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         char **kwnames = discard_const_p(char *, _kwnames);
  96
  97         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|siiii", kwnames, &name, &hash_size, &tdb_flags, &flags, &mode))
  98                 return NULL;
  99
 100         if (name == NULL) {
 101                 tdb_flags |= TDB_INTERNAL;
 102         }
 103
 104         ctx = tdb_open(name, hash_size, tdb_flags, flags, mode);
 105         if (ctx == NULL) {
 106                 PyErr_SetFromErrno(PyExc_IOError);
 107                 return NULL;
 108         }
 109
 110         ret = PyObject_New(PyTdbObject, &PyTdb);
 111         if (!ret) {
 112                 tdb_close(ctx);
 113                 return NULL;
 114         }
 115
 116         ret->ctx = ctx;
 117         ret->closed = false;
 118         return (PyObject *)ret;
 119 }
 120
 121 static PyObject *obj_transaction_cancel(PyTdbObject *self)
 122 {
 123         int ret;
 124
 125         PyErr_TDB_RAISE_IF_CLOSED(self);
 126
 127         ret = tdb_transaction_cancel(self->ctx);
 128         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 129         Py_RETURN_NONE;
 130 }
 131
 132 static PyObject *obj_transaction_commit(PyTdbObject *self)
 133 {
 134         int ret;
 135         PyErr_TDB_RAISE_IF_CLOSED(self);
 136         ret = tdb_transaction_commit(self->ctx);
 137         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 138         Py_RETURN_NONE;
 139 }
 140
 141 static PyObject *obj_transaction_prepare_commit(PyTdbObject *self)
 142 {
 143         int ret;
 144         PyErr_TDB_RAISE_IF_CLOSED(self);
 145         ret = tdb_transaction_prepare_commit(self->ctx);
 146         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 147         Py_RETURN_NONE;
 148 }
 149
 150 static PyObject *obj_transaction_start(PyTdbObject *self)
 151 {
 152         int ret;
 153         PyErr_TDB_RAISE_IF_CLOSED(self);
 154         ret = tdb_transaction_start(self->ctx);
 155         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 156         Py_RETURN_NONE;
 157 }
 158
 159 static PyObject *obj_reopen(PyTdbObject *self)
 160 {
 161         int ret;
 162         PyErr_TDB_RAISE_IF_CLOSED(self);
 163         ret = tdb_reopen(self->ctx);
 164         if (ret != 0) {
 165                 self->closed = true;
 166                 PyErr_SetObject(PyExc_RuntimeError,
 167                                 Py_BuildValue("(i,s)",
 168                                               TDB_ERR_IO,
 169                                               "Failed to reopen database"));
 170                 return NULL;
 171         }
 172         Py_RETURN_NONE;
 173 }
 174
 175 static PyObject *obj_lockall(PyTdbObject *self)
 176 {
 177         int ret;
 178         PyErr_TDB_RAISE_IF_CLOSED(self);
 179         ret = tdb_lockall(self->ctx);
 180         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 181         Py_RETURN_NONE;
 182 }
 183
 184 static PyObject *obj_unlockall(PyTdbObject *self)
 185 {
 186         int ret;
 187         PyErr_TDB_RAISE_IF_CLOSED(self);
 188         ret = tdb_unlockall(self->ctx);
 189         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 190         Py_RETURN_NONE;
 191 }
 192
 193 static PyObject *obj_lockall_read(PyTdbObject *self)
 194 {
 195         int ret;
 196         PyErr_TDB_RAISE_IF_CLOSED(self);
 197         ret = tdb_lockall_read(self->ctx);
 198         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 199         Py_RETURN_NONE;
 200 }
 201
 202 static PyObject *obj_unlockall_read(PyTdbObject *self)
 203 {
 204         int ret = tdb_unlockall_read(self->ctx);
 205         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 206         Py_RETURN_NONE;
 207 }
 208
