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