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annotate libraries/mondelefant/mondelefant_native.c @ 408:fd5880964d99

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Hack to avoid cumulating memory leaks in case of (caught) out-of-memory errors
author jbe
date Thu Jan 07 01:23:08 2016 +0100 (2016-01-07)
parents 0e641ac76647
children ebe9416db4e0
rev   line source
jbe/bsw@0 1 #include <lua.h>
jbe/bsw@0 2 #include <lauxlib.h>
jbe/bsw@0 3 #include <libpq-fe.h>
jbe/bsw@0 4 #include <postgres.h>
jbe/bsw@0 5 #include <catalog/pg_type.h>
jbe/bsw@0 6 #include <stdint.h>
jbe@393 7 #include <time.h>
jbe/bsw@0 8
jbe@23 9 // NOTE: Comments with format "// <number>" denote the Lua stack position
jbe@23 10
jbe@23 11 // prefix for all Lua registry entries of this library:
jbe@402 12 #define MONDELEFANT_REGKEY "mondelefant_"
jbe/bsw@0 13
jbe@23 14 // registry key of module "mondelefant_native":
jbe@23 15 #define MONDELEFANT_MODULE_REGKEY (MONDELEFANT_REGKEY "module")
jbe@23 16 // registry key of meta-table for database connections:
jbe@23 17 #define MONDELEFANT_CONN_MT_REGKEY (MONDELEFANT_REGKEY "connection")
jbe@23 18 // registry key of meta-table for database result lists and objects:
jbe@23 19 #define MONDELEFANT_RESULT_MT_REGKEY (MONDELEFANT_REGKEY "result")
jbe@23 20 // registry key of meta-table for database error objects:
jbe@23 21 #define MONDELEFANT_ERROROBJECT_MT_REGKEY (MONDELEFANT_REGKEY "errorobject")
jbe@23 22 // registry key of meta-table for models (named classes here):
jbe@23 23 #define MONDELEFANT_CLASS_MT_REGKEY (MONDELEFANT_REGKEY "class")
jbe@23 24 // registry key of default prototype for models/classes:
jbe@23 25 #define MONDELEFANT_CLASS_PROTO_REGKEY (MONDELEFANT_REGKEY "class_proto")
jbe/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@408 31 void *todo_PQfreemem;
jbe@408 32 PGresult *todo_PQclear;
jbe/bsw@0 33 } mondelefant_conn_t;
jbe@23 34 #define MONDELEFANT_SERVER_ENCODING_ASCII 0
jbe@23 35 #define MONDELEFANT_SERVER_ENCODING_UTF8 1
jbe/bsw@0 36
jbe@408 37 // hack to avoid cumulating memory leaks in case of out-of-memory errors
jbe@408 38 static void mondelefant_cleanup(mondelefant_conn_t *conn) {
jbe@408 39 if (conn->todo_PQfreemem) {
jbe@408 40 PQfreemem(conn->todo_PQfreemem);
jbe@408 41 conn->todo_PQfreemem = NULL;
jbe@408 42 }
jbe@408 43 if (conn->todo_PQclear) {
jbe@408 44 PQclear(conn->todo_PQclear);
jbe@408 45 conn->todo_PQclear = NULL;
jbe@408 46 }
jbe@408 47 }
jbe@408 48
jbe@23 49 // transform codepoint-position to byte-position for a given UTF-8 string:
jbe/bsw@0 50 static size_t utf8_position_to_byte(const char *str, size_t utf8pos) {
jbe/bsw@0 51 size_t bytepos;
jbe/bsw@0 52 for (bytepos = 0; utf8pos > 0; bytepos++) {
jbe/bsw@0 53 uint8_t c;
jbe/bsw@0 54 c = ((const uint8_t *)str)[bytepos];
jbe/bsw@0 55 if (!c) break;
jbe/bsw@0 56 if (c <= 0x7f || c >= 0xc0) utf8pos--;
jbe/bsw@0 57 }
jbe/bsw@0 58 return bytepos;
jbe/bsw@0 59 }
jbe/bsw@0 60
jbe@23 61 // PostgreSQL's OID for binary data type (bytea):
jbe/bsw@0 62 #define MONDELEFANT_POSTGRESQL_BINARY_OID ((Oid)17)
jbe/bsw@0 63
jbe@23 64 // mapping a PostgreSQL type given by its OID to a string identifier:
jbe/bsw@0 65 static const char *mondelefant_oid_to_typestr(Oid oid) {
jbe/bsw@0 66 switch (oid) {
jbe/bsw@0 67 case 16: return "bool";
jbe/bsw@0 68 case 17: return "bytea";
jbe/bsw@0 69 case 18: return "char";
jbe/bsw@0 70 case 19: return "name";
jbe/bsw@0 71 case 20: return "int8";
jbe/bsw@0 72 case 21: return "int2";
jbe/bsw@0 73 case 23: return "int4";
jbe/bsw@0 74 case 25: return "text";
jbe/bsw@0 75 case 26: return "oid";
jbe/bsw@0 76 case 27: return "tid";
jbe/bsw@0 77 case 28: return "xid";
jbe/bsw@0 78 case 29: return "cid";
jbe@176 79 case 114: return "json";
jbe/bsw@0 80 case 600: return "point";
jbe/bsw@0 81 case 601: return "lseg";
jbe/bsw@0 82 case 602: return "path";
jbe/bsw@0 83 case 603: return "box";
jbe/bsw@0 84 case 604: return "polygon";
jbe/bsw@0 85 case 628: return "line";
jbe/bsw@0 86 case 700: return "float4";
jbe/bsw@0 87 case 701: return "float8";
jbe/bsw@0 88 case 705: return "unknown";
jbe/bsw@0 89 case 718: return "circle";
jbe/bsw@0 90 case 790: return "money";
jbe/bsw@0 91 case 829: return "macaddr";
jbe/bsw@0 92 case 869: return "inet";
jbe/bsw@0 93 case 650: return "cidr";
jbe/bsw@0 94 case 1042: return "bpchar";
jbe/bsw@0 95 case 1043: return "varchar";
jbe/bsw@0 96 case 1082: return "date";
jbe/bsw@0 97 case 1083: return "time";
jbe/bsw@0 98 case 1114: return "timestamp";
jbe/bsw@0 99 case 1184: return "timestamptz";
jbe/bsw@0 100 case 1186: return "interval";
jbe/bsw@0 101 case 1266: return "timetz";
jbe/bsw@0 102 case 1560: return "bit";
jbe/bsw@0 103 case 1562: return "varbit";
jbe/bsw@0 104 case 1700: return "numeric";
jbe@176 105 case 3802: return "jsonb";
jbe/bsw@0 106 default: return NULL;
jbe/bsw@0 107 }
jbe/bsw@0 108 }
jbe/bsw@0 109
jbe@23 110 // This library maps PostgreSQL's error codes to CamelCase string
jbe@23 111 // identifiers, which consist of CamelCase identifiers and are seperated
jbe@23 112 // by dots (".") (no leading or trailing dots).
jbe@23 113 // There are additional error identifiers which do not have a corresponding
jbe@23 114 // PostgreSQL error associated with it.
jbe@23 115
jbe@23 116 // matching start of local variable 'pgcode' against string 'incode',
jbe@23 117 // returning string 'outcode' on match:
jbe/bsw@0 118 #define mondelefant_errcode_item(incode, outcode) \
jbe/bsw@0 119 if (!strncmp(pgcode, (incode), strlen(incode))) return outcode; else
jbe/bsw@0 120
jbe@23 121 // additional error identifiers without corresponding PostgreSQL error:
jbe/bsw@0 122 #define MONDELEFANT_ERRCODE_UNKNOWN "unknown"
jbe/bsw@0 123 #define MONDELEFANT_ERRCODE_CONNECTION "ConnectionException"
jbe/bsw@0 124 #define MONDELEFANT_ERRCODE_RESULTCOUNT_LOW "WrongResultSetCount.ResultSetMissing"
jbe/bsw@0 125 #define MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH "WrongResultSetCount.TooManyResults"
jbe/bsw@0 126 #define MONDELEFANT_ERRCODE_QUERY1_NO_ROWS "NoData.OneRowExpected"
jbe/bsw@0 127 #define MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS "CardinalityViolation.OneRowExpected"
jbe/bsw@0 128
jbe@23 129 // mapping PostgreSQL error code to error code as returned by this library:
jbe/bsw@0 130 static const char *mondelefant_translate_errcode(const char *pgcode) {
jbe/bsw@0 131 if (!pgcode) abort(); // should not happen
jbe/bsw@0 132 mondelefant_errcode_item("02", "NoData")
jbe/bsw@0 133 mondelefant_errcode_item("03", "SqlStatementNotYetComplete")
jbe/bsw@0 134 mondelefant_errcode_item("08", "ConnectionException")
jbe/bsw@0 135 mondelefant_errcode_item("09", "TriggeredActionException")
jbe/bsw@0 136 mondelefant_errcode_item("0A", "FeatureNotSupported")
jbe/bsw@0 137 mondelefant_errcode_item("0B", "InvalidTransactionInitiation")
jbe/bsw@0 138 mondelefant_errcode_item("0F", "LocatorException")
jbe/bsw@0 139 mondelefant_errcode_item("0L", "InvalidGrantor")
jbe/bsw@0 140 mondelefant_errcode_item("0P", "InvalidRoleSpecification")
jbe/bsw@0 141 mondelefant_errcode_item("21", "CardinalityViolation")
jbe/bsw@0 142 mondelefant_errcode_item("22", "DataException")
jbe/bsw@0 143 mondelefant_errcode_item("23001", "IntegrityConstraintViolation.RestrictViolation")
jbe/bsw@0 144 mondelefant_errcode_item("23502", "IntegrityConstraintViolation.NotNullViolation")
jbe/bsw@0 145 mondelefant_errcode_item("23503", "IntegrityConstraintViolation.ForeignKeyViolation")
jbe/bsw@0 146 mondelefant_errcode_item("23505", "IntegrityConstraintViolation.UniqueViolation")
jbe/bsw@0 147 mondelefant_errcode_item("23514", "IntegrityConstraintViolation.CheckViolation")
jbe/bsw@0 148 mondelefant_errcode_item("23", "IntegrityConstraintViolation")
jbe/bsw@0 149 mondelefant_errcode_item("24", "InvalidCursorState")
jbe/bsw@0 150 mondelefant_errcode_item("25", "InvalidTransactionState")
jbe/bsw@0 151 mondelefant_errcode_item("26", "InvalidSqlStatementName")
jbe/bsw@0 152 mondelefant_errcode_item("27", "TriggeredDataChangeViolation")
jbe/bsw@0 153 mondelefant_errcode_item("28", "InvalidAuthorizationSpecification")
jbe/bsw@0 154 mondelefant_errcode_item("2B", "DependentPrivilegeDescriptorsStillExist")
jbe/bsw@0 155 mondelefant_errcode_item("2D", "InvalidTransactionTermination")
jbe/bsw@0 156 mondelefant_errcode_item("2F", "SqlRoutineException")
jbe/bsw@0 157 mondelefant_errcode_item("34", "InvalidCursorName")
jbe/bsw@0 158 mondelefant_errcode_item("38", "ExternalRoutineException")
jbe/bsw@0 159 mondelefant_errcode_item("39", "ExternalRoutineInvocationException")
jbe/bsw@0 160 mondelefant_errcode_item("3B", "SavepointException")
jbe/bsw@0 161 mondelefant_errcode_item("3D", "InvalidCatalogName")
jbe/bsw@0 162 mondelefant_errcode_item("3F", "InvalidSchemaName")
jbe/bsw@0 163 mondelefant_errcode_item("40", "TransactionRollback")
jbe/bsw@0 164 mondelefant_errcode_item("42", "SyntaxErrorOrAccessRuleViolation")
jbe/bsw@0 165 mondelefant_errcode_item("44", "WithCheckOptionViolation")
jbe/bsw@0 166 mondelefant_errcode_item("53", "InsufficientResources")
jbe/bsw@0 167 mondelefant_errcode_item("54", "ProgramLimitExceeded")
jbe/bsw@0 168 mondelefant_errcode_item("55", "ObjectNotInPrerequisiteState")
jbe/bsw@0 169 mondelefant_errcode_item("57", "OperatorIntervention")
jbe/bsw@0 170 mondelefant_errcode_item("58", "SystemError")
jbe/bsw@0 171 mondelefant_errcode_item("F0", "ConfigurationFileError")
jbe/bsw@0 172 mondelefant_errcode_item("P0", "PlpgsqlError")
jbe/bsw@0 173 mondelefant_errcode_item("XX", "InternalError")
jbe/bsw@0 174 return "unknown";
jbe/bsw@0 175 }
jbe/bsw@0 176
jbe@23 177 // C-function, checking if a given error code (as defined by this library)
jbe@23 178 // is belonging to a certain class of errors (strings are equal or error
jbe@23 179 // code begins with error class followed by a dot):
jbe/bsw@0 180 static int mondelefant_check_error_class(
jbe/bsw@0 181 const char *errcode, const char *errclass
jbe/bsw@0 182 ) {
jbe/bsw@0 183 size_t i = 0;
jbe/bsw@0 184 while (1) {
jbe/bsw@0 185 if (errclass[i] == 0) {
jbe/bsw@0 186 if (errcode[i] == 0 || errcode[i] == '.') return 1;
jbe/bsw@0 187 else return 0;
jbe/bsw@0 188 }
jbe/bsw@0 189 if (errcode[i] != errclass[i]) return 0;
jbe/bsw@0 190 i++;
