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annotate libraries/mondelefant/mondelefant_native.c @ 400:7b183a70a37d

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Bugfix in "document_column" write mechanism: write to document field when column does NOT exist
author jbe
date Mon Jan 04 00:42:28 2016 +0100 (2016-01-04)
parents ef3201ed67f5
children ad437022be90
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@23 12 #define MONDELEFANT_REGKEY "e449ba8d9a53d353_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/bsw@0 26
jbe@23 27 // C-structure for database connection userdata:
jbe/bsw@0 28 typedef struct {
jbe/bsw@0 29 PGconn *pgconn;
jbe/bsw@0 30 int server_encoding;
jbe/bsw@0 31 } mondelefant_conn_t;
jbe@23 32 #define MONDELEFANT_SERVER_ENCODING_ASCII 0
jbe@23 33 #define MONDELEFANT_SERVER_ENCODING_UTF8 1
jbe/bsw@0 34
jbe@23 35 // transform codepoint-position to byte-position for a given UTF-8 string:
jbe/bsw@0 36 static size_t utf8_position_to_byte(const char *str, size_t utf8pos) {
jbe/bsw@0 37 size_t bytepos;
jbe/bsw@0 38 for (bytepos = 0; utf8pos > 0; bytepos++) {
jbe/bsw@0 39 uint8_t c;
jbe/bsw@0 40 c = ((const uint8_t *)str)[bytepos];
jbe/bsw@0 41 if (!c) break;
jbe/bsw@0 42 if (c <= 0x7f || c >= 0xc0) utf8pos--;
jbe/bsw@0 43 }
jbe/bsw@0 44 return bytepos;
jbe/bsw@0 45 }
jbe/bsw@0 46
jbe@23 47 // PostgreSQL's OID for binary data type (bytea):
jbe/bsw@0 48 #define MONDELEFANT_POSTGRESQL_BINARY_OID ((Oid)17)
jbe/bsw@0 49
jbe@23 50 // mapping a PostgreSQL type given by its OID to a string identifier:
jbe/bsw@0 51 static const char *mondelefant_oid_to_typestr(Oid oid) {
jbe/bsw@0 52 switch (oid) {
jbe/bsw@0 53 case 16: return "bool";
jbe/bsw@0 54 case 17: return "bytea";
jbe/bsw@0 55 case 18: return "char";
jbe/bsw@0 56 case 19: return "name";
jbe/bsw@0 57 case 20: return "int8";
jbe/bsw@0 58 case 21: return "int2";
jbe/bsw@0 59 case 23: return "int4";
jbe/bsw@0 60 case 25: return "text";
jbe/bsw@0 61 case 26: return "oid";
jbe/bsw@0 62 case 27: return "tid";
jbe/bsw@0 63 case 28: return "xid";
jbe/bsw@0 64 case 29: return "cid";
jbe@176 65 case 114: return "json";
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@176 91 case 3802: return "jsonb";
jbe/bsw@0 92 default: return NULL;
jbe/bsw@0 93 }
jbe/bsw@0 94 }
jbe/bsw@0 95
jbe@23 96 // This library maps PostgreSQL's error codes to CamelCase string
jbe@23 97 // identifiers, which consist of CamelCase identifiers and are seperated
jbe@23 98 // by dots (".") (no leading or trailing dots).
jbe@23 99 // There are additional error identifiers which do not have a corresponding
jbe@23 100 // PostgreSQL error associated with it.
jbe@23 101
jbe@23 102 // matching start of local variable 'pgcode' against string 'incode',
jbe@23 103 // returning string 'outcode' on match:
jbe/bsw@0 104 #define mondelefant_errcode_item(incode, outcode) \
jbe/bsw@0 105 if (!strncmp(pgcode, (incode), strlen(incode))) return outcode; else
jbe/bsw@0 106
jbe@23 107 // additional error identifiers without corresponding PostgreSQL error:
jbe/bsw@0 108 #define MONDELEFANT_ERRCODE_UNKNOWN "unknown"
jbe/bsw@0 109 #define MONDELEFANT_ERRCODE_CONNECTION "ConnectionException"
jbe/bsw@0 110 #define MONDELEFANT_ERRCODE_RESULTCOUNT_LOW "WrongResultSetCount.ResultSetMissing"
jbe/bsw@0 111 #define MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH "WrongResultSetCount.TooManyResults"
jbe/bsw@0 112 #define MONDELEFANT_ERRCODE_QUERY1_NO_ROWS "NoData.OneRowExpected"
jbe/bsw@0 113 #define MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS "CardinalityViolation.OneRowExpected"
jbe/bsw@0 114
jbe@23 115 // mapping PostgreSQL error code to error code as returned by this library:
jbe/bsw@0 116 static const char *mondelefant_translate_errcode(const char *pgcode) {
jbe/bsw@0 117 if (!pgcode) abort(); // should not happen
jbe/bsw@0 118 mondelefant_errcode_item("02", "NoData")
jbe/bsw@0 119 mondelefant_errcode_item("03", "SqlStatementNotYetComplete")
jbe/bsw@0 120 mondelefant_errcode_item("08", "ConnectionException")
jbe/bsw@0 121 mondelefant_errcode_item("09", "TriggeredActionException")
jbe/bsw@0 122 mondelefant_errcode_item("0A", "FeatureNotSupported")
jbe/bsw@0 123 mondelefant_errcode_item("0B", "InvalidTransactionInitiation")
jbe/bsw@0 124 mondelefant_errcode_item("0F", "LocatorException")
jbe/bsw@0 125 mondelefant_errcode_item("0L", "InvalidGrantor")
jbe/bsw@0 126 mondelefant_errcode_item("0P", "InvalidRoleSpecification")
jbe/bsw@0 127 mondelefant_errcode_item("21", "CardinalityViolation")
jbe/bsw@0 128 mondelefant_errcode_item("22", "DataException")
jbe/bsw@0 129 mondelefant_errcode_item("23001", "IntegrityConstraintViolation.RestrictViolation")
jbe/bsw@0 130 mondelefant_errcode_item("23502", "IntegrityConstraintViolation.NotNullViolation")
jbe/bsw@0 131 mondelefant_errcode_item("23503", "IntegrityConstraintViolation.ForeignKeyViolation")
jbe/bsw@0 132 mondelefant_errcode_item("23505", "IntegrityConstraintViolation.UniqueViolation")
jbe/bsw@0 133 mondelefant_errcode_item("23514", "IntegrityConstraintViolation.CheckViolation")
jbe/bsw@0 134 mondelefant_errcode_item("23", "IntegrityConstraintViolation")
jbe/bsw@0 135 mondelefant_errcode_item("24", "InvalidCursorState")
jbe/bsw@0 136 mondelefant_errcode_item("25", "InvalidTransactionState")
jbe/bsw@0 137 mondelefant_errcode_item("26", "InvalidSqlStatementName")
jbe/bsw@0 138 mondelefant_errcode_item("27", "TriggeredDataChangeViolation")
jbe/bsw@0 139 mondelefant_errcode_item("28", "InvalidAuthorizationSpecification")
jbe/bsw@0 140 mondelefant_errcode_item("2B", "DependentPrivilegeDescriptorsStillExist")
jbe/bsw@0 141 mondelefant_errcode_item("2D", "InvalidTransactionTermination")
jbe/bsw@0 142 mondelefant_errcode_item("2F", "SqlRoutineException")
jbe/bsw@0 143 mondelefant_errcode_item("34", "InvalidCursorName")
jbe/bsw@0 144 mondelefant_errcode_item("38", "ExternalRoutineException")
jbe/bsw@0 145 mondelefant_errcode_item("39", "ExternalRoutineInvocationException")
jbe/bsw@0 146 mondelefant_errcode_item("3B", "SavepointException")
jbe/bsw@0 147 mondelefant_errcode_item("3D", "InvalidCatalogName")
jbe/bsw@0 148 mondelefant_errcode_item("3F", "InvalidSchemaName")
jbe/bsw@0 149 mondelefant_errcode_item("40", "TransactionRollback")
jbe/bsw@0 150 mondelefant_errcode_item("42", "SyntaxErrorOrAccessRuleViolation")
jbe/bsw@0 151 mondelefant_errcode_item("44", "WithCheckOptionViolation")
jbe/bsw@0 152 mondelefant_errcode_item("53", "InsufficientResources")
jbe/bsw@0 153 mondelefant_errcode_item("54", "ProgramLimitExceeded")
jbe/bsw@0 154 mondelefant_errcode_item("55", "ObjectNotInPrerequisiteState")
jbe/bsw@0 155 mondelefant_errcode_item("57", "OperatorIntervention")
jbe/bsw@0 156 mondelefant_errcode_item("58", "SystemError")
jbe/bsw@0 157 mondelefant_errcode_item("F0", "ConfigurationFileError")
jbe/bsw@0 158 mondelefant_errcode_item("P0", "PlpgsqlError")
jbe/bsw@0 159 mondelefant_errcode_item("XX", "InternalError")
jbe/bsw@0 160 return "unknown";
jbe/bsw@0 161 }
jbe/bsw@0 162
jbe@23 163 // C-function, checking if a given error code (as defined by this library)
jbe@23 164 // is belonging to a certain class of errors (strings are equal or error
jbe@23 165 // code begins with error class followed by a dot):
jbe/bsw@0 166 static int mondelefant_check_error_class(
jbe/bsw@0 167 const char *errcode, const char *errclass
jbe/bsw@0 168 ) {
jbe/bsw@0 169 size_t i = 0;
jbe/bsw@0 170 while (1) {
jbe/bsw@0 171 if (errclass[i] == 0) {
jbe/bsw@0 172 if (errcode[i] == 0 || errcode[i] == '.') return 1;
jbe/bsw@0 173 else return 0;
jbe/bsw@0 174 }
jbe/bsw@0 175 if (errcode[i] != errclass[i]) return 0;
jbe/bsw@0 176 i++;
jbe/bsw@0 177 }
jbe/bsw@0 178 }
jbe/bsw@0 179
jbe@23 180 // pushing first line of a string on Lua's stack (without trailing CR/LF):
jbe/bsw@0 181 static void mondelefant_push_first_line(lua_State *L, const char *str) {
jbe/bsw@0 182 size_t i = 0;
jbe/bsw@0 183 if (!str) abort(); // should not happen
jbe/bsw@0 184 while (1) {
jbe@397 185 char c = str[i];
jbe@397 186 if (c == '\n' || c == '\r' || c == 0) {
jbe@397 187 lua_pushlstring(L, str, i);
jbe@397 188 return;
jbe@397 189 }
jbe/bsw@0 190 i++;
jbe@397 191 }
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@397 201 // expect a table as first argument:
jbe@397 202 luaL_checktype(L, 1, LUA_TTABLE);
jbe@23 203 // if engine is anything but "postgresql", then raise error:
jbe/bsw@0 204 lua_settop(L, 1);
jbe/bsw@0 205 lua_getfield(L, 1, "engine"); // 2
jbe/bsw@0 206 if (!lua_toboolean(L, 2)) {
jbe@397 207 return luaL_argerror(L, 1, "no database engine selected");
jbe/bsw@0 208 }
jbe/bsw@0 209 lua_pushliteral(L, "postgresql"); // 3
jbe/bsw@0 210 if (!lua_rawequal(L, 2, 3)) {
jbe@397 211 return luaL_argerror(L, 1,
jbe@397 212 "only database engine 'postgresql' is supported"
jbe/bsw@0 213 );
jbe/bsw@0 214 }
jbe@40 215 // copy conninfo string for PQconnectdb function from argument table to
jbe@40 216 // stack position 2:
jbe/bsw@0 217 lua_settop(L, 1);
jbe@40 218 lua_getfield(L, 1, "conninfo"); // 2
jbe@40 219 // if no conninfo string was found, then assemble one from the named
jbe@40 220 // options except "engine" option:
jbe@40 221 if (!lua_toboolean(L, 2)) {
jbe@40 222 lua_settop(L, 1);
jbe@40 223 lua_pushnil(L); // slot for key at stack position 2
jbe@40 224 lua_pushnil(L); // slot for value at stack position 3
jbe@40 225 luaL_buffinit(L, &buf);
jbe@40 226 {
jbe@40 227 int need_seperator = 0;
jbe@40 228 while (lua_pushvalue(L, 2), lua_next(L, 1)) {
jbe@40 229 lua_replace(L, 3);
jbe@40 230 lua_replace(L, 2);
jbe@40 231 // NOTE: numbers will be converted to strings automatically here,
jbe@40 232 // but perhaps this will change in future versions of lua
jbe@40 233 luaL_argcheck(L,
jbe@397 234 lua_isstring(L, 2) && lua_isstring(L, 3), 1, "key is not a string"
jbe@40 235 );
jbe@40 236 lua_pushvalue(L, 2);
jbe@40 237 lua_pushliteral(L, "engine");
jbe@40 238 if (!lua_rawequal(L, -2, -1)) {
jbe@40 239 const char *value;
jbe@40 240 size_t value_len;
jbe@40 241 size_t value_pos = 0;
jbe@40 242 lua_pop(L, 1);
jbe@40 243 if (need_seperator) luaL_addchar(&buf, ' ');
jbe@40 244 luaL_addvalue(&buf);
jbe@40 245 luaL_addchar(&buf, '=');
jbe@40 246 luaL_addchar(&buf, '\'');
jbe@40 247 value = lua_tolstring(L, 3, &value_len);
jbe@40 248 do {
jbe@40 249 char c;
jbe@40 250 c = value[value_pos++];
jbe@40 251 if (c == '\'') luaL_addchar(&buf, '\\');
jbe@40 252 luaL_addchar(&buf, c);
jbe@40 253 } while (value_pos < value_len);
jbe@40 254 luaL_addchar(&buf, '\'');
jbe@40 255 need_seperator = 1;
jbe@40 256 } else {
jbe@40 257 lua_pop(L, 1);
jbe@40 258 }
jbe/bsw@0 259 }
jbe/bsw@0 260 }
jbe@40 261 luaL_pushresult(&buf);
jbe@40 262 lua_replace(L, 2);
jbe@40 263 lua_settop(L, 2);
jbe/bsw@0 264 }
jbe@40 265 // use conninfo string on stack position 2:
jbe/bsw@0 266 conninfo = lua_tostring(L, 2);
jbe@23 267 // call PQconnectdb function of libpq:
jbe/bsw@0 268 pgconn = PQconnectdb(conninfo);
jbe@397 269 // throw or return errors, if neccessary:
jbe/bsw@0 270 if (!pgconn) {
jbe/bsw@0 271 return luaL_error(L,
jbe/bsw@0 272 "Error in libpq while creating 'PGconn' structure."