 209 static PyObject *obj_close(PyTdbObject *self)
 210 {
 211         int ret;
 212         if (self->closed)
 213                 Py_RETURN_NONE;
 214         ret = tdb_close(self->ctx);
 215         self->closed = true;
 216         if (ret != 0) {
 217                 PyErr_SetObject(PyExc_RuntimeError,
 218                                 Py_BuildValue("(i,s)",
 219                                               TDB_ERR_IO,
 220                                               "Failed to close database"));
 221                 return NULL;
 222         }
 223         Py_RETURN_NONE;
 224 }
 225
 226 static PyObject *obj_get(PyTdbObject *self, PyObject *args)
 227 {
 228         TDB_DATA key;
 229         PyObject *py_key;
 230
 231         PyErr_TDB_RAISE_IF_CLOSED(self);
 232
 233         if (!PyArg_ParseTuple(args, "O", &py_key))
 234                 return NULL;
 235
 236         key = PyString_AsTDB_DATA(py_key);
 237         if (!key.dptr)
 238                 return NULL;
 239
 240         return PyString_FromTDB_DATA(tdb_fetch(self->ctx, key));
 241 }
 242
 243 static PyObject *obj_append(PyTdbObject *self, PyObject *args)
 244 {
 245         TDB_DATA key, data;
 246         PyObject *py_key, *py_data;
 247         int ret;
 248
 249         PyErr_TDB_RAISE_IF_CLOSED(self);
 250
 251         if (!PyArg_ParseTuple(args, "OO", &py_key, &py_data))
 252                 return NULL;
 253
 254         key = PyString_AsTDB_DATA(py_key);
 255         if (!key.dptr)
 256                 return NULL;
 257         data = PyString_AsTDB_DATA(py_data);
 258         if (!data.dptr)
 259                 return NULL;
 260
 261         ret = tdb_append(self->ctx, key, data);
 262         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 263         Py_RETURN_NONE;
 264 }
 265
 266 static PyObject *obj_firstkey(PyTdbObject *self)
 267 {
 268         PyErr_TDB_RAISE_IF_CLOSED(self);
 269
 270         return PyString_FromTDB_DATA(tdb_firstkey(self->ctx));
 271 }
 272
 273 static PyObject *obj_nextkey(PyTdbObject *self, PyObject *args)
 274 {
 275         TDB_DATA key;
 276         PyObject *py_key;
 277         PyErr_TDB_RAISE_IF_CLOSED(self);
 278
 279         if (!PyArg_ParseTuple(args, "O", &py_key))
 280                 return NULL;
 281
 282         key = PyString_AsTDB_DATA(py_key);
 283         if (!key.dptr)
 284                 return NULL;
 285
 286         return PyString_FromTDB_DATA(tdb_nextkey(self->ctx, key));
 287 }
 288
 289 static PyObject *obj_delete(PyTdbObject *self, PyObject *args)
 290 {
 291         TDB_DATA key;
 292         PyObject *py_key;
 293         int ret;
 294         PyErr_TDB_RAISE_IF_CLOSED(self);
 295
 296         if (!PyArg_ParseTuple(args, "O", &py_key))
 297                 return NULL;
 298
 299         key = PyString_AsTDB_DATA(py_key);
 300         if (!key.dptr)
 301                 return NULL;
 302         ret = tdb_delete(self->ctx, key);
 303         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 304         Py_RETURN_NONE;
 305 }
 306
 307 static PyObject *obj_has_key(PyTdbObject *self, PyObject *args)
 308 {
 309         TDB_DATA key;
 310         int ret;
 311         PyObject *py_key;
 312         PyErr_TDB_RAISE_IF_CLOSED(self);
 313
 314         if (!PyArg_ParseTuple(args, "O", &py_key))
 315                 return NULL;
 316
 317         key = PyString_AsTDB_DATA(py_key);
 318         if (!key.dptr)
 319                 return NULL;
 320         ret = tdb_exists(self->ctx, key);
 321         if (ret != TDB_ERR_NOEXIST) {
 322                 PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 323         }
 324
 325         return (ret == TDB_ERR_NOEXIST)?Py_False:Py_True;
 326 }
 327
 328 static PyObject *obj_store(PyTdbObject *self, PyObject *args)
 329 {
 330         TDB_DATA key, value;
