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