jbe/bsw@0 273 );
jbe/bsw@0 274 }
jbe/bsw@0 275 if (PQstatus(pgconn) != CONNECTION_OK) {
jbe@397 276 lua_pushnil(L); // 3
jbe@397 277 mondelefant_push_first_line(L, PQerrorMessage(pgconn)); // 4
jbe@397 278 lua_newtable(L); // 5
jbe@397 279 lua_getfield(L,
jbe@397 280 LUA_REGISTRYINDEX,
jbe@397 281 MONDELEFANT_ERROROBJECT_MT_REGKEY
jbe@397 282 );
jbe@397 283 lua_setmetatable(L, 5);
jbe/bsw@0 284 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@397 285 lua_setfield(L, 5, "code");
jbe@397 286 lua_pushvalue(L, 4);
jbe@397 287 lua_setfield(L, 5, "message");
jbe/bsw@0 288 PQfinish(pgconn);
jbe/bsw@0 289 return 3;
jbe/bsw@0 290 }
jbe@23 291 // create userdata:
jbe/bsw@0 292 lua_settop(L, 0);
jbe/bsw@0 293 conn = lua_newuserdata(L, sizeof(*conn)); // 1
jbe@23 294 // set 'pgconn' in C-struct of userdata:
jbe/bsw@0 295 conn->pgconn = pgconn;
jbe@23 296 // set 'server_encoding' in C-struct of userdata:
jbe/bsw@0 297 {
jbe/bsw@0 298 const char *charset;
jbe/bsw@0 299 charset = PQparameterStatus(pgconn, "server_encoding");
jbe/bsw@0 300 if (charset && !strcmp(charset, "UTF8")) {
jbe/bsw@0 301 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_UTF8;
jbe/bsw@0 302 } else {
jbe/bsw@0 303 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_ASCII;
jbe/bsw@0 304 }
jbe/bsw@0 305 }
jbe@23 306 // set meta-table of userdata:
jbe/bsw@0 307 luaL_getmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe/bsw@0 308 lua_setmetatable(L, 1);
jbe@396 309 // create and associate userdata table:
jbe@396 310 lua_newtable(L);
jbe@396 311 lua_setuservalue(L, 1);
jbe@396 312 // store key "fd" with file descriptor of connection:
jbe@396 313 lua_pushinteger(L, PQsocket(pgconn));
jbe@396 314 lua_setfield(L, 1, "fd");
jbe@23 315 // store key "engine" with value "postgresql" as connection specific data:
jbe/bsw@0 316 lua_pushliteral(L, "postgresql");
jbe/bsw@0 317 lua_setfield(L, 1, "engine");
jbe@23 318 // return userdata:
jbe/bsw@0 319 return 1;
jbe/bsw@0 320 }
jbe/bsw@0 321
jbe@23 322 // returns pointer to libpq handle 'pgconn' of userdata at given index
jbe@23 323 // (or throws error, if database connection has been closed):
jbe/bsw@0 324 static mondelefant_conn_t *mondelefant_get_conn(lua_State *L, int index) {
jbe/bsw@0 325 mondelefant_conn_t *conn;
jbe/bsw@0 326 conn = luaL_checkudata(L, index, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 327 if (!conn->pgconn) {
jbe/bsw@0 328 luaL_error(L, "PostgreSQL connection has been closed.");
jbe/bsw@0 329 return NULL;
jbe/bsw@0 330 }
jbe/bsw@0 331 return conn;
jbe/bsw@0 332 }
jbe/bsw@0 333
jbe@23 334 // meta-method "__index" of database handles (userdata):
jbe/bsw@0 335 static int mondelefant_conn_index(lua_State *L) {
jbe@23 336 // try table for connection specific data:
jbe/bsw@0 337 lua_settop(L, 2);
jbe@396 338 lua_getuservalue(L, 1); // 3
jbe/bsw@0 339 lua_pushvalue(L, 2); // 4
jbe/bsw@0 340 lua_gettable(L, 3); // 4
jbe/bsw@0 341 if (!lua_isnil(L, 4)) return 1;
jbe@23 342 // try to use prototype stored in connection specific data:
jbe/bsw@0 343 lua_settop(L, 3);
jbe/bsw@0 344 lua_getfield(L, 3, "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 "postgresql_connection_prototype" of library:
jbe/bsw@0 351 lua_settop(L, 2);
jbe/bsw@0 352 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY); // 3
jbe/bsw@0 353 lua_getfield(L, 3, "postgresql_connection_prototype"); // 4
jbe/bsw@0 354 if (lua_toboolean(L, 4)) {
jbe/bsw@0 355 lua_pushvalue(L, 2); // 5
jbe/bsw@0 356 lua_gettable(L, 4); // 5
jbe/bsw@0 357 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 358 }
jbe@23 359 // try to use "connection_prototype" of library:
jbe/bsw@0 360 lua_settop(L, 3);
jbe/bsw@0 361 lua_getfield(L, 3, "connection_prototype"); // 4
jbe/bsw@0 362 if (lua_toboolean(L, 4)) {
jbe/bsw@0 363 lua_pushvalue(L, 2); // 5
jbe/bsw@0 364 lua_gettable(L, 4); // 5
jbe/bsw@0 365 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 366 }
jbe@23 367 // give up and return nothing:
jbe/bsw@0 368 return 0;
jbe/bsw@0 369 }
jbe/bsw@0 370
jbe@23 371 // meta-method "__newindex" of database handles (userdata):
jbe/bsw@0 372 static int mondelefant_conn_newindex(lua_State *L) {
jbe@23 373 // store key-value pair in table for connection specific data:
jbe/bsw@0 374 lua_settop(L, 3);
jbe@396 375 lua_getuservalue(L, 1); // 4
jbe/bsw@0 376 lua_pushvalue(L, 2);
jbe/bsw@0 377 lua_pushvalue(L, 3);
jbe/bsw@0 378 lua_settable(L, 4);
jbe@23 379 // return nothing:
jbe/bsw@0 380 return 0;
jbe/bsw@0 381 }
jbe/bsw@0 382
jbe@23 383 // meta-method "__gc" of database handles:
jbe/bsw@0 384 static int mondelefant_conn_free(lua_State *L) {
jbe/bsw@0 385 mondelefant_conn_t *conn;
jbe/bsw@0 386 conn = luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 387 if (conn->pgconn) PQfinish(conn->pgconn);
jbe/bsw@0 388 conn->pgconn = NULL;
jbe/bsw@0 389 return 0;
jbe/bsw@0 390 }
jbe/bsw@0 391
jbe@23 392 // method "close" of database handles:
jbe/bsw@0 393 static int mondelefant_conn_close(lua_State *L) {
jbe/bsw@0 394 mondelefant_conn_t *conn;
jbe/bsw@0 395 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 396 PQfinish(conn->pgconn);
jbe/bsw@0 397 conn->pgconn = NULL;
jbe@397 398 lua_pushnil(L);
jbe@396 399 lua_setfield(L, 1, "fd"); // set "fd" attribute to nil
jbe/bsw@0 400 return 0;
jbe/bsw@0 401 }
jbe/bsw@0 402
jbe@23 403 // method "is_okay" of database handles:
jbe/bsw@0 404 static int mondelefant_conn_is_ok(lua_State *L) {
jbe/bsw@0 405 mondelefant_conn_t *conn;
jbe/bsw@0 406 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 407 lua_pushboolean(L, PQstatus(conn->pgconn) == CONNECTION_OK);
jbe/bsw@0 408 return 1;
jbe/bsw@0 409 }
jbe/bsw@0 410
jbe@23 411 // method "get_transaction_status" of database handles:
jbe/bsw@0 412 static int mondelefant_conn_get_transaction_status(lua_State *L) {
jbe/bsw@0 413 mondelefant_conn_t *conn;
jbe/bsw@0 414 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 415 switch (PQtransactionStatus(conn->pgconn)) {
jbe/bsw@0 416 case PQTRANS_IDLE:
jbe/bsw@0 417 lua_pushliteral(L, "idle");
jbe/bsw@0 418 break;
jbe/bsw@0 419 case PQTRANS_ACTIVE:
jbe/bsw@0 420 lua_pushliteral(L, "active");
jbe/bsw@0 421 break;
jbe/bsw@0 422 case PQTRANS_INTRANS:
jbe/bsw@0 423 lua_pushliteral(L, "intrans");
jbe/bsw@0 424 break;
jbe/bsw@0 425 case PQTRANS_INERROR:
jbe/bsw@0 426 lua_pushliteral(L, "inerror");
jbe/bsw@0 427 break;
jbe/bsw@0 428 default:
jbe/bsw@0 429 lua_pushliteral(L, "unknown");
jbe/bsw@0 430 }
jbe/bsw@0 431 return 1;
jbe/bsw@0 432 }
jbe/bsw@0 433
jbe@397 434 // method "try_wait" of database handles:
jbe@397 435 static int mondelefant_conn_try_wait(lua_State *L) {
jbe@393 436 mondelefant_conn_t *conn;
jbe@393 437 int infinite, nonblock = 0;
jbe@393 438 struct timespec wakeup;
jbe@393 439 int fd;
jbe@393 440 fd_set fds;
jbe@393 441 conn = mondelefant_get_conn(L, 1);
jbe@393 442 infinite = lua_isnoneornil(L, 2);
jbe@393 443 if (!infinite) {
jbe@393 444 lua_Number n;
jbe@393 445 int isnum;
jbe@393 446 n = lua_tonumberx(L, 2, &isnum);
jbe@393 447 if (isnum && n>0 && n<=86400*366) {
jbe@393 448 if (clock_gettime(CLOCK_MONOTONIC, &wakeup)) {
jbe@393 449 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 450 }
jbe@393 451 wakeup.tv_sec += n;
jbe@393 452 wakeup.tv_nsec += 1000000000 * (n - (time_t)n);
jbe@393 453 if (wakeup.tv_nsec >= 1000000000) {
jbe@393 454 wakeup.tv_sec += 1;
jbe@393 455 wakeup.tv_nsec -= 1000000000;
jbe@393 456 }
jbe@393 457 } else if (isnum && n==0) {
jbe@393 458 nonblock = 1;
jbe@393 459 } else {
jbe@393 460 luaL_argcheck(L, 0, 2, "not a valid timeout");
jbe@393 461 }
jbe@393 462 }
jbe@397 463 lua_settop(L, 1);
jbe@393 464 if (!nonblock) {
jbe@393 465 fd = PQsocket(conn->pgconn);
jbe@393 466 FD_ZERO(&fds);
jbe@393 467 FD_SET(fd, &fds);
jbe@393 468 }
jbe@393 469 while (true) {
jbe@393 470 {
jbe@393 471 PGnotify *notify;
jbe@393 472 if (!PQconsumeInput(conn->pgconn)) {
jbe@397 473 lua_newtable(L); // 2
jbe@397 474 lua_getfield(L,
jbe@397 475 LUA_REGISTRYINDEX,
jbe@397 476 MONDELEFANT_ERROROBJECT_MT_REGKEY
jbe@397 477 );
jbe@397 478 lua_setmetatable(L, 2);
jbe@397 479 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@397 480 lua_setfield(L, 2, "code");
jbe@397 481 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 3
jbe@397 482 lua_setfield(L, 2, "message");
jbe@397 483 return 1;
jbe@393 484 }
jbe@393 485 notify = PQnotifies(conn->pgconn);
jbe@393 486 if (notify) {
jbe@397 487 lua_pushnil(L);
jbe@393 488 lua_pushstring(L, notify->relname);
jbe@393 489 lua_pushstring(L, notify->extra);
jbe@393 490 lua_pushinteger(L, notify->be_pid);
jbe@393 491 PQfreemem(notify);
jbe@397 492 return 4;
jbe@393 493 }
jbe@393 494 }
jbe@393 495 if (infinite) {
jbe@393 496 select(fd+1, &fds, NULL, NULL, NULL);
jbe@393 497 } else if (nonblock) {
jbe@393 498 break;
jbe@393 499 } else {
jbe@393 500 struct timespec tp;
jbe@393 501 struct timeval timeout = { 0, };
jbe@393 502 if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
jbe@393 503 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 504 }
jbe@393 505 tp.tv_sec = wakeup.tv_sec - tp.tv_sec;
jbe@393 506 tp.tv_nsec = wakeup.tv_nsec - tp.tv_nsec;
jbe@393 507 if (tp.tv_nsec < 0) {
jbe@393 508 tp.tv_sec -= 1;
jbe@393 509 tp.tv_nsec += 1000000000;
jbe@393 510 }
jbe@393 511 timeout.tv_sec = tp.tv_sec;
jbe@393 512 timeout.tv_usec = (tp.tv_nsec + 500) / 1000;
jbe@393 513 if (
jbe@393 514 timeout.tv_sec < 0 ||
jbe@393 515 (timeout.tv_sec == 0 && timeout.tv_usec == 0)
jbe@393 516 ) break;
jbe@393 517 select(fd+1, &fds, NULL, NULL, &timeout);
jbe@393 518 }
jbe@393 519 }
jbe@397 520 lua_pushnil(L);
jbe@397 521 lua_pushnil(L);
jbe@393 522 return 2;
jbe@393 523 }
jbe@393 524
jbe@23 525 // method "create_list" of database handles:
jbe/bsw@0 526 static int mondelefant_conn_create_list(lua_State *L) {
jbe@23 527 // ensure that first argument is a database connection:
jbe/bsw@0 528 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 529 // if no second argument is given, use an empty table:
jbe@397 530 if (lua_isnoneornil(L, 2)) {
jbe@397 531 lua_settop(L, 1);
