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 #if PY_MAJOR_VERSION >= 3
  35 #define PyInt_FromLong PyLong_FromLong
  36 #define PyInt_Check PyLong_Check
  37 #define PyInt_AsLong PyLong_AsLong
  38 #define Py_TPFLAGS_HAVE_ITER 0
  39 #endif
  40
  41 /* discard signature of 'func' in favour of 'target_sig' */
  42 #define PY_DISCARD_FUNC_SIG(target_sig, func) (target_sig)(void(*)(void))func
  43
  44 typedef struct {
  45         PyObject_HEAD
  46         TDB_CONTEXT *ctx;
  47         bool closed;
  48 } PyTdbObject;
  49
  50 static PyTypeObject PyTdb;
  51
  52 static void PyErr_SetTDBError(TDB_CONTEXT *tdb)
  53 {
  54         PyErr_SetObject(PyExc_RuntimeError,
  55                 Py_BuildValue("(i,s)", tdb_error(tdb), tdb_errorstr(tdb)));
  56 }
  57
  58 static TDB_DATA PyBytes_AsTDB_DATA(PyObject *data)
  59 {
  60         TDB_DATA ret;
  61         ret.dptr = (unsigned char *)PyBytes_AsString(data);
  62         ret.dsize = PyBytes_Size(data);
  63         return ret;
  64 }
  65
  66 static PyObject *PyBytes_FromTDB_DATA(TDB_DATA data)
  67 {
  68         if (data.dptr == NULL && data.dsize == 0) {
  69                 Py_RETURN_NONE;
  70         } else {
  71                 PyObject *ret = PyBytes_FromStringAndSize((const char *)data.dptr,
  72                                                                                                   data.dsize);
  73                 free(data.dptr);
  74                 return ret;
  75     }
  76 }
  77
  78 #define PyErr_TDB_ERROR_IS_ERR_RAISE(ret, tdb) \
  79         if (ret != 0) { \
  80                 PyErr_SetTDBError(tdb); \
  81                 return NULL; \
  82         }
  83
  84 #define PyErr_TDB_RAISE_IF_CLOSED(self) \
  85         if (self->closed) {                                             \
  86                 PyErr_SetObject(PyExc_RuntimeError,                             \
  87                                 Py_BuildValue("(i,s)", TDB_ERR_IO, "Database is already closed")); \
  88                 return NULL;                                            \
  89         }
  90
  91 #define PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self) \
  92         if (self->closed) {                                             \
  93                 PyErr_SetObject(PyExc_RuntimeError,                             \
  94                                 Py_BuildValue("(i,s)", TDB_ERR_IO, "Database is already closed")); \
  95                 return -1;                                              \
  96         }
  97
  98 static PyObject *py_tdb_open(PyTypeObject *type, PyObject *args, PyObject *kwargs)
  99 {
 100         char *name = NULL;
 101         int hash_size = 0, tdb_flags = TDB_DEFAULT, flags = O_RDWR, mode = 0600;
 102         TDB_CONTEXT *ctx;
 103         PyTdbObject *ret;
 104         const char *_kwnames[] = { "name", "hash_size", "tdb_flags", "flags", "mode", NULL };
 105         char **kwnames = discard_const_p(char *, _kwnames);
 106
 107         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|siiii", kwnames, &name, &hash_size, &tdb_flags, &flags, &mode))
 108                 return NULL;
 109
 110         if (name == NULL) {
 111                 tdb_flags |= TDB_INTERNAL;
 112         }
 113
 114         ctx = tdb_open(name, hash_size, tdb_flags, flags, mode);
 115         if (ctx == NULL) {
 116                 PyErr_SetFromErrno(PyExc_IOError);
 117                 return NULL;
 118         }
 119
 120         ret = PyObject_New(PyTdbObject, &PyTdb);
 121         if (!ret) {
 122                 tdb_close(ctx);
 123                 return NULL;
 124         }
 125
 126         ret->ctx = ctx;
 127         ret->closed = false;
 128         return (PyObject *)ret;
 129 }
 130
