lib/tdb/pytdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Python interface to tdb.
   5
   6    Copyright (C) 2004-2006 Tim Potter <tpot@samba.org>
   7    Copyright (C) 2007-2008 Jelmer Vernooij <jelmer@samba.org>
   8
   9      ** NOTE! The following LGPL license applies to the tdb
  10      ** library. This does NOT imply that all of Samba is released
  11      ** under the LGPL
  12
  13    This library is free software; you can redistribute it and/or
  14    modify it under the terms of the GNU Lesser General Public
  15    License as published by the Free Software Foundation; either
  16    version 3 of the License, or (at your option) any later version.
  17
  18    This library is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21    Lesser General Public License for more details.
  22
  23    You should have received a copy of the GNU Lesser General Public
  24    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  25 */
  26
  27 #include <Python.h>
  28 #include "replace.h"
  29 #include "system/filesys.h"
  30
  31 /* Include tdb headers */
  32 #include <tdb.h>
  33
  34 typedef struct {
  35         PyObject_HEAD
  36         TDB_CONTEXT *ctx;
  37         bool closed;
  38 } PyTdbObject;
  39
  40 staticforward PyTypeObject PyTdb;
  41
  42 static void PyErr_SetTDBError(TDB_CONTEXT *tdb)
  43 {
  44         PyErr_SetObject(PyExc_RuntimeError,
  45                 Py_BuildValue("(i,s)", tdb_error(tdb), tdb_errorstr(tdb)));
  46 }
  47
  48 static TDB_DATA PyString_AsTDB_DATA(PyObject *data)
  49 {
  50         TDB_DATA ret;
  51         ret.dptr = (unsigned char *)PyString_AsString(data);
  52         ret.dsize = PyString_Size(data);
  53         return ret;
  54 }
  55
  56 static PyObject *PyString_FromTDB_DATA(TDB_DATA data)
  57 {
  58         if (data.dptr == NULL && data.dsize == 0) {
  59                 Py_RETURN_NONE;
  60         } else {
  61                 PyObject *ret = PyString_FromStringAndSize((const char *)data.dptr,
  62                                                                                                    data.dsize);
  63                 free(data.dptr);
  64                 return ret;
  65     }
  66 }
  67
  68 #define PyErr_TDB_ERROR_IS_ERR_RAISE(ret, tdb) \
  69         if (ret != 0) { \
  70                 PyErr_SetTDBError(tdb); \
  71                 return NULL; \
  72         }
  73
  74 #define PyErr_TDB_RAISE_IF_CLOSED(self) \
  75         if (self->closed) {                                             \
  76                 PyErr_SetObject(PyExc_RuntimeError,                             \
  77                                 Py_BuildValue("(i,s)", TDB_ERR_IO, "Database is already closed")); \
  78                 return NULL;                                            \
  79         }
  80
  81 #define PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self) \
  82         if (self->closed) {                                             \
  83                 PyErr_SetObject(PyExc_RuntimeError,                             \
  84                                 Py_BuildValue("(i,s)", TDB_ERR_IO, "Database is already closed")); \
  85                 return -1;                                              \
  86         }
  87
  88 static PyObject *py_tdb_open(PyTypeObject *type, PyObject *args, PyObject *kwargs)
  89 {
  90         char *name = NULL;
  91         int hash_size = 0, tdb_flags = TDB_DEFAULT, flags = O_RDWR, mode = 0600;
  92         TDB_CONTEXT *ctx;
  93         PyTdbObject *ret;
  94         const char *kwnames[] = { "name", "hash_size", "tdb_flags", "flags", "mode", NULL };
  95
  96         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|siiii", (char **)kwnames, &name, &hash_size, &tdb_flags, &flags, &mode))