jbe@397 532 lua_newtable(L); // 2
jbe@397 533 } else {
jbe@397 534 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 535 lua_settop(L, 2);
jbe/bsw@0 536 }
jbe@23 537 // set meta-table for database result lists/objects:
jbe/bsw@0 538 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
jbe/bsw@0 539 lua_setmetatable(L, 2);
jbe@23 540 // set "_connection" attribute to self:
jbe/bsw@0 541 lua_pushvalue(L, 1); // 3
jbe/bsw@0 542 lua_setfield(L, 2, "_connection");
jbe@23 543 // set "_type" attribute to string "list":
jbe/bsw@0 544 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 545 lua_setfield(L, 2, "_type");
jbe@23 546 // return created database result list:
jbe/bsw@0 547 return 1;
jbe/bsw@0 548 }
jbe/bsw@0 549
jbe@23 550 // method "create_object" of database handles:
jbe/bsw@0 551 static int mondelefant_conn_create_object(lua_State *L) {
jbe@23 552 // ensure that first argument is a database connection:
jbe/bsw@0 553 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 554 // if no second argument is given, use an empty table:
jbe@397 555 if (lua_isnoneornil(L, 2)) {
jbe@397 556 lua_settop(L, 1);
jbe@397 557 lua_newtable(L); // 2
jbe@397 558 } else {
jbe@397 559 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 560 lua_settop(L, 2);
jbe/bsw@0 561 }
jbe@397 562 // set meta-table for database result lists/objects:
jbe/bsw@0 563 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
jbe/bsw@0 564 lua_setmetatable(L, 2);
jbe@23 565 // set "_connection" attribute to self:
jbe/bsw@0 566 lua_pushvalue(L, 1); // 3
jbe/bsw@0 567 lua_setfield(L, 2, "_connection");
jbe@23 568 // set "_type" attribute to string "object":
jbe/bsw@0 569 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 570 lua_setfield(L, 2, "_type"); // "object" or "list"
jbe@23 571 // create empty tables for "_data", "_dirty" and "_ref" attributes:
jbe/bsw@0 572 lua_newtable(L); // 3
jbe/bsw@0 573 lua_setfield(L, 2, "_data");
jbe/bsw@0 574 lua_newtable(L); // 3
jbe/bsw@0 575 lua_setfield(L, 2, "_dirty");
jbe/bsw@0 576 lua_newtable(L); // 3
jbe/bsw@0 577 lua_setfield(L, 2, "_ref"); // nil=no info, false=nil, else table
jbe@23 578 // return created database result object:
jbe/bsw@0 579 return 1;
jbe/bsw@0 580 }
jbe/bsw@0 581
jbe@23 582 // method "quote_string" of database handles:
jbe/bsw@0 583 static int mondelefant_conn_quote_string(lua_State *L) {
jbe/bsw@0 584 mondelefant_conn_t *conn;
jbe/bsw@0 585 const char *input;
jbe/bsw@0 586 size_t input_len;
jbe/bsw@0 587 char *output;
jbe/bsw@0 588 size_t output_len;
jbe@23 589 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 590 conn = mondelefant_get_conn(L, 1);
jbe@23 591 // get second argument, which must be a string:
jbe/bsw@0 592 input = luaL_checklstring(L, 2, &input_len);
jbe@23 593 // throw error, if string is too long:
jbe/bsw@0 594 if (input_len > (SIZE_MAX / sizeof(char) - 3) / 2) {
jbe/bsw@0 595 return luaL_error(L, "String to be escaped is too long.");
jbe/bsw@0 596 }
jbe@23 597 // allocate memory for quoted string:
jbe/bsw@0 598 output = malloc((2 * input_len + 3) * sizeof(char));
jbe/bsw@0 599 if (!output) {
jbe/bsw@0 600 return luaL_error(L, "Could not allocate memory for string quoting.");
jbe/bsw@0 601 }
jbe@23 602 // do escaping by calling PQescapeStringConn and enclosing result with
jbe@23 603 // single quotes:
jbe/bsw@0 604 output[0] = '\'';
jbe/bsw@0 605 output_len = PQescapeStringConn(
jbe/bsw@0 606 conn->pgconn, output + 1, input, input_len, NULL
jbe/bsw@0 607 );
jbe/bsw@0 608 output[output_len + 1] = '\'';
jbe/bsw@0 609 output[output_len + 2] = 0;
jbe@23 610 // create Lua string:
jbe/bsw@0 611 lua_pushlstring(L, output, output_len + 2);
jbe@23 612 // free allocated memory:
jbe/bsw@0 613 free(output);
jbe@23 614 // return Lua string:
jbe/bsw@0 615 return 1;
jbe/bsw@0 616 }
jbe/bsw@0 617
jbe@23 618 // method "quote_binary" of database handles:
jbe/bsw@0 619 static int mondelefant_conn_quote_binary(lua_State *L) {
jbe/bsw@0 620 mondelefant_conn_t *conn;
jbe/bsw@0 621 const char *input;
jbe/bsw@0 622 size_t input_len;
jbe/bsw@0 623 char *output;
jbe/bsw@0 624 size_t output_len;
jbe/bsw@0 625 luaL_Buffer buf;
jbe@23 626 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 627 conn = mondelefant_get_conn(L, 1);
jbe@23 628 // get second argument, which must be a string:
jbe/bsw@0 629 input = luaL_checklstring(L, 2, &input_len);
jbe@23 630 // call PQescapeByteaConn, which allocates memory itself:
jbe/bsw@0 631 output = (char *)PQescapeByteaConn(
jbe/bsw@0 632 conn->pgconn, (const unsigned char *)input, input_len, &output_len
jbe/bsw@0 633 );
jbe@23 634 // if PQescapeByteaConn returned NULL, then throw error:
jbe/bsw@0 635 if (!output) {
jbe/bsw@0 636 return luaL_error(L, "Could not allocate memory for binary quoting.");
jbe/bsw@0 637 }
jbe@23 638 // create Lua string enclosed by single quotes:
jbe/bsw@0 639 luaL_buffinit(L, &buf);
jbe/bsw@0 640 luaL_addchar(&buf, '\'');
jbe/bsw@0 641 luaL_addlstring(&buf, output, output_len - 1);
jbe/bsw@0 642 luaL_addchar(&buf, '\'');
jbe/bsw@0 643 luaL_pushresult(&buf);
jbe@23 644 // free memory allocated by PQescapeByteaConn:
jbe/bsw@0 645 PQfreemem(output);
jbe@23 646 // return Lua string:
jbe/bsw@0 647 return 1;
jbe/bsw@0 648 }
jbe/bsw@0 649
jbe@23 650 // method "assemble_command" of database handles:
jbe/bsw@0 651 static int mondelefant_conn_assemble_command(lua_State *L) {
jbe/bsw@0 652 mondelefant_conn_t *conn;
jbe/bsw@0 653 int paramidx = 2;
jbe/bsw@0 654 const char *template;
jbe/bsw@0 655 size_t template_pos = 0;
jbe/bsw@0 656 luaL_Buffer buf;
jbe@23 657 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 658 conn = mondelefant_get_conn(L, 1);
jbe@23 659 // if second argument is a string, return this string:
jbe@397 660 if (lua_type(L, 2) == LUA_TSTRING) {
jbe@397 661 lua_settop(L, 2);
jbe/bsw@0 662 return 1;
jbe/bsw@0 663 }
jbe@23 664 // if second argument has __tostring meta-method,
jbe@23 665 // then use this method and return its result:
jbe/bsw@0 666 if (luaL_callmeta(L, 2, "__tostring")) return 1;
jbe@23 667 // otherwise, require that second argument is a table:
jbe/bsw@0 668 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 669 // set stack top:
jbe@397 670 lua_settop(L, 2);
jbe@23 671 // get first element of table, which must be a string:
jbe/bsw@0 672 lua_rawgeti(L, 2, 1); // 3
jbe/bsw@0 673 luaL_argcheck(L,
jbe/bsw@0 674 lua_isstring(L, 3),
jbe/bsw@0 675 2,
jbe/bsw@0 676 "First entry of SQL command structure is not a string."
jbe/bsw@0 677 );
jbe/bsw@0 678 template = lua_tostring(L, 3);
jbe@23 679 // get value of "input_converter" attribute of database connection:
jbe/bsw@0 680 lua_pushliteral(L, "input_converter"); // 4
jbe/bsw@0 681 lua_gettable(L, 1); // input_converter at stack position 4
jbe@23 682 // reserve space on Lua stack:
jbe/bsw@0 683 lua_pushnil(L); // free space at stack position 5
jbe/bsw@0 684 lua_pushnil(L); // free space at stack position 6
jbe@23 685 // initialize Lua buffer for result string:
jbe/bsw@0 686 luaL_buffinit(L, &buf);
jbe@23 687 // fill buffer in loop:
jbe/bsw@0 688 while (1) {
jbe@23 689 // variable declaration:
jbe/bsw@0 690 char c;
jbe@23 691 // get next character:
jbe/bsw@0 692 c = template[template_pos++];
jbe@23 693 // break, when character is NULL byte:
jbe/bsw@0 694 if (!c) break;
jbe@23 695 // question-mark and dollar-sign are special characters:
jbe@23 696 if (c == '?' || c == '$') { // special character found
jbe@23 697 // check, if same character follows:
jbe@23 698 if (template[template_pos] == c) { // special character is escaped
jbe@23 699 // consume two characters of input and add one character to buffer:
jbe/bsw@0 700 template_pos++;
jbe/bsw@0 701 luaL_addchar(&buf, c);
jbe@23 702 } else { // special character is not escaped
jbe/bsw@0 703 luaL_Buffer keybuf;
jbe/bsw@0 704 int subcmd;
jbe@23 705 // set 'subcmd' = true, if special character was a dollar-sign,
jbe@23 706 // set 'subcmd' = false, if special character was a question-mark:
jbe/bsw@0 707 subcmd = (c == '$');
jbe@23 708 // read any number of alpha numeric chars or underscores
jbe@23 709 // and store them on Lua stack:
jbe/bsw@0 710 luaL_buffinit(L, &keybuf);
jbe/bsw@0 711 while (1) {
jbe/bsw@0 712 c = template[template_pos];
jbe/bsw@0 713 if (
jbe/bsw@0 714 (c < 'A' || c > 'Z') &&
jbe/bsw@0 715 (c < 'a' || c > 'z') &&
jbe/bsw@0 716 (c < '0' || c > '9') &&
jbe/bsw@0 717 (c != '_')
jbe/bsw@0 718 ) break;
jbe/bsw@0 719 luaL_addchar(&keybuf, c);
jbe/bsw@0 720 template_pos++;
jbe/bsw@0 721 }
jbe/bsw@0 722 luaL_pushresult(&keybuf);
jbe@23 723 // check, if any characters matched:
jbe@64 724 if (lua_rawlen(L, -1)) {
jbe@23 725 // if any alpha numeric chars or underscores were found,
jbe@23 726 // push them on stack as a Lua string and use them to lookup
jbe@23 727 // value from second argument:
jbe/bsw@0 728 lua_pushvalue(L, -1); // save key on stack
jbe@23 729 lua_gettable(L, 2); // fetch value (raw-value)
jbe/bsw@0 730 } else {
jbe@23 731 // otherwise push nil and use numeric lookup based on 'paramidx':
jbe/bsw@0 732 lua_pop(L, 1);
jbe/bsw@0 733 lua_pushnil(L); // put nil on key position
jbe@23 734 lua_rawgeti(L, 2, paramidx++); // fetch value (raw-value)
jbe/bsw@0 735 }
jbe@23 736 // Lua stack contains: ..., <buffer>, key, raw-value
jbe@23 737 // branch according to type of special character ("?" or "$"):
jbe@23 738 if (subcmd) { // dollar-sign
jbe/bsw@0 739 size_t i;
jbe/bsw@0 740 size_t count;
jbe@23 741 // store fetched value (which is supposed to be sub-structure)
jbe@23 742 // on Lua stack position 5 and drop key:
jbe@23 743 lua_replace(L, 5);
jbe@23 744 lua_pop(L, 1);
jbe@23 745 // Lua stack contains: ..., <buffer>
jbe@23 746 // check, if fetched value is really a sub-structure:
jbe/bsw@0 747 luaL_argcheck(L,
jbe/bsw@0 748 !lua_isnil(L, 5),
jbe/bsw@0 749 2,
jbe/bsw@0 750 "SQL sub-structure not found."
jbe/bsw@0 751 );
jbe/bsw@0 752 luaL_argcheck(L,
jbe/bsw@0 753 lua_type(L, 5) == LUA_TTABLE,
jbe/bsw@0 754 2,
jbe/bsw@0 755 "SQL sub-structure must be a table."
