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annotate libraries/mondelefant/mondelefant_native.c @ 406:36f0d1d5ed7d

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Further fixes in mondelefant.connect{...} (including proper handling of garbage collection in case of memory allocation errors); Code cleanup (use luaL_setmetatable, which is available since Lua 5.2)
author jbe
date Wed Jan 06 18:59:58 2016 +0100 (2016-01-06)
parents 04172238d79b
children 0e641ac76647
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/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 const char *conninfo; // string for PQconnectdb function
jbe@23 198 mondelefant_conn_t *conn; // C-structure for userdata
jbe@402 199 // check if string is given as first argument:
jbe@402 200 if (lua_type(L, 1) != LUA_TSTRING) {
jbe@402 201 // expect a table as first argument if no string is given:
jbe@402 202 luaL_checktype(L, 1, LUA_TTABLE);
jbe@406 203 // extract conninfo string for PQconnectdb if possible:
jbe@406 204 lua_getfield(L, 1, "conninfo");
jbe@406 205 if (!lua_isnil(L, -1)) {
jbe@402 206 // if yes, use that value but check its type:
jbe@406 207 luaL_argcheck(L, lua_type(L, -1) == LUA_TSTRING, 1, "\"conninfo\" value is not a string");
jbe@402 208 } else {
jbe@402 209 // otherwise assemble conninfo string from the named options:
jbe@402 210 luaL_Buffer buf;
jbe@40 211 int need_seperator = 0;
jbe@402 212 const char *value;
jbe@402 213 size_t value_len;
jbe@402 214 size_t value_pos = 0;
jbe@402 215 lua_settop(L, 1);
jbe@402 216 lua_pushnil(L); // slot for key at stack position 2
jbe@402 217 lua_pushnil(L); // slot for value at stack position 3
jbe@402 218 luaL_buffinit(L, &buf);
jbe@40 219 while (lua_pushvalue(L, 2), lua_next(L, 1)) {
jbe@402 220 luaL_argcheck(L, lua_isstring(L, -2), 1, "key in table is not a string");
jbe@402 221 luaL_argcheck(L, lua_isstring(L, -1), 1, "value in table is not a string");
jbe@402 222 value = lua_tolstring(L, -1, &value_len);
jbe@40 223 lua_replace(L, 3);
jbe@402 224 lua_pop(L, 1);
jbe@40 225 lua_replace(L, 2);
jbe@402 226 if (need_seperator) luaL_addchar(&buf, ' ');
jbe@40 227 // NOTE: numbers will be converted to strings automatically here,
jbe@40 228 // but perhaps this will change in future versions of lua
jbe@40 229 lua_pushvalue(L, 2);
jbe@402 230 luaL_addvalue(&buf);
jbe@402 231 luaL_addchar(&buf, '=');
jbe@402 232 luaL_addchar(&buf, '\'');
jbe@402 233 do {
jbe@402 234 char c;
jbe@402 235 c = value[value_pos++];
jbe@402 236 if (c == '\'') luaL_addchar(&buf, '\\');
jbe@402 237 luaL_addchar(&buf, c);
jbe@402 238 } while (value_pos < value_len);
jbe@402 239 luaL_addchar(&buf, '\'');
jbe@402 240 need_seperator = 1;
jbe/bsw@0 241 }
jbe@402 242 luaL_pushresult(&buf);
jbe/bsw@0 243 }
jbe@402 244 // ensure that string is on stack position 1 which is the top of stack:
jbe@402 245 lua_replace(L, 1);
jbe/bsw@0 246 }
jbe@402 247 // use conninfo string on stack position 1:
jbe@402 248 conninfo = lua_tostring(L, 1);
jbe@406 249 // create userdata on stack position 2:
jbe@406 250 lua_settop(L, 1);
jbe@406 251 conn = lua_newuserdata(L, sizeof(*conn)); // 2
jbe@23 252 // call PQconnectdb function of libpq:
jbe@406 253 conn->pgconn = PQconnectdb(conninfo);
jbe@406 254 // try emergency garbage collection on first failure:
jbe@406 255 if (!conn->pgconn) {
jbe@406 256 lua_gc(L, LUA_GCCOLLECT, 0);
jbe@406 257 conn->pgconn = PQconnectdb(conninfo);
jbe/bsw@0 258 }
jbe@406 259 // throw error in case of (unexpected) error of PQconnectdb call:
jbe@406 260 if (!conn->pgconn) return luaL_error(L,
jbe@406 261 "Error in libpq while creating 'PGconn' structure."
jbe@406 262 );
jbe@406 263 // set metatable for userdata (ensure PQfinish on unexpected error below):
jbe@406 264 luaL_setmetatable(L, MONDELEFANT_CONN_MT_REGKEY);
jbe@406 265 // check result of PQconnectdb call:
jbe@406 266 if (PQstatus(conn->pgconn) != CONNECTION_OK) {
jbe@406 267 lua_pushnil(L); // 3
jbe@406 268 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 4
jbe@406 269 lua_newtable(L); // 5
jbe@406 270 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe/bsw@0 271 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@406 272 lua_setfield(L, 5, "code");
jbe@406 273 lua_pushvalue(L, 4);
jbe@406 274 lua_setfield(L, 5, "message");
jbe@406 275 // manual PQfinish (do not wait until garbage collection):
jbe@406 276 PQfinish(conn->pgconn);
jbe@406 277 conn->pgconn = NULL;
jbe/bsw@0 278 return 3;
jbe/bsw@0 279 }
jbe@23 280 // set 'server_encoding' in C-struct of userdata:
jbe/bsw@0 281 {
jbe/bsw@0 282 const char *charset;
jbe@406 283 charset = PQparameterStatus(conn->pgconn, "server_encoding");
jbe/bsw@0 284 if (charset && !strcmp(charset, "UTF8")) {
jbe/bsw@0 285 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_UTF8;
jbe/bsw@0 286 } else {
jbe/bsw@0 287 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_ASCII;
jbe/bsw@0 288 }
jbe/bsw@0 289 }
jbe@396 290 // create and associate userdata table:
jbe@396 291 lua_newtable(L);
jbe@406 292 lua_setuservalue(L, 2);
jbe@396 293 // store key "fd" with file descriptor of connection:
jbe@406 294 lua_pushinteger(L, PQsocket(conn->pgconn));
jbe@406 295 lua_setfield(L, 2, "fd");
jbe@23 296 // store key "engine" with value "postgresql" as connection specific data:
jbe/bsw@0 297 lua_pushliteral(L, "postgresql");
jbe@406 298 lua_setfield(L, 2, "engine");
jbe@23 299 // return userdata:
jbe/bsw@0 300 return 1;
jbe/bsw@0 301 }
jbe/bsw@0 302
jbe@23 303 // returns pointer to libpq handle 'pgconn' of userdata at given index
jbe@23 304 // (or throws error, if database connection has been closed):
jbe/bsw@0 305 static mondelefant_conn_t *mondelefant_get_conn(lua_State *L, int index) {
jbe/bsw@0 306 mondelefant_conn_t *conn;
jbe/bsw@0 307 conn = luaL_checkudata(L, index, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 308 if (!conn->pgconn) {
jbe/bsw@0 309 luaL_error(L, "PostgreSQL connection has been closed.");
jbe/bsw@0 310 return NULL;
jbe/bsw@0 311 }
jbe/bsw@0 312 return conn;
jbe/bsw@0 313 }
jbe/bsw@0 314
jbe@23 315 // meta-method "__index" of database handles (userdata):
jbe/bsw@0 316 static int mondelefant_conn_index(lua_State *L) {
jbe@23 317 // try table for connection specific data:
jbe/bsw@0 318 lua_settop(L, 2);
jbe@396 319 lua_getuservalue(L, 1); // 3
jbe/bsw@0 320 lua_pushvalue(L, 2); // 4
jbe/bsw@0 321 lua_gettable(L, 3); // 4
jbe/bsw@0 322 if (!lua_isnil(L, 4)) return 1;
jbe@23 323 // try to use prototype stored in connection specific data:
jbe/bsw@0 324 lua_settop(L, 3);
jbe/bsw@0 325 lua_getfield(L, 3, "prototype"); // 4
jbe/bsw@0 326 if (lua_toboolean(L, 4)) {
jbe/bsw@0 327 lua_pushvalue(L, 2); // 5
jbe/bsw@0 328 lua_gettable(L, 4); // 5
jbe/bsw@0 329 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 330 }
jbe@23 331 // try to use "postgresql_connection_prototype" of library:
jbe/bsw@0 332 lua_settop(L, 2);
jbe/bsw@0 333 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY); // 3
jbe/bsw@0 334 lua_getfield(L, 3, "postgresql_connection_prototype"); // 4
jbe/bsw@0 335 if (lua_toboolean(L, 4)) {
jbe/bsw@0 336 lua_pushvalue(L, 2); // 5
jbe/bsw@0 337 lua_gettable(L, 4); // 5
jbe/bsw@0 338 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 339 }
jbe@23 340 // try to use "connection_prototype" of library:
jbe/bsw@0 341 lua_settop(L, 3);
jbe/bsw@0 342 lua_getfield(L, 3, "connection_prototype"); // 4
jbe/bsw@0 343 if (lua_toboolean(L, 4)) {
jbe/bsw@0 344 lua_pushvalue(L, 2); // 5
jbe/bsw@0 345 lua_gettable(L, 4); // 5
jbe/bsw@0 346 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 347 }
jbe@23 348 // give up and return nothing:
jbe/bsw@0 349 return 0;
jbe/bsw@0 350 }
jbe/bsw@0 351
jbe@23 352 // meta-method "__newindex" of database handles (userdata):
jbe/bsw@0 353 static int mondelefant_conn_newindex(lua_State *L) {
jbe@23 354 // store key-value pair in table for connection specific data:
jbe/bsw@0 355 lua_settop(L, 3);
jbe@396 356 lua_getuservalue(L, 1); // 4
jbe/bsw@0 357 lua_pushvalue(L, 2);
jbe/bsw@0 358 lua_pushvalue(L, 3);
jbe/bsw@0 359 lua_settable(L, 4);
jbe@23 360 // return nothing:
jbe/bsw@0 361 return 0;
jbe/bsw@0 362 }
jbe/bsw@0 363
jbe@23 364 // meta-method "__gc" of database handles:
jbe/bsw@0 365 static int mondelefant_conn_free(lua_State *L) {
jbe/bsw@0 366 mondelefant_conn_t *conn;
jbe/bsw@0 367 conn = luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 368 if (conn->pgconn) PQfinish(conn->pgconn);
jbe/bsw@0 369 conn->pgconn = NULL;
jbe/bsw@0 370 return 0;
jbe/bsw@0 371 }
jbe/bsw@0 372
jbe@23 373 // method "close" of database handles:
jbe/bsw@0 374 static int mondelefant_conn_close(lua_State *L) {
jbe/bsw@0 375 mondelefant_conn_t *conn;
jbe/bsw@0 376 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 377 PQfinish(conn->pgconn);
jbe/bsw@0 378 conn->pgconn = NULL;
jbe@397 379 lua_pushnil(L);
jbe@396 380 lua_setfield(L, 1, "fd"); // set "fd" attribute to nil
jbe/bsw@0 381 return 0;
jbe/bsw@0 382 }
jbe/bsw@0 383
jbe@23 384 // method "is_okay" of database handles:
jbe/bsw@0 385 static int mondelefant_conn_is_ok(lua_State *L) {
jbe/bsw@0 386 mondelefant_conn_t *conn;
jbe/bsw@0 387 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 388 lua_pushboolean(L, PQstatus(conn->pgconn) == CONNECTION_OK);
jbe/bsw@0 389 return 1;
jbe/bsw@0 390 }
jbe/bsw@0 391
jbe@23 392 // method "get_transaction_status" of database handles:
jbe/bsw@0 393 static int mondelefant_conn_get_transaction_status(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 switch (PQtransactionStatus(conn->pgconn)) {
jbe/bsw@0 397 case PQTRANS_IDLE:
jbe/bsw@0 398 lua_pushliteral(L, "idle");
jbe/bsw@0 399 break;
jbe/bsw@0 400 case PQTRANS_ACTIVE:
jbe/bsw@0 401 lua_pushliteral(L, "active");
jbe/bsw@0 402 break;
jbe/bsw@0 403 case PQTRANS_INTRANS:
jbe/bsw@0 404 lua_pushliteral(L, "intrans");
jbe/bsw@0 405 break;
jbe/bsw@0 406 case PQTRANS_INERROR:
jbe/bsw@0 407 lua_pushliteral(L, "inerror");
jbe/bsw@0 408 break;
jbe/bsw@0 409 default:
jbe/bsw@0 410 lua_pushliteral(L, "unknown");
jbe/bsw@0 411 }
jbe/bsw@0 412 return 1;
jbe/bsw@0 413 }
jbe/bsw@0 414
jbe@397 415 // method "try_wait" of database handles:
jbe@397 416 static int mondelefant_conn_try_wait(lua_State *L) {
jbe@393 417 mondelefant_conn_t *conn;
jbe@393 418 int infinite, nonblock = 0;
jbe@393 419 struct timespec wakeup;
jbe@393 420 int fd;
jbe@393 421 fd_set fds;
jbe@393 422 conn = mondelefant_get_conn(L, 1);
jbe@393 423 infinite = lua_isnoneornil(L, 2);
jbe@393 424 if (!infinite) {
jbe@393 425 lua_Number n;
jbe@393 426 int isnum;
jbe@393 427 n = lua_tonumberx(L, 2, &isnum);
jbe@393 428 if (isnum && n>0 && n<=86400*366) {
jbe@393 429 if (clock_gettime(CLOCK_MONOTONIC, &wakeup)) {
jbe@393 430 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 431 }
jbe@393 432 wakeup.tv_sec += n;
jbe@393 433 wakeup.tv_nsec += 1000000000 * (n - (time_t)n);
jbe@393 434 if (wakeup.tv_nsec >= 1000000000) {
jbe@393 435 wakeup.tv_sec += 1;
jbe@393 436 wakeup.tv_nsec -= 1000000000;
jbe@393 437 }
jbe@393 438 } else if (isnum && n==0) {
jbe@393 439 nonblock = 1;
jbe@393 440 } else {
jbe@393 441 luaL_argcheck(L, 0, 2, "not a valid timeout");
jbe@393 442 }
jbe@393 443 }
jbe@397 444 lua_settop(L, 1);
jbe@393 445 if (!nonblock) {
jbe@393 446 fd = PQsocket(conn->pgconn);
jbe@393 447 FD_ZERO(&fds);
jbe@393 448 FD_SET(fd, &fds);
jbe@393 449 }
jbe@393 450 while (true) {
jbe@393 451 {
jbe@393 452 PGnotify *notify;
jbe@393 453 if (!PQconsumeInput(conn->pgconn)) {
jbe@397 454 lua_newtable(L); // 2
jbe@406 455 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe@397 456 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@397 457 lua_setfield(L, 2, "code");
jbe@397 458 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 3
jbe@397 459 lua_setfield(L, 2, "message");
jbe@397 460 return 1;
jbe@393 461 }
jbe@393 462 notify = PQnotifies(conn->pgconn);
jbe@393 463 if (notify) {
jbe@397 464 lua_pushnil(L);
jbe@393 465 lua_pushstring(L, notify->relname);
jbe@393 466 lua_pushstring(L, notify->extra);
jbe@393 467 lua_pushinteger(L, notify->be_pid);
jbe@393 468 PQfreemem(notify);
jbe@397 469 return 4;
jbe@393 470 }
jbe@393 471 }
jbe@393 472 if (infinite) {
jbe@393 473 select(fd+1, &fds, NULL, NULL, NULL);
jbe@393 474 } else if (nonblock) {
jbe@393 475 break;
jbe@393 476 } else {
jbe@393 477 struct timespec tp;
jbe@393 478 struct timeval timeout = { 0, };
jbe@393 479 if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
jbe@393 480 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 481 }
jbe@393 482 tp.tv_sec = wakeup.tv_sec - tp.tv_sec;
jbe@393 483 tp.tv_nsec = wakeup.tv_nsec - tp.tv_nsec;
jbe@393 484 if (tp.tv_nsec < 0) {
jbe@393 485 tp.tv_sec -= 1;
jbe@393 486 tp.tv_nsec += 1000000000;
jbe@393 487 }
jbe@393 488 timeout.tv_sec = tp.tv_sec;
jbe@393 489 timeout.tv_usec = (tp.tv_nsec + 500) / 1000;
jbe@393 490 if (
jbe@393 491 timeout.tv_sec < 0 ||
jbe@393 492 (timeout.tv_sec == 0 && timeout.tv_usec == 0)
jbe@393 493 ) break;
jbe@393 494 select(fd+1, &fds, NULL, NULL, &timeout);
jbe@393 495 }
jbe@393 496 }
jbe@397 497 lua_pushnil(L);
jbe@397 498 lua_pushnil(L);
jbe@393 499 return 2;
jbe@393 500 }
jbe@393 501
jbe@23 502 // method "create_list" of database handles:
jbe/bsw@0 503 static int mondelefant_conn_create_list(lua_State *L) {
jbe@23 504 // ensure that first argument is a database connection:
jbe/bsw@0 505 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 506 // if no second argument is given, use an empty table:
jbe@397 507 if (lua_isnoneornil(L, 2)) {
jbe@397 508 lua_settop(L, 1);
jbe@397 509 lua_newtable(L); // 2
jbe@397 510 } else {
jbe@397 511 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 512 lua_settop(L, 2);
jbe/bsw@0 513 }
jbe@23 514 // set meta-table for database result lists/objects:
jbe@406 515 luaL_setmetatable(L, MONDELEFANT_RESULT_MT_REGKEY);
jbe@23 516 // set "_connection" attribute to self:
jbe/bsw@0 517 lua_pushvalue(L, 1); // 3
jbe/bsw@0 518 lua_setfield(L, 2, "_connection");
jbe@23 519 // set "_type" attribute to string "list":
jbe/bsw@0 520 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 521 lua_setfield(L, 2, "_type");
jbe@23 522 // return created database result list:
jbe/bsw@0 523 return 1;
jbe/bsw@0 524 }
jbe/bsw@0 525
jbe@23 526 // method "create_object" of database handles:
jbe/bsw@0 527 static int mondelefant_conn_create_object(lua_State *L) {
jbe@23 528 // ensure that first argument is a database connection:
jbe/bsw@0 529 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 530 // if no second argument is given, use an empty table:
jbe@397 531 if (lua_isnoneornil(L, 2)) {
jbe@397 532 lua_settop(L, 1);
jbe@397 533 lua_newtable(L); // 2
jbe@397 534 } else {
jbe@397 535 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 536 lua_settop(L, 2);
jbe/bsw@0 537 }
jbe@397 538 // set meta-table for database result lists/objects:
jbe@406 539 luaL_setmetatable(L, MONDELEFANT_RESULT_MT_REGKEY);
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 "object":
jbe/bsw@0 544 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 545 lua_setfield(L, 2, "_type"); // "object" or "list"
jbe@23 546 // create empty tables for "_data", "_dirty" and "_ref" attributes:
jbe/bsw@0 547 lua_newtable(L); // 3
jbe/bsw@0 548 lua_setfield(L, 2, "_data");
jbe/bsw@0 549 lua_newtable(L); // 3
jbe/bsw@0 550 lua_setfield(L, 2, "_dirty");
jbe/bsw@0 551 lua_newtable(L); // 3
jbe/bsw@0 552 lua_setfield(L, 2, "_ref"); // nil=no info, false=nil, else table
jbe@23 553 // return created database result object:
jbe/bsw@0 554 return 1;
jbe/bsw@0 555 }
jbe/bsw@0 556
jbe@23 557 // method "quote_string" of database handles:
jbe/bsw@0 558 static int mondelefant_conn_quote_string(lua_State *L) {
jbe/bsw@0 559 mondelefant_conn_t *conn;
jbe/bsw@0 560 const char *input;
jbe/bsw@0 561 size_t input_len;
jbe/bsw@0 562 char *output;
jbe/bsw@0 563 size_t output_len;
jbe@23 564 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 565 conn = mondelefant_get_conn(L, 1);
jbe@23 566 // get second argument, which must be a string:
jbe/bsw@0 567 input = luaL_checklstring(L, 2, &input_len);
jbe@23 568 // throw error, if string is too long:
jbe/bsw@0 569 if (input_len > (SIZE_MAX / sizeof(char) - 3) / 2) {
jbe/bsw@0 570 return luaL_error(L, "String to be escaped is too long.");
jbe/bsw@0 571 }
jbe@23 572 // allocate memory for quoted string:
jbe/bsw@0 573 output = malloc((2 * input_len + 3) * sizeof(char));
jbe/bsw@0 574 if (!output) {
jbe/bsw@0 575 return luaL_error(L, "Could not allocate memory for string quoting.");
jbe/bsw@0 576 }
jbe@23 577 // do escaping by calling PQescapeStringConn and enclosing result with
jbe@23 578 // single quotes:
jbe/bsw@0 579 output[0] = '\'';
jbe/bsw@0 580 output_len = PQescapeStringConn(
jbe/bsw@0 581 conn->pgconn, output + 1, input, input_len, NULL
jbe/bsw@0 582 );
jbe/bsw@0 583 output[output_len + 1] = '\'';
jbe/bsw@0 584 output[output_len + 2] = 0;
jbe@23 585 // create Lua string:
jbe/bsw@0 586 lua_pushlstring(L, output, output_len + 2);
jbe@23 587 // free allocated memory:
jbe/bsw@0 588 free(output);
jbe@23 589 // return Lua string:
jbe/bsw@0 590 return 1;
jbe/bsw@0 591 }
jbe/bsw@0 592
jbe@23 593 // method "quote_binary" of database handles:
jbe/bsw@0 594 static int mondelefant_conn_quote_binary(lua_State *L) {
jbe/bsw@0 595 mondelefant_conn_t *conn;
jbe/bsw@0 596 const char *input;
jbe/bsw@0 597 size_t input_len;
jbe/bsw@0 598 char *output;
jbe/bsw@0 599 size_t output_len;
jbe/bsw@0 600 luaL_Buffer buf;
jbe@23 601 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 602 conn = mondelefant_get_conn(L, 1);
jbe@23 603 // get second argument, which must be a string:
jbe/bsw@0 604 input = luaL_checklstring(L, 2, &input_len);
jbe@23 605 // call PQescapeByteaConn, which allocates memory itself:
jbe/bsw@0 606 output = (char *)PQescapeByteaConn(
jbe/bsw@0 607 conn->pgconn, (const unsigned char *)input, input_len, &output_len
jbe/bsw@0 608 );
jbe@23 609 // if PQescapeByteaConn returned NULL, then throw error:
jbe/bsw@0 610 if (!output) {
jbe/bsw@0 611 return luaL_error(L, "Could not allocate memory for binary quoting.");
jbe/bsw@0 612 }
jbe@23 613 // create Lua string enclosed by single quotes:
jbe/bsw@0 614 luaL_buffinit(L, &buf);
jbe/bsw@0 615 luaL_addchar(&buf, '\'');
jbe/bsw@0 616 luaL_addlstring(&buf, output, output_len - 1);
jbe/bsw@0 617 luaL_addchar(&buf, '\'');
jbe/bsw@0 618 luaL_pushresult(&buf);
jbe@23 619 // free memory allocated by PQescapeByteaConn:
jbe/bsw@0 620 PQfreemem(output);
jbe@23 621 // return Lua string:
jbe/bsw@0 622 return 1;
jbe/bsw@0 623 }
jbe/bsw@0 624
jbe@23 625 // method "assemble_command" of database handles:
jbe/bsw@0 626 static int mondelefant_conn_assemble_command(lua_State *L) {
jbe/bsw@0 627 mondelefant_conn_t *conn;
jbe/bsw@0 628 int paramidx = 2;
jbe/bsw@0 629 const char *template;
jbe/bsw@0 630 size_t template_pos = 0;
jbe/bsw@0 631 luaL_Buffer buf;
jbe@23 632 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 633 conn = mondelefant_get_conn(L, 1);
jbe@23 634 // if second argument is a string, return this string:
jbe@397 635 if (lua_type(L, 2) == LUA_TSTRING) {
jbe@397 636 lua_settop(L, 2);
jbe/bsw@0 637 return 1;
jbe/bsw@0 638 }
jbe@23 639 // if second argument has __tostring meta-method,
jbe@23 640 // then use this method and return its result:
jbe/bsw@0 641 if (luaL_callmeta(L, 2, "__tostring")) return 1;
jbe@23 642 // otherwise, require that second argument is a table:
jbe/bsw@0 643 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 644 // set stack top:
jbe@397 645 lua_settop(L, 2);
jbe@23 646 // get first element of table, which must be a string:
jbe/bsw@0 647 lua_rawgeti(L, 2, 1); // 3
jbe/bsw@0 648 luaL_argcheck(L,
jbe/bsw@0 649 lua_isstring(L, 3),
jbe/bsw@0 650 2,
jbe/bsw@0 651 "First entry of SQL command structure is not a string."