  97                 return NULL;
  98
  99         if (name == NULL) {
 100                 tdb_flags |= TDB_INTERNAL;
 101         }
 102
 103         ctx = tdb_open(name, hash_size, tdb_flags, flags, mode);
 104         if (ctx == NULL) {
 105                 PyErr_SetFromErrno(PyExc_IOError);
 106                 return NULL;
 107         }
 108
 109         ret = PyObject_New(PyTdbObject, &PyTdb);
 110         if (!ret) {
 111                 tdb_close(ctx);
 112                 return NULL;
 113         }
 114
 115         ret->ctx = ctx;
 116         ret->closed = false;
 117         return (PyObject *)ret;
 118 }
 119
 120 static PyObject *obj_transaction_cancel(PyTdbObject *self)
 121 {
 122         int ret;
 123
 124         PyErr_TDB_RAISE_IF_CLOSED(self);
 125
 126         ret = tdb_transaction_cancel(self->ctx);
 127         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 128         Py_RETURN_NONE;
 129 }
 130
 131 static PyObject *obj_transaction_commit(PyTdbObject *self)
 132 {
 133         int ret;
 134         PyErr_TDB_RAISE_IF_CLOSED(self);
 135         ret = tdb_transaction_commit(self->ctx);
 136         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 137         Py_RETURN_NONE;
 138 }
 139
 140 static PyObject *obj_transaction_prepare_commit(PyTdbObject *self)
 141 {
 142         int ret;
 143         PyErr_TDB_RAISE_IF_CLOSED(self);
 144         ret = tdb_transaction_prepare_commit(self->ctx);
 145         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 146         Py_RETURN_NONE;
 147 }
 148
 149 static PyObject *obj_transaction_start(PyTdbObject *self)
 150 {
 151         int ret;
 152         PyErr_TDB_RAISE_IF_CLOSED(self);
 153         ret = tdb_transaction_start(self->ctx);
 154         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 155         Py_RETURN_NONE;
 156 }
 157
 158 static PyObject *obj_reopen(PyTdbObject *self)
 159 {
 160         int ret;
 161         PyErr_TDB_RAISE_IF_CLOSED(self);
 162         ret = tdb_reopen(self->ctx);
 163         if (ret != 0) {
 164                 self->closed = true;
 165                 PyErr_SetObject(PyExc_RuntimeError,
 166                                 Py_BuildValue("(i,s)",
 167                                               TDB_ERR_IO,
 168                                               "Failed to reopen database"));
 169                 return NULL;
 170         }
 171         Py_RETURN_NONE;
 172 }
 173
 174 static PyObject *obj_lockall(PyTdbObject *self)
 175 {
 176         int ret;
 177         PyErr_TDB_RAISE_IF_CLOSED(self);
 178         ret = tdb_lockall(self->ctx);
 179         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 180         Py_RETURN_NONE;
 181 }
 182
 183 static PyObject *obj_unlockall(PyTdbObject *self)
 184 {
 185         int ret;
 186         PyErr_TDB_RAISE_IF_CLOSED(self);
 187         ret = tdb_unlockall(self->ctx);
 188         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 189         Py_RETURN_NONE;
 190 }
 191
 192 static PyObject *obj_lockall_read(PyTdbObject *self)
 193 {
 194         int ret;
 195         PyErr_TDB_RAISE_IF_CLOSED(self);
 196         ret = tdb_lockall_read(self->ctx);
 197         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 198         Py_RETURN_NONE;
 199 }
 200
 201 static PyObject *obj_unlockall_read(PyTdbObject *self)
 202 {
 203         int ret = tdb_unlockall_read(self->ctx);
 204         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 205         Py_RETURN_NONE;
 206 }
 207
 208 static PyObject *obj_close(PyTdbObject *self)
 209 {
 210         int ret;
 211         if (self->closed)
 212                 Py_RETURN_NONE;