jbe/bsw@0 756 );
jbe@23 757 // Lua stack contains: ..., <buffer>
jbe@23 758 // get value of "sep" attribute of sub-structure,
jbe@23 759 // and place it on Lua stack position 6:
jbe/bsw@0 760 lua_getfield(L, 5, "sep");
jbe@23 761 lua_replace(L, 6);
jbe@23 762 // if seperator is nil, then use ", " as default,
jbe@23 763 // if seperator is neither nil nor a string, then throw error:
jbe/bsw@0 764 if (lua_isnil(L, 6)) {
jbe/bsw@0 765 lua_pushstring(L, ", ");
jbe/bsw@0 766 lua_replace(L, 6);
jbe/bsw@0 767 } else {
jbe/bsw@0 768 luaL_argcheck(L,
jbe/bsw@0 769 lua_isstring(L, 6),
jbe/bsw@0 770 2,
jbe/bsw@0 771 "Seperator of SQL sub-structure has to be a string."
jbe/bsw@0 772 );
jbe/bsw@0 773 }
jbe@23 774 // iterate over items of sub-structure:
jbe@64 775 count = lua_rawlen(L, 5);
jbe/bsw@0 776 for (i = 0; i < count; i++) {
jbe@23 777 // add seperator, unless this is the first run:
jbe/bsw@0 778 if (i) {
jbe/bsw@0 779 lua_pushvalue(L, 6);
jbe/bsw@0 780 luaL_addvalue(&buf);
jbe/bsw@0 781 }
jbe@23 782 // recursivly apply assemble function and add results to buffer:
jbe/bsw@0 783 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 784 lua_pushvalue(L, 1);
jbe/bsw@0 785 lua_rawgeti(L, 5, i+1);
jbe/bsw@0 786 lua_call(L, 2, 1);
jbe/bsw@0 787 luaL_addvalue(&buf);
jbe/bsw@0 788 }
jbe@23 789 } else { // question-mark
jbe/bsw@0 790 if (lua_toboolean(L, 4)) {
jbe@23 791 // call input_converter with connection handle, raw-value and
jbe@23 792 // an info-table which contains a "field_name" entry with the
jbe@23 793 // used key:
jbe/bsw@0 794 lua_pushvalue(L, 4);
jbe/bsw@0 795 lua_pushvalue(L, 1);
jbe/bsw@0 796 lua_pushvalue(L, -3);
jbe/bsw@0 797 lua_newtable(L);
jbe/bsw@0 798 lua_pushvalue(L, -6);
jbe/bsw@0 799 lua_setfield(L, -2, "field_name");
jbe/bsw@0 800 lua_call(L, 3, 1);
jbe@23 801 // Lua stack contains: ..., <buffer>, key, raw-value, final-value
jbe@23 802 // remove key and raw-value:
jbe/bsw@0 803 lua_remove(L, -2);
jbe/bsw@0 804 lua_remove(L, -2);
jbe@23 805 // Lua stack contains: ..., <buffer>, final-value
jbe@23 806 // throw error, if final-value is not a string:
jbe/bsw@0 807 if (!lua_isstring(L, -1)) {
jbe/bsw@0 808 return luaL_error(L, "input_converter returned non-string.");
jbe/bsw@0 809 }
jbe/bsw@0 810 } else {
jbe@23 811 // remove key from stack:
jbe/bsw@0 812 lua_remove(L, -2);
jbe@23 813 // Lua stack contains: ..., <buffer>, raw-value
jbe@23 814 // branch according to type of value:
jbe@23 815 if (lua_isnil(L, -1)) { // value is nil
jbe@23 816 // push string "NULL" to stack:
jbe/bsw@0 817 lua_pushliteral(L, "NULL");
jbe@23 818 } else if (lua_type(L, -1) == LUA_TBOOLEAN) { // value is boolean
jbe@23 819 // push strings "TRUE" or "FALSE" to stack:
jbe/bsw@0 820 lua_pushstring(L, lua_toboolean(L, -1) ? "TRUE" : "FALSE");
jbe@23 821 } else if (lua_isstring(L, -1)) { // value is string or number
jbe/bsw@0 822 // NOTE: In this version of lua a number will be converted
jbe@23 823 // push output of "quote_string" method of database
jbe@23 824 // connection to stack:
jbe/bsw@0 825 lua_tostring(L, -1);
jbe/bsw@0 826 lua_pushcfunction(L, mondelefant_conn_quote_string);
jbe/bsw@0 827 lua_pushvalue(L, 1);
jbe/bsw@0 828 lua_pushvalue(L, -3);
jbe/bsw@0 829 lua_call(L, 2, 1);
jbe@23 830 } else { // value is of other type
jbe@23 831 // throw error:
jbe/bsw@0 832 return luaL_error(L,
jbe/bsw@0 833 "Unable to convert SQL value due to unknown type "
jbe/bsw@0 834 "or missing input_converter."
jbe/bsw@0 835 );
jbe/bsw@0 836 }
jbe@23 837 // Lua stack contains: ..., <buffer>, raw-value, final-value
jbe@23 838 // remove raw-value:
jbe/bsw@0 839 lua_remove(L, -2);
jbe@23 840 // Lua stack contains: ..., <buffer>, final-value
jbe/bsw@0 841 }
jbe@23 842 // append final-value to buffer:
jbe/bsw@0 843 luaL_addvalue(&buf);
jbe/bsw@0 844 }
jbe/bsw@0 845 }
jbe@23 846 } else { // character is not special
jbe@23 847 // just copy character:
jbe/bsw@0 848 luaL_addchar(&buf, c);
jbe/bsw@0 849 }
jbe/bsw@0 850 }
jbe@23 851 // return string in buffer:
jbe/bsw@0 852 luaL_pushresult(&buf);
jbe/bsw@0 853 return 1;
jbe/bsw@0 854 }
jbe/bsw@0 855
jbe@23 856 // max number of SQL statements executed by one "query" method call:
jbe/bsw@0 857 #define MONDELEFANT_MAX_COMMAND_COUNT 64
jbe@23 858 // max number of columns in a database result:
jbe/bsw@0 859 #define MONDELEFANT_MAX_COLUMN_COUNT 1024
jbe@23 860 // enum values for 'modes' array in C-function below:
jbe/bsw@0 861 #define MONDELEFANT_QUERY_MODE_LIST 1
jbe/bsw@0 862 #define MONDELEFANT_QUERY_MODE_OBJECT 2
jbe/bsw@0 863 #define MONDELEFANT_QUERY_MODE_OPT_OBJECT 3
jbe/bsw@0 864
jbe@23 865 // method "try_query" of database handles:
jbe/bsw@0 866 static int mondelefant_conn_try_query(lua_State *L) {
jbe/bsw@0 867 mondelefant_conn_t *conn;
jbe/bsw@0 868 int command_count;
jbe/bsw@0 869 int command_idx;
jbe/bsw@0 870 int modes[MONDELEFANT_MAX_COMMAND_COUNT];
jbe/bsw@0 871 luaL_Buffer buf;
jbe/bsw@0 872 int sent_success;
jbe/bsw@0 873 PGresult *res;
jbe/bsw@0 874 int rows, cols, row, col;
jbe@23 875 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 876 conn = mondelefant_get_conn(L, 1);
jbe@23 877 // calculate number of commands (2 arguments for one command):
jbe/bsw@0 878 command_count = lua_gettop(L) / 2;
jbe@23 879 // push nil on stack, which is needed, if last mode was ommitted:
jbe@23 880 lua_pushnil(L);
jbe@23 881 // throw error, if number of commands is too high:
jbe/bsw@0 882 if (command_count > MONDELEFANT_MAX_COMMAND_COUNT) {
jbe/bsw@0 883 return luaL_error(L, "Exceeded maximum command count in one query.");
jbe/bsw@0 884 }
jbe@23 885 // create SQL string, store query modes and push SQL string on stack:
jbe/bsw@0 886 luaL_buffinit(L, &buf);
jbe/bsw@0 887 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 888 int mode;
jbe/bsw@0 889 int mode_idx; // stack index of mode string
jbe/bsw@0 890 if (command_idx) luaL_addchar(&buf, ' ');
jbe/bsw@0 891 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 892 lua_pushvalue(L, 1);
jbe/bsw@0 893 lua_pushvalue(L, 2 + 2 * command_idx);
jbe/bsw@0 894 lua_call(L, 2, 1);
jbe/bsw@0 895 luaL_addvalue(&buf);
jbe/bsw@0 896 luaL_addchar(&buf, ';');
jbe/bsw@0 897 mode_idx = 3 + 2 * command_idx;
jbe/bsw@0 898 if (lua_isnil(L, mode_idx)) {
jbe/bsw@0 899 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 900 } else {
jbe/bsw@0 901 const char *modestr;
jbe/bsw@0 902 modestr = luaL_checkstring(L, mode_idx);
jbe/bsw@0 903 if (!strcmp(modestr, "list")) {
jbe/bsw@0 904 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 905 } else if (!strcmp(modestr, "object")) {
jbe/bsw@0 906 mode = MONDELEFANT_QUERY_MODE_OBJECT;
jbe/bsw@0 907 } else if (!strcmp(modestr, "opt_object")) {
jbe/bsw@0 908 mode = MONDELEFANT_QUERY_MODE_OPT_OBJECT;
jbe/bsw@0 909 } else {
jbe@397 910 return luaL_argerror(L, mode_idx, "unknown query mode");
jbe/bsw@0 911 }
jbe/bsw@0 912 }
jbe/bsw@0 913 modes[command_idx] = mode;
jbe/bsw@0 914 }
jbe/bsw@0 915 luaL_pushresult(&buf); // stack position unknown
jbe/bsw@0 916 lua_replace(L, 2); // SQL command string to stack position 2
jbe@23 917 // call sql_tracer, if set:
jbe/bsw@0 918 lua_settop(L, 2);
jbe/bsw@0 919 lua_getfield(L, 1, "sql_tracer"); // tracer at stack position 3
jbe/bsw@0 920 if (lua_toboolean(L, 3)) {
jbe/bsw@0 921 lua_pushvalue(L, 1); // 4
jbe/bsw@0 922 lua_pushvalue(L, 2); // 5
jbe/bsw@0 923 lua_call(L, 2, 1); // trace callback at stack position 3
jbe/bsw@0 924 }
jbe@23 925 // NOTE: If no tracer was found, then nil or false is stored at stack
jbe@23 926 // position 3.
jbe@23 927 // call PQsendQuery function and store result in 'sent_success' variable:
jbe/bsw@0 928 sent_success = PQsendQuery(conn->pgconn, lua_tostring(L, 2));
jbe@23 929 // create preliminary result table:
jbe/bsw@0 930 lua_newtable(L); // results in table at stack position 4
jbe@23 931 // iterate over results using function PQgetResult to fill result table:
jbe/bsw@0 932 for (command_idx = 0; ; command_idx++) {
jbe/bsw@0 933 int mode;
jbe/bsw@0 934 char binary[MONDELEFANT_MAX_COLUMN_COUNT];
jbe/bsw@0 935 ExecStatusType pgstatus;
jbe@23 936 // fetch mode which was given for the command:
jbe/bsw@0 937 mode = modes[command_idx];
jbe@23 938 // if PQsendQuery call was successful, then fetch result data:
jbe/bsw@0 939 if (sent_success) {
jbe@23 940 // NOTE: PQgetResult called one extra time. Break only, if all
jbe@23 941 // queries have been processed and PQgetResult returned NULL.
jbe/bsw@0 942 res = PQgetResult(conn->pgconn);
jbe/bsw@0 943 if (command_idx >= command_count && !res) break;
jbe/bsw@0 944 if (res) {
jbe/bsw@0 945 pgstatus = PQresultStatus(res);
jbe/bsw@0 946 rows = PQntuples(res);
jbe/bsw@0 947 cols = PQnfields(res);
jbe/bsw@0 948 }
jbe/bsw@0 949 }
jbe@23 950 // handle errors:
jbe/bsw@0 951 if (
jbe/bsw@0 952 !sent_success || command_idx >= command_count || !res ||
jbe/bsw@0 953 (pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK) ||
jbe/bsw@0 954 (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) ||
jbe/bsw@0 955 (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST)
jbe/bsw@0 956 ) {
jbe/bsw@0 957 const char *command;
jbe/bsw@0 958 command = lua_tostring(L, 2);
jbe/bsw@0 959 lua_newtable(L); // 5
jbe/bsw@0 960 lua_getfield(L,
jbe/bsw@0 961 LUA_REGISTRYINDEX,
jbe/bsw@0 962 MONDELEFANT_ERROROBJECT_MT_REGKEY
jbe/bsw@0 963 );
jbe/bsw@0 964 lua_setmetatable(L, 5);
jbe/bsw@0 965 lua_pushvalue(L, 1);
jbe/bsw@0 966 lua_setfield(L, 5, "connection");
jbe/bsw@0 967 lua_pushvalue(L, 2);
jbe/bsw@0 968 lua_setfield(L, 5, "sql_command");
jbe@397 969 if (!sent_success) {
jbe@397 970 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe/bsw@0 971 lua_setfield(L, 5, "code");
jbe@397 972 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn));
jbe/bsw@0 973 lua_setfield(L, 5, "message");
jbe/bsw@0 974 } else {
jbe@397 975 lua_pushinteger(L, command_idx + 1);
jbe@397 976 lua_setfield(L, 5, "command_number");
jbe@397 977 if (!res) {
jbe@397 978 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_LOW);
jbe@397 979 lua_setfield(L, 5, "code");
jbe@397 980 lua_pushliteral(L, "Received too few database result sets.");
jbe@397 981 lua_setfield(L, 5, "message");
jbe@397 982 } else if (command_idx >= command_count) {
jbe@397 983 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH);
jbe@397 984 lua_setfield(L, 5, "code");
jbe@397 985 lua_pushliteral(L, "Received too many database result sets.");
jbe@397 986 lua_setfield(L, 5, "message");
jbe@397 987 } else if (
jbe@397 988 pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK
jbe@397 989 ) {
jbe@397 990 const char *sqlstate;
jbe@397 991 const char *errmsg;
jbe@397 992 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SEVERITY));
jbe@397 993 lua_setfield(L, 5, "pg_severity");
jbe@397 994 sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
jbe@397 995 if (sqlstate) {
jbe@397 996 lua_pushstring(L, sqlstate);
jbe@397 997 lua_setfield(L, 5, "pg_sqlstate");
jbe@397 998 lua_pushstring(L, mondelefant_translate_errcode(sqlstate));
jbe@397 999 lua_setfield(L, 5, "code");
jbe@397 1000 } else {
jbe@397 1001 lua_pushliteral(L, MONDELEFANT_ERRCODE_UNKNOWN);
jbe@397 1002 lua_setfield(L, 5, "code");
jbe@397 1003 }
jbe@397 1004 errmsg = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
jbe@397 1005 if (errmsg) {
jbe@397 1006 mondelefant_push_first_line(L, errmsg);
jbe@397 1007 lua_setfield(L, 5, "message");
jbe@397 1008 lua_pushstring(L, errmsg);
jbe@397 1009 lua_setfield(L, 5, "pg_message_primary");
jbe@397 1010 } else {
jbe@397 1011 lua_pushliteral(L,
jbe@397 1012 "Error while fetching result, but no error message given."