 131 static PyObject *obj_transaction_cancel(PyTdbObject *self,
 132                 PyObject *Py_UNUSED(ignored))
 133 {
 134         int ret;
 135
 136         PyErr_TDB_RAISE_IF_CLOSED(self);
 137
 138         ret = tdb_transaction_cancel(self->ctx);
 139         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 140         Py_RETURN_NONE;
 141 }
 142
 143 static PyObject *obj_transaction_commit(PyTdbObject *self,
 144                 PyObject *Py_UNUSED(ignored))
 145 {
 146         int ret;
 147         PyErr_TDB_RAISE_IF_CLOSED(self);
 148         ret = tdb_transaction_commit(self->ctx);
 149         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 150         Py_RETURN_NONE;
 151 }
 152
 153 static PyObject *obj_transaction_prepare_commit(PyTdbObject *self,
 154                 PyObject *Py_UNUSED(ignored))
 155 {
 156         int ret;
 157         PyErr_TDB_RAISE_IF_CLOSED(self);
 158         ret = tdb_transaction_prepare_commit(self->ctx);
 159         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 160         Py_RETURN_NONE;
 161 }
 162
 163 static PyObject *obj_transaction_start(PyTdbObject *self,
 164                 PyObject *Py_UNUSED(ignored))
 165 {
 166         int ret;
 167         PyErr_TDB_RAISE_IF_CLOSED(self);
 168         ret = tdb_transaction_start(self->ctx);
 169         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 170         Py_RETURN_NONE;
 171 }
 172
 173 static PyObject *obj_reopen(PyTdbObject *self,
 174                 PyObject *Py_UNUSED(ignored))
 175 {
 176         int ret;
 177         PyErr_TDB_RAISE_IF_CLOSED(self);
 178         ret = tdb_reopen(self->ctx);
 179         if (ret != 0) {
 180                 self->closed = true;
 181                 PyErr_SetObject(PyExc_RuntimeError,
 182                                 Py_BuildValue("(i,s)",
 183                                               TDB_ERR_IO,
 184                                               "Failed to reopen database"));
 185                 return NULL;
 186         }
 187         Py_RETURN_NONE;
 188 }
 189
 190 static PyObject *obj_lockall(PyTdbObject *self,
 191                 PyObject *Py_UNUSED(ignored))
 192 {
 193         int ret;
 194         PyErr_TDB_RAISE_IF_CLOSED(self);
 195         ret = tdb_lockall(self->ctx);
 196         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 197         Py_RETURN_NONE;
 198 }
 199
 200 static PyObject *obj_unlockall(PyTdbObject *self,
 201                 PyObject *Py_UNUSED(ignored))
 202 {
 203         int ret;
 204         PyErr_TDB_RAISE_IF_CLOSED(self);
 205         ret = tdb_unlockall(self->ctx);
 206         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 207         Py_RETURN_NONE;
 208 }
 209
 210 static PyObject *obj_lockall_read(PyTdbObject *self,
 211                 PyObject *Py_UNUSED(ignored))
 212 {
 213         int ret;
 214         PyErr_TDB_RAISE_IF_CLOSED(self);
 215         ret = tdb_lockall_read(self->ctx);
 216         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 217         Py_RETURN_NONE;
 218 }
 219
 220 static PyObject *obj_unlockall_read(PyTdbObject *self,
 221                 PyObject *Py_UNUSED(ignored))
 222 {
 223         int ret = tdb_unlockall_read(self->ctx);
 224         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 225         Py_RETURN_NONE;
 226 }
 227
 228 static PyObject *obj_close(PyTdbObject *self, PyObject *Py_UNUSED(ignored))
 229 {
 230         int ret;
 231         if (self->closed)
 232                 Py_RETURN_NONE;
 233         ret = tdb_close(self->ctx);
 234         self->closed = true;
 235         if (ret != 0) {
 236                 PyErr_SetObject(PyExc_RuntimeError,
 237                                 Py_BuildValue("(i,s)",
 238                                               TDB_ERR_IO,