 213         ret = tdb_close(self->ctx);
 214         self->closed = true;
 215         if (ret != 0) {
 216                 PyErr_SetObject(PyExc_RuntimeError,
 217                                 Py_BuildValue("(i,s)",
 218                                               TDB_ERR_IO,
 219                                               "Failed to close database"));
 220                 return NULL;
 221         }
 222         Py_RETURN_NONE;
 223 }
 224
 225 static PyObject *obj_get(PyTdbObject *self, PyObject *args)
 226 {
 227         TDB_DATA key;
 228         PyObject *py_key;
 229
 230         PyErr_TDB_RAISE_IF_CLOSED(self);
 231
 232         if (!PyArg_ParseTuple(args, "O", &py_key))
 233                 return NULL;
 234
 235         key = PyString_AsTDB_DATA(py_key);
 236         if (!key.dptr)
 237                 return NULL;
 238
 239         return PyString_FromTDB_DATA(tdb_fetch(self->ctx, key));
 240 }
 241
 242 static PyObject *obj_append(PyTdbObject *self, PyObject *args)
 243 {
 244         TDB_DATA key, data;
 245         PyObject *py_key, *py_data;
 246         int ret;
 247
 248         PyErr_TDB_RAISE_IF_CLOSED(self);
 249
 250         if (!PyArg_ParseTuple(args, "OO", &py_key, &py_data))
 251                 return NULL;
 252
 253         key = PyString_AsTDB_DATA(py_key);
 254         if (!key.dptr)
 255                 return NULL;
 256         data = PyString_AsTDB_DATA(py_data);
 257         if (!data.dptr)
 258                 return NULL;
 259
 260         ret = tdb_append(self->ctx, key, data);
 261         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 262         Py_RETURN_NONE;
 263 }
 264
 265 static PyObject *obj_firstkey(PyTdbObject *self)
 266 {
 267         PyErr_TDB_RAISE_IF_CLOSED(self);
 268
 269         return PyString_FromTDB_DATA(tdb_firstkey(self->ctx));
 270 }
 271
 272 static PyObject *obj_nextkey(PyTdbObject *self, PyObject *args)
 273 {
 274         TDB_DATA key;
 275         PyObject *py_key;
 276         PyErr_TDB_RAISE_IF_CLOSED(self);
 277
 278         if (!PyArg_ParseTuple(args, "O", &py_key))
 279                 return NULL;
 280
 281         key = PyString_AsTDB_DATA(py_key);
 282         if (!key.dptr)
 283                 return NULL;
 284
 285         return PyString_FromTDB_DATA(tdb_nextkey(self->ctx, key));
 286 }
 287
 288 static PyObject *obj_delete(PyTdbObject *self, PyObject *args)
 289 {
 290         TDB_DATA key;
 291         PyObject *py_key;
 292         int ret;
 293         PyErr_TDB_RAISE_IF_CLOSED(self);
 294
 295         if (!PyArg_ParseTuple(args, "O", &py_key))
 296                 return NULL;
 297
 298         key = PyString_AsTDB_DATA(py_key);
 299         if (!key.dptr)
 300                 return NULL;
 301         ret = tdb_delete(self->ctx, key);
 302         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 303         Py_RETURN_NONE;
 304 }
 305
 306 static PyObject *obj_has_key(PyTdbObject *self, PyObject *args)
 307 {
 308         TDB_DATA key;
 309         int ret;
 310         PyObject *py_key;
 311         PyErr_TDB_RAISE_IF_CLOSED(self);
 312
 313         if (!PyArg_ParseTuple(args, "O", &py_key))
 314                 return NULL;
 315
 316         key = PyString_AsTDB_DATA(py_key);
 317         if (!key.dptr)
 318                 return NULL;
 319         ret = tdb_exists(self->ctx, key);
 320         if (ret != TDB_ERR_NOEXIST) {
 321                 PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 322         }
 323
 324         return (ret == TDB_ERR_NOEXIST)?Py_False:Py_True;
 325 }
 326
 327 static PyObject *obj_store(PyTdbObject *self, PyObject *args)
 328 {
 329         TDB_DATA key, value;
 330         int ret;
