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cpython/Modules/bsddbmodule.c

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/* Berkeley DB interface.
Author: Michael McLay
Hacked: Guido van Rossum
Btree and Recno additions plus sequence methods: David Ely
Hacked by Gustavo Niemeyer <niemeyer@conectiva.com> fixing recno
support.
XXX To do:
- provide a way to access the various hash functions
- support more open flags
The windows port of the Berkeley DB code is hard to find on the web:
www.nightmare.com/software.html
*/
#include "Python.h"
#ifdef WITH_THREAD
#include "pythread.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_DB_185_H
#include <db_185.h>
#else
#include <db.h>
#endif
/* Please don't include internal header files of the Berkeley db package
(it messes up the info required in the Setup file) */
typedef struct {
PyObject_HEAD
DB *di_bsddb;
int di_size; /* -1 means recompute */
int di_type;
#ifdef WITH_THREAD
PyThread_type_lock di_lock;
#endif
} bsddbobject;
staticforward PyTypeObject Bsddbtype;
#define is_bsddbobject(v) ((v)->ob_type == &Bsddbtype)
#define check_bsddbobject_open(v, r) if ((v)->di_bsddb == NULL) \
{ PyErr_SetString(BsddbError, \
"BSDDB object has already been closed"); \
return r; }
static PyObject *BsddbError;
static PyObject *
newdbhashobject(char *file, int flags, int mode,
int bsize, int ffactor, int nelem, int cachesize,
int hash, int lorder)
{
bsddbobject *dp;
HASHINFO info;
if ((dp = PyObject_New(bsddbobject, &Bsddbtype)) == NULL)
return NULL;
info.bsize = bsize;
info.ffactor = ffactor;
info.nelem = nelem;
info.cachesize = cachesize;
info.hash = NULL; /* XXX should derive from hash argument */
info.lorder = lorder;
#ifdef O_BINARY
flags |= O_BINARY;
#endif
Py_BEGIN_ALLOW_THREADS
dp->di_bsddb = dbopen(file, flags, mode, DB_HASH, &info);
Py_END_ALLOW_THREADS
if (dp->di_bsddb == NULL) {
PyErr_SetFromErrno(BsddbError);
#ifdef WITH_THREAD
dp->di_lock = NULL;
#endif
Py_DECREF(dp);
return NULL;
}
dp->di_size = -1;
dp->di_type = DB_HASH;
#ifdef WITH_THREAD
dp->di_lock = PyThread_allocate_lock();
if (dp->di_lock == NULL) {
PyErr_SetString(BsddbError, "can't allocate lock");
Py_DECREF(dp);
return NULL;
}
#endif
return (PyObject *)dp;
}
static PyObject *
newdbbtobject(char *file, int flags, int mode,
int btflags, int cachesize, int maxkeypage,
int minkeypage, int psize, int lorder)
{
bsddbobject *dp;
BTREEINFO info;
if ((dp = PyObject_New(bsddbobject, &Bsddbtype)) == NULL)
return NULL;
info.flags = btflags;
info.cachesize = cachesize;
info.maxkeypage = maxkeypage;
info.minkeypage = minkeypage;
info.psize = psize;
info.lorder = lorder;
info.compare = 0; /* Use default comparison functions, for now..*/
info.prefix = 0;
#ifdef O_BINARY
flags |= O_BINARY;
#endif
Py_BEGIN_ALLOW_THREADS
dp->di_bsddb = dbopen(file, flags, mode, DB_BTREE, &info);
Py_END_ALLOW_THREADS
if (dp->di_bsddb == NULL) {
PyErr_SetFromErrno(BsddbError);
#ifdef WITH_THREAD
dp->di_lock = NULL;
#endif
Py_DECREF(dp);
return NULL;
}
dp->di_size = -1;