jbe@397 1013 );
jbe@397 1014 lua_setfield(L, 5, "message");
jbe@397 1015 }
jbe@397 1016 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL));
jbe@397 1017 lua_setfield(L, 5, "pg_message_detail");
jbe@397 1018 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_HINT));
jbe@397 1019 lua_setfield(L, 5, "pg_message_hint");
jbe@397 1020 // NOTE: "position" and "pg_internal_position" are recalculated to
jbe@397 1021 // byte offsets, as Lua 5.2 is not Unicode aware.
jbe@397 1022 {
jbe@397 1023 char *tmp;
jbe@397 1024 tmp = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
jbe@397 1025 if (tmp) {
jbe@397 1026 int pos;
jbe@397 1027 pos = atoi(tmp) - 1;
jbe@397 1028 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1029 pos = utf8_position_to_byte(command, pos);
jbe@397 1030 }
jbe@397 1031 lua_pushinteger(L, pos + 1);
jbe@397 1032 lua_setfield(L, 5, "position");
jbe@397 1033 }
jbe@397 1034 }
jbe@397 1035 {
jbe@397 1036 const char *internal_query;
jbe@397 1037 internal_query = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
jbe@397 1038 lua_pushstring(L, internal_query);
jbe@397 1039 lua_setfield(L, 5, "pg_internal_query");
jbe@397 1040 char *tmp;
jbe@397 1041 tmp = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
jbe@397 1042 if (tmp) {
jbe@397 1043 int pos;
jbe@397 1044 pos = atoi(tmp) - 1;
jbe@397 1045 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1046 pos = utf8_position_to_byte(internal_query, pos);
jbe@397 1047 }
jbe@397 1048 lua_pushinteger(L, pos + 1);
jbe@397 1049 lua_setfield(L, 5, "pg_internal_position");
jbe@397 1050 }
jbe@397 1051 }
jbe@397 1052 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_CONTEXT));
jbe@397 1053 lua_setfield(L, 5, "pg_context");
jbe@397 1054 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FILE));
jbe@397 1055 lua_setfield(L, 5, "pg_source_file");
jbe@397 1056 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_LINE));
jbe@397 1057 lua_setfield(L, 5, "pg_source_line");
jbe@397 1058 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION));
jbe@397 1059 lua_setfield(L, 5, "pg_source_function");
jbe@397 1060 } else if (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) {
jbe@397 1061 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_NO_ROWS);
jbe@397 1062 lua_setfield(L, 5, "code");
jbe@397 1063 lua_pushliteral(L, "Expected one row, but got empty set.");
jbe@397 1064 lua_setfield(L, 5, "message");
jbe@397 1065 } else if (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST) {
jbe@397 1066 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS);
jbe@397 1067 lua_setfield(L, 5, "code");
jbe@397 1068 lua_pushliteral(L, "Got more than one result row.");
jbe@397 1069 lua_setfield(L, 5, "message");
jbe@397 1070 } else {
jbe@397 1071 // should not happen
jbe@397 1072 abort();
jbe@397 1073 }
jbe@397 1074 if (res) {
jbe@397 1075 PQclear(res);
jbe@397 1076 while ((res = PQgetResult(conn->pgconn))) PQclear(res);
jbe@397 1077 }
jbe/bsw@0 1078 }
jbe/bsw@0 1079 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1080 lua_pushvalue(L, 3);
jbe/bsw@0 1081 lua_pushvalue(L, 5);
jbe/bsw@0 1082 lua_call(L, 1, 0);
jbe/bsw@0 1083 }
jbe/bsw@0 1084 return 1;
jbe/bsw@0 1085 }
jbe@23 1086 // call "create_list" or "create_object" method of database handle,
jbe@23 1087 // result will be at stack position 5:
jbe/bsw@0 1088 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1089 lua_pushcfunction(L, mondelefant_conn_create_list); // 5
jbe/bsw@0 1090 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1091 lua_call(L, 1, 1); // 5
jbe/bsw@0 1092 } else {
jbe/bsw@0 1093 lua_pushcfunction(L, mondelefant_conn_create_object); // 5
jbe/bsw@0 1094 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1095 lua_call(L, 1, 1); // 5
jbe/bsw@0 1096 }
jbe@23 1097 // set "_column_info":
jbe@23 1098 lua_newtable(L); // 6
jbe/bsw@0 1099 for (col = 0; col < cols; col++) {
jbe/bsw@0 1100 lua_newtable(L); // 7
jbe@380 1101 lua_pushstring(L, PQfname(res, col)); // 8
jbe@380 1102 lua_pushvalue(L, 8); // 9
jbe@380 1103 lua_pushvalue(L, 7); // 10
jbe@380 1104 lua_rawset(L, 6);
jbe/bsw@0 1105 lua_setfield(L, 7, "field_name");
jbe@380 1106 // _column_info entry (for current column) on stack position 7
jbe/bsw@0 1107 {
jbe/bsw@0 1108 Oid tmp;
jbe/bsw@0 1109 tmp = PQftable(res, col);
jbe/bsw@0 1110 if (tmp == InvalidOid) lua_pushnil(L);
jbe/bsw@0 1111 else lua_pushinteger(L, tmp);
jbe/bsw@0 1112 lua_setfield(L, 7, "table_oid");
jbe/bsw@0 1113 }
jbe/bsw@0 1114 {
jbe/bsw@0 1115 int tmp;
jbe/bsw@0 1116 tmp = PQftablecol(res, col);
jbe/bsw@0 1117 if (tmp == 0) lua_pushnil(L);
jbe/bsw@0 1118 else lua_pushinteger(L, tmp);
jbe/bsw@0 1119 lua_setfield(L, 7, "table_column_number");
jbe/bsw@0 1120 }
jbe/bsw@0 1121 {
jbe/bsw@0 1122 Oid tmp;
jbe/bsw@0 1123 tmp = PQftype(res, col);
jbe/bsw@0 1124 binary[col] = (tmp == MONDELEFANT_POSTGRESQL_BINARY_OID);
jbe/bsw@0 1125 lua_pushinteger(L, tmp);
jbe/bsw@0 1126 lua_setfield(L, 7, "type_oid");
jbe/bsw@0 1127 lua_pushstring(L, mondelefant_oid_to_typestr(tmp));
jbe/bsw@0 1128 lua_setfield(L, 7, "type");
jbe/bsw@0 1129 }
jbe/bsw@0 1130 {
jbe/bsw@0 1131 int tmp;
jbe/bsw@0 1132 tmp = PQfmod(res, col);
jbe/bsw@0 1133 if (tmp == -1) lua_pushnil(L);
jbe/bsw@0 1134 else lua_pushinteger(L, tmp);
jbe/bsw@0 1135 lua_setfield(L, 7, "type_modifier");
jbe/bsw@0 1136 }
jbe/bsw@0 1137 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1138 }
jbe@23 1139 lua_setfield(L, 5, "_column_info");
jbe@23 1140 // set "_rows_affected":
jbe/bsw@0 1141 {
jbe/bsw@0 1142 char *tmp;
jbe/bsw@0 1143 tmp = PQcmdTuples(res);
jbe/bsw@0 1144 if (tmp[0]) {
jbe/bsw@0 1145 lua_pushinteger(L, atoi(tmp));
jbe/bsw@0 1146 lua_setfield(L, 5, "_rows_affected");
jbe/bsw@0 1147 }
jbe/bsw@0 1148 }
jbe@23 1149 // set "_oid":
jbe/bsw@0 1150 {
jbe/bsw@0 1151 Oid tmp;
jbe/bsw@0 1152 tmp = PQoidValue(res);
jbe/bsw@0 1153 if (tmp != InvalidOid) {
jbe/bsw@0 1154 lua_pushinteger(L, tmp);
jbe/bsw@0 1155 lua_setfield(L, 5, "_oid");
jbe/bsw@0 1156 }
jbe/bsw@0 1157 }
jbe@23 1158 // copy data as strings or nil, while performing binary unescaping
jbe@23 1159 // automatically:
jbe/bsw@0 1160 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1161 for (row = 0; row < rows; row++) {
jbe/bsw@0 1162 lua_pushcfunction(L, mondelefant_conn_create_object); // 6
jbe/bsw@0 1163 lua_pushvalue(L, 1); // 7
jbe/bsw@0 1164 lua_call(L, 1, 1); // 6
jbe/bsw@0 1165 for (col = 0; col < cols; col++) {
jbe/bsw@0 1166 if (PQgetisnull(res, row, col)) {
jbe/bsw@0 1167 lua_pushnil(L);
jbe/bsw@0 1168 } else if (binary[col]) {
jbe/bsw@0 1169 size_t binlen;
jbe/bsw@0 1170 char *binval;
jbe/bsw@0 1171 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1172 (unsigned char *)PQgetvalue(res, row, col), &binlen
jbe/bsw@0 1173 );
jbe/bsw@0 1174 if (!binval) {
jbe/bsw@0 1175 return luaL_error(L,
jbe/bsw@0 1176 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1177 );
jbe/bsw@0 1178 }
jbe/bsw@0 1179 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1180 PQfreemem(binval);
jbe/bsw@0 1181 } else {
jbe/bsw@0 1182 lua_pushstring(L, PQgetvalue(res, row, col));
jbe/bsw@0 1183 }
jbe/bsw@0 1184 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1185 }
jbe/bsw@0 1186 lua_rawseti(L, 5, row+1);
jbe/bsw@0 1187 }
jbe/bsw@0 1188 } else if (rows == 1) {
jbe/bsw@0 1189 for (col = 0; col < cols; col++) {
jbe/bsw@0 1190 if (PQgetisnull(res, 0, col)) {
jbe/bsw@0 1191 lua_pushnil(L);
jbe/bsw@0 1192 } else if (binary[col]) {
jbe/bsw@0 1193 size_t binlen;
jbe/bsw@0 1194 char *binval;
jbe/bsw@0 1195 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1196 (unsigned char *)PQgetvalue(res, 0, col), &binlen
jbe/bsw@0 1197 );
jbe/bsw@0 1198 if (!binval) {
jbe/bsw@0 1199 return luaL_error(L,
jbe/bsw@0 1200 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1201 );
jbe/bsw@0 1202 }
jbe/bsw@0 1203 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1204 PQfreemem(binval);
jbe/bsw@0 1205 } else {
jbe/bsw@0 1206 lua_pushstring(L, PQgetvalue(res, 0, col));
jbe/bsw@0 1207 }
jbe/bsw@0 1208 lua_rawseti(L, 5, col+1);
jbe/bsw@0 1209 }
jbe/bsw@0 1210 } else {
jbe/bsw@0 1211 // no row in optrow mode
jbe/bsw@0 1212 lua_pop(L, 1);
jbe/bsw@0 1213 lua_pushnil(L);
jbe/bsw@0 1214 }
jbe@23 1215 // save result in result list:
jbe/bsw@0 1216 lua_rawseti(L, 4, command_idx+1);
jbe@23 1217 // extra assertion:
jbe/bsw@0 1218 if (lua_gettop(L) != 4) abort(); // should not happen
jbe@23 1219 // free memory acquired by libpq:
jbe/bsw@0 1220 PQclear(res);
jbe/bsw@0 1221 }
jbe/bsw@0 1222 // trace callback at stack position 3
jbe/bsw@0 1223 // result at stack position 4 (top of stack)
jbe@23 1224 // if a trace callback is existent, then call:
jbe/bsw@0 1225 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1226 lua_pushvalue(L, 3);
jbe/bsw@0 1227 lua_call(L, 0, 0);
jbe/bsw@0 1228 }
jbe@23 1229 // put result at stack position 3:
jbe@23 1230 lua_replace(L, 3);
jbe@23 1231 // get output converter to stack position 4:
jbe@23 1232 lua_getfield(L, 1, "output_converter");
jbe@374 1233 // get mutability state saver to stack position 5:
jbe@375 1234 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe@375 1235 lua_getfield(L, -1, "save_mutability_state");
jbe@375 1236 lua_replace(L, -2);
jbe@23 1237 // apply output converters and fill "_data" table according to column names:
jbe/bsw@0 1238 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1239 int mode;
jbe/bsw@0 1240 mode = modes[command_idx];
jbe@374 1241 lua_rawgeti(L, 3, command_idx+1); // raw result at stack position 6
jbe@374 1242 if (lua_toboolean(L, 6)) {
jbe@374 1243 lua_getfield(L, 6, "_column_info"); // column_info list at position 7
jbe@374 1244 cols = lua_rawlen(L, 7);
jbe/bsw@0 1245 if (mode == MONDELEFANT_QUERY_MODE_LIST) {
jbe@374 1246 rows = lua_rawlen(L, 6);
jbe/bsw@0 1247 for (row = 0; row < rows; row++) {
jbe@374 1248 lua_rawgeti(L, 6, row+1); // row at stack position 8
jbe@374 1249 lua_getfield(L, 8, "_data"); // _data table at stack position 9
jbe@375 1250 lua_getfield(L, 8, "_dirty"); // _dirty table at stack position 10
jbe/bsw@0 1251 for (col = 0; col < cols; col++) {
jbe@375 1252 lua_rawgeti(L, 7, col+1); // this column info at position 11
