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annotate libraries/mondelefant/mondelefant_native.c @ 402:04172238d79b

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Do not require "engine" field to be set for mondelefant.connect{...}; Fixed bugs in mondelefant.connect{...} that could have crashed Lua; Shortened Lua registry key for mondelefant library
author jbe
date Wed Jan 06 02:39:50 2016 +0100 (2016-01-06)
parents ad437022be90
children 36f0d1d5ed7d
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 PGconn *pgconn; // PGconn object as returned by PQconnectdb function
jbe@23 199 mondelefant_conn_t *conn; // C-structure for userdata
jbe@402 200 // check if string is given as first argument:
jbe@402 201 if (lua_type(L, 1) != LUA_TSTRING) {
jbe@402 202 // expect a table as first argument if no string is given:
jbe@402 203 luaL_checktype(L, 1, LUA_TTABLE);
jbe@402 204 // copy conninfo string for PQconnectdb function from argument table to
jbe@402 205 // stack position 2:
jbe@40 206 lua_settop(L, 1);
jbe@402 207 lua_getfield(L, 1, "conninfo"); // 2
jbe@402 208 // check if conninfo is set:
jbe@402 209 if (!lua_isnil(L, 2)) {
jbe@402 210 // if yes, use that value but check its type:
jbe@402 211 luaL_argcheck(L, lua_type(L, 2) == LUA_TSTRING, 2, "\"conninfo\" value is not a string");
jbe@402 212 } else {
jbe@402 213 // otherwise assemble conninfo string from the named options:
jbe@402 214 luaL_Buffer buf;
jbe@40 215 int need_seperator = 0;
jbe@402 216 const char *value;
jbe@402 217 size_t value_len;
jbe@402 218 size_t value_pos = 0;
jbe@402 219 lua_settop(L, 1);
jbe@402 220 lua_pushnil(L); // slot for key at stack position 2
jbe@402 221 lua_pushnil(L); // slot for value at stack position 3
jbe@402 222 luaL_buffinit(L, &buf);
jbe@40 223 while (lua_pushvalue(L, 2), lua_next(L, 1)) {
jbe@402 224 luaL_argcheck(L, lua_isstring(L, -2), 1, "key in table is not a string");
jbe@402 225 luaL_argcheck(L, lua_isstring(L, -1), 1, "value in table is not a string");
jbe@402 226 value = lua_tolstring(L, -1, &value_len);
jbe@40 227 lua_replace(L, 3);
jbe@402 228 lua_pop(L, 1);
jbe@40 229 lua_replace(L, 2);
jbe@402 230 if (need_seperator) luaL_addchar(&buf, ' ');
jbe@40 231 // NOTE: numbers will be converted to strings automatically here,
jbe@40 232 // but perhaps this will change in future versions of lua
jbe@40 233 lua_pushvalue(L, 2);
jbe@402 234 luaL_addvalue(&buf);
jbe@402 235 luaL_addchar(&buf, '=');
jbe@402 236 luaL_addchar(&buf, '\'');
jbe@402 237 do {
jbe@402 238 char c;
jbe@402 239 c = value[value_pos++];
jbe@402 240 if (c == '\'') luaL_addchar(&buf, '\\');
jbe@402 241 luaL_addchar(&buf, c);
jbe@402 242 } while (value_pos < value_len);
jbe@402 243 luaL_addchar(&buf, '\'');
jbe@402 244 need_seperator = 1;
jbe/bsw@0 245 }
jbe@402 246 luaL_pushresult(&buf);
jbe/bsw@0 247 }
jbe@402 248 // ensure that string is on stack position 1 which is the top of stack:
jbe@402 249 lua_replace(L, 1);
jbe@402 250 lua_settop(L, 1);
jbe/bsw@0 251 }
jbe@402 252 // use conninfo string on stack position 1:
jbe@402 253 conninfo = lua_tostring(L, 1);
jbe@23 254 // call PQconnectdb function of libpq:
jbe/bsw@0 255 pgconn = PQconnectdb(conninfo);
jbe@397 256 // throw or return errors, if neccessary:
jbe/bsw@0 257 if (!pgconn) {
jbe/bsw@0 258 return luaL_error(L,
jbe/bsw@0 259 "Error in libpq while creating 'PGconn' structure."
jbe/bsw@0 260 );
jbe/bsw@0 261 }
jbe/bsw@0 262 if (PQstatus(pgconn) != CONNECTION_OK) {
jbe@402 263 lua_pushnil(L); // 2
jbe@402 264 mondelefant_push_first_line(L, PQerrorMessage(pgconn)); // 3
jbe@402 265 lua_newtable(L); // 4
jbe@397 266 lua_getfield(L,
jbe@397 267 LUA_REGISTRYINDEX,
jbe@397 268 MONDELEFANT_ERROROBJECT_MT_REGKEY
jbe@397 269 );
jbe@402 270 lua_setmetatable(L, 4);
jbe/bsw@0 271 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@402 272 lua_setfield(L, 4, "code");
jbe@402 273 lua_pushvalue(L, 3);
jbe@402 274 lua_setfield(L, 4, "message");
jbe/bsw@0 275 PQfinish(pgconn);
jbe/bsw@0 276 return 3;
jbe/bsw@0 277 }
jbe@23 278 // create userdata:
jbe/bsw@0 279 lua_settop(L, 0);
jbe/bsw@0 280 conn = lua_newuserdata(L, sizeof(*conn)); // 1
jbe@23 281 // set 'pgconn' in C-struct of userdata:
jbe/bsw@0 282 conn->pgconn = pgconn;
jbe@23 283 // set 'server_encoding' in C-struct of userdata:
jbe/bsw@0 284 {
jbe/bsw@0 285 const char *charset;
jbe/bsw@0 286 charset = PQparameterStatus(pgconn, "server_encoding");
jbe/bsw@0 287 if (charset && !strcmp(charset, "UTF8")) {
jbe/bsw@0 288 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_UTF8;
jbe/bsw@0 289 } else {
jbe/bsw@0 290 conn->server_encoding = MONDELEFANT_SERVER_ENCODING_ASCII;
jbe/bsw@0 291 }
jbe/bsw@0 292 }
jbe@23 293 // set meta-table of userdata:
jbe/bsw@0 294 luaL_getmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe/bsw@0 295 lua_setmetatable(L, 1);
jbe@396 296 // create and associate userdata table:
jbe@396 297 lua_newtable(L);
jbe@396 298 lua_setuservalue(L, 1);
jbe@396 299 // store key "fd" with file descriptor of connection:
jbe@396 300 lua_pushinteger(L, PQsocket(pgconn));
jbe@396 301 lua_setfield(L, 1, "fd");
jbe@23 302 // store key "engine" with value "postgresql" as connection specific data:
jbe/bsw@0 303 lua_pushliteral(L, "postgresql");
jbe/bsw@0 304 lua_setfield(L, 1, "engine");
jbe@23 305 // return userdata:
jbe/bsw@0 306 return 1;
jbe/bsw@0 307 }
jbe/bsw@0 308
jbe@23 309 // returns pointer to libpq handle 'pgconn' of userdata at given index
jbe@23 310 // (or throws error, if database connection has been closed):
jbe/bsw@0 311 static mondelefant_conn_t *mondelefant_get_conn(lua_State *L, int index) {
jbe/bsw@0 312 mondelefant_conn_t *conn;
jbe/bsw@0 313 conn = luaL_checkudata(L, index, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 314 if (!conn->pgconn) {
jbe/bsw@0 315 luaL_error(L, "PostgreSQL connection has been closed.");
jbe/bsw@0 316 return NULL;
jbe/bsw@0 317 }
jbe/bsw@0 318 return conn;
jbe/bsw@0 319 }
jbe/bsw@0 320
jbe@23 321 // meta-method "__index" of database handles (userdata):
jbe/bsw@0 322 static int mondelefant_conn_index(lua_State *L) {
jbe@23 323 // try table for connection specific data:
jbe/bsw@0 324 lua_settop(L, 2);
jbe@396 325 lua_getuservalue(L, 1); // 3
jbe/bsw@0 326 lua_pushvalue(L, 2); // 4
jbe/bsw@0 327 lua_gettable(L, 3); // 4
jbe/bsw@0 328 if (!lua_isnil(L, 4)) return 1;
jbe@23 329 // try to use prototype stored in connection specific data:
jbe/bsw@0 330 lua_settop(L, 3);
jbe/bsw@0 331 lua_getfield(L, 3, "prototype"); // 4
jbe/bsw@0 332 if (lua_toboolean(L, 4)) {
jbe/bsw@0 333 lua_pushvalue(L, 2); // 5
jbe/bsw@0 334 lua_gettable(L, 4); // 5
jbe/bsw@0 335 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 336 }
jbe@23 337 // try to use "postgresql_connection_prototype" of library:
jbe/bsw@0 338 lua_settop(L, 2);
jbe/bsw@0 339 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY); // 3
jbe/bsw@0 340 lua_getfield(L, 3, "postgresql_connection_prototype"); // 4
jbe/bsw@0 341 if (lua_toboolean(L, 4)) {
jbe/bsw@0 342 lua_pushvalue(L, 2); // 5
jbe/bsw@0 343 lua_gettable(L, 4); // 5
jbe/bsw@0 344 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 345 }
jbe@23 346 // try to use "connection_prototype" of library:
jbe/bsw@0 347 lua_settop(L, 3);
jbe/bsw@0 348 lua_getfield(L, 3, "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 // give up and return nothing:
jbe/bsw@0 355 return 0;
jbe/bsw@0 356 }
jbe/bsw@0 357
jbe@23 358 // meta-method "__newindex" of database handles (userdata):
jbe/bsw@0 359 static int mondelefant_conn_newindex(lua_State *L) {
jbe@23 360 // store key-value pair in table for connection specific data:
jbe/bsw@0 361 lua_settop(L, 3);
jbe@396 362 lua_getuservalue(L, 1); // 4
jbe/bsw@0 363 lua_pushvalue(L, 2);
jbe/bsw@0 364 lua_pushvalue(L, 3);
jbe/bsw@0 365 lua_settable(L, 4);
jbe@23 366 // return nothing:
jbe/bsw@0 367 return 0;
jbe/bsw@0 368 }
jbe/bsw@0 369
jbe@23 370 // meta-method "__gc" of database handles:
jbe/bsw@0 371 static int mondelefant_conn_free(lua_State *L) {
jbe/bsw@0 372 mondelefant_conn_t *conn;
jbe/bsw@0 373 conn = luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe/bsw@0 374 if (conn->pgconn) PQfinish(conn->pgconn);
jbe/bsw@0 375 conn->pgconn = NULL;
jbe/bsw@0 376 return 0;
jbe/bsw@0 377 }
jbe/bsw@0 378
jbe@23 379 // method "close" of database handles:
jbe/bsw@0 380 static int mondelefant_conn_close(lua_State *L) {
jbe/bsw@0 381 mondelefant_conn_t *conn;
jbe/bsw@0 382 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 383 PQfinish(conn->pgconn);
jbe/bsw@0 384 conn->pgconn = NULL;
jbe@397 385 lua_pushnil(L);
jbe@396 386 lua_setfield(L, 1, "fd"); // set "fd" attribute to nil
jbe/bsw@0 387 return 0;
jbe/bsw@0 388 }
jbe/bsw@0 389
jbe@23 390 // method "is_okay" of database handles:
jbe/bsw@0 391 static int mondelefant_conn_is_ok(lua_State *L) {
jbe/bsw@0 392 mondelefant_conn_t *conn;
jbe/bsw@0 393 conn = mondelefant_get_conn(L, 1);
jbe/bsw@0 394 lua_pushboolean(L, PQstatus(conn->pgconn) == CONNECTION_OK);
jbe/bsw@0 395 return 1;
jbe/bsw@0 396 }
jbe/bsw@0 397
jbe@23 398 // method "get_transaction_status" of database handles:
jbe/bsw@0 399 static int mondelefant_conn_get_transaction_status(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 switch (PQtransactionStatus(conn->pgconn)) {
jbe/bsw@0 403 case PQTRANS_IDLE:
jbe/bsw@0 404 lua_pushliteral(L, "idle");
jbe/bsw@0 405 break;
jbe/bsw@0 406 case PQTRANS_ACTIVE:
jbe/bsw@0 407 lua_pushliteral(L, "active");
jbe/bsw@0 408 break;
jbe/bsw@0 409 case PQTRANS_INTRANS:
jbe/bsw@0 410 lua_pushliteral(L, "intrans");
jbe/bsw@0 411 break;
jbe/bsw@0 412 case PQTRANS_INERROR:
jbe/bsw@0 413 lua_pushliteral(L, "inerror");
jbe/bsw@0 414 break;