 239                                               "Failed to close database"));
 240                 return NULL;
 241         }
 242         Py_RETURN_NONE;
 243 }
 244
 245 static PyObject *obj_get(PyTdbObject *self, PyObject *args)
 246 {
 247         TDB_DATA key;
 248         PyObject *py_key;
 249
 250         PyErr_TDB_RAISE_IF_CLOSED(self);
 251
 252         if (!PyArg_ParseTuple(args, "O", &py_key))
 253                 return NULL;
 254
 255         key = PyBytes_AsTDB_DATA(py_key);
 256         if (!key.dptr)
 257                 return NULL;
 258
 259         return PyBytes_FromTDB_DATA(tdb_fetch(self->ctx, key));
 260 }
 261
 262 static PyObject *obj_append(PyTdbObject *self, PyObject *args)
 263 {
 264         TDB_DATA key, data;
 265         PyObject *py_key, *py_data;
 266         int ret;
 267
 268         PyErr_TDB_RAISE_IF_CLOSED(self);
 269
 270         if (!PyArg_ParseTuple(args, "OO", &py_key, &py_data))
 271                 return NULL;
 272
 273         key = PyBytes_AsTDB_DATA(py_key);
 274         if (!key.dptr)
 275                 return NULL;
 276         data = PyBytes_AsTDB_DATA(py_data);
 277         if (!data.dptr)
 278                 return NULL;
 279
 280         ret = tdb_append(self->ctx, key, data);
 281         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 282         Py_RETURN_NONE;
 283 }
 284
 285 static PyObject *obj_firstkey(PyTdbObject *self, PyObject *Py_UNUSED(ignored))
 286 {
 287         PyErr_TDB_RAISE_IF_CLOSED(self);
 288
 289         return PyBytes_FromTDB_DATA(tdb_firstkey(self->ctx));
 290 }
 291
 292 static PyObject *obj_nextkey(PyTdbObject *self, PyObject *args)
 293 {
 294         TDB_DATA key;
 295         PyObject *py_key;
 296         PyErr_TDB_RAISE_IF_CLOSED(self);
 297
 298         if (!PyArg_ParseTuple(args, "O", &py_key))
 299                 return NULL;
 300
 301         key = PyBytes_AsTDB_DATA(py_key);
 302         if (!key.dptr)
 303                 return NULL;
 304
 305         return PyBytes_FromTDB_DATA(tdb_nextkey(self->ctx, key));
 306 }
 307
 308 static PyObject *obj_delete(PyTdbObject *self, PyObject *args)
 309 {
 310         TDB_DATA key;
 311         PyObject *py_key;
 312         int ret;
 313         PyErr_TDB_RAISE_IF_CLOSED(self);
 314
 315         if (!PyArg_ParseTuple(args, "O", &py_key))
 316                 return NULL;
 317
 318         key = PyBytes_AsTDB_DATA(py_key);
 319         if (!key.dptr)
 320                 return NULL;
 321         ret = tdb_delete(self->ctx, key);
 322         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 323         Py_RETURN_NONE;
 324 }
 325
 326 static int obj_contains(PyTdbObject *self, PyObject *py_key)
 327 {
 328         TDB_DATA key;
 329         int ret;
 330         PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self);
 331
 332         key = PyBytes_AsTDB_DATA(py_key);
 333         if (!key.dptr) {
 334                 PyErr_BadArgument();
 335                 return -1;
 336         }
 337         ret = tdb_exists(self->ctx, key);
 338         if (ret)
 339                 return 1;
 340         return 0;
 341 }
 342
 343 #if PY_MAJOR_VERSION < 3
 344 static PyObject *obj_has_key(PyTdbObject *self, PyObject *args)
 345 {
 346         int ret;
 347         PyObject *py_key;
 348         PyErr_TDB_RAISE_IF_CLOSED(self);
 349
 350         if (!PyArg_ParseTuple(args, "O", &py_key))
 351                 return NULL;
 352
 353         ret = obj_contains(self, py_key);
 354         if (ret == -1)
 355                 return NULL;
 356         if (ret)
 357                 Py_RETURN_TRUE;
 358         Py_RETURN_FALSE;
 359
 360 }
 361 #endif
 362
 363 static PyObject *obj_store(PyTdbObject *self, PyObject *args)
 364 {