jbe/bsw@0 652 );
jbe/bsw@0 653 template = lua_tostring(L, 3);
jbe@23 654 // get value of "input_converter" attribute of database connection:
jbe/bsw@0 655 lua_pushliteral(L, "input_converter"); // 4
jbe/bsw@0 656 lua_gettable(L, 1); // input_converter at stack position 4
jbe@23 657 // reserve space on Lua stack:
jbe/bsw@0 658 lua_pushnil(L); // free space at stack position 5
jbe/bsw@0 659 lua_pushnil(L); // free space at stack position 6
jbe@23 660 // initialize Lua buffer for result string:
jbe/bsw@0 661 luaL_buffinit(L, &buf);
jbe@23 662 // fill buffer in loop:
jbe/bsw@0 663 while (1) {
jbe@23 664 // variable declaration:
jbe/bsw@0 665 char c;
jbe@23 666 // get next character:
jbe/bsw@0 667 c = template[template_pos++];
jbe@23 668 // break, when character is NULL byte:
jbe/bsw@0 669 if (!c) break;
jbe@23 670 // question-mark and dollar-sign are special characters:
jbe@23 671 if (c == '?' || c == '$') { // special character found
jbe@23 672 // check, if same character follows:
jbe@23 673 if (template[template_pos] == c) { // special character is escaped
jbe@23 674 // consume two characters of input and add one character to buffer:
jbe/bsw@0 675 template_pos++;
jbe/bsw@0 676 luaL_addchar(&buf, c);
jbe@23 677 } else { // special character is not escaped
jbe/bsw@0 678 luaL_Buffer keybuf;
jbe/bsw@0 679 int subcmd;
jbe@23 680 // set 'subcmd' = true, if special character was a dollar-sign,
jbe@23 681 // set 'subcmd' = false, if special character was a question-mark:
jbe/bsw@0 682 subcmd = (c == '$');
jbe@23 683 // read any number of alpha numeric chars or underscores
jbe@23 684 // and store them on Lua stack:
jbe/bsw@0 685 luaL_buffinit(L, &keybuf);
jbe/bsw@0 686 while (1) {
jbe/bsw@0 687 c = template[template_pos];
jbe/bsw@0 688 if (
jbe/bsw@0 689 (c < 'A' || c > 'Z') &&
jbe/bsw@0 690 (c < 'a' || c > 'z') &&
jbe/bsw@0 691 (c < '0' || c > '9') &&
jbe/bsw@0 692 (c != '_')
jbe/bsw@0 693 ) break;
jbe/bsw@0 694 luaL_addchar(&keybuf, c);
jbe/bsw@0 695 template_pos++;
jbe/bsw@0 696 }
jbe/bsw@0 697 luaL_pushresult(&keybuf);
jbe@23 698 // check, if any characters matched:
jbe@64 699 if (lua_rawlen(L, -1)) {
jbe@23 700 // if any alpha numeric chars or underscores were found,
jbe@23 701 // push them on stack as a Lua string and use them to lookup
jbe@23 702 // value from second argument:
jbe/bsw@0 703 lua_pushvalue(L, -1); // save key on stack
jbe@23 704 lua_gettable(L, 2); // fetch value (raw-value)
jbe/bsw@0 705 } else {
jbe@23 706 // otherwise push nil and use numeric lookup based on 'paramidx':
jbe/bsw@0 707 lua_pop(L, 1);
jbe/bsw@0 708 lua_pushnil(L); // put nil on key position
jbe@23 709 lua_rawgeti(L, 2, paramidx++); // fetch value (raw-value)
jbe/bsw@0 710 }
jbe@23 711 // Lua stack contains: ..., <buffer>, key, raw-value
jbe@23 712 // branch according to type of special character ("?" or "$"):
jbe@23 713 if (subcmd) { // dollar-sign
jbe/bsw@0 714 size_t i;
jbe/bsw@0 715 size_t count;
jbe@23 716 // store fetched value (which is supposed to be sub-structure)
jbe@23 717 // on Lua stack position 5 and drop key:
jbe@23 718 lua_replace(L, 5);
jbe@23 719 lua_pop(L, 1);
jbe@23 720 // Lua stack contains: ..., <buffer>
jbe@23 721 // check, if fetched value is really a sub-structure:
jbe/bsw@0 722 luaL_argcheck(L,
jbe/bsw@0 723 !lua_isnil(L, 5),
jbe/bsw@0 724 2,
jbe/bsw@0 725 "SQL sub-structure not found."
jbe/bsw@0 726 );
jbe/bsw@0 727 luaL_argcheck(L,
jbe/bsw@0 728 lua_type(L, 5) == LUA_TTABLE,
jbe/bsw@0 729 2,
jbe/bsw@0 730 "SQL sub-structure must be a table."
jbe/bsw@0 731 );
jbe@23 732 // Lua stack contains: ..., <buffer>
jbe@23 733 // get value of "sep" attribute of sub-structure,
jbe@23 734 // and place it on Lua stack position 6:
jbe/bsw@0 735 lua_getfield(L, 5, "sep");
jbe@23 736 lua_replace(L, 6);
jbe@23 737 // if seperator is nil, then use ", " as default,
jbe@23 738 // if seperator is neither nil nor a string, then throw error:
jbe/bsw@0 739 if (lua_isnil(L, 6)) {
jbe/bsw@0 740 lua_pushstring(L, ", ");
jbe/bsw@0 741 lua_replace(L, 6);
jbe/bsw@0 742 } else {
jbe/bsw@0 743 luaL_argcheck(L,
jbe/bsw@0 744 lua_isstring(L, 6),
jbe/bsw@0 745 2,
jbe/bsw@0 746 "Seperator of SQL sub-structure has to be a string."
jbe/bsw@0 747 );
jbe/bsw@0 748 }
jbe@23 749 // iterate over items of sub-structure:
jbe@64 750 count = lua_rawlen(L, 5);
jbe/bsw@0 751 for (i = 0; i < count; i++) {
jbe@23 752 // add seperator, unless this is the first run:
jbe/bsw@0 753 if (i) {
jbe/bsw@0 754 lua_pushvalue(L, 6);
jbe/bsw@0 755 luaL_addvalue(&buf);
jbe/bsw@0 756 }
jbe@23 757 // recursivly apply assemble function and add results to buffer:
jbe/bsw@0 758 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 759 lua_pushvalue(L, 1);
jbe/bsw@0 760 lua_rawgeti(L, 5, i+1);
jbe/bsw@0 761 lua_call(L, 2, 1);
jbe/bsw@0 762 luaL_addvalue(&buf);
jbe/bsw@0 763 }
jbe@23 764 } else { // question-mark
jbe/bsw@0 765 if (lua_toboolean(L, 4)) {
jbe@23 766 // call input_converter with connection handle, raw-value and
jbe@23 767 // an info-table which contains a "field_name" entry with the
jbe@23 768 // used key:
jbe/bsw@0 769 lua_pushvalue(L, 4);
jbe/bsw@0 770 lua_pushvalue(L, 1);
jbe/bsw@0 771 lua_pushvalue(L, -3);
jbe/bsw@0 772 lua_newtable(L);
jbe/bsw@0 773 lua_pushvalue(L, -6);
jbe/bsw@0 774 lua_setfield(L, -2, "field_name");
jbe/bsw@0 775 lua_call(L, 3, 1);
jbe@23 776 // Lua stack contains: ..., <buffer>, key, raw-value, final-value
jbe@23 777 // remove key and raw-value:
jbe/bsw@0 778 lua_remove(L, -2);
jbe/bsw@0 779 lua_remove(L, -2);
jbe@23 780 // Lua stack contains: ..., <buffer>, final-value
jbe@23 781 // throw error, if final-value is not a string:
jbe/bsw@0 782 if (!lua_isstring(L, -1)) {
jbe/bsw@0 783 return luaL_error(L, "input_converter returned non-string.");
jbe/bsw@0 784 }
jbe/bsw@0 785 } else {
jbe@23 786 // remove key from stack:
jbe/bsw@0 787 lua_remove(L, -2);
jbe@23 788 // Lua stack contains: ..., <buffer>, raw-value
jbe@23 789 // branch according to type of value:
jbe@23 790 if (lua_isnil(L, -1)) { // value is nil
jbe@23 791 // push string "NULL" to stack:
jbe/bsw@0 792 lua_pushliteral(L, "NULL");
jbe@23 793 } else if (lua_type(L, -1) == LUA_TBOOLEAN) { // value is boolean
jbe@23 794 // push strings "TRUE" or "FALSE" to stack:
jbe/bsw@0 795 lua_pushstring(L, lua_toboolean(L, -1) ? "TRUE" : "FALSE");
jbe@23 796 } else if (lua_isstring(L, -1)) { // value is string or number
jbe/bsw@0 797 // NOTE: In this version of lua a number will be converted
jbe@23 798 // push output of "quote_string" method of database
jbe@23 799 // connection to stack:
jbe/bsw@0 800 lua_tostring(L, -1);
jbe/bsw@0 801 lua_pushcfunction(L, mondelefant_conn_quote_string);
jbe/bsw@0 802 lua_pushvalue(L, 1);
jbe/bsw@0 803 lua_pushvalue(L, -3);
jbe/bsw@0 804 lua_call(L, 2, 1);
jbe@23 805 } else { // value is of other type
jbe@23 806 // throw error:
jbe/bsw@0 807 return luaL_error(L,
jbe/bsw@0 808 "Unable to convert SQL value due to unknown type "
jbe/bsw@0 809 "or missing input_converter."