jbe/bsw@0 415 default:
jbe/bsw@0 416 lua_pushliteral(L, "unknown");
jbe/bsw@0 417 }
jbe/bsw@0 418 return 1;
jbe/bsw@0 419 }
jbe/bsw@0 420
jbe@397 421 // method "try_wait" of database handles:
jbe@397 422 static int mondelefant_conn_try_wait(lua_State *L) {
jbe@393 423 mondelefant_conn_t *conn;
jbe@393 424 int infinite, nonblock = 0;
jbe@393 425 struct timespec wakeup;
jbe@393 426 int fd;
jbe@393 427 fd_set fds;
jbe@393 428 conn = mondelefant_get_conn(L, 1);
jbe@393 429 infinite = lua_isnoneornil(L, 2);
jbe@393 430 if (!infinite) {
jbe@393 431 lua_Number n;
jbe@393 432 int isnum;
jbe@393 433 n = lua_tonumberx(L, 2, &isnum);
jbe@393 434 if (isnum && n>0 && n<=86400*366) {
jbe@393 435 if (clock_gettime(CLOCK_MONOTONIC, &wakeup)) {
jbe@393 436 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 437 }
jbe@393 438 wakeup.tv_sec += n;
jbe@393 439 wakeup.tv_nsec += 1000000000 * (n - (time_t)n);
jbe@393 440 if (wakeup.tv_nsec >= 1000000000) {
jbe@393 441 wakeup.tv_sec += 1;
jbe@393 442 wakeup.tv_nsec -= 1000000000;
jbe@393 443 }
jbe@393 444 } else if (isnum && n==0) {
jbe@393 445 nonblock = 1;
jbe@393 446 } else {
jbe@393 447 luaL_argcheck(L, 0, 2, "not a valid timeout");
jbe@393 448 }
jbe@393 449 }
jbe@397 450 lua_settop(L, 1);
jbe@393 451 if (!nonblock) {
jbe@393 452 fd = PQsocket(conn->pgconn);
jbe@393 453 FD_ZERO(&fds);
jbe@393 454 FD_SET(fd, &fds);
jbe@393 455 }
jbe@393 456 while (true) {
jbe@393 457 {
jbe@393 458 PGnotify *notify;
jbe@393 459 if (!PQconsumeInput(conn->pgconn)) {
jbe@397 460 lua_newtable(L); // 2
jbe@397 461 lua_getfield(L,
jbe@397 462 LUA_REGISTRYINDEX,
jbe@397 463 MONDELEFANT_ERROROBJECT_MT_REGKEY
jbe@397 464 );
jbe@397 465 lua_setmetatable(L, 2);
jbe@397 466 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe@397 467 lua_setfield(L, 2, "code");
jbe@397 468 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn)); // 3
jbe@397 469 lua_setfield(L, 2, "message");
jbe@397 470 return 1;
jbe@393 471 }
jbe@393 472 notify = PQnotifies(conn->pgconn);
jbe@393 473 if (notify) {
jbe@397 474 lua_pushnil(L);
jbe@393 475 lua_pushstring(L, notify->relname);
jbe@393 476 lua_pushstring(L, notify->extra);
jbe@393 477 lua_pushinteger(L, notify->be_pid);
jbe@393 478 PQfreemem(notify);
jbe@397 479 return 4;
jbe@393 480 }
jbe@393 481 }
jbe@393 482 if (infinite) {
jbe@393 483 select(fd+1, &fds, NULL, NULL, NULL);
jbe@393 484 } else if (nonblock) {
jbe@393 485 break;
jbe@393 486 } else {
jbe@393 487 struct timespec tp;
jbe@393 488 struct timeval timeout = { 0, };
jbe@393 489 if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
jbe@393 490 return luaL_error(L, "Could not access CLOCK_MONOTONIC");
jbe@393 491 }
jbe@393 492 tp.tv_sec = wakeup.tv_sec - tp.tv_sec;
jbe@393 493 tp.tv_nsec = wakeup.tv_nsec - tp.tv_nsec;
jbe@393 494 if (tp.tv_nsec < 0) {
jbe@393 495 tp.tv_sec -= 1;
jbe@393 496 tp.tv_nsec += 1000000000;
jbe@393 497 }
jbe@393 498 timeout.tv_sec = tp.tv_sec;
jbe@393 499 timeout.tv_usec = (tp.tv_nsec + 500) / 1000;
jbe@393 500 if (
jbe@393 501 timeout.tv_sec < 0 ||
jbe@393 502 (timeout.tv_sec == 0 && timeout.tv_usec == 0)
jbe@393 503 ) break;
jbe@393 504 select(fd+1, &fds, NULL, NULL, &timeout);
jbe@393 505 }
jbe@393 506 }
jbe@397 507 lua_pushnil(L);
jbe@397 508 lua_pushnil(L);
jbe@393 509 return 2;
jbe@393 510 }
jbe@393 511
jbe@23 512 // method "create_list" of database handles:
jbe/bsw@0 513 static int mondelefant_conn_create_list(lua_State *L) {
jbe@23 514 // ensure that first argument is a database connection:
jbe/bsw@0 515 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 516 // if no second argument is given, use an empty table:
jbe@397 517 if (lua_isnoneornil(L, 2)) {
jbe@397 518 lua_settop(L, 1);
jbe@397 519 lua_newtable(L); // 2
jbe@397 520 } else {
jbe@397 521 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 522 lua_settop(L, 2);
jbe/bsw@0 523 }
jbe@23 524 // set meta-table for database result lists/objects:
jbe/bsw@0 525 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
jbe/bsw@0 526 lua_setmetatable(L, 2);
jbe@23 527 // set "_connection" attribute to self:
jbe/bsw@0 528 lua_pushvalue(L, 1); // 3
jbe/bsw@0 529 lua_setfield(L, 2, "_connection");
jbe@23 530 // set "_type" attribute to string "list":
jbe/bsw@0 531 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 532 lua_setfield(L, 2, "_type");
jbe@23 533 // return created database result list:
jbe/bsw@0 534 return 1;
jbe/bsw@0 535 }
jbe/bsw@0 536
jbe@23 537 // method "create_object" of database handles:
jbe/bsw@0 538 static int mondelefant_conn_create_object(lua_State *L) {
jbe@23 539 // ensure that first argument is a database connection:
jbe/bsw@0 540 luaL_checkudata(L, 1, MONDELEFANT_CONN_MT_REGKEY);
jbe@23 541 // if no second argument is given, use an empty table:
jbe@397 542 if (lua_isnoneornil(L, 2)) {
jbe@397 543 lua_settop(L, 1);
jbe@397 544 lua_newtable(L); // 2
jbe@397 545 } else {
jbe@397 546 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 547 lua_settop(L, 2);
jbe/bsw@0 548 }
jbe@397 549 // set meta-table for database result lists/objects:
jbe/bsw@0 550 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 3
jbe/bsw@0 551 lua_setmetatable(L, 2);
jbe@23 552 // set "_connection" attribute to self:
jbe/bsw@0 553 lua_pushvalue(L, 1); // 3
jbe/bsw@0 554 lua_setfield(L, 2, "_connection");
jbe@23 555 // set "_type" attribute to string "object":
jbe/bsw@0 556 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 557 lua_setfield(L, 2, "_type"); // "object" or "list"
jbe@23 558 // create empty tables for "_data", "_dirty" and "_ref" attributes:
jbe/bsw@0 559 lua_newtable(L); // 3
jbe/bsw@0 560 lua_setfield(L, 2, "_data");
jbe/bsw@0 561 lua_newtable(L); // 3
jbe/bsw@0 562 lua_setfield(L, 2, "_dirty");
jbe/bsw@0 563 lua_newtable(L); // 3
jbe/bsw@0 564 lua_setfield(L, 2, "_ref"); // nil=no info, false=nil, else table
jbe@23 565 // return created database result object:
jbe/bsw@0 566 return 1;
jbe/bsw@0 567 }
jbe/bsw@0 568
jbe@23 569 // method "quote_string" of database handles:
jbe/bsw@0 570 static int mondelefant_conn_quote_string(lua_State *L) {
jbe/bsw@0 571 mondelefant_conn_t *conn;
jbe/bsw@0 572 const char *input;
jbe/bsw@0 573 size_t input_len;
jbe/bsw@0 574 char *output;
jbe/bsw@0 575 size_t output_len;
jbe@23 576 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 577 conn = mondelefant_get_conn(L, 1);
jbe@23 578 // get second argument, which must be a string:
jbe/bsw@0 579 input = luaL_checklstring(L, 2, &input_len);
jbe@23 580 // throw error, if string is too long:
jbe/bsw@0 581 if (input_len > (SIZE_MAX / sizeof(char) - 3) / 2) {
jbe/bsw@0 582 return luaL_error(L, "String to be escaped is too long.");
jbe/bsw@0 583 }
jbe@23 584 // allocate memory for quoted string:
jbe/bsw@0 585 output = malloc((2 * input_len + 3) * sizeof(char));
jbe/bsw@0 586 if (!output) {
jbe/bsw@0 587 return luaL_error(L, "Could not allocate memory for string quoting.");
jbe/bsw@0 588 }
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/bsw@0 598 lua_pushlstring(L, output, output_len + 2);
jbe@23 599 // free allocated memory:
jbe/bsw@0 600 free(output);
jbe@23 601 // return Lua string:
jbe/bsw@0 602 return 1;
jbe/bsw@0 603 }
jbe/bsw@0 604
jbe@23 605 // method "quote_binary" of database handles:
jbe/bsw@0 606 static int mondelefant_conn_quote_binary(lua_State *L) {
jbe/bsw@0 607 mondelefant_conn_t *conn;
jbe/bsw@0 608 const char *input;
jbe/bsw@0 609 size_t input_len;
jbe/bsw@0 610 char *output;
jbe/bsw@0 611 size_t output_len;
jbe/bsw@0 612 luaL_Buffer buf;
jbe@23 613 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 614 conn = mondelefant_get_conn(L, 1);
jbe@23 615 // get second argument, which must be a string:
jbe/bsw@0 616 input = luaL_checklstring(L, 2, &input_len);
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@23 621 // if PQescapeByteaConn returned NULL, then throw error:
jbe/bsw@0 622 if (!output) {
jbe/bsw@0 623 return luaL_error(L, "Could not allocate memory for binary quoting.");
jbe/bsw@0 624 }
jbe@23 625 // create Lua string enclosed by single quotes:
jbe/bsw@0 626 luaL_buffinit(L, &buf);
jbe/bsw@0 627 luaL_addchar(&buf, '\'');
jbe/bsw@0 628 luaL_addlstring(&buf, output, output_len - 1);
jbe/bsw@0 629 luaL_addchar(&buf, '\'');
jbe/bsw@0 630 luaL_pushresult(&buf);
jbe@23 631 // free memory allocated by PQescapeByteaConn:
jbe/bsw@0 632 PQfreemem(output);
jbe@23 633 // return Lua string:
jbe/bsw@0 634 return 1;
jbe/bsw@0 635 }
jbe/bsw@0 636
jbe@23 637 // method "assemble_command" of database handles:
jbe/bsw@0 638 static int mondelefant_conn_assemble_command(lua_State *L) {
jbe/bsw@0 639 mondelefant_conn_t *conn;
jbe/bsw@0 640 int paramidx = 2;
jbe/bsw@0 641 const char *template;
jbe/bsw@0 642 size_t template_pos = 0;
jbe/bsw@0 643 luaL_Buffer buf;
jbe@23 644 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 645 conn = mondelefant_get_conn(L, 1);
jbe@23 646 // if second argument is a string, return this string:
jbe@397 647 if (lua_type(L, 2) == LUA_TSTRING) {
jbe@397 648 lua_settop(L, 2);
jbe/bsw@0 649 return 1;
jbe/bsw@0 650 }
jbe@23 651 // if second argument has __tostring meta-method,
jbe@23 652 // then use this method and return its result:
jbe/bsw@0 653 if (luaL_callmeta(L, 2, "__tostring")) return 1;
jbe@23 654 // otherwise, require that second argument is a table:
jbe/bsw@0 655 luaL_checktype(L, 2, LUA_TTABLE);
jbe@397 656 // set stack top:
jbe@397 657 lua_settop(L, 2);
jbe@23 658 // get first element of table, which must be a string:
jbe/bsw@0 659 lua_rawgeti(L, 2, 1); // 3
jbe/bsw@0 660 luaL_argcheck(L,
jbe/bsw@0 661 lua_isstring(L, 3),
jbe/bsw@0 662 2,
jbe/bsw@0 663 "First entry of SQL command structure is not a string."
