Merge lp:~openerp-dev/openobject-server/trunk-test_cursor-rco into lp:openobject-server

[Raphael Collet (OpenERP)]

Change implementation of the "test" cursor used mainly for js tests:
 - change the lock on registry to allow concurrent accesses during tests only
 - implement a "test" cursor that is used across multiple requests;
   this cursor simulates commit and rollback with a savepoint
 - always use a registry method to retrieve a cursor on the database;
   when in test mode, this method returns a test cursor and serializes requests
 - in unittest classes, make self.registry the registry (not just a function)

[Christophe Simonis (OpenERP) (kangol)]

in file openerp/addons/base/tests/test_db_cursor.py, you can keep the context manager.
in file openerp/sql_db.py: in TestCursor() no need to ovewrite method execute to just call super()

more generally, I'm pretty sure there is still addons that call `registry.db.cursor()`.
To forbid that, can you rename the `db` variable to `__db` (it's private after all)

[lp:~openerp-dev/openobject-server/trunk-test_cursor-rco]

5169. By Raphael Collet (OpenERP) on 2014-04-09

[IMP] sql_db: simplify TestCursor, given that method execute() does not need overriding

5170. By Raphael Collet (OpenERP) on 2014-04-09

[IMP] registry: avoid every direct access registry.db, and rename attribute as registry._db

[Raphael Collet (OpenERP) (rco-openerp)]

openerp/addons/base/tests/test_db_cursor.py: done
openerp/sql_db.py: removed overriding of execute()

In Registry, I renamed registry.db into registry._db, and rewrote every call to registry.db.cursor().

[lp:~openerp-dev/openobject-server/trunk-test_cursor-rco]

5171. By Raphael Collet (OpenERP) on 2014-04-09

[FIX] registry: stupid typo

=== modified file 'openerp/addons/base/res/res_users.py'
--- openerp/addons/base/res/res_users.py	2014-04-07 12:50:50 +0000
+++ openerp/addons/base/res/res_users.py	2014-04-09 13:52:38 +0000
@@ -388,14 +388,13 @@
         if not password:
             return False
         user_id = False
-        cr = self.pool.db.cursor()
+        cr = self.pool.cursor()
         try:
             # autocommit: our single update request will be performed atomically.
             # (In this way, there is no opportunity to have two transactions
             # interleaving their cr.execute()..cr.commit() calls and have one
             # of them rolled back due to a concurrent access.)
-            if not openerp.tools.config['test_enable']:
-                cr.autocommit(True)
+            cr.autocommit(True)
             # check if user exists
             res = self.search(cr, SUPERUSER_ID, [('login','=',login)])
             if res:
@@ -440,7 +439,7 @@
             # Successfully logged in as admin!
             # Attempt to guess the web base url...
             if user_agent_env and user_agent_env.get('base_location'):
-                cr = self.pool.db.cursor()
+                cr = self.pool.cursor()
                 try:
                     base = user_agent_env['base_location']
                     ICP = self.pool['ir.config_parameter']
@@ -461,7 +460,7 @@
             raise openerp.exceptions.AccessDenied()
         if self._uid_cache.get(db, {}).get(uid) == passwd:
             return
-        cr = self.pool.db.cursor()
+        cr = self.pool.cursor()
         try:
             self.check_credentials(cr, uid, passwd)
             if self._uid_cache.has_key(db):

=== modified file 'openerp/addons/base/tests/test_db_cursor.py'
--- openerp/addons/base/tests/test_db_cursor.py	2014-02-09 00:37:45 +0000
+++ openerp/addons/base/tests/test_db_cursor.py	2014-04-09 13:52:38 +0000
@@ -21,7 +21,7 @@
         """
         Try to use iterable but non-list or int params in query parameters.
         """
-        with registry().cursor(auto_commit=False) as cr:
+        with registry().cursor() as cr:
             with self.assertRaises(ValueError):
                 cr.execute("SELECT id FROM res_users WHERE login=%s", 'admin')
             with self.assertRaises(ValueError):