dp->di_type = DB_BTREE;
#ifdef WITH_THREAD
dp->di_lock = PyThread_allocate_lock();
if (dp->di_lock == NULL) {
PyErr_SetString(BsddbError, "can't allocate lock");
Py_DECREF(dp);
return NULL;
}
#endif
return (PyObject *)dp;
}
static PyObject *
newdbrnobject(char *file, int flags, int mode,
int rnflags, int cachesize, int psize, int lorder,
size_t reclen, u_char bval, char *bfname)
{
bsddbobject *dp;
RECNOINFO info;
int fd;
if ((dp = PyObject_New(bsddbobject, &Bsddbtype)) == NULL)
return NULL;
info.flags = rnflags;
info.cachesize = cachesize;
info.psize = psize;
info.lorder = lorder;
info.reclen = reclen;
info.bval = bval;
info.bfname = bfname;
#ifdef O_BINARY
flags |= O_BINARY;
#endif
/* This is a hack to avoid a dbopen() bug that happens when
* it fails. */
fd = open(file, flags);
if (fd == -1) {
dp->di_bsddb = NULL;
}
else {
close(fd);
Py_BEGIN_ALLOW_THREADS
dp->di_bsddb = dbopen(file, flags, mode, DB_RECNO, &info);
Py_END_ALLOW_THREADS
}
if (dp->di_bsddb == NULL) {
PyErr_SetFromErrno(BsddbError);
#ifdef WITH_THREAD
dp->di_lock = NULL;
#endif
Py_DECREF(dp);
return NULL;
}
dp->di_size = -1;
dp->di_type = DB_RECNO;
#ifdef WITH_THREAD
dp->di_lock = PyThread_allocate_lock();
if (dp->di_lock == NULL) {
PyErr_SetString(BsddbError, "can't allocate lock");
Py_DECREF(dp);
return NULL;
}
#endif
return (PyObject *)dp;
}
static void
bsddb_dealloc(bsddbobject *dp)
{
#ifdef WITH_THREAD
if (dp->di_lock) {
PyThread_acquire_lock(dp->di_lock, 0);
PyThread_release_lock(dp->di_lock);
PyThread_free_lock(dp->di_lock);
dp->di_lock = NULL;
}
#endif
if (dp->di_bsddb != NULL) {
int status;
Py_BEGIN_ALLOW_THREADS
status = (dp->di_bsddb->close)(dp->di_bsddb);
Py_END_ALLOW_THREADS
if (status != 0)
fprintf(stderr,
"Python bsddb: close errno %d in dealloc\n",
errno);
}
PyObject_Del(dp);
}
#ifdef WITH_THREAD
#define BSDDB_BGN_SAVE(_dp) \
Py_BEGIN_ALLOW_THREADS PyThread_acquire_lock(_dp->di_lock,1);
#define BSDDB_END_SAVE(_dp) \
PyThread_release_lock(_dp->di_lock); Py_END_ALLOW_THREADS
#else
#define BSDDB_BGN_SAVE(_dp) Py_BEGIN_ALLOW_THREADS
#define BSDDB_END_SAVE(_dp) Py_END_ALLOW_THREADS
#endif
static int
bsddb_length(bsddbobject *dp)
{
check_bsddbobject_open(dp, -1);
if (dp->di_size < 0) {
DBT krec, drec;
int status;
int size = 0;
BSDDB_BGN_SAVE(dp)
for (status = (dp->di_bsddb->seq)(dp->di_bsddb,
&krec, &drec,R_FIRST);
status == 0;
status = (dp->di_bsddb->seq)(dp->di_bsddb,
&krec, &drec, R_NEXT))
size++;
BSDDB_END_SAVE(dp)
if (status < 0) {
PyErr_SetFromErrno(BsddbError);
return -1;
}
dp->di_size = size;
}
return dp->di_size;
}
static PyObject *
bsddb_subscript(bsddbobject *dp, PyObject *key)
{
int status;
DBT krec, drec;
char *data,buf[4096];
int size;
PyObject *result;
recno_t recno;
if (dp->di_type == DB_RECNO) {
if (!PyArg_Parse(key, "i", &recno)) {
PyErr_SetString(PyExc_TypeError,
"key type must be integer");
return NULL;
}
krec.data = &recno;
krec.size = sizeof(recno);
}
else {
if (!PyArg_Parse(key, "s#", &data, &size)) {
PyErr_SetString(PyExc_TypeError,
"key type must be string");