 365         TDB_DATA key, value;
 366         int ret;
 367         int flag = TDB_REPLACE;
 368         PyObject *py_key, *py_value;
 369
 370         PyErr_TDB_RAISE_IF_CLOSED(self);
 371
 372         if (!PyArg_ParseTuple(args, "OO|i", &py_key, &py_value, &flag))
 373                 return NULL;
 374
 375         key = PyBytes_AsTDB_DATA(py_key);
 376         if (!key.dptr)
 377                 return NULL;
 378         value = PyBytes_AsTDB_DATA(py_value);
 379         if (!value.dptr)
 380                 return NULL;
 381
 382         ret = tdb_store(self->ctx, key, value, flag);
 383         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 384         Py_RETURN_NONE;
 385 }
 386
 387 static PyObject *obj_add_flags(PyTdbObject *self, PyObject *args)
 388 {
 389         unsigned flags;
 390
 391         PyErr_TDB_RAISE_IF_CLOSED(self);
 392
 393         if (!PyArg_ParseTuple(args, "I", &flags))
 394                 return NULL;
 395
 396         tdb_add_flags(self->ctx, flags);
 397         Py_RETURN_NONE;
 398 }
 399
 400 static PyObject *obj_remove_flags(PyTdbObject *self, PyObject *args)
 401 {
 402         unsigned flags;
 403
 404         PyErr_TDB_RAISE_IF_CLOSED(self);
 405
 406         if (!PyArg_ParseTuple(args, "I", &flags))
 407                 return NULL;
 408
 409         tdb_remove_flags(self->ctx, flags);
 410         Py_RETURN_NONE;
 411 }
 412
 413 typedef struct {
 414         PyObject_HEAD
 415         TDB_DATA current;
 416         PyTdbObject *iteratee;
 417 } PyTdbIteratorObject;
 418
 419 static PyObject *tdb_iter_next(PyTdbIteratorObject *self)
 420 {
 421         TDB_DATA current;
 422         PyObject *ret;
 423         if (self->current.dptr == NULL && self->current.dsize == 0)
 424                 return NULL;
 425         current = self->current;
 426         self->current = tdb_nextkey(self->iteratee->ctx, self->current);
 427         ret = PyBytes_FromTDB_DATA(current);
 428         return ret;
 429 }
 430
 431 static void tdb_iter_dealloc(PyTdbIteratorObject *self)
 432 {
 433         Py_DECREF(self->iteratee);
 434         PyObject_Del(self);
 435 }
 436
 437 PyTypeObject PyTdbIterator = {
 438         .tp_name = "Iterator",
 439         .tp_basicsize = sizeof(PyTdbIteratorObject),
 440         .tp_iternext = (iternextfunc)tdb_iter_next,
 441         .tp_dealloc = (destructor)tdb_iter_dealloc,
 442         .tp_flags = Py_TPFLAGS_DEFAULT,
 443         .tp_iter = PyObject_SelfIter,
 444 };
 445
 446 static PyObject *tdb_object_iter(PyTdbObject *self,
 447                 PyObject *Py_UNUSED(ignored))
 448 {
 449         PyTdbIteratorObject *ret;
 450
 451         PyErr_TDB_RAISE_IF_CLOSED(self);
 452
 453         ret = PyObject_New(PyTdbIteratorObject, &PyTdbIterator);
 454         if (!ret)
 455                 return NULL;
 456         ret->current = tdb_firstkey(self->ctx);
 457         ret->iteratee = self;
 458         Py_INCREF(self);
 459         return (PyObject *)ret;
 460 }
 461
 462 static PyObject *obj_clear(PyTdbObject *self, PyObject *Py_UNUSED(ignored))
 463 {
 464         int ret;
 465         PyErr_TDB_RAISE_IF_CLOSED(self);
 466         ret = tdb_wipe_all(self->ctx);
 467         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 468         Py_RETURN_NONE;
 469 }
 470
 471 static PyObject *obj_repack(PyTdbObject *self, PyObject *Py_UNUSED(ignored))
 472 {
 473         int ret;
 474         PyErr_TDB_RAISE_IF_CLOSED(self);
 475         ret = tdb_repack(self->ctx);
 476         PyErr_TDB_ERROR_IS_ERR_RAISE(ret, self->ctx);
 477         Py_RETURN_NONE;
 478 }
 479
 480 static PyObject *obj_enable_seqnum(PyTdbObject *self,
 481                 PyObject *Py_UNUSED(ignored))
 482 {
 483         PyErr_TDB_RAISE_IF_CLOSED(self);
 484         tdb_enable_seqnum(self->ctx);