=== modified file 'openerp/addons/base/tests/test_ir_sequence.py'
--- openerp/addons/base/tests/test_ir_sequence.py	2014-03-18 12:41:12 +0000
+++ openerp/addons/base/tests/test_ir_sequence.py	2014-04-09 13:52:38 +0000
@@ -21,7 +21,7 @@
     return openerp.modules.registry.RegistryManager.get(DB)[model]
 
 def cursor():
-    return openerp.modules.registry.RegistryManager.get(DB).db.cursor()
+    return openerp.modules.registry.RegistryManager.get(DB).cursor()
 
 
 def drop_sequence(code):

=== modified file 'openerp/addons/base/tests/test_uninstall.py'
--- openerp/addons/base/tests/test_uninstall.py	2014-02-09 00:37:45 +0000
+++ openerp/addons/base/tests/test_uninstall.py	2014-04-09 13:52:38 +0000
@@ -13,7 +13,7 @@
     return openerp.modules.registry.RegistryManager.get(DB)[model]
 
 def cursor():
-    return openerp.modules.registry.RegistryManager.get(DB).db.cursor()
+    return openerp.modules.registry.RegistryManager.get(DB).cursor()
 
 def get_module(module_name):
     registry = openerp.modules.registry.RegistryManager.get(DB)

=== modified file 'openerp/addons/base/tests/test_views.py'
--- openerp/addons/base/tests/test_views.py	2014-02-25 11:47:06 +0000
+++ openerp/addons/base/tests/test_views.py	2014-04-09 13:52:38 +0000
@@ -28,7 +28,7 @@
             self.assertTreesEqual(c1, c2, msg)
 
 
-class TestNodeLocator(common.BaseCase):
+class TestNodeLocator(common.TransactionCase):
     """
     The node locator returns None when it can not find a node, and the first
     match when it finds something (no jquery-style node sets)

=== modified file 'openerp/cli/server.py'
--- openerp/cli/server.py	2014-04-07 16:05:48 +0000
+++ openerp/cli/server.py	2014-04-09 13:52:38 +0000
@@ -111,7 +111,7 @@
     fileformat = os.path.splitext(config["translate_out"])[-1][1:].lower()
     buf = file(config["translate_out"], "w")
     registry = openerp.modules.registry.RegistryManager.new(dbname)
-    cr = registry.db.cursor()
+    cr = registry.cursor()
     openerp.tools.trans_export(config["language"],
         config["translate_modules"] or ["all"], buf, fileformat, cr)
     cr.close()
@@ -125,7 +125,7 @@
     dbname = config['db_name']
 
     registry = openerp.modules.registry.RegistryManager.new(dbname)
-    cr = registry.db.cursor()
+    cr = registry.cursor()
     openerp.tools.trans_load( cr, config["translate_in"], config["language"],
         context=context)
     cr.commit()

=== modified file 'openerp/http.py'
--- openerp/http.py	2014-04-07 16:05:48 +0000
+++ openerp/http.py	2014-04-09 13:52:38 +0000
@@ -235,10 +235,7 @@
         """
         # some magic to lazy create the cr
         if not self._cr:
-            # Test cursors
-            self._cr = openerp.tests.common.acquire_test_cursor(self.session_id)
-            if not self._cr:
-                self._cr = self.registry.db.cursor()
+            self._cr = self.registry.cursor()
         return self._cr
 
     def __enter__(self):
@@ -249,14 +246,9 @@
         _request_stack.pop()
 
         if self._cr:
-            # Dont close test cursors
-            if not openerp.tests.common.release_test_cursor(self._cr):
-                if exc_type is None and not self._failed:
-                    self._cr.commit()
-                else:
-                    # just to be explicit - happens at close() anyway
-                    self._cr.rollback()
-                self._cr.close()
+            if exc_type is None and not self._failed:
+                self._cr.commit()
+            self._cr.close()
         # just to be sure no one tries to re-use the request
         self.disable_db = True
         self.uid = None
@@ -294,7 +286,7 @@
         def checked_call(___dbname, *a, **kw):
             # The decorator can call us more than once if there is an database error. In this
             # case, the request cursor is unusable. Rollback transaction to create a new one.
-            if self._cr and not openerp.tools.config['test_enable']:
+            if self._cr:
                 self._cr.rollback()
             return self.endpoint(*a, **kw)
 