jbe/bsw@0 664 );
jbe/bsw@0 665 template = lua_tostring(L, 3);
jbe@23 666 // get value of "input_converter" attribute of database connection:
jbe/bsw@0 667 lua_pushliteral(L, "input_converter"); // 4
jbe/bsw@0 668 lua_gettable(L, 1); // input_converter at stack position 4
jbe@23 669 // reserve space on Lua stack:
jbe/bsw@0 670 lua_pushnil(L); // free space at stack position 5
jbe/bsw@0 671 lua_pushnil(L); // free space at stack position 6
jbe@23 672 // initialize Lua buffer for result string:
jbe/bsw@0 673 luaL_buffinit(L, &buf);
jbe@23 674 // fill buffer in loop:
jbe/bsw@0 675 while (1) {
jbe@23 676 // variable declaration:
jbe/bsw@0 677 char c;
jbe@23 678 // get next character:
jbe/bsw@0 679 c = template[template_pos++];
jbe@23 680 // break, when character is NULL byte:
jbe/bsw@0 681 if (!c) break;
jbe@23 682 // question-mark and dollar-sign are special characters:
jbe@23 683 if (c == '?' || c == '$') { // special character found
jbe@23 684 // check, if same character follows:
jbe@23 685 if (template[template_pos] == c) { // special character is escaped
jbe@23 686 // consume two characters of input and add one character to buffer:
jbe/bsw@0 687 template_pos++;
jbe/bsw@0 688 luaL_addchar(&buf, c);
jbe@23 689 } else { // special character is not escaped
jbe/bsw@0 690 luaL_Buffer keybuf;
jbe/bsw@0 691 int subcmd;
jbe@23 692 // set 'subcmd' = true, if special character was a dollar-sign,
jbe@23 693 // set 'subcmd' = false, if special character was a question-mark:
jbe/bsw@0 694 subcmd = (c == '$');
jbe@23 695 // read any number of alpha numeric chars or underscores
jbe@23 696 // and store them on Lua stack:
jbe/bsw@0 697 luaL_buffinit(L, &keybuf);
jbe/bsw@0 698 while (1) {
jbe/bsw@0 699 c = template[template_pos];
jbe/bsw@0 700 if (
jbe/bsw@0 701 (c < 'A' || c > 'Z') &&
jbe/bsw@0 702 (c < 'a' || c > 'z') &&
jbe/bsw@0 703 (c < '0' || c > '9') &&
jbe/bsw@0 704 (c != '_')
jbe/bsw@0 705 ) break;
jbe/bsw@0 706 luaL_addchar(&keybuf, c);
jbe/bsw@0 707 template_pos++;
jbe/bsw@0 708 }
jbe/bsw@0 709 luaL_pushresult(&keybuf);
jbe@23 710 // check, if any characters matched:
jbe@64 711 if (lua_rawlen(L, -1)) {
jbe@23 712 // if any alpha numeric chars or underscores were found,
jbe@23 713 // push them on stack as a Lua string and use them to lookup
jbe@23 714 // value from second argument:
jbe/bsw@0 715 lua_pushvalue(L, -1); // save key on stack
jbe@23 716 lua_gettable(L, 2); // fetch value (raw-value)
jbe/bsw@0 717 } else {
jbe@23 718 // otherwise push nil and use numeric lookup based on 'paramidx':
jbe/bsw@0 719 lua_pop(L, 1);
jbe/bsw@0 720 lua_pushnil(L); // put nil on key position
jbe@23 721 lua_rawgeti(L, 2, paramidx++); // fetch value (raw-value)
jbe/bsw@0 722 }
jbe@23 723 // Lua stack contains: ..., <buffer>, key, raw-value
jbe@23 724 // branch according to type of special character ("?" or "$"):
jbe@23 725 if (subcmd) { // dollar-sign
jbe/bsw@0 726 size_t i;
jbe/bsw@0 727 size_t count;
jbe@23 728 // store fetched value (which is supposed to be sub-structure)
jbe@23 729 // on Lua stack position 5 and drop key:
jbe@23 730 lua_replace(L, 5);
jbe@23 731 lua_pop(L, 1);
jbe@23 732 // Lua stack contains: ..., <buffer>
jbe@23 733 // check, if fetched value is really a sub-structure:
jbe/bsw@0 734 luaL_argcheck(L,
jbe/bsw@0 735 !lua_isnil(L, 5),
jbe/bsw@0 736 2,
jbe/bsw@0 737 "SQL sub-structure not found."
jbe/bsw@0 738 );
jbe/bsw@0 739 luaL_argcheck(L,
jbe/bsw@0 740 lua_type(L, 5) == LUA_TTABLE,
jbe/bsw@0 741 2,
jbe/bsw@0 742 "SQL sub-structure must be a table."
jbe/bsw@0 743 );
jbe@23 744 // Lua stack contains: ..., <buffer>
jbe@23 745 // get value of "sep" attribute of sub-structure,
jbe@23 746 // and place it on Lua stack position 6:
jbe/bsw@0 747 lua_getfield(L, 5, "sep");
jbe@23 748 lua_replace(L, 6);
jbe@23 749 // if seperator is nil, then use ", " as default,
jbe@23 750 // if seperator is neither nil nor a string, then throw error:
jbe/bsw@0 751 if (lua_isnil(L, 6)) {
jbe/bsw@0 752 lua_pushstring(L, ", ");
jbe/bsw@0 753 lua_replace(L, 6);
jbe/bsw@0 754 } else {
jbe/bsw@0 755 luaL_argcheck(L,
jbe/bsw@0 756 lua_isstring(L, 6),
jbe/bsw@0 757 2,
jbe/bsw@0 758 "Seperator of SQL sub-structure has to be a string."
jbe/bsw@0 759 );
jbe/bsw@0 760 }
jbe@23 761 // iterate over items of sub-structure:
jbe@64 762 count = lua_rawlen(L, 5);
jbe/bsw@0 763 for (i = 0; i < count; i++) {
jbe@23 764 // add seperator, unless this is the first run:
jbe/bsw@0 765 if (i) {
jbe/bsw@0 766 lua_pushvalue(L, 6);
jbe/bsw@0 767 luaL_addvalue(&buf);
jbe/bsw@0 768 }
jbe@23 769 // recursivly apply assemble function and add results to buffer:
jbe/bsw@0 770 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 771 lua_pushvalue(L, 1);
jbe/bsw@0 772 lua_rawgeti(L, 5, i+1);
jbe/bsw@0 773 lua_call(L, 2, 1);
jbe/bsw@0 774 luaL_addvalue(&buf);
jbe/bsw@0 775 }
jbe@23 776 } else { // question-mark
jbe/bsw@0 777 if (lua_toboolean(L, 4)) {
jbe@23 778 // call input_converter with connection handle, raw-value and
jbe@23 779 // an info-table which contains a "field_name" entry with the
jbe@23 780 // used key:
jbe/bsw@0 781 lua_pushvalue(L, 4);
jbe/bsw@0 782 lua_pushvalue(L, 1);
jbe/bsw@0 783 lua_pushvalue(L, -3);
jbe/bsw@0 784 lua_newtable(L);
jbe/bsw@0 785 lua_pushvalue(L, -6);
jbe/bsw@0 786 lua_setfield(L, -2, "field_name");
jbe/bsw@0 787 lua_call(L, 3, 1);
jbe@23 788 // Lua stack contains: ..., <buffer>, key, raw-value, final-value
jbe@23 789 // remove key and raw-value:
jbe/bsw@0 790 lua_remove(L, -2);
jbe/bsw@0 791 lua_remove(L, -2);
jbe@23 792 // Lua stack contains: ..., <buffer>, final-value
jbe@23 793 // throw error, if final-value is not a string:
jbe/bsw@0 794 if (!lua_isstring(L, -1)) {
jbe/bsw@0 795 return luaL_error(L, "input_converter returned non-string.");
jbe/bsw@0 796 }
jbe/bsw@0 797 } else {
jbe@23 798 // remove key from stack:
jbe/bsw@0 799 lua_remove(L, -2);
jbe@23 800 // Lua stack contains: ..., <buffer>, raw-value
jbe@23 801 // branch according to type of value:
jbe@23 802 if (lua_isnil(L, -1)) { // value is nil
jbe@23 803 // push string "NULL" to stack:
jbe/bsw@0 804 lua_pushliteral(L, "NULL");
jbe@23 805 } else if (lua_type(L, -1) == LUA_TBOOLEAN) { // value is boolean
jbe@23 806 // push strings "TRUE" or "FALSE" to stack:
jbe/bsw@0 807 lua_pushstring(L, lua_toboolean(L, -1) ? "TRUE" : "FALSE");
jbe@23 808 } else if (lua_isstring(L, -1)) { // value is string or number
jbe/bsw@0 809 // NOTE: In this version of lua a number will be converted
jbe@23 810 // push output of "quote_string" method of database
jbe@23 811 // connection to stack:
jbe/bsw@0 812 lua_tostring(L, -1);
jbe/bsw@0 813 lua_pushcfunction(L, mondelefant_conn_quote_string);
jbe/bsw@0 814 lua_pushvalue(L, 1);
jbe/bsw@0 815 lua_pushvalue(L, -3);
jbe/bsw@0 816 lua_call(L, 2, 1);
jbe@23 817 } else { // value is of other type
jbe@23 818 // throw error:
jbe/bsw@0 819 return luaL_error(L,
jbe/bsw@0 820 "Unable to convert SQL value due to unknown type "
jbe/bsw@0 821 "or missing input_converter."
jbe/bsw@0 822 );
jbe/bsw@0 823 }
jbe@23 824 // Lua stack contains: ..., <buffer>, raw-value, final-value
jbe@23 825 // remove raw-value:
jbe/bsw@0 826 lua_remove(L, -2);
jbe@23 827 // Lua stack contains: ..., <buffer>, final-value
jbe/bsw@0 828 }
jbe@23 829 // append final-value to buffer:
jbe/bsw@0 830 luaL_addvalue(&buf);
jbe/bsw@0 831 }
jbe/bsw@0 832 }
jbe@23 833 } else { // character is not special
jbe@23 834 // just copy character:
jbe/bsw@0 835 luaL_addchar(&buf, c);
jbe/bsw@0 836 }
jbe/bsw@0 837 }
jbe@23 838 // return string in buffer:
jbe/bsw@0 839 luaL_pushresult(&buf);
jbe/bsw@0 840 return 1;
jbe/bsw@0 841 }
jbe/bsw@0 842
jbe@23 843 // max number of SQL statements executed by one "query" method call:
jbe/bsw@0 844 #define MONDELEFANT_MAX_COMMAND_COUNT 64
jbe@23 845 // max number of columns in a database result:
jbe/bsw@0 846 #define MONDELEFANT_MAX_COLUMN_COUNT 1024
jbe@23 847 // enum values for 'modes' array in C-function below:
jbe/bsw@0 848 #define MONDELEFANT_QUERY_MODE_LIST 1
jbe/bsw@0 849 #define MONDELEFANT_QUERY_MODE_OBJECT 2
jbe/bsw@0 850 #define MONDELEFANT_QUERY_MODE_OPT_OBJECT 3
jbe/bsw@0 851
jbe@23 852 // method "try_query" of database handles:
jbe/bsw@0 853 static int mondelefant_conn_try_query(lua_State *L) {
jbe/bsw@0 854 mondelefant_conn_t *conn;
jbe/bsw@0 855 int command_count;
jbe/bsw@0 856 int command_idx;
jbe/bsw@0 857 int modes[MONDELEFANT_MAX_COMMAND_COUNT];
jbe/bsw@0 858 luaL_Buffer buf;
jbe/bsw@0 859 int sent_success;
jbe/bsw@0 860 PGresult *res;
jbe/bsw@0 861 int rows, cols, row, col;
jbe@23 862 // get 'conn' attribute of C-struct of database connection:
jbe/bsw@0 863 conn = mondelefant_get_conn(L, 1);
jbe@23 864 // calculate number of commands (2 arguments for one command):
jbe/bsw@0 865 command_count = lua_gettop(L) / 2;
jbe@23 866 // push nil on stack, which is needed, if last mode was ommitted:
jbe@23 867 lua_pushnil(L);
jbe@23 868 // throw error, if number of commands is too high:
jbe/bsw@0 869 if (command_count > MONDELEFANT_MAX_COMMAND_COUNT) {
jbe/bsw@0 870 return luaL_error(L, "Exceeded maximum command count in one query.");
jbe/bsw@0 871 }
jbe@23 872 // create SQL string, store query modes and push SQL string on stack:
jbe/bsw@0 873 luaL_buffinit(L, &buf);
jbe/bsw@0 874 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 875 int mode;
jbe/bsw@0 876 int mode_idx; // stack index of mode string
jbe/bsw@0 877 if (command_idx) luaL_addchar(&buf, ' ');
jbe/bsw@0 878 lua_pushcfunction(L, mondelefant_conn_assemble_command);
jbe/bsw@0 879 lua_pushvalue(L, 1);
jbe/bsw@0 880 lua_pushvalue(L, 2 + 2 * command_idx);
jbe/bsw@0 881 lua_call(L, 2, 1);
jbe/bsw@0 882 luaL_addvalue(&buf);
jbe/bsw@0 883 luaL_addchar(&buf, ';');
jbe/bsw@0 884 mode_idx = 3 + 2 * command_idx;
jbe/bsw@0 885 if (lua_isnil(L, mode_idx)) {
jbe/bsw@0 886 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 887 } else {
jbe/bsw@0 888 const char *modestr;
jbe/bsw@0 889 modestr = luaL_checkstring(L, mode_idx);
jbe/bsw@0 890 if (!strcmp(modestr, "list")) {
jbe/bsw@0 891 mode = MONDELEFANT_QUERY_MODE_LIST;
jbe/bsw@0 892 } else if (!strcmp(modestr, "object")) {
jbe/bsw@0 893 mode = MONDELEFANT_QUERY_MODE_OBJECT;
jbe/bsw@0 894 } else if (!strcmp(modestr, "opt_object")) {
jbe/bsw@0 895 mode = MONDELEFANT_QUERY_MODE_OPT_OBJECT;
jbe/bsw@0 896 } else {
jbe@397 897 return luaL_argerror(L, mode_idx, "unknown query mode");
jbe/bsw@0 898 }
jbe/bsw@0 899 }
jbe/bsw@0 900 modes[command_idx] = mode;
jbe/bsw@0 901 }
jbe/bsw@0 902 luaL_pushresult(&buf); // stack position unknown
jbe/bsw@0 903 lua_replace(L, 2); // SQL command string to stack position 2
jbe@23 904 // call sql_tracer, if set:
jbe/bsw@0 905 lua_settop(L, 2);
jbe/bsw@0 906 lua_getfield(L, 1, "sql_tracer"); // tracer at stack position 3
jbe/bsw@0 907 if (lua_toboolean(L, 3)) {
jbe/bsw@0 908 lua_pushvalue(L, 1); // 4
jbe/bsw@0 909 lua_pushvalue(L, 2); // 5
jbe/bsw@0 910 lua_call(L, 2, 1); // trace callback at stack position 3
jbe/bsw@0 911 }
jbe@23 912 // NOTE: If no tracer was found, then nil or false is stored at stack
jbe@23 913 // position 3.