jbe/bsw@0 191 }
jbe/bsw@0 192 }
jbe/bsw@0 193
jbe@23 194 // pushing first line of a string on Lua's stack (without trailing CR/LF):
jbe/bsw@0 195 static void mondelefant_push_first_line(lua_State *L, const char *str) {
jbe/bsw@0 196 size_t i = 0;
jbe/bsw@0 197 if (!str) abort(); // should not happen
jbe/bsw@0 198 while (1) {
jbe@397 199 char c = str[i];
jbe@397 200 if (c == '\n' || c == '\r' || c == 0) {
jbe@397 201 lua_pushlstring(L, str, i);
jbe@397 202 return;
jbe@397 203 }
jbe/bsw@0 204 i++;
jbe@397 205 }
jbe/bsw@0 206 }
jbe/bsw@0 207
jbe@23 208 // "connect" function of library, which establishes a database connection
jbe@23 209 // and returns a database connection handle:
jbe/bsw@0 210 static int mondelefant_connect(lua_State *L) {
jbe@23 211 const char *conninfo; // string for PQconnectdb function
jbe@23 212 mondelefant_conn_t *conn; // C-structure for userdata
jbe@402 213 // check if string is given as first argument:
jbe@402 214 if (lua_type(L, 1) != LUA_TSTRING) {
jbe@402 215 // expect a table as first argument if no string is given:
jbe@402 216 luaL_checktype(L, 1, LUA_TTABLE);
jbe@406 217 // extract conninfo string for PQconnectdb if possible:
jbe@406 218 lua_getfield(L, 1, "conninfo");
jbe@406 219 if (!lua_isnil(L, -1)) {
jbe@402 220 // if yes, use that value but check its type:
jbe@406 221 luaL_argcheck(L, lua_type(L, -1) == LUA_TSTRING, 1, "\"conninfo\" value is not a string");
jbe@402 222 } else {
jbe@402 223 // otherwise assemble conninfo string from the named options:
jbe@402 224 luaL_Buffer buf;
jbe@40 225 int need_seperator = 0;
jbe@402 226 const char *value;
jbe@402 227 size_t value_len;
jbe@402 228 size_t value_pos = 0;
jbe@402 229 lua_settop(L, 1);
jbe@402 230 lua_pushnil(L); // slot for key at stack position 2
jbe@402 231 lua_pushnil(L); // slot for value at stack position 3
jbe@402 232 luaL_buffinit(L, &buf);
jbe@40 233 while (lua_pushvalue(L, 2), lua_next(L, 1)) {
jbe@402 234 luaL_argcheck(L, lua_isstring(L, -2), 1, "key in table is not a string");
jbe@402 235 luaL_argcheck(L, lua_isstring(L, -1), 1, "value in table is not a string");
jbe@402 236 value = lua_tolstring(L, -1, &value_len);
jbe@40 237 lua_replace(L, 3);
jbe@402 238 lua_pop(L, 1);
jbe@40 239 lua_replace(L, 2);
jbe@402 240 if (need_seperator) luaL_addchar(&buf, ' ');
jbe@40 241 // NOTE: numbers will be converted to strings automatically here,
jbe@40 242 // but perhaps this will change in future versions of lua
jbe@40 243 lua_pushvalue(L, 2);
jbe@402 244 luaL_addvalue(&buf);
jbe@402 245 luaL_addchar(&buf, '=');
jbe@402 246 luaL_addchar(&buf, '\'');
jbe@402 247 do {
jbe@402 248 char c;
jbe@402 249 c = value[value_pos++];
jbe@402 250 if (c == '\'') luaL_addchar(&buf, '\\');
jbe@402 251 luaL_addchar(&buf, c);
jbe@402 252 } while (value_pos < value_len);
jbe@402 253 luaL_addchar(&buf, '\'');
jbe@402 254 need_seperator = 1;
jbe/bsw@0 255 }
jbe@402 256 luaL_pushresult(&buf);
jbe/bsw@0 257 }
jbe@402 258 // ensure that string is on stack position 1 which is the top of stack:
jbe@402 259 lua_replace(L, 1);
jbe/bsw@0 260 }
jbe@402 261 // use conninfo string on stack position 1:
jbe@402 262 conninfo = lua_tostring(L, 1);
jbe@406 263 // create userdata on stack position 2:
jbe@406 264 lua_settop(L, 1);
jbe@406 265 conn = lua_newuserdata(L, sizeof(*conn)); // 2
jbe@23 266 // call PQconnectdb function of libpq:
jbe@406 267 conn->pgconn = PQconnectdb(conninfo);
jbe@406 268 // try emergency garbage collection on first failure:
jbe@406 269 if (!conn->pgconn) {
jbe@406 270 lua_gc(L, LUA_GCCOLLECT, 0);
jbe@406 271 conn->pgconn = PQconnectdb(conninfo);
jbe@407 272 // throw error in case of (unexpected) error of PQconnectdb call:
jbe@407 273 if (!conn->pgconn) return luaL_error(L,
jbe@407 274 "Error in libpq while creating 'PGconn' structure."
jbe@407 275 );
jbe/bsw@0 276 }
jbe@406 277 // set metatable for userdata (ensure PQfinish on unexpected error below):
jbe@406 278 luaL_setmetatable(L, MONDELEFANT_CONN_MT_REGKEY);
jbe@406 279 // check result of PQconnectdb call:
jbe@406 280 if (PQstatus(conn->pgconn) != CONNECTION_OK) {
jbe@406 281 lua_pushnil(L); // 3
jbe@406 282 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 4
jbe@406 283 lua_newtable(L); // 5
jbe@406 284 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe/bsw@0 285 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@406 286 lua_setfield(L, 5, "code");
jbe@406 287 lua_pushvalue(L, 4);
jbe@406 288 lua_setfield(L, 5, "message");
jbe@406 289 // manual PQfinish (do not wait until garbage collection):
jbe@406 290 PQfinish(conn->pgconn);
jbe@406 291 conn->pgconn = NULL;
jbe/bsw@0 292 return 3;
jbe/bsw@0 293 }
jbe@23 294 // set 'server_encoding' in C-struct of userdata:
jbe/bsw@0 295 {
jbe/bsw@0 296 const char *charset;
jbe@406 297 charset = PQparameterStatus(conn->pgconn, "server_encoding");
jbe/bsw@0 298 if (charset && !strcmp(charset, "UTF8")) {
jbe/bsw@0 299 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_UTF8;
jbe/bsw@0 300 } else {
jbe/bsw@0 301 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_ASCII;
jbe/bsw@0 302 }
jbe/bsw@0 303 }
jbe@396 304 // create and associate userdata table:
jbe@396 305 lua_newtable(L);
jbe@406 306 lua_setuservalue(L, 2);
jbe@396 307 // store key "fd" with file descriptor of connection:
jbe@406 308 lua_pushinteger(L, PQsocket(conn->pgconn));
jbe@406 309 lua_setfield(L, 2, "fd");
jbe@23 310 // store key "engine" with value "postgresql" as connection specific data:
jbe/bsw@0 311 lua_pushliteral(L, "postgresql");
jbe@406 312 lua_setfield(L, 2, "engine");
jbe@23 313 // return userdata:
jbe/bsw@0 314 return 1;
jbe/bsw@0 315 }
jbe/bsw@0 316
jbe@23 317 // returns pointer to libpq handle 'pgconn' of userdata at given index
jbe@23 318 // (or throws error, if database connection has been closed):
jbe/bsw@0 319 static mondelefant_conn_t *mondelefant_get_conn(lua_State *L, int index) {
jbe/bsw@0 320 mondelefant_conn_t *conn;
jbe/bsw@0 321 conn = luaL_checkudata(L, index, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 322 if (!conn->pgconn) {
jbe/bsw@0 323 luaL_error(L, "PostgreSQL connection has been closed.");
jbe/bsw@0 324 return NULL;
jbe/bsw@0 325 }
jbe/bsw@0 326 return conn;
jbe/bsw@0 327 }
jbe/bsw@0 328
jbe@23 329 // meta-method "__index" of database handles (userdata):
jbe/bsw@0 330 static int mondelefant_conn_index(lua_State *L) {
jbe@23 331 // try table for connection specific data:
jbe/bsw@0 332 lua_settop(L, 2);
jbe@396 333 lua_getuservalue(L, 1); // 3
jbe/bsw@0 334 lua_pushvalue(L, 2); // 4
jbe/bsw@0 335 lua_gettable(L, 3); // 4
jbe/bsw@0 336 if (!lua_isnil(L, 4)) return 1;
jbe@23 337 // try to use prototype stored in connection specific data:
jbe/bsw@0 338 lua_settop(L, 3);
jbe/bsw@0 339 lua_getfield(L, 3, "prototype"); // 4
jbe/bsw@0 340 if (lua_toboolean(L, 4)) {
jbe/bsw@0 341 lua_pushvalue(L, 2); // 5
jbe/bsw@0 342 lua_gettable(L, 4); // 5
jbe/bsw@0 343 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 344 }
jbe@23 345 // try to use "postgresql_connection_prototype" of library:
jbe/bsw@0 346 lua_settop(L, 2);
jbe/bsw@0 347 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY); // 3
jbe/bsw@0 348 lua_getfield(L, 3, "postgresql_connection_prototype"); // 4
jbe/bsw@0 349 if (lua_toboolean(L, 4)) {
jbe/bsw@0 350 lua_pushvalue(L, 2); // 5
jbe/bsw@0 351 lua_gettable(L, 4); // 5
jbe/bsw@0 352 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 353 }
jbe@23 354 // try to use "connection_prototype" of library:
jbe/bsw@0 355 lua_settop(L, 3);
jbe/bsw@0 356 lua_getfield(L, 3, "connection_prototype"); // 4
jbe/bsw@0 357 if (lua_toboolean(L, 4)) {
jbe/bsw@0 358 lua_pushvalue(L, 2); // 5
jbe/bsw@0 359 lua_gettable(L, 4); // 5
jbe/bsw@0 360 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 361 }
jbe@23 362 // give up and return nothing:
jbe/bsw@0 363 return 0;
jbe/bsw@0 364 }
jbe/bsw@0 365
jbe@23 366 // meta-method "__newindex" of database handles (userdata):
jbe/bsw@0 367 static int mondelefant_conn_newindex(lua_State *L) {
jbe@23 368 // store key-value pair in table for connection specific data:
jbe/bsw@0 369 lua_settop(L, 3);
jbe@396 370 lua_getuservalue(L, 1); // 4
jbe/bsw@0 371 lua_pushvalue(L, 2);
jbe/bsw@0 372 lua_pushvalue(L, 3);
jbe/bsw@0 373 lua_settable(L, 4);
jbe@23 374 // return nothing:
jbe/bsw@0 375 return 0;
jbe/bsw@0 376 }
jbe/bsw@0 377
jbe@23 378 // meta-method "__gc" of database handles:
jbe/bsw@0 379 static int mondelefant_conn_free(lua_State *L) {
jbe/bsw@0 380 mondelefant_conn_t *conn;
jbe/bsw@0 381 conn = luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 382 if (conn->pgconn) PQfinish(conn->pgconn);
jbe/bsw@0 383 conn->pgconn = NULL;
jbe/bsw@0 384 return 0;
jbe/bsw@0 385 }
jbe/bsw@0 386
jbe@23 387 // method "close" of database handles:
jbe/bsw@0 388 static int mondelefant_conn_close(lua_State *L) {
jbe/bsw@0 389 mondelefant_conn_t *conn;
jbe/bsw@0 390 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 391 PQfinish(conn->pgconn);
jbe/bsw@0 392 conn->pgconn = NULL;
jbe@397 393 lua_pushnil(L);
jbe@396 394 lua_setfield(L, 1, "fd"); // set "fd" attribute to nil
jbe/bsw@0 395 return 0;
jbe/bsw@0 396 }
jbe/bsw@0 397
jbe@23 398 // method "is_okay" of database handles:
jbe/bsw@0 399 static int mondelefant_conn_is_ok(lua_State *L) {
jbe/bsw@0 400 mondelefant_conn_t *conn;
jbe/bsw@0 401 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 402 lua_pushboolean(L, PQstatus(conn->pgconn) == CONNECTION_OK);
jbe/bsw@0 403 return 1;
jbe/bsw@0 404 }
jbe/bsw@0 405
jbe@23 406 // method "get_transaction_status" of database handles:
jbe/bsw@0 407 static int mondelefant_conn_get_transaction_status(lua_State *L) {
jbe/bsw@0 408 mondelefant_conn_t *conn;
jbe/bsw@0 409 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 410 switch (PQtransactionStatus(conn->pgconn)) {
jbe/bsw@0 411 case PQTRANS_IDLE:
jbe/bsw@0 412 lua_pushliteral(L, "idle");
jbe/bsw@0 413 break;
jbe/bsw@0 414 case PQTRANS_ACTIVE:
jbe/bsw@0 415 lua_pushliteral(L, "active");
jbe/bsw@0 416 break;
jbe/bsw@0 417 case PQTRANS_INTRANS:
jbe/bsw@0 418 lua_pushliteral(L, "intrans");
jbe/bsw@0 419 break;
jbe/bsw@0 420 case PQTRANS_INERROR:
jbe/bsw@0 421 lua_pushliteral(L, "inerror");
jbe/bsw@0 422 break;
jbe/bsw@0 423 default:
jbe/bsw@0 424 lua_pushliteral(L, "unknown");