 331         int ret;
 332         int flag = TDB_REPLACE;
 333         PyObject *py_key, *py_value;
 334
 335         PyErr_TDB_RAISE_IF_CLOSED(self);
 336
 337         if (!PyArg_ParseTuple(args, "OO|i", &py_key, &py_value, &flag))
 338                 return NULL;
 339
 340         key = PyString_AsTDB_DATA(py_key);
 341         if (!key.dptr)
 342                 return NULL;
 343         value = PyString_AsTDB_DATA(py_value);
 344         if (!value.dptr)
 345                 return NULL;
 346
 347         ret = tdb_store(self->ctx, key, value, flag);
 348         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 349         Py_RETURN_NONE;
 350 }
 351
 352 static PyObject *obj_add_flags(PyTdbObject *self, PyObject *args)
 353 {
 354         unsigned flags;
 355
 356         PyErr_TDB_RAISE_IF_CLOSED(self);
 357
 358         if (!PyArg_ParseTuple(args, "I", &flags))
 359                 return NULL;
 360
 361         tdb_add_flags(self->ctx, flags);
 362         Py_RETURN_NONE;
 363 }
 364
 365 static PyObject *obj_remove_flags(PyTdbObject *self, PyObject *args)
 366 {
 367         unsigned flags;
 368
 369         PyErr_TDB_RAISE_IF_CLOSED(self);
 370
 371         if (!PyArg_ParseTuple(args, "I", &flags))
 372                 return NULL;
 373
 374         tdb_remove_flags(self->ctx, flags);
 375         Py_RETURN_NONE;
 376 }
 377
 378 typedef struct {
 379         PyObject_HEAD
 380         TDB_DATA current;
 381         PyTdbObject *iteratee;
 382 } PyTdbIteratorObject;
 383
 384 static PyObject *tdb_iter_next(PyTdbIteratorObject *self)
 385 {
 386         TDB_DATA current;
 387         PyObject *ret;
 388         if (self->current.dptr == NULL && self->current.dsize == 0)
 389                 return NULL;
 390         current = self->current;
 391         self->current = tdb_nextkey(self->iteratee->ctx, self->current);
 392         ret = PyString_FromTDB_DATA(current);
 393         return ret;
 394 }
 395
 396 static void tdb_iter_dealloc(PyTdbIteratorObject *self)
 397 {
 398         Py_DECREF(self->iteratee);
 399         PyObject_Del(self);
 400 }
 401
 402 PyTypeObject PyTdbIterator = {
 403         .tp_name = "Iterator",
 404         .tp_basicsize = sizeof(PyTdbIteratorObject),
 405         .tp_iternext = (iternextfunc)tdb_iter_next,
 406         .tp_dealloc = (destructor)tdb_iter_dealloc,
 407         .tp_flags = Py_TPFLAGS_DEFAULT,
 408         .tp_iter = PyObject_SelfIter,
 409 };
 410
 411 static PyObject *tdb_object_iter(PyTdbObject *self)
 412 {
 413         PyTdbIteratorObject *ret;
 414
 415         PyErr_TDB_RAISE_IF_CLOSED(self);
 416
 417         ret = PyObject_New(PyTdbIteratorObject, &PyTdbIterator);
 418         if (!ret)
 419                 return NULL;
 420         ret->current = tdb_firstkey(self->ctx);
 421         ret->iteratee = self;
 422         Py_INCREF(self);
 423         return (PyObject *)ret;
 424 }
 425
 426 static PyObject *obj_clear(PyTdbObject *self)
 427 {
 428         int ret;
 429         PyErr_TDB_RAISE_IF_CLOSED(self);
 430         ret = tdb_wipe_all(self->ctx);
 431         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 432         Py_RETURN_NONE;
 433 }
 434
 435 static PyObject *obj_repack(PyTdbObject *self)
 436 {
 437         int ret;
 438         PyErr_TDB_RAISE_IF_CLOSED(self);
 439         ret = tdb_repack(self->ctx);
 440         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 441         Py_RETURN_NONE;
 442 }
 443
 444 static PyObject *obj_enable_seqnum(PyTdbObject *self)
 445 {
 446         PyErr_TDB_RAISE_IF_CLOSED(self);
 447         tdb_enable_seqnum(self->ctx);
 448         Py_RETURN_NONE;
 449 }
 450
 451 static PyObject *obj_increment_seqnum_nonblock(PyTdbObject *self)
 452 {
 453         PyErr_TDB_RAISE_IF_CLOSED(self);