jbe@23 914 // call PQsendQuery function and store result in 'sent_success' variable:
jbe/bsw@0 915 sent_success = PQsendQuery(conn->pgconn, lua_tostring(L, 2));
jbe@23 916 // create preliminary result table:
jbe/bsw@0 917 lua_newtable(L); // results in table at stack position 4
jbe@23 918 // iterate over results using function PQgetResult to fill result table:
jbe/bsw@0 919 for (command_idx = 0; ; command_idx++) {
jbe/bsw@0 920 int mode;
jbe/bsw@0 921 char binary[MONDELEFANT_MAX_COLUMN_COUNT];
jbe/bsw@0 922 ExecStatusType pgstatus;
jbe@23 923 // fetch mode which was given for the command:
jbe/bsw@0 924 mode = modes[command_idx];
jbe@23 925 // if PQsendQuery call was successful, then fetch result data:
jbe/bsw@0 926 if (sent_success) {
jbe@23 927 // NOTE: PQgetResult called one extra time. Break only, if all
jbe@23 928 // queries have been processed and PQgetResult returned NULL.
jbe/bsw@0 929 res = PQgetResult(conn->pgconn);
jbe/bsw@0 930 if (command_idx >= command_count && !res) break;
jbe/bsw@0 931 if (res) {
jbe/bsw@0 932 pgstatus = PQresultStatus(res);
jbe/bsw@0 933 rows = PQntuples(res);
jbe/bsw@0 934 cols = PQnfields(res);
jbe/bsw@0 935 }
jbe/bsw@0 936 }
jbe@23 937 // handle errors:
jbe/bsw@0 938 if (
jbe/bsw@0 939 !sent_success || command_idx >= command_count || !res ||
jbe/bsw@0 940 (pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK) ||
jbe/bsw@0 941 (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) ||
jbe/bsw@0 942 (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST)
jbe/bsw@0 943 ) {
jbe/bsw@0 944 const char *command;
jbe/bsw@0 945 command = lua_tostring(L, 2);
jbe/bsw@0 946 lua_newtable(L); // 5
jbe/bsw@0 947 lua_getfield(L,
jbe/bsw@0 948 LUA_REGISTRYINDEX,
jbe/bsw@0 949 MONDELEFANT_ERROROBJECT_MT_REGKEY
jbe/bsw@0 950 );
jbe/bsw@0 951 lua_setmetatable(L, 5);
jbe/bsw@0 952 lua_pushvalue(L, 1);
jbe/bsw@0 953 lua_setfield(L, 5, "connection");
jbe/bsw@0 954 lua_pushvalue(L, 2);
jbe/bsw@0 955 lua_setfield(L, 5, "sql_command");
jbe@397 956 if (!sent_success) {
jbe@397 957 lua_pushliteral(L, MONDELEFANT_ERRCODE_CONNECTION);
jbe/bsw@0 958 lua_setfield(L, 5, "code");
jbe@397 959 mondelefant_push_first_line(L, PQerrorMessage(conn->pgconn));
jbe/bsw@0 960 lua_setfield(L, 5, "message");
jbe/bsw@0 961 } else {
jbe@397 962 lua_pushinteger(L, command_idx + 1);
jbe@397 963 lua_setfield(L, 5, "command_number");
jbe@397 964 if (!res) {
jbe@397 965 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_LOW);
jbe@397 966 lua_setfield(L, 5, "code");
jbe@397 967 lua_pushliteral(L, "Received too few database result sets.");
jbe@397 968 lua_setfield(L, 5, "message");
jbe@397 969 } else if (command_idx >= command_count) {
jbe@397 970 lua_pushliteral(L, MONDELEFANT_ERRCODE_RESULTCOUNT_HIGH);
jbe@397 971 lua_setfield(L, 5, "code");
jbe@397 972 lua_pushliteral(L, "Received too many database result sets.");
jbe@397 973 lua_setfield(L, 5, "message");
jbe@397 974 } else if (
jbe@397 975 pgstatus != PGRES_TUPLES_OK && pgstatus != PGRES_COMMAND_OK
jbe@397 976 ) {
jbe@397 977 const char *sqlstate;
jbe@397 978 const char *errmsg;
jbe@397 979 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SEVERITY));
jbe@397 980 lua_setfield(L, 5, "pg_severity");
jbe@397 981 sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
jbe@397 982 if (sqlstate) {
jbe@397 983 lua_pushstring(L, sqlstate);
jbe@397 984 lua_setfield(L, 5, "pg_sqlstate");
jbe@397 985 lua_pushstring(L, mondelefant_translate_errcode(sqlstate));
jbe@397 986 lua_setfield(L, 5, "code");
jbe@397 987 } else {
jbe@397 988 lua_pushliteral(L, MONDELEFANT_ERRCODE_UNKNOWN);
jbe@397 989 lua_setfield(L, 5, "code");
jbe@397 990 }
jbe@397 991 errmsg = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
jbe@397 992 if (errmsg) {
jbe@397 993 mondelefant_push_first_line(L, errmsg);
jbe@397 994 lua_setfield(L, 5, "message");
jbe@397 995 lua_pushstring(L, errmsg);
jbe@397 996 lua_setfield(L, 5, "pg_message_primary");
jbe@397 997 } else {
jbe@397 998 lua_pushliteral(L,
jbe@397 999 "Error while fetching result, but no error message given."
jbe@397 1000 );
jbe@397 1001 lua_setfield(L, 5, "message");
jbe@397 1002 }
jbe@397 1003 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL));
jbe@397 1004 lua_setfield(L, 5, "pg_message_detail");
jbe@397 1005 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_MESSAGE_HINT));
jbe@397 1006 lua_setfield(L, 5, "pg_message_hint");
jbe@397 1007 // NOTE: "position" and "pg_internal_position" are recalculated to
jbe@397 1008 // byte offsets, as Lua 5.2 is not Unicode aware.
jbe@397 1009 {
jbe@397 1010 char *tmp;
jbe@397 1011 tmp = PQresultErrorField(res, PG_DIAG_STATEMENT_POSITION);
jbe@397 1012 if (tmp) {
jbe@397 1013 int pos;
jbe@397 1014 pos = atoi(tmp) - 1;
jbe@397 1015 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1016 pos = utf8_position_to_byte(command, pos);
jbe@397 1017 }
jbe@397 1018 lua_pushinteger(L, pos + 1);
jbe@397 1019 lua_setfield(L, 5, "position");
jbe@397 1020 }
jbe@397 1021 }
jbe@397 1022 {
jbe@397 1023 const char *internal_query;
jbe@397 1024 internal_query = PQresultErrorField(res, PG_DIAG_INTERNAL_QUERY);
jbe@397 1025 lua_pushstring(L, internal_query);
jbe@397 1026 lua_setfield(L, 5, "pg_internal_query");
jbe@397 1027 char *tmp;
jbe@397 1028 tmp = PQresultErrorField(res, PG_DIAG_INTERNAL_POSITION);
jbe@397 1029 if (tmp) {
jbe@397 1030 int pos;
jbe@397 1031 pos = atoi(tmp) - 1;
jbe@397 1032 if (conn->server_encoding == MONDELEFANT_SERVER_ENCODING_UTF8) {
jbe@397 1033 pos = utf8_position_to_byte(internal_query, pos);
jbe@397 1034 }
jbe@397 1035 lua_pushinteger(L, pos + 1);
jbe@397 1036 lua_setfield(L, 5, "pg_internal_position");
jbe@397 1037 }
jbe@397 1038 }
jbe@397 1039 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_CONTEXT));
jbe@397 1040 lua_setfield(L, 5, "pg_context");
jbe@397 1041 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FILE));
jbe@397 1042 lua_setfield(L, 5, "pg_source_file");
jbe@397 1043 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_LINE));
jbe@397 1044 lua_setfield(L, 5, "pg_source_line");
jbe@397 1045 lua_pushstring(L, PQresultErrorField(res, PG_DIAG_SOURCE_FUNCTION));
jbe@397 1046 lua_setfield(L, 5, "pg_source_function");
jbe@397 1047 } else if (rows < 1 && mode == MONDELEFANT_QUERY_MODE_OBJECT) {
jbe@397 1048 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_NO_ROWS);
jbe@397 1049 lua_setfield(L, 5, "code");
jbe@397 1050 lua_pushliteral(L, "Expected one row, but got empty set.");
jbe@397 1051 lua_setfield(L, 5, "message");
jbe@397 1052 } else if (rows > 1 && mode != MONDELEFANT_QUERY_MODE_LIST) {
jbe@397 1053 lua_pushliteral(L, MONDELEFANT_ERRCODE_QUERY1_MULTIPLE_ROWS);
jbe@397 1054 lua_setfield(L, 5, "code");
jbe@397 1055 lua_pushliteral(L, "Got more than one result row.");
jbe@397 1056 lua_setfield(L, 5, "message");
jbe@397 1057 } else {
jbe@397 1058 // should not happen
jbe@397 1059 abort();
jbe@397 1060 }
jbe@397 1061 if (res) {
jbe@397 1062 PQclear(res);
jbe@397 1063 while ((res = PQgetResult(conn->pgconn))) PQclear(res);
jbe@397 1064 }
jbe/bsw@0 1065 }
jbe/bsw@0 1066 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1067 lua_pushvalue(L, 3);
jbe/bsw@0 1068 lua_pushvalue(L, 5);
jbe/bsw@0 1069 lua_call(L, 1, 0);
jbe/bsw@0 1070 }
jbe/bsw@0 1071 return 1;
jbe/bsw@0 1072 }
jbe@23 1073 // call "create_list" or "create_object" method of database handle,
jbe@23 1074 // result will be at stack position 5:
jbe/bsw@0 1075 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1076 lua_pushcfunction(L, mondelefant_conn_create_list); // 5
jbe/bsw@0 1077 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1078 lua_call(L, 1, 1); // 5
jbe/bsw@0 1079 } else {
jbe/bsw@0 1080 lua_pushcfunction(L, mondelefant_conn_create_object); // 5
jbe/bsw@0 1081 lua_pushvalue(L, 1); // 6
jbe/bsw@0 1082 lua_call(L, 1, 1); // 5
jbe/bsw@0 1083 }
jbe@23 1084 // set "_column_info":
jbe@23 1085 lua_newtable(L); // 6
jbe/bsw@0 1086 for (col = 0; col < cols; col++) {
jbe/bsw@0 1087 lua_newtable(L); // 7
jbe@380 1088 lua_pushstring(L, PQfname(res, col)); // 8
jbe@380 1089 lua_pushvalue(L, 8); // 9