=== modified file 'openerp/modules/registry.py'
--- openerp/modules/registry.py	2014-02-16 21:22:22 +0000
+++ openerp/modules/registry.py	2014-04-09 13:52:38 +0000
@@ -58,7 +58,10 @@
         self._init_modules = set()
 
         self.db_name = db_name
-        self.db = openerp.sql_db.db_connect(db_name)
+        self._db = openerp.sql_db.db_connect(db_name)
+
+        # special cursor for test mode; None means "normal" mode
+        self.test_cr = None
 
         # Indicates that the registry is 
         self.ready = False
@@ -75,7 +78,7 @@
         # Useful only in a multi-process context.
         self._any_cache_cleared = False
 
-        cr = self.db.cursor()
+        cr = self.cursor()
         has_unaccent = openerp.modules.db.has_unaccent(cr)
         if openerp.tools.config['unaccent'] and not has_unaccent:
             _logger.warning("The option --unaccent was given but no unaccent() function was found in database.")
@@ -102,6 +105,10 @@
         """ Return the model with the given name or raise KeyError if it doesn't exist."""
         return self.models[model_name]
 
+    def __call__(self, model_name):
+        """ Same as ``self[model_name]``. """
+        return self.models[model_name]
+
     def do_parent_store(self, cr):
         for o in self._init_parent:
             self.get(o)._parent_store_compute(cr)
@@ -183,27 +190,38 @@
                     r, c)
         return r, c
 
-    @contextmanager
-    def cursor(self, auto_commit=True):
-        cr = self.db.cursor()
-        try:
-            yield cr
-            if auto_commit:
-                cr.commit()
-        finally:
-            cr.close()
-
-class TestRLock(object):
-    def __init__(self):
-        self._lock = threading.RLock()
+    def enter_test_mode(self):
+        """ Enter the 'test' mode, where one cursor serves several requests. """
+        assert self.test_cr is None
+        self.test_cr = self._db.test_cursor()
+        RegistryManager.enter_test_mode()
+
+    def leave_test_mode(self):
+        """ Leave the test mode. """
+        assert self.test_cr is not None
+        self.test_cr.close(force=True)          # close the cursor for real
+        self.test_cr = None
+        RegistryManager.leave_test_mode()
+
+    def cursor(self):
+        """ Return a new cursor for the database. The cursor itself may be used
+            as a context manager to commit/rollback and close automatically.
+        """
+        if self.test_cr is not None:
+            # While in test mode, we use one special cursor across requests. The
+            # test cursor uses a reentrant lock to serialize accesses. The lock
+            # is granted here by cursor(), and automatically released by the
+            # cursor itself in its method close().
+            self.test_cr.acquire()
+            return self.test_cr
+        return self._db.cursor()
+
+class DummyRLock(object):
+    """ Dummy reentrant lock, to be used while running rpc and js tests """
     def acquire(self):
-        if openerp.tools.config['test_enable']:
-            return
-        return self._lock.acquire()
+        pass
     def release(self):
-        if openerp.tools.config['test_enable']:
-            return
-        return self._lock.release()
+        pass
     def __enter__(self):
         self.acquire()
     def __exit__(self, type, value, traceback):
@@ -219,12 +237,30 @@
     # Mapping between db name and model registry.
     # Accessed through the methods below.
     registries = {}
-    registries_lock = TestRLock()
+    _lock = threading.RLock()
+    _saved_lock = None
+
+    @classmethod
+    def lock(cls):
+        """ Return the current registry lock. """
+        return cls._lock
+
+    @classmethod
+    def enter_test_mode(cls):
+        """ Enter the 'test' mode, where the registry is no longer locked. """
+        assert cls._saved_lock is None
+        cls._lock, cls._saved_lock = DummyRLock(), cls._lock
+
+    @classmethod
+    def leave_test_mode(cls):
+        """ Leave the 'test' mode. """
+        assert cls._saved_lock is not None
+        cls._lock, cls._saved_lock = cls._saved_lock, None
 