jbe@375 1253 lua_getfield(L, 11, "field_name"); // 12
jbe/bsw@0 1254 if (lua_toboolean(L, 4)) {
jbe/bsw@0 1255 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0 1256 lua_pushvalue(L, 1); // connection
jbe@374 1257 lua_rawgeti(L, 8, col+1); // raw-value
jbe@375 1258 lua_pushvalue(L, 11); // this column info
jbe@375 1259 lua_call(L, 3, 1); // converted value at position 13
jbe/bsw@0 1260 } else {
jbe@375 1261 lua_rawgeti(L, 8, col+1); // raw-value at position 13
jbe/bsw@0 1262 }
jbe@375 1263 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375 1264 lua_pushvalue(L, 12); // copy of field name
jbe@375 1265 lua_pushvalue(L, 5); // mutability state saver function
jbe@375 1266 lua_pushvalue(L, 13); // copy of value
jbe@375 1267 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375 1268 lua_rawset(L, 10); // store mutability state in _dirty table
jbe@375 1269 }
jbe@375 1270 lua_pushvalue(L, 13); // 14
jbe@374 1271 lua_rawseti(L, 8, col+1);
jbe@374 1272 lua_rawset(L, 9);
jbe@399 1273 lua_settop(L, 10);
jbe/bsw@0 1274 }
jbe@374 1275 lua_settop(L, 7);
jbe/bsw@0 1276 }
jbe/bsw@0 1277 } else {
jbe@374 1278 lua_getfield(L, 6, "_data"); // _data table at stack position 8
jbe@375 1279 lua_getfield(L, 6, "_dirty"); // _dirty table at stack position 9
jbe/bsw@0 1280 for (col = 0; col < cols; col++) {
jbe@375 1281 lua_rawgeti(L, 7, col+1); // this column info at position 10
jbe@375 1282 lua_getfield(L, 10, "field_name"); // 11
jbe/bsw@0 1283 if (lua_toboolean(L, 4)) {
jbe/bsw@0 1284 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0 1285 lua_pushvalue(L, 1); // connection
jbe@374 1286 lua_rawgeti(L, 6, col+1); // raw-value
jbe@375 1287 lua_pushvalue(L, 10); // this column info
jbe@375 1288 lua_call(L, 3, 1); // converted value at position 12
jbe/bsw@0 1289 } else {
jbe@375 1290 lua_rawgeti(L, 6, col+1); // raw-value at position 12
jbe/bsw@0 1291 }
jbe@375 1292 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375 1293 lua_pushvalue(L, 11); // copy of field name
jbe@375 1294 lua_pushvalue(L, 5); // mutability state saver function
jbe@375 1295 lua_pushvalue(L, 12); // copy of value
jbe@375 1296 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375 1297 lua_rawset(L, 9); // store mutability state in _dirty table
jbe@375 1298 }
jbe@375 1299 lua_pushvalue(L, 12); // 13
jbe@374 1300 lua_rawseti(L, 6, col+1);
jbe@374 1301 lua_rawset(L, 8);
jbe@399 1302 lua_settop(L, 9);
jbe/bsw@0 1303 }
jbe/bsw@0 1304 }
jbe/bsw@0 1305 }
jbe@374 1306 lua_settop(L, 5);
jbe/bsw@0 1307 }
jbe@23 1308 // return nil as first result value, followed by result lists/objects:
jbe/bsw@0 1309 lua_settop(L, 3);
jbe/bsw@0 1310 lua_pushnil(L);
jbe/bsw@0 1311 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1312 lua_rawgeti(L, 3, command_idx+1);
jbe/bsw@0 1313 }
jbe/bsw@0 1314 return command_count+1;
jbe/bsw@0 1315 }
jbe/bsw@0 1316
jbe@397 1317 // method "is_kind_of" of error objects:
jbe@397 1318 static int mondelefant_errorobject_is_kind_of(lua_State *L) {
jbe@397 1319 const char *errclass;
jbe@397 1320 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397 1321 errclass = luaL_checkstring(L, 2);
jbe@397 1322 lua_settop(L, 2);
jbe@397 1323 lua_getfield(L, 1, "code"); // 3
jbe@397 1324 luaL_argcheck(L,
jbe@397 1325 lua_type(L, 3) == LUA_TSTRING,
jbe@397 1326 1,
jbe@397 1327 "field 'code' of error object is not a string"
jbe@397 1328 );
jbe@397 1329 lua_pushboolean(L,
jbe@397 1330 mondelefant_check_error_class(lua_tostring(L, 3), errclass)
jbe@397 1331 );
jbe@397 1332 return 1;
jbe@397 1333 }
jbe@397 1334
jbe@397 1335 // method "wait" of database handles:
jbe@397 1336 static int mondelefant_conn_wait(lua_State *L) {
jbe@397 1337 int argc;
jbe@397 1338 // count number of arguments:
jbe@397 1339 argc = lua_gettop(L);
jbe@397 1340 // insert "try_wait" function/method at stack position 1:
jbe@397 1341 lua_pushcfunction(L, mondelefant_conn_try_wait);
jbe@397 1342 lua_insert(L, 1);
jbe@397 1343 // call "try_wait" method:
jbe@397 1344 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@397 1345 // check, if error occurred:
jbe@397 1346 if (lua_toboolean(L, 1)) {
jbe@397 1347 // raise error
jbe/bsw@0 1348 lua_settop(L, 1);
jbe/bsw@0 1349 return lua_error(L);
jbe/bsw@0 1350 } else {
jbe@397 1351 // return everything but nil error object:
jbe@397 1352 return lua_gettop(L) - 1;
jbe/bsw@0 1353 }
jbe/bsw@0 1354 }
jbe/bsw@0 1355
jbe@23 1356 // method "query" of database handles:
jbe/bsw@0 1357 static int mondelefant_conn_query(lua_State *L) {
jbe/bsw@0 1358 int argc;
jbe@23 1359 // count number of arguments:
jbe/bsw@0 1360 argc = lua_gettop(L);
jbe@23 1361 // insert "try_query" function/method at stack position 1:
jbe/bsw@0 1362 lua_pushcfunction(L, mondelefant_conn_try_query);
jbe@23 1363 lua_insert(L, 1);
jbe@23 1364 // call "try_query" method:
jbe@23 1365 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@23 1366 // check, if error occurred:
jbe@23 1367 if (lua_toboolean(L, 1)) {
jbe@397 1368 // raise error
jbe@397 1369 lua_settop(L, 1);
jbe@397 1370 return lua_error(L);
jbe/bsw@0 1371 } else {
jbe@23 1372 // return everything but nil error object:
jbe@23 1373 return lua_gettop(L) - 1;
jbe/bsw@0 1374 }
jbe/bsw@0 1375 }
jbe/bsw@0 1376
jbe@23 1377 // library function "set_class":
jbe/bsw@0 1378 static int mondelefant_set_class(lua_State *L) {
jbe@23 1379 // ensure that first argument is a database result list/object:
jbe/bsw@0 1380 lua_settop(L, 2);
jbe/bsw@0 1381 lua_getmetatable(L, 1); // 3
jbe/bsw@0 1382 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 4
jbe@64 1383 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 1, "not a database result");
jbe@23 1384 // ensure that second argument is a database class (model):
jbe/bsw@0 1385 lua_settop(L, 2);
jbe/bsw@0 1386 lua_getmetatable(L, 2); // 3
jbe/bsw@0 1387 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 4
jbe@64 1388 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 2, "not a database class");
jbe@23 1389 // set attribute "_class" of result list/object to given class:
jbe/bsw@0 1390 lua_settop(L, 2);
jbe/bsw@0 1391 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1392 lua_setfield(L, 1, "_class");
jbe@23 1393 // test, if database result is a list (and not a single object):
jbe/bsw@0 1394 lua_getfield(L, 1, "_type"); // 3
jbe/bsw@0 1395 lua_pushliteral(L, "list"); // 4
jbe/bsw@0 1396 if (lua_rawequal(L, 3, 4)) {
jbe/bsw@0 1397 int i;
jbe@23 1398 // set attribute "_class" of all elements to given class:
jbe@64 1399 for (i=0; i < lua_rawlen(L, 1); i++) {
jbe/bsw@0 1400 lua_settop(L, 2);
jbe/bsw@0 1401 lua_rawgeti(L, 1, i+1); // 3
jbe/bsw@0 1402 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1403 lua_setfield(L, 3, "_class");
jbe/bsw@0 1404 }
jbe/bsw@0 1405 }
jbe@23 1406 // return first argument:
jbe/bsw@0 1407 lua_settop(L, 1);
jbe/bsw@0 1408 return 1;
jbe/bsw@0 1409 }
jbe/bsw@0 1410
jbe@23 1411 // library function "new_class":
jbe/bsw@0 1412 static int mondelefant_new_class(lua_State *L) {
jbe@397 1413 // if no argument is given, use an empty table:
jbe@397 1414 if (lua_isnoneornil(L, 1)) {
jbe/bsw@0 1415 lua_settop(L, 0);
jbe/bsw@0 1416 lua_newtable(L); // 1
jbe@397 1417 } else {
jbe@397 1418 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397 1419 lua_settop(L, 1);
jbe/bsw@0 1420 }
jbe@23 1421 // set meta-table for database classes (models):
jbe/bsw@0 1422 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe/bsw@0 1423 lua_setmetatable(L, 1);
jbe@23 1424 // check, if "prototype" attribute is not set:
jbe/bsw@0 1425 lua_pushliteral(L, "prototype"); // 2
jbe/bsw@0 1426 lua_rawget(L, 1); // 2
jbe/bsw@0 1427 if (!lua_toboolean(L, 2)) {
jbe@23 1428 // set "prototype" attribute to default prototype:
jbe/bsw@0 1429 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1430 lua_getfield(L,
jbe/bsw@0 1431 LUA_REGISTRYINDEX,
jbe/bsw@0 1432 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1433 ); // 4
jbe/bsw@0 1434 lua_rawset(L, 1);
jbe/bsw@0 1435 }
jbe@23 1436 // set "object" attribute to empty table, unless it is already set:
jbe/bsw@0 1437 lua_settop(L, 1);
jbe/bsw@0 1438 lua_pushliteral(L, "object"); // 2
jbe/bsw@0 1439 lua_rawget(L, 1); // 2
jbe/bsw@0 1440 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1441 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 1442 lua_newtable(L); // 4
jbe/bsw@0 1443 lua_rawset(L, 1);
jbe/bsw@0 1444 }
jbe@23 1445 // set "object_get" attribute to empty table, unless it is already set:
jbe/bsw@0 1446 lua_settop(L, 1);
jbe/bsw@0 1447 lua_pushliteral(L, "object_get"); // 2
jbe/bsw@0 1448 lua_rawget(L, 1); // 2
jbe/bsw@0 1449 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1450 lua_pushliteral(L, "object_get"); // 3
jbe/bsw@0 1451 lua_newtable(L); // 4
jbe/bsw@0 1452 lua_rawset(L, 1);
jbe/bsw@0 1453 }
jbe@23 1454 // set "object_set" attribute to empty table, unless it is already set:
jbe/bsw@0 1455 lua_settop(L, 1);
jbe/bsw@0 1456 lua_pushliteral(L, "object_set"); // 2
jbe/bsw@0 1457 lua_rawget(L, 1); // 2
jbe/bsw@0 1458 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1459 lua_pushliteral(L, "object_set"); // 3
jbe/bsw@0 1460 lua_newtable(L); // 4
jbe/bsw@0 1461 lua_rawset(L, 1);
jbe/bsw@0 1462 }
jbe@23 1463 // set "list" attribute to empty table, unless it is already set:
jbe/bsw@0 1464 lua_settop(L, 1);
jbe/bsw@0 1465 lua_pushliteral(L, "list"); // 2
jbe/bsw@0 1466 lua_rawget(L, 1); // 2
jbe/bsw@0 1467 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1468 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 1469 lua_newtable(L); // 4
jbe/bsw@0 1470 lua_rawset(L, 1);
jbe/bsw@0 1471 }
jbe@23 1472 // set "references" attribute to empty table, unless it is already set:
jbe/bsw@0 1473 lua_settop(L, 1);
jbe/bsw@0 1474 lua_pushliteral(L, "references"); // 2
jbe/bsw@0 1475 lua_rawget(L, 1); // 2
jbe/bsw@0 1476 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1477 lua_pushliteral(L, "references"); // 3
jbe/bsw@0 1478 lua_newtable(L); // 4
jbe/bsw@0 1479 lua_rawset(L, 1);
jbe/bsw@0 1480 }
jbe@23 1481 // set "foreign_keys" attribute to empty table, unless it is already set:
jbe/bsw@0 1482 lua_settop(L, 1);
jbe/bsw@0 1483 lua_pushliteral(L, "foreign_keys"); // 2