jbe@380 1090 lua_pushvalue(L, 7); // 10
jbe@380 1091 lua_rawset(L, 6);
jbe/bsw@0 1092 lua_setfield(L, 7, "field_name");
jbe@380 1093 // _column_info entry (for current column) on stack position 7
jbe/bsw@0 1094 {
jbe/bsw@0 1095 Oid tmp;
jbe/bsw@0 1096 tmp = PQftable(res, col);
jbe/bsw@0 1097 if (tmp == InvalidOid) lua_pushnil(L);
jbe/bsw@0 1098 else lua_pushinteger(L, tmp);
jbe/bsw@0 1099 lua_setfield(L, 7, "table_oid");
jbe/bsw@0 1100 }
jbe/bsw@0 1101 {
jbe/bsw@0 1102 int tmp;
jbe/bsw@0 1103 tmp = PQftablecol(res, col);
jbe/bsw@0 1104 if (tmp == 0) lua_pushnil(L);
jbe/bsw@0 1105 else lua_pushinteger(L, tmp);
jbe/bsw@0 1106 lua_setfield(L, 7, "table_column_number");
jbe/bsw@0 1107 }
jbe/bsw@0 1108 {
jbe/bsw@0 1109 Oid tmp;
jbe/bsw@0 1110 tmp = PQftype(res, col);
jbe/bsw@0 1111 binary[col] = (tmp == MONDELEFANT_POSTGRESQL_BINARY_OID);
jbe/bsw@0 1112 lua_pushinteger(L, tmp);
jbe/bsw@0 1113 lua_setfield(L, 7, "type_oid");
jbe/bsw@0 1114 lua_pushstring(L, mondelefant_oid_to_typestr(tmp));
jbe/bsw@0 1115 lua_setfield(L, 7, "type");
jbe/bsw@0 1116 }
jbe/bsw@0 1117 {
jbe/bsw@0 1118 int tmp;
jbe/bsw@0 1119 tmp = PQfmod(res, col);
jbe/bsw@0 1120 if (tmp == -1) lua_pushnil(L);
jbe/bsw@0 1121 else lua_pushinteger(L, tmp);
jbe/bsw@0 1122 lua_setfield(L, 7, "type_modifier");
jbe/bsw@0 1123 }
jbe/bsw@0 1124 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1125 }
jbe@23 1126 lua_setfield(L, 5, "_column_info");
jbe@23 1127 // set "_rows_affected":
jbe/bsw@0 1128 {
jbe/bsw@0 1129 char *tmp;
jbe/bsw@0 1130 tmp = PQcmdTuples(res);
jbe/bsw@0 1131 if (tmp[0]) {
jbe/bsw@0 1132 lua_pushinteger(L, atoi(tmp));
jbe/bsw@0 1133 lua_setfield(L, 5, "_rows_affected");
jbe/bsw@0 1134 }
jbe/bsw@0 1135 }
jbe@23 1136 // set "_oid":
jbe/bsw@0 1137 {
jbe/bsw@0 1138 Oid tmp;
jbe/bsw@0 1139 tmp = PQoidValue(res);
jbe/bsw@0 1140 if (tmp != InvalidOid) {
jbe/bsw@0 1141 lua_pushinteger(L, tmp);
jbe/bsw@0 1142 lua_setfield(L, 5, "_oid");
jbe/bsw@0 1143 }
jbe/bsw@0 1144 }
jbe@23 1145 // copy data as strings or nil, while performing binary unescaping
jbe@23 1146 // automatically:
jbe/bsw@0 1147 if (modes[command_idx] == MONDELEFANT_QUERY_MODE_LIST) {
jbe/bsw@0 1148 for (row = 0; row < rows; row++) {
jbe/bsw@0 1149 lua_pushcfunction(L, mondelefant_conn_create_object); // 6
jbe/bsw@0 1150 lua_pushvalue(L, 1); // 7
jbe/bsw@0 1151 lua_call(L, 1, 1); // 6
jbe/bsw@0 1152 for (col = 0; col < cols; col++) {
jbe/bsw@0 1153 if (PQgetisnull(res, row, col)) {
jbe/bsw@0 1154 lua_pushnil(L);
jbe/bsw@0 1155 } else if (binary[col]) {
jbe/bsw@0 1156 size_t binlen;
jbe/bsw@0 1157 char *binval;
jbe/bsw@0 1158 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1159 (unsigned char *)PQgetvalue(res, row, col), &binlen
jbe/bsw@0 1160 );
jbe/bsw@0 1161 if (!binval) {
jbe/bsw@0 1162 return luaL_error(L,
jbe/bsw@0 1163 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1164 );
jbe/bsw@0 1165 }
jbe/bsw@0 1166 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1167 PQfreemem(binval);
jbe/bsw@0 1168 } else {
jbe/bsw@0 1169 lua_pushstring(L, PQgetvalue(res, row, col));
jbe/bsw@0 1170 }
jbe/bsw@0 1171 lua_rawseti(L, 6, col+1);
jbe/bsw@0 1172 }
jbe/bsw@0 1173 lua_rawseti(L, 5, row+1);
jbe/bsw@0 1174 }
jbe/bsw@0 1175 } else if (rows == 1) {
jbe/bsw@0 1176 for (col = 0; col < cols; col++) {
jbe/bsw@0 1177 if (PQgetisnull(res, 0, col)) {
jbe/bsw@0 1178 lua_pushnil(L);
jbe/bsw@0 1179 } else if (binary[col]) {
jbe/bsw@0 1180 size_t binlen;
jbe/bsw@0 1181 char *binval;
jbe/bsw@0 1182 binval = (char *)PQunescapeBytea(
jbe/bsw@0 1183 (unsigned char *)PQgetvalue(res, 0, col), &binlen
jbe/bsw@0 1184 );
jbe/bsw@0 1185 if (!binval) {
jbe/bsw@0 1186 return luaL_error(L,
jbe/bsw@0 1187 "Could not allocate memory for binary unescaping."
jbe/bsw@0 1188 );
jbe/bsw@0 1189 }
jbe/bsw@0 1190 lua_pushlstring(L, binval, binlen);
jbe/bsw@0 1191 PQfreemem(binval);
jbe/bsw@0 1192 } else {
jbe/bsw@0 1193 lua_pushstring(L, PQgetvalue(res, 0, col));
jbe/bsw@0 1194 }
jbe/bsw@0 1195 lua_rawseti(L, 5, col+1);
jbe/bsw@0 1196 }
jbe/bsw@0 1197 } else {
jbe/bsw@0 1198 // no row in optrow mode
jbe/bsw@0 1199 lua_pop(L, 1);
jbe/bsw@0 1200 lua_pushnil(L);
jbe/bsw@0 1201 }
jbe@23 1202 // save result in result list:
jbe/bsw@0 1203 lua_rawseti(L, 4, command_idx+1);
jbe@23 1204 // extra assertion:
jbe/bsw@0 1205 if (lua_gettop(L) != 4) abort(); // should not happen
jbe@23 1206 // free memory acquired by libpq:
jbe/bsw@0 1207 PQclear(res);
jbe/bsw@0 1208 }
jbe/bsw@0 1209 // trace callback at stack position 3
jbe/bsw@0 1210 // result at stack position 4 (top of stack)
jbe@23 1211 // if a trace callback is existent, then call:
jbe/bsw@0 1212 if (lua_toboolean(L, 3)) {
jbe/bsw@0 1213 lua_pushvalue(L, 3);
jbe/bsw@0 1214 lua_call(L, 0, 0);
jbe/bsw@0 1215 }
jbe@23 1216 // put result at stack position 3:
jbe@23 1217 lua_replace(L, 3);
jbe@23 1218 // get output converter to stack position 4:
jbe@23 1219 lua_getfield(L, 1, "output_converter");
jbe@374 1220 // get mutability state saver to stack position 5:
jbe@375 1221 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe@375 1222 lua_getfield(L, -1, "save_mutability_state");
jbe@375 1223 lua_replace(L, -2);
jbe@23 1224 // apply output converters and fill "_data" table according to column names:
jbe/bsw@0 1225 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1226 int mode;
jbe/bsw@0 1227 mode = modes[command_idx];
jbe@374 1228 lua_rawgeti(L, 3, command_idx+1); // raw result at stack position 6
jbe@374 1229 if (lua_toboolean(L, 6)) {
jbe@374 1230 lua_getfield(L, 6, "_column_info"); // column_info list at position 7
jbe@374 1231 cols = lua_rawlen(L, 7);
jbe/bsw@0 1232 if (mode == MONDELEFANT_QUERY_MODE_LIST) {
jbe@374 1233 rows = lua_rawlen(L, 6);
jbe/bsw@0 1234 for (row = 0; row < rows; row++) {
jbe@374 1235 lua_rawgeti(L, 6, row+1); // row at stack position 8
jbe@374 1236 lua_getfield(L, 8, "_data"); // _data table at stack position 9
jbe@375 1237 lua_getfield(L, 8, "_dirty"); // _dirty table at stack position 10
jbe/bsw@0 1238 for (col = 0; col < cols; col++) {
jbe@375 1239 lua_rawgeti(L, 7, col+1); // this column info at position 11
jbe@375 1240 lua_getfield(L, 11, "field_name"); // 12
jbe/bsw@0 1241 if (lua_toboolean(L, 4)) {
jbe/bsw@0 1242 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0 1243 lua_pushvalue(L, 1); // connection
jbe@374 1244 lua_rawgeti(L, 8, col+1); // raw-value
jbe@375 1245 lua_pushvalue(L, 11); // this column info
jbe@375 1246 lua_call(L, 3, 1); // converted value at position 13
jbe/bsw@0 1247 } else {
jbe@375 1248 lua_rawgeti(L, 8, col+1); // raw-value at position 13
jbe/bsw@0 1249 }
jbe@375 1250 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375 1251 lua_pushvalue(L, 12); // copy of field name
jbe@375 1252 lua_pushvalue(L, 5); // mutability state saver function
jbe@375 1253 lua_pushvalue(L, 13); // copy of value
jbe@375 1254 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375 1255 lua_rawset(L, 10); // store mutability state in _dirty table
jbe@375 1256 }
jbe@375 1257 lua_pushvalue(L, 13); // 14
jbe@374 1258 lua_rawseti(L, 8, col+1);
jbe@374 1259 lua_rawset(L, 9);
jbe@399 1260 lua_settop(L, 10);
jbe/bsw@0 1261 }
jbe@374 1262 lua_settop(L, 7);
jbe/bsw@0 1263 }
jbe/bsw@0 1264 } else {
jbe@374 1265 lua_getfield(L, 6, "_data"); // _data table at stack position 8
jbe@375 1266 lua_getfield(L, 6, "_dirty"); // _dirty table at stack position 9
jbe/bsw@0 1267 for (col = 0; col < cols; col++) {
jbe@375 1268 lua_rawgeti(L, 7, col+1); // this column info at position 10
jbe@375 1269 lua_getfield(L, 10, "field_name"); // 11
jbe/bsw@0 1270 if (lua_toboolean(L, 4)) {
jbe/bsw@0 1271 lua_pushvalue(L, 4); // output-converter
jbe/bsw@0 1272 lua_pushvalue(L, 1); // connection
jbe@374 1273 lua_rawgeti(L, 6, col+1); // raw-value
jbe@375 1274 lua_pushvalue(L, 10); // this column info
jbe@375 1275 lua_call(L, 3, 1); // converted value at position 12
jbe/bsw@0 1276 } else {
jbe@375 1277 lua_rawgeti(L, 6, col+1); // raw-value at position 12
jbe/bsw@0 1278 }
jbe@375 1279 if (lua_toboolean(L, 5)) { // handle mutable values?