     @classmethod
     def get(cls, db_name, force_demo=False, status=None, update_module=False):
         """ Return a registry for a given database name."""
-        with cls.registries_lock:
+        with cls.lock():
             try:
                 return cls.registries[db_name]
             except KeyError:
@@ -244,7 +280,7 @@
 
         """
         import openerp.modules
-        with cls.registries_lock:
+        with cls.lock():
             registry = Registry(db_name)
 
             # Initializing a registry will call general code which will in turn
@@ -259,7 +295,7 @@
                     registry.base_registry_signaling_sequence = seq_registry
                     registry.base_cache_signaling_sequence = seq_cache
                 # This should be a method on Registry
-                openerp.modules.load_modules(registry.db, force_demo, status, update_module)
+                openerp.modules.load_modules(registry._db, force_demo, status, update_module)
             except Exception:
                 del cls.registries[db_name]
                 raise
@@ -269,7 +305,7 @@
             # Yeah, crazy.
             registry = cls.registries[db_name]
 
-            cr = registry.db.cursor()
+            cr = registry.cursor()
             try:
                 registry.do_parent_store(cr)
                 cr.commit()
@@ -286,7 +322,7 @@
     @classmethod
     def delete(cls, db_name):
         """Delete the registry linked to a given database.  """
-        with cls.registries_lock:
+        with cls.lock():
             if db_name in cls.registries:
                 cls.registries[db_name].clear_caches()
                 del cls.registries[db_name]
@@ -294,7 +330,7 @@
     @classmethod
     def delete_all(cls):
         """Delete all the registries. """
-        with cls.registries_lock:
+        with cls.lock():
             for db_name in cls.registries.keys():
                 cls.delete(db_name)
 
@@ -309,7 +345,7 @@
         This method is given to spare you a ``RegistryManager.get(db_name)``
         that would loads the given database if it was not already loaded.
         """
-        with cls.registries_lock:
+        with cls.lock():
             if db_name in cls.registries:
                 cls.registries[db_name].clear_caches()
 
@@ -325,7 +361,7 @@
         changed = False
         if openerp.multi_process and db_name in cls.registries:
             registry = cls.get(db_name)
-            cr = registry.db.cursor()
+            cr = registry.cursor()
             try:
                 cr.execute("""
                     SELECT base_registry_signaling.last_value,
@@ -371,7 +407,7 @@
             registry = cls.get(db_name)
             if registry.any_cache_cleared():
                 _logger.info("At least one model cache has been cleared, signaling through the database.")
-                cr = registry.db.cursor()
+                cr = registry.cursor()
                 r = 1
                 try:
                     cr.execute("select nextval('base_cache_signaling')")
@@ -386,7 +422,7 @@
         if openerp.multi_process and db_name in cls.registries:
             _logger.info("Registry changed, signaling through the database")
             registry = cls.get(db_name)
-            cr = registry.db.cursor()
+            cr = registry.cursor()
             r = 1
             try:
                 cr.execute("select nextval('base_registry_signaling')")

=== modified file 'openerp/pooler.py'
--- openerp/pooler.py	2013-03-27 14:16:53 +0000
+++ openerp/pooler.py	2014-04-09 13:52:38 +0000
@@ -36,7 +36,7 @@
     assert openerp.conf.deprecation.openerp_pooler
     _logger.warning('openerp.pooler.get_db_and_pool() is deprecated.')
     registry = RegistryManager.get(db_name, force_demo, status, update_module)
-    return registry.db, registry
+    return registry._db, registry
 
 
 def restart_pool(db_name, force_demo=False, status=None, update_module=False):
@@ -44,7 +44,7 @@
     _logger.warning('openerp.pooler.restart_pool() is deprecated.')
     assert openerp.conf.deprecation.openerp_pooler
     registry = RegistryManager.new(db_name, force_demo, status, update_module)
-    return registry.db, registry
+    return registry._db, registry
 
 def get_db(db_name):
     """Return a database connection. The corresponding registry is initialized."""