 485         Py_RETURN_NONE;
 486 }
 487
 488 static PyObject *obj_increment_seqnum_nonblock(PyTdbObject *self,
 489                 PyObject *Py_UNUSED(ignored))
 490 {
 491         PyErr_TDB_RAISE_IF_CLOSED(self);
 492         tdb_increment_seqnum_nonblock(self->ctx);
 493         Py_RETURN_NONE;
 494 }
 495
 496 static PyMethodDef tdb_object_methods[] = {
 497         { "transaction_cancel", (PyCFunction)obj_transaction_cancel, METH_NOARGS,
 498                 "S.transaction_cancel() -> None\n"
 499                 "Cancel the currently active transaction." },
 500         { "transaction_commit", (PyCFunction)obj_transaction_commit, METH_NOARGS,
 501                 "S.transaction_commit() -> None\n"
 502                 "Commit the currently active transaction." },
 503         { "transaction_prepare_commit", (PyCFunction)obj_transaction_prepare_commit, METH_NOARGS,
 504                 "S.transaction_prepare_commit() -> None\n"
 505                 "Prepare to commit the currently active transaction" },
 506         { "transaction_start", (PyCFunction)obj_transaction_start, METH_NOARGS,
 507                 "S.transaction_start() -> None\n"
 508                 "Start a new transaction." },
 509         { "reopen", (PyCFunction)obj_reopen, METH_NOARGS, "Reopen this file." },
 510         { "lock_all", (PyCFunction)obj_lockall, METH_NOARGS, NULL },
 511         { "unlock_all", (PyCFunction)obj_unlockall, METH_NOARGS, NULL },
 512         { "read_lock_all", (PyCFunction)obj_lockall_read, METH_NOARGS, NULL },
 513         { "read_unlock_all", (PyCFunction)obj_unlockall_read, METH_NOARGS, NULL },
 514         { "close", (PyCFunction)obj_close, METH_NOARGS, NULL },
 515         { "get", (PyCFunction)obj_get, METH_VARARGS, "S.get(key) -> value\n"
 516                 "Fetch a value." },
 517         { "append", (PyCFunction)obj_append, METH_VARARGS, "S.append(key, value) -> None\n"
 518                 "Append data to an existing key." },
 519         { "firstkey", (PyCFunction)obj_firstkey, METH_NOARGS, "S.firstkey() -> data\n"
 520                 "Return the first key in this database." },
 521         { "nextkey", (PyCFunction)obj_nextkey, METH_VARARGS, "S.nextkey(key) -> data\n"
 522                 "Return the next key in this database." },
 523         { "delete", (PyCFunction)obj_delete, METH_VARARGS, "S.delete(key) -> None\n"
 524                 "Delete an entry." },
 525 #if PY_MAJOR_VERSION < 3
 526         { "has_key", (PyCFunction)obj_has_key, METH_VARARGS, "S.has_key(key) -> None\n"
 527                 "Check whether key exists in this database." },
 528 #endif
 529         { "store", (PyCFunction)obj_store, METH_VARARGS, "S.store(key, data, flag=REPLACE) -> None"
 530                 "Store data." },
 531         { "add_flags", (PyCFunction)obj_add_flags, METH_VARARGS, "S.add_flags(flags) -> None" },
 532         { "remove_flags", (PyCFunction)obj_remove_flags, METH_VARARGS, "S.remove_flags(flags) -> None" },
 533 #if PY_MAJOR_VERSION >= 3
 534         { "keys", (PyCFunction)tdb_object_iter, METH_NOARGS, "S.iterkeys() -> iterator" },
 535 #else
 536         { "iterkeys", (PyCFunction)tdb_object_iter, METH_NOARGS, "S.iterkeys() -> iterator" },
 537 #endif
 538         { "clear", (PyCFunction)obj_clear, METH_NOARGS, "S.clear() -> None\n"
 539                 "Wipe the entire database." },
 540         { "repack", (PyCFunction)obj_repack, METH_NOARGS, "S.repack() -> None\n"
 541                 "Repack the entire database." },
 542         { "enable_seqnum", (PyCFunction)obj_enable_seqnum, METH_NOARGS,
 543                 "S.enable_seqnum() -> None" },
 544         { "increment_seqnum_nonblock", (PyCFunction)obj_increment_seqnum_nonblock, METH_NOARGS,