jbe/bsw@0 810 );
jbe/bsw@0 811 }
jbe@23 812 // Lua stack contains: ..., <buffer>, raw-value, final-value
jbe@23 813 // remove raw-value:
jbe/bsw@0 814 lua_remove(L, -2);
jbe@23 815 // Lua stack contains: ..., <buffer>, final-value
jbe/bsw@0 816 }
jbe@23 817 // append final-value to buffer:
jbe/bsw@0 818 luaL_addvalue(&buf);
jbe/bsw@0 819 }
jbe/bsw@0 820 }
jbe@23 821 } else { // character is not special
jbe@23 822 // just copy character:
jbe/bsw@0 823 luaL_addchar(&buf, c);
jbe/bsw@0 824 }
jbe/bsw@0 825 }
jbe@23 826 // return string in buffer:
jbe/bsw@0 827 luaL_pushresult(&buf);
jbe/bsw@0 828 return 1;
jbe/bsw@0 829 }
jbe/bsw@0 830
jbe@23 831 // max number of SQL statements executed by one "query" method call:
jbe/bsw@0 832 #define MONDELEFANT_MAX_COMMAND_COUNT 64
jbe@23 833 // max number of columns in a database result:
jbe/bsw@0 834 #define MONDELEFANT_MAX_COLUMN_COUNT 1024
jbe@23 835 // enum values for 'modes' array in C-function below:
jbe/bsw@0 836 #define MONDELEFANT_QUERY_MODE_LIST 1
jbe/bsw@0 837 #define MONDELEFANT_QUERY_MODE_OBJECT 2
jbe/bsw@0 838 #define MONDELEFANT_QUERY_MODE_OPT_OBJECT 3
jbe/bsw@0 839
jbe@23 840 // method "try_query" of database handles:
jbe/bsw@0 841 static int mondelefant_conn_try_query(lua_State *L) {
jbe/bsw@0 842 mondelefant_conn_t *conn;
jbe/bsw@0 843 int command_count;
jbe/bsw@0 844 int command_idx;
jbe/bsw@0 845 int modes[MONDELEFANT_MAX_COMMAND_COUNT];
jbe/bsw@0 846 luaL_Buffer buf;
jbe/bsw@0 847 int sent_success;
jbe/bsw@0 848 PGresult *res;
jbe/bsw@0 849 int rows, cols, row, col;
jbe@23 850 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 851 conn = mondelefant_get_conn(L, 1);
jbe@23 852 // calculate number of commands (2 arguments for one command):
jbe/bsw@0 853 command_count = lua_gettop(L) / 2;
jbe@23 854 // push nil on stack, which is needed, if last mode was ommitted:
jbe@23 855 lua_pushnil(L);
jbe@23 856 // throw error, if number of commands is too high:
jbe/bsw@0 857 if (command_count > MONDELEFANT_MAX_COMMAND_COUNT) {
jbe/bsw@0 858 return luaL_error(L, "Exceeded maximum command count in one query.");
jbe/bsw@0 859 }
jbe@23 860 // create SQL string, store query modes and push SQL string on stack:
jbe/bsw@0 861 luaL_buffinit(L, &buf);
jbe/bsw@0 862 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 863 int mode;
jbe/bsw@0 864 int mode_idx; // stack index of mode string
jbe/bsw@0 865 if (command_idx) luaL_addchar(&buf, ' ');
jbe/bsw@0 866 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 867 lua_pushvalue(L, 1);
jbe/bsw@0 868 lua_pushvalue(L, 2 + 2 * command_idx);
jbe/bsw@0 869 lua_call(L, 2, 1);
jbe/bsw@0 870 luaL_addvalue(&buf);
jbe/bsw@0 871 luaL_addchar(&buf, ';');
jbe/bsw@0 872 mode_idx = 3 + 2 * command_idx;
jbe/bsw@0 873 if (lua_isnil(L, mode_idx)) {
jbe/bsw@0 874 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 875 } else {
jbe/bsw@0 876 const char *modestr;
jbe/bsw@0 877 modestr = luaL_checkstring(L, mode_idx);
jbe/bsw@0 878 if (!strcmp(modestr, "list")) {
jbe/bsw@0 879 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 880 } else if (!strcmp(modestr, "object")) {
jbe/bsw@0 881 mode = MONDELEFANT_QUERY_MODE_OBJECT;
jbe/bsw@0 882 } else if (!strcmp(modestr, "opt_object")) {
jbe/bsw@0 883 mode = MONDELEFANT_QUERY_MODE_OPT_OBJECT;
jbe/bsw@0 884 } else {
jbe@397 885 return luaL_argerror(L, mode_idx, "unknown query mode");
jbe/bsw@0 886 }
jbe/bsw@0 887 }
jbe/bsw@0 888 modes[command_idx] = mode;
jbe/bsw@0 889 }
jbe/bsw@0 890 luaL_pushresult(&buf); // stack position unknown
jbe/bsw@0 891 lua_replace(L, 2); // SQL command string to stack position 2
jbe@23 892 // call sql_tracer, if set:
jbe/bsw@0 893 lua_settop(L, 2);
jbe/bsw@0 894 lua_getfield(L, 1, "sql_tracer"); // tracer at stack position 3
jbe/bsw@0 895 if (lua_toboolean(L, 3)) {
jbe/bsw@0 896 lua_pushvalue(L, 1); // 4
jbe/bsw@0 897 lua_pushvalue(L, 2); // 5
jbe/bsw@0 898 lua_call(L, 2, 1); // trace callback at stack position 3
jbe/bsw@0 899 }
jbe@23 900 // NOTE: If no tracer was found, then nil or false is stored at stack
jbe@23 901 // position 3.
jbe@23 902 // call PQsendQuery function and store result in 'sent_success' variable:
jbe/bsw@0 903 sent_success = PQsendQuery(conn->pgconn, lua_tostring(L, 2));
jbe@23 904 // create preliminary result table:
jbe/bsw@0 905 lua_newtable(L); // results in table at stack position 4
jbe@23 906 // iterate over results using function PQgetResult to fill result table:
jbe/bsw@0 907 for (command_idx = 0; ; command_idx++) {
jbe/bsw@0 908 int mode;
jbe/bsw@0 909 char binary[MONDELEFANT_MAX_COLUMN_COUNT];
jbe/bsw@0 910 ExecStatusType pgstatus;
jbe@23 911 // fetch mode which was given for the command:
jbe/bsw@0 912 mode = modes[command_idx];
jbe@23 913 // if PQsendQuery call was successful, then fetch result data:
jbe/bsw@0 914 if (sent_success) {
jbe@23 915 // NOTE: PQgetResult called one extra time. Break only, if all
jbe@23 916 // queries have been processed and PQgetResult returned NULL.
jbe/bsw@0 917 res = PQgetResult(conn->pgconn);
jbe/bsw@0 918 if (command_idx >= command_count && !res) break;
jbe/bsw@0 919 if (res) {
jbe/bsw@0 920 pgstatus = PQresultStatus(res);
jbe/bsw@0 921 rows = PQntuples(res);
jbe/bsw@0 922 cols = PQnfields(res);
jbe/bsw@0 923 }
jbe/bsw@0 924 }
jbe@23 925 // handle errors:
jbe/bsw@0 926 if (
jbe/bsw@0 927 !sent_success || command_idx >= command_count || !res ||
jbe/bsw@0 928 (pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK) ||
jbe/bsw@0 929 (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) ||
jbe/bsw@0 930 (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST)
jbe/bsw@0 931 ) {
jbe/bsw@0 932 const char *command;
jbe/bsw@0 933 command = lua_tostring(L, 2);
jbe/bsw@0 934 lua_newtable(L); // 5
jbe@406 935 luaL_setmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY);
jbe/bsw@0 936 lua_pushvalue(L, 1);
jbe/bsw@0 937 lua_setfield(L, 5, "connection");
jbe/bsw@0 938 lua_pushvalue(L, 2);
jbe/bsw@0 939 lua_setfield(L, 5, "sql_command");
jbe@397 940 if (!sent_success) {
jbe@397 941 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe/bsw@0 942 lua_setfield(L, 5, "code");
jbe@397 943 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn));
jbe/bsw@0 944 lua_setfield(L, 5, "message");
jbe/bsw@0 945 } else {
jbe@397 946 lua_pushinteger(L, command_idx + 1);
jbe@397 947 lua_setfield(L, 5, "command_number");
jbe@397 948 if (!res) {
jbe@397 949 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_LOW);
jbe@397 950 lua_setfield(L, 5, "code");
jbe@397 951 lua_pushliteral(L, "Received too few database result sets.");
jbe@397 952 lua_setfield(L, 5, "message");
jbe@397 953 } else if (command_idx >= command_count) {
jbe@397 954 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH);
jbe@397 955 lua_setfield(L, 5, "code");
jbe@397 956 lua_pushliteral(L, "Received too many database result sets.");
jbe@397 957 lua_setfield(L, 5, "message");
jbe@397 958 } else if (
jbe@397 959 pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK
jbe@397 960 ) {
jbe@397 961 const char *sqlstate;
jbe@397 962 const char *errmsg;
jbe@397 963 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SEVERITY));
jbe@397 964 lua_setfield(L, 5, "pg_severity");
jbe@397 965 sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
jbe@397 966 if (sqlstate) {
jbe@397 967 lua_pushstring(L, sqlstate);
jbe@397 968 lua_setfield(L, 5, "pg_sqlstate");
jbe@397 969 lua_pushstring(L, mondelefant_translate_errcode(sqlstate));
jbe@397 970 lua_setfield(L, 5, "code");
jbe@397 971 } else {
jbe@397 972 lua_pushliteral(L, MONDELEFANT_ERRCODE_UNKNOWN);
jbe@397 973 lua_setfield(L, 5, "code");
jbe@397 974 }
jbe@397 975 errmsg = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
jbe@397 976 if (errmsg) {
jbe@397 977 mondelefant_push_first_line(L, errmsg);
jbe@397 978 lua_setfield(L, 5, "message");
jbe@397 979 lua_pushstring(L, errmsg);
jbe@397 980 lua_setfield(L, 5, "pg_message_primary");
jbe@397 981 } else {
jbe@397 982 lua_pushliteral(L,
jbe@397 983 "Error while fetching result, but no error message given."
jbe@397 984 );
jbe@397 985 lua_setfield(L, 5, "message");
jbe@397 986 }
jbe@397 987 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL));
jbe@397 988 lua_setfield(L, 5, "pg_message_detail");
jbe@397 989 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_HINT));
jbe@397 990 lua_setfield(L, 5, "pg_message_hint");
jbe@397 991 // NOTE: "position" and "pg_internal_position" are recalculated to
jbe@397 992 // byte offsets, as Lua 5.2 is not Unicode aware.
jbe@397 993 {
jbe@397 994 char *tmp;
jbe@397 995 tmp = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
jbe@397 996 if (tmp) {
jbe@397 997 int pos;
jbe@397 998 pos = atoi(tmp) - 1;
jbe@397 999 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1000 pos = utf8_position_to_byte(command, pos);
jbe@397 1001 }
jbe@397 1002 lua_pushinteger(L, pos + 1);
jbe@397 1003 lua_setfield(L, 5, "position");
jbe@397 1004 }
jbe@397 1005 }
jbe@397 1006 {
jbe@397 1007 const char *internal_query;
jbe@397 1008 internal_query = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
jbe@397 1009 lua_pushstring(L, internal_query);
jbe@397 1010 lua_setfield(L, 5, "pg_internal_query");
jbe@397 1011 char *tmp;
jbe@397 1012 tmp = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
jbe@397 1013 if (tmp) {
jbe@397 1014 int pos;
jbe@397 1015 pos = atoi(tmp) - 1;
jbe@397 1016 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1017 pos = utf8_position_to_byte(internal_query, pos);
jbe@397 1018 }
jbe@397 1019 lua_pushinteger(L, pos + 1);
jbe@397 1020 lua_setfield(L, 5, "pg_internal_position");
jbe@397 1021 }
jbe@397 1022 }
jbe@397 1023 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_CONTEXT));
jbe@397 1024 lua_setfield(L, 5, "pg_context");