=== modified file 'openerp/service/model.py'
--- openerp/service/model.py	2014-02-09 00:40:05 +0000
+++ openerp/service/model.py	2014-04-09 13:52:38 +0000
@@ -161,21 +161,10 @@
 def execute_kw(db, uid, obj, method, args, kw=None):
     return execute(db, uid, obj, method, *args, **kw or {})
 
-@contextmanager
-def closing_cr_and_commit(cr):
-    try:
-        yield cr
-        cr.commit()
-    except Exception:
-        cr.rollback()
-        raise
-    finally:
-        cr.close()
-
 @check
 def execute(db, uid, obj, method, *args, **kw):
     threading.currentThread().dbname = db
-    with closing_cr_and_commit(openerp.registry(db).db.cursor()) as cr:
+    with openerp.registry(db).cursor() as cr:
         if method.startswith('_'):
             raise except_orm('Access Denied', 'Private methods (such as %s) cannot be called remotely.' % (method,))
         res = execute_cr(cr, uid, obj, method, *args, **kw)
@@ -190,7 +179,7 @@
 
 @check
 def exec_workflow(db, uid, obj, signal, *args):
-    with closing_cr_and_commit(openerp.registry(db).db.cursor()) as cr:
+    with openerp.registry(db).cursor() as cr:
         return exec_workflow_cr(cr, uid, obj, signal, *args)
 
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:

=== modified file 'openerp/service/report.py'
--- openerp/service/report.py	2013-03-27 16:40:45 +0000
+++ openerp/service/report.py	2014-04-09 13:52:38 +0000
@@ -49,7 +49,7 @@
 
     self_reports[id] = {'uid': uid, 'result': False, 'state': False, 'exception': None}
 
-    cr = openerp.registry(db).db.cursor()
+    cr = openerp.registry(db).cursor()
     try:
         result, format = openerp.report.render_report(cr, uid, ids, object, datas, context)
         if not result:
@@ -87,7 +87,7 @@
     self_reports[id] = {'uid': uid, 'result': False, 'state': False, 'exception': None}
 
     def go(id, uid, ids, datas, context):
-        cr = openerp.registry(db).db.cursor()
+        cr = openerp.registry(db).cursor()
         try:
             result, format = openerp.report.render_report(cr, uid, ids, object, datas, context)
             if not result:

=== modified file 'openerp/sql_db.py'
--- openerp/sql_db.py	2014-03-17 12:43:43 +0000
+++ openerp/sql_db.py	2014-04-09 13:52:38 +0000
@@ -347,6 +347,23 @@
         """
         return self._cnx.rollback()
 
+    def __enter__(self):
+        """ Using the cursor as a contextmanager automatically commits and
+            closes it::
+
+                with cr:
+                    cr.execute(...)
+
+                # cr is committed if no failure occurred
+                # cr is closed in any case
+        """
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if exc_type is None:
+            self.commit()
+        self.close()
+
     @contextmanager
     @check
     def savepoint(self):
@@ -364,6 +381,41 @@
     def __getattr__(self, name):
         return getattr(self._obj, name)
 
+class TestCursor(Cursor):
+    """ A cursor to be used for tests. It keeps the transaction open across
+        several requests, and simulates committing, rolling back, and closing.
+    """
+    def __init__(self, *args, **kwargs):
+        # in order to simulate commit and rollback, the cursor maintains a
+        # savepoint at its last commit
+        super(TestCursor, self).__init__(*args, **kwargs)
+        self.execute("SAVEPOINT test_cursor")
+        self._lock = threading.RLock()
+
+    def acquire(self):
+        self._lock.acquire()
+
+    def release(self):
+        self._lock.release()
+
+    def close(self, force=False):
+        if force:
+            super(TestCursor, self).close()
+        elif not self._closed:
+            self.rollback()             # for stuff that has not been committed
+            self.release()
+
+    def autocommit(self, on):
+        _logger.debug("TestCursor.autocommit(%r) does nothing", on)
+
+    def commit(self):
+        self.execute("RELEASE SAVEPOINT test_cursor")
+        self.execute("SAVEPOINT test_cursor")
+
+    def rollback(self):
+        self.execute("ROLLBACK TO SAVEPOINT test_cursor")
+        self.execute("SAVEPOINT test_cursor")
+
 class PsycoConnection(psycopg2.extensions.connection):
     pass
 
