diff options
Diffstat (limited to 'lib/tdb2')
| -rw-r--r-- | lib/tdb2/pytdb.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/lib/tdb2/pytdb.c b/lib/tdb2/pytdb.c new file mode 100644 index 0000000000..86f604874b --- /dev/null +++ b/lib/tdb2/pytdb.c @@ -0,0 +1,574 @@ +/* + Unix SMB/CIFS implementation. + + Python interface to tdb2. Simply modified from tdb1 version. + + Copyright (C) 2004-2006 Tim Potter <tpot@samba.org> + Copyright (C) 2007-2008 Jelmer Vernooij <jelmer@samba.org> + Copyright (C) 2011 Rusty Russell <rusty@rustcorp.com.au> + + ** NOTE! The following LGPL license applies to the tdb + ** library. This does NOT imply that all of Samba is released + ** under the LGPL + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 3 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, see <http://www.gnu.org/licenses/>. +*/ + +#include <Python.h> +#include "replace.h" +#include "system/filesys.h" + +#ifndef Py_RETURN_NONE +#define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None +#endif + +/* Include tdb headers */ +#include <tdb2.h> + +typedef struct { + PyObject_HEAD + struct tdb_context *ctx; + bool closed; +} PyTdbObject; + +staticforward PyTypeObject PyTdb; + +static void PyErr_SetTDBError(enum TDB_ERROR e) +{ + PyErr_SetObject(PyExc_RuntimeError, + Py_BuildValue("(i,s)", e, tdb_errorstr(e))); +} + +static TDB_DATA PyString_AsTDB_DATA(PyObject *data) +{ + TDB_DATA ret; + ret.dptr = (unsigned char *)PyString_AsString(data); + ret.dsize = PyString_Size(data); + return ret; +} + +static PyObject *PyString_FromTDB_DATA(TDB_DATA data) +{ + PyObject *ret = PyString_FromStringAndSize((const char *)data.dptr, + data.dsize); + free(data.dptr); + return ret; +} + +#define PyErr_TDB_ERROR_IS_ERR_RAISE(ret) \ + if (ret != TDB_SUCCESS) { \ + PyErr_SetTDBError(ret); \ + return NULL; \ + } + +static PyObject *py_tdb_open(PyTypeObject *type, PyObject *args, PyObject *kwargs) +{ + char *name = NULL; + int tdb_flags = TDB_DEFAULT, flags = O_RDWR, mode = 0600; + struct tdb_context *ctx; + PyTdbObject *ret; + const char *kwnames[] = { "name", "tdb_flags", "flags", "mode", NULL }; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|siii", (char **)kwnames, &name, &tdb_flags, &flags, &mode)) + return NULL; + + if (name == NULL) { + tdb_flags |= TDB_INTERNAL; + } + + ctx = tdb_open(name, tdb_flags, flags, mode, NULL); + if (ctx == NULL) { + PyErr_SetFromErrno(PyExc_IOError); + return NULL; + } + + ret = PyObject_New(PyTdbObject, &PyTdb); + if (!ret) { + tdb_close(ctx); + return NULL; + } + + ret->ctx = ctx; + ret->closed = false; + return (PyObject *)ret; +} + +static PyObject *obj_transaction_cancel(PyTdbObject *self) +{ + tdb_transaction_cancel(self->ctx); + Py_RETURN_NONE; +} + +static PyObject *obj_transaction_commit(PyTdbObject *self) +{ + enum TDB_ERROR ret = tdb_transaction_commit(self->ctx); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_transaction_prepare_commit(PyTdbObject *self) +{ + enum TDB_ERROR ret = tdb_transaction_prepare_commit(self->ctx); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_transaction_start(PyTdbObject *self) +{ + enum TDB_ERROR ret = tdb_transaction_start(self->ctx); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_lockall(PyTdbObject *self) +{ + enum TDB_ERROR ret = tdb_lockall(self->ctx); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_unlockall(PyTdbObject *self) +{ + tdb_unlockall(self->ctx); + Py_RETURN_NONE; +} + +static PyObject *obj_lockall_read(PyTdbObject *self) +{ + enum TDB_ERROR ret = tdb_lockall_read(self->ctx); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_unlockall_read(PyTdbObject *self) +{ + tdb_unlockall_read(self->ctx); + Py_RETURN_NONE; +} + +static PyObject *obj_close(PyTdbObject *self) +{ + enum TDB_ERROR ret; + if (self->closed) + Py_RETURN_NONE; + ret = tdb_close(self->ctx); + self->closed = true; + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_get(PyTdbObject *self, PyObject *args) +{ + TDB_DATA key, data; + PyObject *py_key; + enum TDB_ERROR ret; + if (!PyArg_ParseTuple(args, "O", &py_key)) + return NULL; + + key = PyString_AsTDB_DATA(py_key); + ret = tdb_fetch(self->ctx, key, &data); + if (ret == TDB_ERR_NOEXIST) + Py_RETURN_NONE; + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + return PyString_FromTDB_DATA(data); +} + +static PyObject *obj_append(PyTdbObject *self, PyObject *args) +{ + TDB_DATA key, data; + PyObject *py_key, *py_data; + enum TDB_ERROR ret; + if (!PyArg_ParseTuple(args, "OO", &py_key, &py_data)) + return NULL; + + key = PyString_AsTDB_DATA(py_key); + data = PyString_AsTDB_DATA(py_data); + + ret = tdb_append(self->ctx, key, data); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_firstkey(PyTdbObject *self) +{ + enum TDB_ERROR ret; + TDB_DATA key; + + ret = tdb_firstkey(self->ctx, &key); + if (ret == TDB_ERR_NOEXIST) + Py_RETURN_NONE; + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + + return PyString_FromTDB_DATA(key); +} + +static PyObject *obj_nextkey(PyTdbObject *self, PyObject *args) +{ + TDB_DATA key; + PyObject *py_key; + enum TDB_ERROR ret; + if (!PyArg_ParseTuple(args, "O", &py_key)) + return NULL; + + /* Malloc here, since tdb_nextkey frees. */ + key.dsize = PyString_Size(py_key); + key.dptr = malloc(key.dsize); + memcpy(key.dptr, PyString_AsString(py_key), key.dsize); + + ret = tdb_nextkey(self->ctx, &key); + if (ret == TDB_ERR_NOEXIST) + Py_RETURN_NONE; + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + + return PyString_FromTDB_DATA(key); +} + +static PyObject *obj_delete(PyTdbObject *self, PyObject *args) +{ + TDB_DATA key; + PyObject *py_key; + enum TDB_ERROR ret; + if (!PyArg_ParseTuple(args, "O", &py_key)) + return NULL; + + key = PyString_AsTDB_DATA(py_key); + ret = tdb_delete(self->ctx, key); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_has_key(PyTdbObject *self, PyObject *args) +{ + TDB_DATA key; + enum TDB_ERROR ret; + PyObject *py_key; + if (!PyArg_ParseTuple(args, "O", &py_key)) + return NULL; + + key = PyString_AsTDB_DATA(py_key); + ret = tdb_exists(self->ctx, key); + if (ret == TDB_ERR_NOEXIST) + return Py_False; + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + return Py_True; +} + +static PyObject *obj_store(PyTdbObject *self, PyObject *args) +{ + TDB_DATA key, value; + enum TDB_ERROR ret; + int flag = TDB_REPLACE; + PyObject *py_key, *py_value; + + if (!PyArg_ParseTuple(args, "OO|i", &py_key, &py_value, &flag)) + return NULL; + + key = PyString_AsTDB_DATA(py_key); + value = PyString_AsTDB_DATA(py_value); + + ret = tdb_store(self->ctx, key, value, flag); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_add_flag(PyTdbObject *self, PyObject *args) +{ + unsigned flag; + + if (!PyArg_ParseTuple(args, "I", &flag)) + return NULL; + + tdb_add_flag(self->ctx, flag); + Py_RETURN_NONE; +} + +static PyObject *obj_remove_flag(PyTdbObject *self, PyObject *args) +{ + unsigned flag; + + if (!PyArg_ParseTuple(args, "I", &flag)) + return NULL; + + tdb_remove_flag(self->ctx, flag); + Py_RETURN_NONE; +} + +typedef struct { + PyObject_HEAD + TDB_DATA current; + bool end; + PyTdbObject *iteratee; +} PyTdbIteratorObject; + +static PyObject *tdb_iter_next(PyTdbIteratorObject *self) +{ + enum TDB_ERROR e; + PyObject *ret; + if (self->end) + return NULL; + ret = PyString_FromStringAndSize((const char *)self->current.dptr, + self->current.dsize); + e = tdb_nextkey(self->iteratee->ctx, &self->current); + if (e == TDB_ERR_NOEXIST) + self->end = true; + else + PyErr_TDB_ERROR_IS_ERR_RAISE(e); + return ret; +} + +static void tdb_iter_dealloc(PyTdbIteratorObject *self) +{ + Py_DECREF(self->iteratee); + PyObject_Del(self); +} + +PyTypeObject PyTdbIterator = { + .tp_name = "Iterator", + .tp_basicsize = sizeof(PyTdbIteratorObject), + .tp_iternext = (iternextfunc)tdb_iter_next, + .tp_dealloc = (destructor)tdb_iter_dealloc, + .tp_flags = Py_TPFLAGS_DEFAULT, + .tp_iter = PyObject_SelfIter, +}; + +static PyObject *tdb_object_iter(PyTdbObject *self) +{ + PyTdbIteratorObject *ret; + enum TDB_ERROR e; + + ret = PyObject_New(PyTdbIteratorObject, &PyTdbIterator); + if (!ret) + return NULL; + e = tdb_firstkey(self->ctx, &ret->current); + if (e == TDB_ERR_NOEXIST) { + ret->end = true; + } else { + PyErr_TDB_ERROR_IS_ERR_RAISE(e); + ret->end = false; + } + ret->iteratee = self; + Py_INCREF(self); + return (PyObject *)ret; +} + +static PyObject *obj_clear(PyTdbObject *self) +{ + enum TDB_ERROR ret = tdb_wipe_all(self->ctx); + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + Py_RETURN_NONE; +} + +static PyObject *obj_enable_seqnum(PyTdbObject *self) +{ + tdb_add_flag(self->ctx, TDB_SEQNUM); + Py_RETURN_NONE; +} + +static PyMethodDef tdb_object_methods[] = { + { "transaction_cancel", (PyCFunction)obj_transaction_cancel, METH_NOARGS, + "S.transaction_cancel() -> None\n" + "Cancel the currently active transaction." }, + { "transaction_commit", (PyCFunction)obj_transaction_commit, METH_NOARGS, + "S.transaction_commit() -> None\n" + "Commit the currently active transaction." }, + { "transaction_prepare_commit", (PyCFunction)obj_transaction_prepare_commit, METH_NOARGS, + "S.transaction_prepare_commit() -> None\n" + "Prepare to commit the currently active