return NULL;
}
krec.data = data;
krec.size = size;
}
check_bsddbobject_open(dp, NULL);
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->get)(dp->di_bsddb, &krec, &drec, 0);
if (status == 0) {
if (drec.size > sizeof(buf)) data = malloc(drec.size);
else data = buf;
if (data!=NULL) memcpy(data,drec.data,drec.size);
}
BSDDB_END_SAVE(dp)
if (data==NULL) return PyErr_NoMemory();
if (status != 0) {
if (status < 0)
PyErr_SetFromErrno(BsddbError);
else
PyErr_SetObject(PyExc_KeyError, key);
return NULL;
}
result = PyString_FromStringAndSize(data, (int)drec.size);
if (data != buf) free(data);
return result;
}
static int
bsddb_ass_sub(bsddbobject *dp, PyObject *key, PyObject *value)
{
int status;
DBT krec, drec;
char *data;
int size;
recno_t recno;
if (dp->di_type == DB_RECNO) {
if (!PyArg_Parse(key, "i", &recno)) {
PyErr_SetString(PyExc_TypeError,
"bsddb key type must be integer");
return -1;
}
krec.data = &recno;
krec.size = sizeof(recno);
}
else {
if (!PyArg_Parse(key, "s#", &data, &size)) {
PyErr_SetString(PyExc_TypeError,
"bsddb key type must be string");
return -1;
}
krec.data = data;
krec.size = size;
}
check_bsddbobject_open(dp, -1);
dp->di_size = -1;
if (value == NULL) {
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->del)(dp->di_bsddb, &krec, 0);
BSDDB_END_SAVE(dp)
}
else {
if (!PyArg_Parse(value, "s#", &data, &size)) {
PyErr_SetString(PyExc_TypeError,
"bsddb value type must be string");
return -1;
}
drec.data = data;
drec.size = size;
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->put)(dp->di_bsddb, &krec, &drec, 0);
BSDDB_END_SAVE(dp)
}
if (status != 0) {
if (status < 0)
PyErr_SetFromErrno(BsddbError);
else
PyErr_SetObject(PyExc_KeyError, key);
return -1;
}
return 0;
}
static PyMappingMethods bsddb_as_mapping = {
(inquiry)bsddb_length, /*mp_length*/
(binaryfunc)bsddb_subscript, /*mp_subscript*/
(objobjargproc)bsddb_ass_sub, /*mp_ass_subscript*/
};
static PyObject *
bsddb_close(bsddbobject *dp)
{
if (dp->di_bsddb != NULL) {
int status;
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->close)(dp->di_bsddb);
BSDDB_END_SAVE(dp)
if (status != 0) {
dp->di_bsddb = NULL;
PyErr_SetFromErrno(BsddbError);
return NULL;
}
}
dp->di_bsddb = NULL;
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
bsddb_keys(bsddbobject *dp)
{
PyObject *list, *item=NULL;
DBT krec, drec;
char *data=NULL,buf[4096];
int status;
int err;
check_bsddbobject_open(dp, NULL);
list = PyList_New(0);
if (list == NULL)
return NULL;
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->seq)(dp->di_bsddb, &krec, &drec, R_FIRST);
if (status == 0) {
if (krec.size > sizeof(buf)) data = malloc(krec.size);
else data = buf;
if (data != NULL) memcpy(data,krec.data,krec.size);
}
BSDDB_END_SAVE(dp)
if (status == 0 && data==NULL) return PyErr_NoMemory();
while (status == 0) {
if (dp->di_type == DB_RECNO)
item = PyInt_FromLong(*((int*)data));
else
item = PyString_FromStringAndSize(data,
(int)krec.size);
if (data != buf) free(data);
if (item == NULL) {
Py_DECREF(list);
return NULL;