jbe/bsw@0 1484 lua_rawget(L, 1); // 2
jbe/bsw@0 1485 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1486 lua_pushliteral(L, "foreign_keys"); // 3
jbe/bsw@0 1487 lua_newtable(L); // 4
jbe/bsw@0 1488 lua_rawset(L, 1);
jbe/bsw@0 1489 }
jbe@23 1490 // return table:
jbe/bsw@0 1491 lua_settop(L, 1);
jbe/bsw@0 1492 return 1;
jbe/bsw@0 1493 }
jbe/bsw@0 1494
jbe@23 1495 // method "get_reference" of classes (models):
jbe/bsw@0 1496 static int mondelefant_class_get_reference(lua_State *L) {
jbe/bsw@0 1497 lua_settop(L, 2);
jbe/bsw@0 1498 while (lua_toboolean(L, 1)) {
jbe@23 1499 // get "references" table:
jbe/bsw@0 1500 lua_getfield(L, 1, "references"); // 3
jbe@23 1501 // perform lookup:
jbe/bsw@0 1502 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1503 lua_gettable(L, 3); // 4
jbe@23 1504 // return result, if lookup was successful:
jbe/bsw@0 1505 if (!lua_isnil(L, 4)) return 1;
jbe@23 1506 // replace current table by its prototype:
jbe/bsw@0 1507 lua_settop(L, 2);
jbe/bsw@0 1508 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1509 lua_rawget(L, 1); // 3
jbe/bsw@0 1510 lua_replace(L, 1);
jbe/bsw@0 1511 }
jbe@23 1512 // return nothing:
jbe/bsw@0 1513 return 0;
jbe/bsw@0 1514 }
jbe/bsw@0 1515
jbe@23 1516 // method "iterate_over_references" of classes (models):
jbe/bsw@0 1517 static int mondelefant_class_iterate_over_references(lua_State *L) {
jbe/bsw@0 1518 return luaL_error(L, "Reference iterator not implemented yet."); // TODO
jbe/bsw@0 1519 }
jbe/bsw@0 1520
jbe@23 1521 // method "get_foreign_key_reference_name" of classes (models):
jbe/bsw@0 1522 static int mondelefant_class_get_foreign_key_reference_name(lua_State *L) {
jbe/bsw@0 1523 lua_settop(L, 2);
jbe/bsw@0 1524 while (lua_toboolean(L, 1)) {
jbe@23 1525 // get "foreign_keys" table:
jbe/bsw@0 1526 lua_getfield(L, 1, "foreign_keys"); // 3
jbe@23 1527 // perform lookup:
jbe/bsw@0 1528 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1529 lua_gettable(L, 3); // 4
jbe@23 1530 // return result, if lookup was successful:
jbe/bsw@0 1531 if (!lua_isnil(L, 4)) return 1;
jbe@23 1532 // replace current table by its prototype:
jbe/bsw@0 1533 lua_settop(L, 2);
jbe/bsw@0 1534 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1535 lua_rawget(L, 1); // 3
jbe/bsw@0 1536 lua_replace(L, 1);
jbe/bsw@0 1537 }
jbe@23 1538 // return nothing:
jbe/bsw@0 1539 return 0;
jbe/bsw@0 1540 }
jbe/bsw@0 1541
jbe@23 1542 // meta-method "__index" of database result lists and objects:
jbe/bsw@0 1543 static int mondelefant_result_index(lua_State *L) {
jbe/bsw@0 1544 const char *result_type;
jbe@23 1545 // only lookup, when key is a string not beginning with an underscore:
jbe/bsw@0 1546 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe@23 1547 return 0;
jbe/bsw@0 1548 }
jbe@384 1549 // value of "_class" attribute or default class on stack position 3:
jbe@23 1550 lua_settop(L, 2);
jbe/bsw@0 1551 lua_getfield(L, 1, "_class"); // 3
jbe/bsw@0 1552 if (!lua_toboolean(L, 3)) {
jbe/bsw@0 1553 lua_settop(L, 2);
jbe/bsw@0 1554 lua_getfield(L,
jbe/bsw@0 1555 LUA_REGISTRYINDEX,
jbe/bsw@0 1556 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1557 ); // 3
jbe/bsw@0 1558 }
jbe@23 1559 // get value of "_type" attribute:
jbe/bsw@0 1560 lua_getfield(L, 1, "_type"); // 4
jbe/bsw@0 1561 result_type = lua_tostring(L, 4);
jbe@23 1562 // different lookup for lists and objects:
jbe@23 1563 if (result_type && !strcmp(result_type, "object")) { // object
jbe/bsw@0 1564 lua_settop(L, 3);
jbe@384 1565 // try inherited attributes, methods or getter functions:
jbe@383 1566 lua_pushvalue(L, 3); // 4
jbe@383 1567 while (lua_toboolean(L, 4)) {
jbe@383 1568 lua_getfield(L, 4, "object"); // 5
jbe@383 1569 lua_pushvalue(L, 2); // 6
jbe@383 1570 lua_gettable(L, 5); // 6
jbe@383 1571 if (!lua_isnil(L, 6)) return 1;
jbe@383 1572 lua_settop(L, 4);
jbe@383 1573 lua_getfield(L, 4, "object_get"); // 5
jbe@383 1574 lua_pushvalue(L, 2); // 6
jbe@383 1575 lua_gettable(L, 5); // 6
jbe@383 1576 if (lua_toboolean(L, 6)) {
jbe@383 1577 lua_pushvalue(L, 1); // 7
jbe@383 1578 lua_call(L, 1, 1); // 6
jbe/bsw@0 1579 return 1;
jbe/bsw@0 1580 }
jbe@383 1581 lua_settop(L, 4);
jbe@383 1582 lua_pushliteral(L, "prototype"); // 5
jbe@383 1583 lua_rawget(L, 4); // 5
jbe@383 1584 lua_replace(L, 4);
jbe/bsw@0 1585 }
jbe@383 1586 lua_settop(L, 3);
jbe/bsw@0 1587 // try primary keys of referenced objects:
jbe/bsw@0 1588 lua_pushcfunction(L,
jbe/bsw@0 1589 mondelefant_class_get_foreign_key_reference_name
jbe@383 1590 ); // 4
jbe@383 1591 lua_pushvalue(L, 3); // 5
jbe@383 1592 lua_pushvalue(L, 2); // 6
jbe@383 1593 lua_call(L, 2, 1); // 4
jbe@383 1594 if (!lua_isnil(L, 4)) {
jbe@383 1595 // reference name at stack position 4
jbe@383 1596 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@382 1597 lua_pushvalue(L, 3); // 6
jbe@383 1598 lua_pushvalue(L, 4); // 7
jbe@383 1599 lua_call(L, 2, 1); // reference info at stack position 5
jbe@383 1600 lua_getfield(L, 1, "_ref"); // 6
jbe@383 1601 lua_getfield(L, 5, "ref"); // 7
jbe@383 1602 lua_gettable(L, 6); // 7
jbe@383 1603 if (!lua_isnil(L, 7)) {
jbe@383 1604 if (lua_toboolean(L, 7)) {
jbe@383 1605 lua_getfield(L, 5, "that_key"); // 8
jbe@383 1606 if (lua_isnil(L, 8)) {
jbe/bsw@0 1607 return luaL_error(L, "Missing 'that_key' entry in model reference.");
jbe/bsw@0 1608 }
jbe@383 1609 lua_gettable(L, 7); // 8
jbe/bsw@0 1610 } else {
jbe/bsw@0 1611 lua_pushnil(L);
jbe/bsw@0 1612 }
jbe/bsw@0 1613 return 1;
jbe/bsw@0 1614 }
jbe/bsw@0 1615 }
jbe@383 1616 lua_settop(L, 3);
jbe@383 1617 lua_getfield(L, 1, "_data"); // _data table on stack position 4
jbe/bsw@0 1618 // try normal data field info:
jbe@383 1619 lua_pushvalue(L, 2); // 5
jbe@383 1620 lua_gettable(L, 4); // 5
jbe@383 1621 if (!lua_isnil(L, 5)) return 1;
jbe@383 1622 lua_settop(L, 4); // keep _data table on stack
jbe/bsw@0 1623 // try cached referenced object (or cached NULL reference):
jbe@383 1624 lua_getfield(L, 1, "_ref"); // 5
jbe@383 1625 lua_pushvalue(L, 2); // 6
jbe@383 1626 lua_gettable(L, 5); // 6
jbe@383 1627 if (lua_isboolean(L, 6) && !lua_toboolean(L, 6)) {
jbe/bsw@0 1628 lua_pushnil(L);
jbe/bsw@0 1629 return 1;
jbe@383 1630 } else if (!lua_isnil(L, 6)) {
jbe/bsw@0 1631 return 1;
jbe/bsw@0 1632 }
jbe@383 1633 lua_settop(L, 4);
jbe/bsw@0 1634 // try to load a referenced object:
jbe@383 1635 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@383 1636 lua_pushvalue(L, 3); // 6
jbe@383 1637 lua_pushvalue(L, 2); // 7
jbe@383 1638 lua_call(L, 2, 1); // 5
jbe@383 1639 if (!lua_isnil(L, 5)) {
jbe/bsw@0 1640 lua_settop(L, 2);
jbe/bsw@0 1641 lua_getfield(L, 1, "load"); // 3
jbe/bsw@0 1642 lua_pushvalue(L, 1); // 4 (self)
jbe/bsw@0 1643 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1644 lua_call(L, 2, 0);
jbe/bsw@0 1645 lua_settop(L, 2);
jbe/bsw@0 1646 lua_getfield(L, 1, "_ref"); // 3
jbe/bsw@0 1647 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1648 lua_gettable(L, 3); // 4
jbe/bsw@0 1649 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) lua_pushnil(L); // TODO: use special object instead of false
jbe/bsw@0 1650 return 1;
jbe/bsw@0 1651 }
jbe@383 1652 lua_settop(L, 4);
jbe@383 1653 // try proxy access to document in special column:
jbe@383 1654 lua_getfield(L, 3, "document_column"); // 5
jbe@383 1655 if (lua_toboolean(L, 5)) {
jbe@383 1656 lua_gettable(L, 4); // 5
jbe@383 1657 if (!lua_isnil(L, 5)) {
jbe@383 1658 lua_pushvalue(L, 2); // 6
jbe@383 1659 lua_gettable(L, 5); // 6
jbe@383 1660 if (!lua_isnil(L, 6)) return 1;
jbe@383 1661 }
jbe@383 1662 }
jbe/bsw@0 1663 return 0;
jbe@23 1664 } else if (result_type && !strcmp(result_type, "list")) { // list
jbe/bsw@0 1665 lua_settop(L, 3);
jbe/bsw@0 1666 // try inherited list attributes or methods:
jbe/bsw@0 1667 while (lua_toboolean(L, 3)) {
jbe/bsw@0 1668 lua_getfield(L, 3, "list"); // 4
jbe/bsw@0 1669 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1670 lua_gettable(L, 4); // 5
jbe/bsw@0 1671 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 1672 lua_settop(L, 3);
jbe/bsw@0 1673 lua_pushliteral(L, "prototype"); // 4
jbe/bsw@0 1674 lua_rawget(L, 3); // 4
jbe/bsw@0 1675 lua_replace(L, 3);
jbe/bsw@0 1676 }
jbe/bsw@0 1677 }
jbe@23 1678 // return nothing:
jbe/bsw@0 1679 return 0;
jbe/bsw@0 1680 }
jbe/bsw@0 1681
jbe@23 1682 // meta-method "__newindex" of database result lists and objects:
jbe/bsw@0 1683 static int mondelefant_result_newindex(lua_State *L) {
jbe/bsw@0 1684 const char *result_type;
jbe@23 1685 // perform rawset, unless key is a string not starting with underscore:
jbe/bsw@0 1686 lua_settop(L, 3);
jbe/bsw@0 1687 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe/bsw@0 1688 lua_rawset(L, 1);
jbe/bsw@0 1689 return 1;
jbe/bsw@0 1690 }
jbe@384 1691 // value of "_class" attribute or default class on stack position 4:
jbe@384 1692 lua_settop(L, 3);
jbe/bsw@0 1693 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0 1694 if (!lua_toboolean(L, 4)) {
jbe/bsw@0 1695 lua_settop(L, 3);
jbe/bsw@0 1696 lua_getfield(L,
jbe/bsw@0 1697 LUA_REGISTRYINDEX,
jbe/bsw@0 1698 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1699 ); // 4
jbe/bsw@0 1700 }
jbe@23 1701 // get value of "_type" attribute:
jbe/bsw@0 1702 lua_getfield(L, 1, "_type"); // 5
jbe/bsw@0 1703 result_type = lua_tostring(L, 5);
jbe@378 1704 // distinguish between lists and objects:
jbe@378 1705 if (result_type && !strcmp(result_type, "object")) { // objects
jbe@378 1706 lua_settop(L, 4);
jbe@378 1707 // try object setter functions:
jbe@384 1708 lua_pushvalue(L, 4); // 5
jbe@384 1709 while (lua_toboolean(L, 5)) {
jbe@384 1710 lua_getfield(L, 5, "object_set"); // 6
jbe@384 1711 lua_pushvalue(L, 2); // 7
jbe@384 1712 lua_gettable(L, 6); // 7
jbe@384 1713 if (lua_toboolean(L, 7)) {
jbe@384 1714 lua_pushvalue(L, 1); // 8
jbe@384 1715 lua_pushvalue(L, 3); // 9
jbe@378 1716 lua_call(L, 2, 0);
jbe@378 1717 return 0;
jbe@378 1718 }
jbe@384 1719 lua_settop(L, 5);
jbe@384 1720 lua_pushliteral(L, "prototype"); // 6
jbe@384 1721 lua_rawget(L, 5); // 6
jbe@384 1722 lua_replace(L, 5);
jbe@378 1723 }
jbe@384 1724 lua_settop(L, 4);
jbe@384 1725 lua_getfield(L, 1, "_data"); // _data table on stack position 5