jbe@375 1280 lua_pushvalue(L, 11); // copy of field name
jbe@375 1281 lua_pushvalue(L, 5); // mutability state saver function
jbe@375 1282 lua_pushvalue(L, 12); // copy of value
jbe@375 1283 lua_call(L, 1, 1); // calculated mutability state of value
jbe@375 1284 lua_rawset(L, 9); // store mutability state in _dirty table
jbe@375 1285 }
jbe@375 1286 lua_pushvalue(L, 12); // 13
jbe@374 1287 lua_rawseti(L, 6, col+1);
jbe@374 1288 lua_rawset(L, 8);
jbe@399 1289 lua_settop(L, 9);
jbe/bsw@0 1290 }
jbe/bsw@0 1291 }
jbe/bsw@0 1292 }
jbe@374 1293 lua_settop(L, 5);
jbe/bsw@0 1294 }
jbe@23 1295 // return nil as first result value, followed by result lists/objects:
jbe/bsw@0 1296 lua_settop(L, 3);
jbe/bsw@0 1297 lua_pushnil(L);
jbe/bsw@0 1298 for (command_idx = 0; command_idx < command_count; command_idx++) {
jbe/bsw@0 1299 lua_rawgeti(L, 3, command_idx+1);
jbe/bsw@0 1300 }
jbe/bsw@0 1301 return command_count+1;
jbe/bsw@0 1302 }
jbe/bsw@0 1303
jbe@397 1304 // method "is_kind_of" of error objects:
jbe@397 1305 static int mondelefant_errorobject_is_kind_of(lua_State *L) {
jbe@397 1306 const char *errclass;
jbe@397 1307 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397 1308 errclass = luaL_checkstring(L, 2);
jbe@397 1309 lua_settop(L, 2);
jbe@397 1310 lua_getfield(L, 1, "code"); // 3
jbe@397 1311 luaL_argcheck(L,
jbe@397 1312 lua_type(L, 3) == LUA_TSTRING,
jbe@397 1313 1,
jbe@397 1314 "field 'code' of error object is not a string"
jbe@397 1315 );
jbe@397 1316 lua_pushboolean(L,
jbe@397 1317 mondelefant_check_error_class(lua_tostring(L, 3), errclass)
jbe@397 1318 );
jbe@397 1319 return 1;
jbe@397 1320 }
jbe@397 1321
jbe@397 1322 // method "wait" of database handles:
jbe@397 1323 static int mondelefant_conn_wait(lua_State *L) {
jbe@397 1324 int argc;
jbe@397 1325 // count number of arguments:
jbe@397 1326 argc = lua_gettop(L);
jbe@397 1327 // insert "try_wait" function/method at stack position 1:
jbe@397 1328 lua_pushcfunction(L, mondelefant_conn_try_wait);
jbe@397 1329 lua_insert(L, 1);
jbe@397 1330 // call "try_wait" method:
jbe@397 1331 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@397 1332 // check, if error occurred:
jbe@397 1333 if (lua_toboolean(L, 1)) {
jbe@397 1334 // raise error
jbe/bsw@0 1335 lua_settop(L, 1);
jbe/bsw@0 1336 return lua_error(L);
jbe/bsw@0 1337 } else {
jbe@397 1338 // return everything but nil error object:
jbe@397 1339 return lua_gettop(L) - 1;
jbe/bsw@0 1340 }
jbe/bsw@0 1341 }
jbe/bsw@0 1342
jbe@23 1343 // method "query" of database handles:
jbe/bsw@0 1344 static int mondelefant_conn_query(lua_State *L) {
jbe/bsw@0 1345 int argc;
jbe@23 1346 // count number of arguments:
jbe/bsw@0 1347 argc = lua_gettop(L);
jbe@23 1348 // insert "try_query" function/method at stack position 1:
jbe/bsw@0 1349 lua_pushcfunction(L, mondelefant_conn_try_query);
jbe@23 1350 lua_insert(L, 1);
jbe@23 1351 // call "try_query" method:
jbe@23 1352 lua_call(L, argc, LUA_MULTRET); // results (with error) starting at index 1
jbe@23 1353 // check, if error occurred:
jbe@23 1354 if (lua_toboolean(L, 1)) {
jbe@397 1355 // raise error
jbe@397 1356 lua_settop(L, 1);
jbe@397 1357 return lua_error(L);
jbe/bsw@0 1358 } else {
jbe@23 1359 // return everything but nil error object:
jbe@23 1360 return lua_gettop(L) - 1;
jbe/bsw@0 1361 }
jbe/bsw@0 1362 }
jbe/bsw@0 1363
jbe@23 1364 // library function "set_class":
jbe/bsw@0 1365 static int mondelefant_set_class(lua_State *L) {
jbe@23 1366 // ensure that first argument is a database result list/object:
jbe/bsw@0 1367 lua_settop(L, 2);
jbe/bsw@0 1368 lua_getmetatable(L, 1); // 3
jbe/bsw@0 1369 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_RESULT_MT_REGKEY); // 4
jbe@64 1370 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 1, "not a database result");
jbe@23 1371 // ensure that second argument is a database class (model):
jbe/bsw@0 1372 lua_settop(L, 2);
jbe/bsw@0 1373 lua_getmetatable(L, 2); // 3
jbe/bsw@0 1374 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 4
jbe@64 1375 luaL_argcheck(L, lua_compare(L, 3, 4, LUA_OPEQ), 2, "not a database class");
jbe@23 1376 // set attribute "_class" of result list/object to given class:
jbe/bsw@0 1377 lua_settop(L, 2);
jbe/bsw@0 1378 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1379 lua_setfield(L, 1, "_class");
jbe@23 1380 // test, if database result is a list (and not a single object):
jbe/bsw@0 1381 lua_getfield(L, 1, "_type"); // 3
jbe/bsw@0 1382 lua_pushliteral(L, "list"); // 4
jbe/bsw@0 1383 if (lua_rawequal(L, 3, 4)) {
jbe/bsw@0 1384 int i;
jbe@23 1385 // set attribute "_class" of all elements to given class:
jbe@64 1386 for (i=0; i < lua_rawlen(L, 1); i++) {
jbe/bsw@0 1387 lua_settop(L, 2);
jbe/bsw@0 1388 lua_rawgeti(L, 1, i+1); // 3
jbe/bsw@0 1389 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1390 lua_setfield(L, 3, "_class");
jbe/bsw@0 1391 }
jbe/bsw@0 1392 }
jbe@23 1393 // return first argument:
jbe/bsw@0 1394 lua_settop(L, 1);
jbe/bsw@0 1395 return 1;
jbe/bsw@0 1396 }
jbe/bsw@0 1397
jbe@23 1398 // library function "new_class":
jbe/bsw@0 1399 static int mondelefant_new_class(lua_State *L) {
jbe@397 1400 // if no argument is given, use an empty table:
jbe@397 1401 if (lua_isnoneornil(L, 1)) {
jbe/bsw@0 1402 lua_settop(L, 0);
jbe/bsw@0 1403 lua_newtable(L); // 1
jbe@397 1404 } else {
jbe@397 1405 luaL_checktype(L, 1, LUA_TTABLE);
jbe@397 1406 lua_settop(L, 1);
jbe/bsw@0 1407 }
jbe@23 1408 // set meta-table for database classes (models):
jbe/bsw@0 1409 lua_getfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe/bsw@0 1410 lua_setmetatable(L, 1);
jbe@23 1411 // check, if "prototype" attribute is not set:
jbe/bsw@0 1412 lua_pushliteral(L, "prototype"); // 2
jbe/bsw@0 1413 lua_rawget(L, 1); // 2
jbe/bsw@0 1414 if (!lua_toboolean(L, 2)) {
jbe@23 1415 // set "prototype" attribute to default prototype:
jbe/bsw@0 1416 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1417 lua_getfield(L,
jbe/bsw@0 1418 LUA_REGISTRYINDEX,
jbe/bsw@0 1419 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1420 ); // 4
jbe/bsw@0 1421 lua_rawset(L, 1);
jbe/bsw@0 1422 }
jbe@23 1423 // set "object" attribute to empty table, unless it is already set:
jbe/bsw@0 1424 lua_settop(L, 1);
jbe/bsw@0 1425 lua_pushliteral(L, "object"); // 2
jbe/bsw@0 1426 lua_rawget(L, 1); // 2
jbe/bsw@0 1427 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1428 lua_pushliteral(L, "object"); // 3
jbe/bsw@0 1429 lua_newtable(L); // 4
jbe/bsw@0 1430 lua_rawset(L, 1);
jbe/bsw@0 1431 }
jbe@23 1432 // set "object_get" attribute to empty table, unless it is already set:
jbe/bsw@0 1433 lua_settop(L, 1);
jbe/bsw@0 1434 lua_pushliteral(L, "object_get"); // 2
jbe/bsw@0 1435 lua_rawget(L, 1); // 2
jbe/bsw@0 1436 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1437 lua_pushliteral(L, "object_get"); // 3
jbe/bsw@0 1438 lua_newtable(L); // 4
jbe/bsw@0 1439 lua_rawset(L, 1);
jbe/bsw@0 1440 }
jbe@23 1441 // set "object_set" attribute to empty table, unless it is already set:
jbe/bsw@0 1442 lua_settop(L, 1);
jbe/bsw@0 1443 lua_pushliteral(L, "object_set"); // 2
jbe/bsw@0 1444 lua_rawget(L, 1); // 2
jbe/bsw@0 1445 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1446 lua_pushliteral(L, "object_set"); // 3
jbe/bsw@0 1447 lua_newtable(L); // 4
jbe/bsw@0 1448 lua_rawset(L, 1);
jbe/bsw@0 1449 }
jbe@23 1450 // set "list" attribute to empty table, unless it is already set:
jbe/bsw@0 1451 lua_settop(L, 1);
jbe/bsw@0 1452 lua_pushliteral(L, "list"); // 2
jbe/bsw@0 1453 lua_rawget(L, 1); // 2
jbe/bsw@0 1454 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1455 lua_pushliteral(L, "list"); // 3
jbe/bsw@0 1456 lua_newtable(L); // 4
jbe/bsw@0 1457 lua_rawset(L, 1);
jbe/bsw@0 1458 }
jbe@23 1459 // set "references" attribute to empty table, unless it is already set:
jbe/bsw@0 1460 lua_settop(L, 1);
jbe/bsw@0 1461 lua_pushliteral(L, "references"); // 2
jbe/bsw@0 1462 lua_rawget(L, 1); // 2
jbe/bsw@0 1463 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1464 lua_pushliteral(L, "references"); // 3
jbe/bsw@0 1465 lua_newtable(L); // 4
jbe/bsw@0 1466 lua_rawset(L, 1);
jbe/bsw@0 1467 }
jbe@23 1468 // set "foreign_keys" attribute to empty table, unless it is already set:
jbe/bsw@0 1469 lua_settop(L, 1);
jbe/bsw@0 1470 lua_pushliteral(L, "foreign_keys"); // 2
jbe/bsw@0 1471 lua_rawget(L, 1); // 2
jbe/bsw@0 1472 if (!lua_toboolean(L, 2)) {
jbe/bsw@0 1473 lua_pushliteral(L, "foreign_keys"); // 3
jbe/bsw@0 1474 lua_newtable(L); // 4
jbe/bsw@0 1475 lua_rawset(L, 1);
jbe/bsw@0 1476 }
jbe@23 1477 // return table:
jbe/bsw@0 1478 lua_settop(L, 1);
jbe/bsw@0 1479 return 1;
jbe/bsw@0 1480 }
jbe/bsw@0 1481
jbe@23 1482 // method "get_reference" of classes (models):
jbe/bsw@0 1483 static int mondelefant_class_get_reference(lua_State *L) {
jbe/bsw@0 1484 lua_settop(L, 2);
jbe/bsw@0 1485 while (lua_toboolean(L, 1)) {
jbe@23 1486 // get "references" table:
jbe/bsw@0 1487 lua_getfield(L, 1, "references"); // 3
jbe@23 1488 // perform lookup:
jbe/bsw@0 1489 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1490 lua_gettable(L, 3); // 4
jbe@23 1491 // return result, if lookup was successful:
jbe/bsw@0 1492 if (!lua_isnil(L, 4)) return 1;
jbe@23 1493 // replace current table by its prototype:
jbe/bsw@0 1494 lua_settop(L, 2);
jbe/bsw@0 1495 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1496 lua_rawget(L, 1); // 3
jbe/bsw@0 1497 lua_replace(L, 1);
jbe/bsw@0 1498 }
jbe@23 1499 // return nothing:
jbe/bsw@0 1500 return 0;
jbe/bsw@0 1501 }
jbe/bsw@0 1502
jbe@23 1503 // method "iterate_over_references" of classes (models):