}
err = PyList_Append(list, item);
Py_DECREF(item);
if (err != 0) {
Py_DECREF(list);
return NULL;
}
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->seq)
(dp->di_bsddb, &krec, &drec, R_NEXT);
if (status == 0) {
if (krec.size > sizeof(buf))
data = malloc(krec.size);
else data = buf;
if (data != NULL)
memcpy(data,krec.data,krec.size);
}
BSDDB_END_SAVE(dp)
if (data == NULL) return PyErr_NoMemory();
}
if (status < 0) {
PyErr_SetFromErrno(BsddbError);
Py_DECREF(list);
return NULL;
}
if (dp->di_size < 0)
dp->di_size = PyList_Size(list); /* We just did the work */
return list;
}
static PyObject *
bsddb_has_key(bsddbobject *dp, PyObject *args)
{
DBT krec, drec;
int status;
char *data;
int size;
recno_t recno;
if (dp->di_type == DB_RECNO) {
if (!PyArg_ParseTuple(args, "i;key type must be integer",
&recno)) {
return NULL;
}
krec.data = &recno;
krec.size = sizeof(recno);
}
else {
if (!PyArg_ParseTuple(args, "s#;key type must be string",
&data, &size)) {
return NULL;
}
krec.data = data;
krec.size = size;
}
check_bsddbobject_open(dp, NULL);
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->get)(dp->di_bsddb, &krec, &drec, 0);
BSDDB_END_SAVE(dp)
if (status < 0) {
PyErr_SetFromErrno(BsddbError);
return NULL;
}
return PyInt_FromLong(status == 0);
}
static PyObject *
bsddb_set_location(bsddbobject *dp, PyObject *key)
{
int status;
DBT krec, drec;
char *data,buf[4096];
int size;
PyObject *result;
recno_t recno;
if (dp->di_type == DB_RECNO) {
if (!PyArg_ParseTuple(key, "i;key type must be integer",
&recno)) {
return NULL;
}
krec.data = &recno;
krec.size = sizeof(recno);
}
else {
if (!PyArg_ParseTuple(key, "s#;key type must be string",
&data, &size)) {
return NULL;
}
krec.data = data;
krec.size = size;
}
check_bsddbobject_open(dp, NULL);
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->seq)(dp->di_bsddb, &krec, &drec, R_CURSOR);
if (status == 0) {
if (drec.size > sizeof(buf)) data = malloc(drec.size);
else data = buf;
if (data!=NULL) memcpy(data,drec.data,drec.size);
}
BSDDB_END_SAVE(dp)
if (data==NULL) return PyErr_NoMemory();
if (status != 0) {
if (status < 0)
PyErr_SetFromErrno(BsddbError);
else
PyErr_SetObject(PyExc_KeyError, key);
return NULL;
}
if (dp->di_type == DB_RECNO)
result = Py_BuildValue("is#", *((int*)krec.data),
data, drec.size);
else
result = Py_BuildValue("s#s#", krec.data, krec.size,
data, drec.size);
if (data != buf) free(data);
return result;
}
static PyObject *
bsddb_seq(bsddbobject *dp, int sequence_request)
{
int status;
DBT krec, drec;
char *kdata=NULL,kbuf[4096];
char *ddata=NULL,dbuf[4096];
PyObject *result;
check_bsddbobject_open(dp, NULL);
krec.data = 0;
krec.size = 0;
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->seq)(dp->di_bsddb, &krec,
&drec, sequence_request);
if (status == 0) {
if (krec.size > sizeof(kbuf)) kdata = malloc(krec.size);
else kdata = kbuf;
if (kdata != NULL) memcpy(kdata,krec.data,krec.size);
if (drec.size > sizeof(dbuf)) ddata = malloc(drec.size);
else ddata = dbuf;
if (ddata != NULL) memcpy(ddata,drec.data,drec.size);