jbe/bsw@0 425 }
jbe/bsw@0 426 return 1;
jbe/bsw@0 427 }
jbe/bsw@0 428
jbe@397 429 // method "try_wait" of database handles:
jbe@397 430 static int mondelefant_conn_try_wait(lua_State *L) {
jbe@393 431 mondelefant_conn_t *conn;
jbe@393 432 int infinite, nonblock = 0;
jbe@393 433 struct timespec wakeup;
jbe@393 434 int fd;
jbe@393 435 fd_set fds;
jbe@393 436 conn = mondelefant_get_conn(L, 1);
jbe@393 437 infinite = lua_isnoneornil(L, 2);
jbe@393 438 if (!infinite) {
jbe@393 439 lua_Number n;
jbe@393 440 int isnum;
jbe@393 441 n = lua_tonumberx(L, 2, &isnum);
jbe@393 442 if (isnum && n>0 && n<=86400*366) {
jbe@393 443 if (clock_gettime(CLOCK_MONOTONIC, &wakeup)) {
jbe@393 444 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 445 }
jbe@393 446 wakeup.tv_sec += n;
jbe@393 447 wakeup.tv_nsec += 1000000000 * (n - (time_t)n);
jbe@393 448 if (wakeup.tv_nsec >= 1000000000) {
jbe@393 449 wakeup.tv_sec += 1;
jbe@393 450 wakeup.tv_nsec -= 1000000000;
jbe@393 451 }
jbe@393 452 } else if (isnum && n==0) {
jbe@393 453 nonblock = 1;
jbe@393 454 } else {
jbe@393 455 luaL_argcheck(L, 0, 2, "not a valid timeout");
jbe@393 456 }
jbe@393 457 }
jbe@397 458 lua_settop(L, 1);
jbe@393 459 if (!nonblock) {
jbe@393 460 fd = PQsocket(conn->pgconn);
jbe@393 461 FD_ZERO(&fds);
jbe@393 462 FD_SET(fd, &fds);
jbe@393 463 }
jbe@393 464 while (true) {
jbe@393 465 {
jbe@393 466 PGnotify *notify;
jbe@393 467 if (!PQconsumeInput(conn->pgconn)) {
jbe@397 468 lua_newtable(L); // 2
jbe@406 469 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe@397 470 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@397 471 lua_setfield(L, 2, "code");
jbe@397 472 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 3
jbe@397 473 lua_setfield(L, 2, "message");
jbe@397 474 return 1;
jbe@393 475 }
jbe@393 476 notify = PQnotifies(conn->pgconn);
jbe@393 477 if (notify) {
jbe@397 478 lua_pushnil(L);
jbe@393 479 lua_pushstring(L, notify->relname);
jbe@393 480 lua_pushstring(L, notify->extra);
jbe@393 481 lua_pushinteger(L, notify->be_pid);
jbe@393 482 PQfreemem(notify);
jbe@397 483 return 4;
jbe@393 484 }
jbe@393 485 }
jbe@393 486 if (infinite) {
jbe@393 487 select(fd+1, &fds, NULL, NULL, NULL);
jbe@393 488 } else if (nonblock) {
jbe@393 489 break;
jbe@393 490 } else {
jbe@393 491 struct timespec tp;
jbe@393 492 struct timeval timeout = { 0, };
jbe@393 493 if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
jbe@393 494 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 495 }
jbe@393 496 tp.tv_sec = wakeup.tv_sec - tp.tv_sec;
jbe@393 497 tp.tv_nsec = wakeup.tv_nsec - tp.tv_nsec;
jbe@393 498 if (tp.tv_nsec < 0) {
jbe@393 499 tp.tv_sec -= 1;
jbe@393 500 tp.tv_nsec += 1000000000;
jbe@393 501 }
jbe@393 502 timeout.tv_sec = tp.tv_sec;
jbe@393 503 timeout.tv_usec = (tp.tv_nsec + 500) / 1000;
jbe@393 504 if (
jbe@393 505 timeout.tv_sec < 0 ||
jbe@393 506 (timeout.tv_sec == 0 && timeout.tv_usec == 0)
jbe@393 507 ) break;
jbe@393 508 select(fd+1, &fds, NULL, NULL, &timeout);
jbe@393 509 }
jbe@393 510 }
jbe@397 511 lua_pushnil(L);
jbe@397 512 lua_pushnil(L);
jbe@393 513 return 2;
jbe@393 514 }
jbe@393 515
jbe@23 516 // method "create_list" of database handles:
jbe/bsw@0 517 static int mondelefant_conn_create_list(lua_State *L) {
jbe@23 518 // ensure that first argument is a database connection:
jbe/bsw@0 519 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 520 // if no second argument is given, use an empty table:
jbe@397 521 if (lua_isnoneornil(L, 2)) {
jbe@397 522 lua_settop(L, 1);
jbe@397 523 lua_newtable(L); // 2
jbe@397 524 } else {
jbe@397 525 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 526 lua_settop(L, 2);
jbe/bsw@0 527 }
jbe@23 528 // set meta-table for database result lists/objects:
jbe@406 529 luaL_setmetatable(L, MONDELEFANT_RESULT_MT_REGKEY);
jbe@23 530 // set "_connection" attribute to self:
jbe/bsw@0 531 lua_pushvalue(L, 1); // 3
jbe/bsw@0 532 lua_setfield(L, 2, "_connection");
jbe@23 533 // set "_type" attribute to string "list":
jbe/bsw@0 534 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 535 lua_setfield(L, 2, "_type");
jbe@23 536 // return created database result list:
jbe/bsw@0 537 return 1;
jbe/bsw@0 538 }
jbe/bsw@0 539
jbe@23 540 // method "create_object" of database handles:
jbe/bsw@0 541 static int mondelefant_conn_create_object(lua_State *L) {
jbe@23 542 // ensure that first argument is a database connection:
jbe/bsw@0 543 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 544 // if no second argument is given, use an empty table:
jbe@397 545 if (lua_isnoneornil(L, 2)) {
jbe@397 546 lua_settop(L, 1);
jbe@397 547 lua_newtable(L); // 2
jbe@397 548 } else {
jbe@397 549 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 550 lua_settop(L, 2);
jbe/bsw@0 551 }
jbe@397 552 // set meta-table for database result lists/objects:
jbe@406 553 luaL_setmetatable(L, MONDELEFANT_RESULT_MT_REGKEY);
jbe@23 554 // set "_connection" attribute to self:
jbe/bsw@0 555 lua_pushvalue(L, 1); // 3
jbe/bsw@0 556 lua_setfield(L, 2, "_connection");
jbe@23 557 // set "_type" attribute to string "object":
jbe/bsw@0 558 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 559 lua_setfield(L, 2, "_type"); // "object" or "list"
jbe@23 560 // create empty tables for "_data", "_dirty" and "_ref" attributes:
jbe/bsw@0 561 lua_newtable(L); // 3
jbe/bsw@0 562 lua_setfield(L, 2, "_data");
jbe/bsw@0 563 lua_newtable(L); // 3
jbe/bsw@0 564 lua_setfield(L, 2, "_dirty");
jbe/bsw@0 565 lua_newtable(L); // 3
jbe/bsw@0 566 lua_setfield(L, 2, "_ref"); // nil=no info, false=nil, else table
jbe@23 567 // return created database result object:
jbe/bsw@0 568 return 1;
jbe/bsw@0 569 }
jbe/bsw@0 570
jbe@23 571 // method "quote_string" of database handles:
jbe/bsw@0 572 static int mondelefant_conn_quote_string(lua_State *L) {
jbe/bsw@0 573 mondelefant_conn_t *conn;
jbe/bsw@0 574 const char *input;
jbe/bsw@0 575 size_t input_len;
jbe@407 576 luaL_Buffer buf;
jbe/bsw@0 577 char *output;
jbe/bsw@0 578 size_t output_len;
jbe@407 579 // get database connection object:
jbe/bsw@0 580 conn = mondelefant_get_conn(L, 1);
jbe@23 581 // get second argument, which must be a string:
jbe/bsw@0 582 input = luaL_checklstring(L, 2, &input_len);
jbe@23 583 // throw error, if string is too long:
jbe/bsw@0 584 if (input_len > (SIZE_MAX / sizeof(char) - 3) / 2) {
jbe/bsw@0 585 return luaL_error(L, "String to be escaped is too long.");
jbe/bsw@0 586 }
jbe@23 587 // allocate memory for quoted string:
jbe@407 588 output = luaL_buffinitsize(L, &buf, (2 * input_len + 3) * sizeof(char));
jbe@23 589 // do escaping by calling PQescapeStringConn and enclosing result with
jbe@23 590 // single quotes:
jbe/bsw@0 591 output[0] = '\'';
jbe/bsw@0 592 output_len = PQescapeStringConn(
jbe/bsw@0 593 conn->pgconn, output + 1, input, input_len, NULL
jbe/bsw@0 594 );
jbe/bsw@0 595 output[output_len + 1] = '\'';
jbe/bsw@0 596 output[output_len + 2] = 0;
jbe@23 597 // create Lua string:
jbe@407 598 luaL_addsize(&buf, output_len + 2);
jbe@23 599 // return Lua string:
jbe/bsw@0 600 return 1;
jbe/bsw@0 601 }
jbe/bsw@0 602
jbe@23 603 // method "quote_binary" of database handles:
jbe/bsw@0 604 static int mondelefant_conn_quote_binary(lua_State *L) {
jbe/bsw@0 605 mondelefant_conn_t *conn;
jbe/bsw@0 606 const char *input;
jbe/bsw@0 607 size_t input_len;
jbe/bsw@0 608 char *output;
jbe/bsw@0 609 size_t output_len;
jbe/bsw@0 610 luaL_Buffer buf;
jbe@407 611 // get database connection object:
jbe/bsw@0 612 conn = mondelefant_get_conn(L, 1);
jbe@23 613 // get second argument, which must be a string:
jbe/bsw@0 614 input = luaL_checklstring(L, 2, &input_len);
jbe@408 615 // avoid cumulating memory leaks in case of previous out-of-memory errors:
jbe@408 616 mondelefant_cleanup(conn);
jbe@23 617 // call PQescapeByteaConn, which allocates memory itself:
jbe/bsw@0 618 output = (char *)PQescapeByteaConn(
jbe/bsw@0 619 conn->pgconn, (const unsigned char *)input, input_len, &output_len
jbe/bsw@0 620 );
jbe/bsw@0 621 if (!output) {
jbe@408 622 lua_gc(L, LUA_GCCOLLECT, 0);
jbe@408 623 output = (char *)PQescapeByteaConn(
jbe@408 624 conn->pgconn, (const unsigned char *)input, input_len, &output_len
jbe@408 625 );
jbe@408 626 if (!output) {
jbe@408 627 return luaL_error(L, "Could not allocate memory for binary quoting.");
jbe@408 628 }
jbe/bsw@0 629 }
jbe@408 630 // ensure call of PQfreemem in case of unexpected out-of-memory error:
jbe@408 631 conn->todo_PQfreemem = output;
jbe@23 632 // create Lua string enclosed by single quotes:
jbe/bsw@0 633 luaL_buffinit(L, &buf);
jbe/bsw@0 634 luaL_addchar(&buf, '\'');
jbe/bsw@0 635 luaL_addlstring(&buf, output, output_len - 1);
jbe/bsw@0 636 luaL_addchar(&buf, '\'');
jbe/bsw@0 637 luaL_pushresult(&buf);
jbe@23 638 // free memory allocated by PQescapeByteaConn:
jbe/bsw@0 639 PQfreemem(output);
jbe@408 640 // avoid double call of PQfreemem later:
jbe@408 641 conn->todo_PQfreemem = NULL;
jbe@23 642 // return Lua string:
jbe/bsw@0 643 return 1;
jbe/bsw@0 644 }
jbe/bsw@0 645
jbe@23 646 // method "assemble_command" of database handles:
jbe/bsw@0 647 static int mondelefant_conn_assemble_command(lua_State *L) {
jbe/bsw@0 648 mondelefant_conn_t *conn;
jbe/bsw@0 649 int paramidx = 2;
jbe/bsw@0 650 const char *template;
jbe/bsw@0 651 size_t template_pos = 0;
jbe/bsw@0 652 luaL_Buffer buf;
jbe@407 653 // get database connection object:
jbe/bsw@0 654 conn = mondelefant_get_conn(L, 1);
jbe@23 655 // if second argument is a string, return this string:
jbe@397 656 if (lua_type(L, 2) == LUA_TSTRING) {
jbe@397 657 lua_settop(L, 2);
jbe/bsw@0 658 return 1;
jbe/bsw@0 659 }
jbe@23 660 // if second argument has __tostring meta-method,
jbe@23 661 // then use this method and return its result:
jbe/bsw@0 662 if (luaL_callmeta(L, 2, "__tostring")) return 1;
jbe@23 663 // otherwise, require that second argument is a table:
jbe/bsw@0 664 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 665 // set stack top:
jbe@397 666 lua_settop(L, 2);
jbe@23 667 // get first element of table, which must be a string:
jbe/bsw@0 668 lua_rawgeti(L, 2, 1); // 3
jbe/bsw@0 669 luaL_argcheck(L,
jbe/bsw@0 670 lua_isstring(L, 3),
jbe/bsw@0 671 2,
jbe/bsw@0 672 "First entry of SQL command structure is not a string."