jbe@397 1025 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FILE));
jbe@397 1026 lua_setfield(L, 5, "pg_source_file");
jbe@397 1027 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_LINE));
jbe@397 1028 lua_setfield(L, 5, "pg_source_line");
jbe@397 1029 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION));
jbe@397 1030 lua_setfield(L, 5, "pg_source_function");
jbe@397 1031 } else if (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) {
jbe@397 1032 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_NO_ROWS);
jbe@397 1033 lua_setfield(L, 5, "code");
jbe@397 1034 lua_pushliteral(L, "Expected one row, but got empty set.");
jbe@397 1035 lua_setfield(L, 5, "message");
jbe@397 1036 } else if (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST) {
jbe@397 1037 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS);
jbe@397 1038 lua_setfield(L, 5, "code");
jbe@397 1039 lua_pushliteral(L, "Got more than one result row.");
jbe@397 1040 lua_setfield(L, 5, "message");
jbe@397 1041 } else {
jbe@397 1042 // should not happen
jbe@397 1043 abort();
jbe@397 1044 }
jbe@397 1045 if (res) {
jbe@397 1046 PQclear(res);
jbe@397 1047 while ((res = PQgetResult(conn->pgconn))) PQclear(res);
jbe@397 1048 }
jbe/bsw@0 1049 }
jbe/bsw@0 1050 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1051 lua_pushvalue(L, 3);
jbe/bsw@0 1052 lua_pushvalue(L, 5);
jbe/bsw@0 1053 lua_call(L, 1, 0);
jbe/bsw@0 1054 }
jbe/bsw@0 1055 return 1;
jbe/bsw@0 1056 }
jbe@23 1057 // call "create_list" or "create_object" method of database handle,
jbe@23 1058 // result will be at stack position 5:
jbe/bsw@0 1059 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1060 lua_pushcfunction(L, mondelefant_conn_create_list); // 5
jbe/bsw@0 1061 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1062 lua_call(L, 1, 1); // 5
jbe/bsw@0 1063 } else {
jbe/bsw@0 1064 lua_pushcfunction(L, mondelefant_conn_create_object); // 5
jbe/bsw@0 1065 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1066 lua_call(L, 1, 1); // 5
jbe/bsw@0 1067 }
jbe@23 1068 // set "_column_info":
jbe@23 1069 lua_newtable(L); // 6
jbe/bsw@0 1070 for (col = 0; col < cols; col++) {
jbe/bsw@0 1071 lua_newtable(L); // 7
jbe@380 1072 lua_pushstring(L, PQfname(res, col)); // 8
jbe@380 1073 lua_pushvalue(L, 8); // 9
jbe@380 1074 lua_pushvalue(L, 7); // 10
jbe@380 1075 lua_rawset(L, 6);
jbe/bsw@0 1076 lua_setfield(L, 7, "field_name");
jbe@380 1077 // _column_info entry (for current column) on stack position 7
jbe/bsw@0 1078 {
jbe/bsw@0 1079 Oid tmp;
jbe/bsw@0 1080 tmp = PQftable(res, col);
jbe/bsw@0 1081 if (tmp == InvalidOid) lua_pushnil(L);
jbe/bsw@0 1082 else lua_pushinteger(L, tmp);
jbe/bsw@0 1083 lua_setfield(L, 7, "table_oid");
jbe/bsw@0 1084 }
jbe/bsw@0 1085 {
jbe/bsw@0 1086 int tmp;
jbe/bsw@0 1087 tmp = PQftablecol(res, col);
jbe/bsw@0 1088 if (tmp == 0) lua_pushnil(L);
jbe/bsw@0 1089 else lua_pushinteger(L, tmp);
jbe/bsw@0 1090 lua_setfield(L, 7, "table_column_number");
jbe/bsw@0 1091 }
jbe/bsw@0 1092 {
jbe/bsw@0 1093 Oid tmp;
jbe/bsw@0 1094 tmp = PQftype(res, col);
jbe/bsw@0 1095 binary[col] = (tmp == MONDELEFANT_POSTGRESQL_BINARY_OID);
jbe/bsw@0 1096 lua_pushinteger(L, tmp);
jbe/bsw@0 1097 lua_setfield(L, 7, "type_oid");
jbe/bsw@0 1098 lua_pushstring(L, mondelefant_oid_to_typestr(tmp));
jbe/bsw@0 1099 lua_setfield(L, 7, "type");
jbe/bsw@0 1100 }
jbe/bsw@0 1101 {
jbe/bsw@0 1102 int tmp;
jbe/bsw@0 1103 tmp = PQfmod(res, col);
jbe/bsw@0 1104 if (tmp == -1) lua_pushnil(L);
jbe/bsw@0 1105 else lua_pushinteger(L, tmp);
jbe/bsw@0 1106 lua_setfield(L, 7, "type_modifier");
jbe/bsw@0 1107 }
jbe/bsw@0 1108 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1109 }
jbe@23 1110 lua_setfield(L, 5, "_column_info");
jbe@23 1111 // set "_rows_affected":
jbe/bsw@0 1112 {
jbe/bsw@0 1113 char *tmp;
jbe/bsw@0 1114 tmp = PQcmdTuples(res);
jbe/bsw@0 1115 if (tmp[0]) {
jbe/bsw@0 1116 lua_pushinteger(L, atoi(tmp));
jbe/bsw@0 1117 lua_setfield(L, 5, "_rows_affected");
jbe/bsw@0 1118 }
jbe/bsw@0 1119 }
jbe@23 1120 // set "_oid":
jbe/bsw@0 1121 {
jbe/bsw@0 1122 Oid tmp;
jbe/bsw@0 1123 tmp = PQoidValue(res);
jbe/bsw@0 1124 if (tmp != InvalidOid) {
jbe/bsw@0 1125 lua_pushinteger(L, tmp);
jbe/bsw@0 1126 lua_setfield(L, 5, "_oid");
jbe/bsw@0 1127 }
jbe/bsw@0 1128 }
jbe@23 1129 // copy data as strings or nil, while performing binary unescaping
jbe@23 1130 // automatically:
jbe/bsw@0 1131 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1132 for (row = 0; row < rows; row++) {
jbe/bsw@0 1133 lua_pushcfunction(L, mondelefant_conn_create_object); // 6
jbe/bsw@0 1134 lua_pushvalue(L, 1); // 7
jbe/bsw@0 1135 lua_call(L, 1, 1); // 6
jbe/bsw@0 1136 for (col = 0; col < cols; col++) {
jbe/bsw@0 1137 if (PQgetisnull(res, row, col)) {
jbe/bsw@0 1138 lua_pushnil(L);
jbe/bsw@0 1139 } else if (binary[col]) {
jbe/bsw@0 1140 size_t binlen;
jbe/bsw@0 1141 char *binval;
jbe/bsw@0 1142 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1143 (unsigned char *)PQgetvalue(res, row, col), &binlen
jbe/bsw@0 1144 );
jbe/bsw@0 1145 if (!binval) {
jbe/bsw@0 1146 return luaL_error(L,
jbe/bsw@0 1147 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1148 );
jbe/bsw@0 1149 }
jbe/bsw@0 1150 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1151 PQfreemem(binval);
jbe/bsw@0 1152 } else {
jbe/bsw@0 1153 lua_pushstring(L, PQgetvalue(res, row, col));
jbe/bsw@0 1154 }
jbe/bsw@0 1155 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1156 }
jbe/bsw@0 1157 lua_rawseti(L, 5, row+1);
jbe/bsw@0 1158 }
jbe/bsw@0 1159 } else if (rows == 1) {
jbe/bsw@0 1160 for (col = 0; col < cols; col++) {
jbe/bsw@0 1161 if (PQgetisnull(res, 0, col)) {
jbe/bsw@0 1162 lua_pushnil(L);
jbe/bsw@0 1163 } else if (binary[col]) {
jbe/bsw@0 1164 size_t binlen;
jbe/bsw@0 1165 char *binval;
jbe/bsw@0 1166 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1167 (unsigned char *)PQgetvalue(res, 0, col), &binlen
jbe/bsw@0 1168 );
jbe/bsw@0 1169 if (!binval) {
jbe/bsw@0 1170 return luaL_error(L,
jbe/bsw@0 1171 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1172 );
jbe/bsw@0 1173 }
jbe/bsw@0 1174 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1175 PQfreemem(binval);
jbe/bsw@0 1176 } else {
jbe/bsw@0 1177 lua_pushstring(L, PQgetvalue(res, 0, col));
jbe/bsw@0 1178 }
jbe/bsw@0 1179 lua_rawseti(L, 5, col+1);
jbe/bsw@0 1180 }
jbe/bsw@0 1181 } else {
jbe/bsw@0 1182 // no row in optrow mode
jbe/bsw@0 1183 lua_pop(L, 1);
jbe/bsw@0 1184 lua_pushnil(L);
jbe/bsw@0 1185 }
jbe@23 1186 // save result in result list:
jbe/bsw@0 1187 lua_rawseti(L, 4, command_idx+1);
jbe@23 1188 // extra assertion:
jbe/bsw@0 1189 if (lua_gettop(L) != 4) abort(); // should not happen
jbe@23 1190 // free memory acquired by libpq:
jbe/bsw@0 1191 PQclear(res);
jbe/bsw@0 1192 }
jbe/bsw@0 1193 // trace callback at stack position 3
jbe/bsw@0 1194 // result at stack position 4 (top of stack)
jbe@23 1195 // if a trace callback is existent, then call:
jbe/bsw@0 1196 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1197 lua_pushvalue(L, 3);
jbe/bsw@0 1198 lua_call(L, 0, 0);
jbe/bsw@0 1199 }
jbe@23 1200 // put result at stack position 3:
jbe@23 1201 lua_replace(L, 3);
jbe@23 1202 // get output converter to stack position 4:
jbe@23 1203 lua_getfield(L, 1, "output_converter");
jbe@374 1204 // get mutability state saver to stack position 5:
jbe@375 1205 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe@375 1206 lua_getfield(L, -1, "save_mutability_state");
jbe@375 1207 lua_replace(L, -2);
jbe@23 1208 // apply output converters and fill "_data" table according to column names:
jbe/bsw@0 1209 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1210 int mode;
jbe/bsw@0 1211 mode = modes[command_idx];
jbe@374 1212 lua_rawgeti(L, 3, command_idx+1); // raw result at stack position 6
jbe@374 1213 if (lua_toboolean(L, 6)) {
jbe@374 1214 lua_getfield(L, 6, "_column_info"); // column_info list at position 7
jbe@374 1215 cols = lua_rawlen(L, 7);
jbe/bsw@0 1216 if (mode == MONDELEFANT_QUERY_MODE_LIST) {
jbe@374 1217 rows = lua_rawlen(L, 6);
jbe/bsw@0 1218 for (row = 0; row < rows; row++) {
jbe@374 1219 lua_rawgeti(L, 6, row+1); // row at stack position 8
jbe@374 1220 lua_getfield(L, 8, "_data"); // _data table at stack position 9
jbe@375 1221 lua_getfield(L, 8, "_dirty"); // _dirty table at stack position 10
jbe/bsw@0 1222 for (col = 0; col < cols; col++) {
jbe@375 1223 lua_rawgeti(L, 7, col+1); // this column info at position 11
jbe@375 1224 lua_getfield(L, 11, "field_name"); // 12
jbe/bsw@0 1225 if (lua_toboolean(L, 4)) {
jbe/bsw@0 1226 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0 1227 lua_pushvalue(L, 1); // connection
jbe@374 1228 lua_rawgeti(L, 8, col+1); // raw-value
jbe@375 1229 lua_pushvalue(L, 11); // this column info
jbe@375 1230 lua_call(L, 3, 1); // converted value at position 13
jbe/bsw@0 1231 } else {
jbe@375 1232 lua_rawgeti(L, 8, col+1); // raw-value at position 13
jbe/bsw@0 1233 }
jbe@375 1234 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375 1235 lua_pushvalue(L, 12); // copy of field name
jbe@375 1236 lua_pushvalue(L, 5); // mutability state saver function
jbe@375 1237 lua_pushvalue(L, 13); // copy of value
jbe@375 1238 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375 1239 lua_rawset(L, 10); // store mutability state in _dirty table
jbe@375 1240 }
jbe@375 1241 lua_pushvalue(L, 13); // 14
jbe@374 1242 lua_rawseti(L, 8, col+1);
jbe@374 1243 lua_rawset(L, 9);
jbe@399 1244 lua_settop(L, 10);
jbe/bsw@0 1245 }
jbe@374 1246 lua_settop(L, 7);
jbe/bsw@0 1247 }
jbe/bsw@0 1248 } else {
jbe@374 1249 lua_getfield(L, 6, "_data"); // _data table at stack position 8
jbe@375 1250 lua_getfield(L, 6, "_dirty"); // _dirty table at stack position 9
jbe/bsw@0 1251 for (col = 0; col < cols; col++) {