}
BSDDB_END_SAVE(dp)
if (status == 0) {
if ((kdata == NULL) || (ddata == NULL))
return PyErr_NoMemory();
}
else {
/* (status != 0) */
if (status < 0)
PyErr_SetFromErrno(BsddbError);
else
PyErr_SetString(PyExc_KeyError, "no key/data pairs");
return NULL;
}
if (dp->di_type == DB_RECNO)
result = Py_BuildValue("is#", *((int*)kdata),
ddata, drec.size);
else
result = Py_BuildValue("s#s#", kdata, krec.size,
ddata, drec.size);
if (kdata != kbuf) free(kdata);
if (ddata != dbuf) free(ddata);
return result;
}
static PyObject *
bsddb_next(bsddbobject *dp)
{
return bsddb_seq(dp, R_NEXT);
}
static PyObject *
bsddb_previous(bsddbobject *dp)
{
return bsddb_seq(dp, R_PREV);
}
static PyObject *
bsddb_first(bsddbobject *dp)
{
return bsddb_seq(dp, R_FIRST);
}
static PyObject *
bsddb_last(bsddbobject *dp)
{
return bsddb_seq(dp, R_LAST);
}
static PyObject *
bsddb_sync(bsddbobject *dp)
{
int status;
check_bsddbobject_open(dp, NULL);
BSDDB_BGN_SAVE(dp)
status = (dp->di_bsddb->sync)(dp->di_bsddb, 0);
BSDDB_END_SAVE(dp)
if (status != 0) {
PyErr_SetFromErrno(BsddbError);
return NULL;
}
return PyInt_FromLong(status = 0);
}
static PyMethodDef bsddb_methods[] = {
{"close", (PyCFunction)bsddb_close, METH_NOARGS},
{"keys", (PyCFunction)bsddb_keys, METH_NOARGS},
{"has_key", (PyCFunction)bsddb_has_key, METH_VARARGS},
{"set_location", (PyCFunction)bsddb_set_location, METH_VARARGS},
{"next", (PyCFunction)bsddb_next, METH_NOARGS},
{"previous", (PyCFunction)bsddb_previous, METH_NOARGS},
{"first", (PyCFunction)bsddb_first, METH_NOARGS},
{"last", (PyCFunction)bsddb_last, METH_NOARGS},
{"sync", (PyCFunction)bsddb_sync, METH_NOARGS},
{NULL, NULL} /* sentinel */
};
static PyObject *
bsddb_getattr(PyObject *dp, char *name)
{
return Py_FindMethod(bsddb_methods, dp, name);
}
static PyTypeObject Bsddbtype = {
PyObject_HEAD_INIT(NULL)
0,
"bsddb.bsddb",
sizeof(bsddbobject),
0,
(destructor)bsddb_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)bsddb_getattr, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
&bsddb_as_mapping, /*tp_as_mapping*/
};
static PyObject *
bsdhashopen(PyObject *self, PyObject *args)
{
char *file;
char *flag = NULL;
int flags = O_RDONLY;
int mode = 0666;
int bsize = 0;
int ffactor = 0;
int nelem = 0;
int cachesize = 0;
int hash = 0; /* XXX currently ignored */
int lorder = 0;
if (!PyArg_ParseTuple(args, "s|siiiiiii:hashopen",
&file, &flag, &mode,
&bsize, &ffactor, &nelem, &cachesize,
&hash, &lorder))
return NULL;
if (flag != NULL) {
/* XXX need to pass O_EXCL, O_EXLOCK, O_NONBLOCK, O_SHLOCK */
if (flag[0] == 'r')
flags = O_RDONLY;
else if (flag[0] == 'w')
flags = O_RDWR;
else if (flag[0] == 'c')
flags = O_RDWR|O_CREAT;
else if (flag[0] == 'n')
flags = O_RDWR|O_CREAT|O_TRUNC;
else {
PyErr_SetString(BsddbError,
"Flag should begin with 'r', 'w', 'c' or 'n'");
return NULL;
}
if (flag[1] == 'l') {
#if defined(O_EXLOCK) && defined(O_SHLOCK)
if (flag[0] == 'r')
flags |= O_SHLOCK;
else
flags |= O_EXLOCK;
#else
PyErr_SetString(BsddbError,