 545                 "S.increment_seqnum_nonblock() -> None" },
 546         { NULL }
 547 };
 548
 549 static PyObject *obj_get_hash_size(PyTdbObject *self, void *closure)
 550 {
 551         PyErr_TDB_RAISE_IF_CLOSED(self);
 552         return PyInt_FromLong(tdb_hash_size(self->ctx));
 553 }
 554
 555 static int obj_set_max_dead(PyTdbObject *self, PyObject *max_dead, void *closure)
 556 {
 557         PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self);
 558         if (!PyInt_Check(max_dead))
 559                 return -1;
 560         tdb_set_max_dead(self->ctx, PyInt_AsLong(max_dead));
 561         return 0;
 562 }
 563
 564 static PyObject *obj_get_map_size(PyTdbObject *self, void *closure)
 565 {
 566         PyErr_TDB_RAISE_IF_CLOSED(self);
 567         return PyInt_FromLong(tdb_map_size(self->ctx));
 568 }
 569
 570 static PyObject *obj_get_freelist_size(PyTdbObject *self, void *closure)
 571 {
 572         PyErr_TDB_RAISE_IF_CLOSED(self);
 573         return PyInt_FromLong(tdb_freelist_size(self->ctx));
 574 }
 575
 576 static PyObject *obj_get_flags(PyTdbObject *self, void *closure)
 577 {
 578         PyErr_TDB_RAISE_IF_CLOSED(self);
 579         return PyInt_FromLong(tdb_get_flags(self->ctx));
 580 }
 581
 582 static PyObject *obj_get_filename(PyTdbObject *self, void *closure)
 583 {
 584         PyErr_TDB_RAISE_IF_CLOSED(self);
 585         return PyBytes_FromString(tdb_name(self->ctx));
 586 }
 587
 588 static PyObject *obj_get_seqnum(PyTdbObject *self, void *closure)
 589 {
 590         PyErr_TDB_RAISE_IF_CLOSED(self);
 591         return PyInt_FromLong(tdb_get_seqnum(self->ctx));
 592 }
 593
 594 static PyObject *obj_get_text(PyTdbObject *self, void *closure)
 595 {
 596         PyObject *mod, *cls, *inst;
 597         mod = PyImport_ImportModule("_tdb_text");
 598         if (mod == NULL)
 599                 return NULL;
 600         cls = PyObject_GetAttrString(mod, "TdbTextWrapper");
 601         if (cls == NULL) {
 602                 Py_DECREF(mod);
 603                 return NULL;
 604         }
 605         inst = PyObject_CallFunction(cls, discard_const_p(char, "O"), self);
 606         Py_DECREF(mod);
 607         Py_DECREF(cls);
 608         return inst;
 609 }
 610
 611 static PyGetSetDef tdb_object_getsetters[] = {
 612         {
 613                 .name    = discard_const_p(char, "hash_size"),
 614                 .get     = (getter)obj_get_hash_size,
 615         },
 616         {
 617                 .name    = discard_const_p(char, "map_size"),
 618                 .get     = (getter)obj_get_map_size,
 619         },
 620         {
 621                 .name    = discard_const_p(char, "freelist_size"),
 622                 .get     = (getter)obj_get_freelist_size,
 623         },
 624         {
 625                 .name    = discard_const_p(char, "flags"),
 626                 .get     = (getter)obj_get_flags,
 627         },
 628         {
 629                 .name    = discard_const_p(char, "max_dead"),
 630                 .set     = (setter)obj_set_max_dead,
 631         },
 632         {
 633                 .name    = discard_const_p(char, "filename"),
 634                 .get     = (getter)obj_get_filename,
 635                 .doc     = discard_const_p(char, "The filename of this TDB file."),
 636         },
 637         {
 638                 .name    = discard_const_p(char, "seqnum"),
 639                 .get     = (getter)obj_get_seqnum,
 640         },
 641         {
 642                 .name    = discard_const_p(char, "text"),
 643                 .get     = (getter)obj_get_text,
 644         },
 645         { .name = NULL }
 646 };
 647
 648 static PyObject *tdb_object_repr(PyTdbObject *self)
 649 {
 650         PyErr_TDB_RAISE_IF_CLOSED(self);