 454         tdb_increment_seqnum_nonblock(self->ctx);
 455         Py_RETURN_NONE;
 456 }
 457
 458 static PyMethodDef tdb_object_methods[] = {
 459         { "transaction_cancel", (PyCFunction)obj_transaction_cancel, METH_NOARGS,
 460                 "S.transaction_cancel() -> None\n"
 461                 "Cancel the currently active transaction." },
 462         { "transaction_commit", (PyCFunction)obj_transaction_commit, METH_NOARGS,
 463                 "S.transaction_commit() -> None\n"
 464                 "Commit the currently active transaction." },
 465         { "transaction_prepare_commit", (PyCFunction)obj_transaction_prepare_commit, METH_NOARGS,
 466                 "S.transaction_prepare_commit() -> None\n"
 467                 "Prepare to commit the currently active transaction" },
 468         { "transaction_start", (PyCFunction)obj_transaction_start, METH_NOARGS,
 469                 "S.transaction_start() -> None\n"
 470                 "Start a new transaction." },
 471         { "reopen", (PyCFunction)obj_reopen, METH_NOARGS, "Reopen this file." },
 472         { "lock_all", (PyCFunction)obj_lockall, METH_NOARGS, NULL },
 473         { "unlock_all", (PyCFunction)obj_unlockall, METH_NOARGS, NULL },
 474         { "read_lock_all", (PyCFunction)obj_lockall_read, METH_NOARGS, NULL },
 475         { "read_unlock_all", (PyCFunction)obj_unlockall_read, METH_NOARGS, NULL },
 476         { "close", (PyCFunction)obj_close, METH_NOARGS, NULL },
 477         { "get", (PyCFunction)obj_get, METH_VARARGS, "S.get(key) -> value\n"
 478                 "Fetch a value." },
 479         { "append", (PyCFunction)obj_append, METH_VARARGS, "S.append(key, value) -> None\n"
 480                 "Append data to an existing key." },
 481         { "firstkey", (PyCFunction)obj_firstkey, METH_NOARGS, "S.firstkey() -> data\n"
 482                 "Return the first key in this database." },
 483         { "nextkey", (PyCFunction)obj_nextkey, METH_NOARGS, "S.nextkey(key) -> data\n"
 484                 "Return the next key in this database." },
 485         { "delete", (PyCFunction)obj_delete, METH_VARARGS, "S.delete(key) -> None\n"
 486                 "Delete an entry." },
 487         { "has_key", (PyCFunction)obj_has_key, METH_VARARGS, "S.has_key(key) -> None\n"
 488                 "Check whether key exists in this database." },
 489         { "store", (PyCFunction)obj_store, METH_VARARGS, "S.store(key, data, flag=REPLACE) -> None"
 490                 "Store data." },
 491         { "add_flags", (PyCFunction)obj_add_flags, METH_VARARGS, "S.add_flags(flags) -> None" },
 492         { "remove_flags", (PyCFunction)obj_remove_flags, METH_VARARGS, "S.remove_flags(flags) -> None" },
 493         { "iterkeys", (PyCFunction)tdb_object_iter, METH_NOARGS, "S.iterkeys() -> iterator" },
 494         { "clear", (PyCFunction)obj_clear, METH_NOARGS, "S.clear() -> None\n"
 495                 "Wipe the entire database." },
 496         { "repack", (PyCFunction)obj_repack, METH_NOARGS, "S.repack() -> None\n"
 497                 "Repack the entire database." },
 498         { "enable_seqnum", (PyCFunction)obj_enable_seqnum, METH_NOARGS,
 499                 "S.enable_seqnum() -> None" },
 500         { "increment_seqnum_nonblock", (PyCFunction)obj_increment_seqnum_nonblock, METH_NOARGS,
 501                 "S.increment_seqnum_nonblock() -> None" },
 502         { NULL }
 503 };
 504
 505 static PyObject *obj_get_hash_size(PyTdbObject *self, void *closure)
 506 {
 507         PyErr_TDB_RAISE_IF_CLOSED(self);
 508         return PyInt_FromLong(tdb_hash_size(self->ctx));
 509 }
 510
 511 static int obj_set_max_dead(PyTdbObject *self, PyObject *max_dead, void *closure)
 512 {
 513         PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self);
