Fix bsddb.db.DBError derived exceptions so they can be unpickled.

Also adds some backwards compatibility when compiling _bsddb.c on earlier
python versions (needed for pybsddb).

Lib/bsddb/test/test_all.py

@@ -65,6 +65,7 @@ def suite():
         'test_join',
         'test_lock',
         'test_misc',
+        'test_pickle',
         'test_queue',
         'test_recno',
         'test_thread',

Lib/bsddb/test/test_pickle.py

@@ -0,0 +1,75 @@
+
+import sys, os, string
+import pickle
+try:
+    import cPickle
+except ImportError:
+    cPickle = None
+import unittest
+import glob
+
+try:
+    # For Pythons w/distutils pybsddb
+    from bsddb3 import db
+except ImportError, e:
+    # For Python 2.3
+    from bsddb import db
+
+
+#----------------------------------------------------------------------
+
+class pickleTestCase(unittest.TestCase):
+    """Verify that DBError can be pickled and unpickled"""
+    db_home = 'db_home'
+    db_name = 'test-dbobj.db'
+
+    def setUp(self):
+        homeDir = os.path.join(os.path.dirname(sys.argv[0]), 'db_home')
+        self.homeDir = homeDir
+        try: os.mkdir(homeDir)
+        except os.error: pass
+
+    def tearDown(self):
+        if hasattr(self, 'db'):
+            del self.db
+        if hasattr(self, 'env'):
+            del self.env
+        files = glob.glob(os.path.join(self.homeDir, '*'))
+        for file in files:
+            os.remove(file)
+
+    def _base_test_pickle_DBError(self, pickle):
+        self.env = db.DBEnv()
+        self.env.open(self.homeDir, db.DB_CREATE | db.DB_INIT_MPOOL)
+        self.db = db.DB(self.env)
+        self.db.open(self.db_name, db.DB_HASH, db.DB_CREATE)
+        self.db.put('spam', 'eggs')
+        assert self.db['spam'] == 'eggs'
+        try:
+            self.db.put('spam', 'ham', flags=db.DB_NOOVERWRITE)
+        except db.DBError, egg:
+            pickledEgg = pickle.dumps(egg)
+            #print repr(pickledEgg)
+            rottenEgg = pickle.loads(pickledEgg)
+            if rottenEgg.args != egg.args or type(rottenEgg) != type(egg):
+                raise Exception, (rottenEgg, '!=', egg)
+        else:
+            raise Exception, "where's my DBError exception?!?"
+
+        self.db.close()
+        self.env.close()
+
+    def test01_pickle_DBError(self):
+        self._base_test_pickle_DBError(pickle=pickle)
+
+    if cPickle:
+        def test02_cPickle_DBError(self):
+            self._base_test_pickle_DBError(pickle=cPickle)
+
+#----------------------------------------------------------------------
+
+def test_suite():
+    return unittest.makeSuite(pickleTestCase)
+
+if __name__ == '__main__':
+    unittest.main(defaultTest='test_suite')

Misc/NEWS

@@ -15,6 +15,8 @@ Core and builtins
 Extension Modules
 -----------------
 
+- Fix bsddb.db.DBError derived exceptions so they can be unpickled.
+
 Library
 -------
 

Modules/_bsddb.c

@@ -101,6 +101,10 @@
 static char *rcs_id = "$Id$";
 
 
+#if (PY_VERSION_HEX < 0x02050000)
+#define Py_ssize_t      int
+#endif
+
 #ifdef WITH_THREAD
 
 /* These are for when calling Python --> C */
@@ -4688,7 +4692,11 @@ static PyMethodDef DB_methods[] = {
 
 
 static PyMappingMethods DB_mapping = {
+#if (PY_VERSION_HEX < 0x02050000)
+        (inquiry)DB_length,          /*mp_length*/
+#else
         (lenfunc)DB_length,          /*mp_length*/
+#endif
         (binaryfunc)DB_subscript,    /*mp_subscript*/
         (objobjargproc)DB_ass_sub,   /*mp_ass_subscript*/
 };
@@ -5385,9 +5393,21 @@ DL_EXPORT(void) init_bsddb(void)
     ADD_INT(d, DB_SET_TXN_TIMEOUT);
 #endif
 
+    /* The exception name must be correct for pickled exception *
+     * objects to unpickle properly.                            */
+#ifdef PYBSDDB_STANDALONE  /* different value needed for standalone pybsddb */
+#define PYBSDDB_EXCEPTION_BASE  "bsddb3.db."
+#else
+#define PYBSDDB_EXCEPTION_BASE  "bsddb.db."
+#endif
+
+    /* All the rest of the exceptions derive only from DBError */
+#define MAKE_EX(name)   name = PyErr_NewException(PYBSDDB_EXCEPTION_BASE #name, DBError, NULL); \
+                        PyDict_SetItemString(d, #name, name)
+
     /* The base exception class is DBError */
-    DBError = PyErr_NewException("bsddb._db.DBError", NULL, NULL);
-    PyDict_SetItemString(d, "DBError", DBError);
+    DBError = NULL;     /* used in MAKE_EX so that it derives from nothing */
+    MAKE_EX(DBError);
 
     /* Some magic to make DBNotFoundError and DBKeyEmptyError derive
      * from both DBError and KeyError, since the API only supports
@@ -5401,10 +5421,6 @@ DL_EXPORT(void) init_bsddb(void)
     PyDict_DelItemString(d, "KeyError");
 
 
-    /* All the rest of the exceptions derive only from DBError */
-#define MAKE_EX(name)   name = PyErr_NewException("bsddb._db." #name, DBError, NULL); \
-                        PyDict_SetItemString(d, #name, name)
-
 #if !INCOMPLETE_IS_WARNING
     MAKE_EX(DBIncompleteError);
 #endif