jbe/bsw@0 1504 static int mondelefant_class_iterate_over_references(lua_State *L) {
jbe/bsw@0 1505 return luaL_error(L, "Reference iterator not implemented yet."); // TODO
jbe/bsw@0 1506 }
jbe/bsw@0 1507
jbe@23 1508 // method "get_foreign_key_reference_name" of classes (models):
jbe/bsw@0 1509 static int mondelefant_class_get_foreign_key_reference_name(lua_State *L) {
jbe/bsw@0 1510 lua_settop(L, 2);
jbe/bsw@0 1511 while (lua_toboolean(L, 1)) {
jbe@23 1512 // get "foreign_keys" table:
jbe/bsw@0 1513 lua_getfield(L, 1, "foreign_keys"); // 3
jbe@23 1514 // perform lookup:
jbe/bsw@0 1515 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1516 lua_gettable(L, 3); // 4
jbe@23 1517 // return result, if lookup was successful:
jbe/bsw@0 1518 if (!lua_isnil(L, 4)) return 1;
jbe@23 1519 // replace current table by its prototype:
jbe/bsw@0 1520 lua_settop(L, 2);
jbe/bsw@0 1521 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1522 lua_rawget(L, 1); // 3
jbe/bsw@0 1523 lua_replace(L, 1);
jbe/bsw@0 1524 }
jbe@23 1525 // return nothing:
jbe/bsw@0 1526 return 0;
jbe/bsw@0 1527 }
jbe/bsw@0 1528
jbe@23 1529 // meta-method "__index" of database result lists and objects:
jbe/bsw@0 1530 static int mondelefant_result_index(lua_State *L) {
jbe/bsw@0 1531 const char *result_type;
jbe@23 1532 // only lookup, when key is a string not beginning with an underscore:
jbe/bsw@0 1533 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe@23 1534 return 0;
jbe/bsw@0 1535 }
jbe@384 1536 // value of "_class" attribute or default class on stack position 3:
jbe@23 1537 lua_settop(L, 2);
jbe/bsw@0 1538 lua_getfield(L, 1, "_class"); // 3
jbe/bsw@0 1539 if (!lua_toboolean(L, 3)) {
jbe/bsw@0 1540 lua_settop(L, 2);
jbe/bsw@0 1541 lua_getfield(L,
jbe/bsw@0 1542 LUA_REGISTRYINDEX,
jbe/bsw@0 1543 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1544 ); // 3
jbe/bsw@0 1545 }
jbe@23 1546 // get value of "_type" attribute:
jbe/bsw@0 1547 lua_getfield(L, 1, "_type"); // 4
jbe/bsw@0 1548 result_type = lua_tostring(L, 4);
jbe@23 1549 // different lookup for lists and objects:
jbe@23 1550 if (result_type && !strcmp(result_type, "object")) { // object
jbe/bsw@0 1551 lua_settop(L, 3);
jbe@384 1552 // try inherited attributes, methods or getter functions:
jbe@383 1553 lua_pushvalue(L, 3); // 4
jbe@383 1554 while (lua_toboolean(L, 4)) {
jbe@383 1555 lua_getfield(L, 4, "object"); // 5
jbe@383 1556 lua_pushvalue(L, 2); // 6
jbe@383 1557 lua_gettable(L, 5); // 6
jbe@383 1558 if (!lua_isnil(L, 6)) return 1;
jbe@383 1559 lua_settop(L, 4);
jbe@383 1560 lua_getfield(L, 4, "object_get"); // 5
jbe@383 1561 lua_pushvalue(L, 2); // 6
jbe@383 1562 lua_gettable(L, 5); // 6
jbe@383 1563 if (lua_toboolean(L, 6)) {
jbe@383 1564 lua_pushvalue(L, 1); // 7
jbe@383 1565 lua_call(L, 1, 1); // 6
jbe/bsw@0 1566 return 1;
jbe/bsw@0 1567 }
jbe@383 1568 lua_settop(L, 4);
jbe@383 1569 lua_pushliteral(L, "prototype"); // 5
jbe@383 1570 lua_rawget(L, 4); // 5
jbe@383 1571 lua_replace(L, 4);
jbe/bsw@0 1572 }
jbe@383 1573 lua_settop(L, 3);
jbe/bsw@0 1574 // try primary keys of referenced objects:
jbe/bsw@0 1575 lua_pushcfunction(L,
jbe/bsw@0 1576 mondelefant_class_get_foreign_key_reference_name
jbe@383 1577 ); // 4
jbe@383 1578 lua_pushvalue(L, 3); // 5
jbe@383 1579 lua_pushvalue(L, 2); // 6
jbe@383 1580 lua_call(L, 2, 1); // 4
jbe@383 1581 if (!lua_isnil(L, 4)) {
jbe@383 1582 // reference name at stack position 4
jbe@383 1583 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@382 1584 lua_pushvalue(L, 3); // 6
jbe@383 1585 lua_pushvalue(L, 4); // 7
jbe@383 1586 lua_call(L, 2, 1); // reference info at stack position 5
jbe@383 1587 lua_getfield(L, 1, "_ref"); // 6
jbe@383 1588 lua_getfield(L, 5, "ref"); // 7
jbe@383 1589 lua_gettable(L, 6); // 7
jbe@383 1590 if (!lua_isnil(L, 7)) {
jbe@383 1591 if (lua_toboolean(L, 7)) {
jbe@383 1592 lua_getfield(L, 5, "that_key"); // 8
jbe@383 1593 if (lua_isnil(L, 8)) {
jbe/bsw@0 1594 return luaL_error(L, "Missing 'that_key' entry in model reference.");
jbe/bsw@0 1595 }
jbe@383 1596 lua_gettable(L, 7); // 8
jbe/bsw@0 1597 } else {
jbe/bsw@0 1598 lua_pushnil(L);
jbe/bsw@0 1599 }
jbe/bsw@0 1600 return 1;
jbe/bsw@0 1601 }
jbe/bsw@0 1602 }
jbe@383 1603 lua_settop(L, 3);
jbe@383 1604 lua_getfield(L, 1, "_data"); // _data table on stack position 4
jbe/bsw@0 1605 // try normal data field info:
jbe@383 1606 lua_pushvalue(L, 2); // 5
jbe@383 1607 lua_gettable(L, 4); // 5
jbe@383 1608 if (!lua_isnil(L, 5)) return 1;
jbe@383 1609 lua_settop(L, 4); // keep _data table on stack
jbe/bsw@0 1610 // try cached referenced object (or cached NULL reference):
jbe@383 1611 lua_getfield(L, 1, "_ref"); // 5
jbe@383 1612 lua_pushvalue(L, 2); // 6
jbe@383 1613 lua_gettable(L, 5); // 6
jbe@383 1614 if (lua_isboolean(L, 6) && !lua_toboolean(L, 6)) {
jbe/bsw@0 1615 lua_pushnil(L);
jbe/bsw@0 1616 return 1;
jbe@383 1617 } else if (!lua_isnil(L, 6)) {
jbe/bsw@0 1618 return 1;
jbe/bsw@0 1619 }
jbe@383 1620 lua_settop(L, 4);
jbe/bsw@0 1621 // try to load a referenced object:
jbe@383 1622 lua_pushcfunction(L, mondelefant_class_get_reference); // 5
jbe@383 1623 lua_pushvalue(L, 3); // 6
jbe@383 1624 lua_pushvalue(L, 2); // 7
jbe@383 1625 lua_call(L, 2, 1); // 5
jbe@383 1626 if (!lua_isnil(L, 5)) {
jbe/bsw@0 1627 lua_settop(L, 2);
jbe/bsw@0 1628 lua_getfield(L, 1, "load"); // 3
jbe/bsw@0 1629 lua_pushvalue(L, 1); // 4 (self)
jbe/bsw@0 1630 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1631 lua_call(L, 2, 0);
jbe/bsw@0 1632 lua_settop(L, 2);
jbe/bsw@0 1633 lua_getfield(L, 1, "_ref"); // 3
jbe/bsw@0 1634 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1635 lua_gettable(L, 3); // 4
jbe/bsw@0 1636 if (lua_isboolean(L, 4) && !lua_toboolean(L, 4)) lua_pushnil(L); // TODO: use special object instead of false
jbe/bsw@0 1637 return 1;
jbe/bsw@0 1638 }
jbe@383 1639 lua_settop(L, 4);
jbe@383 1640 // try proxy access to document in special column:
jbe@383 1641 lua_getfield(L, 3, "document_column"); // 5
jbe@383 1642 if (lua_toboolean(L, 5)) {
jbe@383 1643 lua_gettable(L, 4); // 5
jbe@383 1644 if (!lua_isnil(L, 5)) {
jbe@383 1645 lua_pushvalue(L, 2); // 6
jbe@383 1646 lua_gettable(L, 5); // 6
jbe@383 1647 if (!lua_isnil(L, 6)) return 1;
jbe@383 1648 }
jbe@383 1649 }
jbe/bsw@0 1650 return 0;
jbe@23 1651 } else if (result_type && !strcmp(result_type, "list")) { // list
jbe/bsw@0 1652 lua_settop(L, 3);
jbe/bsw@0 1653 // try inherited list attributes or methods:
jbe/bsw@0 1654 while (lua_toboolean(L, 3)) {
jbe/bsw@0 1655 lua_getfield(L, 3, "list"); // 4
jbe/bsw@0 1656 lua_pushvalue(L, 2); // 5
jbe/bsw@0 1657 lua_gettable(L, 4); // 5
jbe/bsw@0 1658 if (!lua_isnil(L, 5)) return 1;
jbe/bsw@0 1659 lua_settop(L, 3);
jbe/bsw@0 1660 lua_pushliteral(L, "prototype"); // 4
jbe/bsw@0 1661 lua_rawget(L, 3); // 4
jbe/bsw@0 1662 lua_replace(L, 3);
jbe/bsw@0 1663 }
jbe/bsw@0 1664 }
jbe@23 1665 // return nothing:
jbe/bsw@0 1666 return 0;
jbe/bsw@0 1667 }
jbe/bsw@0 1668
jbe@23 1669 // meta-method "__newindex" of database result lists and objects:
jbe/bsw@0 1670 static int mondelefant_result_newindex(lua_State *L) {
jbe/bsw@0 1671 const char *result_type;
jbe@23 1672 // perform rawset, unless key is a string not starting with underscore:
jbe/bsw@0 1673 lua_settop(L, 3);
jbe/bsw@0 1674 if (lua_type(L, 2) != LUA_TSTRING || lua_tostring(L, 2)[0] == '_') {
jbe/bsw@0 1675 lua_rawset(L, 1);
jbe/bsw@0 1676 return 1;
jbe/bsw@0 1677 }
jbe@384 1678 // value of "_class" attribute or default class on stack position 4:
jbe@384 1679 lua_settop(L, 3);
jbe/bsw@0 1680 lua_getfield(L, 1, "_class"); // 4
jbe/bsw@0 1681 if (!lua_toboolean(L, 4)) {
jbe/bsw@0 1682 lua_settop(L, 3);
jbe/bsw@0 1683 lua_getfield(L,
jbe/bsw@0 1684 LUA_REGISTRYINDEX,
jbe/bsw@0 1685 MONDELEFANT_CLASS_PROTO_REGKEY
jbe/bsw@0 1686 ); // 4
jbe/bsw@0 1687 }
jbe@23 1688 // get value of "_type" attribute:
jbe/bsw@0 1689 lua_getfield(L, 1, "_type"); // 5
jbe/bsw@0 1690 result_type = lua_tostring(L, 5);
jbe@378 1691 // distinguish between lists and objects:
jbe@378 1692 if (result_type && !strcmp(result_type, "object")) { // objects
jbe@378 1693 lua_settop(L, 4);
jbe@378 1694 // try object setter functions:
jbe@384 1695 lua_pushvalue(L, 4); // 5
jbe@384 1696 while (lua_toboolean(L, 5)) {
jbe@384 1697 lua_getfield(L, 5, "object_set"); // 6
jbe@384 1698 lua_pushvalue(L, 2); // 7
jbe@384 1699 lua_gettable(L, 6); // 7
jbe@384 1700 if (lua_toboolean(L, 7)) {
jbe@384 1701 lua_pushvalue(L, 1); // 8
jbe@384 1702 lua_pushvalue(L, 3); // 9
jbe@378 1703 lua_call(L, 2, 0);
jbe@378 1704 return 0;
jbe@378 1705 }
jbe@384 1706 lua_settop(L, 5);
jbe@384 1707 lua_pushliteral(L, "prototype"); // 6
jbe@384 1708 lua_rawget(L, 5); // 6
jbe@384 1709 lua_replace(L, 5);
jbe@378 1710 }
jbe@384 1711 lua_settop(L, 4);
jbe@384 1712 lua_getfield(L, 1, "_data"); // _data table on stack position 5
jbe/bsw@0 1713 // check, if a object reference is changed:
jbe@384 1714 lua_pushcfunction(L, mondelefant_class_get_reference); // 6
jbe@384 1715 lua_pushvalue(L, 4); // 7
jbe@384 1716 lua_pushvalue(L, 2); // 8
jbe@384 1717 lua_call(L, 2, 1); // 6
jbe@384 1718 if (!lua_isnil(L, 6)) {
jbe/bsw@0 1719 // store object in _ref table (use false for nil): // TODO: use special object instead of false
jbe@384 1720 lua_getfield(L, 1, "_ref"); // 7
jbe@384 1721 lua_pushvalue(L, 2); // 8
jbe@384 1722 if (lua_isnil(L, 3)) lua_pushboolean(L, 0); // 9
jbe@384 1723 else lua_pushvalue(L, 3); // 9
jbe@384 1724 lua_settable(L, 7);
jbe@384 1725 lua_settop(L, 6);
jbe/bsw@0 1726 // delete referencing key from _data table:
jbe@384 1727 lua_getfield(L, 6, "this_key"); // 7