jbe/bsw@0 1726 // check, if a object reference is changed:
jbe@384 1727 lua_pushcfunction(L, mondelefant_class_get_reference); // 6
jbe@384 1728 lua_pushvalue(L, 4); // 7
jbe@384 1729 lua_pushvalue(L, 2); // 8
jbe@384 1730 lua_call(L, 2, 1); // 6
jbe@384 1731 if (!lua_isnil(L, 6)) {
jbe/bsw@0 1732 // store object in _ref table (use false for nil): // TODO: use special object instead of false
jbe@384 1733 lua_getfield(L, 1, "_ref"); // 7
jbe@384 1734 lua_pushvalue(L, 2); // 8
jbe@384 1735 if (lua_isnil(L, 3)) lua_pushboolean(L, 0); // 9
jbe@384 1736 else lua_pushvalue(L, 3); // 9
jbe@384 1737 lua_settable(L, 7);
jbe@384 1738 lua_settop(L, 6);
jbe/bsw@0 1739 // delete referencing key from _data table:
jbe@384 1740 lua_getfield(L, 6, "this_key"); // 7
jbe@384 1741 if (lua_isnil(L, 7)) {
jbe/bsw@0 1742 return luaL_error(L, "Missing 'this_key' entry in model reference.");
jbe/bsw@0 1743 }
jbe@384 1744 lua_pushvalue(L, 7); // 8
jbe@384 1745 lua_pushnil(L); // 9
jbe@384 1746 lua_settable(L, 5);
jbe@384 1747 lua_getfield(L, 1, "_dirty"); // 8
jbe@384 1748 lua_pushvalue(L, 7); // 9
jbe@384 1749 lua_pushboolean(L, 1); // 10
jbe@384 1750 lua_settable(L, 8);
jbe@384 1751 return 0;
jbe@384 1752 }
jbe@384 1753 lua_settop(L, 5);
jbe@384 1754 // check proxy access to document in special column:
jbe@384 1755 lua_getfield(L, 4, "document_column"); // 6
jbe@384 1756 if (lua_toboolean(L, 6)) {
jbe@384 1757 lua_getfield(L, 1, "_column_info"); // 7
jbe@384 1758 lua_pushvalue(L, 2); // 8
jbe@384 1759 lua_gettable(L, 7); // 8
jbe@400 1760 if (!lua_toboolean(L, 8)) {
jbe@384 1761 lua_settop(L, 6);
jbe@384 1762 lua_gettable(L, 5); // 6
jbe@384 1763 if (lua_isnil(L, 6)) {
jbe@384 1764 return luaL_error(L, "Cannot write to document column: document is nil");
jbe@384 1765 }
jbe@384 1766 lua_pushvalue(L, 2); // 7
jbe@384 1767 lua_pushvalue(L, 3); // 8
jbe@384 1768 lua_settable(L, 6);
jbe@384 1769 return 0;
jbe@384 1770 }
jbe@384 1771 }
jbe@384 1772 lua_settop(L, 5);
jbe@384 1773 // store value in data field info:
jbe@384 1774 lua_pushvalue(L, 2); // 6
jbe@384 1775 lua_pushvalue(L, 3); // 7
jbe@384 1776 lua_settable(L, 5);
jbe@384 1777 lua_settop(L, 4);
jbe@384 1778 // mark field as dirty (needs to be UPDATEd on save):
jbe@384 1779 lua_getfield(L, 1, "_dirty"); // 5
jbe@384 1780 lua_pushvalue(L, 2); // 6
jbe@384 1781 lua_pushboolean(L, 1); // 7
jbe@384 1782 lua_settable(L, 5);
jbe@384 1783 lua_settop(L, 4);
jbe@384 1784 // reset reference cache, if neccessary:
jbe@384 1785 lua_pushcfunction(L,
jbe@384 1786 mondelefant_class_get_foreign_key_reference_name
jbe@384 1787 ); // 5
jbe@384 1788 lua_pushvalue(L, 4); // 6
jbe@384 1789 lua_pushvalue(L, 2); // 7
jbe@384 1790 lua_call(L, 2, 1); // 5
jbe@384 1791 if (!lua_isnil(L, 5)) {
jbe@384 1792 lua_getfield(L, 1, "_ref"); // 6
jbe@382 1793 lua_pushvalue(L, 5); // 7
jbe@382 1794 lua_pushnil(L); // 8
jbe@382 1795 lua_settable(L, 6);
jbe/bsw@0 1796 }
jbe/bsw@0 1797 return 0;
jbe@23 1798 } else { // non-objects (i.e. lists)
jbe@23 1799 // perform rawset:
jbe/bsw@0 1800 lua_settop(L, 3);
jbe/bsw@0 1801 lua_rawset(L, 1);
jbe/bsw@0 1802 return 0;
jbe/bsw@0 1803 }
jbe/bsw@0 1804 }
jbe/bsw@0 1805
jbe@23 1806 // meta-method "__index" of classes (models):
jbe/bsw@0 1807 static int mondelefant_class_index(lua_State *L) {
jbe@23 1808 // perform lookup in prototype:
jbe/bsw@0 1809 lua_settop(L, 2);
jbe/bsw@0 1810 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1811 lua_rawget(L, 1); // 3
jbe/bsw@0 1812 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1813 lua_gettable(L, 3); // 4
jbe/bsw@0 1814 return 1;
jbe/bsw@0 1815 }
jbe/bsw@0 1816
jbe@23 1817 // registration information for functions of library:
jbe/bsw@0 1818 static const struct luaL_Reg mondelefant_module_functions[] = {
jbe/bsw@0 1819 {"connect", mondelefant_connect},
jbe/bsw@0 1820 {"set_class", mondelefant_set_class},
jbe/bsw@0 1821 {"new_class", mondelefant_new_class},
jbe/bsw@0 1822 {NULL, NULL}
jbe/bsw@0 1823 };
jbe/bsw@0 1824
jbe@23 1825 // registration information for meta-methods of database connections:
jbe/bsw@0 1826 static const struct luaL_Reg mondelefant_conn_mt_functions[] = {
jbe/bsw@0 1827 {"__gc", mondelefant_conn_free},
jbe/bsw@0 1828 {"__index", mondelefant_conn_index},
jbe/bsw@0 1829 {"__newindex", mondelefant_conn_newindex},
jbe/bsw@0 1830 {NULL, NULL}
jbe/bsw@0 1831 };
jbe/bsw@0 1832
jbe@23 1833 // registration information for methods of database connections:
jbe/bsw@0 1834 static const struct luaL_Reg mondelefant_conn_methods[] = {
jbe/bsw@0 1835 {"close", mondelefant_conn_close},
jbe/bsw@0 1836 {"is_ok", mondelefant_conn_is_ok},
jbe/bsw@0 1837 {"get_transaction_status", mondelefant_conn_get_transaction_status},
jbe@397 1838 {"try_wait", mondelefant_conn_try_wait},
jbe@393 1839 {"wait", mondelefant_conn_wait},
jbe/bsw@0 1840 {"create_list", mondelefant_conn_create_list},
jbe/bsw@0 1841 {"create_object", mondelefant_conn_create_object},
jbe/bsw@0 1842 {"quote_string", mondelefant_conn_quote_string},
jbe/bsw@0 1843 {"quote_binary", mondelefant_conn_quote_binary},
jbe/bsw@0 1844 {"assemble_command", mondelefant_conn_assemble_command},
jbe/bsw@0 1845 {"try_query", mondelefant_conn_try_query},
jbe/bsw@0 1846 {"query", mondelefant_conn_query},
jbe/bsw@0 1847 {NULL, NULL}
jbe/bsw@0 1848 };
jbe/bsw@0 1849
jbe@23 1850 // registration information for meta-methods of error objects:
jbe/bsw@0 1851 static const struct luaL_Reg mondelefant_errorobject_mt_functions[] = {
jbe/bsw@0 1852 {NULL, NULL}
jbe/bsw@0 1853 };
jbe/bsw@0 1854
jbe@23 1855 // registration information for methods of error objects:
jbe/bsw@0 1856 static const struct luaL_Reg mondelefant_errorobject_methods[] = {
jbe@397 1857 {"escalate", lua_error},
jbe/bsw@0 1858 {"is_kind_of", mondelefant_errorobject_is_kind_of},
jbe/bsw@0 1859 {NULL, NULL}
jbe/bsw@0 1860 };
jbe/bsw@0 1861
jbe@23 1862 // registration information for meta-methods of database result lists/objects:
jbe/bsw@0 1863 static const struct luaL_Reg mondelefant_result_mt_functions[] = {
jbe/bsw@0 1864 {"__index", mondelefant_result_index},
jbe/bsw@0 1865 {"__newindex", mondelefant_result_newindex},
jbe/bsw@0 1866 {NULL, NULL}
jbe/bsw@0 1867 };
jbe/bsw@0 1868
jbe@23 1869 // registration information for methods of database result lists/objects:
jbe/bsw@0 1870 static const struct luaL_Reg mondelefant_class_mt_functions[] = {
jbe/bsw@0 1871 {"__index", mondelefant_class_index},
jbe/bsw@0 1872 {NULL, NULL}
jbe/bsw@0 1873 };
jbe/bsw@0 1874
jbe@23 1875 // registration information for methods of classes (models):
jbe/bsw@0 1876 static const struct luaL_Reg mondelefant_class_methods[] = {
jbe/bsw@0 1877 {"get_reference", mondelefant_class_get_reference},
jbe/bsw@0 1878 {"iterate_over_references", mondelefant_class_iterate_over_references},
jbe/bsw@0 1879 {"get_foreign_key_reference_name",
jbe/bsw@0 1880 mondelefant_class_get_foreign_key_reference_name},
jbe/bsw@0 1881 {NULL, NULL}
jbe/bsw@0 1882 };
jbe/bsw@0 1883
jbe@23 1884 // registration information for methods of database result objects (not lists!):
jbe/bsw@0 1885 static const struct luaL_Reg mondelefant_object_methods[] = {
jbe/bsw@0 1886 {NULL, NULL}
jbe/bsw@0 1887 };
jbe/bsw@0 1888
jbe@23 1889 // registration information for methods of database result lists (not single objects!):
jbe/bsw@0 1890 static const struct luaL_Reg mondelefant_list_methods[] = {
jbe/bsw@0 1891 {NULL, NULL}
jbe/bsw@0 1892 };
jbe/bsw@0 1893
jbe@23 1894 // luaopen function to initialize/register library:
jbe/bsw@0 1895 int luaopen_mondelefant_native(lua_State *L) {
jbe/bsw@0 1896 lua_settop(L, 0);
jbe/bsw@0 1897 lua_newtable(L); // module at stack position 1
jbe@64 1898 luaL_setfuncs(L, mondelefant_module_functions, 0);
jbe/bsw@0 1899
jbe/bsw@0 1900 lua_pushvalue(L, 1); // 2
jbe/bsw@0 1901 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe/bsw@0 1902
jbe/bsw@0 1903 lua_newtable(L); // 2
jbe/bsw@0 1904 // NOTE: only PostgreSQL is supported yet:
jbe@64 1905 luaL_setfuncs(L, mondelefant_conn_methods, 0);
jbe/bsw@0 1906 lua_setfield(L, 1, "postgresql_connection_prototype");
jbe/bsw@0 1907 lua_newtable(L); // 2
jbe/bsw@0 1908 lua_setfield(L, 1, "connection_prototype");
jbe/bsw@0 1909
jbe/bsw@0 1910 luaL_newmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe@64 1911 luaL_setfuncs(L, mondelefant_conn_mt_functions, 0);
jbe/bsw@0 1912 lua_settop(L, 1);
jbe/bsw@0 1913 luaL_newmetatable(L, MONDELEFANT_RESULT_MT_REGKEY); // 2
jbe@64 1914 luaL_setfuncs(L, mondelefant_result_mt_functions, 0);
jbe/bsw@0 1915 lua_setfield(L, 1, "result_metatable");
jbe/bsw@0 1916 luaL_newmetatable(L, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe@64 1917 luaL_setfuncs(L, mondelefant_class_mt_functions, 0);
jbe/bsw@0 1918 lua_setfield(L, 1, "class_metatable");
jbe/bsw@0 1919
jbe/bsw@0 1920 lua_newtable(L); // 2
jbe@272 1921 luaL_setfuncs(L, mondelefant_class_methods, 0);
jbe/bsw@0 1922 lua_newtable(L); // 3
jbe@64 1923 luaL_setfuncs(L, mondelefant_object_methods, 0);
jbe/bsw@0 1924 lua_setfield(L, 2, "object");
jbe/bsw@0 1925 lua_newtable(L); // 3
jbe/bsw@0 1926 lua_setfield(L, 2, "object_get");
jbe/bsw@0 1927 lua_newtable(L); // 3
jbe/bsw@0 1928 lua_setfield(L, 2, "object_set");
jbe/bsw@0 1929 lua_newtable(L); // 3
jbe@64 1930 luaL_setfuncs(L, mondelefant_list_methods, 0);
jbe/bsw@0 1931 lua_setfield(L, 2, "list");
jbe/bsw@0 1932 lua_newtable(L); // 3
jbe/bsw@0 1933 lua_setfield(L, 2, "references");
jbe/bsw@0 1934 lua_newtable(L); // 3
jbe/bsw@0 1935 lua_setfield(L, 2, "foreign_keys");
jbe/bsw@0 1936 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1937 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY);
jbe/bsw@0 1938 lua_setfield(L, 1, "class_prototype");
jbe/bsw@0 1939
jbe/bsw@0 1940 luaL_newmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY); // 2
jbe@64 1941 luaL_setfuncs(L, mondelefant_errorobject_mt_functions, 0);
jbe/bsw@0 1942 lua_newtable(L); // 3
jbe@64 1943 luaL_setfuncs(L, mondelefant_errorobject_methods, 0);
jbe/bsw@0 1944 lua_setfield(L, 2, "__index");
jbe/bsw@0 1945 lua_setfield(L, 1, "errorobject_metatable");
jbe/bsw@0 1946
jbe/bsw@0 1947 return 1;
jbe/bsw@0 1948 }

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