@@ -491,6 +543,11 @@
         _logger.debug('create %scursor to %r', cursor_type, self.dbname)
         return Cursor(self._pool, self.dbname, serialized=serialized)
 
+    def test_cursor(self, serialized=True):
+        cursor_type = serialized and 'serialized ' or ''
+        _logger.debug('create test %scursor to %r', cursor_type, self.dbname)
+        return TestCursor(self._pool, self.dbname, serialized=serialized)
+
     # serialized_cursor is deprecated - cursors are serialized by default
     serialized_cursor = cursor
 

=== modified file 'openerp/tests/common.py'
--- openerp/tests/common.py	2014-04-03 13:41:09 +0000
+++ openerp/tests/common.py	2014-04-09 13:52:38 +0000
@@ -20,6 +20,7 @@
 import werkzeug
 
 import openerp
+from openerp.modules.registry import RegistryManager
 
 _logger = logging.getLogger(__name__)
 
@@ -37,25 +38,6 @@
 # Useless constant, tests are aware of the content of demo data
 ADMIN_USER_ID = openerp.SUPERUSER_ID
 
-# Magic session_id, unfortunately we have to serialize access to the cursors to
-# serialize requests. We first tried to duplicate the database for each tests
-# but this proved too slow. Any idea to improve this is welcome.
-HTTP_SESSION = {}
-
-def acquire_test_cursor(session_id):
-    if openerp.tools.config['test_enable']:
-        cr = HTTP_SESSION.get(session_id)
-        if cr:
-            cr._test_lock.acquire()
-            return cr
-
-def release_test_cursor(cr):
-    if openerp.tools.config['test_enable']:
-        if hasattr(cr, '_test_lock'):
-            cr._test_lock.release()
-            return True
-    return False
-
 def at_install(flag):
     """ Sets the at-install state of a test, the flag is a boolean specifying
     whether the test should (``True``) or should not (``False``) run during
@@ -67,6 +49,7 @@
         obj.at_install = flag
         return obj
     return decorator
+
 def post_install(flag):
     """ Sets the post-install state of a test. The flag is a boolean
     specifying whether the test should or should not run after a set of
@@ -83,18 +66,13 @@
     """
     Subclass of TestCase for common OpenERP-specific code.
     
-    This class is abstract and expects self.cr and self.uid to be initialized by subclasses.
+    This class is abstract and expects self.registry, self.cr and self.uid to be
+    initialized by subclasses.
     """
 
-    @classmethod
     def cursor(self):
-        return openerp.modules.registry.RegistryManager.get(DB).db.cursor()
-
-    @classmethod
-    def registry(self, model):
-        return openerp.modules.registry.RegistryManager.get(DB)[model]
-
-    @classmethod
+        return self.registry.cursor()
+
     def ref(self, xid):
         """ Returns database ID corresponding to a given identifier.
 
@@ -106,7 +84,6 @@
         _, id = self.registry('ir.model.data').get_object_reference(self.cr, self.uid, module, xid)
         return id
 
-    @classmethod
     def browse_ref(self, xid):
         """ Returns a browsable record for the given identifier.
 
