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