 331         int flag = TDB_REPLACE;
 332         PyObject *py_key, *py_value;
 333
 334         PyErr_TDB_RAISE_IF_CLOSED(self);
 335
 336         if (!PyArg_ParseTuple(args, "OO|i", &py_key, &py_value, &flag))
 337                 return NULL;
 338
 339         key = PyString_AsTDB_DATA(py_key);
 340         if (!key.dptr)
 341                 return NULL;
 342         value = PyString_AsTDB_DATA(py_value);
 343         if (!value.dptr)
 344                 return NULL;
 345
 346         ret = tdb_store(self->ctx, key, value, flag);
 347         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 348         Py_RETURN_NONE;
 349 }
 350
 351 static PyObject *obj_add_flags(PyTdbObject *self, PyObject *args)
 352 {
 353         unsigned flags;
 354
 355         PyErr_TDB_RAISE_IF_CLOSED(self);
 356
 357         if (!PyArg_ParseTuple(args, "I", &flags))
 358                 return NULL;
 359
 360         tdb_add_flags(self->ctx, flags);
 361         Py_RETURN_NONE;
 362 }
 363
 364 static PyObject *obj_remove_flags(PyTdbObject *self, PyObject *args)
 365 {
 366         unsigned flags;
 367
 368         PyErr_TDB_RAISE_IF_CLOSED(self);
 369
 370         if (!PyArg_ParseTuple(args, "I", &flags))
 371                 return NULL;
 372
 373         tdb_remove_flags(self->ctx, flags);
 374         Py_RETURN_NONE;
 375 }
 376
 377 typedef struct {
 378         PyObject_HEAD
 379         TDB_DATA current;
 380         PyTdbObject *iteratee;
 381 } PyTdbIteratorObject;
 382
 383 static PyObject *tdb_iter_next(PyTdbIteratorObject *self)
 384 {
 385         TDB_DATA current;
 386         PyObject *ret;
 387         if (self->current.dptr == NULL && self->current.dsize == 0)
 388                 return NULL;
 389         current = self->current;
 390         self->current = tdb_nextkey(self->iteratee->ctx, self->current);
 391         ret = PyString_FromTDB_DATA(current);
 392         return ret;
 393 }
 394
 395 static void tdb_iter_dealloc(PyTdbIteratorObject *self)
 396 {
 397         Py_DECREF(self->iteratee);
 398         PyObject_Del(self);
 399 }
 400
 401 PyTypeObject PyTdbIterator = {
 402         .tp_name = "Iterator",
 403         .tp_basicsize = sizeof(PyTdbIteratorObject),
 404         .tp_iternext = (iternextfunc)tdb_iter_next,
 405         .tp_dealloc = (destructor)tdb_iter_dealloc,
 406         .tp_flags = Py_TPFLAGS_DEFAULT,
 407         .tp_iter = PyObject_SelfIter,
 408 };
 409
 410 static PyObject *tdb_object_iter(PyTdbObject *self)
 411 {
 412         PyTdbIteratorObject *ret;
 413
 414         PyErr_TDB_RAISE_IF_CLOSED(self);
 415
 416         ret = PyObject_New(PyTdbIteratorObject, &PyTdbIterator);
 417         if (!ret)
 418                 return NULL;
 419         ret->current = tdb_firstkey(self->ctx);
 420         ret->iteratee = self;
 421         Py_INCREF(self);
 422         return (PyObject *)ret;
 423 }
 424
 425 static PyObject *obj_clear(PyTdbObject *self)
 426 {
 427         int ret;
 428         PyErr_TDB_RAISE_IF_CLOSED(self);
 429         ret = tdb_wipe_all(self->ctx);
 430         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 431         Py_RETURN_NONE;
 432 }
 433
 434 static PyObject *obj_repack(PyTdbObject *self)
 435 {
 436         int ret;
 437         PyErr_TDB_RAISE_IF_CLOSED(self);
 438         ret = tdb_repack(self->ctx);
 439         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 440         Py_RETURN_NONE;
 441 }
 442
 443 static PyObject *obj_enable_seqnum(PyTdbObject *self)
 444 {
 445         PyErr_TDB_RAISE_IF_CLOSED(self);
 446         tdb_enable_seqnum(self->ctx);
 447         Py_RETURN_NONE;
 448 }
 449
 450 static PyObject *obj_increment_seqnum_nonblock(PyTdbObject *self)
 451 {