 651         if (tdb_get_flags(self->ctx) & TDB_INTERNAL) {
 652                 return PyUnicode_FromString("Tdb(<internal>)");
 653         } else {
 654                 return PyUnicode_FromFormat("Tdb('%s')", tdb_name(self->ctx));
 655         }
 656 }
 657
 658 static void tdb_object_dealloc(PyTdbObject *self)
 659 {
 660         if (!self->closed)
 661                 tdb_close(self->ctx);
 662         Py_TYPE(self)->tp_free(self);
 663 }
 664
 665 static PyObject *obj_getitem(PyTdbObject *self, PyObject *key)
 666 {
 667         TDB_DATA tkey, val;
 668         PyErr_TDB_RAISE_IF_CLOSED(self);
 669         if (!PyBytes_Check(key)) {
 670                 PyErr_SetString(PyExc_TypeError, "Expected bytestring as key");
 671                 return NULL;
 672         }
 673
 674         tkey.dptr = (unsigned char *)PyBytes_AsString(key);
 675         tkey.dsize = PyBytes_Size(key);
 676
 677         val = tdb_fetch(self->ctx, tkey);
 678         if (val.dptr == NULL) {
 679                 /*
 680                  * if the key doesn't exist raise KeyError(key) to be
 681                  * consistent with python dict
 682                  */
 683                 PyErr_SetObject(PyExc_KeyError, key);
 684                 return NULL;
 685         } else {
 686                 return PyBytes_FromTDB_DATA(val);
 687         }
 688 }
 689
 690 static int obj_setitem(PyTdbObject *self, PyObject *key, PyObject *value)
 691 {
 692         TDB_DATA tkey, tval;
 693         int ret;
 694         PyErr_TDB_RAISE_RETURN_MINUS_1_IF_CLOSED(self);
 695         if (!PyBytes_Check(key)) {
 696                 PyErr_SetString(PyExc_TypeError, "Expected bytestring as key");
 697                 return -1;
 698         }
 699
 700         tkey = PyBytes_AsTDB_DATA(key);
 701
 702         if (value == NULL) {
 703                 ret = tdb_delete(self->ctx, tkey);
 704         } else {
 705                 if (!PyBytes_Check(value)) {
 706                         PyErr_SetString(PyExc_TypeError, "Expected string as value");
 707                         return -1;
 708                 }
 709
 710                 tval = PyBytes_AsTDB_DATA(value);
 711
 712                 ret = tdb_store(self->ctx, tkey, tval, TDB_REPLACE);
 713         }
 714
 715         if (ret != 0) {
 716                 PyErr_SetTDBError(self->ctx);
 717                 return -1;
 718         }
 719
 720         return ret;
 721 }
 722
 723 static PyMappingMethods tdb_object_mapping = {
 724         .mp_subscript = (binaryfunc)obj_getitem,
 725         .mp_ass_subscript = (objobjargproc)obj_setitem,
 726 };
 727 static PySequenceMethods tdb_object_seq = {
 728         .sq_contains = (objobjproc)obj_contains,
 729 };
 730 static PyTypeObject PyTdb = {
 731         .tp_name = "tdb.Tdb",
 732         .tp_basicsize = sizeof(PyTdbObject),
 733         .tp_methods = tdb_object_methods,
 734         .tp_getset = tdb_object_getsetters,
 735         .tp_new = py_tdb_open,
 736         .tp_doc = "A TDB file",
 737         .tp_repr = (reprfunc)tdb_object_repr,
 738         .tp_dealloc = (destructor)tdb_object_dealloc,
 739         .tp_as_mapping = &tdb_object_mapping,
 740         .tp_as_sequence = &tdb_object_seq,
 741         .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_ITER,
 742         .tp_iter = PY_DISCARD_FUNC_SIG(getiterfunc,tdb_object_iter),
 743 };
 744
 745 static PyMethodDef tdb_methods[] = {
 746         {
 747                 .ml_name  = "open",
 748                 .ml_meth  = PY_DISCARD_FUNC_SIG(PyCFunction, py_tdb_open),
 749                 .ml_flags = METH_VARARGS|METH_KEYWORDS,
 750                 .ml_doc   = "open(name, hash_size=0, tdb_flags=TDB_DEFAULT, "
 751                             "flags=O_RDWR, mode=0600)\nOpen a TDB file."