"locking not supported on this platform");
return NULL;
#endif
}
}
return newdbhashobject(file, flags, mode,
bsize, ffactor, nelem, cachesize, hash, lorder);
}
static PyObject *
bsdbtopen(PyObject *self, PyObject *args)
{
char *file;
char *flag = NULL;
int flags = O_RDONLY;
int mode = 0666;
int cachesize = 0;
int maxkeypage = 0;
int minkeypage = 0;
int btflags = 0;
unsigned int psize = 0;
int lorder = 0;
if (!PyArg_ParseTuple(args, "s|siiiiiii:btopen",
&file, &flag, &mode,
&btflags, &cachesize, &maxkeypage, &minkeypage,
&psize, &lorder))
return NULL;
if (flag != NULL) {
/* XXX need to pass O_EXCL, O_EXLOCK, O_NONBLOCK, O_SHLOCK */
if (flag[0] == 'r')
flags = O_RDONLY;
else if (flag[0] == 'w')
flags = O_RDWR;
else if (flag[0] == 'c')
flags = O_RDWR|O_CREAT;
else if (flag[0] == 'n')
flags = O_RDWR|O_CREAT|O_TRUNC;
else {
PyErr_SetString(BsddbError,
"Flag should begin with 'r', 'w', 'c' or 'n'");
return NULL;
}
if (flag[1] == 'l') {
#if defined(O_EXLOCK) && defined(O_SHLOCK)
if (flag[0] == 'r')
flags |= O_SHLOCK;
else
flags |= O_EXLOCK;
#else
PyErr_SetString(BsddbError,
"locking not supported on this platform");
return NULL;
#endif
}
}
return newdbbtobject(file, flags, mode,
btflags, cachesize, maxkeypage, minkeypage,
psize, lorder);
}
static PyObject *
bsdrnopen(PyObject *self, PyObject *args)
{
char *file;
char *flag = NULL;
int flags = O_RDONLY;
int mode = 0666;
int cachesize = 0;
int rnflags = 0;
unsigned int psize = 0;
int lorder = 0;
size_t reclen = 0;
char *bval = "";
char *bfname = NULL;
if (!PyArg_ParseTuple(args, "s|siiiiiiss:rnopen",
&file, &flag, &mode,
&rnflags, &cachesize, &psize, &lorder,
&reclen, &bval, &bfname))
return NULL;
if (flag != NULL) {
/* XXX need to pass O_EXCL, O_EXLOCK, O_NONBLOCK, O_SHLOCK */
if (flag[0] == 'r')
flags = O_RDONLY;
else if (flag[0] == 'w')
flags = O_RDWR;
else if (flag[0] == 'c')
flags = O_RDWR|O_CREAT;
else if (flag[0] == 'n')
flags = O_RDWR|O_CREAT|O_TRUNC;
else {
PyErr_SetString(BsddbError,
"Flag should begin with 'r', 'w', 'c' or 'n'");
return NULL;
}
if (flag[1] == 'l') {
#if defined(O_EXLOCK) && defined(O_SHLOCK)
if (flag[0] == 'r')
flags |= O_SHLOCK;
else
flags |= O_EXLOCK;
#else
PyErr_SetString(BsddbError,
"locking not supported on this platform");
return NULL;
#endif
}
else if (flag[1] != '\0') {
PyErr_SetString(BsddbError,
"Flag char 2 should be 'l' or absent");
return NULL;
}
}
return newdbrnobject(file, flags, mode, rnflags, cachesize,
psize, lorder, reclen, bval[0], bfname);
}
static PyMethodDef bsddbmodule_methods[] = {
{"hashopen", (PyCFunction)bsdhashopen, METH_VARARGS},
{"btopen", (PyCFunction)bsdbtopen, METH_VARARGS},
{"rnopen", (PyCFunction)bsdrnopen, METH_VARARGS},
{0, 0},
};
DL_EXPORT(void)
initbsddb(void) {
PyObject *m, *d;
Bsddbtype.ob_type = &PyType_Type;
m = Py_InitModule("bsddb", bsddbmodule_methods);
d = PyModule_GetDict(m);
BsddbError = PyErr_NewException("bsddb.error", NULL, NULL);
if (BsddbError != NULL)
PyDict_SetItemString(d, "error", BsddbError);
}
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