 514         if (!PyInt_Check(max_dead))
 515                 return -1;
 516         tdb_set_max_dead(self->ctx, PyInt_AsLong(max_dead));
 517         return 0;
 518 }
 519
 520 static PyObject *obj_get_map_size(PyTdbObject *self, void *closure)
 521 {
 522         PyErr_TDB_RAISE_IF_CLOSED(self);
 523         return PyInt_FromLong(tdb_map_size(self->ctx));
 524 }
 525
 526 static PyObject *obj_get_freelist_size(PyTdbObject *self, void *closure)
 527 {
 528         PyErr_TDB_RAISE_IF_CLOSED(self);
 529         return PyInt_FromLong(tdb_freelist_size(self->ctx));
 530 }
 531
 532 static PyObject *obj_get_flags(PyTdbObject *self, void *closure)
 533 {
 534         PyErr_TDB_RAISE_IF_CLOSED(self);
 535         return PyInt_FromLong(tdb_get_flags(self->ctx));
 536 }
 537
 538 static PyObject *obj_get_filename(PyTdbObject *self, void *closure)
 539 {
 540         PyErr_TDB_RAISE_IF_CLOSED(self);
 541         return PyString_FromString(tdb_name(self->ctx));
 542 }
 543
 544 static PyObject *obj_get_seqnum(PyTdbObject *self, void *closure)
 545 {
 546         PyErr_TDB_RAISE_IF_CLOSED(self);
 547         return PyInt_FromLong(tdb_get_seqnum(self->ctx));
 548 }
 549
 550
 551 static PyGetSetDef tdb_object_getsetters[] = {
 552         { discard_const_p(char, "hash_size"),
 553           (getter)obj_get_hash_size, NULL, NULL },
 554         { discard_const_p(char, "map_size"),
 555           (getter)obj_get_map_size, NULL, NULL },
 556         { discard_const_p(char, "freelist_size"),
 557           (getter)obj_get_freelist_size, NULL, NULL },
 558         { discard_const_p(char, "flags"),
 559           (getter)obj_get_flags, NULL, NULL },
 560         { discard_const_p(char, "max_dead"),
 561           NULL, (setter)obj_set_max_dead, NULL },
 562         { discard_const_p(char, "filename"),
 563           (getter)obj_get_filename, NULL,
 564           discard_const_p(char, "The filename of this TDB file.") },
 565         { discard_const_p(char, "seqnum"),
 566           (getter)obj_get_seqnum, NULL, NULL },
 567         { NULL }
 568 };
 569
 570 static PyObject *tdb_object_repr(PyTdbObject *self)
 571 {
 572         PyErr_TDB_RAISE_IF_CLOSED(self);
 573         if (tdb_get_flags(self->ctx) & TDB_INTERNAL) {
 574                 return PyString_FromString("Tdb(<internal>)");
 575         } else {
 576                 return PyString_FromFormat("Tdb('%s')", tdb_name(self->ctx));
 577         }
 578 }
 579
 580 static void tdb_object_dealloc(PyTdbObject *self)
 581 {
 582         if (!self->closed)
 583                 tdb_close(self->ctx);
 584         self->ob_type->tp_free(self);
 585 }
 586
 587 static PyObject *obj_getitem(PyTdbObject *self, PyObject *key)
 588 {
 589         TDB_DATA tkey, val;
 590         PyErr_TDB_RAISE_IF_CLOSED(self);
 591         if (!PyString_Check(key)) {
 592                 PyErr_SetString(PyExc_TypeError, "Expected string as key");
 593                 return NULL;
 594         }
 595
 596         tkey.dptr = (unsigned char *)PyString_AsString(key);
 597         tkey.dsize = PyString_Size(key);
 598
 599         val = tdb_fetch(self->ctx, tkey);
 600         if (val.dptr == NULL) {
 601                 PyErr_SetString(PyExc_KeyError, "No such TDB entry");
 602                 return NULL;
 603         } else {
 604                 return PyString_FromTDB_DATA(val);
 605         }
 606 }
 607
 608 static int obj_setitem(PyTdbObject *self, PyObject *key, PyObject *value)
 609 {
 610         TDB_DATA tkey, tval;
 611         int ret;
 612         PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self);
 613         if (!PyString_Check(key)) {
 614                 PyErr_SetString(PyExc_TypeError, "Expected string as key");
 615                 return -1;
 616         }
 617