jbe/bsw@0 673 );
jbe/bsw@0 674 template = lua_tostring(L, 3);
jbe@23 675 // get value of "input_converter" attribute of database connection:
jbe/bsw@0 676 lua_pushliteral(L, "input_converter"); // 4
jbe/bsw@0 677 lua_gettable(L, 1); // input_converter at stack position 4
jbe@23 678 // reserve space on Lua stack:
jbe/bsw@0 679 lua_pushnil(L); // free space at stack position 5
jbe/bsw@0 680 lua_pushnil(L); // free space at stack position 6
jbe@23 681 // initialize Lua buffer for result string:
jbe/bsw@0 682 luaL_buffinit(L, &buf);
jbe@23 683 // fill buffer in loop:
jbe/bsw@0 684 while (1) {
jbe@23 685 // variable declaration:
jbe/bsw@0 686 char c;
jbe@23 687 // get next character:
jbe/bsw@0 688 c = template[template_pos++];
jbe@23 689 // break, when character is NULL byte:
jbe/bsw@0 690 if (!c) break;
jbe@23 691 // question-mark and dollar-sign are special characters:
jbe@23 692 if (c == '?' || c == '$') { // special character found
jbe@23 693 // check, if same character follows:
jbe@23 694 if (template[template_pos] == c) { // special character is escaped
jbe@23 695 // consume two characters of input and add one character to buffer:
jbe/bsw@0 696 template_pos++;
jbe/bsw@0 697 luaL_addchar(&buf, c);
jbe@23 698 } else { // special character is not escaped
jbe/bsw@0 699 luaL_Buffer keybuf;
jbe/bsw@0 700 int subcmd;
jbe@23 701 // set 'subcmd' = true, if special character was a dollar-sign,
jbe@23 702 // set 'subcmd' = false, if special character was a question-mark:
jbe/bsw@0 703 subcmd = (c == '$');
jbe@23 704 // read any number of alpha numeric chars or underscores
jbe@23 705 // and store them on Lua stack:
jbe/bsw@0 706 luaL_buffinit(L, &keybuf);
jbe/bsw@0 707 while (1) {
jbe/bsw@0 708 c = template[template_pos];
jbe/bsw@0 709 if (
jbe/bsw@0 710 (c < 'A' || c > 'Z') &&
jbe/bsw@0 711 (c < 'a' || c > 'z') &&
jbe/bsw@0 712 (c < '0' || c > '9') &&
jbe/bsw@0 713 (c != '_')
jbe/bsw@0 714 ) break;
jbe/bsw@0 715 luaL_addchar(&keybuf, c);
jbe/bsw@0 716 template_pos++;
jbe/bsw@0 717 }
jbe/bsw@0 718 luaL_pushresult(&keybuf);
jbe@23 719 // check, if any characters matched:
jbe@64 720 if (lua_rawlen(L, -1)) {
jbe@23 721 // if any alpha numeric chars or underscores were found,
jbe@23 722 // push them on stack as a Lua string and use them to lookup
jbe@23 723 // value from second argument:
jbe/bsw@0 724 lua_pushvalue(L, -1); // save key on stack
jbe@23 725 lua_gettable(L, 2); // fetch value (raw-value)
jbe/bsw@0 726 } else {
jbe@23 727 // otherwise push nil and use numeric lookup based on 'paramidx':
jbe/bsw@0 728 lua_pop(L, 1);
jbe/bsw@0 729 lua_pushnil(L); // put nil on key position
jbe@23 730 lua_rawgeti(L, 2, paramidx++); // fetch value (raw-value)
jbe/bsw@0 731 }
jbe@23 732 // Lua stack contains: ..., <buffer>, key, raw-value
jbe@23 733 // branch according to type of special character ("?" or "$"):
jbe@23 734 if (subcmd) { // dollar-sign
jbe/bsw@0 735 size_t i;
jbe/bsw@0 736 size_t count;
jbe@23 737 // store fetched value (which is supposed to be sub-structure)
jbe@23 738 // on Lua stack position 5 and drop key:
jbe@23 739 lua_replace(L, 5);
jbe@23 740 lua_pop(L, 1);
jbe@23 741 // Lua stack contains: ..., <buffer>
jbe@23 742 // check, if fetched value is really a sub-structure:
jbe/bsw@0 743 luaL_argcheck(L,
jbe/bsw@0 744 !lua_isnil(L, 5),
jbe/bsw@0 745 2,
jbe/bsw@0 746 "SQL sub-structure not found."
jbe/bsw@0 747 );
jbe/bsw@0 748 luaL_argcheck(L,
jbe/bsw@0 749 lua_type(L, 5) == LUA_TTABLE,
jbe/bsw@0 750 2,
jbe/bsw@0 751 "SQL sub-structure must be a table."
jbe/bsw@0 752 );
jbe@23 753 // Lua stack contains: ..., <buffer>
jbe@23 754 // get value of "sep" attribute of sub-structure,
jbe@23 755 // and place it on Lua stack position 6:
jbe/bsw@0 756 lua_getfield(L, 5, "sep");
jbe@23 757 lua_replace(L, 6);
jbe@23 758 // if seperator is nil, then use ", " as default,
jbe@23 759 // if seperator is neither nil nor a string, then throw error:
jbe/bsw@0 760 if (lua_isnil(L, 6)) {
jbe/bsw@0 761 lua_pushstring(L, ", ");
jbe/bsw@0 762 lua_replace(L, 6);
jbe/bsw@0 763 } else {
jbe/bsw@0 764 luaL_argcheck(L,
jbe/bsw@0 765 lua_isstring(L, 6),
jbe/bsw@0 766 2,
jbe/bsw@0 767 "Seperator of SQL sub-structure has to be a string."
jbe/bsw@0 768 );
jbe/bsw@0 769 }
jbe@23 770 // iterate over items of sub-structure:
jbe@64 771 count = lua_rawlen(L, 5);
jbe/bsw@0 772 for (i = 0; i < count; i++) {
jbe@23 773 // add seperator, unless this is the first run:
jbe/bsw@0 774 if (i) {
jbe/bsw@0 775 lua_pushvalue(L, 6);
jbe/bsw@0 776 luaL_addvalue(&buf);
jbe/bsw@0 777 }
jbe@23 778 // recursivly apply assemble function and add results to buffer:
jbe/bsw@0 779 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 780 lua_pushvalue(L, 1);
jbe/bsw@0 781 lua_rawgeti(L, 5, i+1);
jbe/bsw@0 782 lua_call(L, 2, 1);
jbe/bsw@0 783 luaL_addvalue(&buf);
jbe/bsw@0 784 }
jbe@23 785 } else { // question-mark
jbe/bsw@0 786 if (lua_toboolean(L, 4)) {
jbe@23 787 // call input_converter with connection handle, raw-value and
jbe@23 788 // an info-table which contains a "field_name" entry with the
jbe@23 789 // used key:
jbe/bsw@0 790 lua_pushvalue(L, 4);
jbe/bsw@0 791 lua_pushvalue(L, 1);
jbe/bsw@0 792 lua_pushvalue(L, -3);
jbe/bsw@0 793 lua_newtable(L);
jbe/bsw@0 794 lua_pushvalue(L, -6);
jbe/bsw@0 795 lua_setfield(L, -2, "field_name");
jbe/bsw@0 796 lua_call(L, 3, 1);
jbe@23 797 // Lua stack contains: ..., <buffer>, key, raw-value, final-value
jbe@23 798 // remove key and raw-value:
jbe/bsw@0 799 lua_remove(L, -2);
jbe/bsw@0 800 lua_remove(L, -2);
jbe@23 801 // Lua stack contains: ..., <buffer>, final-value
jbe@23 802 // throw error, if final-value is not a string:
jbe/bsw@0 803 if (!lua_isstring(L, -1)) {
jbe/bsw@0 804 return luaL_error(L, "input_converter returned non-string.");
jbe/bsw@0 805 }
jbe/bsw@0 806 } else {
jbe@23 807 // remove key from stack:
jbe/bsw@0 808 lua_remove(L, -2);
jbe@23 809 // Lua stack contains: ..., <buffer>, raw-value
jbe@23 810 // branch according to type of value:
jbe@408 811 // NOTE: Lua automatically converts numbers to strings
jbe@23 812 if (lua_isnil(L, -1)) { // value is nil
jbe@23 813 // push string "NULL" to stack:
jbe/bsw@0 814 lua_pushliteral(L, "NULL");
jbe@23 815 } else if (lua_type(L, -1) == LUA_TBOOLEAN) { // value is boolean
jbe@23 816 // push strings "TRUE" or "FALSE" to stack:
jbe/bsw@0 817 lua_pushstring(L, lua_toboolean(L, -1) ? "TRUE" : "FALSE");
jbe@23 818 } else if (lua_isstring(L, -1)) { // value is string or number
jbe@408 819 // push output of "quote_string" method of database connection
jbe@408 820 // to stack:
jbe/bsw@0 821 lua_tostring(L, -1);
jbe/bsw@0 822 lua_pushcfunction(L, mondelefant_conn_quote_string);
jbe/bsw@0 823 lua_pushvalue(L, 1);
jbe/bsw@0 824 lua_pushvalue(L, -3);
jbe/bsw@0 825 lua_call(L, 2, 1);
jbe@23 826 } else { // value is of other type
jbe@23 827 // throw error:
jbe/bsw@0 828 return luaL_error(L,
jbe/bsw@0 829 "Unable to convert SQL value due to unknown type "
jbe/bsw@0 830 "or missing input_converter."
