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