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