 452         PyErr_TDB_RAISE_IF_CLOSED(self);
 453         tdb_increment_seqnum_nonblock(self->ctx);
 454         Py_RETURN_NONE;
 455 }
 456
 457 static PyMethodDef tdb_object_methods[] = {
 458         { "transaction_cancel", (PyCFunction)obj_transaction_cancel, METH_NOARGS,
 459                 "S.transaction_cancel() -> None\n"
 460                 "Cancel the currently active transaction." },
 461         { "transaction_commit", (PyCFunction)obj_transaction_commit, METH_NOARGS,
 462                 "S.transaction_commit() -> None\n"
 463                 "Commit the currently active transaction." },
 464         { "transaction_prepare_commit", (PyCFunction)obj_transaction_prepare_commit, METH_NOARGS,
 465                 "S.transaction_prepare_commit() -> None\n"
 466                 "Prepare to commit the currently active transaction" },
 467         { "transaction_start", (PyCFunction)obj_transaction_start, METH_NOARGS,
 468                 "S.transaction_start() -> None\n"
 469                 "Start a new transaction." },
 470         { "reopen", (PyCFunction)obj_reopen, METH_NOARGS, "Reopen this file." },
 471         { "lock_all", (PyCFunction)obj_lockall, METH_NOARGS, NULL },
 472         { "unlock_all", (PyCFunction)obj_unlockall, METH_NOARGS, NULL },
 473         { "read_lock_all", (PyCFunction)obj_lockall_read, METH_NOARGS, NULL },
 474         { "read_unlock_all", (PyCFunction)obj_unlockall_read, METH_NOARGS, NULL },
 475         { "close", (PyCFunction)obj_close, METH_NOARGS, NULL },
 476         { "get", (PyCFunction)obj_get, METH_VARARGS, "S.get(key) -> value\n"
 477                 "Fetch a value." },
 478         { "append", (PyCFunction)obj_append, METH_VARARGS, "S.append(key, value) -> None\n"
 479                 "Append data to an existing key." },
 480         { "firstkey", (PyCFunction)obj_firstkey, METH_NOARGS, "S.firstkey() -> data\n"
 481                 "Return the first key in this database." },
 482         { "nextkey", (PyCFunction)obj_nextkey, METH_NOARGS, "S.nextkey(key) -> data\n"
 483                 "Return the next key in this database." },
 484         { "delete", (PyCFunction)obj_delete, METH_VARARGS, "S.delete(key) -> None\n"
 485                 "Delete an entry." },
 486         { "has_key", (PyCFunction)obj_has_key, METH_VARARGS, "S.has_key(key) -> None\n"
 487                 "Check whether key exists in this database." },
 488         { "store", (PyCFunction)obj_store, METH_VARARGS, "S.store(key, data, flag=REPLACE) -> None"
 489                 "Store data." },
 490         { "add_flags", (PyCFunction)obj_add_flags, METH_VARARGS, "S.add_flags(flags) -> None" },
 491         { "remove_flags", (PyCFunction)obj_remove_flags, METH_VARARGS, "S.remove_flags(flags) -> None" },
 492         { "iterkeys", (PyCFunction)tdb_object_iter, METH_NOARGS, "S.iterkeys() -> iterator" },
 493         { "clear", (PyCFunction)obj_clear, METH_NOARGS, "S.clear() -> None\n"
 494                 "Wipe the entire database." },
 495         { "repack", (PyCFunction)obj_repack, METH_NOARGS, "S.repack() -> None\n"
 496                 "Repack the entire database." },
 497         { "enable_seqnum", (PyCFunction)obj_enable_seqnum, METH_NOARGS,
 498                 "S.enable_seqnum() -> None" },
 499         { "increment_seqnum_nonblock", (PyCFunction)obj_increment_seqnum_nonblock, METH_NOARGS,
 500                 "S.increment_seqnum_nonblock() -> None" },
 501         { NULL }
 502 };
 503
 504 static PyObject *obj_get_hash_size(PyTdbObject *self, void *closure)
 505 {
 506         PyErr_TDB_RAISE_IF_CLOSED(self);
 507         return PyInt_FromLong(tdb_hash_size(self->ctx));
 508 }
 509
 510 static int obj_set_max_dead(PyTdbObject *self, PyObject *max_dead, void *closure)
