfield(L, 2, "foreign_keys");
jbe/bsw@0 1780 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1781 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY);
jbe/bsw@0 1782 lua_setfield(L, 1, "class_prototype");
jbe/bsw@0 1783
jbe/bsw@0 1784 lua_newtable(L); // 2
jbe/bsw@0 1785 lua_pushliteral(L, "k"); // 3
jbe/bsw@0 1786 lua_setfield(L, 2, "__mode");
jbe/bsw@0 1787 lua_newtable(L); // 3
jbe/bsw@0 1788 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1789 lua_setmetatable(L, 3);
jbe/bsw@0 1790 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CONN_DATA_REGKEY);
jbe/bsw@0 1791 lua_settop(L, 1);
jbe/bsw@0 1792
jbe/bsw@0 1793 luaL_newmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY); // 2
jbe/bsw@0 1794 luaL_register(L, NULL, mondelefant_errorobject_mt_functions);
jbe/bsw@0 1795 lua_newtable(L); // 3
jbe/bsw@0 1796 luaL_register(L, NULL, mondelefant_errorobject_methods);
jbe/bsw@0 1797 lua_setfield(L, 2, "__index");
jbe/bsw@0 1798 lua_setfield(L, 1, "errorobject_metatable");
jbe/bsw@0 1799
jbe/bsw@0 1800 return 1;
jbe/bsw@0 1801 }

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