jbe/bsw@0 831 );
jbe/bsw@0 832 }
jbe@23 833 // Lua stack contains: ..., <buffer>, raw-value, final-value
jbe@23 834 // remove raw-value:
jbe/bsw@0 835 lua_remove(L, -2);
jbe@23 836 // Lua stack contains: ..., <buffer>, final-value
jbe/bsw@0 837 }
jbe@23 838 // append final-value to buffer:
jbe/bsw@0 839 luaL_addvalue(&buf);
jbe/bsw@0 840 }
jbe/bsw@0 841 }
jbe@23 842 } else { // character is not special
jbe@23 843 // just copy character:
jbe/bsw@0 844 luaL_addchar(&buf, c);
jbe/bsw@0 845 }
jbe/bsw@0 846 }
jbe@23 847 // return string in buffer:
jbe/bsw@0 848 luaL_pushresult(&buf);
jbe/bsw@0 849 return 1;
jbe/bsw@0 850 }
jbe/bsw@0 851
jbe@23 852 // max number of SQL statements executed by one "query" method call:
jbe/bsw@0 853 #define MONDELEFANT_MAX_COMMAND_COUNT 64
jbe@23 854 // max number of columns in a database result:
jbe/bsw@0 855 #define MONDELEFANT_MAX_COLUMN_COUNT 1024
jbe@23 856 // enum values for 'modes' array in C-function below:
jbe/bsw@0 857 #define MONDELEFANT_QUERY_MODE_LIST 1
jbe/bsw@0 858 #define MONDELEFANT_QUERY_MODE_OBJECT 2
jbe/bsw@0 859 #define MONDELEFANT_QUERY_MODE_OPT_OBJECT 3
jbe/bsw@0 860
jbe@23 861 // method "try_query" of database handles:
jbe/bsw@0 862 static int mondelefant_conn_try_query(lua_State *L) {
jbe/bsw@0 863 mondelefant_conn_t *conn;
jbe/bsw@0 864 int command_count;
jbe/bsw@0 865 int command_idx;
jbe/bsw@0 866 int modes[MONDELEFANT_MAX_COMMAND_COUNT];
jbe/bsw@0 867 luaL_Buffer buf;
jbe/bsw@0 868 int sent_success;
jbe/bsw@0 869 PGresult *res;
jbe/bsw@0 870 int rows, cols, row, col;
jbe@407 871 // get database connection object:
jbe/bsw@0 872 conn = mondelefant_get_conn(L, 1);
jbe@23 873 // calculate number of commands (2 arguments for one command):
jbe/bsw@0 874 command_count = lua_gettop(L) / 2;
jbe@23 875 // push nil on stack, which is needed, if last mode was ommitted:
jbe@23 876 lua_pushnil(L);
jbe@23 877 // throw error, if number of commands is too high:
jbe/bsw@0 878 if (command_count > MONDELEFANT_MAX_COMMAND_COUNT) {
jbe/bsw@0 879 return luaL_error(L, "Exceeded maximum command count in one query.");
jbe/bsw@0 880 }
jbe@23 881 // create SQL string, store query modes and push SQL string on stack:
jbe/bsw@0 882 luaL_buffinit(L, &buf);
jbe/bsw@0 883 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 884 int mode;
jbe/bsw@0 885 int mode_idx; // stack index of mode string
jbe/bsw@0 886 if (command_idx) luaL_addchar(&buf, ' ');
jbe/bsw@0 887 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 888 lua_pushvalue(L, 1);
jbe/bsw@0 889 lua_pushvalue(L, 2 + 2 * command_idx);
jbe/bsw@0 890 lua_call(L, 2, 1);
jbe/bsw@0 891 luaL_addvalue(&buf);
jbe/bsw@0 892 luaL_addchar(&buf, ';');
jbe/bsw@0 893 mode_idx = 3 + 2 * command_idx;
jbe/bsw@0 894 if (lua_isnil(L, mode_idx)) {
jbe/bsw@0 895 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 896 } else {
jbe/bsw@0 897 const char *modestr;
jbe/bsw@0 898 modestr = luaL_checkstring(L, mode_idx);
jbe/bsw@0 899 if (!strcmp(modestr, "list")) {
jbe/bsw@0 900 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 901 } else if (!strcmp(modestr, "object")) {
jbe/bsw@0 902 mode = MONDELEFANT_QUERY_MODE_OBJECT;
jbe/bsw@0 903 } else if (!strcmp(modestr, "opt_object")) {
jbe/bsw@0 904 mode = MONDELEFANT_QUERY_MODE_OPT_OBJECT;
jbe/bsw@0 905 } else {
jbe@397 906 return luaL_argerror(L, mode_idx, "unknown query mode");
jbe/bsw@0 907 }
jbe/bsw@0 908 }
jbe/bsw@0 909 modes[command_idx] = mode;
jbe/bsw@0 910 }
jbe/bsw@0 911 luaL_pushresult(&buf); // stack position unknown
jbe/bsw@0 912 lua_replace(L, 2); // SQL command string to stack position 2
jbe@23 913 // call sql_tracer, if set:
jbe/bsw@0 914 lua_settop(L, 2);
jbe/bsw@0 915 lua_getfield(L, 1, "sql_tracer"); // tracer at stack position 3
jbe/bsw@0 916 if (lua_toboolean(L, 3)) {
jbe/bsw@0 917 lua_pushvalue(L, 1); // 4
jbe/bsw@0 918 lua_pushvalue(L, 2); // 5
jbe/bsw@0 919 lua_call(L, 2, 1); // trace callback at stack position 3
jbe/bsw@0 920 }
jbe@23 921 // NOTE: If no tracer was found, then nil or false is stored at stack
jbe@23 922 // position 3.
jbe@23 923 // call PQsendQuery function and store result in 'sent_success' variable:
jbe/bsw@0 924 sent_success = PQsendQuery(conn->pgconn, lua_tostring(L, 2));
jbe@23 925 // create preliminary result table:
jbe/bsw@0 926 lua_newtable(L); // results in table at stack position 4
jbe@23 927 // iterate over results using function PQgetResult to fill result table:
jbe/bsw@0 928 for (command_idx = 0; ; command_idx++) {
jbe/bsw@0 929 int mode;
jbe/bsw@0 930 char binary[MONDELEFANT_MAX_COLUMN_COUNT];
jbe/bsw@0 931 ExecStatusType pgstatus;
jbe@23 932 // fetch mode which was given for the command:
jbe/bsw@0 933 mode = modes[command_idx];
jbe@23 934 // if PQsendQuery call was successful, then fetch result data:
jbe/bsw@0 935 if (sent_success) {
jbe@408 936 // avoid cumulating memory leaks in case of previous out-of-memory errors:
jbe@408 937 mondelefant_cleanup(conn);
jbe@23 938 // NOTE: PQgetResult called one extra time. Break only, if all
jbe@23 939 // queries have been processed and PQgetResult returned NULL.
jbe/bsw@0 940 res = PQgetResult(conn->pgconn);
jbe/bsw@0 941 if (command_idx >= command_count && !res) break;
jbe/bsw@0 942 if (res) {
jbe/bsw@0 943 pgstatus = PQresultStatus(res);
jbe/bsw@0 944 rows = PQntuples(res);
jbe/bsw@0 945 cols = PQnfields(res);
jbe@408 946 // ensure eventual call of PQclear in case of unexpected Lua errors:
jbe@408 947 conn->todo_PQclear = 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@406 960 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe/bsw@0 961 lua_pushvalue(L, 1);
jbe/bsw@0 962 lua_setfield(L, 5, "connection");
jbe/bsw@0 963 lua_pushvalue(L, 2);
jbe/bsw@0 964 lua_setfield(L, 5, "sql_command");
jbe@397 965 if (!sent_success) {
jbe@397 966 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe/bsw@0 967 lua_setfield(L, 5, "code");
jbe@397 968 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn));
jbe/bsw@0 969 lua_setfield(L, 5, "message");
jbe/bsw@0 970 } else {
jbe@397 971 lua_pushinteger(L, command_idx + 1);
jbe@397 972 lua_setfield(L, 5, "command_number");
jbe@397 973 if (!res) {
jbe@397 974 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_LOW);
jbe@397 975 lua_setfield(L, 5, "code");
jbe@397 976 lua_pushliteral(L, "Received too few database result sets.");
jbe@397 977 lua_setfield(L, 5, "message");
jbe@397 978 } else if (command_idx >= command_count) {
jbe@397 979 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH);
jbe@397 980 lua_setfield(L, 5, "code");
jbe@397 981 lua_pushliteral(L, "Received too many database result sets.");
jbe@397 982 lua_setfield(L, 5, "message");
jbe@397 983 } else if (
jbe@397 984 pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK
jbe@397 985 ) {
jbe@397 986 const char *sqlstate;
jbe@397 987 const char *errmsg;
jbe@397 988 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SEVERITY));
jbe@397 989 lua_setfield(L, 5, "pg_severity");
jbe@397 990 sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
jbe@397 991 if (sqlstate) {
jbe@397 992 lua_pushstring(L, sqlstate);
jbe@397 993 lua_setfield(L, 5, "pg_sqlstate");
jbe@397 994 lua_pushstring(L, mondelefant_translate_errcode(sqlstate));
jbe@397 995 lua_setfield(L, 5, "code");
jbe@397 996 } else {
jbe@397 997 lua_pushliteral(L, MONDELEFANT_ERRCODE_UNKNOWN);
jbe@397 998 lua_setfield(L, 5, "code");
jbe@397 999 }
jbe@397 1000 errmsg = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
jbe@397 1001 if (errmsg) {
jbe@397 1002 mondelefant_push_first_line(L, errmsg);
jbe@397 1003 lua_setfield(L, 5, "message");
jbe@397 1004 lua_pushstring(L, errmsg);
jbe@397 1005 lua_setfield(L, 5, "pg_message_primary");
jbe@397 1006 } else {
jbe@397 1007 lua_pushliteral(L,
jbe@397 1008 "Error while fetching result, but no error message given."
jbe@397 1009 );
jbe@397 1010 lua_setfield(L, 5, "message");
jbe@397 1011 }
jbe@397 1012 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL));
jbe@397 1013 lua_setfield(L, 5, "pg_message_detail");
jbe@397 1014 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_HINT));
jbe@397 1015 lua_setfield(L, 5, "pg_message_hint");
jbe@397 1016 // NOTE: "position" and "pg_internal_position" are recalculated to
jbe@397 1017 // byte offsets, as Lua 5.2 is not Unicode aware.
