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bpo-33106: change dbm key deletion error for readonly file from KeyError to dbm.error (#6295)

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Xiang Zhang 2018-12-12 20:46:55 +08:00 committed by GitHub
parent 5a718e918d
commit 4fb0b8bc25
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 57 additions and 9 deletions
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4
Doc/library/dbm.rst
View File

@ -73,6 +73,10 @@ available, as well as :meth:`get` and :meth:`setdefault`.
.. versionchanged:: 3.2
:meth:`get` and :meth:`setdefault` are now available in all database modules.
.. versionchanged:: 3.8
Deleting a key from a read-only database raises database module specific error
instead of :exc:`KeyError`.
Key and values are always stored as bytes. This means that when
strings are used they are implicitly converted to the default encoding before
being stored.

6
Doc/whatsnew/3.8.rst
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@ -483,6 +483,12 @@ Changes in the Python API
external entities by default.
(Contributed by Christian Heimes in :issue:`17239`.)
* Deleting a key from a read-only :mod:`dbm` database (:mod:`dbm.dumb`,
:mod:`dbm.gnu` or :mod:`dbm.ndbm`) raises :attr:`error` (:exc:`dbm.dumb.error`,
:exc:`dbm.gnu.error` or :exc:`dbm.ndbm.error`) instead of :exc:`KeyError`.
(Contributed by Xiang Zhang in :issue:`33106`.)
CPython bytecode changes
------------------------

4
Lib/dbm/dumb.py
View File

@ -185,7 +185,7 @@ class _Database(collections.abc.MutableMapping):
def __setitem__(self, key, val):
if self._readonly:
raise ValueError('The database is opened for reading only')
raise error('The database is opened for reading only')
if isinstance(key, str):
key = key.encode('utf-8')
elif not isinstance(key, (bytes, bytearray)):
@ -222,7 +222,7 @@ class _Database(collections.abc.MutableMapping):
def __delitem__(self, key):
if self._readonly:
raise ValueError('The database is opened for reading only')
raise error('The database is opened for reading only')
if isinstance(key, str):
key = key.encode('utf-8')
self._verify_open()

4
Lib/test/test_dbm_dumb.py
View File

@ -82,10 +82,10 @@ class DumbDBMTestCase(unittest.TestCase):
self.init_db()
f = dumbdbm.open(_fname, 'r')
self.read_helper(f)
with self.assertRaisesRegex(ValueError,
with self.assertRaisesRegex(dumbdbm.error,
'The database is opened for reading only'):
f[b'g'] = b'x'
with self.assertRaisesRegex(ValueError,
with self.assertRaisesRegex(dumbdbm.error,
'The database is opened for reading only'):
del f[b'a']
# get() works as in the dict interface

11
Lib/test/test_dbm_gnu.py
View File

@ -131,6 +131,17 @@ class TestGdbm(unittest.TestCase):
self.assertEqual(db['Unicode key \U0001f40d'],
'Unicode value \U0001f40d'.encode())
def test_write_readonly_file(self):
with gdbm.open(filename, 'c') as db:
db[b'bytes key'] = b'bytes value'
with gdbm.open(filename, 'r') as db:
with self.assertRaises(gdbm.error):
del db[b'not exist key']
with self.assertRaises(gdbm.error):
del db[b'bytes key']
with self.assertRaises(gdbm.error):
db[b'not exist key'] = b'not exist value'
@unittest.skipUnless(TESTFN_NONASCII,
'requires OS support of non-ASCII encodings')
def test_nonascii_filename(self):

11
Lib/test/test_dbm_ndbm.py
View File

@ -90,6 +90,17 @@ class DbmTestCase(unittest.TestCase):
self.assertEqual(db['Unicode key \U0001f40d'],
'Unicode value \U0001f40d'.encode())
def test_write_readonly_file(self):
with dbm.ndbm.open(self.filename, 'c') as db:
db[b'bytes key'] = b'bytes value'
with dbm.ndbm.open(self.filename, 'r') as db:
with self.assertRaises(error):
del db[b'not exist key']
with self.assertRaises(error):
del db[b'bytes key']
with self.assertRaises(error):
db[b'not exist key'] = b'not exist value'
@unittest.skipUnless(support.TESTFN_NONASCII,
'requires OS support of non-ASCII encodings')
def test_nonascii_filename(self):

2
Misc/NEWS.d/next/Library/2018-03-30-01-20-35.bpo-33106.zncfvW.rst Normal file
View File

@ -0,0 +1,2 @@
Deleting a key from a read-only dbm database raises module specfic error
instead of KeyError.

13
Modules/_dbmmodule.c
View File

@ -36,6 +36,7 @@ class _dbm.dbm "dbmobject *" "&Dbmtype"
typedef struct {
PyObject_HEAD
int flags;
int di_size; /* -1 means recompute */
DBM *di_dbm;
} dbmobject;
@ -60,6 +61,7 @@ newdbmobject(const char *file, int flags, int mode)
if (dp == NULL)
return NULL;
dp->di_size = -1;
dp->flags = flags;
/* See issue #19296 */
if ( (dp->di_dbm = dbm_open((char *)file, flags, mode)) == 0 ) {
PyErr_SetFromErrnoWithFilename(DbmError, file);
@ -143,13 +145,20 @@ dbm_ass_sub(dbmobject *dp, PyObject *v, PyObject *w)
if (w == NULL) {
if ( dbm_delete(dp->di_dbm, krec) < 0 ) {
dbm_clearerr(dp->di_dbm);
/* we might get a failure for reasons like file corrupted,
but we are not able to distinguish it */
if (dp->flags & O_RDWR) {
PyErr_SetObject(PyExc_KeyError, v);
}
else {
PyErr_SetString(DbmError, "cannot delete item from database");
}
return -1;
}
} else {
if ( !PyArg_Parse(w, "s#", &drec.dptr, &tmp_size) ) {
PyErr_SetString(PyExc_TypeError,
"dbm mappings have byte or string elements only");
"dbm mappings have bytes or string elements only");
return -1;
}
drec.dsize = tmp_size;
@ -335,7 +344,7 @@ _dbm_dbm_setdefault_impl(dbmobject *self, const char *key,
else {
if ( !PyArg_Parse(default_value, "s#", &val.dptr, &tmp_size) ) {
PyErr_SetString(PyExc_TypeError,
"dbm mappings have byte string elements only");
"dbm mappings have bytes or string elements only");
return NULL;
}
val.dsize = tmp_size;

7
Modules/_gdbmmodule.c
View File

@ -186,14 +186,19 @@ dbm_ass_sub(dbmobject *dp, PyObject *v, PyObject *w)
dp->di_size = -1;
if (w == NULL) {
if (gdbm_delete(dp->di_dbm, krec) < 0) {
if (gdbm_errno == GDBM_ITEM_NOT_FOUND) {
PyErr_SetObject(PyExc_KeyError, v);
}
else {
PyErr_SetString(DbmError, gdbm_strerror(gdbm_errno));
}
return -1;
}
}
else {
if (!PyArg_Parse(w, "s#", &drec.dptr, &drec.dsize)) {
PyErr_SetString(PyExc_TypeError,
"gdbm mappings have byte or string elements only");
"gdbm mappings have bytes or string elements only");
return -1;
}
errno = 0;