jbe@375 1252 lua_rawgeti(L, 7, col+1); // this column info at position 10
jbe@375 1253 lua_getfield(L, 10, "field_name"); // 11
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, 6, col+1); // raw-value
jbe@375 1258 lua_pushvalue(L, 10); // this column info
jbe@375 1259 lua_call(L, 3, 1); // converted value at position 12
jbe/bsw@0 1260 } else {
jbe@375 1261 lua_rawgeti(L, 6, col+1); // raw-value at position 12
jbe/bsw@0 1262 }
jbe@375 1263 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375 1264 lua_pushvalue(L, 11); // copy of field name
jbe@375 1265 lua_pushvalue(L, 5); // mutability state saver function
jbe@375 1266 lua_pushvalue(L, 12); // copy of value
jbe@375 1267 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375 1268 lua_rawset(L, 9); // store mutability state in _dirty table
jbe@375 1269 }
jbe@375 1270 lua_pushvalue(L, 12); // 13
jbe@374 1271 lua_rawseti(L, 6, col+1);
jbe@374 1272 lua_rawset(L, 8);
jbe@399 1273 lua_settop(L, 9);
jbe/bsw@0 1274 }
jbe/bsw@0 1275 }
jbe/bsw@0 1276 }
jbe@374 1277 lua_settop(L, 5);
jbe/bsw@0 1278 }
jbe@23 1279 // return nil as first result value, followed by result lists/objects:
jbe/bsw@0 1280 lua_settop(L, 3);
jbe/bsw@0 1281 lua_pushnil(L);
jbe/bsw@0 1282 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1283 lua_rawgeti(L, 3, command_idx+1);
jbe/bsw@0 1284 }
jbe/bsw@0 1285 return command_count+1;
jbe/bsw@0 1286 }
jbe/bsw@0 1287
jbe@397 1288 // method "is_kind_of" of error objects:
jbe@397 1289 static int mondelefant_errorobject_is_kind_of(lua_State *L) {
jbe@397 1290 const char *errclass;
jbe@397 1291 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397 1292 errclass = luaL_checkstring(L, 2);
jbe@397 1293 lua_settop(L, 2);
jbe@397 1294 lua_getfield(L, 1, "code"); // 3
jbe@397 1295 luaL_argcheck(L,
jbe@397 1296 lua_type(L, 3) == LUA_TSTRING,
jbe@397 1297 1,
jbe@397 1298 "field 'code' of error object is not a string"
jbe@397 1299 );
jbe@397 1300 lua_pushboolean(L,
jbe@397 1301 mondelefant_check_error_class(lua_tostring(L, 3), errclass)
jbe@397 1302 );
jbe@397 1303 return 1;
jbe@397 1304 }
jbe@397 1305
jbe@397 1306 // method "wait" of database handles:
jbe@397 1307 static int mondelefant_conn_wait(lua_State *L) {
jbe@397 1308 int argc;
jbe@397 1309 // count number of arguments:
jbe@397 1310 argc = lua_gettop(L);
jbe@397 1311 // insert "try_wait" function/method at stack position 1:
jbe@397 1312 lua_pushcfunction(L, mondelefant_conn_try_wait);
jbe@397 1313 lua_insert(L, 1);
jbe@397 1314 // call "try_wait" method:
jbe@397 1315 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@397 1316 // check, if error occurred:
jbe@397 1317 if (lua_toboolean(L, 1)) {
jbe@397 1318 // raise error
jbe/bsw@0 1319 lua_settop(L, 1);
jbe/bsw@0 1320 return lua_error(L);
jbe/bsw@0 1321 } else {
jbe@397 1322 // return everything but nil error object:
jbe@397 1323 return lua_gettop(L) - 1;
jbe/bsw@0 1324 }
jbe/bsw@0 1325 }
jbe/bsw@0 1326
jbe@23 1327 // method "query" of database handles:
jbe/bsw@0 1328 static int mondelefant_conn_query(lua_State *L) {
jbe/bsw@0 1329 int argc;
jbe@23 1330 // count number of arguments:
jbe/bsw@0 1331 argc = lua_gettop(L);
jbe@23 1332 // insert "try_query" function/method at stack position 1:
jbe/bsw@0 1333 lua_pushcfunction(L, mondelefant_conn_try_query);
jbe@23 1334 lua_insert(L, 1);
jbe@23 1335 // call "try_query" method:
jbe@23 1336 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@23 1337 // check, if error occurred:
jbe@23 1338 if (lua_toboolean(L, 1)) {
jbe@397 1339 // raise error
jbe@397 1340 lua_settop(L, 1);
jbe@397 1341 return lua_error(L);
jbe/bsw@0 1342 } else {
jbe@23 1343 // return everything but nil error object:
jbe@23 1344 return lua_gettop(L) - 1;
jbe/bsw@0 1345 }
jbe/bsw@0 1346 }
jbe/bsw@0 1347
jbe@23 1348 // library function "set_class":
jbe/bsw@0 1349 static int mondelefant_set_class(lua_State *L) {
jbe@23 1350 // ensure that first argument is a database result list/object:
jbe/bsw@0 1351 lua_settop(L, 2);
jbe/bsw@0 1352 lua_getmetatable(L, 1); // 3
jbe/bsw@0 1353 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 4
jbe@64 1354 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 1, "not a database result");
jbe@23 1355 // ensure that second argument is a database class (model):
jbe/bsw@0 1356 lua_settop(L, 2);
jbe/bsw@0 1357 lua_getmetatable(L, 2); // 3
jbe/bsw@0 1358 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 4
jbe@64 1359 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 2, "not a database class");
jbe@23 1360 // set attribute "_class" of result list/object to given class:
jbe/bsw@0 1361 lua_settop(L, 2);
jbe/bsw@0 1362 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1363 lua_setfield(L, 1, "_class");
jbe@23 1364 // test, if database result is a list (and not a single object):
jbe/bsw@0 1365 lua_getfield(L, 1, "_type"); // 3
jbe/bsw@0 1366 lua_pushliteral(L, "list"); // 4
jbe/bsw@0 1367 if (lua_rawequal(L, 3, 4)) {
jbe/bsw@0 1368 int i;
jbe@23 1369 // set attribute "_class" of all elements to given class:
jbe@64 1370 for (i=0; i < lua_rawlen(L, 1); i++) {
jbe/bsw@0 1371 lua_settop(L, 2);
jbe/bsw@0 1372 lua_rawgeti(L, 1, i+1); // 3
jbe/bsw@0 1373 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1374 lua_setfield(L, 3, "_class");
jbe/bsw@0 1375 }
jbe/bsw@0 1376 }
jbe@23 1377 // return first argument:
jbe/bsw@0 1378 lua_settop(L, 1);
jbe/bsw@0 1379 return 1;
jbe/bsw@0 1380 }
jbe/bsw@0 1381
jbe@23 1382 // library function "new_class":
jbe/bsw@0 1383 static int mondelefant_new_class(lua_State *L) {
jbe@397 1384 // if no argument is given, use an empty table:
jbe@397 1385 if (lua_isnoneornil(L, 1)) {
jbe/bsw@0 1386 lua_settop(L, 0);
jbe/bsw@0 1387 lua_newtable(L); // 1
jbe@397 1388 } else {
jbe@397 1389 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397 1390 lua_settop(L, 1);
jbe/bsw@0 1391 }
jbe@23 1392 // set meta-table for database classes (models):
jbe@406 1393 luaL_setmetatable(L, MONDELEFANT_CLASS_MT_REGKEY);
jbe@23 1394 // check, if "prototype" attribute is not set:
jbe/bsw@0 1395 lua_pushliteral(L, "prototype"); // 2
jbe/bsw@0 1396 lua_rawget(L, 1); // 2
jbe/bsw@0 1397 if (!lua_toboolean(L, 2)) {
jbe@23 1398 // set "prototype" attribute to default prototype:
jbe/bsw@0 1399 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1400 lua_getfield(L,
jbe/bsw@0 1401 LUA_REGISTRYINDEX,
jbe/bsw@0 1402 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1403 ); // 4
jbe/bsw@0 1404 lua_rawset(L, 1);
jbe/bsw@0 1405 }
jbe@23 1406 // set "object" attribute to empty table, unless it is already set:
jbe/bsw@0 1407 lua_settop(L, 1);
jbe/bsw@0 1408 lua_pushliteral(L, "object"); // 2
jbe/bsw@0 1409 lua_rawget(L, 1); // 2
jbe/bsw@0 1410 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1411 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 1412 lua_newtable(L); // 4
jbe/bsw@0 1413 lua_rawset(L, 1);
jbe/bsw@0 1414 }
jbe@23 1415 // set "object_get" attribute to empty table, unless it is already set:
jbe/bsw@0 1416 lua_settop(L, 1);
jbe/bsw@0 1417 lua_pushliteral(L, "object_get"); // 2
jbe/bsw@0 1418 lua_rawget(L, 1); // 2
jbe/bsw@0 1419 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1420 lua_pushliteral(L, "object_get"); // 3
jbe/bsw@0 1421 lua_newtable(L); // 4
jbe/bsw@0 1422 lua_rawset(L, 1);
jbe/bsw@0 1423 }
jbe@23 1424 // set "object_set" attribute to empty table, unless it is already set:
jbe/bsw@0 1425 lua_settop(L, 1);
jbe/bsw@0 1426 lua_pushliteral(L, "object_set"); // 2
jbe/bsw@0 1427 lua_rawget(L, 1); // 2
jbe/bsw@0 1428 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1429 lua_pushliteral(L, "object_set"); // 3
jbe/bsw@0 1430 lua_newtable(L); // 4
jbe/bsw@0 1431 lua_rawset(L, 1);
jbe/bsw@0 1432 }
jbe@23 1433 // set "list" attribute to empty table, unless it is already set:
jbe/bsw@0 1434 lua_settop(L, 1);
jbe/bsw@0 1435 lua_pushliteral(L, "list"); // 2
jbe/bsw@0 1436 lua_rawget(L, 1); // 2
jbe/bsw@0 1437 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1438 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 1439 lua_newtable(L); // 4
jbe/bsw@0 1440 lua_rawset(L, 1);
jbe/bsw@0 1441 }
jbe@23 1442 // set "references" attribute to empty table, unless it is already set:
jbe/bsw@0 1443 lua_settop(L, 1);
jbe/bsw@0 1444 lua_pushliteral(L, "references"); // 2
jbe/bsw@0 1445 lua_rawget(L, 1); // 2
jbe/bsw@0 1446 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1447 lua_pushliteral(L, "references"); // 3
jbe/bsw@0 1448 lua_newtable(L); // 4
jbe/bsw@0 1449 lua_rawset(L, 1);
jbe/bsw@0 1450 }
jbe@23 1451 // set "foreign_keys" attribute to empty table, unless it is already set:
jbe/bsw@0 1452 lua_settop(L, 1);
jbe/bsw@0 1453 lua_pushliteral(L, "foreign_keys"); // 2
jbe/bsw@0 1454 lua_rawget(L, 1); // 2
jbe/bsw@0 1455 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1456 lua_pushliteral(L, "foreign_keys"); // 3
jbe/bsw@0 1457 lua_newtable(L); // 4
jbe/bsw@0 1458 lua_rawset(L, 1);
jbe/bsw@0 1459 }
jbe@23 1460 // return table:
jbe/bsw@0 1461 lua_settop(L, 1);
jbe/bsw@0 1462 return 1;
jbe/bsw@0 1463 }
jbe/bsw@0 1464
jbe@23 1465 // method "get_reference" of classes (models):
jbe/bsw@0 1466 static int mondelefant_class_get_reference(lua_State *L) {
jbe/bsw@0 1467 lua_settop(L, 2);
jbe/bsw@0 1468 while (lua_toboolean(L, 1)) {
jbe@23 1469 // get "references" table:
jbe/bsw@0 1470 lua_getfield(L, 1, "references"); // 3
jbe@23 1471 // perform lookup:
jbe/bsw@0 1472 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1473 lua_gettable(L, 3); // 4
jbe@23 1474 // return result, if lookup was successful:
jbe/bsw@0 1475 if (!lua_isnil(L, 4)) return 1;
jbe@23 1476 // replace current table by its prototype:
jbe/bsw@0 1477 lua_settop(L, 2);