transaction" }, + { "transaction_start", (PyCFunction)obj_transaction_start, METH_NOARGS, + "S.transaction_start() -> None\n" + "Start a new transaction." }, + { "lock_all", (PyCFunction)obj_lockall, METH_NOARGS, NULL }, + { "unlock_all", (PyCFunction)obj_unlockall, METH_NOARGS, NULL }, + { "read_lock_all", (PyCFunction)obj_lockall_read, METH_NOARGS, NULL }, + { "read_unlock_all", (PyCFunction)obj_unlockall_read, METH_NOARGS, NULL }, + { "close", (PyCFunction)obj_close, METH_NOARGS, NULL }, + { "get", (PyCFunction)obj_get, METH_VARARGS, "S.get(key) -> value\n" + "Fetch a value." }, + { "append", (PyCFunction)obj_append, METH_VARARGS, "S.append(key, value) -> None\n" + "Append data to an existing key." }, + { "firstkey", (PyCFunction)obj_firstkey, METH_NOARGS, "S.firstkey() -> data\n" + "Return the first key in this database." }, + { "nextkey", (PyCFunction)obj_nextkey, METH_NOARGS, "S.nextkey(key) -> data\n" + "Return the next key in this database." }, + { "delete", (PyCFunction)obj_delete, METH_VARARGS, "S.delete(key) -> None\n" + "Delete an entry." }, + { "has_key", (PyCFunction)obj_has_key, METH_VARARGS, "S.has_key(key) -> None\n" + "Check whether key exists in this database." }, + { "store", (PyCFunction)obj_store, METH_VARARGS, "S.store(key, data, flag=REPLACE) -> None" + "Store data." }, + { "add_flag", (PyCFunction)obj_add_flag, METH_VARARGS, "S.add_flag(flag) -> None" }, + { "remove_flag", (PyCFunction)obj_remove_flag, METH_VARARGS, "S.remove_flag(flag) -> None" }, + { "iterkeys", (PyCFunction)tdb_object_iter, METH_NOARGS, "S.iterkeys() -> iterator" }, + { "clear", (PyCFunction)obj_clear, METH_NOARGS, "S.clear() -> None\n" + "Wipe the entire database." }, + { "enable_seqnum", (PyCFunction)obj_enable_seqnum, METH_NOARGS, + "S.enable_seqnum() -> None" }, + { NULL } +}; + +static PyObject *obj_get_flags(PyTdbObject *self, void *closure) +{ + return PyInt_FromLong(tdb_get_flags(self->ctx)); +} + +static PyObject *obj_get_filename(PyTdbObject *self, void *closure) +{ + return PyString_FromString(tdb_name(self->ctx)); +} + +static PyObject *obj_get_seqnum(PyTdbObject *self, void *closure) +{ + return PyInt_FromLong(tdb_get_seqnum(self->ctx)); +} + + +static PyGetSetDef tdb_object_getsetters[] = { + { (char *)"flags", (getter)obj_get_flags, NULL, NULL }, + { (char *)"filename", (getter)obj_get_filename, NULL, (char *)"The filename of this TDB file."}, + { (char *)"seqnum", (getter)obj_get_seqnum, NULL, NULL }, + { NULL } +}; + +static PyObject *tdb_object_repr(PyTdbObject *self) +{ + if (tdb_get_flags(self->ctx) & TDB_INTERNAL) { + return PyString_FromString("Tdb(<internal>)"); + } else { + return PyString_FromFormat("Tdb('%s')", tdb_name(self->ctx)); + } +} + +static void tdb_object_dealloc(PyTdbObject *self) +{ + if (!self->closed) + tdb_close(self->ctx); + self->ob_type->tp_free(self); +} + +static PyObject *obj_getitem(PyTdbObject *self, PyObject *key) +{ + TDB_DATA tkey, val; + enum TDB_ERROR ret; + + if (!PyString_Check(key)) { + PyErr_SetString(PyExc_TypeError, "Expected string as key"); + return NULL; + } + + tkey.dptr = (unsigned char *)PyString_AsString(key); + tkey.dsize = PyString_Size(key); + + ret = tdb_fetch(self->ctx, tkey, &val); + if (ret == TDB_ERR_NOEXIST) { + PyErr_SetString(PyExc_KeyError, "No such TDB entry"); + return NULL; + } else { + PyErr_TDB_ERROR_IS_ERR_RAISE(ret); + return PyString_FromTDB_DATA(val); + } +} + +static int obj_setitem(PyTdbObject *self, PyObject *key, PyObject *value) +{ + TDB_DATA tkey, tval; + enum TDB_ERROR ret; + if (!PyString_Check(key)) { + PyErr_SetString(PyExc_TypeError, "Expected string as key"); + return -1; + } + + tkey = PyString_AsTDB_DATA(key); + + if (value == NULL) { + ret = tdb_delete(self->ctx, tkey); + } else { + if (!PyString_Check(value)) { + PyErr_SetString(PyExc_TypeError, "Expected string as value"); + return -1; + } + + tval = PyString_AsTDB_DATA(value); + + ret = tdb_store(self->ctx, tkey, tval, TDB_REPLACE); + } + + if (ret != TDB_SUCCESS) { + PyErr_SetTDBError(ret); + return -1; + } + + return ret; +} + +static PyMappingMethods tdb_object_mapping = { + .mp_subscript = (binaryfunc)obj_getitem, + .mp_ass_subscript = (objobjargproc)obj_setitem, +}; +static PyTypeObject PyTdb = { + .tp_name = "Tdb", + .tp_basicsize = sizeof(PyTdbObject), + .tp_methods = tdb_object_methods, + .tp_getset = tdb_object_getsetters, + .tp_new = py_tdb_open, + .tp_doc = "A TDB file", + .tp_repr = (reprfunc)tdb_object_repr, + .tp_dealloc = (destructor)tdb_object_dealloc, + .tp_as_mapping = &tdb_object_mapping, + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_ITER, + .tp_iter = (getiterfunc)tdb_object_iter, +}; + +static PyMethodDef tdb_methods[] = { + { "open", (PyCFunction)py_tdb_open, METH_VARARGS|METH_KEYWORDS, "open(name, hash_size=0, tdb_flags=TDB_DEFAULT, flags=O_RDWR, mode=0600)\n" + "Open a TDB file." }, + { NULL } +}; + +void inittdb(void); +void inittdb(void) +{ + PyObject *m; + + if (PyType_Ready(&PyTdb) < 0) + return; + + if (PyType_Ready(&PyTdbIterator) < 0) + return; + + m = Py_InitModule3("tdb", tdb_methods, "TDB is a simple key-value database similar to GDBM that supports multiple writers."); + if (m == NULL) + return; + + PyModule_AddObject(m, "REPLACE", PyInt_FromLong(TDB_REPLACE)); + PyModule_AddObject(m, "INSERT", PyInt_FromLong(TDB_INSERT)); + PyModule_AddObject(m, "MODIFY", PyInt_FromLong(TDB_MODIFY)); + + PyModule_AddObject(m, "DEFAULT", PyInt_FromLong(TDB_DEFAULT)); + PyModule_AddObject(m, "INTERNAL", PyInt_FromLong(TDB_INTERNAL)); + PyModule_AddObject(m, "NOLOCK", PyInt_FromLong(TDB_NOLOCK)); + PyModule_AddObject(m, "NOMMAP", PyInt_FromLong(TDB_NOMMAP)); + PyModule_AddObject(m, "CONVERT", PyInt_FromLong(TDB_CONVERT)); + PyModule_AddObject(m, "NOSYNC", PyInt_FromLong(TDB_NOSYNC)); + PyModule_AddObject(m, "SEQNUM", PyInt_FromLong(TDB_SEQNUM)); + PyModule_AddObject(m, "ALLOW_NESTING", PyInt_FromLong(TDB_ALLOW_NESTING)); + + PyModule_AddObject(m, "__docformat__", PyString_FromString("restructuredText")); + + PyModule_AddObject(m, "__version__", PyString_FromString(PACKAGE_VERSION)); + + Py_INCREF(&PyTdb); + PyModule_AddObject(m, "Tdb", (PyObject *)&PyTdb); + + Py_INCREF(&PyTdbIterator); +} |