 511 {
 512         PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self);
 513         if (!PyInt_Check(max_dead))
 514                 return -1;
 515         tdb_set_max_dead(self->ctx, PyInt_AsLong(max_dead));
 516         return 0;
 517 }
 518
 519 static PyObject *obj_get_map_size(PyTdbObject *self, void *closure)
 520 {
 521         PyErr_TDB_RAISE_IF_CLOSED(self);
 522         return PyInt_FromLong(tdb_map_size(self->ctx));
 523 }
 524
 525 static PyObject *obj_get_freelist_size(PyTdbObject *self, void *closure)
 526 {
 527         PyErr_TDB_RAISE_IF_CLOSED(self);
 528         return PyInt_FromLong(tdb_freelist_size(self->ctx));
 529 }
 530
 531 static PyObject *obj_get_flags(PyTdbObject *self, void *closure)
 532 {
 533         PyErr_TDB_RAISE_IF_CLOSED(self);
 534         return PyInt_FromLong(tdb_get_flags(self->ctx));
 535 }
 536
 537 static PyObject *obj_get_filename(PyTdbObject *self, void *closure)
 538 {
 539         PyErr_TDB_RAISE_IF_CLOSED(self);
 540         return PyString_FromString(tdb_name(self->ctx));
 541 }
 542
 543 static PyObject *obj_get_seqnum(PyTdbObject *self, void *closure)
 544 {
 545         PyErr_TDB_RAISE_IF_CLOSED(self);
 546         return PyInt_FromLong(tdb_get_seqnum(self->ctx));
 547 }
 548
 549
 550 static PyGetSetDef tdb_object_getsetters[] = {
 551         { (char *)"hash_size", (getter)obj_get_hash_size, NULL, NULL },
 552         { (char *)"map_size", (getter)obj_get_map_size, NULL, NULL },
 553         { (char *)"freelist_size", (getter)obj_get_freelist_size, NULL, NULL },
 554         { (char *)"flags", (getter)obj_get_flags, NULL, NULL },
 555         { (char *)"max_dead", NULL, (setter)obj_set_max_dead, NULL },
 556         { (char *)"filename", (getter)obj_get_filename, NULL, (char *)"The filename of this TDB file."},
 557         { (char *)"seqnum", (getter)obj_get_seqnum, NULL, NULL },
 558         { NULL }
 559 };
 560
 561 static PyObject *tdb_object_repr(PyTdbObject *self)
 562 {
 563         PyErr_TDB_RAISE_IF_CLOSED(self);
 564         if (tdb_get_flags(self->ctx) & TDB_INTERNAL) {
 565                 return PyString_FromString("Tdb(<internal>)");
 566         } else {
 567                 return PyString_FromFormat("Tdb('%s')", tdb_name(self->ctx));
 568         }
 569 }
 570
 571 static void tdb_object_dealloc(PyTdbObject *self)
 572 {
 573         if (!self->closed)
 574                 tdb_close(self->ctx);
 575         self->ob_type->tp_free(self);
 576 }
 577
 578 static PyObject *obj_getitem(PyTdbObject *self, PyObject *key)
 579 {
 580         TDB_DATA tkey, val;
 581         PyErr_TDB_RAISE_IF_CLOSED(self);
 582         if (!PyString_Check(key)) {
 583                 PyErr_SetString(PyExc_TypeError, "Expected string as key");
 584                 return NULL;
 585         }
 586
 587         tkey.dptr = (unsigned char *)PyString_AsString(key);
 588         tkey.dsize = PyString_Size(key);
 589
 590         val = tdb_fetch(self->ctx, tkey);
 591         if (val.dptr == NULL) {
 592                 PyErr_SetString(PyExc_KeyError, "No such TDB entry");
 593                 return NULL;
 594         } else {
 595                 return PyString_FromTDB_DATA(val);
 596         }
 597 }
 598
 599 static int obj_setitem(PyTdbObject *self, PyObject *key, PyObject *value)
 600 {
 601         TDB_DATA tkey, tval;
 602         int ret;
 603         PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self);
 604         if (!PyString_Check(key)) {
 605                 PyErr_SetString(PyExc_TypeError, "Expected string as key");
 606                 return -1;
 607         }
 608
 609         tkey = PyString_AsTDB_DATA(key);
 610
 611         if (value == NULL) {
