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