jbe/bsw@0 1478 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1479 lua_rawget(L, 1); // 3
jbe/bsw@0 1480 lua_replace(L, 1);
jbe/bsw@0 1481 }
jbe@23 1482 // return nothing:
jbe/bsw@0 1483 return 0;
jbe/bsw@0 1484 }
jbe/bsw@0 1485
jbe@23 1486 // method "iterate_over_references" of classes (models):
jbe/bsw@0 1487 static int mondelefant_class_iterate_over_references(lua_State *L) {
jbe/bsw@0 1488 return luaL_error(L, "Reference iterator not implemented yet."); // TODO
jbe/bsw@0 1489 }
jbe/bsw@0 1490
jbe@23 1491 // method "get_foreign_key_reference_name" of classes (models):
jbe/bsw@0 1492 static int mondelefant_class_get_foreign_key_reference_name(lua_State *L) {
jbe/bsw@0 1493 lua_settop(L, 2);
jbe/bsw@0 1494 while (lua_toboolean(L, 1)) {
jbe@23 1495 // get "foreign_keys" table:
jbe/bsw@0 1496 lua_getfield(L, 1, "foreign_keys"); // 3
jbe@23 1497 // perform lookup:
jbe/bsw@0 1498 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1499 lua_gettable(L, 3); // 4
jbe@23 1500 // return result, if lookup was successful:
jbe/bsw@0 1501 if (!lua_isnil(L, 4)) return 1;
jbe@23 1502 // replace current table by its prototype:
jbe/bsw@0 1503 lua_settop(L, 2);
jbe/bsw@0 1504 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1505 lua_rawget(L, 1); // 3
jbe/bsw@0 1506 lua_replace(L, 1);
jbe/bsw@0 1507 }
jbe@23 1508 // return nothing:
jbe/bsw@0 1509 return 0;
jbe/bsw@0 1510 }
jbe/bsw@0 1511
jbe@23 1512 // meta-method "__index" of database result lists and objects:
jbe/bsw@0 1513 static int mondelefant_result_index(lua_State *L) {
jbe/bsw@0 1514 const char *result_type;
jbe@23 1515 // only lookup, when key is a string not beginning with an underscore:
jbe/bsw@0 1516 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe@23 1517 return 0;
jbe/bsw@0 1518 }
jbe@384 1519 // value of "_class" attribute or default class on stack position 3:
jbe@23 1520 lua_settop(L, 2);
jbe/bsw@0 1521 lua_getfield(L, 1, "_class"); // 3
jbe/bsw@0 1522 if (!lua_toboolean(L, 3)) {
jbe/bsw@0 1523 lua_settop(L, 2);
jbe/bsw@0 1524 lua_getfield(L,
jbe/bsw@0 1525 LUA_REGISTRYINDEX,
jbe/bsw@0 1526 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1527 ); // 3
jbe/bsw@0 1528 }
jbe@23 1529 // get value of "_type" attribute:
jbe/bsw@0 1530 lua_getfield(L, 1, "_type"); // 4
jbe/bsw@0 1531 result_type = lua_tostring(L, 4);
jbe@23 1532 // different lookup for lists and objects:
jbe@23 1533 if (result_type && !strcmp(result_type, "object")) { // object
jbe/bsw@0 1534 lua_settop(L, 3);
jbe@384 1535 // try inherited attributes, methods or getter functions:
jbe@383 1536 lua_pushvalue(L, 3); // 4
jbe@383 1537 while (lua_toboolean(L, 4)) {
jbe@383 1538 lua_getfield(L, 4, "object"); // 5
jbe@383 1539 lua_pushvalue(L, 2); // 6
jbe@383 1540 lua_gettable(L, 5); // 6
jbe@383 1541 if (!lua_isnil(L, 6)) return 1;
jbe@383 1542 lua_settop(L, 4);
jbe@383 1543 lua_getfield(L, 4, "object_get"); // 5
jbe@383 1544 lua_pushvalue(L, 2); // 6
jbe@383 1545 lua_gettable(L, 5); // 6
jbe@383 1546 if (lua_toboolean(L, 6)) {
jbe@383 1547 lua_pushvalue(L, 1); // 7
jbe@383 1548 lua_call(L, 1, 1); // 6
jbe/bsw@0 1549 return 1;
jbe/bsw@0 1550 }
jbe@383 1551 lua_settop(L, 4);
jbe@383 1552 lua_pushliteral(L, "prototype"); // 5
jbe@383 1553 lua_rawget(L, 4); // 5
jbe@383 1554 lua_replace(L, 4);
jbe/bsw@0 1555 }
jbe@383 1556 lua_settop(L, 3);
jbe/bsw@0 1557 // try primary keys of referenced objects:
jbe/bsw@0 1558 lua_pushcfunction(L,
jbe/bsw@0 1559 mondelefant_class_get_foreign_key_reference_name
jbe@383 1560 ); // 4
jbe@383 1561 lua_pushvalue(L, 3); // 5
jbe@383 1562 lua_pushvalue(L, 2); // 6
jbe@383 1563 lua_call(L, 2, 1); // 4
jbe@383 1564 if (!lua_isnil(L, 4)) {
jbe@383 1565 // reference name at stack position 4
jbe@383 1566 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@382 1567 lua_pushvalue(L, 3); // 6
jbe@383 1568 lua_pushvalue(L, 4); // 7
jbe@383 1569 lua_call(L, 2, 1); // reference info at stack position 5
jbe@383 1570 lua_getfield(L, 1, "_ref"); // 6
jbe@383 1571 lua_getfield(L, 5, "ref"); // 7
jbe@383 1572 lua_gettable(L, 6); // 7
jbe@383 1573 if (!lua_isnil(L, 7)) {
jbe@383 1574 if (lua_toboolean(L, 7)) {
jbe@383 1575 lua_getfield(L, 5, "that_key"); // 8
jbe@383 1576 if (lua_isnil(L, 8)) {
jbe/bsw@0 1577 return luaL_error(L, "Missing 'that_key' entry in model reference.");
jbe/bsw@0 1578 }
jbe@383 1579 lua_gettable(L, 7); // 8
jbe/bsw@0 1580 } else {
jbe/bsw@0 1581 lua_pushnil(L);
jbe/bsw@0 1582 }
jbe/bsw@0 1583 return 1;
jbe/bsw@0 1584 }
jbe/bsw@0 1585 }
jbe@383 1586 lua_settop(L, 3);
jbe@383 1587 lua_getfield(L, 1, "_data"); // _data table on stack position 4
jbe/bsw@0 1588 // try normal data field info:
jbe@383 1589 lua_pushvalue(L, 2); // 5
jbe@383 1590 lua_gettable(L, 4); // 5
jbe@383 1591 if (!lua_isnil(L, 5)) return 1;
jbe@383 1592 lua_settop(L, 4); // keep _data table on stack
jbe/bsw@0 1593 // try cached referenced object (or cached NULL reference):
jbe@383 1594 lua_getfield(L, 1, "_ref"); // 5
jbe@383 1595 lua_pushvalue(L, 2); // 6
jbe@383 1596 lua_gettable(L, 5); // 6
jbe@383 1597 if (lua_isboolean(L, 6) && !lua_toboolean(L, 6)) {
jbe/bsw@0 1598 lua_pushnil(L);
jbe/bsw@0 1599 return 1;
jbe@383 1600 } else if (!lua_isnil(L, 6)) {
jbe/bsw@0 1601 return 1;
jbe/bsw@0 1602 }
jbe@383 1603 lua_settop(L, 4);
jbe/bsw@0 1604 // try to load a referenced object:
jbe@383 1605 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@383 1606 lua_pushvalue(L, 3); // 6
jbe@383 1607 lua_pushvalue(L, 2); // 7
jbe@383 1608 lua_call(L, 2, 1); // 5
jbe@383 1609 if (!lua_isnil(L, 5)) {
jbe/bsw@0 1610 lua_settop(L, 2);
jbe/bsw@0 1611 lua_getfield(L, 1, "load"); // 3
jbe/bsw@0 1612 lua_pushvalue(L, 1); // 4 (self)
jbe/bsw@0 1613 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1614 lua_call(L, 2, 0);
jbe/bsw@0 1615 lua_settop(L, 2);
jbe/bsw@0 1616 lua_getfield(L, 1, "_ref"); // 3
jbe/bsw@0 1617 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1618 lua_gettable(L, 3); // 4
jbe/bsw@0 1619 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) lua_pushnil(L); // TODO: use special object instead of false
jbe/bsw@0 1620 return 1;
jbe/bsw@0 1621 }
jbe@383 1622 lua_settop(L, 4);
jbe@383 1623 // try proxy access to document in special column:
jbe@383 1624 lua_getfield(L, 3, "document_column"); // 5
jbe@383 1625 if (lua_toboolean(L, 5)) {
jbe@383 1626 lua_gettable(L, 4); // 5
jbe@383 1627 if (!lua_isnil(L, 5)) {
jbe@383 1628 lua_pushvalue(L, 2); // 6
jbe@383 1629 lua_gettable(L, 5); // 6
jbe@383 1630 if (!lua_isnil(L, 6)) return 1;
jbe@383 1631 }
jbe@383 1632 }
jbe/bsw@0 1633 return 0;
jbe@23 1634 } else if (result_type && !strcmp(result_type, "list")) { // list
jbe/bsw@0 1635 lua_settop(L, 3);
jbe/bsw@0 1636 // try inherited list attributes or methods:
jbe/bsw@0 1637 while (lua_toboolean(L, 3)) {
jbe/bsw@0 1638 lua_getfield(L, 3, "list"); // 4
jbe/bsw@0 1639 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1640 lua_gettable(L, 4); // 5
jbe/bsw@0 1641 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 1642 lua_settop(L, 3);
jbe/bsw@0 1643 lua_pushliteral(L, "prototype"); // 4
jbe/bsw@0 1644 lua_rawget(L, 3); // 4
jbe/bsw@0 1645 lua_replace(L, 3);
jbe/bsw@0 1646 }
jbe/bsw@0 1647 }
jbe@23 1648 // return nothing:
jbe/bsw@0 1649 return 0;
jbe/bsw@0 1650 }
jbe/bsw@0 1651
jbe@23 1652 // meta-method "__newindex" of database result lists and objects:
jbe/bsw@0 1653 static int mondelefant_result_newindex(lua_State *L) {
jbe/bsw@0 1654 const char *result_type;
jbe@23 1655 // perform rawset, unless key is a string not starting with underscore:
jbe/bsw@0 1656 lua_settop(L, 3);
jbe/bsw@0 1657 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe/bsw@0 1658 lua_rawset(L, 1);
jbe/bsw@0 1659 return 1;
jbe/bsw@0 1660 }
jbe@384 1661 // value of "_class" attribute or default class on stack position 4:
jbe@384 1662 lua_settop(L, 3);
jbe/bsw@0 1663 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0 1664 if (!lua_toboolean(L, 4)) {
jbe/bsw@0 1665 lua_settop(L, 3);
jbe/bsw@0 1666 lua_getfield(L,
jbe/bsw@0 1667 LUA_REGISTRYINDEX,
jbe/bsw@0 1668 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1669 ); // 4
jbe/bsw@0 1670 }
jbe@23 1671 // get value of "_type" attribute:
jbe/bsw@0 1672 lua_getfield(L, 1, "_type"); // 5
jbe/bsw@0 1673 result_type = lua_tostring(L, 5);
jbe@378 1674 // distinguish between lists and objects:
jbe@378 1675 if (result_type && !strcmp(result_type, "object")) { // objects
jbe@378 1676 lua_settop(L, 4);
jbe@378 1677 // try object setter functions:
jbe@384 1678 lua_pushvalue(L, 4); // 5
jbe@384 1679 while (lua_toboolean(L, 5)) {
jbe@384 1680 lua_getfield(L, 5, "object_set"); // 6
jbe@384 1681 lua_pushvalue(L, 2); // 7
jbe@384 1682 lua_gettable(L, 6); // 7
jbe@384 1683 if (lua_toboolean(L, 7)) {
jbe@384 1684 lua_pushvalue(L, 1); // 8
jbe@384 1685 lua_pushvalue(L, 3); // 9
jbe@378 1686 lua_call(L, 2, 0);
jbe@378 1687 return 0;
jbe@378 1688 }
jbe@384 1689 lua_settop(L, 5);
jbe@384 1690 lua_pushliteral(L, "prototype"); // 6
jbe@384 1691 lua_rawget(L, 5); // 6
jbe@384 1692 lua_replace(L, 5);
jbe@378 1693 }
jbe@384 1694 lua_settop(L, 4);
jbe@384 1695 lua_getfield(L, 1, "_data"); // _data table on stack position 5
jbe/bsw@0 1696 // check, if a object reference is changed:
jbe@384 1697 lua_pushcfunction(L, mondelefant_class_get_reference); // 6
jbe@384 1698 lua_pushvalue(L, 4); // 7
jbe@384 1699 lua_pushvalue(L, 2); // 8
jbe@384 1700 lua_call(L, 2, 1); // 6
jbe@384 1701 if (!lua_isnil(L, 6)) {
jbe/bsw@0 1702 // store object in _ref table (use false for nil): // TODO: use special object instead of false
jbe@384 1703 lua_getfield(L, 1, "_ref"); // 7
jbe@384 1704 lua_pushvalue(L, 2); // 8
jbe@384 1705 if (lua_isnil(L, 3)) lua_pushboolean(L, 0); // 9
jbe@384 1706 else lua_pushvalue(L, 3); // 9
jbe@384 1707 lua_settable(L, 7);