@@ -125,10 +102,9 @@
     """
 
     def setUp(self):
-        # Store cr and uid in class variables, to allow ref() and browse_ref to be BaseCase @classmethods
-        # and still access them
-        TransactionCase.cr = self.cursor()
-        TransactionCase.uid = openerp.SUPERUSER_ID
+        self.registry = RegistryManager.get(DB)
+        self.cr = self.cursor()
+        self.uid = openerp.SUPERUSER_ID
 
     def tearDown(self):
         self.cr.rollback()
@@ -143,7 +119,8 @@
 
     @classmethod
     def setUpClass(cls):
-        cls.cr = cls.cursor()
+        cls.registry = RegistryManager.get(DB)
+        cls.cr = cls.registry.cursor()
         cls.uid = openerp.SUPERUSER_ID
 
     @classmethod
@@ -166,16 +143,15 @@
 
     def setUp(self):
         super(HttpCase, self).setUp()
+        self.registry.enter_test_mode()
         # setup a magic session_id that will be rollbacked
         self.session = openerp.http.root.session_store.new()
         self.session_id = self.session.sid
         self.session.db = DB
         openerp.http.root.session_store.save(self.session)
-        self.cr._test_lock = threading.RLock()
-        HTTP_SESSION[self.session_id] = self.cr
 
     def tearDown(self):
-        del HTTP_SESSION[self.session_id]
+        self.registry.leave_test_mode()
         super(HttpCase, self).tearDown()
 
     def url_open(self, url, data=None, timeout=10):

=== modified file 'openerp/tools/mail.py'
--- openerp/tools/mail.py	2014-02-19 14:06:17 +0000
+++ openerp/tools/mail.py	2014-04-09 13:52:38 +0000
@@ -625,7 +625,7 @@
     if not cr:
         db_name = getattr(threading.currentThread(), 'dbname', None)
         if db_name:
-            local_cr = cr = openerp.registry(db_name).db.cursor()
+            local_cr = cr = openerp.registry(db_name).cursor()
         else:
             raise Exception("No database cursor found, please pass one explicitly")
 

=== modified file 'openerpcommand/module.py'
--- openerpcommand/module.py	2013-01-11 13:46:57 +0000
+++ openerpcommand/module.py	2014-04-09 13:52:38 +0000
@@ -33,12 +33,9 @@
  
         xs = []
         ir_module_module = registry.get('ir.module.module')
-        cr = registry.db.cursor() # TODO context manager
-        try:
+        with registry.cursor() as cr:
             ids = ir_module_module.search(cr, openerp.SUPERUSER_ID, [], {})
             xs = ir_module_module.read(cr, openerp.SUPERUSER_ID, ids, [], {})
-        finally:
-            cr.close()
  
         if xs:
             print "Modules (database `%s`):" % (args.database,)

=== modified file 'openerpcommand/read.py'
--- openerpcommand/read.py	2013-03-29 14:07:23 +0000
+++ openerpcommand/read.py	2014-04-09 13:52:38 +0000
@@ -20,15 +20,12 @@
     registry = openerp.modules.registry.RegistryManager.get(
         args.database, update_module=False)
     model = registry[args.model]
-    cr = registry.db.cursor() # TODO context manager
     field_names = [args.field] if args.field else []
     if args.short:
         # ignore --field
         field_names = ['name']
-    try:
+    with registry.cursor() as cr:
         xs = model.read(cr, 1, args.id, field_names, {})
-    finally:
-        cr.close()
 
     if xs:
         print "Records (model `%s`, database `%s`):" % (args.model, args.database)

=== modified file 'openerpcommand/uninstall.py'
--- openerpcommand/uninstall.py	2013-02-09 06:02:46 +0000
+++ openerpcommand/uninstall.py	2014-04-09 13:52:38 +0000
@@ -43,15 +43,12 @@
         args.database, update_module=False)
 
     ir_module_module = registry.get('ir.module.module')
-    cr = registry.db.cursor() # TODO context manager
-    try:
+    with registry.cursor() as cr:
         ids = ir_module_module.search(cr, openerp.SUPERUSER_ID, [('name', 'in', args.module), ('state', '=', 'installed')], {})
         if len(ids) == len(args.module):
             ir_module_module.button_immediate_uninstall(cr, openerp.SUPERUSER_ID, ids, {})
         else:
             print "At least one module not found (database `%s`)." % (args.database,)
-    finally:
-        cr.close()
 
 def add_parser(subparsers):
     parser = subparsers.add_parser('uninstall',