jbe@397 1018 {
jbe@397 1019 char *tmp;
jbe@397 1020 tmp = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
jbe@397 1021 if (tmp) {
jbe@397 1022 int pos;
jbe@397 1023 pos = atoi(tmp) - 1;
jbe@397 1024 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1025 pos = utf8_position_to_byte(command, pos);
jbe@397 1026 }
jbe@397 1027 lua_pushinteger(L, pos + 1);
jbe@397 1028 lua_setfield(L, 5, "position");
jbe@397 1029 }
jbe@397 1030 }
jbe@397 1031 {
jbe@397 1032 const char *internal_query;
jbe@397 1033 internal_query = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
jbe@397 1034 lua_pushstring(L, internal_query);
jbe@397 1035 lua_setfield(L, 5, "pg_internal_query");
jbe@397 1036 char *tmp;
jbe@397 1037 tmp = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
jbe@397 1038 if (tmp) {
jbe@397 1039 int pos;
jbe@397 1040 pos = atoi(tmp) - 1;
jbe@397 1041 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1042 pos = utf8_position_to_byte(internal_query, pos);
jbe@397 1043 }
jbe@397 1044 lua_pushinteger(L, pos + 1);
jbe@397 1045 lua_setfield(L, 5, "pg_internal_position");
jbe@397 1046 }
jbe@397 1047 }
jbe@397 1048 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_CONTEXT));
jbe@397 1049 lua_setfield(L, 5, "pg_context");
jbe@397 1050 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FILE));
jbe@397 1051 lua_setfield(L, 5, "pg_source_file");
jbe@397 1052 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_LINE));
jbe@397 1053 lua_setfield(L, 5, "pg_source_line");
jbe@397 1054 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION));
jbe@397 1055 lua_setfield(L, 5, "pg_source_function");
jbe@397 1056 } else if (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) {
jbe@397 1057 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_NO_ROWS);
jbe@397 1058 lua_setfield(L, 5, "code");
jbe@397 1059 lua_pushliteral(L, "Expected one row, but got empty set.");
jbe@397 1060 lua_setfield(L, 5, "message");
jbe@397 1061 } else if (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST) {
jbe@397 1062 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS);
jbe@397 1063 lua_setfield(L, 5, "code");
jbe@397 1064 lua_pushliteral(L, "Got more than one result row.");
jbe@397 1065 lua_setfield(L, 5, "message");
jbe@397 1066 } else {
jbe@397 1067 // should not happen
jbe@397 1068 abort();
jbe@397 1069 }
jbe@397 1070 if (res) {
jbe@397 1071 PQclear(res);
jbe@397 1072 while ((res = PQgetResult(conn->pgconn))) PQclear(res);
jbe@408 1073 // avoid double call of PQclear later:
jbe@408 1074 conn->todo_PQclear = NULL;
jbe@397 1075 }
jbe/bsw@0 1076 }
jbe/bsw@0 1077 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1078 lua_pushvalue(L, 3);
jbe/bsw@0 1079 lua_pushvalue(L, 5);
jbe/bsw@0 1080 lua_call(L, 1, 0);
jbe/bsw@0 1081 }
jbe/bsw@0 1082 return 1;
jbe/bsw@0 1083 }
jbe@23 1084 // call "create_list" or "create_object" method of database handle,
jbe@23 1085 // result will be at stack position 5:
jbe/bsw@0 1086 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1087 lua_pushcfunction(L, mondelefant_conn_create_list); // 5
jbe/bsw@0 1088 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1089 lua_call(L, 1, 1); // 5
jbe/bsw@0 1090 } else {
jbe/bsw@0 1091 lua_pushcfunction(L, mondelefant_conn_create_object); // 5
jbe/bsw@0 1092 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1093 lua_call(L, 1, 1); // 5
jbe/bsw@0 1094 }
jbe@23 1095 // set "_column_info":
jbe@23 1096 lua_newtable(L); // 6
jbe/bsw@0 1097 for (col = 0; col < cols; col++) {
jbe/bsw@0 1098 lua_newtable(L); // 7
jbe@380 1099 lua_pushstring(L, PQfname(res, col)); // 8
jbe@380 1100 lua_pushvalue(L, 8); // 9
jbe@380 1101 lua_pushvalue(L, 7); // 10
jbe@380 1102 lua_rawset(L, 6);
jbe/bsw@0 1103 lua_setfield(L, 7, "field_name");
jbe@380 1104 // _column_info entry (for current column) on stack position 7
jbe/bsw@0 1105 {
jbe/bsw@0 1106 Oid tmp;
jbe/bsw@0 1107 tmp = PQftable(res, col);
jbe/bsw@0 1108 if (tmp == InvalidOid) lua_pushnil(L);
jbe/bsw@0 1109 else lua_pushinteger(L, tmp);
jbe/bsw@0 1110 lua_setfield(L, 7, "table_oid");
jbe/bsw@0 1111 }
jbe/bsw@0 1112 {
jbe/bsw@0 1113 int tmp;
jbe/bsw@0 1114 tmp = PQftablecol(res, col);
jbe/bsw@0 1115 if (tmp == 0) lua_pushnil(L);
jbe/bsw@0 1116 else lua_pushinteger(L, tmp);
jbe/bsw@0 1117 lua_setfield(L, 7, "table_column_number");
jbe/bsw@0 1118 }
jbe/bsw@0 1119 {
jbe/bsw@0 1120 Oid tmp;
jbe/bsw@0 1121 tmp = PQftype(res, col);
jbe/bsw@0 1122 binary[col] = (tmp == MONDELEFANT_POSTGRESQL_BINARY_OID);
jbe/bsw@0 1123 lua_pushinteger(L, tmp);
jbe/bsw@0 1124 lua_setfield(L, 7, "type_oid");
jbe/bsw@0 1125 lua_pushstring(L, mondelefant_oid_to_typestr(tmp));
jbe/bsw@0 1126 lua_setfield(L, 7, "type");
jbe/bsw@0 1127 }
jbe/bsw@0 1128 {
jbe/bsw@0 1129 int tmp;
jbe/bsw@0 1130 tmp = PQfmod(res, col);
jbe/bsw@0 1131 if (tmp == -1) lua_pushnil(L);
jbe/bsw@0 1132 else lua_pushinteger(L, tmp);
jbe/bsw@0 1133 lua_setfield(L, 7, "type_modifier");
jbe/bsw@0 1134 }
jbe/bsw@0 1135 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1136 }
jbe@23 1137 lua_setfield(L, 5, "_column_info");
jbe@23 1138 // set "_rows_affected":
jbe/bsw@0 1139 {
jbe/bsw@0 1140 char *tmp;
jbe/bsw@0 1141 tmp = PQcmdTuples(res);
jbe/bsw@0 1142 if (tmp[0]) {
jbe/bsw@0 1143 lua_pushinteger(L, atoi(tmp));
jbe/bsw@0 1144 lua_setfield(L, 5, "_rows_affected");
jbe/bsw@0 1145 }
jbe/bsw@0 1146 }
jbe@23 1147 // set "_oid":
jbe/bsw@0 1148 {
jbe/bsw@0 1149 Oid tmp;
jbe/bsw@0 1150 tmp = PQoidValue(res);
jbe/bsw@0 1151 if (tmp != InvalidOid) {
jbe/bsw@0 1152 lua_pushinteger(L, tmp);
jbe/bsw@0 1153 lua_setfield(L, 5, "_oid");
jbe/bsw@0 1154 }
jbe/bsw@0 1155 }
jbe@23 1156 // copy data as strings or nil, while performing binary unescaping
jbe@23 1157 // automatically:
jbe/bsw@0 1158 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1159 for (row = 0; row < rows; row++) {
jbe/bsw@0 1160 lua_pushcfunction(L, mondelefant_conn_create_object); // 6
jbe/bsw@0 1161 lua_pushvalue(L, 1); // 7
jbe/bsw@0 1162 lua_call(L, 1, 1); // 6
jbe/bsw@0 1163 for (col = 0; col < cols; col++) {
jbe/bsw@0 1164 if (PQgetisnull(res, row, col)) {
jbe/bsw@0 1165 lua_pushnil(L);
jbe/bsw@0 1166 } else if (binary[col]) {
jbe/bsw@0 1167 size_t binlen;
jbe/bsw@0 1168 char *binval;
jbe/bsw@0 1169 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1170 (unsigned char *)PQgetvalue(res, row, col), &binlen
jbe/bsw@0 1171 );
jbe/bsw@0 1172 if (!binval) {
jbe/bsw@0 1173 return luaL_error(L,
jbe/bsw@0 1174 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1175 );
jbe/bsw@0 1176 }
jbe/bsw@0 1177 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1178 PQfreemem(binval);
jbe/bsw@0 1179 } else {
jbe/bsw@0 1180 lua_pushstring(L, PQgetvalue(res, row, col));
jbe/bsw@0 1181 }
jbe/bsw@0 1182 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1183 }
jbe/bsw@0 1184 lua_rawseti(L, 5, row+1);
jbe/bsw@0 1185 }
jbe/bsw@0 1186 } else if (rows == 1) {
jbe/bsw@0 1187 for (col = 0; col < cols; col++) {
jbe/bsw@0 1188 if (PQgetisnull(res, 0, col)) {
jbe/bsw@0 1189 lua_pushnil(L);
jbe/bsw@0 1190 } else if (binary[col]) {
jbe/bsw@0 1191 size_t binlen;
jbe/bsw@0 1192 char *binval;
jbe/bsw@0 1193 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1194 (unsigned char *)PQgetvalue(res, 0, col), &binlen
jbe/bsw@0 1195 );
jbe/bsw@0 1196 if (!binval) {
jbe/bsw@0 1197 return luaL_error(L,
jbe/bsw@0 1198 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1199 );
jbe/bsw@0 1200 }
jbe/bsw@0 1201 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1202 PQfreemem(binval);
jbe/bsw@0 1203 } else {
jbe/bsw@0 1204 lua_pushstring(L, PQgetvalue(res, 0, col));
jbe/bsw@0 1205 }
jbe/bsw@0 1206 lua_rawseti(L, 5, col+1);
jbe/bsw@0 1207 }
jbe/bsw@0 1208 } else {
jbe/bsw@0 1209 // no row in optrow mode
jbe/bsw@0 1210 lua_pop(L, 1);
jbe/bsw@0 1211 lua_pushnil(L);
jbe/bsw@0 1212 }
jbe@23 1213 // save result in result list:
jbe/bsw@0 1214 lua_rawseti(L, 4, command_idx+1);
jbe@23 1215 // extra assertion:
jbe/bsw@0 1216 if (lua_gettop(L) != 4) abort(); // should not happen
jbe@23 1217 // free memory acquired by libpq:
jbe/bsw@0 1218 PQclear(res);
jbe@408 1219 // avoid double call of PQclear later:
jbe@408 1220 conn->todo_PQclear = NULL;
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@406 1422 luaL_setmetatable(L, MONDELEFANT_CLASS_MT_REGKEY);
jbe@23 1423 // check, if "prototype" attribute is not set:
jbe/bsw@0 1424 lua_pushliteral(L, "prototype"); // 2
jbe/bsw@0 1425 lua_rawget(L, 1); // 2
jbe/bsw@0 1426 if (!lua_toboolean(L, 2)) {
jbe@23 1427 // set "prototype" attribute to default prototype:
jbe/bsw@0 1428 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1429 lua_getfield(L,
jbe/bsw@0 1430 LUA_REGISTRYINDEX,
jbe/bsw@0 1431 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1432 ); // 4
jbe/bsw@0 1433 lua_rawset(L, 1);
jbe/bsw@0 1434 }
jbe@23 1435 // set "object" attribute to empty table, unless it is already set:
jbe/bsw@0 1436 lua_settop(L, 1);
jbe/bsw@0 1437 lua_pushliteral(L, "object"); // 2
jbe/bsw@0 1438 lua_rawget(L, 1); // 2
jbe/bsw@0 1439 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1440 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 1441 lua_newtable(L); // 4
jbe/bsw@0 1442 lua_rawset(L, 1);
jbe/bsw@0 1443 }
jbe@23 1444 // set "object_get" attribute to empty table, unless it is already set:
jbe/bsw@0 1445 lua_settop(L, 1);
jbe/bsw@0 1446 lua_pushliteral(L, "object_get"); // 2
jbe/bsw@0 1447 lua_rawget(L, 1); // 2
jbe/bsw@0 1448 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1449 lua_pushliteral(L, "object_get"); // 3
jbe/bsw@0 1450 lua_newtable(L); // 4
jbe/bsw@0 1451 lua_rawset(L, 1);
jbe/bsw@0 1452 }
jbe@23 1453 // set "object_set" attribute to empty table, unless it is already set:
jbe/bsw@0 1454 lua_settop(L, 1);
jbe/bsw@0 1455 lua_pushliteral(L, "object_set"); // 2
jbe/bsw@0 1456 lua_rawget(L, 1); // 2
jbe/bsw@0 1457 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1458 lua_pushliteral(L, "object_set"); // 3
jbe/bsw@0 1459 lua_newtable(L); // 4
jbe/bsw@0 1460 lua_rawset(L, 1);
jbe/bsw@0 1461 }
jbe@23 1462 // set "list" attribute to empty table, unless it is already set:
jbe/bsw@0 1463 lua_settop(L, 1);
jbe/bsw@0 1464 lua_pushliteral(L, "list"); // 2
jbe/bsw@0 1465 lua_rawget(L, 1); // 2
jbe/bsw@0 1466 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1467 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 1468 lua_newtable(L); // 4