jbe@384 1728 if (lua_isnil(L, 7)) {
jbe/bsw@0 1729 return luaL_error(L, "Missing 'this_key' entry in model reference.");
jbe/bsw@0 1730 }
jbe@384 1731 lua_pushvalue(L, 7); // 8
jbe@384 1732 lua_pushnil(L); // 9
jbe@384 1733 lua_settable(L, 5);
jbe@384 1734 lua_getfield(L, 1, "_dirty"); // 8
jbe@384 1735 lua_pushvalue(L, 7); // 9
jbe@384 1736 lua_pushboolean(L, 1); // 10
jbe@384 1737 lua_settable(L, 8);
jbe@384 1738 return 0;
jbe@384 1739 }
jbe@384 1740 lua_settop(L, 5);
jbe@384 1741 // check proxy access to document in special column:
jbe@384 1742 lua_getfield(L, 4, "document_column"); // 6
jbe@384 1743 if (lua_toboolean(L, 6)) {
jbe@384 1744 lua_getfield(L, 1, "_column_info"); // 7
jbe@401 1745 if (!lua_isnil(L, 7)) { // TODO: quick fix to avoid problems on document creation
jbe@384 1746 lua_pushvalue(L, 2); // 8
jbe@384 1747 lua_gettable(L, 7); // 8
jbe@400 1748 if (!lua_toboolean(L, 8)) {
jbe@384 1749 lua_settop(L, 6);
jbe@384 1750 lua_gettable(L, 5); // 6
jbe@384 1751 if (lua_isnil(L, 6)) {
jbe@384 1752 return luaL_error(L, "Cannot write to document column: document is nil");
jbe@384 1753 }
jbe@384 1754 lua_pushvalue(L, 2); // 7
jbe@384 1755 lua_pushvalue(L, 3); // 8
jbe@384 1756 lua_settable(L, 6);
jbe@384 1757 return 0;
jbe@384 1758 }
jbe@401 1759 } // TODO: quick fix to avoid problems on document creation
jbe@384 1760 }
jbe@384 1761 lua_settop(L, 5);
jbe@384 1762 // store value in data field info:
jbe@384 1763 lua_pushvalue(L, 2); // 6
jbe@384 1764 lua_pushvalue(L, 3); // 7
jbe@384 1765 lua_settable(L, 5);
jbe@384 1766 lua_settop(L, 4);
jbe@384 1767 // mark field as dirty (needs to be UPDATEd on save):
jbe@384 1768 lua_getfield(L, 1, "_dirty"); // 5
jbe@384 1769 lua_pushvalue(L, 2); // 6
jbe@384 1770 lua_pushboolean(L, 1); // 7
jbe@384 1771 lua_settable(L, 5);
jbe@384 1772 lua_settop(L, 4);
jbe@384 1773 // reset reference cache, if neccessary:
jbe@384 1774 lua_pushcfunction(L,
jbe@384 1775 mondelefant_class_get_foreign_key_reference_name
jbe@384 1776 ); // 5
jbe@384 1777 lua_pushvalue(L, 4); // 6
jbe@384 1778 lua_pushvalue(L, 2); // 7
jbe@384 1779 lua_call(L, 2, 1); // 5
jbe@384 1780 if (!lua_isnil(L, 5)) {
jbe@384 1781 lua_getfield(L, 1, "_ref"); // 6
jbe@382 1782 lua_pushvalue(L, 5); // 7
jbe@382 1783 lua_pushnil(L); // 8
jbe@382 1784 lua_settable(L, 6);
jbe/bsw@0 1785 }
jbe/bsw@0 1786 return 0;
jbe@23 1787 } else { // non-objects (i.e. lists)
jbe@23 1788 // perform rawset:
jbe/bsw@0 1789 lua_settop(L, 3);
jbe/bsw@0 1790 lua_rawset(L, 1);
jbe/bsw@0 1791 return 0;
jbe/bsw@0 1792 }
jbe/bsw@0 1793 }
jbe/bsw@0 1794
jbe@23 1795 // meta-method "__index" of classes (models):
jbe/bsw@0 1796 static int mondelefant_class_index(lua_State *L) {
jbe@23 1797 // perform lookup in prototype:
jbe/bsw@0 1798 lua_settop(L, 2);
jbe/bsw@0 1799 lua_pushliteral(L, "prototype"); // 3
jbe/bsw@0 1800 lua_rawget(L, 1); // 3
jbe/bsw@0 1801 lua_pushvalue(L, 2); // 4
jbe/bsw@0 1802 lua_gettable(L, 3); // 4
jbe/bsw@0 1803 return 1;
jbe/bsw@0 1804 }
jbe/bsw@0 1805
jbe@23 1806 // registration information for functions of library:
jbe/bsw@0 1807 static const struct luaL_Reg mondelefant_module_functions[] = {
jbe/bsw@0 1808 {"connect", mondelefant_connect},
jbe/bsw@0 1809 {"set_class", mondelefant_set_class},
jbe/bsw@0 1810 {"new_class", mondelefant_new_class},
jbe/bsw@0 1811 {NULL, NULL}
jbe/bsw@0 1812 };
jbe/bsw@0 1813
jbe@23 1814 // registration information for meta-methods of database connections:
jbe/bsw@0 1815 static const struct luaL_Reg mondelefant_conn_mt_functions[] = {
jbe/bsw@0 1816 {"__gc", mondelefant_conn_free},
jbe/bsw@0 1817 {"__index", mondelefant_conn_index},
jbe/bsw@0 1818 {"__newindex", mondelefant_conn_newindex},
jbe/bsw@0 1819 {NULL, NULL}
jbe/bsw@0 1820 };
jbe/bsw@0 1821
jbe@23 1822 // registration information for methods of database connections:
jbe/bsw@0 1823 static const struct luaL_Reg mondelefant_conn_methods[] = {
jbe/bsw@0 1824 {"close", mondelefant_conn_close},
jbe/bsw@0 1825 {"is_ok", mondelefant_conn_is_ok},
jbe/bsw@0 1826 {"get_transaction_status", mondelefant_conn_get_transaction_status},
jbe@397 1827 {"try_wait", mondelefant_conn_try_wait},
jbe@393 1828 {"wait", mondelefant_conn_wait},
jbe/bsw@0 1829 {"create_list", mondelefant_conn_create_list},
jbe/bsw@0 1830 {"create_object", mondelefant_conn_create_object},
jbe/bsw@0 1831 {"quote_string", mondelefant_conn_quote_string},
jbe/bsw@0 1832 {"quote_binary", mondelefant_conn_quote_binary},
jbe/bsw@0 1833 {"assemble_command", mondelefant_conn_assemble_command},
jbe/bsw@0 1834 {"try_query", mondelefant_conn_try_query},
jbe/bsw@0 1835 {"query", mondelefant_conn_query},
jbe/bsw@0 1836 {NULL, NULL}
jbe/bsw@0 1837 };
jbe/bsw@0 1838
jbe@23 1839 // registration information for meta-methods of error objects:
jbe/bsw@0 1840 static const struct luaL_Reg mondelefant_errorobject_mt_functions[] = {
jbe/bsw@0 1841 {NULL, NULL}
jbe/bsw@0 1842 };
jbe/bsw@0 1843
jbe@23 1844 // registration information for methods of error objects:
jbe/bsw@0 1845 static const struct luaL_Reg mondelefant_errorobject_methods[] = {
jbe@397 1846 {"escalate", lua_error},
jbe/bsw@0 1847 {"is_kind_of", mondelefant_errorobject_is_kind_of},
jbe/bsw@0 1848 {NULL, NULL}
jbe/bsw@0 1849 };
jbe/bsw@0 1850
jbe@23 1851 // registration information for meta-methods of database result lists/objects:
jbe/bsw@0 1852 static const struct luaL_Reg mondelefant_result_mt_functions[] = {
jbe/bsw@0 1853 {"__index", mondelefant_result_index},
jbe/bsw@0 1854 {"__newindex", mondelefant_result_newindex},
jbe/bsw@0 1855 {NULL, NULL}
jbe/bsw@0 1856 };
jbe/bsw@0 1857
jbe@23 1858 // registration information for methods of database result lists/objects:
jbe/bsw@0 1859 static const struct luaL_Reg mondelefant_class_mt_functions[] = {
jbe/bsw@0 1860 {"__index", mondelefant_class_index},
jbe/bsw@0 1861 {NULL, NULL}
jbe/bsw@0 1862 };
jbe/bsw@0 1863
jbe@23 1864 // registration information for methods of classes (models):
jbe/bsw@0 1865 static const struct luaL_Reg mondelefant_class_methods[] = {
jbe/bsw@0 1866 {"get_reference", mondelefant_class_get_reference},
jbe/bsw@0 1867 {"iterate_over_references", mondelefant_class_iterate_over_references},
jbe/bsw@0 1868 {"get_foreign_key_reference_name",
jbe/bsw@0 1869 mondelefant_class_get_foreign_key_reference_name},
jbe/bsw@0 1870 {NULL, NULL}
jbe/bsw@0 1871 };
jbe/bsw@0 1872
jbe@23 1873 // registration information for methods of database result objects (not lists!):
jbe/bsw@0 1874 static const struct luaL_Reg mondelefant_object_methods[] = {
jbe/bsw@0 1875 {NULL, NULL}
jbe/bsw@0 1876 };
jbe/bsw@0 1877
jbe@23 1878 // registration information for methods of database result lists (not single objects!):
jbe/bsw@0 1879 static const struct luaL_Reg mondelefant_list_methods[] = {
jbe/bsw@0 1880 {NULL, NULL}
jbe/bsw@0 1881 };
jbe/bsw@0 1882
jbe@23 1883 // luaopen function to initialize/register library:
jbe/bsw@0 1884 int luaopen_mondelefant_native(lua_State *L) {
jbe/bsw@0 1885 lua_settop(L, 0);
jbe/bsw@0 1886 lua_newtable(L); // module at stack position 1
jbe@64 1887 luaL_setfuncs(L, mondelefant_module_functions, 0);
jbe/bsw@0 1888
jbe/bsw@0 1889 lua_pushvalue(L, 1); // 2
jbe/bsw@0 1890 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_MODULE_REGKEY);
jbe/bsw@0 1891
jbe/bsw@0 1892 lua_newtable(L); // 2
jbe/bsw@0 1893 // NOTE: only PostgreSQL is supported yet:
jbe@64 1894 luaL_setfuncs(L, mondelefant_conn_methods, 0);
jbe/bsw@0 1895 lua_setfield(L, 1, "postgresql_connection_prototype");
jbe/bsw@0 1896 lua_newtable(L); // 2
jbe/bsw@0 1897 lua_setfield(L, 1, "connection_prototype");
jbe/bsw@0 1898
jbe/bsw@0 1899 luaL_newmetatable(L, MONDELEFANT_CONN_MT_REGKEY); // 2
jbe@64 1900 luaL_setfuncs(L, mondelefant_conn_mt_functions, 0);
jbe/bsw@0 1901 lua_settop(L, 1);
jbe/bsw@0 1902 luaL_newmetatable(L, MONDELEFANT_RESULT_MT_REGKEY); // 2
jbe@64 1903 luaL_setfuncs(L, mondelefant_result_mt_functions, 0);
jbe/bsw@0 1904 lua_setfield(L, 1, "result_metatable");
jbe/bsw@0 1905 luaL_newmetatable(L, MONDELEFANT_CLASS_MT_REGKEY); // 2
jbe@64 1906 luaL_setfuncs(L, mondelefant_class_mt_functions, 0);
jbe/bsw@0 1907 lua_setfield(L, 1, "class_metatable");
jbe/bsw@0 1908
jbe/bsw@0 1909 lua_newtable(L); // 2
jbe@272 1910 luaL_setfuncs(L, mondelefant_class_methods, 0);
jbe/bsw@0 1911 lua_newtable(L); // 3
jbe@64 1912 luaL_setfuncs(L, mondelefant_object_methods, 0);
jbe/bsw@0 1913 lua_setfield(L, 2, "object");
jbe/bsw@0 1914 lua_newtable(L); // 3
jbe/bsw@0 1915 lua_setfield(L, 2, "object_get");
jbe/bsw@0 1916 lua_newtable(L); // 3
jbe/bsw@0 1917 lua_setfield(L, 2, "object_set");
jbe/bsw@0 1918 lua_newtable(L); // 3
jbe@64 1919 luaL_setfuncs(L, mondelefant_list_methods, 0);
jbe/bsw@0 1920 lua_setfield(L, 2, "list");
jbe/bsw@0 1921 lua_newtable(L); // 3
jbe/bsw@0 1922 lua_setfield(L, 2, "references");
jbe/bsw@0 1923 lua_newtable(L); // 3
jbe/bsw@0 1924 lua_setfield(L, 2, "foreign_keys");
jbe/bsw@0 1925 lua_pushvalue(L, 2); // 3
jbe/bsw@0 1926 lua_setfield(L, LUA_REGISTRYINDEX, MONDELEFANT_CLASS_PROTO_REGKEY);
jbe/bsw@0 1927 lua_setfield(L, 1, "class_prototype");
jbe/bsw@0 1928
jbe/bsw@0 1929 luaL_newmetatable(L, MONDELEFANT_ERROROBJECT_MT_REGKEY); // 2
jbe@64 1930 luaL_setfuncs(L, mondelefant_errorobject_mt_functions, 0);
jbe/bsw@0 1931 lua_newtable(L); // 3
jbe@64 1932 luaL_setfuncs(L, mondelefant_errorobject_methods, 0);
jbe/bsw@0 1933 lua_setfield(L, 2, "__index");
jbe/bsw@0 1934 lua_setfield(L, 1, "errorobject_metatable");
jbe/bsw@0 1935
jbe/bsw@0 1936 return 1;
jbe/bsw@0 1937 }

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