jbe@384 1708 lua_settop(L, 6);
jbe/bsw@0 1709 // delete referencing key from _data table:
jbe@384 1710 lua_getfield(L, 6, "this_key"); // 7
jbe@384 1711 if (lua_isnil(L, 7)) {
jbe/bsw@0 1712 return luaL_error(L, "Missing 'this_key' entry in model reference.");
jbe/bsw@0 1713 }
jbe@384 1714 lua_pushvalue(L, 7); // 8
jbe@384 1715 lua_pushnil(L); // 9
jbe@384 1716 lua_settable(L, 5);
jbe@384 1717 lua_getfield(L, 1, "_dirty"); // 8
jbe@384 1718 lua_pushvalue(L, 7); // 9
jbe@384 1719 lua_pushboolean(L, 1); // 10
jbe@384 1720 lua_settable(L, 8);
jbe@384 1721 return 0;
jbe@384 1722 }
jbe@384 1723 lua_settop(L, 5);
jbe@384 1724 // check proxy access to document in special column:
jbe@384 1725 lua_getfield(L, 4, "document_column"); // 6
jbe@384 1726 if (lua_toboolean(L, 6)) {
jbe@384 1727 lua_getfield(L, 1, "_column_info"); // 7
jbe@401 1728 if (!lua_isnil(L, 7)) { // TODO: quick fix to avoid problems on document creation
jbe@384 1729 lua_pushvalue(L, 2); // 8
jbe@384 1730 lua_gettable(L, 7); // 8
jbe@400 1731 if (!lua_toboolean(L, 8)) {
jbe@384 1732 lua_settop(L, 6);
jbe@384 1733 lua_gettable(L, 5); // 6
jbe@384 1734 if (lua_isnil(L, 6)) {
jbe@384 1735 return luaL_error(L, "Cannot write to document column: document is nil");
jbe@384 1736 }
jbe@384 1737 lua_pushvalue(L, 2); // 7
jbe@384 1738 lua_pushvalue(L, 3); // 8
jbe@384 1739 lua_settable(L, 6);
jbe@384 1740 return 0;
jbe@384 1741 }
jbe@401 1742 } // TODO: quick fix to avoid problems on document creation
jbe@384 1743 }
jbe@384 1744 lua_settop(L, 5);
jbe@384 1745 // store value in data field info:
jbe@384 1746 lua_pushvalue(L, 2); // 6
jbe@384 1747 lua_pushvalue(L, 3); // 7
jbe@384 1748 lua_settable(L, 5);
jbe@384 1749 lua_settop(L, 4);
jbe@384 1750 // mark field as dirty (needs to be UPDATEd on save):
jbe@384 1751 lua_getfield(L, 1, "_dirty"); // 5
jbe@384 1752 lua_pushvalue(L, 2); // 6
jbe@384 1753 lua_pushboolean(L, 1); // 7
jbe@384 1754 lua_settable(L, 5);
jbe@384 1755 lua_settop(L, 4);
jbe@384 1756 // reset reference cache, if neccessary:
jbe@384 1757 lua_pushcfunction(L,
jbe@384 1758 mondelefant_class_get_foreign_key_reference_name
jbe@384 1759 ); // 5
jbe@384 1760 lua_pushvalue(L, 4); // 6
jbe@384 1761 lua_pushvalue(L, 2); // 7
jbe@384 1762 lua_call(L, 2, 1); // 5
jbe@384 1763 if (!lua_isnil(L, 5)) {
jbe@384 1764 lua_getfield(L, 1, "_ref"); // 6
jbe@382 1765 lua_pushvalue(L, 5); // 7
jbe@382 1766 lua_pushnil(L); // 8
jbe@382 1767 lua_settable(L, 6);
jbe/bsw@0 1768 }
jbe/bsw@0 1769 return 0;
jbe@23 1770 } else { // non-objects (i.e. lists)
jbe@23 1771 // perform rawset:
jbe/bsw@0 1772 lua_settop(L, 3);
jbe/bsw@0 1773 lua_rawset(L, 1);
jbe/bsw@0 1774 return 0;
jbe/bsw@0 1775 }
jbe/bsw@0 1776 }
jbe/bsw@0 1777
jbe@23 1778 // meta-method "__index" of classes (models):
jbe/bsw@0 1779 static int mondelefant_class_index(lua_State *L) {
jbe@23 1780 // perform lookup in prototype:
jbe/bsw@0 1781 lua_settop(L, 2);
jbe/bsw@0 1782 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1783 lua_rawget(L, 1); // 3
jbe/bsw@0 1784 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1785 lua_gettable(L, 3); // 4
jbe/bsw@0 1786 return 1;
jbe/bsw@0 1787 }
jbe/bsw@0 1788
jbe@23 1789 // registration information for functions of library:
jbe/bsw@0 1790 static const struct luaL_Reg mondelefant_module_functions[] = {
jbe/bsw@0 1791 {"connect", mondelefant_connect},
jbe/bsw@0 1792 {"set_class", mondelefant_set_class},
jbe/bsw@0 1793 {"new_class", mondelefant_new_class},
jbe/bsw@0 1794 {NULL, NULL}
jbe/bsw@0 1795 };
jbe/bsw@0 1796
jbe@23 1797 // registration information for meta-methods of database connections:
jbe/bsw@0 1798 static const struct luaL_Reg mondelefant_conn_mt_functions[] = {
jbe/bsw@0 1799 {"__gc", mondelefant_conn_free},
jbe/bsw@0 1800 {"__index", mondelefant_conn_index},
jbe/bsw@0 1801 {"__newindex", mondelefant_conn_newindex},
jbe/bsw@0 1802 {NULL, NULL}
jbe/bsw@0 1803 };
jbe/bsw@0 1804
jbe@23 1805 // registration information for methods of database connections:
jbe/bsw@0 1806 static const struct luaL_Reg mondelefant_conn_methods[] = {
jbe/bsw@0 1807 {"close", mondelefant_conn_close},
jbe/bsw@0 1808 {"is_ok", mondelefant_conn_is_ok},
jbe/bsw@0 1809 {"get_transaction_status", mondelefant_conn_get_transaction_status},
jbe@397 1810 {"try_wait", mondelefant_conn_try_wait},
jbe@393 1811 {"wait", mondelefant_conn_wait},
jbe/bsw@0 1812 {"create_list", mondelefant_conn_create_list},
jbe/bsw@0 1813 {"create_object", mondelefant_conn_create_object},
jbe/bsw@0 1814 {"quote_string", mondelefant_conn_quote_string},
jbe/bsw@0 1815 {"quote_binary", mondelefant_conn_quote_binary},
jbe/bsw@0 1816 {"assemble_command", mondelefant_conn_assemble_command},
jbe/bsw@0 1817 {"try_query", mondelefant_conn_try_query},
jbe/bsw@0 1818 {"query", mondelefant_conn_query},
jbe/bsw@0 1819 {NULL, NULL}
jbe/bsw@0 1820 };
jbe/bsw@0 1821
jbe@23 1822 // registration information for meta-methods of error objects:
jbe/bsw@0 1823 static const struct luaL_Reg mondelefant_errorobject_mt_functions[] = {
jbe/bsw@0 1824 {NULL, NULL}
jbe/bsw@0 1825 };
jbe/bsw@0 1826
jbe@23 1827 // registration information for methods of error objects:
jbe/bsw@0 1828 static const struct luaL_Reg mondelefant_errorobject_methods[] = {
jbe@397 1829 {"escalate", lua_error},
jbe/bsw@0 1830 {"is_kind_of", mondelefant_errorobject_is_kind_of},
jbe/bsw@0 1831 {NULL, NULL}
jbe/bsw@0 1832 };
jbe/bsw@0 1833
jbe@23 1834 // registration information for meta-methods of database result lists/objects:
jbe/bsw@0 1835 static const struct luaL_Reg mondelefant_result_mt_functions[] = {
jbe/bsw@0 1836 {"__index", mondelefant_result_index},
jbe/bsw@0 1837 {"__newindex", mondelefant_result_newindex},
jbe/bsw@0 1838 {NULL, NULL}
jbe/bsw@0 1839 };
jbe/bsw@0 1840
jbe@23 1841 // registration information for methods of database result lists/objects:
jbe/bsw@0 1842 static const struct luaL_Reg mondelefant_class_mt_functions[] = {
jbe/bsw@0 1843 {"__index", mondelefant_class_index},
jbe/bsw@0 1844 {NULL, NULL}
jbe/bsw@0 1845 };
jbe/bsw@0 1846
jbe@23 1847 // registration information for methods of classes (models):
jbe/bsw@0 1848 static const struct luaL_Reg mondelefant_class_methods[] = {
jbe/bsw@0 1849 {"get_reference", mondelefant_class_get_reference},
jbe/bsw@0 1850 {"iterate_over_references", mondelefant_class_iterate_over_references},
jbe/bsw@0 1851 {"get_foreign_key_reference_name",
jbe/bsw@0 1852 mondelefant_class_get_foreign_key_reference_name},
jbe/bsw@0 1853 {NULL, NULL}
jbe/bsw@0 1854 };
jbe/bsw@0 1855
jbe@23 1856 // registration information for methods of database result objects (not lists!):
jbe/bsw@0 1857 static const struct luaL_Reg mondelefant_object_methods[] = {
jbe/bsw@0 1858 {NULL, NULL}
jbe/bsw@0 1859 };
jbe/bsw@0 1860
jbe@23 1861 // registration information for methods of database result lists (not single objects!):
jbe/bsw@0 1862 static const struct luaL_Reg mondelefant_list_methods[] = {
jbe/bsw@0 1863 {NULL, NULL}
jbe/bsw@0 1864 };
jbe/bsw@0 1865
jbe@23 1866 // luaopen function to initialize/register library:
jbe/bsw@0 1867 int luaopen_mondelefant_native(lua_State *L) {
jbe/bsw@0 1868 lua_settop(L, 0);
jbe/bsw@0 1869 lua_newtable(L); // module at stack position 1
jbe@64 1870 luaL_setfuncs(L, mondelefant_module_functions, 0);
jbe/bsw@0 1871
jbe/bsw@0 1872 lua_pushvalue(L, 1); // 2
jbe/bsw@0 1873 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe/bsw@0 1874
jbe/bsw@0 1875 lua_newtable(L); // 2
jbe/bsw@0 1876 // NOTE: only PostgreSQL is supported yet:
jbe@64 1877 luaL_setfuncs(L, mondelefant_conn_methods, 0);
jbe/bsw@0 1878 lua_setfield(L, 1, "postgresql_connection_prototype");
jbe/bsw@0 1879 lua_newtable(L); // 2
jbe/bsw@0 1880 lua_setfield(L, 1, "connection_prototype");
jbe/bsw@0 1881
jbe/bsw@0 1882 luaL_newmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe@64 1883 luaL_setfuncs(L, mondelefant_conn_mt_functions, 0);
jbe/bsw@0 1884 lua_settop(L, 1);
jbe/bsw@0 1885 luaL_newmetatable(L, MONDELEFANT_RESULT_MT_REGKEY); // 2
jbe@64 1886 luaL_setfuncs(L, mondelefant_result_mt_functions, 0);
jbe/bsw@0 1887 lua_setfield(L, 1, "result_metatable");
jbe/bsw@0 1888 luaL_newmetatable(L, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe@64 1889 luaL_setfuncs(L, mondelefant_class_mt_functions, 0);
jbe/bsw@0 1890 lua_setfield(L, 1, "class_metatable");
jbe/bsw@0 1891
jbe/bsw@0 1892 lua_newtable(L); // 2
jbe@272 1893 luaL_setfuncs(L, mondelefant_class_methods, 0);
jbe/bsw@0 1894 lua_newtable(L); // 3
jbe@64 1895 luaL_setfuncs(L, mondelefant_object_methods, 0);
jbe/bsw@0 1896 lua_setfield(L, 2, "object");
jbe/bsw@0 1897 lua_newtable(L); // 3
jbe/bsw@0 1898 lua_setfield(L, 2, "object_get");
jbe/bsw@0 1899 lua_newtable(L); // 3
jbe/bsw@0 1900 lua_setfield(L, 2, "object_set");
jbe/bsw@0 1901 lua_newtable(L); // 3
jbe@64 1902 luaL_setfuncs(L, mondelefant_list_methods, 0);
jbe/bsw@0 1903 lua_setfield(L, 2, "list");
jbe/bsw@0 1904 lua_newtable(L); // 3
jbe/bsw@0 1905 lua_setfield(L, 2, "references");
jbe/bsw@0 1906 lua_newtable(L); // 3
jbe/bsw@0 1907 lua_setfield(L, 2, "foreign_keys");
jbe/bsw@0 1908 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1909 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY);
jbe/bsw@0 1910 lua_setfield(L, 1, "class_prototype");
jbe/bsw@0 1911
jbe/bsw@0 1912 luaL_newmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY); // 2
jbe@64 1913 luaL_setfuncs(L, mondelefant_errorobject_mt_functions, 0);
jbe/bsw@0 1914 lua_newtable(L); // 3
jbe@64 1915 luaL_setfuncs(L, mondelefant_errorobject_methods, 0);
jbe/bsw@0 1916 lua_setfield(L, 2, "__index");
jbe/bsw@0 1917 lua_setfield(L, 1, "errorobject_metatable");
jbe/bsw@0 1918
jbe/bsw@0 1919 return 1;
jbe/bsw@0 1920 }

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