jbe/bsw@0 1469 lua_rawset(L, 1);
jbe/bsw@0 1470 }
jbe@23 1471 // set "references" attribute to empty table, unless it is already set:
jbe/bsw@0 1472 lua_settop(L, 1);
jbe/bsw@0 1473 lua_pushliteral(L, "references"); // 2
jbe/bsw@0 1474 lua_rawget(L, 1); // 2
jbe/bsw@0 1475 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1476 lua_pushliteral(L, "references"); // 3
jbe/bsw@0 1477 lua_newtable(L); // 4
jbe/bsw@0 1478 lua_rawset(L, 1);
jbe/bsw@0 1479 }
jbe@23 1480 // set "foreign_keys" attribute to empty table, unless it is already set:
jbe/bsw@0 1481 lua_settop(L, 1);
jbe/bsw@0 1482 lua_pushliteral(L, "foreign_keys"); // 2
jbe/bsw@0 1483 lua_rawget(L, 1); // 2
jbe/bsw@0 1484 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1485 lua_pushliteral(L, "foreign_keys"); // 3
jbe/bsw@0 1486 lua_newtable(L); // 4
jbe/bsw@0 1487 lua_rawset(L, 1);
jbe/bsw@0 1488 }
jbe@23 1489 // return table:
jbe/bsw@0 1490 lua_settop(L, 1);
jbe/bsw@0 1491 return 1;
jbe/bsw@0 1492 }
jbe/bsw@0 1493
jbe@23 1494 // method "get_reference" of classes (models):
jbe/bsw@0 1495 static int mondelefant_class_get_reference(lua_State *L) {
jbe/bsw@0 1496 lua_settop(L, 2);
jbe/bsw@0 1497 while (lua_toboolean(L, 1)) {
jbe@23 1498 // get "references" table:
jbe/bsw@0 1499 lua_getfield(L, 1, "references"); // 3
jbe@23 1500 // perform lookup:
jbe/bsw@0 1501 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1502 lua_gettable(L, 3); // 4
jbe@23 1503 // return result, if lookup was successful:
jbe/bsw@0 1504 if (!lua_isnil(L, 4)) return 1;
jbe@23 1505 // replace current table by its prototype:
jbe/bsw@0 1506 lua_settop(L, 2);
jbe/bsw@0 1507 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1508 lua_rawget(L, 1); // 3
jbe/bsw@0 1509 lua_replace(L, 1);
jbe/bsw@0 1510 }
jbe@23 1511 // return nothing:
jbe/bsw@0 1512 return 0;
jbe/bsw@0 1513 }
jbe/bsw@0 1514
jbe@23 1515 // method "iterate_over_references" of classes (models):
jbe/bsw@0 1516 static int mondelefant_class_iterate_over_references(lua_State *L) {
jbe/bsw@0 1517 return luaL_error(L, "Reference iterator not implemented yet."); // TODO
jbe/bsw@0 1518 }
jbe/bsw@0 1519
jbe@23 1520 // method "get_foreign_key_reference_name" of classes (models):
jbe/bsw@0 1521 static int mondelefant_class_get_foreign_key_reference_name(lua_State *L) {
jbe/bsw@0 1522 lua_settop(L, 2);
jbe/bsw@0 1523 while (lua_toboolean(L, 1)) {
jbe@23 1524 // get "foreign_keys" table:
jbe/bsw@0 1525 lua_getfield(L, 1, "foreign_keys"); // 3
jbe@23 1526 // perform lookup:
jbe/bsw@0 1527 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1528 lua_gettable(L, 3); // 4
jbe@23 1529 // return result, if lookup was successful:
jbe/bsw@0 1530 if (!lua_isnil(L, 4)) return 1;
jbe@23 1531 // replace current table by its prototype:
jbe/bsw@0 1532 lua_settop(L, 2);
jbe/bsw@0 1533 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1534 lua_rawget(L, 1); // 3
jbe/bsw@0 1535 lua_replace(L, 1);
jbe/bsw@0 1536 }
jbe@23 1537 // return nothing:
jbe/bsw@0 1538 return 0;
jbe/bsw@0 1539 }
jbe/bsw@0 1540
jbe@23 1541 // meta-method "__index" of database result lists and objects:
jbe/bsw@0 1542 static int mondelefant_result_index(lua_State *L) {
jbe/bsw@0 1543 const char *result_type;
jbe@23 1544 // only lookup, when key is a string not beginning with an underscore:
jbe/bsw@0 1545 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe@23 1546 return 0;
jbe/bsw@0 1547 }
jbe@384 1548 // value of "_class" attribute or default class on stack position 3:
jbe@23 1549 lua_settop(L, 2);
jbe/bsw@0 1550 lua_getfield(L, 1, "_class"); // 3
jbe/bsw@0 1551 if (!lua_toboolean(L, 3)) {
jbe/bsw@0 1552 lua_settop(L, 2);
jbe/bsw@0 1553 lua_getfield(L,
jbe/bsw@0 1554 LUA_REGISTRYINDEX,
jbe/bsw@0 1555 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1556 ); // 3
jbe/bsw@0 1557 }
jbe@23 1558 // get value of "_type" attribute:
jbe/bsw@0 1559 lua_getfield(L, 1, "_type"); // 4
jbe/bsw@0 1560 result_type = lua_tostring(L, 4);
jbe@23 1561 // different lookup for lists and objects:
jbe@23 1562 if (result_type && !strcmp(result_type, "object")) { // object
jbe/bsw@0 1563 lua_settop(L, 3);
jbe@384 1564 // try inherited attributes, methods or getter functions:
jbe@383 1565 lua_pushvalue(L, 3); // 4
jbe@383 1566 while (lua_toboolean(L, 4)) {
jbe@383 1567 lua_getfield(L, 4, "object"); // 5
jbe@383 1568 lua_pushvalue(L, 2); // 6
jbe@383 1569 lua_gettable(L, 5); // 6
jbe@383 1570 if (!lua_isnil(L, 6)) return 1;
jbe@383 1571 lua_settop(L, 4);
jbe@383 1572 lua_getfield(L, 4, "object_get"); // 5
jbe@383 1573 lua_pushvalue(L, 2); // 6
jbe@383 1574 lua_gettable(L, 5); // 6
jbe@383 1575 if (lua_toboolean(L, 6)) {
jbe@383 1576 lua_pushvalue(L, 1); // 7
jbe@383 1577 lua_call(L, 1, 1); // 6
jbe/bsw@0 1578 return 1;
jbe/bsw@0 1579 }
jbe@383 1580 lua_settop(L, 4);
jbe@383 1581 lua_pushliteral(L, "prototype"); // 5
jbe@383 1582 lua_rawget(L, 4); // 5
jbe@383 1583 lua_replace(L, 4);
jbe/bsw@0 1584 }
jbe@383 1585 lua_settop(L, 3);
jbe/bsw@0 1586 // try primary keys of referenced objects:
jbe/bsw@0 1587 lua_pushcfunction(L,
jbe/bsw@0 1588 mondelefant_class_get_foreign_key_reference_name
jbe@383 1589 ); // 4
jbe@383 1590 lua_pushvalue(L, 3); // 5
jbe@383 1591 lua_pushvalue(L, 2); // 6
jbe@383 1592 lua_call(L, 2, 1); // 4
jbe@383 1593 if (!lua_isnil(L, 4)) {
jbe@383 1594 // reference name at stack position 4
jbe@383 1595 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@382 1596 lua_pushvalue(L, 3); // 6
jbe@383 1597 lua_pushvalue(L, 4); // 7
jbe@383 1598 lua_call(L, 2, 1); // reference info at stack position 5
jbe@383 1599 lua_getfield(L, 1, "_ref"); // 6
jbe@383 1600 lua_getfield(L, 5, "ref"); // 7
jbe@383 1601 lua_gettable(L, 6); // 7
jbe@383 1602 if (!lua_isnil(L, 7)) {
jbe@383 1603 if (lua_toboolean(L, 7)) {
jbe@383 1604 lua_getfield(L, 5, "that_key"); // 8
jbe@383 1605 if (lua_isnil(L, 8)) {
jbe/bsw@0 1606 return luaL_error(L, "Missing 'that_key' entry in model reference.");
jbe/bsw@0 1607 }
jbe@383 1608 lua_gettable(L, 7); // 8
jbe/bsw@0 1609 } else {
jbe/bsw@0 1610 lua_pushnil(L);
jbe/bsw@0 1611 }
jbe/bsw@0 1612 return 1;
jbe/bsw@0 1613 }
jbe/bsw@0 1614 }
jbe@383 1615 lua_settop(L, 3);
jbe@383 1616 lua_getfield(L, 1, "_data"); // _data table on stack position 4
jbe/bsw@0 1617 // try normal data field info:
jbe@383 1618 lua_pushvalue(L, 2); // 5
jbe@383 1619 lua_gettable(L, 4); // 5
jbe@383 1620 if (!lua_isnil(L, 5)) return 1;
jbe@383 1621 lua_settop(L, 4); // keep _data table on stack
jbe/bsw@0 1622 // try cached referenced object (or cached NULL reference):
jbe@383 1623 lua_getfield(L, 1, "_ref"); // 5
jbe@383 1624 lua_pushvalue(L, 2); // 6
jbe@383 1625 lua_gettable(L, 5); // 6
jbe@383 1626 if (lua_isboolean(L, 6) && !lua_toboolean(L, 6)) {
jbe/bsw@0 1627 lua_pushnil(L);
jbe/bsw@0 1628 return 1;
jbe@383 1629 } else if (!lua_isnil(L, 6)) {
jbe/bsw@0 1630 return 1;
jbe/bsw@0 1631 }
jbe@383 1632 lua_settop(L, 4);
jbe/bsw@0 1633 // try to load a referenced object:
jbe@383 1634 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@383 1635 lua_pushvalue(L, 3); // 6
jbe@383 1636 lua_pushvalue(L, 2); // 7
jbe@383 1637 lua_call(L, 2, 1); // 5
jbe@383 1638 if (!lua_isnil(L, 5)) {
jbe/bsw@0 1639 lua_settop(L, 2);
jbe/bsw@0 1640 lua_getfield(L, 1, "load"); // 3
jbe/bsw@0 1641 lua_pushvalue(L, 1); // 4 (self)
jbe/bsw@0 1642 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1643 lua_call(L, 2, 0);
jbe/bsw@0 1644 lua_settop(L, 2);
jbe/bsw@0 1645 lua_getfield(L, 1, "_ref"); // 3
jbe/bsw@0 1646 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1647 lua_gettable(L, 3); // 4
jbe/bsw@0 1648 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) lua_pushnil(L); // TODO: use special object instead of false
jbe/bsw@0 1649 return 1;
jbe/bsw@0 1650 }
jbe@383 1651 lua_settop(L, 4);
jbe@383 1652 // try proxy access to document in special column:
jbe@383 1653 lua_getfield(L, 3, "document_column"); // 5
jbe@383 1654 if (lua_toboolean(L, 5)) {
jbe@383 1655 lua_gettable(L, 4); // 5
jbe@383 1656 if (!lua_isnil(L, 5)) {
jbe@383 1657 lua_pushvalue(L, 2); // 6
jbe@383 1658 lua_gettable(L, 5); // 6
jbe@383 1659 if (!lua_isnil(L, 6)) return 1;
jbe@383 1660 }
jbe@383 1661 }
jbe/bsw@0 1662 return 0;
jbe@23 1663 } else if (result_type && !strcmp(result_type, "list")) { // list
jbe/bsw@0 1664 lua_settop(L, 3);
jbe/bsw@0 1665 // try inherited list attributes or methods:
jbe/bsw@0 1666 while (lua_toboolean(L, 3)) {
jbe/bsw@0 1667 lua_getfield(L, 3, "list"); // 4
jbe/bsw@0 1668 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1669 lua_gettable(L, 4); // 5
jbe/bsw@0 1670 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 1671 lua_settop(L, 3);
jbe/bsw@0 1672 lua_pushliteral(L, "prototype"); // 4
jbe/bsw@0 1673 lua_rawget(L, 3); // 4
jbe/bsw@0 1674 lua_replace(L, 3);
jbe/bsw@0 1675 }
jbe/bsw@0 1676 }
jbe@23 1677 // return nothing:
jbe/bsw@0 1678 return 0;
jbe/bsw@0 1679 }
jbe/bsw@0 1680
jbe@23 1681 // meta-method "__newindex" of database result lists and objects:
jbe/bsw@0 1682 static int mondelefant_result_newindex(lua_State *L) {
jbe/bsw@0 1683 const char *result_type;
jbe@23 1684 // perform rawset, unless key is a string not starting with underscore:
jbe/bsw@0 1685 lua_settop(L, 3);
jbe/bsw@0 1686 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe/bsw@0 1687 lua_rawset(L, 1);
jbe/bsw@0 1688 return 1;
jbe/bsw@0 1689 }
jbe@384 1690 // value of "_class" attribute or default class on stack position 4:
jbe@384 1691 lua_settop(L, 3);
jbe/bsw@0 1692 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0 1693 if (!lua_toboolean(L, 4)) {
jbe/bsw@0 1694 lua_settop(L, 3);
jbe/bsw@0 1695 lua_getfield(L,
jbe/bsw@0 1696 LUA_REGISTRYINDEX,
jbe/bsw@0 1697 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1698 ); // 4
jbe/bsw@0 1699 }
jbe@23 1700 // get value of "_type" attribute:
jbe/bsw@0 1701 lua_getfield(L, 1, "_type"); // 5
jbe/bsw@0 1702 result_type = lua_tostring(L, 5);
jbe@378 1703 // distinguish between lists and objects:
jbe@378 1704 if (result_type && !strcmp(result_type, "object")) { // objects
jbe@378 1705 lua_settop(L, 4);
jbe@378 1706 // try object setter functions:
jbe@384 1707 lua_pushvalue(L, 4); // 5
jbe@384 1708 while (lua_toboolean(L, 5)) {
jbe@384 1709 lua_getfield(L, 5, "object_set"); // 6
jbe@384 1710 lua_pushvalue(L, 2); // 7
jbe@384 1711 lua_gettable(L, 6); // 7
jbe@384 1712 if (lua_toboolean(L, 7)) {