 612                 ret = tdb_delete(self->ctx, tkey);
 613         } else {
 614                 if (!PyString_Check(value)) {
 615                         PyErr_SetString(PyExc_TypeError, "Expected string as value");
 616                         return -1;
 617                 }
 618
 619                 tval = PyString_AsTDB_DATA(value);
 620
 621                 ret = tdb_store(self->ctx, tkey, tval, TDB_REPLACE);
 622         }
 623
 624         if (ret != 0) {
 625                 PyErr_SetTDBError(self->ctx);
 626                 return -1;
 627         }
 628
 629         return ret;
 630 }
 631
 632 static PyMappingMethods tdb_object_mapping = {
 633         .mp_subscript = (binaryfunc)obj_getitem,
 634         .mp_ass_subscript = (objobjargproc)obj_setitem,
 635 };
 636 static PyTypeObject PyTdb = {
 637         .tp_name = "tdb.Tdb",
 638         .tp_basicsize = sizeof(PyTdbObject),
 639         .tp_methods = tdb_object_methods,
 640         .tp_getset = tdb_object_getsetters,
 641         .tp_new = py_tdb_open,
 642         .tp_doc = "A TDB file",
 643         .tp_repr = (reprfunc)tdb_object_repr,
 644         .tp_dealloc = (destructor)tdb_object_dealloc,
 645         .tp_as_mapping = &tdb_object_mapping,
 646         .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_ITER,
 647         .tp_iter = (getiterfunc)tdb_object_iter,
 648 };
 649
 650 static PyMethodDef tdb_methods[] = {
 651         { "open", (PyCFunction)py_tdb_open, METH_VARARGS|METH_KEYWORDS, "open(name, hash_size=0, tdb_flags=TDB_DEFAULT, flags=O_RDWR, mode=0600)\n"
 652                 "Open a TDB file." },
 653         { NULL }
 654 };
 655
 656 void inittdb(void);
 657 void inittdb(void)
 658 {
 659         PyObject *m;
 660
 661         if (PyType_Ready(&PyTdb) < 0)
 662                 return;
 663
 664         if (PyType_Ready(&PyTdbIterator) < 0)
 665                 return;
 666
 667         m = Py_InitModule3("tdb", tdb_methods,
 668                 "simple key-value database that supports multiple writers.");
 669         if (m == NULL)
 670                 return;
 671
 672         PyModule_AddObject(m, "REPLACE", PyInt_FromLong(TDB_REPLACE));
 673         PyModule_AddObject(m, "INSERT", PyInt_FromLong(TDB_INSERT));
 674         PyModule_AddObject(m, "MODIFY", PyInt_FromLong(TDB_MODIFY));
 675
 676         PyModule_AddObject(m, "DEFAULT", PyInt_FromLong(TDB_DEFAULT));
 677         PyModule_AddObject(m, "CLEAR_IF_FIRST", PyInt_FromLong(TDB_CLEAR_IF_FIRST));
 678         PyModule_AddObject(m, "INTERNAL", PyInt_FromLong(TDB_INTERNAL));
 679         PyModule_AddObject(m, "NOLOCK", PyInt_FromLong(TDB_NOLOCK));
 680         PyModule_AddObject(m, "NOMMAP", PyInt_FromLong(TDB_NOMMAP));
 681         PyModule_AddObject(m, "CONVERT", PyInt_FromLong(TDB_CONVERT));
 682         PyModule_AddObject(m, "BIGENDIAN", PyInt_FromLong(TDB_BIGENDIAN));
 683         PyModule_AddObject(m, "NOSYNC", PyInt_FromLong(TDB_NOSYNC));
 684         PyModule_AddObject(m, "SEQNUM", PyInt_FromLong(TDB_SEQNUM));
 685         PyModule_AddObject(m, "VOLATILE", PyInt_FromLong(TDB_VOLATILE));
 686         PyModule_AddObject(m, "ALLOW_NESTING", PyInt_FromLong(TDB_ALLOW_NESTING));
 687         PyModule_AddObject(m, "DISALLOW_NESTING", PyInt_FromLong(TDB_DISALLOW_NESTING));
 688         PyModule_AddObject(m, "INCOMPATIBLE_HASH", PyInt_FromLong(TDB_INCOMPATIBLE_HASH));
 689
 690         PyModule_AddObject(m, "__docformat__", PyString_FromString("restructuredText"));
 691
 692         PyModule_AddObject(m, "__version__", PyString_FromString(PACKAGE_VERSION));
 693
 694         Py_INCREF(&PyTdb);
 695         PyModule_AddObject(m, "Tdb", (PyObject *)&PyTdb);
 696
 697         Py_INCREF(&PyTdbIterator);
 698 }