 618         tkey = PyString_AsTDB_DATA(key);
 619
 620         if (value == NULL) {
 621                 ret = tdb_delete(self->ctx, tkey);
 622         } else {
 623                 if (!PyString_Check(value)) {
 624                         PyErr_SetString(PyExc_TypeError, "Expected string as value");
 625                         return -1;
 626                 }
 627
 628                 tval = PyString_AsTDB_DATA(value);
 629
 630                 ret = tdb_store(self->ctx, tkey, tval, TDB_REPLACE);
 631         }
 632
 633         if (ret != 0) {
 634                 PyErr_SetTDBError(self->ctx);
 635                 return -1;
 636         }
 637
 638         return ret;
 639 }
 640
 641 static PyMappingMethods tdb_object_mapping = {
 642         .mp_subscript = (binaryfunc)obj_getitem,
 643         .mp_ass_subscript = (objobjargproc)obj_setitem,
 644 };
 645 static PyTypeObject PyTdb = {
 646         .tp_name = "tdb.Tdb",
 647         .tp_basicsize = sizeof(PyTdbObject),
 648         .tp_methods = tdb_object_methods,
 649         .tp_getset = tdb_object_getsetters,
 650         .tp_new = py_tdb_open,
 651         .tp_doc = "A TDB file",
 652         .tp_repr = (reprfunc)tdb_object_repr,
 653         .tp_dealloc = (destructor)tdb_object_dealloc,
 654         .tp_as_mapping = &tdb_object_mapping,
 655         .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_ITER,
 656         .tp_iter = (getiterfunc)tdb_object_iter,
 657 };
 658
 659 static PyMethodDef tdb_methods[] = {
 660         { "open", (PyCFunction)py_tdb_open, METH_VARARGS|METH_KEYWORDS, "open(name, hash_size=0, tdb_flags=TDB_DEFAULT, flags=O_RDWR, mode=0600)\n"
 661                 "Open a TDB file." },
 662         { NULL }
 663 };
 664
 665 void inittdb(void);
 666 void inittdb(void)
 667 {
 668         PyObject *m;
 669
 670         if (PyType_Ready(&PyTdb) < 0)
 671                 return;
 672
 673         if (PyType_Ready(&PyTdbIterator) < 0)
 674                 return;
 675
 676         m = Py_InitModule3("tdb", tdb_methods,
 677                 "simple key-value database that supports multiple writers.");
 678         if (m == NULL)
 679                 return;
 680
 681         PyModule_AddObject(m, "REPLACE", PyInt_FromLong(TDB_REPLACE));
 682         PyModule_AddObject(m, "INSERT", PyInt_FromLong(TDB_INSERT));
 683         PyModule_AddObject(m, "MODIFY", PyInt_FromLong(TDB_MODIFY));
 684
 685         PyModule_AddObject(m, "DEFAULT", PyInt_FromLong(TDB_DEFAULT));
 686         PyModule_AddObject(m, "CLEAR_IF_FIRST", PyInt_FromLong(TDB_CLEAR_IF_FIRST));
 687         PyModule_AddObject(m, "INTERNAL", PyInt_FromLong(TDB_INTERNAL));
 688         PyModule_AddObject(m, "NOLOCK", PyInt_FromLong(TDB_NOLOCK));
 689         PyModule_AddObject(m, "NOMMAP", PyInt_FromLong(TDB_NOMMAP));
 690         PyModule_AddObject(m, "CONVERT", PyInt_FromLong(TDB_CONVERT));
 691         PyModule_AddObject(m, "BIGENDIAN", PyInt_FromLong(TDB_BIGENDIAN));
 692         PyModule_AddObject(m, "NOSYNC", PyInt_FromLong(TDB_NOSYNC));
 693         PyModule_AddObject(m, "SEQNUM", PyInt_FromLong(TDB_SEQNUM));
 694         PyModule_AddObject(m, "VOLATILE", PyInt_FromLong(TDB_VOLATILE));
 695         PyModule_AddObject(m, "ALLOW_NESTING", PyInt_FromLong(TDB_ALLOW_NESTING));
 696         PyModule_AddObject(m, "DISALLOW_NESTING", PyInt_FromLong(TDB_DISALLOW_NESTING));
 697         PyModule_AddObject(m, "INCOMPATIBLE_HASH", PyInt_FromLong(TDB_INCOMPATIBLE_HASH));
 698
 699         PyModule_AddObject(m, "__docformat__", PyString_FromString("restructuredText"));
 700
 701         PyModule_AddObject(m, "__version__", PyString_FromString(PACKAGE_VERSION));
 702
 703         Py_INCREF(&PyTdb);
 704         PyModule_AddObject(m, "Tdb", (PyObject *)&PyTdb);
 705
 706         Py_INCREF(&PyTdbIterator);
 707 }