jbe@384 1713 lua_pushvalue(L, 1); // 8
jbe@384 1714 lua_pushvalue(L, 3); // 9
jbe@378 1715 lua_call(L, 2, 0);
jbe@378 1716 return 0;
jbe@378 1717 }
jbe@384 1718 lua_settop(L, 5);
jbe@384 1719 lua_pushliteral(L, "prototype"); // 6
jbe@384 1720 lua_rawget(L, 5); // 6
jbe@384 1721 lua_replace(L, 5);
jbe@378 1722 }
jbe@384 1723 lua_settop(L, 4);
jbe@384 1724 lua_getfield(L, 1, "_data"); // _data table on stack position 5
jbe/bsw@0 1725 // check, if a object reference is changed:
jbe@384 1726 lua_pushcfunction(L, mondelefant_class_get_reference); // 6
jbe@384 1727 lua_pushvalue(L, 4); // 7
jbe@384 1728 lua_pushvalue(L, 2); // 8
jbe@384 1729 lua_call(L, 2, 1); // 6
jbe@384 1730 if (!lua_isnil(L, 6)) {
jbe/bsw@0 1731 // store object in _ref table (use false for nil): // TODO: use special object instead of false
jbe@384 1732 lua_getfield(L, 1, "_ref"); // 7
jbe@384 1733 lua_pushvalue(L, 2); // 8
jbe@384 1734 if (lua_isnil(L, 3)) lua_pushboolean(L, 0); // 9
jbe@384 1735 else lua_pushvalue(L, 3); // 9
jbe@384 1736 lua_settable(L, 7);
jbe@384 1737 lua_settop(L, 6);
jbe/bsw@0 1738 // delete referencing key from _data table:
jbe@384 1739 lua_getfield(L, 6, "this_key"); // 7
jbe@384 1740 if (lua_isnil(L, 7)) {
jbe/bsw@0 1741 return luaL_error(L, "Missing 'this_key' entry in model reference.");
jbe/bsw@0 1742 }
jbe@384 1743 lua_pushvalue(L, 7); // 8
jbe@384 1744 lua_pushnil(L); // 9
jbe@384 1745 lua_settable(L, 5);
jbe@384 1746 lua_getfield(L, 1, "_dirty"); // 8
jbe@384 1747 lua_pushvalue(L, 7); // 9
jbe@384 1748 lua_pushboolean(L, 1); // 10
jbe@384 1749 lua_settable(L, 8);
jbe@384 1750 return 0;
jbe@384 1751 }
jbe@384 1752 lua_settop(L, 5);
jbe@384 1753 // check proxy access to document in special column:
jbe@384 1754 lua_getfield(L, 4, "document_column"); // 6
jbe@384 1755 if (lua_toboolean(L, 6)) {
jbe@384 1756 lua_getfield(L, 1, "_column_info"); // 7
jbe@401 1757 if (!lua_isnil(L, 7)) { // TODO: quick fix to avoid problems on document creation
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@401 1771 } // TODO: quick fix to avoid problems on document creation
jbe@384 1772 }
jbe@384 1773 lua_settop(L, 5);
jbe@384 1774 // store value in data field info:
jbe@384 1775 lua_pushvalue(L, 2); // 6
jbe@384 1776 lua_pushvalue(L, 3); // 7
jbe@384 1777 lua_settable(L, 5);
jbe@384 1778 lua_settop(L, 4);
jbe@384 1779 // mark field as dirty (needs to be UPDATEd on save):
jbe@384 1780 lua_getfield(L, 1, "_dirty"); // 5
jbe@384 1781 lua_pushvalue(L, 2); // 6
jbe@384 1782 lua_pushboolean(L, 1); // 7
jbe@384 1783 lua_settable(L, 5);
jbe@384 1784 lua_settop(L, 4);
jbe@384 1785 // reset reference cache, if neccessary:
jbe@384 1786 lua_pushcfunction(L,
jbe@384 1787 mondelefant_class_get_foreign_key_reference_name
jbe@384 1788 ); // 5
jbe@384 1789 lua_pushvalue(L, 4); // 6
jbe@384 1790 lua_pushvalue(L, 2); // 7
jbe@384 1791 lua_call(L, 2, 1); // 5
jbe@384 1792 if (!lua_isnil(L, 5)) {
jbe@384 1793 lua_getfield(L, 1, "_ref"); // 6
jbe@382 1794 lua_pushvalue(L, 5); // 7
jbe@382 1795 lua_pushnil(L); // 8
jbe@382 1796 lua_settable(L, 6);
jbe/bsw@0 1797 }
jbe/bsw@0 1798 return 0;
jbe@23 1799 } else { // non-objects (i.e. lists)
jbe@23 1800 // perform rawset:
jbe/bsw@0 1801 lua_settop(L, 3);
jbe/bsw@0 1802 lua_rawset(L, 1);
jbe/bsw@0 1803 return 0;
jbe/bsw@0 1804 }
jbe/bsw@0 1805 }
jbe/bsw@0 1806
jbe@23 1807 // meta-method "__index" of classes (models):
jbe/bsw@0 1808 static int mondelefant_class_index(lua_State *L) {
jbe@23 1809 // perform lookup in prototype:
jbe/bsw@0 1810 lua_settop(L, 2);
jbe/bsw@0 1811 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1812 lua_rawget(L, 1); // 3
jbe/bsw@0 1813 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1814 lua_gettable(L, 3); // 4
jbe/bsw@0 1815 return 1;
jbe/bsw@0 1816 }
jbe/bsw@0 1817
jbe@23 1818 // registration information for functions of library:
jbe/bsw@0 1819 static const struct luaL_Reg mondelefant_module_functions[] = {
jbe/bsw@0 1820 {"connect", mondelefant_connect},
jbe/bsw@0 1821 {"set_class", mondelefant_set_class},
jbe/bsw@0 1822 {"new_class", mondelefant_new_class},
jbe/bsw@0 1823 {NULL, NULL}
jbe/bsw@0 1824 };
jbe/bsw@0 1825
jbe@23 1826 // registration information for meta-methods of database connections:
jbe/bsw@0 1827 static const struct luaL_Reg mondelefant_conn_mt_functions[] = {
jbe/bsw@0 1828 {"__gc", mondelefant_conn_free},
jbe/bsw@0 1829 {"__index", mondelefant_conn_index},
jbe/bsw@0 1830 {"__newindex", mondelefant_conn_newindex},
jbe/bsw@0 1831 {NULL, NULL}
jbe/bsw@0 1832 };
jbe/bsw@0 1833
jbe@23 1834 // registration information for methods of database connections:
jbe/bsw@0 1835 static const struct luaL_Reg mondelefant_conn_methods[] = {
jbe/bsw@0 1836 {"close", mondelefant_conn_close},
jbe/bsw@0 1837 {"is_ok", mondelefant_conn_is_ok},
jbe/bsw@0 1838 {"get_transaction_status", mondelefant_conn_get_transaction_status},
jbe@397 1839 {"try_wait", mondelefant_conn_try_wait},
jbe@393 1840 {"wait", mondelefant_conn_wait},
jbe/bsw@0 1841 {"create_list", mondelefant_conn_create_list},
jbe/bsw@0 1842 {"create_object", mondelefant_conn_create_object},
jbe/bsw@0 1843 {"quote_string", mondelefant_conn_quote_string},
jbe/bsw@0 1844 {"quote_binary", mondelefant_conn_quote_binary},
jbe/bsw@0 1845 {"assemble_command", mondelefant_conn_assemble_command},
jbe/bsw@0 1846 {"try_query", mondelefant_conn_try_query},
jbe/bsw@0 1847 {"query", mondelefant_conn_query},
jbe/bsw@0 1848 {NULL, NULL}
jbe/bsw@0 1849 };
jbe/bsw@0 1850
jbe@23 1851 // registration information for meta-methods of error objects:
jbe/bsw@0 1852 static const struct luaL_Reg mondelefant_errorobject_mt_functions[] = {
jbe/bsw@0 1853 {NULL, NULL}
jbe/bsw@0 1854 };
jbe/bsw@0 1855
jbe@23 1856 // registration information for methods of error objects:
jbe/bsw@0 1857 static const struct luaL_Reg mondelefant_errorobject_methods[] = {
jbe@397 1858 {"escalate", lua_error},
jbe/bsw@0 1859 {"is_kind_of", mondelefant_errorobject_is_kind_of},
jbe/bsw@0 1860 {NULL, NULL}
jbe/bsw@0 1861 };
jbe/bsw@0 1862
jbe@23 1863 // registration information for meta-methods of database result lists/objects:
jbe/bsw@0 1864 static const struct luaL_Reg mondelefant_result_mt_functions[] = {
jbe/bsw@0 1865 {"__index", mondelefant_result_index},
jbe/bsw@0 1866 {"__newindex", mondelefant_result_newindex},
jbe/bsw@0 1867 {NULL, NULL}
jbe/bsw@0 1868 };
jbe/bsw@0 1869
jbe@23 1870 // registration information for methods of database result lists/objects:
jbe/bsw@0 1871 static const struct luaL_Reg mondelefant_class_mt_functions[] = {
jbe/bsw@0 1872 {"__index", mondelefant_class_index},
jbe/bsw@0 1873 {NULL, NULL}
jbe/bsw@0 1874 };
jbe/bsw@0 1875
jbe@23 1876 // registration information for methods of classes (models):
jbe/bsw@0 1877 static const struct luaL_Reg mondelefant_class_methods[] = {
jbe/bsw@0 1878 {"get_reference", mondelefant_class_get_reference},
jbe/bsw@0 1879 {"iterate_over_references", mondelefant_class_iterate_over_references},
jbe/bsw@0 1880 {"get_foreign_key_reference_name",
jbe/bsw@0 1881 mondelefant_class_get_foreign_key_reference_name},
jbe/bsw@0 1882 {NULL, NULL}
jbe/bsw@0 1883 };
jbe/bsw@0 1884
jbe@23 1885 // registration information for methods of database result objects (not lists!):
jbe/bsw@0 1886 static const struct luaL_Reg mondelefant_object_methods[] = {
jbe/bsw@0 1887 {NULL, NULL}
jbe/bsw@0 1888 };
jbe/bsw@0 1889
jbe@23 1890 // registration information for methods of database result lists (not single objects!):
jbe/bsw@0 1891 static const struct luaL_Reg mondelefant_list_methods[] = {
jbe/bsw@0 1892 {NULL, NULL}
jbe/bsw@0 1893 };
jbe/bsw@0 1894
jbe@23 1895 // luaopen function to initialize/register library:
jbe/bsw@0 1896 int luaopen_mondelefant_native(lua_State *L) {
jbe/bsw@0 1897 lua_settop(L, 0);
jbe/bsw@0 1898 lua_newtable(L); // module at stack position 1
jbe@64 1899 luaL_setfuncs(L, mondelefant_module_functions, 0);
jbe/bsw@0 1900
jbe/bsw@0 1901 lua_pushvalue(L, 1); // 2
jbe/bsw@0 1902 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe/bsw@0 1903
jbe/bsw@0 1904 lua_newtable(L); // 2
jbe/bsw@0 1905 // NOTE: only PostgreSQL is supported yet:
jbe@64 1906 luaL_setfuncs(L, mondelefant_conn_methods, 0);
jbe/bsw@0 1907 lua_setfield(L, 1, "postgresql_connection_prototype");
jbe/bsw@0 1908 lua_newtable(L); // 2
jbe/bsw@0 1909 lua_setfield(L, 1, "connection_prototype");
jbe/bsw@0 1910
jbe/bsw@0 1911 luaL_newmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe@64 1912 luaL_setfuncs(L, mondelefant_conn_mt_functions, 0);
jbe/bsw@0 1913 lua_settop(L, 1);
jbe/bsw@0 1914 luaL_newmetatable(L, MONDELEFANT_RESULT_MT_REGKEY); // 2
jbe@64 1915 luaL_setfuncs(L, mondelefant_result_mt_functions, 0);
jbe/bsw@0 1916 lua_setfield(L, 1, "result_metatable");
jbe/bsw@0 1917 luaL_newmetatable(L, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe@64 1918 luaL_setfuncs(L, mondelefant_class_mt_functions, 0);
jbe/bsw@0 1919 lua_setfield(L, 1, "class_metatable");
jbe/bsw@0 1920
jbe/bsw@0 1921 lua_newtable(L); // 2
jbe@272 1922 luaL_setfuncs(L, mondelefant_class_methods, 0);
jbe/bsw@0 1923 lua_newtable(L); // 3
jbe@64 1924 luaL_setfuncs(L, mondelefant_object_methods, 0);
jbe/bsw@0 1925 lua_setfield(L, 2, "object");
jbe/bsw@0 1926 lua_newtable(L); // 3
jbe/bsw@0 1927 lua_setfield(L, 2, "object_get");
jbe/bsw@0 1928 lua_newtable(L); // 3
jbe/bsw@0 1929 lua_setfield(L, 2, "object_set");
jbe/bsw@0 1930 lua_newtable(L); // 3
jbe@64 1931 luaL_setfuncs(L, mondelefant_list_methods, 0);
jbe/bsw@0 1932 lua_setfield(L, 2, "list");
jbe/bsw@0 1933 lua_newtable(L); // 3
jbe/bsw@0 1934 lua_setfield(L, 2, "references");
jbe/bsw@0 1935 lua_newtable(L); // 3
jbe/bsw@0 1936 lua_setfield(L, 2, "foreign_keys");
jbe/bsw@0 1937 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1938 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY);
jbe/bsw@0 1939 lua_setfield(L, 1, "class_prototype");
jbe/bsw@0 1940
jbe/bsw@0 1941 luaL_newmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY); // 2
jbe@64 1942 luaL_setfuncs(L, mondelefant_errorobject_mt_functions, 0);
jbe/bsw@0 1943 lua_newtable(L); // 3
jbe@64 1944 luaL_setfuncs(L, mondelefant_errorobject_methods, 0);
jbe/bsw@0 1945 lua_setfield(L, 2, "__index");
jbe/bsw@0 1946 lua_setfield(L, 1, "errorobject_metatable");
jbe/bsw@0 1947
jbe/bsw@0 1948 return 1;
jbe/bsw@0 1949 }

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