 752         },
 753         { .ml_name = NULL }
 754 };
 755
 756 #define MODULE_DOC "simple key-value database that supports multiple writers."
 757
 758 #if PY_MAJOR_VERSION >= 3
 759 static struct PyModuleDef moduledef = {
 760     PyModuleDef_HEAD_INIT,
 761     .m_name = "tdb",
 762     .m_doc = MODULE_DOC,
 763     .m_size = -1,
 764     .m_methods = tdb_methods,
 765 };
 766 #endif
 767
 768 PyObject* module_init(void);
 769 PyObject* module_init(void)
 770 {
 771         PyObject *m;
 772
 773         if (PyType_Ready(&PyTdb) < 0)
 774                 return NULL;
 775
 776         if (PyType_Ready(&PyTdbIterator) < 0)
 777                 return NULL;
 778
 779 #if PY_MAJOR_VERSION >= 3
 780         m = PyModule_Create(&moduledef);
 781 #else
 782         m = Py_InitModule3("tdb", tdb_methods, MODULE_DOC);
 783 #endif
 784         if (m == NULL)
 785                 return NULL;
 786
 787         PyModule_AddIntConstant(m, "REPLACE", TDB_REPLACE);
 788         PyModule_AddIntConstant(m, "INSERT", TDB_INSERT);
 789         PyModule_AddIntConstant(m, "MODIFY", TDB_MODIFY);
 790
 791         PyModule_AddIntConstant(m, "DEFAULT", TDB_DEFAULT);
 792         PyModule_AddIntConstant(m, "CLEAR_IF_FIRST", TDB_CLEAR_IF_FIRST);
 793         PyModule_AddIntConstant(m, "INTERNAL", TDB_INTERNAL);
 794         PyModule_AddIntConstant(m, "NOLOCK", TDB_NOLOCK);
 795         PyModule_AddIntConstant(m, "NOMMAP", TDB_NOMMAP);
 796         PyModule_AddIntConstant(m, "CONVERT", TDB_CONVERT);
 797         PyModule_AddIntConstant(m, "BIGENDIAN", TDB_BIGENDIAN);
 798         PyModule_AddIntConstant(m, "NOSYNC", TDB_NOSYNC);
 799         PyModule_AddIntConstant(m, "SEQNUM", TDB_SEQNUM);
 800         PyModule_AddIntConstant(m, "VOLATILE", TDB_VOLATILE);
 801         PyModule_AddIntConstant(m, "ALLOW_NESTING", TDB_ALLOW_NESTING);
 802         PyModule_AddIntConstant(m, "DISALLOW_NESTING", TDB_DISALLOW_NESTING);
 803         PyModule_AddIntConstant(m, "INCOMPATIBLE_HASH", TDB_INCOMPATIBLE_HASH);
 804
 805         PyModule_AddStringConstant(m, "__docformat__", "restructuredText");
 806
 807         PyModule_AddStringConstant(m, "__version__", PACKAGE_VERSION);
 808
 809         Py_INCREF(&PyTdb);
 810         PyModule_AddObject(m, "Tdb", (PyObject *)&PyTdb);
 811
 812         Py_INCREF(&PyTdbIterator);
 813
 814     return m;
 815 }
 816
 817
 818 #if PY_MAJOR_VERSION >= 3
 819 PyMODINIT_FUNC PyInit_tdb(void);
 820 PyMODINIT_FUNC PyInit_tdb(void)
 821 {
 822     return module_init();
 823 }
 824 #else
 825 void inittdb(void);
 826 void inittdb(void)
 827 {
 828     module_init();
 829 }
 830 #endif